/*-------------------------------------------------------------------------
 * Vulkan Conformance Tests
 * ------------------------
 *
 * Copyright (c) 2015 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *//*!
 * \file
 * \brief Binding shader access tests
 *//*--------------------------------------------------------------------*/

#include "vktBindingShaderAccessTests.hpp"

#include "vktTestCase.hpp"

#include "vkDefs.hpp"
#include "vkRef.hpp"
#include "vkRefUtil.hpp"
#include "vkPlatform.hpp"
#include "vkPrograms.hpp"
#include "vkMemUtil.hpp"
#include "vkBuilderUtil.hpp"
#include "vkQueryUtil.hpp"
#include "vkImageUtil.hpp"
#include "vkTypeUtil.hpp"
#include "vkCmdUtil.hpp"
#include "vkObjUtil.hpp"

#include "tcuVector.hpp"
#include "tcuVectorUtil.hpp"
#include "tcuTexture.hpp"
#include "tcuTextureUtil.hpp"
#include "tcuResultCollector.hpp"
#include "tcuTestLog.hpp"
#include "tcuRGBA.hpp"
#include "tcuSurface.hpp"
#include "tcuImageCompare.hpp"

#include "deUniquePtr.hpp"
#include "deSharedPtr.hpp"
#include "deStringUtil.hpp"
#include "deArrayUtil.hpp"

#include "qpInfo.h"
#include <iostream>

namespace vkt
{
namespace BindingModel
{
namespace
{

enum ResourceFlag
{
	RESOURCE_FLAG_IMMUTABLE_SAMPLER = (1u << 0u),

	RESOURCE_FLAG_LAST				= (1u << 1u)
};

enum DescriptorUpdateMethod
{
	DESCRIPTOR_UPDATE_METHOD_NORMAL = 0,			//!< use vkUpdateDescriptorSets
	DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE,			//!< use descriptor update templates
	DESCRIPTOR_UPDATE_METHOD_WITH_PUSH,				//!< use push descriptor updates
	DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE,	//!< use push descriptor update templates

	DESCRIPTOR_UPDATE_METHOD_LAST
};

std::string stringifyDescriptorUpdateMethod(DescriptorUpdateMethod method)
{
	switch (method)
	{
		case DESCRIPTOR_UPDATE_METHOD_NORMAL:
			return "";
			break;

		case DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE:
			return "with_template";
			break;

		case DESCRIPTOR_UPDATE_METHOD_WITH_PUSH:
			return "with_push";
			break;

		case DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE:
			return "with_push_template";
			break;

		default:
			return "N/A";
			break;
	}
}

static const char* const s_quadrantGenVertexPosSource =	"	highp int quadPhase = gl_VertexIndex % 6;\n"
														"	highp int quadXcoord = int(quadPhase == 1 || quadPhase == 4 || quadPhase == 5);\n"
														"	highp int quadYcoord = int(quadPhase == 2 || quadPhase == 3 || quadPhase == 5);\n"
														"	highp int quadOriginX = (gl_VertexIndex / 6) % 2;\n"
														"	highp int quadOriginY = (gl_VertexIndex / 6) / 2;\n"
														"	quadrant_id = gl_VertexIndex / 6;\n"
														"	result_position = vec4(float(quadOriginX + quadXcoord - 1), float(quadOriginY + quadYcoord - 1), 0.0, 1.0);\n";

std::string genPerVertexBlock (const vk::VkShaderStageFlagBits stage, const glu::GLSLVersion version)
{
	static const char* const block = "gl_PerVertex {\n"
									 "    vec4  gl_Position;\n"
									 "    float gl_PointSize;\n"	// not used, but for compatibility with how implicit block is declared in ES
									 "}";
	std::ostringstream str;

	if (!glu::glslVersionIsES(version))
		switch (stage)
		{
			case vk::VK_SHADER_STAGE_VERTEX_BIT:
				str << "out " << block << ";\n";
				break;

			case vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT:
				str << "in " << block << " gl_in[gl_MaxPatchVertices];\n"
					<< "out " << block << " gl_out[];\n";
				break;

			case vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT:
				str << "in " << block << " gl_in[gl_MaxPatchVertices];\n"
					<< "out " << block << ";\n";
				break;

			case vk::VK_SHADER_STAGE_GEOMETRY_BIT:
				str << "in " << block << " gl_in[];\n"
					<< "out " << block << ";\n";
				break;

			default:
				break;
		}

	return str.str();
}

bool isUniformDescriptorType (vk::VkDescriptorType type)
{
	return type == vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER ||
		   type == vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC ||
		   type == vk::VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER;
}

bool isDynamicDescriptorType (vk::VkDescriptorType type)
{
	return type == vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC || type == vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC;
}

void verifyDriverSupport(const deUint32							apiVersion,
						 const vk::VkPhysicalDeviceFeatures&	deviceFeatures,
						 const std::vector<std::string>&		deviceExtensions,
						 DescriptorUpdateMethod					updateMethod,
						 vk::VkDescriptorType					descType,
						 vk::VkShaderStageFlags					activeStages,
						 vk::VkImageViewType					viewType = vk::VK_IMAGE_VIEW_TYPE_2D)
{
	std::vector<std::string>	extensionNames;
	size_t						numExtensionsNeeded = 0;

	switch (updateMethod)
	{
		case DESCRIPTOR_UPDATE_METHOD_WITH_PUSH:
			extensionNames.push_back("VK_KHR_push_descriptor");
			break;

		case DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE:
			extensionNames.push_back("VK_KHR_push_descriptor");
		// Fallthrough
		case DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE:
			if (!vk::isCoreDeviceExtension(apiVersion, "VK_KHR_descriptor_update_template"))
				extensionNames.push_back("VK_KHR_descriptor_update_template");
			break;

		case DESCRIPTOR_UPDATE_METHOD_NORMAL:
			// no extensions needed
			break;

		default:
			DE_FATAL("Impossible");
	}

	numExtensionsNeeded = extensionNames.size();

	if (numExtensionsNeeded > 0)
	{
		for (size_t deviceExtNdx = 0; deviceExtNdx < deviceExtensions.size(); deviceExtNdx++)
		{
			for (size_t requiredExtNdx = 0; requiredExtNdx < extensionNames.size(); requiredExtNdx++)
			{
				if (deStringEqual(deviceExtensions[deviceExtNdx].c_str(), extensionNames[requiredExtNdx].c_str()))
				{
					--numExtensionsNeeded;
					break;
				}
			}

			if (numExtensionsNeeded == 0)
				break;
		}

		if (numExtensionsNeeded > 0)
		{
			TCU_THROW(NotSupportedError, (stringifyDescriptorUpdateMethod(updateMethod) + " tests are not supported").c_str());
		}
	}

	switch (descType)
	{
		case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
		case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
		case vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
		case vk::VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER:
		case vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER:
		case vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC:
			// These are supported in all stages
			break;

		case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
		case vk::VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER:
		case vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER:
		case vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC:
			if (activeStages & (vk::VK_SHADER_STAGE_VERTEX_BIT |
								vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT |
								vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT |
								vk::VK_SHADER_STAGE_GEOMETRY_BIT))
			{
				if (!deviceFeatures.vertexPipelineStoresAndAtomics)
					TCU_THROW(NotSupportedError, (de::toString(descType) + " is not supported in the vertex pipeline").c_str());
			}

			if (activeStages & vk::VK_SHADER_STAGE_FRAGMENT_BIT)
			{
				if (!deviceFeatures.fragmentStoresAndAtomics)
					TCU_THROW(NotSupportedError, (de::toString(descType) + " is not supported in fragment shaders").c_str());
			}
			break;

		default:
			DE_FATAL("Impossible");
	}

	if (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY && !deviceFeatures.imageCubeArray)
		TCU_THROW(NotSupportedError, "imageCubeArray feature not supported");
}

vk::VkImageType viewTypeToImageType (vk::VkImageViewType type)
{
	switch (type)
	{
		case vk::VK_IMAGE_VIEW_TYPE_1D:
		case vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY:	return vk::VK_IMAGE_TYPE_1D;
		case vk::VK_IMAGE_VIEW_TYPE_2D:
		case vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY:	return vk::VK_IMAGE_TYPE_2D;
		case vk::VK_IMAGE_VIEW_TYPE_3D:			return vk::VK_IMAGE_TYPE_3D;
		case vk::VK_IMAGE_VIEW_TYPE_CUBE:
		case vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY:	return vk::VK_IMAGE_TYPE_2D;

		default:
			DE_FATAL("Impossible");
			return (vk::VkImageType)0;
	}
}

vk::VkImageLayout getImageLayoutForDescriptorType (vk::VkDescriptorType descType)
{
	if (descType == vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE)
		return vk::VK_IMAGE_LAYOUT_GENERAL;
	else
		return vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
}

deUint32 getTextureLevelPyramidDataSize (const tcu::TextureLevelPyramid& srcImage)
{
	deUint32 dataSize = 0;
	for (int level = 0; level < srcImage.getNumLevels(); ++level)
	{
		const tcu::ConstPixelBufferAccess srcAccess = srcImage.getLevel(level);

		// tightly packed
		DE_ASSERT(srcAccess.getFormat().getPixelSize() == srcAccess.getPixelPitch());

		dataSize += srcAccess.getWidth() * srcAccess.getHeight() * srcAccess.getDepth() * srcAccess.getFormat().getPixelSize();
	}
	return dataSize;
}

void writeTextureLevelPyramidData (void* dst, deUint32 dstLen, const tcu::TextureLevelPyramid& srcImage, vk::VkImageViewType viewType, std::vector<vk::VkBufferImageCopy>* copySlices)
{
	// \note cube is copied face-by-face
	const deUint32	arraySize	= (viewType == vk::VK_IMAGE_VIEW_TYPE_1D || viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)		? (srcImage.getLevel(0).getHeight()) :
								  (viewType == vk::VK_IMAGE_VIEW_TYPE_2D || viewType == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY)		? (srcImage.getLevel(0).getDepth()) :
								  (viewType == vk::VK_IMAGE_VIEW_TYPE_3D)														? (1) :
								  (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE || viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)	? (srcImage.getLevel(0).getDepth()) :
								  ((deUint32)0);
	deUint32		levelOffset	= 0;

	DE_ASSERT(arraySize != 0);

	for (int level = 0; level < srcImage.getNumLevels(); ++level)
	{
		const tcu::ConstPixelBufferAccess	srcAccess		= srcImage.getLevel(level);
		const tcu::PixelBufferAccess		dstAccess		(srcAccess.getFormat(), srcAccess.getSize(), srcAccess.getPitch(), (deUint8*)dst + levelOffset);
		const deUint32						dataSize		= srcAccess.getWidth() * srcAccess.getHeight() * srcAccess.getDepth() * srcAccess.getFormat().getPixelSize();
		const deUint32						sliceDataSize	= dataSize / arraySize;
		const deInt32						sliceHeight		= (viewType == vk::VK_IMAGE_VIEW_TYPE_1D || viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY) ? (1) : (srcAccess.getHeight());
		const deInt32						sliceDepth		= (viewType == vk::VK_IMAGE_VIEW_TYPE_3D) ? (srcAccess.getDepth()) : (1);
		const tcu::IVec3					sliceSize		(srcAccess.getWidth(), sliceHeight, sliceDepth);

		// tightly packed
		DE_ASSERT(srcAccess.getFormat().getPixelSize() == srcAccess.getPixelPitch());

		for (int sliceNdx = 0; sliceNdx < (int)arraySize; ++sliceNdx)
		{
			const vk::VkBufferImageCopy copySlice =
			{
				(vk::VkDeviceSize)levelOffset + sliceNdx * sliceDataSize,	// bufferOffset
				(deUint32)sliceSize.x(),									// bufferRowLength
				(deUint32)sliceSize.y(),									// bufferImageHeight
				{
					vk::VK_IMAGE_ASPECT_COLOR_BIT,		// aspectMask
					(deUint32)level,					// mipLevel
					(deUint32)sliceNdx,					// arrayLayer
					1u,									// arraySize
				},															// imageSubresource
				{
					0,
					0,
					0,
				},															// imageOffset
				{
					(deUint32)sliceSize.x(),
					(deUint32)sliceSize.y(),
					(deUint32)sliceSize.z(),
				}															// imageExtent
			};
			copySlices->push_back(copySlice);
		}

		DE_ASSERT(arraySize * sliceDataSize == dataSize);

		tcu::copy(dstAccess, srcAccess);
		levelOffset += dataSize;
	}

	DE_ASSERT(dstLen == levelOffset);
	DE_UNREF(dstLen);
}

de::MovePtr<vk::Allocation> allocateAndBindObjectMemory (const vk::DeviceInterface& vki, vk::VkDevice device, vk::Allocator& allocator, vk::VkBuffer buffer, vk::MemoryRequirement requirement)
{
	const vk::VkMemoryRequirements	requirements	= vk::getBufferMemoryRequirements(vki, device, buffer);
	de::MovePtr<vk::Allocation>		allocation		= allocator.allocate(requirements, requirement);

	VK_CHECK(vki.bindBufferMemory(device, buffer, allocation->getMemory(), allocation->getOffset()));
	return allocation;
}

de::MovePtr<vk::Allocation> allocateAndBindObjectMemory (const vk::DeviceInterface& vki, vk::VkDevice device, vk::Allocator& allocator, vk::VkImage image, vk::MemoryRequirement requirement)
{
	const vk::VkMemoryRequirements	requirements	= vk::getImageMemoryRequirements(vki, device, image);
	de::MovePtr<vk::Allocation>		allocation		= allocator.allocate(requirements, requirement);

	VK_CHECK(vki.bindImageMemory(device, image, allocation->getMemory(), allocation->getOffset()));
	return allocation;
}

vk::VkDescriptorImageInfo makeDescriptorImageInfo (vk::VkSampler sampler)
{
	return vk::makeDescriptorImageInfo(sampler, (vk::VkImageView)0, (vk::VkImageLayout)0);
}

vk::VkDescriptorImageInfo makeDescriptorImageInfo (vk::VkImageView imageView, vk::VkImageLayout layout)
{
	return vk::makeDescriptorImageInfo((vk::VkSampler)0, imageView, layout);
}

void drawQuadrantReferenceResult (const tcu::PixelBufferAccess& dst, const tcu::Vec4& c1, const tcu::Vec4& c2, const tcu::Vec4& c3, const tcu::Vec4& c4)
{
	tcu::clear(tcu::getSubregion(dst, 0,					0,						dst.getWidth() / 2,						dst.getHeight() / 2),					c1);
	tcu::clear(tcu::getSubregion(dst, dst.getWidth() / 2,	0,						dst.getWidth() - dst.getWidth() / 2,	dst.getHeight() / 2),					c2);
	tcu::clear(tcu::getSubregion(dst, 0,					dst.getHeight() / 2,	dst.getWidth() / 2,						dst.getHeight() - dst.getHeight() / 2),	c3);
	tcu::clear(tcu::getSubregion(dst, dst.getWidth() / 2,	dst.getHeight() / 2,	dst.getWidth() - dst.getWidth() / 2,	dst.getHeight() - dst.getHeight() / 2),	c4);
}

static const vk::VkDescriptorUpdateTemplateEntry createTemplateBinding (deUint32 binding, deUint32 arrayElement, deUint32 descriptorCount, vk::VkDescriptorType descriptorType, size_t offset, size_t stride)
{
	const vk::VkDescriptorUpdateTemplateEntry updateBinding =
	{
		binding,
		arrayElement,
		descriptorCount,
		descriptorType,
		offset,
		stride
	};

	return updateBinding;
}

class RawUpdateRegistry
{
public:
							RawUpdateRegistry		(void);

	template<typename Type>
	void					addWriteObject			(const Type& updateObject);
	size_t					getWriteObjectOffset	(const deUint32 objectId);
	const deUint8*			getRawPointer			() const;

private:

	std::vector<deUint8>	m_updateEntries;
	std::vector<size_t>		m_updateEntryOffsets;
	size_t					m_nextOffset;
};

RawUpdateRegistry::RawUpdateRegistry (void)
	: m_updateEntries()
	, m_updateEntryOffsets()
	, m_nextOffset(0)
{
}

template<typename Type>
void RawUpdateRegistry::addWriteObject (const Type& updateObject)
{
	m_updateEntryOffsets.push_back(m_nextOffset);

	// in this case, elements <=> bytes
	m_updateEntries.resize(m_nextOffset + sizeof(updateObject));
	Type* t = reinterpret_cast<Type*>(m_updateEntries.data() + m_nextOffset);
	*t = updateObject;
	m_nextOffset += sizeof(updateObject);
}

size_t RawUpdateRegistry::getWriteObjectOffset (const deUint32 objectId)
{
	return m_updateEntryOffsets[objectId];
}

const deUint8* RawUpdateRegistry::getRawPointer () const
{
	return m_updateEntries.data();
}

class SingleTargetRenderInstance : public vkt::TestInstance
{
public:
											SingleTargetRenderInstance	(Context&						context,
																		 const tcu::UVec2&				size);

private:
	static vk::Move<vk::VkImage>			createColorAttachment		(const vk::DeviceInterface&		vki,
																		 vk::VkDevice					device,
																		 vk::Allocator&					allocator,
																		 const tcu::TextureFormat&		format,
																		 const tcu::UVec2&				size,
																		 de::MovePtr<vk::Allocation>*	outAllocation);

	static vk::Move<vk::VkImageView>		createColorAttachmentView	(const vk::DeviceInterface&	vki,
																		 vk::VkDevice				device,
																		 const tcu::TextureFormat&	format,
																		 vk::VkImage				image);

	static vk::Move<vk::VkFramebuffer>		createFramebuffer			(const vk::DeviceInterface&	vki,
																		 vk::VkDevice				device,
																		 vk::VkRenderPass			renderpass,
																		 vk::VkImageView			colorAttachmentView,
																		 const tcu::UVec2&			size);

	static vk::Move<vk::VkCommandPool>		createCommandPool			(const vk::DeviceInterface&	vki,
																		 vk::VkDevice				device,
																		 deUint32					queueFamilyIndex);

	virtual void							logTestPlan					(void) const = 0;
	virtual void							renderToTarget				(void) = 0;
	virtual tcu::TestStatus					verifyResultImage			(const tcu::ConstPixelBufferAccess& result) const = 0;

	void									readRenderTarget			(tcu::TextureLevel& dst);
	tcu::TestStatus							iterate						(void);

protected:
	const tcu::TextureFormat				m_targetFormat;
	const tcu::UVec2						m_targetSize;

	const vk::DeviceInterface&				m_vki;
	const vk::VkDevice						m_device;
	const vk::VkQueue						m_queue;
	const deUint32							m_queueFamilyIndex;
	vk::Allocator&							m_allocator;
	de::MovePtr<vk::Allocation>				m_colorAttachmentMemory;
	const vk::Unique<vk::VkImage>			m_colorAttachmentImage;
	const vk::Unique<vk::VkImageView>		m_colorAttachmentView;
	const vk::Unique<vk::VkRenderPass>		m_renderPass;
	const vk::Unique<vk::VkFramebuffer>		m_framebuffer;
	const vk::Unique<vk::VkCommandPool>		m_cmdPool;

	bool									m_firstIteration;
};

SingleTargetRenderInstance::SingleTargetRenderInstance (Context&							context,
														const tcu::UVec2&					size)
	: vkt::TestInstance			(context)
	, m_targetFormat			(tcu::TextureFormat::RGBA, tcu::TextureFormat::UNORM_INT8)
	, m_targetSize				(size)
	, m_vki						(context.getDeviceInterface())
	, m_device					(context.getDevice())
	, m_queue					(context.getUniversalQueue())
	, m_queueFamilyIndex		(context.getUniversalQueueFamilyIndex())
	, m_allocator				(context.getDefaultAllocator())
	, m_colorAttachmentMemory	(DE_NULL)
	, m_colorAttachmentImage	(createColorAttachment(m_vki, m_device, m_allocator, m_targetFormat, m_targetSize, &m_colorAttachmentMemory))
	, m_colorAttachmentView		(createColorAttachmentView(m_vki, m_device, m_targetFormat, *m_colorAttachmentImage))
	, m_renderPass				(makeRenderPass(m_vki, m_device, vk::mapTextureFormat(m_targetFormat)))
	, m_framebuffer				(createFramebuffer(m_vki, m_device, *m_renderPass, *m_colorAttachmentView, m_targetSize))
	, m_cmdPool					(createCommandPool(m_vki, m_device, context.getUniversalQueueFamilyIndex()))
	, m_firstIteration			(true)
{
}

vk::Move<vk::VkImage> SingleTargetRenderInstance::createColorAttachment (const vk::DeviceInterface&		vki,
																		 vk::VkDevice					device,
																		 vk::Allocator&					allocator,
																		 const tcu::TextureFormat&		format,
																		 const tcu::UVec2&				size,
																		 de::MovePtr<vk::Allocation>*	outAllocation)
{
	const vk::VkImageCreateInfo	imageInfo	=
	{
		vk::VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
		DE_NULL,
		(vk::VkImageCreateFlags)0,
		vk::VK_IMAGE_TYPE_2D,							// imageType
		vk::mapTextureFormat(format),					// format
		{ size.x(), size.y(), 1u },						// extent
		1,												// mipLevels
		1,												// arraySize
		vk::VK_SAMPLE_COUNT_1_BIT,						// samples
		vk::VK_IMAGE_TILING_OPTIMAL,					// tiling
		vk::VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | vk::VK_IMAGE_USAGE_TRANSFER_SRC_BIT,	// usage
		vk::VK_SHARING_MODE_EXCLUSIVE,					// sharingMode
		0u,												// queueFamilyCount
		DE_NULL,										// pQueueFamilyIndices
		vk::VK_IMAGE_LAYOUT_UNDEFINED,					// initialLayout
	};

	vk::Move<vk::VkImage>		image		(vk::createImage(vki, device, &imageInfo));
	de::MovePtr<vk::Allocation>	allocation	(allocateAndBindObjectMemory(vki, device, allocator, *image, vk::MemoryRequirement::Any));

	*outAllocation = allocation;
	return image;
}

vk::Move<vk::VkImageView> SingleTargetRenderInstance::createColorAttachmentView (const vk::DeviceInterface&	vki,
																				 vk::VkDevice				device,
																				 const tcu::TextureFormat&	format,
																				 vk::VkImage				image)
{
	const vk::VkImageViewCreateInfo createInfo =
	{
		vk::VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
		DE_NULL,
		(vk::VkImageViewCreateFlags)0,
		image,							// image
		vk::VK_IMAGE_VIEW_TYPE_2D,		// viewType
		vk::mapTextureFormat(format),	// format
		vk::makeComponentMappingRGBA(),
		{
			vk::VK_IMAGE_ASPECT_COLOR_BIT,	// aspectMask
			0u,								// baseMipLevel
			1u,								// mipLevels
			0u,								// baseArrayLayer
			1u,								// arraySize
		},
	};

	return vk::createImageView(vki, device, &createInfo);
}

vk::Move<vk::VkFramebuffer> SingleTargetRenderInstance::createFramebuffer (const vk::DeviceInterface&	vki,
																		   vk::VkDevice					device,
																		   vk::VkRenderPass				renderpass,
																		   vk::VkImageView				colorAttachmentView,
																		   const tcu::UVec2&			size)
{
	const vk::VkFramebufferCreateInfo	framebufferCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,
		DE_NULL,
		(vk::VkFramebufferCreateFlags)0,
		renderpass,				// renderPass
		1u,						// attachmentCount
		&colorAttachmentView,	// pAttachments
		size.x(),				// width
		size.y(),				// height
		1,						// layers
	};

	return vk::createFramebuffer(vki, device, &framebufferCreateInfo);
}

vk::Move<vk::VkCommandPool> SingleTargetRenderInstance::createCommandPool (const vk::DeviceInterface&	vki,
																		   vk::VkDevice					device,
																		   deUint32						queueFamilyIndex)
{
	return vk::createCommandPool(vki, device, vk::VK_COMMAND_POOL_CREATE_TRANSIENT_BIT, queueFamilyIndex);
}

void SingleTargetRenderInstance::readRenderTarget (tcu::TextureLevel& dst)
{
	const deUint64							pixelDataSize				= (deUint64)(m_targetSize.x() * m_targetSize.y() * m_targetFormat.getPixelSize());
	const vk::VkBufferCreateInfo			bufferCreateInfo			=
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
		DE_NULL,
		0u,												// flags
		pixelDataSize,									// size
		vk::VK_BUFFER_USAGE_TRANSFER_DST_BIT,			// usage
		vk::VK_SHARING_MODE_EXCLUSIVE,					// sharingMode
		0u,												// queueFamilyCount
		DE_NULL,										// pQueueFamilyIndices
	};
	const vk::Unique<vk::VkBuffer>			buffer						(vk::createBuffer(m_vki, m_device, &bufferCreateInfo));

	const de::MovePtr<vk::Allocation>		bufferMemory				= allocateAndBindObjectMemory(m_vki, m_device, m_allocator, *buffer, vk::MemoryRequirement::HostVisible);

	const vk::Unique<vk::VkCommandBuffer>	cmd							(vk::allocateCommandBuffer(m_vki, m_device, *m_cmdPool, vk::VK_COMMAND_BUFFER_LEVEL_PRIMARY));

	// copy content to buffer
	beginCommandBuffer(m_vki, *cmd);
	copyImageToBuffer(m_vki, *cmd, *m_colorAttachmentImage, *buffer, tcu::IVec2(m_targetSize.x(), m_targetSize.y()));
	endCommandBuffer(m_vki, *cmd);

	submitCommandsAndWait(m_vki, m_device, m_queue, cmd.get());

	dst.setStorage(m_targetFormat, m_targetSize.x(), m_targetSize.y());

	// copy data
	invalidateAlloc(m_vki, m_device, *bufferMemory);
	tcu::copy(dst, tcu::ConstPixelBufferAccess(dst.getFormat(), dst.getSize(), bufferMemory->getHostPtr()));
}

tcu::TestStatus SingleTargetRenderInstance::iterate (void)
{
	tcu::TextureLevel resultImage;

	// log
	if (m_firstIteration)
	{
		logTestPlan();
		m_firstIteration = false;
	}

	// render
	{
		// transition to VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL
		const vk::VkImageSubresourceRange		fullSubrange				=
		{
			vk::VK_IMAGE_ASPECT_COLOR_BIT,					// aspectMask
			0u,												// baseMipLevel
			1u,												// mipLevels
			0u,												// baseArraySlice
			1u,												// arraySize
		};
		const vk::VkImageMemoryBarrier			imageBarrier				=
		{
			vk::VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,
			DE_NULL,
			0u,												// srcAccessMask
			vk::VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,		// dstAccessMask
			vk::VK_IMAGE_LAYOUT_UNDEFINED,					// oldLayout
			vk::VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL,	// newLayout
			VK_QUEUE_FAMILY_IGNORED,						// srcQueueFamilyIndex
			VK_QUEUE_FAMILY_IGNORED,						// destQueueFamilyIndex
			*m_colorAttachmentImage,						// image
			fullSubrange,									// subresourceRange
		};

		const vk::Unique<vk::VkCommandBuffer>	cmd					(vk::allocateCommandBuffer(m_vki, m_device, *m_cmdPool, vk::VK_COMMAND_BUFFER_LEVEL_PRIMARY));

		beginCommandBuffer(m_vki, *cmd);
		m_vki.cmdPipelineBarrier(*cmd, vk::VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, vk::VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT, (vk::VkDependencyFlags)0,
								 0, (const vk::VkMemoryBarrier*)DE_NULL,
								 0, (const vk::VkBufferMemoryBarrier*)DE_NULL,
								 1, &imageBarrier);
		endCommandBuffer(m_vki, *cmd);

		submitCommandsAndWait(m_vki, m_device, m_queue, cmd.get());

		renderToTarget();
	}

	// read and verify
	readRenderTarget(resultImage);
	return verifyResultImage(resultImage.getAccess());
}

class RenderInstanceShaders
{
public:
														RenderInstanceShaders		(const vk::DeviceInterface&				vki,
																					 vk::VkDevice							device,
																					 const vk::VkPhysicalDeviceFeatures&	deviceFeatures,
																					 const vk::BinaryCollection&			programCollection);

	inline bool											hasTessellationStage		(void) const { return *m_tessCtrlShaderModule != 0 || *m_tessEvalShaderModule != 0;	}
	inline deUint32										getNumStages				(void) const { return (deUint32)m_stageInfos.size();								}
	inline const vk::VkPipelineShaderStageCreateInfo*	getStages					(void) const { return &m_stageInfos[0];												}

private:
	void												addStage					(const vk::DeviceInterface&				vki,
																					 vk::VkDevice							device,
																					 const vk::VkPhysicalDeviceFeatures&	deviceFeatures,
																					 const vk::BinaryCollection&			programCollection,
																					 const char*							name,
																					 vk::VkShaderStageFlagBits				stage,
																					 vk::Move<vk::VkShaderModule>*			outModule);

	vk::VkPipelineShaderStageCreateInfo					getShaderStageCreateInfo	(vk::VkShaderStageFlagBits stage, vk::VkShaderModule shader) const;

	vk::Move<vk::VkShaderModule>						m_vertexShaderModule;
	vk::Move<vk::VkShaderModule>						m_tessCtrlShaderModule;
	vk::Move<vk::VkShaderModule>						m_tessEvalShaderModule;
	vk::Move<vk::VkShaderModule>						m_geometryShaderModule;
	vk::Move<vk::VkShaderModule>						m_fragmentShaderModule;
	std::vector<vk::VkPipelineShaderStageCreateInfo>	m_stageInfos;
};

RenderInstanceShaders::RenderInstanceShaders (const vk::DeviceInterface&			vki,
											  vk::VkDevice							device,
											  const vk::VkPhysicalDeviceFeatures&	deviceFeatures,
											  const vk::BinaryCollection&			programCollection)
{
	addStage(vki, device, deviceFeatures, programCollection, "vertex",		vk::VK_SHADER_STAGE_VERTEX_BIT,						&m_vertexShaderModule);
	addStage(vki, device, deviceFeatures, programCollection, "tess_ctrl",	vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT,		&m_tessCtrlShaderModule);
	addStage(vki, device, deviceFeatures, programCollection, "tess_eval",	vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT,	&m_tessEvalShaderModule);
	addStage(vki, device, deviceFeatures, programCollection, "geometry",	vk::VK_SHADER_STAGE_GEOMETRY_BIT,					&m_geometryShaderModule);
	addStage(vki, device, deviceFeatures, programCollection, "fragment",	vk::VK_SHADER_STAGE_FRAGMENT_BIT,					&m_fragmentShaderModule);

	DE_ASSERT(!m_stageInfos.empty());
}

void RenderInstanceShaders::addStage (const vk::DeviceInterface&			vki,
									  vk::VkDevice							device,
									  const vk::VkPhysicalDeviceFeatures&	deviceFeatures,
									  const vk::BinaryCollection&			programCollection,
									  const char*							name,
									  vk::VkShaderStageFlagBits				stage,
									  vk::Move<vk::VkShaderModule>*			outModule)
{
	if (programCollection.contains(name))
	{
		if (vk::isShaderStageSupported(deviceFeatures, stage))
		{
			vk::Move<vk::VkShaderModule>	module	= createShaderModule(vki, device, programCollection.get(name), (vk::VkShaderModuleCreateFlags)0);

			m_stageInfos.push_back(getShaderStageCreateInfo(stage, *module));
			*outModule = module;
		}
		else
		{
			// Wait for the GPU to idle so that throwing the exception
			// below doesn't free in-use GPU resource.
			vki.deviceWaitIdle(device);
			TCU_THROW(NotSupportedError, (de::toString(stage) + " is not supported").c_str());
		}
	}
}

vk::VkPipelineShaderStageCreateInfo RenderInstanceShaders::getShaderStageCreateInfo (vk::VkShaderStageFlagBits stage, vk::VkShaderModule shader) const
{
	const vk::VkPipelineShaderStageCreateInfo	stageCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineShaderStageCreateFlags)0,
		stage,			// stage
		shader,			// shader
		"main",
		DE_NULL,		// pSpecializationInfo
	};
	return stageCreateInfo;
}

class SingleCmdRenderInstance : public SingleTargetRenderInstance
{
public:
									SingleCmdRenderInstance	(Context&						context,
															 bool							isPrimaryCmdBuf,
															 const tcu::UVec2&				renderSize);

private:
	vk::Move<vk::VkPipeline>		createPipeline				(vk::VkPipelineLayout pipelineLayout);

	virtual vk::VkPipelineLayout	getPipelineLayout			(void) const = 0;
	virtual void					writeDrawCmdBuffer			(vk::VkCommandBuffer cmd) const = 0;

	void							renderToTarget				(void);

	const bool						m_isPrimaryCmdBuf;
};

SingleCmdRenderInstance::SingleCmdRenderInstance (Context&			context,
												  bool				isPrimaryCmdBuf,
												  const tcu::UVec2&	renderSize)
	: SingleTargetRenderInstance	(context, renderSize)
	, m_isPrimaryCmdBuf				(isPrimaryCmdBuf)
{
}

vk::Move<vk::VkPipeline> SingleCmdRenderInstance::createPipeline (vk::VkPipelineLayout pipelineLayout)
{
	const RenderInstanceShaders							shaderStages		(m_vki, m_device, m_context.getDeviceFeatures(), m_context.getBinaryCollection());
	const vk::VkPrimitiveTopology						topology			= shaderStages.hasTessellationStage() ? vk::VK_PRIMITIVE_TOPOLOGY_PATCH_LIST : vk::VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
	const vk::VkPipelineVertexInputStateCreateInfo		vertexInputState	=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineVertexInputStateCreateFlags)0,
		0u,											// bindingCount
		DE_NULL,									// pVertexBindingDescriptions
		0u,											// attributeCount
		DE_NULL,									// pVertexAttributeDescriptions
	};
	const vk::VkPipelineInputAssemblyStateCreateInfo	iaState				=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineInputAssemblyStateCreateFlags)0,
		topology,									// topology
		VK_FALSE,									// primitiveRestartEnable
	};
	const vk::VkPipelineTessellationStateCreateInfo		tessState			=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_TESSELLATION_STATE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineTessellationStateCreateFlags)0,
		3u,											// patchControlPoints
	};
	const vk::VkViewport								viewport			= vk::makeViewport(m_targetSize);
	const vk::VkRect2D									renderArea			= vk::makeRect2D(m_targetSize);
	const vk::VkPipelineViewportStateCreateInfo			vpState				=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineViewportStateCreateFlags)0,
		1u,											// viewportCount
		&viewport,
		1u,
		&renderArea,
	};
	const vk::VkPipelineRasterizationStateCreateInfo	rsState				=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineRasterizationStateCreateFlags)0,
		VK_FALSE,									// depthClipEnable
		VK_FALSE,									// rasterizerDiscardEnable
		vk::VK_POLYGON_MODE_FILL,					// fillMode
		vk::VK_CULL_MODE_NONE,						// cullMode
		vk::VK_FRONT_FACE_COUNTER_CLOCKWISE,		// frontFace
		VK_FALSE,									// depthBiasEnable
		0.0f,										// depthBias
		0.0f,										// depthBiasClamp
		0.0f,										// slopeScaledDepthBias
		1.0f,										// lineWidth
	};
	const vk::VkSampleMask								sampleMask			= 0x01u;
	const vk::VkPipelineMultisampleStateCreateInfo		msState				=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineMultisampleStateCreateFlags)0,
		vk::VK_SAMPLE_COUNT_1_BIT,					// rasterSamples
		VK_FALSE,									// sampleShadingEnable
		0.0f,										// minSampleShading
		&sampleMask,								// sampleMask
		VK_FALSE,									// alphaToCoverageEnable
		VK_FALSE,									// alphaToOneEnable
	};
	const vk::VkPipelineDepthStencilStateCreateInfo		dsState				=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineDepthStencilStateCreateFlags)0,
		VK_FALSE,									// depthTestEnable
		VK_FALSE,									// depthWriteEnable
		vk::VK_COMPARE_OP_ALWAYS,					// depthCompareOp
		VK_FALSE,									// depthBoundsTestEnable
		VK_FALSE,									// stencilTestEnable
		{ vk::VK_STENCIL_OP_KEEP, vk::VK_STENCIL_OP_KEEP, vk::VK_STENCIL_OP_KEEP, vk::VK_COMPARE_OP_ALWAYS, 0u, 0u, 0u },	// front
		{ vk::VK_STENCIL_OP_KEEP, vk::VK_STENCIL_OP_KEEP, vk::VK_STENCIL_OP_KEEP, vk::VK_COMPARE_OP_ALWAYS, 0u, 0u, 0u },	// back
		-1.0f,										// minDepthBounds
		+1.0f,										// maxDepthBounds
	};
	const vk::VkPipelineColorBlendAttachmentState		cbAttachment		=
	{
		VK_FALSE,									// blendEnable
		vk::VK_BLEND_FACTOR_ZERO,					// srcBlendColor
		vk::VK_BLEND_FACTOR_ZERO,					// destBlendColor
		vk::VK_BLEND_OP_ADD,						// blendOpColor
		vk::VK_BLEND_FACTOR_ZERO,					// srcBlendAlpha
		vk::VK_BLEND_FACTOR_ZERO,					// destBlendAlpha
		vk::VK_BLEND_OP_ADD,						// blendOpAlpha
		(vk::VK_COLOR_COMPONENT_R_BIT |
		 vk::VK_COLOR_COMPONENT_G_BIT |
		 vk::VK_COLOR_COMPONENT_B_BIT |
		 vk::VK_COLOR_COMPONENT_A_BIT),				// channelWriteMask
	};
	const vk::VkPipelineColorBlendStateCreateInfo		cbState				=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineColorBlendStateCreateFlags)0,
		VK_FALSE,									// logicOpEnable
		vk::VK_LOGIC_OP_CLEAR,						// logicOp
		1u,											// attachmentCount
		&cbAttachment,								// pAttachments
		{ 0.0f, 0.0f, 0.0f, 0.0f },					// blendConst
	};
	const vk::VkGraphicsPipelineCreateInfo createInfo =
	{
		vk::VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineCreateFlags)0,
		shaderStages.getNumStages(),									// stageCount
		shaderStages.getStages(),										// pStages
		&vertexInputState,												// pVertexInputState
		&iaState,														// pInputAssemblyState
		(shaderStages.hasTessellationStage() ? &tessState : DE_NULL),	// pTessellationState
		&vpState,														// pViewportState
		&rsState,														// pRasterState
		&msState,														// pMultisampleState
		&dsState,														// pDepthStencilState
		&cbState,														// pColorBlendState
		(const vk::VkPipelineDynamicStateCreateInfo*)DE_NULL,			// pDynamicState
		pipelineLayout,													// layout
		*m_renderPass,													// renderPass
		0u,																// subpass
		(vk::VkPipeline)0,												// basePipelineHandle
		0u,																// basePipelineIndex
	};
	return createGraphicsPipeline(m_vki, m_device, (vk::VkPipelineCache)0u, &createInfo);
}

void SingleCmdRenderInstance::renderToTarget (void)
{
	const vk::VkRect2D									renderArea						=
	{
		{ 0, 0 },								// offset
		{ m_targetSize.x(), m_targetSize.y() },	// extent
	};
	const vk::VkCommandBufferInheritanceInfo			passCmdBufInheritInfo			=
	{
		vk::VK_STRUCTURE_TYPE_COMMAND_BUFFER_INHERITANCE_INFO,
		DE_NULL,
		(vk::VkRenderPass)*m_renderPass,						// renderPass
		0u,														// subpass
		(vk::VkFramebuffer)*m_framebuffer,						// framebuffer
		VK_FALSE,												// occlusionQueryEnable
		(vk::VkQueryControlFlags)0,
		(vk::VkQueryPipelineStatisticFlags)0,
	};
	const vk::VkCommandBufferBeginInfo					passCmdBufBeginInfo				=
	{
		vk::VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO,
		DE_NULL,
		vk::VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT |
		vk::VK_COMMAND_BUFFER_USAGE_RENDER_PASS_CONTINUE_BIT,	// flags
		&passCmdBufInheritInfo,
	};

	const vk::VkPipelineLayout							pipelineLayout				(getPipelineLayout());
	const vk::Unique<vk::VkPipeline>					pipeline					(createPipeline(pipelineLayout));
	const vk::Unique<vk::VkCommandBuffer>				mainCmd						(vk::allocateCommandBuffer(m_vki, m_device, *m_cmdPool, vk::VK_COMMAND_BUFFER_LEVEL_PRIMARY));
	const vk::Unique<vk::VkCommandBuffer>				passCmd						((m_isPrimaryCmdBuf) ? (vk::Move<vk::VkCommandBuffer>()) : (vk::allocateCommandBuffer(m_vki, m_device, *m_cmdPool, vk::VK_COMMAND_BUFFER_LEVEL_SECONDARY)));
	const vk::Unique<vk::VkFence>						fence						(vk::createFence(m_vki, m_device));
	const vk::VkSubpassContents							passContents				= (m_isPrimaryCmdBuf) ? (vk::VK_SUBPASS_CONTENTS_INLINE) : (vk::VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS);

	beginCommandBuffer(m_vki, *mainCmd);
	beginRenderPass(m_vki, *mainCmd, *m_renderPass, *m_framebuffer, renderArea, tcu::Vec4(0.0f), passContents);

	if (m_isPrimaryCmdBuf)
	{
		m_vki.cmdBindPipeline(*mainCmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, *pipeline);
		writeDrawCmdBuffer(*mainCmd);
	}
	else
	{
		VK_CHECK(m_vki.beginCommandBuffer(*passCmd, &passCmdBufBeginInfo));
		m_vki.cmdBindPipeline(*passCmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, *pipeline);
		writeDrawCmdBuffer(*passCmd);
		endCommandBuffer(m_vki, *passCmd);

		m_vki.cmdExecuteCommands(*mainCmd, 1, &passCmd.get());
	}

	endRenderPass(m_vki, *mainCmd);
	endCommandBuffer(m_vki, *mainCmd);

	// submit and wait for them to finish before exiting scope. (Killing in-flight objects is a no-no).
	submitCommandsAndWait(m_vki, m_device, m_queue, mainCmd.get());
}

enum DescriptorSetCount
{
	DESCRIPTOR_SET_COUNT_SINGLE = 0,				//!< single descriptor set
	DESCRIPTOR_SET_COUNT_MULTIPLE,					//!< multiple descriptor sets
	DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS,	//!< multiple discontiguous descriptor sets

	DESCRIPTOR_SET_COUNT_LAST
};

deUint32 getDescriptorSetCount (DescriptorSetCount count)
{
	switch (count)
	{
		case DESCRIPTOR_SET_COUNT_SINGLE:
			return 1u;
		case DESCRIPTOR_SET_COUNT_MULTIPLE:
		case DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS:
			return 2u;
		default:
			DE_FATAL("Impossible");
			return 0u;
	}
}

deUint32 getDescriptorSetNdx (DescriptorSetCount count, deUint32 setNdx)
{
	DE_ASSERT(setNdx < getDescriptorSetCount(count));

	const deUint32	contiguousNdx[]		= { 0, 1 };
	const deUint32	discontiguousNdx[]	= { 0, 2 };

	switch (count)
	{
		case DESCRIPTOR_SET_COUNT_SINGLE:
			return 0u;
		case DESCRIPTOR_SET_COUNT_MULTIPLE:
			return contiguousNdx[setNdx];
		case DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS:
			return discontiguousNdx[setNdx];
		default:
			DE_FATAL("Impossible");
			return 0u;
	}
}

enum ShaderInputInterface
{
	SHADER_INPUT_SINGLE_DESCRIPTOR = 0,					//!< one descriptor
	SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS,		//!< multiple descriptors with contiguous binding id's
	SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS,	//!< multiple descriptors with discontiguous binding id's
	SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS,		//!< multiple descriptors with large gaps between binding id's
	SHADER_INPUT_DESCRIPTOR_ARRAY,						//!< descriptor array

	SHADER_INPUT_LAST
};

deUint32 getInterfaceNumResources (ShaderInputInterface shaderInterface)
{
	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:					return 1u;
		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:		return 2u;
		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:	return 2u;
		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:		return 2u;
		case SHADER_INPUT_DESCRIPTOR_ARRAY:						return 2u;

		default:
			DE_FATAL("Impossible");
			return 0u;
	}
}

deUint32 getArbitraryBindingIndex (deUint32 ndx)
{
	DE_ASSERT(ndx < 2);

	// Binding decoration value can be any 32-bit unsigned integer value.
	// 0xFFFE is the largest binding value accepted by glslang

	const deUint32	bufferIndices[] =
	{
		0x7FFEu,
		0xFFFEu
	};

	return bufferIndices[ndx];
}

typedef de::MovePtr<vk::Allocation>						AllocationMp;
typedef de::SharedPtr<vk::Allocation>					AllocationSp;
typedef vk::Unique<vk::VkBuffer>						BufferHandleUp;
typedef de::SharedPtr<BufferHandleUp>					BufferHandleSp;
typedef vk::Unique<vk::VkBufferView>					BufferViewHandleUp;
typedef de::SharedPtr<BufferViewHandleUp>				BufferViewHandleSp;
typedef vk::Unique<vk::VkSampler>						SamplerHandleUp;
typedef de::SharedPtr<SamplerHandleUp>					SamplerHandleSp;
typedef vk::Unique<vk::VkImage>							ImageHandleUp;
typedef de::SharedPtr<ImageHandleUp>					ImageHandleSp;
typedef vk::Unique<vk::VkImageView>						ImageViewHandleUp;
typedef de::SharedPtr<ImageViewHandleUp>				ImageViewHandleSp;
typedef vk::Unique<vk::VkDescriptorSet>					DescriptorSetHandleUp;
typedef de::SharedPtr<DescriptorSetHandleUp>			DescriptorSetHandleSp;
typedef vk::Unique<vk::VkDescriptorSetLayout>			DescriptorSetLayoutHandleUp;
typedef de::SharedPtr<DescriptorSetLayoutHandleUp>		DescriptorSetLayoutHandleSp;
typedef vk::Unique<vk::VkDescriptorUpdateTemplate>		UpdateTemplateHandleUp;
typedef de::SharedPtr<UpdateTemplateHandleUp>			UpdateTemplateHandleSp;

class BufferRenderInstance : public SingleCmdRenderInstance
{
public:
													BufferRenderInstance			(Context&											context,
																					 DescriptorUpdateMethod								updateMethod,
																					 bool												isPrimaryCmdBuf,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 vk::VkShaderStageFlags								stageFlags,
																					 ShaderInputInterface								shaderInterface,
																					 bool												viewOffset,
																					 bool												dynamicOffset,
																					 bool												dynamicOffsetNonZero);

	static std::vector<deUint32>					getViewOffsets					(DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 bool												setViewOffset);

	static std::vector<deUint32>					getDynamicOffsets				(DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 bool												dynamicOffsetNonZero);

	static std::vector<BufferHandleSp>				createSourceBuffers				(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::Allocator&										allocator,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 const std::vector<deUint32>&						viewOffset,
																					 const std::vector<deUint32>&						dynamicOffset,
																					 std::vector<AllocationSp>&							bufferMemory);

	static vk::Move<vk::VkBuffer>					createSourceBuffer				(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::Allocator&										allocator,
																					 vk::VkDescriptorType								descriptorType,
																					 deUint32											setNdx,
																					 deUint32											offset,
																					 deUint32											bufferSize,
																					 de::MovePtr<vk::Allocation>*						outMemory);

	static vk::Move<vk::VkDescriptorPool>			createDescriptorPool			(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface);

	static std::vector<DescriptorSetLayoutHandleSp>	createDescriptorSetLayouts		(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 vk::VkShaderStageFlags								stageFlags,
																					 DescriptorUpdateMethod								updateMethod);

	static vk::Move<vk::VkPipelineLayout>			createPipelineLayout			(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayout);

	static std::vector<DescriptorSetHandleSp>		createDescriptorSets			(const vk::DeviceInterface&							vki,
																					 DescriptorUpdateMethod								updateMethod,
																					 vk::VkDevice										device,
																					 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayouts,
																					 vk::VkDescriptorPool								descriptorPool,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 const std::vector<BufferHandleSp>&					buffers,
																					 const std::vector<deUint32>&						offsets,
																					 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																					 std::vector<deUint32>&								descriptorsPerSet,
																					 std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																					 std::vector<RawUpdateRegistry>&					updateRegistry,
																					 vk::VkPipelineLayout								pipelineLayout = DE_NULL);

	static void										writeDescriptorSet				(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 ShaderInputInterface								shaderInterface,
																					 vk::VkBuffer										sourceBufferA,
																					 const deUint32										viewOffsetA,
																					 vk::VkBuffer										sourceBufferB,
																					 const deUint32										viewOffsetB,
																					 vk::VkDescriptorSet								descriptorSet,
																					 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																					 std::vector<deUint32>&								descriptorsPerSet,
																					 DescriptorUpdateMethod								updateMethod = DESCRIPTOR_UPDATE_METHOD_NORMAL);

	static void										writeDescriptorSetWithTemplate	(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorSetLayout							descriptorSetLayout,
																					 deUint32											setNdx,
																					 vk::VkDescriptorPool								descriptorPool,
																					 vk::VkDescriptorType								descriptorType,
																					 ShaderInputInterface								shaderInterface,
																					 vk::VkBuffer										sourceBufferA,
																					 const deUint32										viewOffsetA,
																					 vk::VkBuffer										sourceBufferB,
																					 const deUint32										viewOffsetB,
																					 vk::VkDescriptorSet								descriptorSet,
																					 std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																					 std::vector<RawUpdateRegistry>&					registry,
																					 bool												withPush = false,
																					 vk::VkPipelineLayout								pipelineLayout = 0);

	void											logTestPlan						(void) const;
	vk::VkPipelineLayout							getPipelineLayout				(void) const;
	void											writeDrawCmdBuffer				(vk::VkCommandBuffer cmd) const;
	tcu::TestStatus									verifyResultImage				(const tcu::ConstPixelBufferAccess& result) const;

	enum
	{
		RENDER_SIZE				= 128,
		BUFFER_DATA_SIZE		= 8 * sizeof(float),
		BUFFER_SIZE_A			= 2048, //!< a lot more than required
		BUFFER_SIZE_B			= 2560, //!< a lot more than required
		BUFFER_SIZE_C			= 2128, //!< a lot more than required
		BUFFER_SIZE_D			= 2136, //!< a lot more than required

		STATIC_OFFSET_VALUE_A	= 256,
		DYNAMIC_OFFSET_VALUE_A	= 512,
		STATIC_OFFSET_VALUE_B	= 1024,
		DYNAMIC_OFFSET_VALUE_B	= 768,
		STATIC_OFFSET_VALUE_C	= 512,
		DYNAMIC_OFFSET_VALUE_C	= 512,
		STATIC_OFFSET_VALUE_D	= 768,
		DYNAMIC_OFFSET_VALUE_D	= 1024,
	};

	const DescriptorUpdateMethod					m_updateMethod;
	const vk::VkDescriptorType						m_descriptorType;
	const DescriptorSetCount						m_descriptorSetCount;
	const ShaderInputInterface						m_shaderInterface;
	const bool										m_setViewOffset;
	const bool										m_setDynamicOffset;
	const bool										m_dynamicOffsetNonZero;
	const vk::VkShaderStageFlags					m_stageFlags;

	const std::vector<deUint32>						m_viewOffset;
	const std::vector<deUint32>						m_dynamicOffset;

	std::vector<AllocationSp>						m_bufferMemory;
	const std::vector<BufferHandleSp>				m_sourceBuffer;
	const vk::Unique<vk::VkDescriptorPool>			m_descriptorPool;
	std::vector<UpdateTemplateHandleSp>				m_updateTemplates;
	std::vector<RawUpdateRegistry>					m_updateRegistry;
	vk::DescriptorSetUpdateBuilder					m_updateBuilder;
	const std::vector<DescriptorSetLayoutHandleSp>	m_descriptorSetLayouts;
	const vk::Unique<vk::VkPipelineLayout>			m_pipelineLayout;
	std::vector<deUint32>							m_descriptorsPerSet;
	const std::vector<DescriptorSetHandleSp>		m_descriptorSets;
};

BufferRenderInstance::BufferRenderInstance	(Context&						context,
											 DescriptorUpdateMethod			updateMethod,
											 bool							isPrimaryCmdBuf,
											 vk::VkDescriptorType			descriptorType,
											 DescriptorSetCount				descriptorSetCount,
											 vk::VkShaderStageFlags			stageFlags,
											 ShaderInputInterface			shaderInterface,
											 bool							viewOffset,
											 bool							dynamicOffset,
											 bool							dynamicOffsetNonZero)
	: SingleCmdRenderInstance		(context, isPrimaryCmdBuf, tcu::UVec2(RENDER_SIZE, RENDER_SIZE))
	, m_updateMethod				(updateMethod)
	, m_descriptorType				(descriptorType)
	, m_descriptorSetCount			(descriptorSetCount)
	, m_shaderInterface				(shaderInterface)
	, m_setViewOffset				(viewOffset)
	, m_setDynamicOffset			(dynamicOffset)
	, m_dynamicOffsetNonZero		(dynamicOffsetNonZero)
	, m_stageFlags					(stageFlags)
	, m_viewOffset					(getViewOffsets(m_descriptorSetCount, m_shaderInterface, m_setViewOffset))
	, m_dynamicOffset				(getDynamicOffsets(m_descriptorSetCount, m_shaderInterface, m_dynamicOffsetNonZero))
	, m_bufferMemory				()
	, m_sourceBuffer				(createSourceBuffers(m_vki, m_device, m_allocator, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_viewOffset, m_dynamicOffset, m_bufferMemory))
	, m_descriptorPool				(createDescriptorPool(m_vki, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface))
	, m_updateTemplates				()
	, m_updateRegistry				()
	, m_updateBuilder				()
	, m_descriptorSetLayouts		(createDescriptorSetLayouts(m_vki, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_stageFlags, m_updateMethod))
	, m_pipelineLayout				(createPipelineLayout(m_vki, m_device, m_descriptorSetLayouts))
	, m_descriptorsPerSet			()
	, m_descriptorSets				(createDescriptorSets(m_vki, m_updateMethod, m_device, m_descriptorSetLayouts, *m_descriptorPool, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_sourceBuffer, m_viewOffset, m_updateBuilder, m_descriptorsPerSet, m_updateTemplates, m_updateRegistry, *m_pipelineLayout))
{
	if (m_setDynamicOffset)
		DE_ASSERT(isDynamicDescriptorType(m_descriptorType));
	if (m_dynamicOffsetNonZero)
		DE_ASSERT(m_setDynamicOffset);
}

std::vector<deUint32> BufferRenderInstance::getViewOffsets (DescriptorSetCount		descriptorSetCount,
															ShaderInputInterface	shaderInterface,
															bool					setViewOffset)
{
	const int				numBuffers		= getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface);
	std::vector<deUint32>	viewOffset;

	for (int bufferNdx = 0; bufferNdx < numBuffers; bufferNdx++)
	{
		const deUint32 staticOffsetValues[] =
		{
			STATIC_OFFSET_VALUE_A,
			STATIC_OFFSET_VALUE_B,
			STATIC_OFFSET_VALUE_C,
			STATIC_OFFSET_VALUE_D
		};

		viewOffset.push_back(setViewOffset ? (staticOffsetValues[bufferNdx % getInterfaceNumResources(shaderInterface)]) : (0u));
	}

	return viewOffset;
}

std::vector<deUint32> BufferRenderInstance::getDynamicOffsets (DescriptorSetCount	descriptorSetCount,
															   ShaderInputInterface	shaderInterface,
															   bool					dynamicOffsetNonZero)
{
	const int				numBuffers		= getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface);
	std::vector<deUint32>	dynamicOffset;

	for (int bufferNdx = 0; bufferNdx < numBuffers; bufferNdx++)
	{
		const deUint32 dynamicOffsetValues[] =
		{
			DYNAMIC_OFFSET_VALUE_A,
			DYNAMIC_OFFSET_VALUE_B,
			DYNAMIC_OFFSET_VALUE_C,
			DYNAMIC_OFFSET_VALUE_D
		};

		dynamicOffset.push_back(dynamicOffsetNonZero ? (dynamicOffsetValues[bufferNdx % getInterfaceNumResources(shaderInterface)]) : (0u));
	}

	return dynamicOffset;
}

std::vector<BufferHandleSp> BufferRenderInstance::createSourceBuffers (const vk::DeviceInterface&	vki,
																	   vk::VkDevice					device,
																	   vk::Allocator&				allocator,
																	   vk::VkDescriptorType			descriptorType,
																	   DescriptorSetCount			descriptorSetCount,
																	   ShaderInputInterface			shaderInterface,
																	   const std::vector<deUint32>&	viewOffset,
																	   const std::vector<deUint32>&	dynamicOffset,
																	   std::vector<AllocationSp>&	bufferMemory)
{
	const int					numBuffers		= getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface);
	std::vector<deUint32>		effectiveOffset;
	std::vector<deUint32>		bufferSize;
	std::vector<BufferHandleSp> sourceBuffers;

	for (int bufferNdx = 0; bufferNdx < numBuffers; bufferNdx++)
	{
		const deUint32 bufferSizeValues[] =
		{
			BUFFER_SIZE_A,
			BUFFER_SIZE_B,
			BUFFER_SIZE_C,
			BUFFER_SIZE_D
		};

		effectiveOffset.push_back(isDynamicDescriptorType(descriptorType) ? (viewOffset[bufferNdx] + dynamicOffset[bufferNdx]) : (viewOffset[bufferNdx]));
		bufferSize.push_back(bufferSizeValues[bufferNdx % getInterfaceNumResources(shaderInterface)]);
	}


	// Create source buffers
	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		for (deUint32 bufferNdx = 0; bufferNdx < getInterfaceNumResources(shaderInterface); bufferNdx++)
		{
			de::MovePtr<vk::Allocation>	memory;
			vk::Move<vk::VkBuffer>		buffer = createSourceBuffer(vki, device, allocator, descriptorType, setNdx, effectiveOffset[bufferNdx], bufferSize[bufferNdx], &memory);

			bufferMemory.push_back(AllocationSp(memory.release()));
			sourceBuffers.push_back(BufferHandleSp(new BufferHandleUp(buffer)));
		}
	}

	return sourceBuffers;
}

vk::Move<vk::VkBuffer> BufferRenderInstance::createSourceBuffer (const vk::DeviceInterface&		vki,
																 vk::VkDevice					device,
																 vk::Allocator&					allocator,
																 vk::VkDescriptorType			descriptorType,
																 deUint32						setNdx,
																 deUint32						offset,
																 deUint32						bufferSize,
																 de::MovePtr<vk::Allocation>*	outMemory)
{
	static const float				s_colors[]			=
	{
		0.0f, 1.0f, 0.0f, 1.0f,		// green
		1.0f, 1.0f, 0.0f, 1.0f,		// yellow
		0.0f, 0.0f, 1.0f, 1.0f,		// blue
		1.0f, 0.0f, 0.0f, 1.0f		// red
	};
	DE_STATIC_ASSERT(sizeof(s_colors) / 2 == BUFFER_DATA_SIZE);
	DE_ASSERT(offset + BUFFER_DATA_SIZE <= bufferSize);
	DE_ASSERT(offset % sizeof(float) == 0);
	DE_ASSERT(bufferSize % sizeof(float) == 0);

	const bool						isUniformBuffer		= isUniformDescriptorType(descriptorType);
	const vk::VkBufferUsageFlags	usageFlags			= (isUniformBuffer) ? (vk::VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT) : (vk::VK_BUFFER_USAGE_STORAGE_BUFFER_BIT);
	const float						preGuardValue		= 0.5f;
	const float						postGuardValue		= 0.75f;
	const vk::VkBufferCreateInfo	bufferCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
		DE_NULL,
		0u,								// flags
		bufferSize,						// size
		usageFlags,						// usage
		vk::VK_SHARING_MODE_EXCLUSIVE,	// sharingMode
		0u,								// queueFamilyCount
		DE_NULL,						// pQueueFamilyIndices
	};
	vk::Move<vk::VkBuffer>			buffer				(vk::createBuffer(vki, device, &bufferCreateInfo));
	de::MovePtr<vk::Allocation>		bufferMemory		= allocateAndBindObjectMemory(vki, device, allocator, *buffer, vk::MemoryRequirement::HostVisible);
	void* const						mapPtr				= bufferMemory->getHostPtr();

	// guard with interesting values
	for (size_t preGuardOffset = 0; preGuardOffset + sizeof(float) <= (size_t)offset; preGuardOffset += sizeof(float))
		deMemcpy((deUint8*)mapPtr + preGuardOffset, &preGuardValue, sizeof(float));

	deMemcpy((deUint8*)mapPtr + offset, &s_colors[8 * (setNdx % 2)], sizeof(s_colors) / 2);
	for (size_t postGuardOffset = (size_t)offset + sizeof(s_colors) / 2; postGuardOffset + sizeof(float) <= (size_t)bufferSize; postGuardOffset += sizeof(float))
		deMemcpy((deUint8*)mapPtr + postGuardOffset, &postGuardValue, sizeof(float));
	deMemset((deUint8*)mapPtr + offset + sizeof(s_colors) / 2, 0x5A, (size_t)bufferSize - (size_t)offset - sizeof(s_colors) / 2); // fill with interesting pattern that produces valid floats

	flushAlloc(vki, device, *bufferMemory);

	// Flushed host-visible memory is automatically made available to the GPU, no barrier is needed.

	*outMemory = bufferMemory;
	return buffer;
}

vk::Move<vk::VkDescriptorPool> BufferRenderInstance::createDescriptorPool (const vk::DeviceInterface&	vki,
																		   vk::VkDevice					device,
																		   vk::VkDescriptorType			descriptorType,
																		   DescriptorSetCount			descriptorSetCount,
																		   ShaderInputInterface			shaderInterface)
{
	return vk::DescriptorPoolBuilder()
		.addType(descriptorType, getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface))
		.build(vki, device, vk::VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, getDescriptorSetCount(descriptorSetCount));
}

std::vector<DescriptorSetLayoutHandleSp> BufferRenderInstance::createDescriptorSetLayouts (const vk::DeviceInterface&	vki,
																						   vk::VkDevice					device,
																						   vk::VkDescriptorType			descriptorType,
																						   DescriptorSetCount			descriptorSetCount,
																						   ShaderInputInterface			shaderInterface,
																						   vk::VkShaderStageFlags		stageFlags,
																						   DescriptorUpdateMethod		updateMethod)
{
	vk::VkDescriptorSetLayoutCreateFlags	extraFlags			= 0;

	if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE ||
		updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		extraFlags |= vk::VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR;
	}

	std::vector<DescriptorSetLayoutHandleSp> descriptorSetLayouts;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		vk::DescriptorSetLayoutBuilder		builder;
		switch (shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				builder.addSingleBinding(descriptorType, stageFlags);
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				builder.addSingleBinding(descriptorType, stageFlags);
				builder.addSingleBinding(descriptorType, stageFlags);
				break;

			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				builder.addSingleIndexedBinding(descriptorType, stageFlags, 0u);
				builder.addSingleIndexedBinding(descriptorType, stageFlags, 2u);
				break;

			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				builder.addSingleIndexedBinding(descriptorType, stageFlags, getArbitraryBindingIndex(0));
				builder.addSingleIndexedBinding(descriptorType, stageFlags, getArbitraryBindingIndex(1));
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				builder.addArrayBinding(descriptorType, 2u, stageFlags);
				break;

			default:
				DE_FATAL("Impossible");
		}

		vk::Move<vk::VkDescriptorSetLayout>	layout		= builder.build(vki, device, extraFlags);
		descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(layout)));

		// Add an empty descriptor set layout between sets 0 and 2
		if (setNdx == 0 && descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS)
		{
			vk::DescriptorSetLayoutBuilder		emptyBuilder;
			vk::Move<vk::VkDescriptorSetLayout>	emptyLayout = emptyBuilder.build(vki, device, (vk::VkDescriptorSetLayoutCreateFlags)0);
			descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(emptyLayout)));
		}
	}
	return descriptorSetLayouts;
}

vk::Move<vk::VkPipelineLayout> BufferRenderInstance::createPipelineLayout (const vk::DeviceInterface&						vki,
																		   vk::VkDevice										device,
																		   const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayout)
{
	std::vector<vk::VkDescriptorSetLayout>	layoutHandles;
	for (size_t setNdx = 0; setNdx < descriptorSetLayout.size(); setNdx++)
		layoutHandles.push_back(**descriptorSetLayout[setNdx]);

	const vk::VkPipelineLayoutCreateInfo	createInfo =
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineLayoutCreateFlags)0,
		(deUint32)layoutHandles.size(),				// descriptorSetCount
		&layoutHandles.front(),						// pSetLayouts
		0u,											// pushConstantRangeCount
		DE_NULL,									// pPushConstantRanges
	};
	return vk::createPipelineLayout(vki, device, &createInfo);
}

std::vector<DescriptorSetHandleSp> BufferRenderInstance::createDescriptorSets (const vk::DeviceInterface&						vki,
																			   DescriptorUpdateMethod							updateMethod,
																			   vk::VkDevice										device,
																			   const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayouts,
																			   vk::VkDescriptorPool								descriptorPool,
																			   vk::VkDescriptorType								descriptorType,
																			   DescriptorSetCount								descriptorSetCount,
																			   ShaderInputInterface								shaderInterface,
																			   const std::vector<BufferHandleSp>&				buffers,
																			   const std::vector<deUint32>&						offsets,
																			   vk::DescriptorSetUpdateBuilder&					updateBuilder,
																			   std::vector<deUint32>&							descriptorsPerSet,
																			   std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																			   std::vector<RawUpdateRegistry>&					updateRegistry,
																			   vk::VkPipelineLayout								pipelineLayout)
{
	std::vector<DescriptorSetHandleSp> descriptorSets;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		vk::VkDescriptorSetLayout				layout			= **descriptorSetLayouts[getDescriptorSetNdx(descriptorSetCount, setNdx)];
		const vk::VkDescriptorSetAllocateInfo	allocInfo		=
		{
			vk::VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
			DE_NULL,
			descriptorPool,
			1u,
			&layout
		};

		vk::VkBuffer							bufferA			= **buffers[(setNdx * getInterfaceNumResources(shaderInterface)) % buffers.size()];
		vk::VkBuffer							bufferB			= **buffers[(setNdx * getInterfaceNumResources(shaderInterface) + 1) % buffers.size()];
		deUint32								offsetA			= offsets[(setNdx * getInterfaceNumResources(shaderInterface)) % offsets.size()];
		deUint32								offsetB			= offsets[(setNdx * getInterfaceNumResources(shaderInterface) + 1) % offsets.size()];

		vk::Move<vk::VkDescriptorSet>			descriptorSet;

		if (updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH && updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			descriptorSet = allocateDescriptorSet(vki, device, &allocInfo);
		}
		else
		{
			descriptorSet = vk::Move<vk::VkDescriptorSet>();
		}

		if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE)
		{
			writeDescriptorSetWithTemplate(vki, device, layout, setNdx, descriptorPool, descriptorType, shaderInterface, bufferA, offsetA, bufferB, offsetB, *descriptorSet, updateTemplates, updateRegistry);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			writeDescriptorSetWithTemplate(vki, device, layout, setNdx, descriptorPool, descriptorType, shaderInterface, bufferA, offsetA, bufferB, offsetB, *descriptorSet, updateTemplates, updateRegistry, true, pipelineLayout);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
		{
			writeDescriptorSet(vki, device, descriptorType, shaderInterface, bufferA, offsetA, bufferB, offsetB, *descriptorSet, updateBuilder, descriptorsPerSet, updateMethod);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
		{
			writeDescriptorSet(vki, device, descriptorType, shaderInterface, bufferA, offsetA, bufferB, offsetB, *descriptorSet, updateBuilder, descriptorsPerSet);
		}

		descriptorSets.push_back(DescriptorSetHandleSp(new DescriptorSetHandleUp(descriptorSet)));
	}
	return descriptorSets;
}

void BufferRenderInstance::writeDescriptorSet (const vk::DeviceInterface&			vki,
											   vk::VkDevice							device,
											   vk::VkDescriptorType					descriptorType,
											   ShaderInputInterface					shaderInterface,
											   vk::VkBuffer							bufferA,
											   const deUint32						offsetA,
											   vk::VkBuffer							bufferB,
											   const deUint32						offsetB,
											   vk::VkDescriptorSet					descriptorSet,
											   vk::DescriptorSetUpdateBuilder&		updateBuilder,
											   std::vector<deUint32>&				descriptorsPerSet,
											   DescriptorUpdateMethod				updateMethod)
{
	const vk::VkDescriptorBufferInfo		bufferInfos[2]	=
	{
		vk::makeDescriptorBufferInfo(bufferA, (vk::VkDeviceSize)offsetA, (vk::VkDeviceSize)BUFFER_DATA_SIZE),
		vk::makeDescriptorBufferInfo(bufferB, (vk::VkDeviceSize)offsetB, (vk::VkDeviceSize)BUFFER_DATA_SIZE),
	};
	deUint32								numDescriptors	= 0u;

	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &bufferInfos[0]);
			numDescriptors++;
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &bufferInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(1u), descriptorType, &bufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &bufferInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(2u), descriptorType, &bufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), descriptorType, &bufferInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), descriptorType, &bufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, 2u, bufferInfos);
			numDescriptors++;
			break;

		default:
			DE_FATAL("Impossible");
	}

	descriptorsPerSet.push_back(numDescriptors);

	if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		updateBuilder.update(vki, device);
		updateBuilder.clear();
	}
}

void BufferRenderInstance::writeDescriptorSetWithTemplate (const vk::DeviceInterface&						vki,
														   vk::VkDevice										device,
														   vk::VkDescriptorSetLayout						layout,
														   deUint32											setNdx,
														   vk::VkDescriptorPool								descriptorPool,
														   vk::VkDescriptorType								descriptorType,
														   ShaderInputInterface								shaderInterface,
														   vk::VkBuffer										bufferA,
														   const deUint32									offsetA,
														   vk::VkBuffer										bufferB,
														   const deUint32									offsetB,
														   vk::VkDescriptorSet								descriptorSet,
														   std::vector<UpdateTemplateHandleSp>&				updateTemplates,
														   std::vector<RawUpdateRegistry>&					registry,
														   bool												withPush,
														   vk::VkPipelineLayout								pipelineLayout)
{
	DE_UNREF(descriptorPool);
	const vk::VkDescriptorBufferInfo						bufferInfos[2]		=
	{
		vk::makeDescriptorBufferInfo(bufferA, (vk::VkDeviceSize)offsetA, (vk::VkDeviceSize)BUFFER_DATA_SIZE),
		vk::makeDescriptorBufferInfo(bufferB, (vk::VkDeviceSize)offsetB, (vk::VkDeviceSize)BUFFER_DATA_SIZE),
	};
	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// descriptorUpdateEntryCount
		DE_NULL,	// pDescriptorUpdateEntries
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_GRAPHICS,
		pipelineLayout,
		setNdx
	};

	RawUpdateRegistry										updateRegistry;

	updateRegistry.addWriteObject(bufferInfos[0]);
	updateRegistry.addWriteObject(bufferInfos[1]);

	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateEntries.push_back(createTemplateBinding(0u, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(0u, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(1u, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(0u, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(2u, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateEntries.push_back(createTemplateBinding(0u, 0, 2, descriptorType, updateRegistry.getWriteObjectOffset(0), sizeof(bufferInfos[0])));
			break;

		default:
			DE_FATAL("Impossible");
	}

	templateCreateInfo.pDescriptorUpdateEntries			= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount		= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(vki, device, &templateCreateInfo);
	updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	registry.push_back(updateRegistry);

	if (!withPush)
	{
		vki.updateDescriptorSetWithTemplate(device, descriptorSet, **updateTemplates.back(), registry.back().getRawPointer());
	}
}

void BufferRenderInstance::logTestPlan (void) const
{
	std::ostringstream msg;

	msg << "Rendering 2x2 yellow-green grid.\n"
		<< ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
		<< "Each descriptor set contains "
		<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
		<< " descriptor(s) of type " << vk::getDescriptorTypeName(m_descriptorType) << "\n"
		<< "Buffer view(s) have " << ((m_setViewOffset) ? ("non-") : ("")) << "zero offset.\n";

	if (isDynamicDescriptorType(m_descriptorType))
	{
		if (m_setDynamicOffset)
		{
			msg << "Source buffer(s) are given a dynamic offset at bind time.\n"
				<< "The supplied dynamic offset is " << ((m_dynamicOffsetNonZero) ? ("non-") : ("")) << "zero.\n";
		}
		else
		{
			msg << "Dynamic offset is not supplied at bind time. Expecting bind to offset 0.\n";
		}
	}

	if (m_stageFlags == 0u)
	{
		msg << "Descriptors are not accessed in any shader stage.\n";
	}
	else
	{
		msg << "Descriptors are accessed in {"
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_VERTEX_BIT) != 0)					? (" vertex")			: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0)	? (" tess_control")		: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT) != 0)	? (" tess_evaluation")	: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_GEOMETRY_BIT) != 0)				? (" geometry")			: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_FRAGMENT_BIT) != 0)				? (" fragment")			: (""))
			<< " } stages.\n";
	}

	m_context.getTestContext().getLog()
		<< tcu::TestLog::Message
		<< msg.str()
		<< tcu::TestLog::EndMessage;
}

vk::VkPipelineLayout BufferRenderInstance::getPipelineLayout (void) const
{
	return *m_pipelineLayout;
}

void BufferRenderInstance::writeDrawCmdBuffer (vk::VkCommandBuffer cmd) const
{
	if (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE && m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		std::vector<vk::VkDescriptorSet> sets;
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			sets.push_back(**m_descriptorSets[setNdx]);

		switch (m_descriptorSetCount)
		{
			case DESCRIPTOR_SET_COUNT_SINGLE:
			case DESCRIPTOR_SET_COUNT_MULTIPLE:
			{
				// \note dynamic offset replaces the view offset, i.e. it is not offset relative to the view offset
				const deUint32			numOffsets			= (!m_setDynamicOffset) ? (0u) : ((deUint32)m_dynamicOffset.size());
				const deUint32* const	dynamicOffsetPtr	= (!m_setDynamicOffset) ? (DE_NULL) : (&m_dynamicOffset.front());

				m_vki.cmdBindDescriptorSets(cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, getPipelineLayout(), 0, (int)sets.size(), &sets.front(), numOffsets, dynamicOffsetPtr);
				break;
			}
			case DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS:
			{
				deUint32 dynamicOffsetNdx = 0u;

				for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
				{
					// \note dynamic offset replaces the view offset, i.e. it is not offset relative to the view offset
					const deUint32			numOffsets			= (!m_setDynamicOffset) ? (0u) : (getInterfaceNumResources(m_shaderInterface));
					const deUint32* const	dynamicOffsetPtr	= (!m_setDynamicOffset) ? (DE_NULL) : (&m_dynamicOffset[dynamicOffsetNdx]);
					const deUint32			descriptorSetNdx	= getDescriptorSetNdx(m_descriptorSetCount, setNdx);

					m_vki.cmdBindDescriptorSets(cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, getPipelineLayout(), descriptorSetNdx, 1, &sets[setNdx], numOffsets, dynamicOffsetPtr);

					dynamicOffsetNdx += getInterfaceNumResources(m_shaderInterface);
				}
				break;
			}
			default:
				DE_FATAL("Impossible");
		}
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			m_vki.cmdPushDescriptorSetWithTemplateKHR(cmd, **m_updateTemplates[setNdx], getPipelineLayout(), setNdx, (const void*)m_updateRegistry[setNdx].getRawPointer());
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		deUint32 descriptorNdx = 0u;
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
		{
			const deUint32	numDescriptors = m_descriptorsPerSet[setNdx];
			m_updateBuilder.updateWithPush(m_vki, cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, *m_pipelineLayout, setNdx, descriptorNdx, numDescriptors);
			descriptorNdx += numDescriptors;
		}
	}

	m_vki.cmdDraw(cmd, 6 * 4, 1, 0, 0); // render four quads (two separate triangles)
}

tcu::TestStatus BufferRenderInstance::verifyResultImage (const tcu::ConstPixelBufferAccess& result) const
{
	const deUint32		numDescriptorSets	= getDescriptorSetCount(m_descriptorSetCount);
	const tcu::Vec4		green				(0.0f, 1.0f, 0.0f, 1.0f);
	const tcu::Vec4		yellow				(1.0f, 1.0f, 0.0f, 1.0f);
	tcu::Surface		reference			(m_targetSize.x(), m_targetSize.y());

	tcu::Vec4			sample0				= tcu::Vec4(0.0f);
	tcu::Vec4			sample1				= tcu::Vec4(0.0f);

	if (m_stageFlags)
	{
		const tcu::Vec4		colors[] =
		{
			tcu::Vec4(0.0f, 1.0f, 0.0f, 1.0f),		// green
			tcu::Vec4(1.0f, 1.0f, 0.0f, 1.0f),		// yellow
			tcu::Vec4(0.0f, 0.0f, 1.0f, 1.0f),		// blue
			tcu::Vec4(1.0f, 0.0f, 0.0f, 1.0f),		// red
		};


		for (deUint32 setNdx = 0; setNdx < numDescriptorSets; setNdx++)
		{
			sample0 += colors[2 * (setNdx % 2)];
			sample1 += colors[2 * (setNdx % 2) + 1];
		}

		if (numDescriptorSets > 1)
		{
			sample0 = sample0 / tcu::Vec4(float(numDescriptorSets));
			sample1 = sample1 / tcu::Vec4(float(numDescriptorSets));
		}
	}
	else
	{
		sample0 = green;
		sample1 = yellow;
	}

	drawQuadrantReferenceResult(reference.getAccess(), sample1, sample0, sample0, sample1);

	if (!bilinearCompare(m_context.getTestContext().getLog(), "Compare", "Result comparison", reference.getAccess(), result, tcu::RGBA(1, 1, 1, 1), tcu::COMPARE_LOG_RESULT))
		return tcu::TestStatus::fail("Image verification failed");
	else
		return tcu::TestStatus::pass("Pass");
}

class ComputeInstanceResultBuffer
{
public:
	enum
	{
		DATA_SIZE = sizeof(tcu::Vec4[4])
	};

											ComputeInstanceResultBuffer	(const vk::DeviceInterface&		vki,
																		 vk::VkDevice					device,
																		 vk::Allocator&					allocator);

	void									readResultContentsTo		(tcu::Vec4 (*results)[4]) const;

	inline vk::VkBuffer						getBuffer					(void) const { return *m_buffer;			}
	inline const vk::VkBufferMemoryBarrier*	getResultReadBarrier		(void) const { return &m_bufferBarrier;		}

private:
	static vk::Move<vk::VkBuffer>			createResultBuffer			(const vk::DeviceInterface&		vki,
																		 vk::VkDevice					device,
																		 vk::Allocator&					allocator,
																		 de::MovePtr<vk::Allocation>*	outAllocation);

	static vk::VkBufferMemoryBarrier		createResultBufferBarrier	(vk::VkBuffer buffer);

	const vk::DeviceInterface&				m_vki;
	const vk::VkDevice						m_device;

	de::MovePtr<vk::Allocation>				m_bufferMem;
	const vk::Unique<vk::VkBuffer>			m_buffer;
	const vk::VkBufferMemoryBarrier			m_bufferBarrier;
};

ComputeInstanceResultBuffer::ComputeInstanceResultBuffer (const vk::DeviceInterface&	vki,
														  vk::VkDevice					device,
														  vk::Allocator&				allocator)
	: m_vki				(vki)
	, m_device			(device)
	, m_bufferMem		(DE_NULL)
	, m_buffer			(createResultBuffer(m_vki, m_device, allocator, &m_bufferMem))
	, m_bufferBarrier	(createResultBufferBarrier(*m_buffer))
{
}

void ComputeInstanceResultBuffer::readResultContentsTo (tcu::Vec4 (*results)[4]) const
{
	invalidateAlloc(m_vki, m_device, *m_bufferMem);
	deMemcpy(*results, m_bufferMem->getHostPtr(), sizeof(*results));
}

vk::Move<vk::VkBuffer> ComputeInstanceResultBuffer::createResultBuffer (const vk::DeviceInterface&		vki,
																		vk::VkDevice					device,
																		vk::Allocator&					allocator,
																		de::MovePtr<vk::Allocation>*	outAllocation)
{
	const vk::VkBufferCreateInfo	createInfo	=
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
		DE_NULL,
		0u,											// flags
		(vk::VkDeviceSize)DATA_SIZE,				// size
		vk::VK_BUFFER_USAGE_STORAGE_BUFFER_BIT,		// usage
		vk::VK_SHARING_MODE_EXCLUSIVE,				// sharingMode
		0u,											// queueFamilyCount
		DE_NULL,									// pQueueFamilyIndices
	};
	vk::Move<vk::VkBuffer>			buffer		(vk::createBuffer(vki, device, &createInfo));
	de::MovePtr<vk::Allocation>		allocation	(allocateAndBindObjectMemory(vki, device, allocator, *buffer, vk::MemoryRequirement::HostVisible));
	const float						clearValue	= -1.0f;
	void*							mapPtr		= allocation->getHostPtr();

	for (size_t offset = 0; offset < DATA_SIZE; offset += sizeof(float))
		deMemcpy(((deUint8*)mapPtr) + offset, &clearValue, sizeof(float));

	flushAlloc(vki, device, *allocation);

	*outAllocation = allocation;
	return buffer;
}

vk::VkBufferMemoryBarrier ComputeInstanceResultBuffer::createResultBufferBarrier (vk::VkBuffer buffer)
{
	const vk::VkBufferMemoryBarrier bufferBarrier =
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
		DE_NULL,
		vk::VK_ACCESS_SHADER_WRITE_BIT,				// srcAccessMask
		vk::VK_ACCESS_HOST_READ_BIT,				// dstAccessMask
		VK_QUEUE_FAMILY_IGNORED,					// srcQueueFamilyIndex
		VK_QUEUE_FAMILY_IGNORED,					// destQueueFamilyIndex
		buffer,										// buffer
		(vk::VkDeviceSize)0u,						// offset
		DATA_SIZE,									// size
	};
	return bufferBarrier;
}

class ComputePipeline
{
public:
											ComputePipeline			(const vk::DeviceInterface&			vki,
																	 vk::VkDevice						device,
																	 const vk::BinaryCollection&		programCollection,
																	 deUint32							numDescriptorSets,
																	 const vk::VkDescriptorSetLayout*	descriptorSetLayouts);

	inline vk::VkPipeline					getPipeline				(void) const { return *m_pipeline;			};
	inline vk::VkPipelineLayout				getPipelineLayout		(void) const { return *m_pipelineLayout;	};

private:
	static vk::Move<vk::VkPipelineLayout>	createPipelineLayout	(const vk::DeviceInterface&			vki,
																	 vk::VkDevice						device,
																	 deUint32							numDescriptorSets,
																	 const vk::VkDescriptorSetLayout*	descriptorSetLayouts);

	static vk::Move<vk::VkPipeline>			createPipeline			(const vk::DeviceInterface&			vki,
																	 vk::VkDevice						device,
																	 const vk::BinaryCollection&		programCollection,
																	 vk::VkPipelineLayout				layout);

	const vk::Unique<vk::VkPipelineLayout>	m_pipelineLayout;
	const vk::Unique<vk::VkPipeline>		m_pipeline;
};

ComputePipeline::ComputePipeline (const vk::DeviceInterface&		vki,
								  vk::VkDevice						device,
								  const vk::BinaryCollection&		programCollection,
								  deUint32							numDescriptorSets,
								  const vk::VkDescriptorSetLayout*	descriptorSetLayouts)
	: m_pipelineLayout	(createPipelineLayout(vki, device, numDescriptorSets, descriptorSetLayouts))
	, m_pipeline		(createPipeline(vki, device, programCollection, *m_pipelineLayout))
{
}

vk::Move<vk::VkPipelineLayout> ComputePipeline::createPipelineLayout (const vk::DeviceInterface&		vki,
																	  vk::VkDevice						device,
																	  deUint32							numDescriptorSets,
																	  const vk::VkDescriptorSetLayout*	descriptorSetLayouts)
{
	const vk::VkPipelineLayoutCreateInfo createInfo =
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineLayoutCreateFlags)0,
		numDescriptorSets,		// descriptorSetCount
		descriptorSetLayouts,	// pSetLayouts
		0u,						// pushConstantRangeCount
		DE_NULL,				// pPushConstantRanges
	};
	return vk::createPipelineLayout(vki, device, &createInfo);
}

vk::Move<vk::VkPipeline> ComputePipeline::createPipeline (const vk::DeviceInterface&	vki,
														  vk::VkDevice					device,
														  const vk::BinaryCollection&	programCollection,
														  vk::VkPipelineLayout			layout)
{
	const vk::Unique<vk::VkShaderModule>		computeModule		(vk::createShaderModule(vki, device, programCollection.get("compute"), (vk::VkShaderModuleCreateFlags)0u));
	const vk::VkPipelineShaderStageCreateInfo	cs					=
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineShaderStageCreateFlags)0,
		vk::VK_SHADER_STAGE_COMPUTE_BIT,	// stage
		*computeModule,						// shader
		"main",
		DE_NULL,							// pSpecializationInfo
	};
	const vk::VkComputePipelineCreateInfo		createInfo			=
	{
		vk::VK_STRUCTURE_TYPE_COMPUTE_PIPELINE_CREATE_INFO,
		DE_NULL,
		0u,								// flags
		cs,								// cs
		layout,							// layout
		(vk::VkPipeline)0,				// basePipelineHandle
		0u,								// basePipelineIndex
	};
	return createComputePipeline(vki, device, (vk::VkPipelineCache)0u, &createInfo);
}

class ComputeCommand
{
public:
											ComputeCommand	(const vk::DeviceInterface&			vki,
															 vk::VkDevice						device,
															 vk::VkPipeline						pipeline,
															 vk::VkPipelineLayout				pipelineLayout,
															 const tcu::UVec3&					numWorkGroups,
															 ShaderInputInterface				shaderInterface,
															 DescriptorSetCount					descriptorSetCount,
															 const vk::VkDescriptorSet*			descriptorSets,
															 int								numDynamicOffsets,
															 const deUint32*					dynamicOffsets,
															 int								numPreBarriers,
															 const vk::VkBufferMemoryBarrier*	preBarriers,
															 int								numPostBarriers,
															 const vk::VkBufferMemoryBarrier*	postBarriers);

	void									submitAndWait	(deUint32 queueFamilyIndex, vk::VkQueue queue, std::vector<UpdateTemplateHandleSp>* updateTemplates = DE_NULL, std::vector<RawUpdateRegistry>* updateRegistry = DE_NULL) const;
	void									submitAndWait	(deUint32 queueFamilyIndex, vk::VkQueue queue, vk::DescriptorSetUpdateBuilder& updateBuilder, std::vector<deUint32>& descriptorsPerSet) const;

private:
	const vk::DeviceInterface&				m_vki;
	const vk::VkDevice						m_device;
	const vk::VkPipeline					m_pipeline;
	const vk::VkPipelineLayout				m_pipelineLayout;
	const tcu::UVec3						m_numWorkGroups;
	const ShaderInputInterface				m_shaderInterface;
	const DescriptorSetCount				m_descriptorSetCount;
	const vk::VkDescriptorSet* const		m_descriptorSets;
	const int								m_numDynamicOffsets;
	const deUint32* const					m_dynamicOffsets;
	const int								m_numPreBarriers;
	const vk::VkBufferMemoryBarrier* const	m_preBarriers;
	const int								m_numPostBarriers;
	const vk::VkBufferMemoryBarrier* const	m_postBarriers;
};

ComputeCommand::ComputeCommand (const vk::DeviceInterface&			vki,
								vk::VkDevice						device,
								vk::VkPipeline						pipeline,
								vk::VkPipelineLayout				pipelineLayout,
								const tcu::UVec3&					numWorkGroups,
								ShaderInputInterface				shaderInterface,
								DescriptorSetCount					descriptorSetCount,
								const vk::VkDescriptorSet*			descriptorSets,
								int									numDynamicOffsets,
								const deUint32*						dynamicOffsets,
								int									numPreBarriers,
								const vk::VkBufferMemoryBarrier*	preBarriers,
								int									numPostBarriers,
								const vk::VkBufferMemoryBarrier*	postBarriers)
	: m_vki					(vki)
	, m_device				(device)
	, m_pipeline			(pipeline)
	, m_pipelineLayout		(pipelineLayout)
	, m_numWorkGroups		(numWorkGroups)
	, m_shaderInterface		(shaderInterface)
	, m_descriptorSetCount	(descriptorSetCount)
	, m_descriptorSets		(descriptorSets)
	, m_numDynamicOffsets	(numDynamicOffsets)
	, m_dynamicOffsets		(dynamicOffsets)
	, m_numPreBarriers		(numPreBarriers)
	, m_preBarriers			(preBarriers)
	, m_numPostBarriers		(numPostBarriers)
	, m_postBarriers		(postBarriers)
{
}

void ComputeCommand::submitAndWait (deUint32 queueFamilyIndex, vk::VkQueue queue, std::vector<UpdateTemplateHandleSp>* updateTemplates, std::vector<RawUpdateRegistry>* updateRegistry) const
{
	const vk::VkCommandPoolCreateInfo				cmdPoolCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO,
		DE_NULL,
		vk::VK_COMMAND_POOL_CREATE_TRANSIENT_BIT,			// flags
		queueFamilyIndex,									// queueFamilyIndex
	};
	const vk::Unique<vk::VkCommandPool>				cmdPool				(vk::createCommandPool(m_vki, m_device, &cmdPoolCreateInfo));

	const vk::VkCommandBufferAllocateInfo			cmdBufCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,
		DE_NULL,
		*cmdPool,											// cmdPool
		vk::VK_COMMAND_BUFFER_LEVEL_PRIMARY,				// level
		1u,													// count
	};

	const vk::Unique<vk::VkCommandBuffer>			cmd					(vk::allocateCommandBuffer(m_vki, m_device, &cmdBufCreateInfo));

	beginCommandBuffer(m_vki, *cmd);

	m_vki.cmdBindPipeline(*cmd, vk::VK_PIPELINE_BIND_POINT_COMPUTE, m_pipeline);

	// normal update
	if (updateTemplates == DE_NULL)
	{
		switch (m_descriptorSetCount)
		{
			case DESCRIPTOR_SET_COUNT_SINGLE:
			case DESCRIPTOR_SET_COUNT_MULTIPLE:
			{
				m_vki.cmdBindDescriptorSets(*cmd, vk::VK_PIPELINE_BIND_POINT_COMPUTE, m_pipelineLayout, 0, getDescriptorSetCount(m_descriptorSetCount), m_descriptorSets, m_numDynamicOffsets, m_dynamicOffsets);
				break;
			}
			case DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS:
			{
				deUint32 dynamicOffsetNdx = 0u;

				for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
				{
					// \note dynamic offset replaces the view offset, i.e. it is not offset relative to the view offset
					const deUint32			numOffsets			= (!m_numDynamicOffsets) ? (0u) : (getInterfaceNumResources(m_shaderInterface));
					const deUint32* const	dynamicOffsetPtr	= (!m_numDynamicOffsets) ? (DE_NULL) : (&m_dynamicOffsets[dynamicOffsetNdx]);
					const deUint32			descriptorSetNdx	= getDescriptorSetNdx(m_descriptorSetCount, setNdx);

					m_vki.cmdBindDescriptorSets(*cmd, vk::VK_PIPELINE_BIND_POINT_COMPUTE, m_pipelineLayout, descriptorSetNdx, 1u, &m_descriptorSets[setNdx], numOffsets, dynamicOffsetPtr);

					dynamicOffsetNdx += getInterfaceNumResources(m_shaderInterface);
				}
				break;
			}
			default:
				DE_FATAL("Impossible");
		}
	}
	// update with push template
	else
	{
		for (deUint32 setNdx = 0; setNdx < (deUint32)(*updateTemplates).size(); setNdx++)
			m_vki.cmdPushDescriptorSetWithTemplateKHR(*cmd, **(*updateTemplates)[setNdx], m_pipelineLayout, getDescriptorSetNdx(m_descriptorSetCount, setNdx), (const void*)(*updateRegistry)[setNdx].getRawPointer());
	}

	if (m_numPreBarriers)
		m_vki.cmdPipelineBarrier(*cmd, vk::VK_PIPELINE_STAGE_HOST_BIT, vk::VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, (vk::VkDependencyFlags)0,
								 0, (const vk::VkMemoryBarrier*)DE_NULL,
								 m_numPreBarriers, m_preBarriers,
								 0, (const vk::VkImageMemoryBarrier*)DE_NULL);

	m_vki.cmdDispatch(*cmd, m_numWorkGroups.x(), m_numWorkGroups.y(), m_numWorkGroups.z());
	m_vki.cmdPipelineBarrier(*cmd, vk::VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, vk::VK_PIPELINE_STAGE_HOST_BIT, (vk::VkDependencyFlags)0,
							 0, (const vk::VkMemoryBarrier*)DE_NULL,
							 m_numPostBarriers, m_postBarriers,
							 0, (const vk::VkImageMemoryBarrier*)DE_NULL);
	endCommandBuffer(m_vki, *cmd);

	submitCommandsAndWait(m_vki, m_device, queue, cmd.get());
}

//cmdPushDescriptorSet variant
void ComputeCommand::submitAndWait (deUint32 queueFamilyIndex, vk::VkQueue queue, vk::DescriptorSetUpdateBuilder& updateBuilder, std::vector<deUint32>& descriptorsPerSet) const
{
	const vk::VkCommandPoolCreateInfo				cmdPoolCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO,
		DE_NULL,
		vk::VK_COMMAND_POOL_CREATE_TRANSIENT_BIT,			// flags
		queueFamilyIndex,									// queueFamilyIndex
	};
	const vk::Unique<vk::VkCommandPool>				cmdPool				(vk::createCommandPool(m_vki, m_device, &cmdPoolCreateInfo));

	const vk::Unique<vk::VkCommandBuffer>			cmd					(vk::allocateCommandBuffer(m_vki, m_device, *cmdPool, vk::VK_COMMAND_BUFFER_LEVEL_PRIMARY));

	beginCommandBuffer(m_vki, *cmd);

	m_vki.cmdBindPipeline(*cmd, vk::VK_PIPELINE_BIND_POINT_COMPUTE, m_pipeline);

	{
		deUint32 descriptorNdx = 0u;
		for (deUint32 setNdx = 0; setNdx < (deUint32)descriptorsPerSet.size(); setNdx++)
		{
			const deUint32 numDescriptors = descriptorsPerSet[setNdx];
			updateBuilder.updateWithPush(m_vki, *cmd, vk::VK_PIPELINE_BIND_POINT_COMPUTE, m_pipelineLayout, getDescriptorSetNdx(m_descriptorSetCount, setNdx), descriptorNdx, numDescriptors);
			descriptorNdx += numDescriptors;
		}
	}

	if (m_numPreBarriers)
		m_vki.cmdPipelineBarrier(*cmd, vk::VK_PIPELINE_STAGE_HOST_BIT, vk::VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, (vk::VkDependencyFlags)0,
								 0, (const vk::VkMemoryBarrier*)DE_NULL,
								 m_numPreBarriers, m_preBarriers,
								 0, (const vk::VkImageMemoryBarrier*)DE_NULL);

	m_vki.cmdDispatch(*cmd, m_numWorkGroups.x(), m_numWorkGroups.y(), m_numWorkGroups.z());
	m_vki.cmdPipelineBarrier(*cmd, vk::VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, vk::VK_PIPELINE_STAGE_HOST_BIT, (vk::VkDependencyFlags)0,
							 0, (const vk::VkMemoryBarrier*)DE_NULL,
							 m_numPostBarriers, m_postBarriers,
							 0, (const vk::VkImageMemoryBarrier*)DE_NULL);
	endCommandBuffer(m_vki, *cmd);

	submitCommandsAndWait(m_vki, m_device, queue, cmd.get());
}

class BufferComputeInstance : public vkt::TestInstance
{
public:
											BufferComputeInstance				(Context&						context,
																				 DescriptorUpdateMethod			updateMethod,
																				 vk::VkDescriptorType			descriptorType,
																				 DescriptorSetCount				descriptorSetCount,
																				 ShaderInputInterface			shaderInterface,
																				 bool							viewOffset,
																				 bool							dynamicOffset,
																				 bool							dynamicOffsetNonZero);

private:
	vk::Move<vk::VkBuffer>					createColorDataBuffer				(deUint32 offset, deUint32 bufferSize, const tcu::Vec4& value1, const tcu::Vec4& value2, de::MovePtr<vk::Allocation>* outAllocation);
	vk::Move<vk::VkDescriptorSetLayout>		createDescriptorSetLayout			(deUint32 setNdx) const;
	vk::Move<vk::VkDescriptorPool>			createDescriptorPool				(void) const;
	vk::Move<vk::VkDescriptorSet>			createDescriptorSet					(vk::VkDescriptorPool pool, vk::VkDescriptorSetLayout layout, deUint32 setNdx, vk::VkBuffer viewA, deUint32 offsetA, vk::VkBuffer viewB, deUint32 offsetB, vk::VkBuffer resBuf);
	void									writeDescriptorSet					(vk::VkDescriptorSet descriptorSet, deUint32 setNdx, vk::VkBuffer viewA, deUint32 offsetA, vk::VkBuffer viewB, deUint32 offsetB, vk::VkBuffer resBuf);
	void									writeDescriptorSetWithTemplate		(vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, vk::VkBuffer viewA, deUint32 offsetA, vk::VkBuffer viewB, deUint32 offsetB, vk::VkBuffer resBuf, bool withPush = false, vk::VkPipelineLayout pipelineLayout = DE_NULL);

	tcu::TestStatus							iterate								(void);
	void									logTestPlan							(void) const;
	tcu::TestStatus							testResourceAccess					(void);

	enum
	{
		STATIC_OFFSET_VALUE_A	= 256,
		DYNAMIC_OFFSET_VALUE_A	= 512,
		STATIC_OFFSET_VALUE_B	= 1024,
		DYNAMIC_OFFSET_VALUE_B	= 768,
	};

	const DescriptorUpdateMethod					m_updateMethod;
	const vk::VkDescriptorType						m_descriptorType;
	const DescriptorSetCount						m_descriptorSetCount;
	const ShaderInputInterface						m_shaderInterface;
	const bool										m_setViewOffset;
	const bool										m_setDynamicOffset;
	const bool										m_dynamicOffsetNonZero;

	std::vector<UpdateTemplateHandleSp>				m_updateTemplates;
	const vk::DeviceInterface&						m_vki;
	const vk::VkDevice								m_device;
	const vk::VkQueue								m_queue;
	const deUint32									m_queueFamilyIndex;
	vk::Allocator&									m_allocator;

	const ComputeInstanceResultBuffer				m_result;

	std::vector<RawUpdateRegistry>					m_updateRegistry;
	vk::DescriptorSetUpdateBuilder					m_updateBuilder;
	std::vector<deUint32>							m_descriptorsPerSet;
};

BufferComputeInstance::BufferComputeInstance (Context&						context,
											  DescriptorUpdateMethod		updateMethod,
											  vk::VkDescriptorType			descriptorType,
											  DescriptorSetCount			descriptorSetCount,
											  ShaderInputInterface			shaderInterface,
											  bool							viewOffset,
											  bool							dynamicOffset,
											  bool							dynamicOffsetNonZero)
	: vkt::TestInstance			(context)
	, m_updateMethod			(updateMethod)
	, m_descriptorType			(descriptorType)
	, m_descriptorSetCount		(descriptorSetCount)
	, m_shaderInterface			(shaderInterface)
	, m_setViewOffset			(viewOffset)
	, m_setDynamicOffset		(dynamicOffset)
	, m_dynamicOffsetNonZero	(dynamicOffsetNonZero)
	, m_updateTemplates			()
	, m_vki						(context.getDeviceInterface())
	, m_device					(context.getDevice())
	, m_queue					(context.getUniversalQueue())
	, m_queueFamilyIndex		(context.getUniversalQueueFamilyIndex())
	, m_allocator				(context.getDefaultAllocator())
	, m_result					(m_vki, m_device, m_allocator)
	, m_updateRegistry			()
	, m_updateBuilder			()
	, m_descriptorsPerSet		()
{
	if (m_dynamicOffsetNonZero)
		DE_ASSERT(m_setDynamicOffset);
}

vk::Move<vk::VkBuffer> BufferComputeInstance::createColorDataBuffer (deUint32 offset, deUint32 bufferSize, const tcu::Vec4& value1, const tcu::Vec4& value2, de::MovePtr<vk::Allocation>* outAllocation)
{
	DE_ASSERT(offset + sizeof(tcu::Vec4[2]) <= bufferSize);

	const bool						isUniformBuffer		= isUniformDescriptorType(m_descriptorType);
	const vk::VkBufferUsageFlags	usageFlags			= (isUniformBuffer) ? (vk::VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT) : (vk::VK_BUFFER_USAGE_STORAGE_BUFFER_BIT);
	const vk::VkBufferCreateInfo	createInfo =
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
		DE_NULL,
		0u,								// flags
		(vk::VkDeviceSize)bufferSize,	// size
		usageFlags,						// usage
		vk::VK_SHARING_MODE_EXCLUSIVE,	// sharingMode
		0u,								// queueFamilyCount
		DE_NULL,						// pQueueFamilyIndices
	};
	vk::Move<vk::VkBuffer>			buffer				(vk::createBuffer(m_vki, m_device, &createInfo));
	de::MovePtr<vk::Allocation>		allocation			(allocateAndBindObjectMemory(m_vki, m_device, m_allocator, *buffer, vk::MemoryRequirement::HostVisible));
	void*							mapPtr				= allocation->getHostPtr();

	if (offset)
		deMemset(mapPtr, 0x5A, (size_t)offset);
	deMemcpy((deUint8*)mapPtr + offset, value1.getPtr(), sizeof(tcu::Vec4));
	deMemcpy((deUint8*)mapPtr + offset + sizeof(tcu::Vec4), value2.getPtr(), sizeof(tcu::Vec4));
	deMemset((deUint8*)mapPtr + offset + 2 * sizeof(tcu::Vec4), 0x5A, (size_t)bufferSize - (size_t)offset - 2 * sizeof(tcu::Vec4));

	flushAlloc(m_vki, m_device, *allocation);

	*outAllocation = allocation;
	return buffer;
}

vk::Move<vk::VkDescriptorSetLayout> BufferComputeInstance::createDescriptorSetLayout (deUint32 setNdx) const
{
	vk::DescriptorSetLayoutBuilder			builder;
	vk::VkDescriptorSetLayoutCreateFlags	extraFlags	= 0;
	deUint32								binding		= 0;

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE ||
			m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		extraFlags |= vk::VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR;
	}

	if (setNdx == 0)
		builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++);

	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding + 0u);
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding + 2u);
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, getArbitraryBindingIndex(0));
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, getArbitraryBindingIndex(1));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			builder.addArrayBinding(m_descriptorType, 2u, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		default:
			DE_FATAL("Impossible");
	};

	return builder.build(m_vki, m_device, extraFlags);
}

vk::Move<vk::VkDescriptorPool> BufferComputeInstance::createDescriptorPool (void) const
{
	return vk::DescriptorPoolBuilder()
		.addType(vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER)
		.addType(m_descriptorType, getDescriptorSetCount(m_descriptorSetCount) * getInterfaceNumResources(m_shaderInterface))
		.build(m_vki, m_device, vk::VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, getDescriptorSetCount(m_descriptorSetCount));
}

vk::Move<vk::VkDescriptorSet> BufferComputeInstance::createDescriptorSet (vk::VkDescriptorPool pool, vk::VkDescriptorSetLayout layout, deUint32 setNdx, vk::VkBuffer viewA, deUint32 offsetA, vk::VkBuffer viewB, deUint32 offsetB, vk::VkBuffer resBuf)
{
	const vk::VkDescriptorSetAllocateInfo	allocInfo		=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
		DE_NULL,
		pool,
		1u,
		&layout
	};

	vk::Move<vk::VkDescriptorSet>			descriptorSet;
	if (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH && m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		descriptorSet = allocateDescriptorSet(m_vki, m_device, &allocInfo);
	}
	else
	{
		descriptorSet = vk::Move<vk::VkDescriptorSet>();
	}

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE)
	{
		writeDescriptorSetWithTemplate(*descriptorSet, layout, setNdx, viewA, offsetA, viewB, offsetB, resBuf);
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		writeDescriptorSet(*descriptorSet, setNdx, viewA, offsetA, viewB, offsetB, resBuf);
	}

	return descriptorSet;
}

void BufferComputeInstance::writeDescriptorSet (vk::VkDescriptorSet descriptorSet, deUint32 setNdx, vk::VkBuffer viewA, deUint32 offsetA, vk::VkBuffer viewB, deUint32 offsetB, vk::VkBuffer resBuf)
{
	const vk::VkDescriptorBufferInfo		resultInfo		= vk::makeDescriptorBufferInfo(resBuf, 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkDescriptorBufferInfo		bufferInfos[2]	=
	{
		vk::makeDescriptorBufferInfo(viewA, (vk::VkDeviceSize)offsetA, (vk::VkDeviceSize)sizeof(tcu::Vec4[2])),
		vk::makeDescriptorBufferInfo(viewB, (vk::VkDeviceSize)offsetB, (vk::VkDeviceSize)sizeof(tcu::Vec4[2])),
	};

	deUint32								numDescriptors	= 0u;
	deUint32								binding			= 0u;

	// result
	if (setNdx == 0)
	{
		m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, &resultInfo);
		numDescriptors++;
	}

	// buffers
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &bufferInfos[0]);
			numDescriptors++;
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &bufferInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &bufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding), m_descriptorType, &bufferInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding + 2), m_descriptorType, &bufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), m_descriptorType, &bufferInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), m_descriptorType, &bufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			m_updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, 2u, bufferInfos);
			numDescriptors++;
			break;

		default:
			DE_FATAL("Impossible");
	}

	m_descriptorsPerSet.push_back(numDescriptors);

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		m_updateBuilder.update(m_vki, m_device);
		m_updateBuilder.clear();
	}
}

void BufferComputeInstance::writeDescriptorSetWithTemplate (vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, vk::VkBuffer viewA, deUint32 offsetA, vk::VkBuffer viewB, deUint32 offsetB, vk::VkBuffer resBuf, bool withPush, vk::VkPipelineLayout pipelineLayout)
{
	const vk::VkDescriptorBufferInfo						resultInfo			= vk::makeDescriptorBufferInfo(resBuf, 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkDescriptorBufferInfo						bufferInfos[2]		=
	{
		vk::makeDescriptorBufferInfo(viewA, (vk::VkDeviceSize)offsetA, (vk::VkDeviceSize)sizeof(tcu::Vec4[2])),
		vk::makeDescriptorBufferInfo(viewB, (vk::VkDeviceSize)offsetB, (vk::VkDeviceSize)sizeof(tcu::Vec4[2])),
	};
	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// descriptorUpdateEntryCount
		DE_NULL,	// pDescriptorUpdateEntries
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_COMPUTE,
		pipelineLayout,
		setNdx
	};
	deUint32												binding				= 0u;
	deUint32												offset				= 0u;
	RawUpdateRegistry										updateRegistry;

	if (setNdx == 0)
		updateRegistry.addWriteObject(resultInfo);

	updateRegistry.addWriteObject(bufferInfos[0]);
	updateRegistry.addWriteObject(bufferInfos[1]);

	// result
	if (setNdx == 0)
		updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, updateRegistry.getWriteObjectOffset(offset++), 0));

	// buffers
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(binding, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(binding + 2, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 2, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), sizeof(bufferInfos[0])));
			break;

		default:
			DE_FATAL("Impossible");
	}

	templateCreateInfo.pDescriptorUpdateEntries			= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount		= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>			updateTemplate		 = vk::createDescriptorUpdateTemplate(m_vki, m_device, &templateCreateInfo);
	m_updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	m_updateRegistry.push_back(updateRegistry);

	if (!withPush)
	{
		m_vki.updateDescriptorSetWithTemplate(m_device, descriptorSet, **m_updateTemplates.back(), m_updateRegistry.back().getRawPointer());
	}
}

tcu::TestStatus BufferComputeInstance::iterate (void)
{
	logTestPlan();
	return testResourceAccess();
}

void BufferComputeInstance::logTestPlan (void) const
{
	std::ostringstream msg;

	msg << "Accessing resource in a compute program.\n"
		<< ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
		<< "Each descriptor set contains "
		<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
				(const char*)DE_NULL)
		<< " source descriptor(s) of type " << vk::getDescriptorTypeName(m_descriptorType)
		<< " and one destination VK_DESCRIPTOR_TYPE_STORAGE_BUFFER to store results to.\n"
		<< "Source descriptor buffer view(s) have " << ((m_setViewOffset) ? ("non-") : ("")) << "zero offset.\n";

	if (isDynamicDescriptorType(m_descriptorType))
	{
		if (m_setDynamicOffset)
		{
			msg << "Source buffer(s) are given a dynamic offset at bind time.\n"
				<< "The supplied dynamic offset is " << ((m_dynamicOffsetNonZero) ? ("non-") : ("")) << "zero.\n";
		}
		else
		{
			msg << "Dynamic offset is not supplied at bind time. Expecting bind to offset 0.\n";
		}
	}

	msg << "Destination buffer is pre-initialized to -1.\n";

	m_context.getTestContext().getLog()
		<< tcu::TestLog::Message
		<< msg.str()
		<< tcu::TestLog::EndMessage;
}

tcu::TestStatus BufferComputeInstance::testResourceAccess (void)
{
	enum
	{
		ADDRESSABLE_SIZE = 256, // allocate a lot more than required
	};

	const bool										isDynamicCase		= isDynamicDescriptorType(m_descriptorType);
	const bool										isUniformBuffer		= isUniformDescriptorType(m_descriptorType);

	const tcu::Vec4 color[] =
	{
		tcu::Vec4(0.0f, 1.0f, 0.0f, 1.0f),		// green
		tcu::Vec4(1.0f, 1.0f, 0.0f, 1.0f),		// yellow
		tcu::Vec4(0.0f, 0.0f, 1.0f, 1.0f),		// blue
		tcu::Vec4(1.0f, 0.0f, 0.0f, 1.0f),		// red
	};

	std::vector<deUint32>							bindTimeOffsets;
	std::vector<tcu::Vec4>							colors;
	std::vector<deUint32>							dataOffsets;
	std::vector<deUint32>							viewOffsets;
	std::vector<deUint32>							bufferSizes;
	std::vector<AllocationSp>						bufferMems;
	std::vector<BufferHandleSp>						buffers;

	for (deUint32 bufferNdx = 0; bufferNdx < getDescriptorSetCount(m_descriptorSetCount) * getInterfaceNumResources(m_shaderInterface); bufferNdx++)
	{
		const deUint32 staticOffsets[]	=
		{
			STATIC_OFFSET_VALUE_A,
			STATIC_OFFSET_VALUE_B
		};

		const deUint32 dynamicOffset[]	=
		{
			DYNAMIC_OFFSET_VALUE_A,
			DYNAMIC_OFFSET_VALUE_B
		};

		const deUint32	parity		= bufferNdx % 2;
		bindTimeOffsets.push_back((m_dynamicOffsetNonZero) ? (dynamicOffset[parity]) : (0u));

		const deUint32	dataOffset	= ((isDynamicCase) ? (bindTimeOffsets.back()) : 0) + ((m_setViewOffset) ? (staticOffsets[parity]) : (0u));
		const deUint32	viewOffset	= ((m_setViewOffset) ? (staticOffsets[parity]) : (0u));

		colors.push_back(color[bufferNdx % DE_LENGTH_OF_ARRAY(color)]);
		dataOffsets.push_back(dataOffset);
		viewOffsets.push_back(viewOffset);
		bufferSizes.push_back(dataOffsets.back() + ADDRESSABLE_SIZE);

		de::MovePtr<vk::Allocation>	bufferMem;
		vk::Move<vk::VkBuffer>		buffer		(createColorDataBuffer(dataOffsets.back(), bufferSizes.back(), color[(bufferNdx * 2) % DE_LENGTH_OF_ARRAY(color)], color[(bufferNdx * 2 + 1) % DE_LENGTH_OF_ARRAY(color)], &bufferMem));

		bufferMems.push_back(AllocationSp(bufferMem.release()));
		buffers.push_back(BufferHandleSp(new BufferHandleUp(buffer)));
	}

	const vk::Unique<vk::VkDescriptorPool>			descriptorPool(createDescriptorPool());
	std::vector<DescriptorSetLayoutHandleSp>		descriptorSetLayouts;
	std::vector<DescriptorSetHandleSp>				descriptorSets;
	std::vector<vk::VkDescriptorSetLayout>			layoutHandles;
	std::vector<vk::VkDescriptorSet>				setHandles;

	const deUint32									numSrcBuffers = getDescriptorSetCount(m_descriptorSetCount) * getInterfaceNumResources(m_shaderInterface);

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
	{
		const deUint32						ndx0	= (setNdx * getInterfaceNumResources(m_shaderInterface)) % numSrcBuffers;
		const deUint32						ndx1	= (setNdx * getInterfaceNumResources(m_shaderInterface) + 1) % numSrcBuffers;

		vk::Move<vk::VkDescriptorSetLayout>	layout	= createDescriptorSetLayout(setNdx);
		vk::Move<vk::VkDescriptorSet>		set		= createDescriptorSet(*descriptorPool, *layout, setNdx, **buffers[ndx0], viewOffsets[ndx0], **buffers[ndx1], viewOffsets[ndx1], m_result.getBuffer());

		descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(layout)));
		descriptorSets.push_back(DescriptorSetHandleSp(new DescriptorSetHandleUp(set)));

		layoutHandles.push_back(**descriptorSetLayouts.back());
		setHandles.push_back(**descriptorSets.back());

		// Add an empty descriptor set layout between sets 0 and 2
		if (setNdx == 0 && m_descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS)
		{
			vk::DescriptorSetLayoutBuilder		emptyBuilder;
			vk::Move<vk::VkDescriptorSetLayout>	emptyLayout = emptyBuilder.build(m_vki, m_device, (vk::VkDescriptorSetLayoutCreateFlags)0);

			descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(emptyLayout)));
			layoutHandles.push_back(**descriptorSetLayouts.back());
		}
	}

	const ComputePipeline							pipeline			(m_vki, m_device, m_context.getBinaryCollection(), (int)layoutHandles.size(), &layoutHandles.front());
	const vk::VkAccessFlags							inputBit			= (isUniformBuffer) ? (vk::VK_ACCESS_UNIFORM_READ_BIT) : (vk::VK_ACCESS_SHADER_READ_BIT);

	std::vector<vk::VkBufferMemoryBarrier>			bufferBarriers;

	for (deUint32 bufferNdx = 0; bufferNdx < numSrcBuffers; bufferNdx++)
	{
		const vk::VkBufferMemoryBarrier	barrier =
		{
			vk::VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
			DE_NULL,
			vk::VK_ACCESS_HOST_WRITE_BIT,				// srcAccessMask
			inputBit,									// dstAccessMask
			VK_QUEUE_FAMILY_IGNORED,					// srcQueueFamilyIndex
			VK_QUEUE_FAMILY_IGNORED,					// destQueueFamilyIndex
			**buffers[bufferNdx],						// buffer
			(vk::VkDeviceSize)0u,						// offset
			(vk::VkDeviceSize)bufferSizes[bufferNdx],	// size
		};

		bufferBarriers.push_back(barrier);
	}

	const deUint32* const							dynamicOffsets		= (m_setDynamicOffset) ? (&bindTimeOffsets.front()) : (DE_NULL);
	const deUint32									numDynamicOffsets	= (m_setDynamicOffset) ? (numSrcBuffers) : (0);
	const vk::VkBufferMemoryBarrier* const			preBarriers			= &bufferBarriers.front();
	const int										numPreBarriers		= numSrcBuffers;
	const vk::VkBufferMemoryBarrier* const			postBarriers		= m_result.getResultReadBarrier();
	const int										numPostBarriers		= 1;

	const ComputeCommand							compute				(m_vki,
																		 m_device,
																		 pipeline.getPipeline(),
																		 pipeline.getPipelineLayout(),
																		 tcu::UVec3(4, 1, 1),
																		 m_shaderInterface,
																		 m_descriptorSetCount,	&setHandles.front(),
																		 numDynamicOffsets,		dynamicOffsets,
																		 numPreBarriers,		preBarriers,
																		 numPostBarriers,		postBarriers);

	tcu::Vec4										refQuadrantValue14	= tcu::Vec4(0.0f);
	tcu::Vec4										refQuadrantValue23	= tcu::Vec4(0.0f);

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
	{
		deUint32 offset = (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? 1 : 3;
		refQuadrantValue14 += color[(2 * setNdx * getInterfaceNumResources(m_shaderInterface) + offset) % DE_LENGTH_OF_ARRAY(color)];
		refQuadrantValue23 += color[(2 * setNdx * getInterfaceNumResources(m_shaderInterface)) % DE_LENGTH_OF_ARRAY(color)];
	}

	refQuadrantValue14 = refQuadrantValue14 / tcu::Vec4((float)getDescriptorSetCount(m_descriptorSetCount));
	refQuadrantValue23 = refQuadrantValue23 / tcu::Vec4((float)getDescriptorSetCount(m_descriptorSetCount));

	const tcu::Vec4									references[4]		=
	{
		refQuadrantValue14,
		refQuadrantValue23,
		refQuadrantValue23,
		refQuadrantValue14,
	};
	tcu::Vec4										results[4];

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
		{
			const deUint32	ndx0 = (setNdx * getInterfaceNumResources(m_shaderInterface)) % numSrcBuffers;
			const deUint32	ndx1 = (setNdx * getInterfaceNumResources(m_shaderInterface) + 1) % numSrcBuffers;

			writeDescriptorSetWithTemplate(DE_NULL, layoutHandles[setNdx], setNdx, **buffers[ndx0], viewOffsets[ndx0], **buffers[ndx1], viewOffsets[ndx1], m_result.getBuffer(), true, pipeline.getPipelineLayout());
		}
		compute.submitAndWait(m_queueFamilyIndex, m_queue, &m_updateTemplates, &m_updateRegistry);
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
		{
			const deUint32	ndx0 = (setNdx * getInterfaceNumResources(m_shaderInterface)) % numSrcBuffers;
			const deUint32	ndx1 = (setNdx * getInterfaceNumResources(m_shaderInterface) + 1) % numSrcBuffers;

			writeDescriptorSet(DE_NULL, setNdx, **buffers[ndx0], viewOffsets[ndx0], **buffers[ndx1], viewOffsets[ndx1], m_result.getBuffer());
		}

		compute.submitAndWait(m_queueFamilyIndex, m_queue, m_updateBuilder, m_descriptorsPerSet);
	}
	else
	{
		compute.submitAndWait(m_queueFamilyIndex, m_queue);
	}
	m_result.readResultContentsTo(&results);

	// verify
	if (results[0] == references[0] &&
		results[1] == references[1] &&
		results[2] == references[2] &&
		results[3] == references[3])
	{
		return tcu::TestStatus::pass("Pass");
	}
	else if (results[0] == tcu::Vec4(-1.0f) &&
			 results[1] == tcu::Vec4(-1.0f) &&
			 results[2] == tcu::Vec4(-1.0f) &&
			 results[3] == tcu::Vec4(-1.0f))
	{
		m_context.getTestContext().getLog()
			<< tcu::TestLog::Message
			<< "Result buffer was not written to."
			<< tcu::TestLog::EndMessage;
		return tcu::TestStatus::fail("Result buffer was not written to");
	}
	else
	{
		m_context.getTestContext().getLog()
			<< tcu::TestLog::Message
			<< "Error expected ["
				<< references[0] << ", "
				<< references[1] << ", "
				<< references[2] << ", "
				<< references[3] << "], got ["
				<< results[0] << ", "
				<< results[1] << ", "
				<< results[2] << ", "
				<< results[3] << "]"
			<< tcu::TestLog::EndMessage;
		return tcu::TestStatus::fail("Invalid result values");
	}
}

class QuadrantRendederCase : public vkt::TestCase
{
public:
									QuadrantRendederCase		(tcu::TestContext&		testCtx,
																 const char*			name,
																 const char*			description,
																 glu::GLSLVersion		glslVersion,
																 vk::VkShaderStageFlags	exitingStages,
																 vk::VkShaderStageFlags	activeStages,
																 DescriptorSetCount		descriptorSetCount);
private:
	virtual std::string				genExtensionDeclarations	(vk::VkShaderStageFlagBits stage) const = 0;
	virtual std::string				genResourceDeclarations		(vk::VkShaderStageFlagBits stage, int numUsedBindings) const = 0;
	virtual std::string				genResourceAccessSource		(vk::VkShaderStageFlagBits stage) const = 0;
	virtual std::string				genNoAccessSource			(void) const = 0;

	std::string						genVertexSource				(void) const;
	std::string						genTessCtrlSource			(void) const;
	std::string						genTessEvalSource			(void) const;
	std::string						genGeometrySource			(void) const;
	std::string						genFragmentSource			(void) const;
	std::string						genComputeSource			(void) const;

	void							initPrograms				(vk::SourceCollections& programCollection) const;

protected:
	const glu::GLSLVersion			m_glslVersion;
	const vk::VkShaderStageFlags	m_exitingStages;
	const vk::VkShaderStageFlags	m_activeStages;
	const DescriptorSetCount		m_descriptorSetCount;
};

QuadrantRendederCase::QuadrantRendederCase (tcu::TestContext&		testCtx,
											const char*				name,
											const char*				description,
											glu::GLSLVersion		glslVersion,
											vk::VkShaderStageFlags	exitingStages,
											vk::VkShaderStageFlags	activeStages,
											DescriptorSetCount		descriptorSetCount)
	: vkt::TestCase			(testCtx, name, description)
	, m_glslVersion			(glslVersion)
	, m_exitingStages		(exitingStages)
	, m_activeStages		(activeStages)
	, m_descriptorSetCount	(descriptorSetCount)
{
	DE_ASSERT((m_exitingStages & m_activeStages) == m_activeStages);
}

std::string QuadrantRendederCase::genVertexSource (void) const
{
	const char* const	nextStageName	= ((m_exitingStages & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0u)	? ("tsc")
										: ((m_exitingStages & vk::VK_SHADER_STAGE_GEOMETRY_BIT) != 0u)				? ("geo")
										: ((m_exitingStages & vk::VK_SHADER_STAGE_FRAGMENT_BIT) != 0u)				? ("frag")
										: (DE_NULL);
	const char* const	fragColorPrec	= ((m_exitingStages & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0) ? "highp" : "mediump";
	const char* const	versionDecl		= glu::getGLSLVersionDeclaration(m_glslVersion);
	std::ostringstream	buf;

	if ((m_activeStages & vk::VK_SHADER_STAGE_VERTEX_BIT) != 0u)
	{
		const bool onlyVS = (m_activeStages == vk::VK_SHADER_STAGE_VERTEX_BIT);

		// active vertex shader
		buf << versionDecl << "\n"
			<< genExtensionDeclarations(vk::VK_SHADER_STAGE_VERTEX_BIT);
		buf	<< genResourceDeclarations(vk::VK_SHADER_STAGE_VERTEX_BIT, 0);
		buf	<< "layout(location = 0) out " << fragColorPrec << " vec4 " << nextStageName << "_color;\n"
			<< (onlyVS ? "" : "layout(location = 1) flat out highp int " + de::toString(nextStageName) + "_quadrant_id;\n")
			<< genPerVertexBlock(vk::VK_SHADER_STAGE_VERTEX_BIT, m_glslVersion)
			<< "void main (void)\n"
			<< "{\n"
			<< "	highp vec4 result_position;\n"
			<< "	highp int quadrant_id;\n"
			<< s_quadrantGenVertexPosSource
			<< "	gl_Position = result_position;\n"
			<< (onlyVS ? "" : "\t" + de::toString(nextStageName) + "_quadrant_id = quadrant_id;\n")
			<< "\n"
			<< "	highp vec4 result_color;\n"
			<< genResourceAccessSource(vk::VK_SHADER_STAGE_VERTEX_BIT)
			<< "	" << nextStageName << "_color = result_color;\n"
			<< "}\n";
	}
	else
	{
		// do nothing
		buf << versionDecl << "\n"
			<< genExtensionDeclarations(vk::VK_SHADER_STAGE_VERTEX_BIT)
			<< "layout(location = 1) flat out highp int " << nextStageName << "_quadrant_id;\n"
			<< genPerVertexBlock(vk::VK_SHADER_STAGE_VERTEX_BIT, m_glslVersion)
			<< "void main (void)\n"
			<< "{\n"
			<< "	highp vec4 result_position;\n"
			<< "	highp int quadrant_id;\n"
			<< s_quadrantGenVertexPosSource
			<< "	gl_Position = result_position;\n"
			<< "	" << nextStageName << "_quadrant_id = quadrant_id;\n"
			<< "}\n";
	}

	return buf.str();
}

std::string QuadrantRendederCase::genTessCtrlSource (void) const
{
	const char* const	versionDecl		= glu::getGLSLVersionDeclaration(m_glslVersion);
	const bool			extRequired		= glu::glslVersionIsES(m_glslVersion) && m_glslVersion <= glu::GLSL_VERSION_310_ES;
	const char* const	tessExtDecl		= extRequired ? "#extension GL_EXT_tessellation_shader : require\n" : "";
	std::ostringstream	buf;

	if ((m_activeStages & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0u)
	{
		// contributing not implemented
		DE_ASSERT(m_activeStages == vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT);

		// active tc shader
		buf << versionDecl << "\n"
			<< tessExtDecl
			<< genExtensionDeclarations(vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT)
			<< "layout(vertices=3) out;\n"
			<< genResourceDeclarations(vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT, 0)
			<< "layout(location = 1) flat in highp int tsc_quadrant_id[];\n"
			<< "layout(location = 0) out highp vec4 tes_color[];\n"
			<< genPerVertexBlock(vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT, m_glslVersion)
			<< "void main (void)\n"
			<< "{\n"
			<< "	highp vec4 result_color;\n"
			<< "	highp int quadrant_id = tsc_quadrant_id[gl_InvocationID];\n"
			<< genResourceAccessSource(vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT)
			<< "\n"
			<< "	tes_color[gl_InvocationID] = result_color;\n"
			<< "\n"
			<< "	// no dynamic input block indexing\n"
			<< "	highp vec4 position;\n"
			<< "	if (gl_InvocationID == 0)\n"
			<< "		position = gl_in[0].gl_Position;\n"
			<< "	else if (gl_InvocationID == 1)\n"
			<< "		position = gl_in[1].gl_Position;\n"
			<< "	else\n"
			<< "		position = gl_in[2].gl_Position;\n"
			<< "	gl_out[gl_InvocationID].gl_Position = position;\n"
			<< "	gl_TessLevelInner[0] = 2.8;\n"
			<< "	gl_TessLevelInner[1] = 2.8;\n"
			<< "	gl_TessLevelOuter[0] = 2.8;\n"
			<< "	gl_TessLevelOuter[1] = 2.8;\n"
			<< "	gl_TessLevelOuter[2] = 2.8;\n"
			<< "	gl_TessLevelOuter[3] = 2.8;\n"
			<< "}\n";
	}
	else if ((m_activeStages & vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT) != 0u)
	{
		// active te shader, tc passthru
		buf << versionDecl << "\n"
			<< tessExtDecl
			<< "layout(vertices=3) out;\n"
			<< "layout(location = 1) flat in highp int tsc_quadrant_id[];\n"
			<< "layout(location = 1) flat out highp int tes_quadrant_id[];\n"
			<< genPerVertexBlock(vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT, m_glslVersion)
			<< "void main (void)\n"
			<< "{\n"
			<< "	tes_quadrant_id[gl_InvocationID] = tsc_quadrant_id[0];\n"
			<< "\n"
			<< "	// no dynamic input block indexing\n"
			<< "	highp vec4 position;\n"
			<< "	if (gl_InvocationID == 0)\n"
			<< "		position = gl_in[0].gl_Position;\n"
			<< "	else if (gl_InvocationID == 1)\n"
			<< "		position = gl_in[1].gl_Position;\n"
			<< "	else\n"
			<< "		position = gl_in[2].gl_Position;\n"
			<< "	gl_out[gl_InvocationID].gl_Position = position;\n"
			<< "	gl_TessLevelInner[0] = 2.8;\n"
			<< "	gl_TessLevelInner[1] = 2.8;\n"
			<< "	gl_TessLevelOuter[0] = 2.8;\n"
			<< "	gl_TessLevelOuter[1] = 2.8;\n"
			<< "	gl_TessLevelOuter[2] = 2.8;\n"
			<< "	gl_TessLevelOuter[3] = 2.8;\n"
			<< "}\n";
	}
	else
	{
		// passthrough not implemented
		DE_FATAL("not implemented");
	}

	return buf.str();
}

std::string QuadrantRendederCase::genTessEvalSource (void) const
{
	const char* const	versionDecl		= glu::getGLSLVersionDeclaration(m_glslVersion);
	const bool			extRequired		= glu::glslVersionIsES(m_glslVersion) && m_glslVersion <= glu::GLSL_VERSION_310_ES;
	const char* const	tessExtDecl		= extRequired ? "#extension GL_EXT_tessellation_shader : require\n" : "";
	std::ostringstream	buf;

	if ((m_activeStages & vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT) != 0u)
	{
		// contributing not implemented
		DE_ASSERT(m_activeStages == vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT);

		// active te shader
		buf << versionDecl << "\n"
			<< tessExtDecl
			<< genExtensionDeclarations(vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT)
			<< "layout(triangles) in;\n"
			<< genResourceDeclarations(vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT, 0)
			<< "layout(location = 1) flat in highp int tes_quadrant_id[];\n"
			<< "layout(location = 0) out mediump vec4 frag_color;\n"
			<< genPerVertexBlock(vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT, m_glslVersion)
			<< "void main (void)\n"
			<< "{\n"
			<< "	highp vec4 result_color;\n"
			<< "	highp int quadrant_id = tes_quadrant_id[0];\n"
			<< genResourceAccessSource(vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT)
			<< "\n"
			<< "	frag_color = result_color;\n"
			<< "	gl_Position = gl_TessCoord.x * gl_in[0].gl_Position + gl_TessCoord.y * gl_in[1].gl_Position + gl_TessCoord.z * gl_in[2].gl_Position;\n"
			<< "}\n";
	}
	else if ((m_activeStages & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0u)
	{
		// contributing not implemented
		DE_ASSERT(m_activeStages == vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT);

		// active tc shader, te is passthru
		buf << versionDecl << "\n"
			<< tessExtDecl
			<< "layout(triangles) in;\n"
			<< "layout(location = 0) in highp vec4 tes_color[];\n"
			<< "layout(location = 0) out mediump vec4 frag_color;\n"
			<< genPerVertexBlock(vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT, m_glslVersion)
			<< "void main (void)\n"
			<< "{\n"
			<< "	frag_color = tes_color[0];\n"
			<< "	gl_Position = gl_TessCoord.x * gl_in[0].gl_Position + gl_TessCoord.y * gl_in[1].gl_Position + gl_TessCoord.z * gl_in[2].gl_Position;\n"
			<< "}\n";
	}
	else
	{
		// passthrough not implemented
		DE_FATAL("not implemented");
	}

	return buf.str();
}

std::string QuadrantRendederCase::genGeometrySource (void) const
{
	const char* const	versionDecl		= glu::getGLSLVersionDeclaration(m_glslVersion);
	const bool			extRequired		= glu::glslVersionIsES(m_glslVersion) && m_glslVersion <= glu::GLSL_VERSION_310_ES;
	const char* const	geomExtDecl		= extRequired ? "#extension GL_EXT_geometry_shader : require\n" : "";
	std::ostringstream	buf;

	if ((m_activeStages & vk::VK_SHADER_STAGE_GEOMETRY_BIT) != 0u)
	{
		// contributing not implemented
		DE_ASSERT(m_activeStages == vk::VK_SHADER_STAGE_GEOMETRY_BIT);

		// active geometry shader
		buf << versionDecl << "\n"
			<< geomExtDecl
			<< genExtensionDeclarations(vk::VK_SHADER_STAGE_GEOMETRY_BIT)
			<< "layout(triangles) in;\n"
			<< "layout(triangle_strip, max_vertices=4) out;\n"
			<< genResourceDeclarations(vk::VK_SHADER_STAGE_GEOMETRY_BIT, 0)
			<< "layout(location = 1) flat in highp int geo_quadrant_id[];\n"
			<< "layout(location = 0) out mediump vec4 frag_color;\n"
			<< genPerVertexBlock(vk::VK_SHADER_STAGE_GEOMETRY_BIT, m_glslVersion)
			<< "void main (void)\n"
			<< "{\n"
			<< "	highp int quadrant_id;\n"
			<< "	highp vec4 result_color;\n"
			<< "\n"
			<< "	quadrant_id = geo_quadrant_id[0];\n"
			<< genResourceAccessSource(vk::VK_SHADER_STAGE_GEOMETRY_BIT)
			<< "	frag_color = result_color;\n"
			<< "	gl_Position = gl_in[0].gl_Position;\n"
			<< "	EmitVertex();\n"
			<< "\n"
			<< "	quadrant_id = geo_quadrant_id[1];\n"
			<< genResourceAccessSource(vk::VK_SHADER_STAGE_GEOMETRY_BIT)
			<< "	frag_color = result_color;\n"
			<< "	gl_Position = gl_in[1].gl_Position;\n"
			<< "	EmitVertex();\n"
			<< "\n"
			<< "	quadrant_id = geo_quadrant_id[2];\n"
			<< genResourceAccessSource(vk::VK_SHADER_STAGE_GEOMETRY_BIT)
			<< "	frag_color = result_color;\n"
			<< "	gl_Position = gl_in[0].gl_Position * 0.5 + gl_in[2].gl_Position * 0.5;\n"
			<< "	EmitVertex();\n"
			<< "\n"
			<< "	quadrant_id = geo_quadrant_id[0];\n"
			<< genResourceAccessSource(vk::VK_SHADER_STAGE_GEOMETRY_BIT)
			<< "	frag_color = result_color;\n"
			<< "	gl_Position = gl_in[2].gl_Position;\n"
			<< "	EmitVertex();\n"
			<< "}\n";
	}
	else
	{
		// passthrough not implemented
		DE_FATAL("not implemented");
	}

	return buf.str();
}

std::string QuadrantRendederCase::genFragmentSource (void) const
{
	const char* const	versionDecl		= glu::getGLSLVersionDeclaration(m_glslVersion);
	std::ostringstream	buf;

	if ((m_activeStages & vk::VK_SHADER_STAGE_FRAGMENT_BIT) != 0u)
	{
		buf << versionDecl << "\n"
			<< genExtensionDeclarations(vk::VK_SHADER_STAGE_GEOMETRY_BIT)
			<< genResourceDeclarations(vk::VK_SHADER_STAGE_FRAGMENT_BIT, 0);

		if (m_activeStages != vk::VK_SHADER_STAGE_FRAGMENT_BIT)
		{
			// there are other stages, this is just a contributor
			buf << "layout(location = 0) in mediump vec4 frag_color;\n";
		}

		buf << "layout(location = 1) flat in highp int frag_quadrant_id;\n"
			<< "layout(location = 0) out mediump vec4 o_color;\n"
			<< "void main (void)\n"
			<< "{\n"
			<< "	highp int quadrant_id = frag_quadrant_id;\n"
			<< "	highp vec4 result_color;\n"
			<< genResourceAccessSource(vk::VK_SHADER_STAGE_FRAGMENT_BIT);

		if (m_activeStages != vk::VK_SHADER_STAGE_FRAGMENT_BIT)
		{
			// just contributor
			buf	<< "	if (frag_quadrant_id < 2)\n"
				<< "		o_color = result_color;\n"
				<< "	else\n"
				<< "		o_color = frag_color;\n";
		}
		else
			buf << "	o_color = result_color;\n";

		buf << "}\n";
	}
	else if (m_activeStages == 0u)
	{
		// special case, no active stages
		buf << versionDecl << "\n"
			<< "layout(location = 1) flat in highp int frag_quadrant_id;\n"
			<< "layout(location = 0) out mediump vec4 o_color;\n"
			<< "void main (void)\n"
			<< "{\n"
			<< "	highp int quadrant_id = frag_quadrant_id;\n"
			<< "	highp vec4 result_color;\n"
			<< genNoAccessSource()
			<< "	o_color = result_color;\n"
			<< "}\n";
	}
	else
	{
		// passthrough
		buf <<	versionDecl << "\n"
			<<	"layout(location = 0) in mediump vec4 frag_color;\n"
				"layout(location = 0) out mediump vec4 o_color;\n"
				"void main (void)\n"
				"{\n"
				"	o_color = frag_color;\n"
				"}\n";
	}

	return buf.str();
}

std::string QuadrantRendederCase::genComputeSource (void) const
{
	const char* const	versionDecl		= glu::getGLSLVersionDeclaration(m_glslVersion);
	std::ostringstream	buf;

	buf	<< versionDecl << "\n"
		<< genExtensionDeclarations(vk::VK_SHADER_STAGE_COMPUTE_BIT)
		<< "layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;\n"
		<< genResourceDeclarations(vk::VK_SHADER_STAGE_COMPUTE_BIT, 1)
		<< "layout(set = 0, binding = 0, std140) writeonly buffer OutBuf\n"
		<< "{\n"
		<< "	highp vec4 read_colors[4];\n"
		<< "} b_out;\n"
		<< "void main (void)\n"
		<< "{\n"
		<< "	highp int quadrant_id = int(gl_WorkGroupID.x);\n"
		<< "	highp vec4 result_color;\n"
		<< genResourceAccessSource(vk::VK_SHADER_STAGE_COMPUTE_BIT)
		<< "	b_out.read_colors[gl_WorkGroupID.x] = result_color;\n"
		<< "}\n";

	return buf.str();
}

void QuadrantRendederCase::initPrograms (vk::SourceCollections& programCollection) const
{
	if ((m_exitingStages & vk::VK_SHADER_STAGE_VERTEX_BIT) != 0u)
		programCollection.glslSources.add("vertex") << glu::VertexSource(genVertexSource());

	if ((m_exitingStages & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0u)
		programCollection.glslSources.add("tess_ctrl") << glu::TessellationControlSource(genTessCtrlSource());

	if ((m_exitingStages & vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT) != 0u)
		programCollection.glslSources.add("tess_eval") << glu::TessellationEvaluationSource(genTessEvalSource());

	if ((m_exitingStages & vk::VK_SHADER_STAGE_GEOMETRY_BIT) != 0u)
		programCollection.glslSources.add("geometry") << glu::GeometrySource(genGeometrySource());

	if ((m_exitingStages & vk::VK_SHADER_STAGE_FRAGMENT_BIT) != 0u)
		programCollection.glslSources.add("fragment") << glu::FragmentSource(genFragmentSource());

	if ((m_exitingStages & vk::VK_SHADER_STAGE_COMPUTE_BIT) != 0u)
		programCollection.glslSources.add("compute") << glu::ComputeSource(genComputeSource());
}

class BufferDescriptorCase : public QuadrantRendederCase
{
public:
	enum
	{
		FLAG_VIEW_OFFSET			= (1u << 1u),
		FLAG_DYNAMIC_OFFSET_ZERO	= (1u << 2u),
		FLAG_DYNAMIC_OFFSET_NONZERO	= (1u << 3u),
	};
	// enum continues where resource flags ends
	DE_STATIC_ASSERT((deUint32)FLAG_VIEW_OFFSET == (deUint32)RESOURCE_FLAG_LAST);

									BufferDescriptorCase		(tcu::TestContext&		testCtx,
																 DescriptorUpdateMethod	updateMethod,
																 const char*			name,
																 const char*			description,
																 bool					isPrimaryCmdBuf,
																 vk::VkDescriptorType	descriptorType,
																 vk::VkShaderStageFlags	exitingStages,
																 vk::VkShaderStageFlags	activeStages,
																 DescriptorSetCount		descriptorSetCount,
																 ShaderInputInterface	shaderInterface,
																 deUint32				flags);

private:
	std::string						genExtensionDeclarations	(vk::VkShaderStageFlagBits stage) const;
	std::string						genResourceDeclarations		(vk::VkShaderStageFlagBits stage, int numUsedBindings) const;
	std::string						genResourceAccessSource		(vk::VkShaderStageFlagBits stage) const;
	std::string						genNoAccessSource			(void) const;

	vkt::TestInstance*				createInstance				(vkt::Context& context) const;

	const DescriptorUpdateMethod	m_updateMethod;
	const bool						m_viewOffset;
	const bool						m_dynamicOffsetSet;
	const bool						m_dynamicOffsetNonZero;
	const bool						m_isPrimaryCmdBuf;
	const vk::VkDescriptorType		m_descriptorType;
	const DescriptorSetCount		m_descriptorSetCount;
	const ShaderInputInterface		m_shaderInterface;
};

BufferDescriptorCase::BufferDescriptorCase (tcu::TestContext&		testCtx,
											DescriptorUpdateMethod	updateMethod,
											const char*				name,
											const char*				description,
											bool					isPrimaryCmdBuf,
											vk::VkDescriptorType	descriptorType,
											vk::VkShaderStageFlags	exitingStages,
											vk::VkShaderStageFlags	activeStages,
											DescriptorSetCount		descriptorSetCount,
											ShaderInputInterface	shaderInterface,
											deUint32				flags)
	: QuadrantRendederCase		(testCtx, name, description, glu::GLSL_VERSION_310_ES, exitingStages, activeStages, descriptorSetCount)
	, m_updateMethod			(updateMethod)
	, m_viewOffset				((flags & FLAG_VIEW_OFFSET) != 0u)
	, m_dynamicOffsetSet		((flags & (FLAG_DYNAMIC_OFFSET_ZERO | FLAG_DYNAMIC_OFFSET_NONZERO)) != 0u)
	, m_dynamicOffsetNonZero	((flags & FLAG_DYNAMIC_OFFSET_NONZERO) != 0u)
	, m_isPrimaryCmdBuf			(isPrimaryCmdBuf)
	, m_descriptorType			(descriptorType)
	, m_descriptorSetCount		(descriptorSetCount)
	, m_shaderInterface			(shaderInterface)
{
}

std::string BufferDescriptorCase::genExtensionDeclarations (vk::VkShaderStageFlagBits stage) const
{
	DE_UNREF(stage);
	return "";
}

std::string BufferDescriptorCase::genResourceDeclarations (vk::VkShaderStageFlagBits stage, int numUsedBindings) const
{
	DE_UNREF(stage);

	const bool			isUniform		= isUniformDescriptorType(m_descriptorType);
	const char* const	storageType		= (isUniform) ? ("uniform") : ("buffer");
	const deUint32		numSets			= getDescriptorSetCount(m_descriptorSetCount);

	std::ostringstream	buf;

	for (deUint32 setNdx = 0; setNdx < numSets; setNdx++)
	{
		// Result buffer is bound only to the first descriptor set in compute shader cases
		const int			descBinding		= numUsedBindings - ((m_activeStages & vk::VK_SHADER_STAGE_COMPUTE_BIT) ? (setNdx == 0 ? 0 : 1) : 0);
		const std::string	setNdxPostfix	= (numSets == 1) ? "" : de::toString(setNdx);
		const deUint32		descriptorSet	= getDescriptorSetNdx(m_descriptorSetCount, setNdx);

		switch (m_shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				buf	<< "layout(set = " << descriptorSet << ", binding = " << (descBinding) << ", std140) " << storageType << " BufferName" << setNdxPostfix << "\n"
					<< "{\n"
					<< "	highp vec4 colorA;\n"
					<< "	highp vec4 colorB;\n"
					<< "} b_instance" << setNdxPostfix << ";\n";
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				buf	<< "layout(set = " << descriptorSet << ", binding = " << (descBinding) << ", std140) " << storageType << " BufferName" << setNdxPostfix << "A\n"
					<< "{\n"
					<< "	highp vec4 colorA;\n"
					<< "	highp vec4 colorB;\n"
					<< "} b_instance" << setNdxPostfix << "A;\n"
					<< "layout(set = " << descriptorSet << ", binding = " << (descBinding + 1) << ", std140) " << storageType << " BufferName" << setNdxPostfix << "B\n"
					<< "{\n"
					<< "	highp vec4 colorA;\n"
					<< "	highp vec4 colorB;\n"
					<< "} b_instance" << setNdxPostfix << "B;\n";
				break;

			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				buf	<< "layout(set = " << descriptorSet << ", binding = " << de::toString(descBinding) << ", std140) " << storageType << " BufferName" << setNdxPostfix << "A\n"
					<< "{\n"
					<< "	highp vec4 colorA;\n"
					<< "	highp vec4 colorB;\n"
					<< "} b_instance" << setNdxPostfix << "A;\n"
					<< "layout(set = " << descriptorSet << ", binding = " << de::toString(descBinding + 2) << ", std140) " << storageType << " BufferName" << setNdxPostfix << "B\n"
					<< "{\n"
					<< "	highp vec4 colorA;\n"
					<< "	highp vec4 colorB;\n"
					<< "} b_instance" << setNdxPostfix << "B;\n";
				break;

			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				buf	<< "layout(set = " << descriptorSet << ", binding = " << de::toString(getArbitraryBindingIndex(0)) << ", std140) " << storageType << " BufferName" << setNdxPostfix << "A\n"
					<< "{\n"
					<< "	highp vec4 colorA;\n"
					<< "	highp vec4 colorB;\n"
					<< "} b_instance" << setNdxPostfix << "A;\n"
					<< "layout(set = " << descriptorSet << ", binding = " << de::toString(getArbitraryBindingIndex(1)) << ", std140) " << storageType << " BufferName" << setNdxPostfix << "B\n"
					<< "{\n"
					<< "	highp vec4 colorA;\n"
					<< "	highp vec4 colorB;\n"
					<< "} b_instance" << setNdxPostfix << "B;\n";
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				buf	<< "layout(set = " << descriptorSet << ", binding = " << (descBinding) << ", std140) " << storageType << " BufferName" << setNdxPostfix << "\n"
					<< "{\n"
					<< "	highp vec4 colorA;\n"
					<< "	highp vec4 colorB;\n"
					<< "} b_instances" << setNdxPostfix << "[2];\n";
				break;

			default:
				DE_FATAL("Impossible");
		}
	}
	return buf.str();
}

std::string BufferDescriptorCase::genResourceAccessSource (vk::VkShaderStageFlagBits stage) const
{
	DE_UNREF(stage);

	const deUint32		numSets = getDescriptorSetCount(m_descriptorSetCount);
	std::ostringstream	buf;

	buf << "	result_color = vec4(0.0);\n";

	for (deUint32 setNdx = 0; setNdx < numSets; setNdx++)
	{
		const std::string	setNdxPostfix = (numSets == 1) ? "" : de::toString(setNdx);

		switch (m_shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				buf << "	if (quadrant_id == 1 || quadrant_id == 2)\n"
					<< "		result_color += b_instance" << setNdxPostfix << ".colorA;\n"
					<< "	else\n"
					<< "		result_color += b_instance" << setNdxPostfix << ".colorB;\n";
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				buf << "	if (quadrant_id == 1 || quadrant_id == 2)\n"
					<< "		result_color += b_instance" << setNdxPostfix << "A.colorA;\n"
					<< "	else\n"
					<< "		result_color += b_instance" << setNdxPostfix << "B.colorB;\n";
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				buf << "	if (quadrant_id == 1 || quadrant_id == 2)\n"
					<< "		result_color += b_instances" << setNdxPostfix << "[0].colorA;\n"
					<< "	else\n"
					<< "		result_color += b_instances" << setNdxPostfix << "[1].colorB;\n";
				break;

			default:
				DE_FATAL("Impossible");
		}
	}

	if (getDescriptorSetCount(m_descriptorSetCount) > 1)
		buf << "	result_color /= vec4(" << getDescriptorSetCount(m_descriptorSetCount) << ".0);\n";

	return buf.str();
}

std::string BufferDescriptorCase::genNoAccessSource (void) const
{
	return "	if (quadrant_id == 1 || quadrant_id == 2)\n"
		   "		result_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
		   "	else\n"
		   "		result_color = vec4(1.0, 1.0, 0.0, 1.0);\n";
}

vkt::TestInstance* BufferDescriptorCase::createInstance (vkt::Context& context) const
{
	verifyDriverSupport(context.getUsedApiVersion(), context.getDeviceFeatures(), context.getDeviceExtensions(), m_updateMethod, m_descriptorType, m_activeStages);

	if (m_exitingStages == vk::VK_SHADER_STAGE_COMPUTE_BIT)
	{
		DE_ASSERT(m_isPrimaryCmdBuf); // secondaries are only valid within renderpass
		return new BufferComputeInstance(context, m_updateMethod, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_viewOffset, m_dynamicOffsetSet, m_dynamicOffsetNonZero);
	}
	else
		return new BufferRenderInstance(context, m_updateMethod, m_isPrimaryCmdBuf, m_descriptorType, m_descriptorSetCount, m_activeStages, m_shaderInterface, m_viewOffset, m_dynamicOffsetSet, m_dynamicOffsetNonZero);
}

class ImageInstanceImages
{
public:
										ImageInstanceImages		(const vk::DeviceInterface&		vki,
																 vk::VkDevice					device,
																 deUint32						queueFamilyIndex,
																 vk::VkQueue					queue,
																 vk::Allocator&					allocator,
																 vk::VkDescriptorType			descriptorType,
																 vk::VkImageViewType			viewType,
																 int							numImages,
																 deUint32						baseMipLevel,
																 deUint32						baseArraySlice);

private:
	static std::vector<tcu::TextureLevelPyramid>	createSourceImages	(int											numImages,
																		 vk::VkImageViewType							viewType,
																		 tcu::TextureFormat								imageFormat);

	static std::vector<ImageHandleSp>				createImages		(const vk::DeviceInterface&						vki,
																		 vk::VkDevice									device,
																		 vk::Allocator&									allocator,
																		 deUint32										queueFamilyIndex,
																		 vk::VkQueue									queue,
																		 vk::VkDescriptorType							descriptorType,
																		 vk::VkImageViewType							viewType,
																		 std::vector<AllocationSp>&						imageMemory,
																		 const std::vector<tcu::TextureLevelPyramid>&	sourceImages);

	static std::vector<ImageViewHandleSp>			createImageViews	(const vk::DeviceInterface&						vki,
																		vk::VkDevice									device,
																		vk::VkImageViewType								viewType,
																		const std::vector<tcu::TextureLevelPyramid>&	sourceImages,
																		const std::vector<ImageHandleSp>&				images,
																		deUint32										baseMipLevel,
																		deUint32										baseArraySlice);

	static vk::Move<vk::VkImage>					createImage			(const vk::DeviceInterface&						vki,
																		 vk::VkDevice									device,
																		 vk::Allocator&									allocator,
																		 vk::VkDescriptorType							descriptorType,
																		 vk::VkImageViewType							viewType,
																		 const tcu::TextureLevelPyramid&				sourceImage,
																		 de::MovePtr<vk::Allocation>*					outAllocation);

	static vk::Move<vk::VkImageView>				createImageView		(const vk::DeviceInterface&						vki,
																		 vk::VkDevice									device,
																		 vk::VkImageViewType							viewType,
																		 const tcu::TextureLevelPyramid&				sourceImage,
																		 vk::VkImage									image,
																		 deUint32										baseMipLevel,
																		 deUint32										baseArraySlice);

	static void										populateSourceImage	(tcu::TextureLevelPyramid*						dst,
																		 vk::VkImageViewType							viewType,
																		 int											imageNdx);

	static void										uploadImage			(const vk::DeviceInterface&						vki,
																		 vk::VkDevice									device,
																		 deUint32										queueFamilyIndex,
																		 vk::VkQueue									queue,
																		 vk::Allocator&									allocator,
																		 vk::VkImage									image,
																		 vk::VkImageLayout								layout,
																		 vk::VkImageViewType							viewType,
																		 const tcu::TextureLevelPyramid&				data);

protected:
	enum
	{
		IMAGE_SIZE		= 64,
		NUM_MIP_LEVELS	= 2,
		ARRAY_SIZE		= 2,
	};

	const vk::VkImageViewType					m_viewType;
	const deUint32								m_baseMipLevel;
	const deUint32								m_baseArraySlice;
	const tcu::TextureFormat					m_imageFormat;
	const std::vector<tcu::TextureLevelPyramid>	m_sourceImage;
	std::vector<AllocationSp>					m_imageMemory;
	const std::vector<ImageHandleSp>			m_image;
	const std::vector<ImageViewHandleSp>		m_imageView;
};

ImageInstanceImages::ImageInstanceImages (const vk::DeviceInterface&	vki,
										  vk::VkDevice					device,
										  deUint32						queueFamilyIndex,
										  vk::VkQueue					queue,
										  vk::Allocator&				allocator,
										  vk::VkDescriptorType			descriptorType,
										  vk::VkImageViewType			viewType,
										  int							numImages,
										  deUint32						baseMipLevel,
										  deUint32						baseArraySlice)
	: m_viewType		(viewType)
	, m_baseMipLevel	(baseMipLevel)
	, m_baseArraySlice	(baseArraySlice)
	, m_imageFormat		(tcu::TextureFormat::RGBA, tcu::TextureFormat::UNORM_INT8)
	, m_sourceImage		(createSourceImages(numImages, viewType, m_imageFormat))
	, m_imageMemory		()
	, m_image			(createImages(vki, device, allocator, queueFamilyIndex, queue, descriptorType, viewType, m_imageMemory, m_sourceImage))
	, m_imageView		(createImageViews(vki, device, viewType, m_sourceImage, m_image, m_baseMipLevel, m_baseArraySlice))
{
}

std::vector<tcu::TextureLevelPyramid> ImageInstanceImages::createSourceImages (int					numImages,
																			   vk::VkImageViewType	viewType,
																			   tcu::TextureFormat	imageFormat)
{
	std::vector<tcu::TextureLevelPyramid> sourceImages(numImages, tcu::TextureLevelPyramid(imageFormat, NUM_MIP_LEVELS));

	for (int imageNdx = 0; imageNdx < numImages; imageNdx++)
		populateSourceImage(&sourceImages.at(imageNdx), viewType, imageNdx);

	return sourceImages;
}

std::vector<ImageHandleSp> ImageInstanceImages::createImages (const vk::DeviceInterface&					vki,
															  vk::VkDevice									device,
															  vk::Allocator&								allocator,
															  deUint32										queueFamilyIndex,
															  vk::VkQueue									queue,
															  vk::VkDescriptorType							descriptorType,
															  vk::VkImageViewType							viewType,
															  std::vector<AllocationSp>&					imageMemory,
															  const std::vector<tcu::TextureLevelPyramid>&	sourceImages)
{
	std::vector<ImageHandleSp>	images;
	const vk::VkImageLayout		layout	= getImageLayoutForDescriptorType(descriptorType);

	for (int imageNdx = 0; imageNdx < (int)sourceImages.size(); imageNdx++)
	{
		de::MovePtr<vk::Allocation>	memory;
		vk::Move<vk::VkImage>		image	= createImage(vki, device, allocator, descriptorType, viewType, sourceImages[imageNdx], &memory);

		uploadImage(vki, device, queueFamilyIndex, queue, allocator, *image, layout, viewType, sourceImages[imageNdx]);

		imageMemory.push_back(AllocationSp(memory.release()));
		images.push_back(ImageHandleSp(new ImageHandleUp(image)));
	}
	return images;
}

std::vector<ImageViewHandleSp> ImageInstanceImages::createImageViews (const vk::DeviceInterface&					vki,
																	  vk::VkDevice									device,
																	  vk::VkImageViewType							viewType,
																	  const std::vector<tcu::TextureLevelPyramid>&	sourceImages,
																	  const std::vector<ImageHandleSp>&				images,
																	  deUint32										baseMipLevel,
																	  deUint32										baseArraySlice)
{
	std::vector<ImageViewHandleSp> imageViews;
	for (int imageNdx = 0; imageNdx < (int)sourceImages.size(); imageNdx++)
	{
		vk::Move<vk::VkImageView> imageView = createImageView(vki, device, viewType, sourceImages[imageNdx], **images[imageNdx], baseMipLevel, baseArraySlice);
		imageViews.push_back(ImageViewHandleSp(new ImageViewHandleUp(imageView)));
	}
	return imageViews;
}

vk::Move<vk::VkImage> ImageInstanceImages::createImage (const vk::DeviceInterface&			vki,
														vk::VkDevice						device,
														vk::Allocator&						allocator,
														vk::VkDescriptorType				descriptorType,
														vk::VkImageViewType					viewType,
														const tcu::TextureLevelPyramid&		sourceImage,
														de::MovePtr<vk::Allocation>*		outAllocation)
{
	const tcu::ConstPixelBufferAccess	baseLevel	= sourceImage.getLevel(0);
	const bool							isCube		= (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE || viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY);
	const bool							isStorage	= (descriptorType == vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE);
	const deUint32						readUsage	= (isStorage) ? (vk::VK_IMAGE_USAGE_STORAGE_BIT) : (vk::VK_IMAGE_USAGE_SAMPLED_BIT);
	const deUint32						arraySize	= (viewType == vk::VK_IMAGE_VIEW_TYPE_1D || viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)		? (baseLevel.getHeight())
													: (viewType == vk::VK_IMAGE_VIEW_TYPE_2D || viewType == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY)		? (baseLevel.getDepth())
													: (viewType == vk::VK_IMAGE_VIEW_TYPE_3D)														? (1)
													: (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE || viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)	? (baseLevel.getDepth()) // cube: numFaces * numLayers
																																					: (0);
	const vk::VkExtent3D				extent		=
	{
		// x
		(deUint32)baseLevel.getWidth(),

		// y
		(viewType == vk::VK_IMAGE_VIEW_TYPE_1D || viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY) ? (1u) : (deUint32)baseLevel.getHeight(),

		// z
		(viewType == vk::VK_IMAGE_VIEW_TYPE_3D) ? ((deUint32)baseLevel.getDepth()) : (1u),
	};
	const vk::VkImageCreateInfo			createInfo	=
	{
		vk::VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
		DE_NULL,
		isCube ? (vk::VkImageCreateFlags)vk::VK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT : (vk::VkImageCreateFlags)0,
		viewTypeToImageType(viewType),											// imageType
		vk::mapTextureFormat(baseLevel.getFormat()),							// format
		extent,																	// extent
		(deUint32)sourceImage.getNumLevels(),									// mipLevels
		arraySize,																// arraySize
		vk::VK_SAMPLE_COUNT_1_BIT,												// samples
		vk::VK_IMAGE_TILING_OPTIMAL,											// tiling
		readUsage | vk::VK_IMAGE_USAGE_TRANSFER_DST_BIT,						// usage
		vk::VK_SHARING_MODE_EXCLUSIVE,											// sharingMode
		0u,																		// queueFamilyCount
		DE_NULL,																// pQueueFamilyIndices
		vk::VK_IMAGE_LAYOUT_UNDEFINED,											// initialLayout
	};
	vk::Move<vk::VkImage>				image		(vk::createImage(vki, device, &createInfo));

	*outAllocation = allocateAndBindObjectMemory(vki, device, allocator, *image, vk::MemoryRequirement::Any);
	return image;
}

vk::Move<vk::VkImageView> ImageInstanceImages::createImageView (const vk::DeviceInterface&			vki,
																vk::VkDevice						device,
																vk::VkImageViewType					viewType,
																const tcu::TextureLevelPyramid&		sourceImage,
																vk::VkImage							image,
																deUint32							baseMipLevel,
																deUint32							baseArraySlice)
{
	const tcu::ConstPixelBufferAccess	baseLevel			= sourceImage.getLevel(0);
	const deUint32						viewTypeBaseSlice	= (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE || viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY) ? (6 * baseArraySlice) : (baseArraySlice);
	const deUint32						viewArraySize		= (viewType == vk::VK_IMAGE_VIEW_TYPE_1D)			? (1)
															: (viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)		? (baseLevel.getHeight() - viewTypeBaseSlice)
															: (viewType == vk::VK_IMAGE_VIEW_TYPE_2D)			? (1)
															: (viewType == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY)		? (baseLevel.getDepth() - viewTypeBaseSlice)
															: (viewType == vk::VK_IMAGE_VIEW_TYPE_3D)			? (1)
															: (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE)			? (6)
															: (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)	? (baseLevel.getDepth() - viewTypeBaseSlice) // cube: numFaces * numLayers
																												: (0);

	DE_ASSERT(viewArraySize > 0);

	const vk::VkImageSubresourceRange	resourceRange	=
	{
		vk::VK_IMAGE_ASPECT_COLOR_BIT,					// aspectMask
		baseMipLevel,									// baseMipLevel
		sourceImage.getNumLevels() - baseMipLevel,		// mipLevels
		viewTypeBaseSlice,								// baseArraySlice
		viewArraySize,									// arraySize
	};
	const vk::VkImageViewCreateInfo		createInfo		=
	{
		vk::VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
		DE_NULL,
		(vk::VkImageViewCreateFlags)0,
		image,											// image
		viewType,										// viewType
		vk::mapTextureFormat(baseLevel.getFormat()),	// format
		{
			vk::VK_COMPONENT_SWIZZLE_R,
			vk::VK_COMPONENT_SWIZZLE_G,
			vk::VK_COMPONENT_SWIZZLE_B,
			vk::VK_COMPONENT_SWIZZLE_A
		},												// channels
		resourceRange,									// subresourceRange
	};
	return vk::createImageView(vki, device, &createInfo);
}

void ImageInstanceImages::populateSourceImage (tcu::TextureLevelPyramid* dst, vk::VkImageViewType viewType, int imageNdx)
{
	const int numLevels = dst->getNumLevels();

	for (int level = 0; level < numLevels; ++level)
	{
		const int	width	= IMAGE_SIZE >> level;
		const int	height	= (viewType == vk::VK_IMAGE_VIEW_TYPE_1D	|| viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)		? (ARRAY_SIZE)
																															: (IMAGE_SIZE >> level);
		const int	depth	= (viewType == vk::VK_IMAGE_VIEW_TYPE_1D	|| viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)		? (1)
							: (viewType == vk::VK_IMAGE_VIEW_TYPE_2D	|| viewType == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY)		? (ARRAY_SIZE)
							: (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE	|| viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)	? (6 * ARRAY_SIZE)
							: (viewType == vk::VK_IMAGE_VIEW_TYPE_3D)														? (IMAGE_SIZE >> level)
																															: (1);

		dst->allocLevel(level, width, height, depth);

		{
			const tcu::PixelBufferAccess levelAccess = dst->getLevel(level);

			for (int z = 0; z < depth; ++z)
			for (int y = 0; y < height; ++y)
			for (int x = 0; x < width; ++x)
			{
				const int	gradPos	= x + y + z;
				const int	gradMax	= width + height + depth - 3;

				int			red		= 255 * gradPos / gradMax;													//!< gradient from 0 -> max (detects large offset errors)
				int			green	= ((gradPos % 2 == 0) ? (127) : (0)) + ((gradPos % 4 < 3) ? (128) : (0));	//!< 3-level M pattern (detects small offset errors)
				int			blue	= (128 * level / numLevels) + ((imageNdx % 2 == 0) ? 127 : 0);				//!< level and image index (detects incorrect lod / image)

				DE_ASSERT(de::inRange(red, 0, 255));
				DE_ASSERT(de::inRange(green, 0, 255));
				DE_ASSERT(de::inRange(blue, 0, 255));

				if (imageNdx % 3 == 0)	red		= 255 - red;
				if (imageNdx % 4 == 0)	green	= 255 - green;
				if (imageNdx % 5 == 0)	blue	= 255 - blue;

				levelAccess.setPixel(tcu::IVec4(red, green, blue, 255), x, y, z);
			}
		}
	}
}

void ImageInstanceImages::uploadImage (const vk::DeviceInterface&		vki,
									   vk::VkDevice						device,
									   deUint32							queueFamilyIndex,
									   vk::VkQueue						queue,
									   vk::Allocator&					allocator,
									   vk::VkImage						image,
									   vk::VkImageLayout				layout,
									   vk::VkImageViewType				viewType,
									   const tcu::TextureLevelPyramid&	data)
{
	const deUint32						arraySize					= (viewType == vk::VK_IMAGE_VIEW_TYPE_3D) ? (1) :
																	  (viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE || viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY) ? (6 * (deUint32)ARRAY_SIZE) :
																	  ((deUint32)ARRAY_SIZE);
	const deUint32						dataBufferSize				= getTextureLevelPyramidDataSize(data);
	const vk::VkBufferCreateInfo		bufferCreateInfo			=
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
		DE_NULL,
		0u,													// flags
		dataBufferSize,										// size
		vk::VK_BUFFER_USAGE_TRANSFER_SRC_BIT,				// usage
		vk::VK_SHARING_MODE_EXCLUSIVE,						// sharingMode
		0u,													// queueFamilyCount
		DE_NULL,											// pQueueFamilyIndices
	};

	const vk::Unique<vk::VkBuffer>		dataBuffer					(vk::createBuffer(vki, device, &bufferCreateInfo));
	const de::MovePtr<vk::Allocation>	dataBufferMemory			= allocateAndBindObjectMemory(vki, device, allocator, *dataBuffer, vk::MemoryRequirement::HostVisible);
	std::vector<vk::VkBufferImageCopy>	copySlices;
	// copy data to buffer
	writeTextureLevelPyramidData(dataBufferMemory->getHostPtr(), dataBufferSize, data, viewType , &copySlices);
	flushAlloc(vki, device, *dataBufferMemory);

	// copy buffer to image
	copyBufferToImage(vki, device, queue, queueFamilyIndex, *dataBuffer, dataBufferSize, copySlices, DE_NULL, vk::VK_IMAGE_ASPECT_COLOR_BIT, data.getNumLevels(), arraySize, image, layout);
}

class ImageFetchInstanceImages : private ImageInstanceImages
{
public:
										ImageFetchInstanceImages	(const vk::DeviceInterface&		vki,
																	 vk::VkDevice					device,
																	 deUint32						queueFamilyIndex,
																	 vk::VkQueue					queue,
																	 vk::Allocator&					allocator,
																	 vk::VkDescriptorType			descriptorType,
																	 DescriptorSetCount				descriptorSetCount,
																	 ShaderInputInterface			shaderInterface,
																	 vk::VkImageViewType			viewType,
																	 deUint32						baseMipLevel,
																	 deUint32						baseArraySlice);

	static tcu::IVec3					getFetchPos					(vk::VkImageViewType			viewType,
																	 deUint32						baseMipLevel,
																	 deUint32						baseArraySlice,
																	 int							fetchPosNdx);

	tcu::Vec4							fetchImageValue				(int fetchPosNdx, int setNdx) const;

	inline tcu::TextureLevelPyramid		getSourceImage				(int ndx) const	{ return m_sourceImage[ndx];	}
	inline vk::VkImageView				getImageView				(int ndx) const	{ return **m_imageView[ndx % m_imageView.size()]; }

private:
	enum
	{
		// some arbitrary sample points for all four quadrants
		SAMPLE_POINT_0_X = 6,
		SAMPLE_POINT_0_Y = 13,
		SAMPLE_POINT_0_Z = 49,

		SAMPLE_POINT_1_X = 51,
		SAMPLE_POINT_1_Y = 40,
		SAMPLE_POINT_1_Z = 44,

		SAMPLE_POINT_2_X = 42,
		SAMPLE_POINT_2_Y = 26,
		SAMPLE_POINT_2_Z = 19,

		SAMPLE_POINT_3_X = 25,
		SAMPLE_POINT_3_Y = 25,
		SAMPLE_POINT_3_Z = 18,
	};

	const ShaderInputInterface	m_shaderInterface;
};

ImageFetchInstanceImages::ImageFetchInstanceImages (const vk::DeviceInterface&	vki,
													vk::VkDevice				device,
													deUint32					queueFamilyIndex,
													vk::VkQueue					queue,
													vk::Allocator&				allocator,
													vk::VkDescriptorType		descriptorType,
													DescriptorSetCount			descriptorSetCount,
													ShaderInputInterface		shaderInterface,
													vk::VkImageViewType			viewType,
													deUint32					baseMipLevel,
													deUint32					baseArraySlice)
	: ImageInstanceImages	(vki,
							 device,
							 queueFamilyIndex,
							 queue,
							 allocator,
							 descriptorType,
							 viewType,
							 getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface),	// numImages
							 baseMipLevel,
							 baseArraySlice)
	, m_shaderInterface		(shaderInterface)
{
}

bool isImageViewTypeArray (vk::VkImageViewType type)
{
	return type == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY || type == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY || type == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY;
}

tcu::IVec3 ImageFetchInstanceImages::getFetchPos (vk::VkImageViewType viewType, deUint32 baseMipLevel, deUint32 baseArraySlice, int fetchPosNdx)
{
	const tcu::IVec3	fetchPositions[4]	=
	{
		tcu::IVec3(SAMPLE_POINT_0_X, SAMPLE_POINT_0_Y, SAMPLE_POINT_0_Z),
		tcu::IVec3(SAMPLE_POINT_1_X, SAMPLE_POINT_1_Y, SAMPLE_POINT_1_Z),
		tcu::IVec3(SAMPLE_POINT_2_X, SAMPLE_POINT_2_Y, SAMPLE_POINT_2_Z),
		tcu::IVec3(SAMPLE_POINT_3_X, SAMPLE_POINT_3_Y, SAMPLE_POINT_3_Z),
	};
	const tcu::IVec3	coord				= de::getSizedArrayElement<4>(fetchPositions, fetchPosNdx);
	const deUint32		imageSize			= (deUint32)IMAGE_SIZE >> baseMipLevel;
	const deUint32		arraySize			= isImageViewTypeArray(viewType) ? ARRAY_SIZE - baseArraySlice : 1;

	switch (viewType)
	{
		case vk::VK_IMAGE_VIEW_TYPE_1D:
		case vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY:	return tcu::IVec3(coord.x() % imageSize, coord.y() % arraySize, 0);
		case vk::VK_IMAGE_VIEW_TYPE_2D:
		case vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY:	return tcu::IVec3(coord.x() % imageSize, coord.y() % imageSize, coord.z() % arraySize);
		case vk::VK_IMAGE_VIEW_TYPE_CUBE:
		case vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY:	return tcu::IVec3(coord.x() % imageSize, coord.y() % imageSize, coord.z() % (arraySize * 6));
		case vk::VK_IMAGE_VIEW_TYPE_3D:			return tcu::IVec3(coord.x() % imageSize, coord.y() % imageSize, coord.z() % imageSize);
		default:
			DE_FATAL("Impossible");
			return tcu::IVec3();
	}
}

tcu::Vec4 ImageFetchInstanceImages::fetchImageValue (int fetchPosNdx, int setNdx) const
{
	DE_ASSERT(de::inBounds(fetchPosNdx, 0, 4));

	const tcu::TextureLevelPyramid&	fetchSrcA	= getSourceImage(setNdx * getInterfaceNumResources(m_shaderInterface));
	const tcu::TextureLevelPyramid&	fetchSrcB	= (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? fetchSrcA : getSourceImage(setNdx * getInterfaceNumResources(m_shaderInterface) + 1);
	const tcu::TextureLevelPyramid&	fetchSrc	= ((fetchPosNdx % 2) == 0) ? (fetchSrcA) : (fetchSrcB); // sampling order is ABAB
	tcu::IVec3						fetchPos	= getFetchPos(m_viewType, m_baseMipLevel, m_baseArraySlice, fetchPosNdx);

	// add base array layer into the appropriate coordinate, based on the view type
	if (m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE || m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)
		fetchPos.z() += 6 * m_baseArraySlice;
	else if (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D || m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)
		fetchPos.y() += m_baseArraySlice;
	else
		fetchPos.z() += m_baseArraySlice;

	return fetchSrc.getLevel(m_baseMipLevel).getPixel(fetchPos.x(), fetchPos.y(), fetchPos.z());
}

class ImageFetchRenderInstance : public SingleCmdRenderInstance
{
public:
													ImageFetchRenderInstance		(vkt::Context&									context,
																					 DescriptorUpdateMethod							updateMethod,
																					 bool											isPrimaryCmdBuf,
																					 vk::VkDescriptorType							descriptorType,
																					 DescriptorSetCount								descriptorSetCount,
																					 vk::VkShaderStageFlags							stageFlags,
																					 ShaderInputInterface							shaderInterface,
																					 vk::VkImageViewType							viewType,
																					 deUint32										baseMipLevel,
																					 deUint32										baseArraySlice);

private:
	static std::vector<DescriptorSetLayoutHandleSp>	createDescriptorSetLayouts		(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 vk::VkShaderStageFlags								stageFlags,
																					 DescriptorUpdateMethod								updateMethod);

	static vk::Move<vk::VkPipelineLayout>			createPipelineLayout			(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayout);

	static vk::Move<vk::VkDescriptorPool>			createDescriptorPool			(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface);

	static std::vector<DescriptorSetHandleSp>		createDescriptorSets			(const vk::DeviceInterface&							vki,
																					 DescriptorUpdateMethod								updateMethod,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayouts,
																					 vk::VkDescriptorPool								pool,
																					 const ImageFetchInstanceImages&					images,
																					 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																				     std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																				     std::vector<RawUpdateRegistry>&					updateRegistry,
																					 std::vector<deUint32>&								descriptorsPerSet,
																					 vk::VkPipelineLayout								pipelineLayout = DE_NULL);

	static void										writeDescriptorSet				(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 ShaderInputInterface								shaderInterface,
																					 vk::VkDescriptorSetLayout							layout,
																					 vk::VkDescriptorPool								pool,
																					 vk::VkImageView									viewA,
																					 vk::VkImageView									viewB,
																					 vk::VkDescriptorSet								descriptorSet,
																					 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																					 std::vector<deUint32>&								descriptorsPerSet,
																					 DescriptorUpdateMethod								updateMethod = DESCRIPTOR_UPDATE_METHOD_NORMAL);

	static void										writeDescriptorSetWithTemplate	(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 ShaderInputInterface								shaderInterface,
																					 vk::VkDescriptorSetLayout							layout,
																					 vk::VkDescriptorPool								pool,
																					 vk::VkImageView									viewA,
																					 vk::VkImageView									viewB,
																					 vk::VkDescriptorSet								descriptorSet,
																				     std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																				     std::vector<RawUpdateRegistry>&					registry,
																					 bool												withPush = false,
																					 vk::VkPipelineLayout								pipelineLayout = 0);

	void											logTestPlan						(void) const;
	vk::VkPipelineLayout							getPipelineLayout				(void) const;
	void											writeDrawCmdBuffer				(vk::VkCommandBuffer cmd) const;
	tcu::TestStatus									verifyResultImage				(const tcu::ConstPixelBufferAccess& result) const;

	enum
	{
		RENDER_SIZE = 128,
	};

	const DescriptorUpdateMethod					m_updateMethod;
	const vk::VkDescriptorType						m_descriptorType;
	const DescriptorSetCount						m_descriptorSetCount;
	const vk::VkShaderStageFlags					m_stageFlags;
	const ShaderInputInterface						m_shaderInterface;
	const vk::VkImageViewType						m_viewType;
	const deUint32									m_baseMipLevel;
	const deUint32									m_baseArraySlice;

	std::vector<UpdateTemplateHandleSp>				m_updateTemplates;
	std::vector<RawUpdateRegistry>					m_updateRegistry;
	vk::DescriptorSetUpdateBuilder					m_updateBuilder;
	const std::vector<DescriptorSetLayoutHandleSp>	m_descriptorSetLayouts;
	const vk::Unique<vk::VkPipelineLayout>			m_pipelineLayout;
	const ImageFetchInstanceImages					m_images;
	const vk::Unique<vk::VkDescriptorPool>			m_descriptorPool;
	std::vector<deUint32>							m_descriptorsPerSet;
	const std::vector<DescriptorSetHandleSp>		m_descriptorSets;
};

ImageFetchRenderInstance::ImageFetchRenderInstance	(vkt::Context&			context,
													 DescriptorUpdateMethod	updateMethod,
													 bool					isPrimaryCmdBuf,
													 vk::VkDescriptorType	descriptorType,
													 DescriptorSetCount		descriptorSetCount,
													 vk::VkShaderStageFlags	stageFlags,
													 ShaderInputInterface	shaderInterface,
													 vk::VkImageViewType	viewType,
													 deUint32				baseMipLevel,
													 deUint32				baseArraySlice)
	: SingleCmdRenderInstance	(context, isPrimaryCmdBuf, tcu::UVec2(RENDER_SIZE, RENDER_SIZE))
	, m_updateMethod			(updateMethod)
	, m_descriptorType			(descriptorType)
	, m_descriptorSetCount		(descriptorSetCount)
	, m_stageFlags				(stageFlags)
	, m_shaderInterface			(shaderInterface)
	, m_viewType				(viewType)
	, m_baseMipLevel			(baseMipLevel)
	, m_baseArraySlice			(baseArraySlice)
	, m_updateTemplates			()
	, m_updateRegistry			()
	, m_updateBuilder			()
	, m_descriptorSetLayouts	(createDescriptorSetLayouts(m_vki, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_stageFlags, m_updateMethod))
	, m_pipelineLayout			(createPipelineLayout(m_vki, m_device, m_descriptorSetLayouts))
	, m_images					(m_vki, m_device, m_queueFamilyIndex, m_queue, m_allocator, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_viewType, m_baseMipLevel, m_baseArraySlice)
	, m_descriptorPool			(createDescriptorPool(m_vki, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface))
	, m_descriptorsPerSet		()
	, m_descriptorSets			(createDescriptorSets(m_vki, m_updateMethod, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_descriptorSetLayouts, *m_descriptorPool, m_images, m_updateBuilder, m_updateTemplates, m_updateRegistry, m_descriptorsPerSet, *m_pipelineLayout))
{
}

std::vector<DescriptorSetLayoutHandleSp> ImageFetchRenderInstance::createDescriptorSetLayouts (const vk::DeviceInterface&	vki,
																							   vk::VkDevice					device,
																							   vk::VkDescriptorType			descriptorType,
																							   DescriptorSetCount			descriptorSetCount,
																							   ShaderInputInterface			shaderInterface,
																							   vk::VkShaderStageFlags		stageFlags,
																							   DescriptorUpdateMethod		updateMethod)
{
	std::vector<DescriptorSetLayoutHandleSp>	descriptorSetLayouts;
	vk::VkDescriptorSetLayoutCreateFlags		extraFlags = 0;

	if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE ||
		updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		extraFlags |= vk::VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR;
	}

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		vk::DescriptorSetLayoutBuilder builder;

		switch (shaderInterface)
		{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			builder.addSingleBinding(descriptorType, stageFlags);
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			builder.addSingleBinding(descriptorType, stageFlags);
			builder.addSingleBinding(descriptorType, stageFlags);
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			builder.addSingleIndexedBinding(descriptorType, stageFlags, 0u);
			builder.addSingleIndexedBinding(descriptorType, stageFlags, 2u);
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			builder.addSingleIndexedBinding(descriptorType, stageFlags, getArbitraryBindingIndex(0));
			builder.addSingleIndexedBinding(descriptorType, stageFlags, getArbitraryBindingIndex(1));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			builder.addArrayBinding(descriptorType, 2u, stageFlags);
			break;

		default:
			DE_FATAL("Impossible");
		}

		vk::Move<vk::VkDescriptorSetLayout> layout = builder.build(vki, device, extraFlags);
		descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(layout)));

		// Add an empty descriptor set layout between sets 0 and 2
		if (setNdx == 0 && descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS)
		{
			vk::DescriptorSetLayoutBuilder		emptyBuilder;
			vk::Move<vk::VkDescriptorSetLayout>	emptyLayout = emptyBuilder.build(vki, device, (vk::VkDescriptorSetLayoutCreateFlags)0);
			descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(emptyLayout)));
		}
	}
	return descriptorSetLayouts;
}

vk::Move<vk::VkPipelineLayout> ImageFetchRenderInstance::createPipelineLayout (const vk::DeviceInterface&						vki,
																			   vk::VkDevice										device,
																			   const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayout)
{
	std::vector<vk::VkDescriptorSetLayout> layoutHandles;
	for (size_t setNdx = 0; setNdx < descriptorSetLayout.size(); setNdx++)
		layoutHandles.push_back(**descriptorSetLayout[setNdx]);

	const vk::VkPipelineLayoutCreateInfo createInfo =
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineLayoutCreateFlags)0,
		(deUint32)layoutHandles.size(),		// descriptorSetCount
		&layoutHandles.front(),				// pSetLayouts
		0u,									// pushConstantRangeCount
		DE_NULL,							// pPushConstantRanges
	};
	return vk::createPipelineLayout(vki, device, &createInfo);
}

vk::Move<vk::VkDescriptorPool> ImageFetchRenderInstance::createDescriptorPool (const vk::DeviceInterface&	vki,
																			   vk::VkDevice					device,
																			   vk::VkDescriptorType			descriptorType,
																			   DescriptorSetCount			descriptorSetCount,
																			   ShaderInputInterface			shaderInterface)
{
	return vk::DescriptorPoolBuilder()
		.addType(descriptorType, getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface))
		.build(vki, device, vk::VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, getDescriptorSetCount(descriptorSetCount));
}

std::vector<DescriptorSetHandleSp> ImageFetchRenderInstance::createDescriptorSets (const vk::DeviceInterface&						vki,
																				   DescriptorUpdateMethod							updateMethod,
																				   vk::VkDevice										device,
																				   vk::VkDescriptorType								descriptorType,
																				   DescriptorSetCount								descriptorSetCount,
																				   ShaderInputInterface								shaderInterface,
																				   const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayouts,
																				   vk::VkDescriptorPool								pool,
																				   const ImageFetchInstanceImages&					images,
																				   vk::DescriptorSetUpdateBuilder&					updateBuilder,
																				   std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																				   std::vector<RawUpdateRegistry>&					updateRegistry,
																				   std::vector<deUint32>&							descriptorsPerSet,
																				   vk::VkPipelineLayout								pipelineLayout)
{
	std::vector<DescriptorSetHandleSp> descriptorSets;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		vk::VkDescriptorSetLayout layout = **descriptorSetLayouts[getDescriptorSetNdx(descriptorSetCount, setNdx)];

		const vk::VkDescriptorSetAllocateInfo	allocInfo =
		{
			vk::VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
			DE_NULL,
			pool,
			1u,
			&layout
		};

		vk::VkImageView viewA = images.getImageView(setNdx * getInterfaceNumResources(shaderInterface));
		vk::VkImageView viewB = images.getImageView(setNdx * getInterfaceNumResources(shaderInterface) + 1);

		vk::Move<vk::VkDescriptorSet>			descriptorSet;
		if (updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH && updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			descriptorSet = allocateDescriptorSet(vki, device, &allocInfo);
		}
		else
		{
			descriptorSet = vk::Move<vk::VkDescriptorSet>();
		}

		if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE)
		{
			writeDescriptorSetWithTemplate(vki, device, descriptorType, shaderInterface, layout, pool, viewA, viewB, *descriptorSet, updateTemplates, updateRegistry);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			writeDescriptorSetWithTemplate(vki, device, descriptorType, shaderInterface, layout, pool, viewA, viewB, *descriptorSet, updateTemplates, updateRegistry, true, pipelineLayout);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
		{
			writeDescriptorSet(vki, device, descriptorType, shaderInterface, layout, pool, viewA, viewB, *descriptorSet, updateBuilder, descriptorsPerSet, updateMethod);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
		{
			writeDescriptorSet(vki, device, descriptorType, shaderInterface, layout, pool, viewA, viewB, *descriptorSet, updateBuilder, descriptorsPerSet);
		}

		descriptorSets.push_back(DescriptorSetHandleSp(new DescriptorSetHandleUp(descriptorSet)));
	}
	return descriptorSets;
}

void ImageFetchRenderInstance::writeDescriptorSet (const vk::DeviceInterface&		vki,
												   vk::VkDevice						device,
												   vk::VkDescriptorType				descriptorType,
												   ShaderInputInterface				shaderInterface,
												   vk::VkDescriptorSetLayout		layout,
												   vk::VkDescriptorPool				pool,
												   vk::VkImageView					viewA,
												   vk::VkImageView					viewB,
												   vk::VkDescriptorSet				descriptorSet,
												   vk::DescriptorSetUpdateBuilder&	updateBuilder,
												   std::vector<deUint32>&			descriptorsPerSet,
												   DescriptorUpdateMethod			updateMethod)
{
	DE_UNREF(layout);
	DE_UNREF(pool);
	const vk::VkImageLayout									imageLayout			= getImageLayoutForDescriptorType(descriptorType);
	const vk::VkDescriptorImageInfo							imageInfos[2]		=
	{
		makeDescriptorImageInfo(viewA, imageLayout),
		makeDescriptorImageInfo(viewB, imageLayout),
	};
	deUint32												numDescriptors		= 0u;

	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &imageInfos[0]);
			numDescriptors++;
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &imageInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(1u), descriptorType, &imageInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &imageInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(2u), descriptorType, &imageInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), descriptorType, &imageInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), descriptorType, &imageInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, 2u, imageInfos);
			numDescriptors++;
			break;

		default:
			DE_FATAL("Impossible");
	}

	descriptorsPerSet.push_back(numDescriptors);

	if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		updateBuilder.update(vki, device);
		updateBuilder.clear();
	}
}

void ImageFetchRenderInstance::writeDescriptorSetWithTemplate (const vk::DeviceInterface&					vki,
															   vk::VkDevice									device,
															   vk::VkDescriptorType							descriptorType,
															   ShaderInputInterface							shaderInterface,
															   vk::VkDescriptorSetLayout					layout,
															   vk::VkDescriptorPool							pool,
															   vk::VkImageView								viewA,
															   vk::VkImageView								viewB,
															   vk::VkDescriptorSet							descriptorSet,
															   std::vector<UpdateTemplateHandleSp>&			updateTemplates,
															   std::vector<RawUpdateRegistry>&				registry,
															   bool											withPush,
															   vk::VkPipelineLayout							pipelineLayout)
{
	DE_UNREF(pool);
	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// updateCount
		DE_NULL,	// pUpdates
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_GRAPHICS,
		pipelineLayout,
		0
	};
	const vk::VkImageLayout									imageLayout			= getImageLayoutForDescriptorType(descriptorType);
	const vk::VkDescriptorImageInfo							imageInfos[2]		=
	{
		makeDescriptorImageInfo(viewA, imageLayout),
		makeDescriptorImageInfo(viewB, imageLayout),
	};

	RawUpdateRegistry										updateRegistry;

	updateRegistry.addWriteObject(imageInfos[0]);
	updateRegistry.addWriteObject(imageInfos[1]);

	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(1, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(2, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateEntries.push_back(createTemplateBinding(0, 0, 2, descriptorType, updateRegistry.getWriteObjectOffset(0), sizeof(imageInfos[0])));
			break;

		default:
			DE_FATAL("Impossible");
	}

	templateCreateInfo.pDescriptorUpdateEntries		= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount	= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(vki, device, &templateCreateInfo);
	updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	registry.push_back(updateRegistry);

	if (!withPush)
	{
		vki.updateDescriptorSetWithTemplate(device, descriptorSet, **updateTemplates.back(), registry.back().getRawPointer());
	}
}

void ImageFetchRenderInstance::logTestPlan (void) const
{
	std::ostringstream msg;

	msg << "Rendering 2x2 grid.\n"
		<< ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
		<< "Each descriptor set contains "
			<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
		<< " descriptor(s) of type " << vk::getDescriptorTypeName(m_descriptorType) << "\n"
		<< "Image view type is " << vk::getImageViewTypeName(m_viewType) << "\n";

	if (m_baseMipLevel)
		msg << "Image view base mip level = " << m_baseMipLevel << "\n";
	if (m_baseArraySlice)
		msg << "Image view base array slice = " << m_baseArraySlice << "\n";

	if (m_stageFlags == 0u)
	{
		msg << "Descriptors are not accessed in any shader stage.\n";
	}
	else
	{
		msg << "Color in each cell is fetched using the descriptor(s):\n";

		for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
		{
			msg << "Test sample " << resultNdx << ": fetching at position " << m_images.getFetchPos(m_viewType, m_baseMipLevel, m_baseArraySlice, resultNdx);

			if (m_shaderInterface != SHADER_INPUT_SINGLE_DESCRIPTOR)
			{
				const int srcResourceNdx = (resultNdx % 2); // ABAB source
				msg << " from descriptor " << srcResourceNdx;
			}

			msg << "\n";
		}

		msg << "Descriptors are accessed in {"
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_VERTEX_BIT) != 0)					? (" vertex")			: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0)	? (" tess_control")		: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT) != 0)	? (" tess_evaluation")	: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_GEOMETRY_BIT) != 0)				? (" geometry")			: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_FRAGMENT_BIT) != 0)				? (" fragment")			: (""))
			<< " } stages.";
	}

	m_context.getTestContext().getLog()
		<< tcu::TestLog::Message
		<< msg.str()
		<< tcu::TestLog::EndMessage;
}

vk::VkPipelineLayout ImageFetchRenderInstance::getPipelineLayout (void) const
{
	return *m_pipelineLayout;
}

void ImageFetchRenderInstance::writeDrawCmdBuffer (vk::VkCommandBuffer cmd) const
{
	if (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE && m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		std::vector<vk::VkDescriptorSet> sets;
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			sets.push_back(**m_descriptorSets[setNdx]);

		switch (m_descriptorSetCount)
		{
			case DESCRIPTOR_SET_COUNT_SINGLE:
			case DESCRIPTOR_SET_COUNT_MULTIPLE:
			{
				m_vki.cmdBindDescriptorSets(cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, getPipelineLayout(), 0, (int)sets.size(), &sets.front(), 0, DE_NULL);
				break;
			}
			case DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS:
			{
				for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
				{
					const deUint32 descriptorSetNdx = getDescriptorSetNdx(m_descriptorSetCount, setNdx);
					m_vki.cmdBindDescriptorSets(cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, getPipelineLayout(), descriptorSetNdx, 1, &sets[setNdx], 0, DE_NULL);
				}
				break;
			}
			default:
				DE_FATAL("Impossible");
		}
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			m_vki.cmdPushDescriptorSetWithTemplateKHR(cmd, **m_updateTemplates[setNdx], getPipelineLayout(), getDescriptorSetNdx(m_descriptorSetCount, setNdx), (const void*)m_updateRegistry[setNdx].getRawPointer());
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		deUint32 descriptorNdx = 0u;
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
		{
			const deUint32	numDescriptors = m_descriptorsPerSet[setNdx];
			m_updateBuilder.updateWithPush(m_vki, cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, *m_pipelineLayout, getDescriptorSetNdx(m_descriptorSetCount, setNdx), descriptorNdx, numDescriptors);
			descriptorNdx += numDescriptors;
		}
	}

	m_vki.cmdDraw(cmd, 6 * 4, 1, 0, 0); // render four quads (two separate triangles)
}

tcu::TestStatus ImageFetchRenderInstance::verifyResultImage (const tcu::ConstPixelBufferAccess& result) const
{
	const deUint32		numDescriptorSets	= getDescriptorSetCount(m_descriptorSetCount);
	const tcu::Vec4		green				(0.0f, 1.0f, 0.0f, 1.0f);
	const tcu::Vec4		yellow				(1.0f, 1.0f, 0.0f, 1.0f);
	const bool			doFetch				= (m_stageFlags != 0u); // no active stages? Then don't fetch

	tcu::Surface		reference			(m_targetSize.x(), m_targetSize.y());

	tcu::Vec4			sample0				= tcu::Vec4(0.0f);
	tcu::Vec4			sample1				= tcu::Vec4(0.0f);
	tcu::Vec4			sample2				= tcu::Vec4(0.0f);
	tcu::Vec4			sample3				= tcu::Vec4(0.0f);

	for (deUint32 setNdx = 0; setNdx < numDescriptorSets; setNdx++)
	{
		sample0 += (!doFetch) ? (yellow)	: (m_images.fetchImageValue(0, setNdx));
		sample1 += (!doFetch) ? (green)		: (m_images.fetchImageValue(1, setNdx));
		sample2 += (!doFetch) ? (green)		: (m_images.fetchImageValue(2, setNdx));
		sample3 += (!doFetch) ? (yellow)	: (m_images.fetchImageValue(3, setNdx));
	}

	if (numDescriptorSets > 1)
	{
		sample0 = sample0 / tcu::Vec4(float(numDescriptorSets));
		sample1 = sample1 / tcu::Vec4(float(numDescriptorSets));
		sample2 = sample2 / tcu::Vec4(float(numDescriptorSets));
		sample3 = sample3 / tcu::Vec4(float(numDescriptorSets));
	}

	drawQuadrantReferenceResult(reference.getAccess(), sample0, sample1, sample2, sample3);

	if (!bilinearCompare(m_context.getTestContext().getLog(), "Compare", "Result comparison", reference.getAccess(), result, tcu::RGBA(1, 1, 1, 1), tcu::COMPARE_LOG_RESULT))
		return tcu::TestStatus::fail("Image verification failed");
	else
		return tcu::TestStatus::pass("Pass");
}

class ImageFetchComputeInstance : public vkt::TestInstance
{
public:
													ImageFetchComputeInstance				(vkt::Context&			context,
																							 DescriptorUpdateMethod	updateMethod,
																							 vk::VkDescriptorType	descriptorType,
																							 DescriptorSetCount		descriptorSetCount,
																							 ShaderInputInterface	shaderInterface,
																							 vk::VkImageViewType	viewType,
																							 deUint32				baseMipLevel,
																							 deUint32				baseArraySlice);

private:
	vk::Move<vk::VkDescriptorSetLayout>				createDescriptorSetLayout				(deUint32 setNdx) const;
	vk::Move<vk::VkDescriptorPool>					createDescriptorPool					(void) const;
	vk::Move<vk::VkDescriptorSet>					createDescriptorSet						(vk::VkDescriptorPool pool, vk::VkDescriptorSetLayout layout, deUint32 setNdx);
	void											writeDescriptorSet						(vk::VkDescriptorSet descriptorSet, deUint32 setNdx);
	void											writeDescriptorSetWithTemplate			(vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, bool withPush = false, vk::VkPipelineLayout pipelineLayout = DE_NULL);


	tcu::TestStatus									iterate									(void);
	void											logTestPlan								(void) const;
	tcu::TestStatus									testResourceAccess						(void);

	const DescriptorUpdateMethod					m_updateMethod;
	const vk::VkDescriptorType						m_descriptorType;
	const DescriptorSetCount						m_descriptorSetCount;
	const ShaderInputInterface						m_shaderInterface;
	const vk::VkImageViewType						m_viewType;
	const deUint32									m_baseMipLevel;
	const deUint32									m_baseArraySlice;
	std::vector<UpdateTemplateHandleSp>				m_updateTemplates;
	const vk::DeviceInterface&						m_vki;
	const vk::VkDevice								m_device;
	const vk::VkQueue								m_queue;
	const deUint32									m_queueFamilyIndex;
	vk::Allocator&									m_allocator;
	const ComputeInstanceResultBuffer				m_result;
	const ImageFetchInstanceImages					m_images;
	std::vector<RawUpdateRegistry>					m_updateRegistry;
	vk::DescriptorSetUpdateBuilder					m_updateBuilder;
	std::vector<deUint32>							m_descriptorsPerSet;
};

ImageFetchComputeInstance::ImageFetchComputeInstance (Context&					context,
													  DescriptorUpdateMethod	updateMethod,
													  vk::VkDescriptorType		descriptorType,
													  DescriptorSetCount		descriptorSetCount,
													  ShaderInputInterface		shaderInterface,
													  vk::VkImageViewType		viewType,
													  deUint32					baseMipLevel,
													  deUint32					baseArraySlice)
	: vkt::TestInstance		(context)
	, m_updateMethod		(updateMethod)
	, m_descriptorType		(descriptorType)
	, m_descriptorSetCount	(descriptorSetCount)
	, m_shaderInterface		(shaderInterface)
	, m_viewType			(viewType)
	, m_baseMipLevel		(baseMipLevel)
	, m_baseArraySlice		(baseArraySlice)
	, m_updateTemplates		()
	, m_vki					(context.getDeviceInterface())
	, m_device				(context.getDevice())
	, m_queue				(context.getUniversalQueue())
	, m_queueFamilyIndex	(context.getUniversalQueueFamilyIndex())
	, m_allocator			(context.getDefaultAllocator())
	, m_result				(m_vki, m_device, m_allocator)
	, m_images				(m_vki, m_device, m_queueFamilyIndex, m_queue, m_allocator, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_viewType, m_baseMipLevel, m_baseArraySlice)
	, m_updateRegistry		()
	, m_updateBuilder		()
	, m_descriptorsPerSet	()
{
}

vk::Move<vk::VkDescriptorSetLayout> ImageFetchComputeInstance::createDescriptorSetLayout (deUint32 setNdx) const
{
	vk::DescriptorSetLayoutBuilder			builder;
	vk::VkDescriptorSetLayoutCreateFlags	extraFlags	= 0;
	deUint32								binding		= 0;

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE ||
			m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		extraFlags |= vk::VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR;
	}

	if (setNdx == 0)
		builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++);

	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding);
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding + 2);
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, getArbitraryBindingIndex(0));
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, getArbitraryBindingIndex(1));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			builder.addArrayBinding(m_descriptorType, 2u, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		default:
			DE_FATAL("Impossible");
	};

	return builder.build(m_vki, m_device, extraFlags);
}

vk::Move<vk::VkDescriptorPool> ImageFetchComputeInstance::createDescriptorPool (void) const
{
	return vk::DescriptorPoolBuilder()
		.addType(vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER)
		.addType(m_descriptorType, getDescriptorSetCount(m_descriptorSetCount) * getInterfaceNumResources(m_shaderInterface))
		.build(m_vki, m_device, vk::VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, getDescriptorSetCount(m_descriptorSetCount));
}

vk::Move<vk::VkDescriptorSet> ImageFetchComputeInstance::createDescriptorSet (vk::VkDescriptorPool pool, vk::VkDescriptorSetLayout layout, deUint32 setNdx)
{
	const vk::VkDescriptorSetAllocateInfo	allocInfo		=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
		DE_NULL,
		pool,
		1u,
		&layout
	};

	vk::Move<vk::VkDescriptorSet>			descriptorSet;
	if (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH && m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		descriptorSet = allocateDescriptorSet(m_vki, m_device, &allocInfo);
	}
	else
	{
		descriptorSet = vk::Move<vk::VkDescriptorSet>();
	}

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE)
	{
		writeDescriptorSetWithTemplate(*descriptorSet, layout, setNdx);
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		writeDescriptorSet(*descriptorSet, setNdx);
	}

	return descriptorSet;
}

void ImageFetchComputeInstance::writeDescriptorSet (vk::VkDescriptorSet descriptorSet, deUint32 setNdx)
{
	const vk::VkDescriptorBufferInfo	resultInfo		= vk::makeDescriptorBufferInfo(m_result.getBuffer(), 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkImageLayout				imageLayout		= getImageLayoutForDescriptorType(m_descriptorType);
	const vk::VkDescriptorImageInfo		imageInfos[2]	=
	{
		makeDescriptorImageInfo(m_images.getImageView(setNdx * getInterfaceNumResources(m_shaderInterface)), imageLayout),
		makeDescriptorImageInfo(m_images.getImageView(setNdx * getInterfaceNumResources(m_shaderInterface) + 1), imageLayout),
	};

	deUint32							binding			= 0u;
	deUint32							numDescriptors	= 0u;

	// result
	if (setNdx == 0)
	{
		m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, &resultInfo);
		numDescriptors++;
	}

	// images
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &imageInfos[0]);
			numDescriptors++;
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &imageInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &imageInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding), m_descriptorType, &imageInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding + 2), m_descriptorType, &imageInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), m_descriptorType, &imageInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), m_descriptorType, &imageInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			m_updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, 2u, imageInfos);
			numDescriptors++;
			break;

		default:
			DE_FATAL("Impossible");
	}

	m_descriptorsPerSet.push_back(numDescriptors);

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		m_updateBuilder.update(m_vki, m_device);
		m_updateBuilder.clear();
	}
}

void ImageFetchComputeInstance::writeDescriptorSetWithTemplate (vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, bool withPush, vk::VkPipelineLayout pipelineLayout)
{
	const vk::VkDescriptorBufferInfo						resultInfo			= vk::makeDescriptorBufferInfo(m_result.getBuffer(), 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkImageLayout									imageLayout			= getImageLayoutForDescriptorType(m_descriptorType);
	const vk::VkDescriptorImageInfo							imageInfos[2]		=
	{
		makeDescriptorImageInfo(m_images.getImageView(setNdx * getInterfaceNumResources(m_shaderInterface)), imageLayout),
		makeDescriptorImageInfo(m_images.getImageView(setNdx * getInterfaceNumResources(m_shaderInterface) + 1), imageLayout),
	};
	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// updateCount
		DE_NULL,	// pUpdates
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_COMPUTE,
		pipelineLayout,
		setNdx
	};

	deUint32												binding				= 0u;
	deUint32												offset				= 0u;
	RawUpdateRegistry										updateRegistry;

	if (setNdx == 0)
		updateRegistry.addWriteObject(resultInfo);

	updateRegistry.addWriteObject(imageInfos[0]);
	updateRegistry.addWriteObject(imageInfos[1]);

	// result
	if (setNdx == 0)
		updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, updateRegistry.getWriteObjectOffset(offset++), 0));

	// images
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(binding, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(binding + 2, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 2, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), sizeof(imageInfos[0])));
			break;

		default:
			DE_FATAL("Impossible");
	}

	templateCreateInfo.pDescriptorUpdateEntries		= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount	= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(m_vki, m_device, &templateCreateInfo);
	m_updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	m_updateRegistry.push_back(updateRegistry);

	if (!withPush)
	{
		m_vki.updateDescriptorSetWithTemplate(m_device, descriptorSet, **m_updateTemplates.back(), m_updateRegistry.back().getRawPointer());
	}
}

tcu::TestStatus ImageFetchComputeInstance::iterate (void)
{
	logTestPlan();
	return testResourceAccess();
}

void ImageFetchComputeInstance::logTestPlan (void) const
{
	std::ostringstream msg;

	msg << "Fetching 4 values from image in compute shader.\n"
		<< ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
		<< "Each descriptor set contains "
			<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
		<< " descriptor(s) of type " << vk::getDescriptorTypeName(m_descriptorType) << "\n"
		<< "Image view type is " << vk::getImageViewTypeName(m_viewType) << "\n";

	if (m_baseMipLevel)
		msg << "Image view base mip level = " << m_baseMipLevel << "\n";
	if (m_baseArraySlice)
		msg << "Image view base array slice = " << m_baseArraySlice << "\n";

	for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
	{
		msg << "Test sample " << resultNdx << ": fetch at position " << m_images.getFetchPos(m_viewType, m_baseMipLevel, m_baseArraySlice, resultNdx);

		if (m_shaderInterface != SHADER_INPUT_SINGLE_DESCRIPTOR)
		{
			const int srcResourceNdx = (resultNdx % 2); // ABAB source
			msg << " from descriptor " << srcResourceNdx;
		}

		msg << "\n";
	}

	m_context.getTestContext().getLog()
		<< tcu::TestLog::Message
		<< msg.str()
		<< tcu::TestLog::EndMessage;
}

tcu::TestStatus ImageFetchComputeInstance::testResourceAccess (void)
{
	const vk::Unique<vk::VkDescriptorPool>			descriptorPool		(createDescriptorPool());
	std::vector<DescriptorSetLayoutHandleSp>		descriptorSetLayouts;
	std::vector<DescriptorSetHandleSp>				descriptorSets;
	std::vector<vk::VkDescriptorSetLayout>			layoutHandles;
	std::vector<vk::VkDescriptorSet>				setHandles;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
	{
		vk::Move<vk::VkDescriptorSetLayout>	layout	= createDescriptorSetLayout(setNdx);
		vk::Move<vk::VkDescriptorSet>		set		= createDescriptorSet(*descriptorPool, *layout, setNdx);

		descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(layout)));
		descriptorSets.push_back(DescriptorSetHandleSp(new DescriptorSetHandleUp(set)));

		layoutHandles.push_back(**descriptorSetLayouts.back());
		setHandles.push_back(**descriptorSets.back());

		// Add an empty descriptor set layout between sets 0 and 2
		if (setNdx == 0 && m_descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS)
		{
			vk::DescriptorSetLayoutBuilder		emptyBuilder;
			vk::Move<vk::VkDescriptorSetLayout>	emptyLayout = emptyBuilder.build(m_vki, m_device, (vk::VkDescriptorSetLayoutCreateFlags)0);

			descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(emptyLayout)));
			layoutHandles.push_back(**descriptorSetLayouts.back());
		}
	}

	const ComputePipeline							pipeline			(m_vki, m_device, m_context.getBinaryCollection(), (int)layoutHandles.size(), &layoutHandles.front());
	const deUint32* const							dynamicOffsets		= DE_NULL;
	const int										numDynamicOffsets	= 0;
	const vk::VkBufferMemoryBarrier* const			preBarriers			= DE_NULL;
	const int										numPreBarriers		= 0;
	const vk::VkBufferMemoryBarrier* const			postBarriers		= m_result.getResultReadBarrier();
	const int										numPostBarriers		= 1;

	const ComputeCommand							compute				(m_vki,
																		 m_device,
																		 pipeline.getPipeline(),
																		 pipeline.getPipelineLayout(),
																		 tcu::UVec3(4, 1, 1),
																		 m_shaderInterface,
																		 m_descriptorSetCount,	&setHandles.front(),
																		 numDynamicOffsets,		dynamicOffsets,
																		 numPreBarriers,		preBarriers,
																		 numPostBarriers,		postBarriers);

	tcu::Vec4										results[4];
	bool											anyResultSet		= false;
	bool											allResultsOk		= true;

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			writeDescriptorSetWithTemplate(DE_NULL, layoutHandles[setNdx], setNdx, true, pipeline.getPipelineLayout());

		compute.submitAndWait(m_queueFamilyIndex, m_queue, &m_updateTemplates, &m_updateRegistry);
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			writeDescriptorSet(DE_NULL, setNdx);

		compute.submitAndWait(m_queueFamilyIndex, m_queue, m_updateBuilder, m_descriptorsPerSet);
	}
	else
	{
		compute.submitAndWait(m_queueFamilyIndex, m_queue);
	}
	m_result.readResultContentsTo(&results);

	// verify
	for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
	{
		const tcu::Vec4	result				= results[resultNdx];

		tcu::Vec4 reference = tcu::Vec4(0.0f);
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			reference += m_images.fetchImageValue(resultNdx, setNdx);

		if (getDescriptorSetCount(m_descriptorSetCount) > 1)
			reference = reference / tcu::Vec4((float)getDescriptorSetCount(m_descriptorSetCount));

		const tcu::Vec4	conversionThreshold	= tcu::Vec4(1.0f / 255.0f);

		if (result != tcu::Vec4(-1.0f))
			anyResultSet = true;

		if (tcu::boolAny(tcu::greaterThan(tcu::abs(result - reference), conversionThreshold)))
		{
			allResultsOk = false;

			m_context.getTestContext().getLog()
				<< tcu::TestLog::Message
				<< "Test sample " << resultNdx << ": Expected " << reference << ", got " << result
				<< tcu::TestLog::EndMessage;
		}
	}

	// read back and verify
	if (allResultsOk)
		return tcu::TestStatus::pass("Pass");
	else if (anyResultSet)
		return tcu::TestStatus::fail("Invalid result values");
	else
	{
		m_context.getTestContext().getLog()
			<< tcu::TestLog::Message
			<< "Result buffer was not written to."
			<< tcu::TestLog::EndMessage;
		return tcu::TestStatus::fail("Result buffer was not written to");
	}
}

class ImageSampleInstanceImages : private ImageInstanceImages
{
public:
										ImageSampleInstanceImages	(const vk::DeviceInterface&		vki,
																	 vk::VkDevice					device,
																	 deUint32						queueFamilyIndex,
																	 vk::VkQueue					queue,
																	 vk::Allocator&					allocator,
																	 vk::VkDescriptorType			descriptorType,
																	 DescriptorSetCount				descriptorSetCount,
																	 ShaderInputInterface			shaderInterface,
																	 vk::VkImageViewType			viewType,
																	 deUint32						baseMipLevel,
																	 deUint32						baseArraySlice,
																	 bool							immutable);

	static std::vector<tcu::Sampler>	getRefSamplers				(DescriptorSetCount				descriptorSetCount,
																	 ShaderInputInterface			shaderInterface);

	static std::vector<SamplerHandleSp>	getSamplers					(const vk::DeviceInterface&		vki,
																	 vk::VkDevice					device,
																	 std::vector<tcu::Sampler>&		refSamplers,
																	 const tcu::TextureFormat		imageFormat);

	static tcu::Vec4					getSamplePos				(vk::VkImageViewType viewType, deUint32 baseMipLevel, deUint32 baseArraySlice, int samplePosNdx);
	tcu::Vec4							fetchSampleValue			(int samplePosNdx, int setNdx) const;

	inline tcu::TextureLevelPyramid		getSourceImage				(int ndx) const { return m_sourceImage[ndx % m_sourceImage.size()];	}
	inline vk::VkImageView				getImageView				(int ndx) const { return **m_imageView[ndx % m_imageView.size()];	}
	inline tcu::Sampler					getRefSampler				(int ndx) const { return m_refSampler[ndx % m_refSampler.size()];	}
	inline vk::VkSampler				getSampler					(int ndx) const { return **m_sampler[ndx % m_sampler.size()];		}
	inline bool							isImmutable					(void) const	{ return m_isImmutable;								}

private:
	static int							getNumImages				(vk::VkDescriptorType descriptorType, DescriptorSetCount descriptorSetCount, ShaderInputInterface shaderInterface);
	static tcu::Sampler					createRefSampler			(int ndx);
	static vk::Move<vk::VkSampler>		createSampler				(const vk::DeviceInterface& vki, vk::VkDevice device, const tcu::Sampler& sampler, const tcu::TextureFormat& format);

	static tcu::Texture1DArrayView		getRef1DView				(const tcu::TextureLevelPyramid& source, deUint32 baseMipLevel, deUint32 baseArraySlice, std::vector<tcu::ConstPixelBufferAccess>* levelStorage);
	static tcu::Texture2DArrayView		getRef2DView				(const tcu::TextureLevelPyramid& source, deUint32 baseMipLevel, deUint32 baseArraySlice, std::vector<tcu::ConstPixelBufferAccess>* levelStorage);
	static tcu::Texture3DView			getRef3DView				(const tcu::TextureLevelPyramid& source, deUint32 baseMipLevel, deUint32 baseArraySlice, std::vector<tcu::ConstPixelBufferAccess>* levelStorage);
	static tcu::TextureCubeArrayView	getRefCubeView				(const tcu::TextureLevelPyramid& source, deUint32 baseMipLevel, deUint32 baseArraySlice, std::vector<tcu::ConstPixelBufferAccess>* levelStorage);

	const vk::VkDescriptorType			m_descriptorType;
	const ShaderInputInterface			m_shaderInterface;
	const bool							m_isImmutable;

	std::vector<tcu::Sampler>			m_refSampler;
	std::vector<SamplerHandleSp>		m_sampler;
};

ImageSampleInstanceImages::ImageSampleInstanceImages (const vk::DeviceInterface&	vki,
													  vk::VkDevice					device,
													  deUint32						queueFamilyIndex,
													  vk::VkQueue					queue,
													  vk::Allocator&				allocator,
													  vk::VkDescriptorType			descriptorType,
													  DescriptorSetCount			descriptorSetCount,
													  ShaderInputInterface			shaderInterface,
													  vk::VkImageViewType			viewType,
													  deUint32						baseMipLevel,
													  deUint32						baseArraySlice,
													  bool							immutable)
	: ImageInstanceImages	(vki,
							 device,
							 queueFamilyIndex,
							 queue,
							 allocator,
							 descriptorType,
							 viewType,
							 getNumImages(descriptorType, descriptorSetCount, shaderInterface),
							 baseMipLevel,
							 baseArraySlice)
	, m_descriptorType		(descriptorType)
	, m_shaderInterface		(shaderInterface)
	, m_isImmutable			(immutable)
	, m_refSampler			(getRefSamplers(descriptorSetCount, shaderInterface))
	, m_sampler				(getSamplers(vki, device, m_refSampler, m_imageFormat))
{
}

std::vector<tcu::Sampler> ImageSampleInstanceImages::getRefSamplers (DescriptorSetCount		descriptorSetCount,
																	 ShaderInputInterface	shaderInterface)
{
	std::vector<tcu::Sampler> refSamplers;
	for (deUint32 samplerNdx = 0; samplerNdx < getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface); samplerNdx++)
		refSamplers.push_back(createRefSampler(samplerNdx));

	return refSamplers;
}

std::vector<SamplerHandleSp> ImageSampleInstanceImages::getSamplers (const vk::DeviceInterface&	vki,
																     vk::VkDevice				device,
																     std::vector<tcu::Sampler>&	refSamplers,
																     const tcu::TextureFormat	imageFormat)
{
	std::vector<SamplerHandleSp> samplers;
	for (deUint32 samplerNdx = 0; samplerNdx < (deUint32)refSamplers.size(); samplerNdx++)
	{
		vk::Move<vk::VkSampler> sampler = createSampler(vki, device, refSamplers[samplerNdx], imageFormat);
		samplers.push_back(SamplerHandleSp(new SamplerHandleUp(sampler)));
	}
	return samplers;
}

tcu::Vec4 ImageSampleInstanceImages::getSamplePos (vk::VkImageViewType viewType, deUint32 baseMipLevel, deUint32 baseArraySlice, int samplePosNdx)
{
	DE_ASSERT(de::inBounds(samplePosNdx, 0, 4));

	const deUint32	imageSize	= (deUint32)IMAGE_SIZE >> baseMipLevel;
	const deUint32	arraySize	= isImageViewTypeArray(viewType) ? ARRAY_SIZE - baseArraySlice : 1;

	// choose arbitrary values that are not ambiguous with NEAREST filtering

	switch (viewType)
	{
		case vk::VK_IMAGE_VIEW_TYPE_1D:
		case vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY:
		case vk::VK_IMAGE_VIEW_TYPE_2D:
		case vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY:
		case vk::VK_IMAGE_VIEW_TYPE_3D:
		{
			const tcu::Vec3	coords[4]	=
			{
				tcu::Vec3(0.75f,
						  0.5f,
						  (float)(12u % imageSize) + 0.25f),

				tcu::Vec3((float)(23u % imageSize) + 0.25f,
						  (float)(73u % imageSize) + 0.5f,
						  (float)(16u % imageSize) + 0.5f + (float)imageSize),

				tcu::Vec3(-(float)(43u % imageSize) + 0.25f,
						  (float)(84u % imageSize) + 0.5f + (float)imageSize,
						  (float)(117u % imageSize) + 0.75f),

				tcu::Vec3((float)imageSize + 0.5f,
						  (float)(75u % imageSize) + 0.25f,
						  (float)(83u % imageSize) + 0.25f + (float)imageSize),
			};
			const deUint32	slices[4]	=
			{
				0u % arraySize,
				4u % arraySize,
				9u % arraySize,
				2u % arraySize,
			};

			if (viewType == vk::VK_IMAGE_VIEW_TYPE_1D || viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)
				return tcu::Vec4(coords[samplePosNdx].x() / (float)imageSize,
								 (float)slices[samplePosNdx],
								 0.0f,
								 0.0f);
			else if (viewType == vk::VK_IMAGE_VIEW_TYPE_2D || viewType == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY)
				return tcu::Vec4(coords[samplePosNdx].x() / (float)imageSize,
								 coords[samplePosNdx].y() / (float)imageSize,
								 (float)slices[samplePosNdx],
								 0.0f);
			else if (viewType == vk::VK_IMAGE_VIEW_TYPE_3D)
				return tcu::Vec4(coords[samplePosNdx].x() / (float)imageSize,
								 coords[samplePosNdx].y() / (float)imageSize,
								 coords[samplePosNdx].z() / (float)imageSize,
								 0.0f);
			else
			{
				DE_FATAL("Impossible");
				return tcu::Vec4();
			}
		}

		case vk::VK_IMAGE_VIEW_TYPE_CUBE:
		case vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY:
		{
			// \note these values are in [0, texSize]*3 space for convenience
			const tcu::Vec3	coords[4]	=
			{
				tcu::Vec3(0.75f,
						  0.5f,
						  (float)imageSize),

				tcu::Vec3((float)(13u % imageSize) + 0.25f,
						  0.0f,
						  (float)(16u % imageSize) + 0.5f),

				tcu::Vec3(0.0f,
						  (float)(84u % imageSize) + 0.5f,
						  (float)(10u % imageSize) + 0.75f),

				tcu::Vec3((float)imageSize,
						  (float)(75u % imageSize) + 0.25f,
						  (float)(83u % imageSize) + 0.75f),
			};
			const deUint32	slices[4]	=
			{
				1u % arraySize,
				2u % arraySize,
				9u % arraySize,
				5u % arraySize,
			};

			DE_ASSERT(de::inRange(coords[samplePosNdx].x(), 0.0f, (float)imageSize));
			DE_ASSERT(de::inRange(coords[samplePosNdx].y(), 0.0f, (float)imageSize));
			DE_ASSERT(de::inRange(coords[samplePosNdx].z(), 0.0f, (float)imageSize));

			// map to [-1, 1]*3 space
			return tcu::Vec4(coords[samplePosNdx].x() / (float)imageSize * 2.0f - 1.0f,
							 coords[samplePosNdx].y() / (float)imageSize * 2.0f - 1.0f,
							 coords[samplePosNdx].z() / (float)imageSize * 2.0f - 1.0f,
							 (float)slices[samplePosNdx]);
		}

		default:
			DE_FATAL("Impossible");
			return tcu::Vec4();
	}
}

tcu::Vec4 ImageSampleInstanceImages::fetchSampleValue (int samplePosNdx, int setNdx) const
{
	DE_ASSERT(de::inBounds(samplePosNdx, 0, 4));

	// texture order is ABAB
	const bool									isSamplerCase	= (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER);
	const deUint32								numImages		= (isSamplerCase) ? 1 : getInterfaceNumResources(m_shaderInterface);
	const tcu::TextureLevelPyramid&				sampleSrcA		= getSourceImage(setNdx * numImages);
	const tcu::TextureLevelPyramid&				sampleSrcB		= (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? sampleSrcA : getSourceImage(setNdx * numImages + 1);
	const tcu::TextureLevelPyramid&				sampleSrc		= (isSamplerCase) ? (sampleSrcA) : ((samplePosNdx % 2) == 0) ? (sampleSrcA) : (sampleSrcB);

	// sampler order is ABAB
	const tcu::Sampler&							samplerA		= getRefSampler(setNdx * getInterfaceNumResources(m_shaderInterface));
	const tcu::Sampler&							samplerB		= (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? (samplerA) : getRefSampler(setNdx * getInterfaceNumResources(m_shaderInterface) + 1);
	const tcu::Sampler&							sampler			= ((samplePosNdx % 2) == 0) ? (samplerA) : (samplerB);

	const tcu::Vec4								samplePos		= getSamplePos(m_viewType, m_baseMipLevel, m_baseArraySlice, samplePosNdx);
	const float									lod				= 0.0f;
	std::vector<tcu::ConstPixelBufferAccess>	levelStorage;

	switch (m_viewType)
	{
		case vk::VK_IMAGE_VIEW_TYPE_1D:
		case vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY:	return getRef1DView(sampleSrc, m_baseMipLevel, m_baseArraySlice, &levelStorage).sample(sampler, samplePos.x(), samplePos.y(), lod);
		case vk::VK_IMAGE_VIEW_TYPE_2D:
		case vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY:	return getRef2DView(sampleSrc, m_baseMipLevel, m_baseArraySlice, &levelStorage).sample(sampler, samplePos.x(), samplePos.y(), samplePos.z(), lod);
		case vk::VK_IMAGE_VIEW_TYPE_3D:			return getRef3DView(sampleSrc, m_baseMipLevel, m_baseArraySlice, &levelStorage).sample(sampler, samplePos.x(), samplePos.y(), samplePos.z(), lod);
		case vk::VK_IMAGE_VIEW_TYPE_CUBE:
		case vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY:	return getRefCubeView(sampleSrc, m_baseMipLevel, m_baseArraySlice, &levelStorage).sample(sampler, samplePos.x(), samplePos.y(), samplePos.z(), samplePos.w(), lod);

		default:
		{
			DE_FATAL("Impossible");
			return tcu::Vec4();
		}
	}
}

int ImageSampleInstanceImages::getNumImages (vk::VkDescriptorType descriptorType, DescriptorSetCount descriptorSetCount, ShaderInputInterface shaderInterface)
{
	// If we are testing separate samplers, just one image is enough
	if (descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
		return getDescriptorSetCount(descriptorSetCount);
	else if (descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
	{
		// combined: numImages == numSamplers
		return getInterfaceNumResources(shaderInterface) * getDescriptorSetCount(descriptorSetCount);
	}
	else
	{
		DE_FATAL("Impossible");
		return 0;
	}
}

tcu::Sampler ImageSampleInstanceImages::createRefSampler (int ndx)
{
	if (ndx % 2 == 0)
	{
		// linear, wrapping
		return tcu::Sampler(tcu::Sampler::REPEAT_GL, tcu::Sampler::REPEAT_GL, tcu::Sampler::REPEAT_GL, tcu::Sampler::LINEAR, tcu::Sampler::LINEAR);
	}
	else
	{
		// nearest, clamping
		return tcu::Sampler(tcu::Sampler::CLAMP_TO_EDGE, tcu::Sampler::CLAMP_TO_EDGE, tcu::Sampler::CLAMP_TO_EDGE, tcu::Sampler::NEAREST, tcu::Sampler::NEAREST);
	}
}

vk::Move<vk::VkSampler> ImageSampleInstanceImages::createSampler (const vk::DeviceInterface& vki, vk::VkDevice device, const tcu::Sampler& sampler, const tcu::TextureFormat& format)
{
	const vk::VkSamplerCreateInfo	createInfo		= vk::mapSampler(sampler, format);

	return vk::createSampler(vki, device, &createInfo);
}

tcu::Texture1DArrayView ImageSampleInstanceImages::getRef1DView (const tcu::TextureLevelPyramid& source, deUint32 baseMipLevel, deUint32 baseArraySlice, std::vector<tcu::ConstPixelBufferAccess>* levelStorage)
{
	DE_ASSERT(levelStorage->empty());

	const deUint32 numSlices = (deUint32)source.getLevel(0).getHeight();
	const deUint32 numLevels = (deUint32)source.getNumLevels();

	// cut pyramid from baseMipLevel
	for (deUint32 level = baseMipLevel; level < numLevels; ++level)
	{
		// cut levels from baseArraySlice
		const tcu::ConstPixelBufferAccess wholeLevel	= source.getLevel(level);
		const tcu::ConstPixelBufferAccess cutLevel		= tcu::getSubregion(wholeLevel, 0, baseArraySlice, wholeLevel.getWidth(), numSlices - baseArraySlice);
		levelStorage->push_back(cutLevel);
	}

	return tcu::Texture1DArrayView((int)levelStorage->size(), &levelStorage->front());
}

tcu::Texture2DArrayView ImageSampleInstanceImages::getRef2DView (const tcu::TextureLevelPyramid& source, deUint32 baseMipLevel, deUint32 baseArraySlice, std::vector<tcu::ConstPixelBufferAccess>* levelStorage)
{
	DE_ASSERT(levelStorage->empty());

	const deUint32 numSlices = (deUint32)source.getLevel(0).getDepth();
	const deUint32 numLevels = (deUint32)source.getNumLevels();

	// cut pyramid from baseMipLevel
	for (deUint32 level = baseMipLevel; level < numLevels; ++level)
	{
		// cut levels from baseArraySlice
		const tcu::ConstPixelBufferAccess wholeLevel	= source.getLevel(level);
		const tcu::ConstPixelBufferAccess cutLevel		= tcu::getSubregion(wholeLevel, 0, 0, baseArraySlice, wholeLevel.getWidth(), wholeLevel.getHeight(), numSlices - baseArraySlice);
		levelStorage->push_back(cutLevel);
	}

	return tcu::Texture2DArrayView((int)levelStorage->size(), &levelStorage->front());
}

tcu::Texture3DView ImageSampleInstanceImages::getRef3DView (const tcu::TextureLevelPyramid& source, deUint32 baseMipLevel, deUint32 baseArraySlice, std::vector<tcu::ConstPixelBufferAccess>* levelStorage)
{
	DE_ASSERT(levelStorage->empty());
	DE_ASSERT(baseArraySlice == 0);
	DE_UNREF(baseArraySlice);

	const deUint32 numLevels = (deUint32)source.getNumLevels();

	// cut pyramid from baseMipLevel
	for (deUint32 level = baseMipLevel; level < numLevels; ++level)
		levelStorage->push_back(source.getLevel(level));

	return tcu::Texture3DView((int)levelStorage->size(), &levelStorage->front());
}

tcu::TextureCubeArrayView ImageSampleInstanceImages::getRefCubeView (const tcu::TextureLevelPyramid& source, deUint32 baseMipLevel, deUint32 baseArraySlice, std::vector<tcu::ConstPixelBufferAccess>* levelStorage)
{
	DE_ASSERT(levelStorage->empty());

	const deUint32 numSlices = (deUint32)source.getLevel(0).getDepth() / 6;
	const deUint32 numLevels = (deUint32)source.getNumLevels();

	// cut pyramid from baseMipLevel
	for (deUint32 level = baseMipLevel; level < numLevels; ++level)
	{
		// cut levels from baseArraySlice
		const tcu::ConstPixelBufferAccess wholeLevel	= source.getLevel(level);
		const tcu::ConstPixelBufferAccess cutLevel		= tcu::getSubregion(wholeLevel, 0, 0, baseArraySlice * 6, wholeLevel.getWidth(), wholeLevel.getHeight(), (numSlices - baseArraySlice) * 6);
		levelStorage->push_back(cutLevel);
	}

	return tcu::TextureCubeArrayView((int)levelStorage->size(), &levelStorage->front());
}

class ImageSampleRenderInstance : public SingleCmdRenderInstance
{
public:
													ImageSampleRenderInstance					(vkt::Context&			context,
																								 DescriptorUpdateMethod updateMethod,
																								 bool					isPrimaryCmdBuf,
																								 vk::VkDescriptorType	descriptorType,
																								 DescriptorSetCount		descriptorSetCount,
																								 vk::VkShaderStageFlags	stageFlags,
																								 ShaderInputInterface	shaderInterface,
																								 vk::VkImageViewType	viewType,
																								 deUint32				baseMipLevel,
																								 deUint32				baseArraySlice,
																								 bool					isImmutable);

private:
	static std::vector<DescriptorSetLayoutHandleSp>	createDescriptorSetLayouts					(const vk::DeviceInterface&							vki,
																								 vk::VkDevice										device,
																								 vk::VkDescriptorType								descriptorType,
																								 DescriptorSetCount									descriptorSetCount,
																								 ShaderInputInterface								shaderInterface,
																								 vk::VkShaderStageFlags								stageFlags,
																								 const ImageSampleInstanceImages&					images,
																								 DescriptorUpdateMethod								updateMethod);

	static vk::Move<vk::VkPipelineLayout>			createPipelineLayout						(const vk::DeviceInterface&							vki,
																								 vk::VkDevice										device,
																								 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayout);

	static vk::Move<vk::VkDescriptorPool>			createDescriptorPool						(const vk::DeviceInterface&							vki,
																								 vk::VkDevice										device,
																								 vk::VkDescriptorType								descriptorType,
																								 DescriptorSetCount									descriptorSetCount,
																								 ShaderInputInterface								shaderInterface);

	static std::vector<DescriptorSetHandleSp>		createDescriptorSets						(const vk::DeviceInterface&							vki,
																								 DescriptorUpdateMethod								updateMethod,
																								 vk::VkDevice										device,
																								 vk::VkDescriptorType								descriptorType,
																								 DescriptorSetCount									descriptorSetCount,
																								 ShaderInputInterface								shaderInterface,
																								 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayouts,
																								 vk::VkDescriptorPool								pool,
																								 bool												isImmutable,
																								 const ImageSampleInstanceImages&					images,
																								 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																								 std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																								 std::vector<RawUpdateRegistry>&					updateRegistry,
																								 std::vector<deUint32>&								descriptorsPerSet,
																								 vk::VkPipelineLayout								pipelineLayout = DE_NULL);

	static void										writeSamplerDescriptorSet					(const vk::DeviceInterface&							vki,
																								 vk::VkDevice										device,
																								 ShaderInputInterface								shaderInterface,
																								 bool												isImmutable,
																								 const ImageSampleInstanceImages&					images,
																								 vk::VkDescriptorSet								descriptorSet,
																								 deUint32											setNdx,
																								 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																								 std::vector<deUint32>&								descriptorsPerSet,
																								 DescriptorUpdateMethod								updateMethod = DESCRIPTOR_UPDATE_METHOD_NORMAL);

	static void										writeImageSamplerDescriptorSet				(const vk::DeviceInterface&							vki,
																								 vk::VkDevice										device,
																								 ShaderInputInterface								shaderInterface,
																								 bool												isImmutable,
																								 const ImageSampleInstanceImages&					images,
																								 vk::VkDescriptorSet								descriptorSet,
																								 deUint32											setNdx,
																								 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																								 std::vector<deUint32>&								descriptorsPerSet,
																								 DescriptorUpdateMethod								updateMethod = DESCRIPTOR_UPDATE_METHOD_NORMAL);

	static void										writeSamplerDescriptorSetWithTemplate		(const vk::DeviceInterface&							vki,
																								 vk::VkDevice										device,
																								 DescriptorSetCount									descriptorSetCount,
																								 ShaderInputInterface								shaderInterface,
																								 bool												isImmutable,
																								 const ImageSampleInstanceImages&					images,
																								 vk::VkDescriptorSet								descriptorSet,
																								 deUint32											setNdx,
																								 vk::VkDescriptorSetLayout							layout,
																								 std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																								 std::vector<RawUpdateRegistry>&					registry,
																								 bool												withPush = false,
																								 vk::VkPipelineLayout								pipelineLayout = 0);

	static void										writeImageSamplerDescriptorSetWithTemplate	(const vk::DeviceInterface&							vki,
																								 vk::VkDevice										device,
																								 DescriptorSetCount									descriptorSetCount,
																								 ShaderInputInterface								shaderInterface,
																								 bool												isImmutable,
																								 const ImageSampleInstanceImages&					images,
																								 vk::VkDescriptorSet								descriptorSet,
																								 deUint32											setNdx,
																								 vk::VkDescriptorSetLayout							layout,
																								 std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																								 std::vector<RawUpdateRegistry>&					registry,
																								 bool												withPush = false,
																								 vk::VkPipelineLayout								pipelineLayout = 0);

	void											logTestPlan									(void) const;
	vk::VkPipelineLayout							getPipelineLayout							(void) const;
	void											writeDrawCmdBuffer							(vk::VkCommandBuffer cmd) const;
	tcu::TestStatus									verifyResultImage							(const tcu::ConstPixelBufferAccess& result) const;

	enum
	{
		RENDER_SIZE = 128,
	};

	const DescriptorUpdateMethod					m_updateMethod;
	const vk::VkDescriptorType						m_descriptorType;
	const DescriptorSetCount						m_descriptorSetCount;
	const vk::VkShaderStageFlags					m_stageFlags;
	const ShaderInputInterface						m_shaderInterface;
	const vk::VkImageViewType						m_viewType;
	const deUint32									m_baseMipLevel;
	const deUint32									m_baseArraySlice;

	std::vector<UpdateTemplateHandleSp>				m_updateTemplates;
	std::vector<RawUpdateRegistry>					m_updateRegistry;
	vk::DescriptorSetUpdateBuilder					m_updateBuilder;
	const ImageSampleInstanceImages					m_images;
	std::vector<deUint32>							m_descriptorsPerSet;
	const std::vector<DescriptorSetLayoutHandleSp>	m_descriptorSetLayouts;
	const vk::Move<vk::VkPipelineLayout>			m_pipelineLayout;
	const vk::Unique<vk::VkDescriptorPool>			m_descriptorPool;
	const std::vector<DescriptorSetHandleSp>		m_descriptorSets;
};

ImageSampleRenderInstance::ImageSampleRenderInstance (vkt::Context&				context,
													  DescriptorUpdateMethod	updateMethod,
													  bool						isPrimaryCmdBuf,
													  vk::VkDescriptorType		descriptorType,
													  DescriptorSetCount		descriptorSetCount,
													  vk::VkShaderStageFlags	stageFlags,
													  ShaderInputInterface		shaderInterface,
													  vk::VkImageViewType		viewType,
													  deUint32					baseMipLevel,
													  deUint32					baseArraySlice,
													  bool						isImmutable)
	: SingleCmdRenderInstance	(context, isPrimaryCmdBuf, tcu::UVec2(RENDER_SIZE, RENDER_SIZE))
	, m_updateMethod			(updateMethod)
	, m_descriptorType			(descriptorType)
	, m_descriptorSetCount		(descriptorSetCount)
	, m_stageFlags				(stageFlags)
	, m_shaderInterface			(shaderInterface)
	, m_viewType				(viewType)
	, m_baseMipLevel			(baseMipLevel)
	, m_baseArraySlice			(baseArraySlice)
	, m_updateTemplates			()
	, m_updateRegistry			()
	, m_updateBuilder			()
	, m_images					(m_vki, m_device, m_queueFamilyIndex, m_queue, m_allocator, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_viewType, m_baseMipLevel, m_baseArraySlice, isImmutable)
	, m_descriptorSetLayouts	(createDescriptorSetLayouts(m_vki, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_stageFlags, m_images, m_updateMethod))
	, m_pipelineLayout			(createPipelineLayout(m_vki, m_device, m_descriptorSetLayouts))
	, m_descriptorPool			(createDescriptorPool(m_vki, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface))
	, m_descriptorSets			(createDescriptorSets(m_vki, m_updateMethod, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_descriptorSetLayouts, *m_descriptorPool, isImmutable, m_images, m_updateBuilder, m_updateTemplates, m_updateRegistry, m_descriptorsPerSet, *m_pipelineLayout))
{
}

std::vector<DescriptorSetLayoutHandleSp> ImageSampleRenderInstance::createDescriptorSetLayouts (const vk::DeviceInterface&			vki,
																								vk::VkDevice						device,
																								vk::VkDescriptorType				descriptorType,
																								DescriptorSetCount					descriptorSetCount,
																								ShaderInputInterface				shaderInterface,
																								vk::VkShaderStageFlags				stageFlags,
																								const ImageSampleInstanceImages&	images,
																								DescriptorUpdateMethod				updateMethod)
{
	std::vector<DescriptorSetLayoutHandleSp> descriptorSetLayouts;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		const vk::VkSampler						samplers[2] =
		{
			images.getSampler(setNdx * getInterfaceNumResources(shaderInterface)),
			images.getSampler(setNdx * getInterfaceNumResources(shaderInterface) + 1),
		};

		vk::DescriptorSetLayoutBuilder			builder;
		const bool								addSeparateImage	= descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER;
		vk::VkDescriptorSetLayoutCreateFlags	extraFlags			= 0;

		if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE ||
			updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
		{
			extraFlags |= vk::VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR;
		}

		// (combined)samplers follow
		switch (shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				if (addSeparateImage)
					builder.addSingleBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, stageFlags);
				builder.addSingleSamplerBinding(descriptorType, stageFlags, (images.isImmutable()) ? (&samplers[0]) : (DE_NULL));
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				if (addSeparateImage)
					builder.addSingleBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, stageFlags);
				builder.addSingleSamplerBinding(descriptorType, stageFlags, (images.isImmutable()) ? (&samplers[0]) : (DE_NULL));
				builder.addSingleSamplerBinding(descriptorType, stageFlags, (images.isImmutable()) ? (&samplers[1]) : (DE_NULL));
				break;

			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				builder.addSingleIndexedSamplerBinding(descriptorType, stageFlags, 0u, (images.isImmutable()) ? (&samplers[0]) : (DE_NULL));
				if (addSeparateImage)
					builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, stageFlags, 1u);
				builder.addSingleIndexedSamplerBinding(descriptorType, stageFlags, 2u, (images.isImmutable()) ? (&samplers[1]) : (DE_NULL));
				break;

			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				if (addSeparateImage)
					builder.addSingleBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, stageFlags);
				builder.addSingleIndexedSamplerBinding(descriptorType, stageFlags, getArbitraryBindingIndex(0), (images.isImmutable()) ? (&samplers[0]) : (DE_NULL));
				builder.addSingleIndexedSamplerBinding(descriptorType, stageFlags, getArbitraryBindingIndex(1), (images.isImmutable()) ? (&samplers[1]) : (DE_NULL));
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				if (addSeparateImage)
					builder.addSingleBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, stageFlags);
				builder.addArraySamplerBinding(descriptorType, 2u, stageFlags, (images.isImmutable()) ? (samplers) : (DE_NULL));
				break;

			default:
				DE_FATAL("Impossible");
		}

		vk::Move<vk::VkDescriptorSetLayout> layout = builder.build(vki, device, extraFlags);
		descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(layout)));

		// Add an empty descriptor set layout between sets 0 and 2
		if (setNdx == 0 && descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS)
		{
			vk::DescriptorSetLayoutBuilder		emptyBuilder;
			vk::Move<vk::VkDescriptorSetLayout>	emptyLayout = emptyBuilder.build(vki, device, (vk::VkDescriptorSetLayoutCreateFlags)0);
			descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(emptyLayout)));
		}
	}

	return descriptorSetLayouts;
}

vk::Move<vk::VkPipelineLayout> ImageSampleRenderInstance::createPipelineLayout (const vk::DeviceInterface&						vki,
																				vk::VkDevice									device,
																				const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayout)
{
	std::vector<vk::VkDescriptorSetLayout> layoutHandles;
	for (size_t setNdx = 0; setNdx < descriptorSetLayout.size(); setNdx++)
		layoutHandles.push_back(**descriptorSetLayout[setNdx]);

	const vk::VkPipelineLayoutCreateInfo createInfo =
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineLayoutCreateFlags)0,
		(deUint32)layoutHandles.size(),				// descriptorSetCount
		&layoutHandles.front(),						// pSetLayouts
		0u,											// pushConstantRangeCount
		DE_NULL,									// pPushConstantRanges
	};
	return vk::createPipelineLayout(vki, device, &createInfo);
}

vk::Move<vk::VkDescriptorPool> ImageSampleRenderInstance::createDescriptorPool (const vk::DeviceInterface&	vki,
																				vk::VkDevice				device,
																				vk::VkDescriptorType		descriptorType,
																				DescriptorSetCount			descriptorSetCount,
																				ShaderInputInterface		shaderInterface)
{
	vk::DescriptorPoolBuilder builder;

	if (descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
	{
		// separate samplers need image to sample
		builder.addType(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, getDescriptorSetCount(descriptorSetCount));

		// also need sample to use, indifferent of whether immutable or not
		builder.addType(vk::VK_DESCRIPTOR_TYPE_SAMPLER, getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface));
	}
	else if (descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
	{
		// combined image samplers
		builder.addType(vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface));
	}
	else
		DE_FATAL("Impossible");

	return builder.build(vki, device, vk::VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, getDescriptorSetCount(descriptorSetCount));
}

std::vector<DescriptorSetHandleSp> ImageSampleRenderInstance::createDescriptorSets (const vk::DeviceInterface&						vki,
																					DescriptorUpdateMethod							updateMethod,
																					vk::VkDevice									device,
																					vk::VkDescriptorType							descriptorType,
																					DescriptorSetCount								descriptorSetCount,
																					ShaderInputInterface							shaderInterface,
																					const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayouts,
																					vk::VkDescriptorPool							pool,
																					bool											isImmutable,
																					const ImageSampleInstanceImages&				images,
																					vk::DescriptorSetUpdateBuilder&					updateBuilder,
																					std::vector<UpdateTemplateHandleSp>&			updateTemplates,
																					std::vector<RawUpdateRegistry>&					updateRegistry,
																					std::vector<deUint32>&							descriptorsPerSet,
																					vk::VkPipelineLayout							pipelineLayout)
{
	std::vector<DescriptorSetHandleSp> descriptorSets;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		vk::VkDescriptorSetLayout layout = **descriptorSetLayouts[getDescriptorSetNdx(descriptorSetCount, setNdx)];

		const vk::VkDescriptorSetAllocateInfo	allocInfo =
		{
			vk::VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
			DE_NULL,
			pool,
			1u,
			&layout
		};

		vk::Move<vk::VkDescriptorSet>			descriptorSet;
		if (updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH && updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			descriptorSet = allocateDescriptorSet(vki, device, &allocInfo);
		}
		else
		{
			descriptorSet = vk::Move<vk::VkDescriptorSet>();
		}

		if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE)
		{
			if (descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				writeSamplerDescriptorSetWithTemplate(vki, device, descriptorSetCount, shaderInterface, isImmutable, images, *descriptorSet, setNdx, layout, updateTemplates, updateRegistry);
			else if (descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
				writeImageSamplerDescriptorSetWithTemplate(vki, device, descriptorSetCount, shaderInterface, isImmutable, images, *descriptorSet, setNdx, layout, updateTemplates, updateRegistry);
			else
				DE_FATAL("Impossible");
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			if (descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				writeSamplerDescriptorSetWithTemplate(vki, device, descriptorSetCount, shaderInterface, isImmutable, images, DE_NULL, setNdx, layout, updateTemplates, updateRegistry, true, pipelineLayout);
			else if (descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
				writeImageSamplerDescriptorSetWithTemplate(vki, device, descriptorSetCount, shaderInterface, isImmutable, images, DE_NULL, setNdx, layout, updateTemplates, updateRegistry, true, pipelineLayout);
			else
				DE_FATAL("Impossible");
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
		{
			if (descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				writeSamplerDescriptorSet(vki, device, shaderInterface, isImmutable, images, *descriptorSet, setNdx, updateBuilder, descriptorsPerSet, updateMethod);
			else if (descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
				writeImageSamplerDescriptorSet(vki, device, shaderInterface, isImmutable, images, *descriptorSet, setNdx, updateBuilder, descriptorsPerSet, updateMethod);
			else
				DE_FATAL("Impossible");
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
		{
			if (descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				writeSamplerDescriptorSet(vki, device, shaderInterface, isImmutable, images, *descriptorSet, setNdx, updateBuilder, descriptorsPerSet);
			else if (descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
				writeImageSamplerDescriptorSet(vki, device, shaderInterface, isImmutable, images, *descriptorSet, setNdx, updateBuilder, descriptorsPerSet);
			else
				DE_FATAL("Impossible");
		}

		descriptorSets.push_back(DescriptorSetHandleSp(new DescriptorSetHandleUp(descriptorSet)));
	}
	return descriptorSets;
}

void ImageSampleRenderInstance::writeSamplerDescriptorSet (const vk::DeviceInterface&		vki,
														   vk::VkDevice						device,
														   ShaderInputInterface				shaderInterface,
														   bool								isImmutable,
														   const ImageSampleInstanceImages&	images,
														   vk::VkDescriptorSet				descriptorSet,
														   deUint32							setNdx,
														   vk::DescriptorSetUpdateBuilder&	updateBuilder,
														   std::vector<deUint32>&			descriptorsPerSet,
														   DescriptorUpdateMethod			updateMethod)
{
	const vk::VkDescriptorImageInfo		imageInfo			= makeDescriptorImageInfo(images.getImageView(setNdx), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
	const vk::VkDescriptorImageInfo		samplersInfos[2]	=
	{
		makeDescriptorImageInfo(images.getSampler(setNdx * getInterfaceNumResources(shaderInterface))),
		makeDescriptorImageInfo(images.getSampler(setNdx * getInterfaceNumResources(shaderInterface) + 1)),
	};

	const deUint32						samplerLocation		= shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS ? 1u : 0u;
	deUint32							numDescriptors		= 1u;

	// stand alone texture
	updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(samplerLocation), vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, &imageInfo);

	// samplers
	if (!isImmutable || (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH))
	{
		switch (shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(1u), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[0]);
				numDescriptors++;
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(1u), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[0]);
				updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(2u), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[1]);
				numDescriptors += 2;
				break;

			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[0]);
				updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(2u), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[1]);
				numDescriptors += 2;
				break;

			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[0]);
				updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[1]);
				numDescriptors += 2;
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(1u), vk::VK_DESCRIPTOR_TYPE_SAMPLER, 2u, samplersInfos);
				numDescriptors++;
				break;

			default:
				DE_FATAL("Impossible");
		}
	}

	descriptorsPerSet.push_back(numDescriptors);

	if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		updateBuilder.update(vki, device);
		updateBuilder.clear();
	}
}

void ImageSampleRenderInstance::writeImageSamplerDescriptorSet (const vk::DeviceInterface&			vki,
																vk::VkDevice						device,
																ShaderInputInterface				shaderInterface,
																bool								isImmutable,
																const ImageSampleInstanceImages&	images,
																vk::VkDescriptorSet					descriptorSet,
																deUint32							setNdx,
																vk::DescriptorSetUpdateBuilder&		updateBuilder,
																std::vector<deUint32>&				descriptorsPerSet,
																DescriptorUpdateMethod				updateMethod)
{
	const vk::VkSampler					samplers[2]			=
	{
		(isImmutable && updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH) ? (0) : (images.getSampler(setNdx * getInterfaceNumResources(shaderInterface))),
		(isImmutable && updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH) ? (0) : (images.getSampler(setNdx * getInterfaceNumResources(shaderInterface) + 1)),
	};
	const vk::VkDescriptorImageInfo		imageSamplers[2]	=
	{
		vk::makeDescriptorImageInfo(samplers[0], images.getImageView(setNdx * getInterfaceNumResources(shaderInterface)), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL),
		vk::makeDescriptorImageInfo(samplers[1], images.getImageView(setNdx * getInterfaceNumResources(shaderInterface) + 1), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL),
	};
	deUint32							numDescriptors		= 0u;

	// combined image samplers
	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[0]);
			numDescriptors++;
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(1u), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(2u), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 2u, imageSamplers);
			numDescriptors++;
			break;

		default:
			DE_FATAL("Impossible");
	}

	descriptorsPerSet.push_back(numDescriptors);

	if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		updateBuilder.update(vki, device);
		updateBuilder.clear();
	}
}

void ImageSampleRenderInstance::writeSamplerDescriptorSetWithTemplate (const vk::DeviceInterface&					vki,
																	   vk::VkDevice									device,
																	   DescriptorSetCount							descriptorSetCount,
																	   ShaderInputInterface							shaderInterface,
																	   bool											isImmutable,
																	   const ImageSampleInstanceImages&				images,
																	   vk::VkDescriptorSet							descriptorSet,
																	   deUint32										setNdx,
																	   vk::VkDescriptorSetLayout					layout,
																	   std::vector<UpdateTemplateHandleSp>&			updateTemplates,
																	   std::vector<RawUpdateRegistry>&				registry,
																	   bool											withPush,
																	   vk::VkPipelineLayout							pipelineLayout)
{
	const vk::VkDescriptorImageInfo							imageInfo			= makeDescriptorImageInfo(images.getImageView(setNdx), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
	const vk::VkDescriptorImageInfo							samplersInfos[2]	=
	{
		makeDescriptorImageInfo(images.getSampler(setNdx * getInterfaceNumResources(shaderInterface))),
		makeDescriptorImageInfo(images.getSampler(setNdx * getInterfaceNumResources(shaderInterface) + 1)),
	};

	const deUint32											samplerLocation		= shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS ? 1u : 0u;

	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// updateCount
		DE_NULL,	// pUpdates
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_GRAPHICS,
		pipelineLayout,
		getDescriptorSetNdx(descriptorSetCount, setNdx)
	};

	RawUpdateRegistry updateRegistry;

	updateRegistry.addWriteObject(imageInfo);
	updateRegistry.addWriteObject(samplersInfos[0]);
	updateRegistry.addWriteObject(samplersInfos[1]);

	// stand alone texture
	updateEntries.push_back(createTemplateBinding(samplerLocation, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, updateRegistry.getWriteObjectOffset(0), 0));

	// samplers
	if (!isImmutable || withPush)
	{
		switch (shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				updateEntries.push_back(createTemplateBinding(1, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(1), 0));
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				updateEntries.push_back(createTemplateBinding(1, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(1), 0));
				updateEntries.push_back(createTemplateBinding(2, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(2), 0));
				break;

			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				updateEntries.push_back(createTemplateBinding(0, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(1), 0));
				updateEntries.push_back(createTemplateBinding(2, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(2), 0));
				break;

			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(1), 0));
				updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(2), 0));
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				updateEntries.push_back(createTemplateBinding(1, 0, 2, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(1), sizeof(samplersInfos[0])));
				break;

			default:
				DE_FATAL("Impossible");
		}
	}

	templateCreateInfo.pDescriptorUpdateEntries		= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount	= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(vki, device, &templateCreateInfo);
	updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	registry.push_back(updateRegistry);

	if (!withPush)
	{
		vki.updateDescriptorSetWithTemplate(device, descriptorSet, **updateTemplates.back(), registry.back().getRawPointer());
	}

}

void ImageSampleRenderInstance::writeImageSamplerDescriptorSetWithTemplate (const vk::DeviceInterface&						vki,
																			vk::VkDevice									device,
																			DescriptorSetCount								descriptorSetCount,
																			ShaderInputInterface							shaderInterface,
																			bool											isImmutable,
																			const ImageSampleInstanceImages&				images,
																			vk::VkDescriptorSet								descriptorSet,
																			deUint32										setNdx,
																			vk::VkDescriptorSetLayout						layout,
																			std::vector<UpdateTemplateHandleSp>&			updateTemplates,
																			std::vector<RawUpdateRegistry>&					registry,
																			bool											withPush,
																			vk::VkPipelineLayout							pipelineLayout)
{
	const vk::VkSampler					samplers[2]			=
	{
		(isImmutable && !withPush) ? (0) : (images.getSampler(setNdx * getInterfaceNumResources(shaderInterface))),
		(isImmutable && !withPush) ? (0) : (images.getSampler(setNdx * getInterfaceNumResources(shaderInterface) + 1)),
	};
	const vk::VkDescriptorImageInfo		imageSamplers[2]	=
	{
		vk::makeDescriptorImageInfo(samplers[0], images.getImageView(setNdx * getInterfaceNumResources(shaderInterface)), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL),
		vk::makeDescriptorImageInfo(samplers[1], images.getImageView(setNdx * getInterfaceNumResources(shaderInterface) + 1), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL),
	};

	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// updateCount
		DE_NULL,	// pUpdates
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_GRAPHICS,
		pipelineLayout,
		getDescriptorSetNdx(descriptorSetCount, setNdx)
	};

	RawUpdateRegistry updateRegistry;

	updateRegistry.addWriteObject(imageSamplers[0]);
	updateRegistry.addWriteObject(imageSamplers[1]);

	// combined image samplers
	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(0), 0));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(1, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(2, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateEntries.push_back(createTemplateBinding(0, 0, 2, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(0), sizeof(imageSamplers[0])));
			break;

		default:
			DE_FATAL("Impossible");
	}

	templateCreateInfo.pDescriptorUpdateEntries		= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount	= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(vki, device, &templateCreateInfo);
	updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	registry.push_back(updateRegistry);

	if (!withPush)
	{
		vki.updateDescriptorSetWithTemplate(device, descriptorSet, **updateTemplates.back(), registry.back().getRawPointer());
	}
}

void ImageSampleRenderInstance::logTestPlan (void) const
{
	std::ostringstream msg;

	msg << "Rendering 2x2 grid.\n";

	if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
	{
		msg << ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
			<< "Each descriptor set contains "
			<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
			<< " VK_DESCRIPTOR_TYPE_SAMPLER descriptor(s) and a single texture.\n";
	}
	else if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
	{
		msg << ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
			<< "Each descriptor set contains "
			<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
			<< " VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER descriptor(s).\n";
	}
	else
		DE_FATAL("Impossible");

	msg << "Image view type is " << vk::getImageViewTypeName(m_viewType) << "\n";

	if (m_baseMipLevel)
		msg << "Image view base mip level = " << m_baseMipLevel << "\n";
	if (m_baseArraySlice)
		msg << "Image view base array slice = " << m_baseArraySlice << "\n";

	if (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR)
		msg << "Sampler mode is LINEAR, with WRAP\n";
	else
		msg << "Sampler 0 mode is LINEAR, with WRAP\nSampler 1 mode is NEAREST with CLAMP\n";

	if (m_stageFlags == 0u)
	{
		msg << "Descriptors are not accessed in any shader stage.\n";
	}
	else
	{
		msg << "Color in each cell is fetched using the descriptor(s):\n";

		for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
		{
			msg << "Test sample " << resultNdx << ": sample at position " << m_images.getSamplePos(m_viewType, m_baseMipLevel, m_baseArraySlice, resultNdx);

			if (m_shaderInterface != SHADER_INPUT_SINGLE_DESCRIPTOR)
			{
				const int srcResourceNdx = (resultNdx % 2); // ABAB source

				if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
					msg << " using sampler " << srcResourceNdx;
				else if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
					msg << " from combined image sampler " << srcResourceNdx;
				else
					DE_FATAL("Impossible");
			}
			msg << "\n";
		}

		msg << "Descriptors are accessed in {"
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_VERTEX_BIT) != 0)					? (" vertex")			: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0)	? (" tess_control")		: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT) != 0)	? (" tess_evaluation")	: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_GEOMETRY_BIT) != 0)				? (" geometry")			: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_FRAGMENT_BIT) != 0)				? (" fragment")			: (""))
			<< " } stages.";
	}

	m_context.getTestContext().getLog()
		<< tcu::TestLog::Message
		<< msg.str()
		<< tcu::TestLog::EndMessage;
}

vk::VkPipelineLayout ImageSampleRenderInstance::getPipelineLayout (void) const
{
	return *m_pipelineLayout;
}

void ImageSampleRenderInstance::writeDrawCmdBuffer (vk::VkCommandBuffer cmd) const
{
	if (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE && m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		std::vector<vk::VkDescriptorSet> setHandles;
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			setHandles.push_back(**m_descriptorSets[setNdx]);

		switch (m_descriptorSetCount)
		{
			case DESCRIPTOR_SET_COUNT_SINGLE:
			case DESCRIPTOR_SET_COUNT_MULTIPLE:
			{
				m_vki.cmdBindDescriptorSets(cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, getPipelineLayout(), 0u, (int)setHandles.size(), &setHandles.front(), 0u, DE_NULL);
				break;
			}
			case DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS:
			{
				for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
				{
					const deUint32 descriptorSetNdx = getDescriptorSetNdx(m_descriptorSetCount, setNdx);
					m_vki.cmdBindDescriptorSets(cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, getPipelineLayout(), descriptorSetNdx, 1u, &setHandles[setNdx], 0u, DE_NULL);
				}
				break;
			}
			default:
				DE_FATAL("Impossible");
		}
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
		{
			const deUint32 descriptorSetNdx = getDescriptorSetNdx(m_descriptorSetCount, setNdx);
			m_vki.cmdPushDescriptorSetWithTemplateKHR(cmd, **m_updateTemplates[setNdx], getPipelineLayout(), descriptorSetNdx, (const void*)m_updateRegistry[setNdx].getRawPointer());
		}
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		deUint32 descriptorNdx = 0u;
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
		{
			const deUint32	descriptorSetNdx	= getDescriptorSetNdx(m_descriptorSetCount, setNdx);
			const deUint32	numDescriptors		= m_descriptorsPerSet[setNdx];
			m_updateBuilder.updateWithPush(m_vki, cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, *m_pipelineLayout, descriptorSetNdx, descriptorNdx, numDescriptors);
			descriptorNdx += numDescriptors;
		}
	}

	m_vki.cmdDraw(cmd, 6u * 4u, 1u, 0u, 0u); // render four quads (two separate triangles)
}

tcu::TestStatus ImageSampleRenderInstance::verifyResultImage (const tcu::ConstPixelBufferAccess& result) const
{
	const deUint32		numDescriptorSets	= getDescriptorSetCount(m_descriptorSetCount);
	const tcu::Vec4		green				(0.0f, 1.0f, 0.0f, 1.0f);
	const tcu::Vec4		yellow				(1.0f, 1.0f, 0.0f, 1.0f);
	const bool			doFetch				= (m_stageFlags != 0u); // no active stages? Then don't fetch
	const tcu::RGBA		threshold			= tcu::RGBA(8, 8, 8, 8); // source image is high-frequency so the threshold is quite large to tolerate sampling errors

	tcu::Surface		reference			(m_targetSize.x(), m_targetSize.y());

	tcu::Vec4			sample0				= tcu::Vec4(0.0f);
	tcu::Vec4			sample1				= tcu::Vec4(0.0f);
	tcu::Vec4			sample2				= tcu::Vec4(0.0f);
	tcu::Vec4			sample3				= tcu::Vec4(0.0f);

	for (deUint32 setNdx = 0; setNdx < numDescriptorSets; setNdx++)
	{
		sample0 += (!doFetch) ? (yellow)	: (m_images.fetchSampleValue(0, setNdx));
		sample1 += (!doFetch) ? (green)		: (m_images.fetchSampleValue(1, setNdx));
		sample2 += (!doFetch) ? (green)		: (m_images.fetchSampleValue(2, setNdx));
		sample3 += (!doFetch) ? (yellow)	: (m_images.fetchSampleValue(3, setNdx));
	}

	if (numDescriptorSets > 1)
	{
		sample0 = sample0 / tcu::Vec4(float(numDescriptorSets));
		sample1 = sample1 / tcu::Vec4(float(numDescriptorSets));
		sample2 = sample2 / tcu::Vec4(float(numDescriptorSets));
		sample3 = sample3 / tcu::Vec4(float(numDescriptorSets));
	}

	drawQuadrantReferenceResult(reference.getAccess(), sample0, sample1, sample2, sample3);

	if (!bilinearCompare(m_context.getTestContext().getLog(), "Compare", "Result comparison", reference.getAccess(), result, threshold, tcu::COMPARE_LOG_RESULT))
		return tcu::TestStatus::fail("Image verification failed");
	else
		return tcu::TestStatus::pass("Pass");
}

class ImageSampleComputeInstance : public vkt::TestInstance
{
public:
												ImageSampleComputeInstance					(vkt::Context&			context,
																							 DescriptorUpdateMethod	updateMethod,
																							 vk::VkDescriptorType	descriptorType,
																							 DescriptorSetCount		descriptorSetCount,
																							 ShaderInputInterface	shaderInterface,
																							 vk::VkImageViewType	viewType,
																							 deUint32				baseMipLevel,
																							 deUint32				baseArraySlice,
																							 bool					isImmutableSampler);

private:
	vk::Move<vk::VkDescriptorSetLayout>			createDescriptorSetLayout					(deUint32 setNdx) const;
	vk::Move<vk::VkDescriptorPool>				createDescriptorPool						(void) const;
	vk::Move<vk::VkDescriptorSet>				createDescriptorSet							(vk::VkDescriptorPool pool, vk::VkDescriptorSetLayout layout, deUint32 setNdx);
	void										writeDescriptorSet							(vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, vk::VkPipelineLayout pipelineLayout = DE_NULL);
	void										writeImageSamplerDescriptorSet				(vk::VkDescriptorSet descriptorSet, deUint32 setNdx);
	void										writeImageSamplerDescriptorSetWithTemplate	(vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, bool withPush = false, vk::VkPipelineLayout pipelineLayout = DE_NULL);
	void										writeSamplerDescriptorSet					(vk::VkDescriptorSet descriptorSet, deUint32 setNdx);
	void										writeSamplerDescriptorSetWithTemplate		(vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, bool withPush = false, vk::VkPipelineLayout pipelineLayout = DE_NULL);

	tcu::TestStatus								iterate										(void);
	void										logTestPlan									(void) const;
	tcu::TestStatus								testResourceAccess							(void);

	const DescriptorUpdateMethod				m_updateMethod;
	const vk::VkDescriptorType					m_descriptorType;
	const DescriptorSetCount					m_descriptorSetCount;
	const ShaderInputInterface					m_shaderInterface;
	const vk::VkImageViewType					m_viewType;
	const deUint32								m_baseMipLevel;
	const deUint32								m_baseArraySlice;
	const bool									m_isImmutableSampler;
	std::vector<UpdateTemplateHandleSp>			m_updateTemplates;

	const vk::DeviceInterface&					m_vki;
	const vk::VkDevice							m_device;
	const vk::VkQueue							m_queue;
	const deUint32								m_queueFamilyIndex;
	vk::Allocator&								m_allocator;
	const ComputeInstanceResultBuffer			m_result;
	const ImageSampleInstanceImages				m_images;
	std::vector<RawUpdateRegistry>				m_updateRegistry;
	vk::DescriptorSetUpdateBuilder				m_updateBuilder;
	std::vector<deUint32>						m_descriptorsPerSet;
};

ImageSampleComputeInstance::ImageSampleComputeInstance (Context&				context,
														DescriptorUpdateMethod	updateMethod,
														vk::VkDescriptorType	descriptorType,
														DescriptorSetCount		descriptorSetCount,
														ShaderInputInterface	shaderInterface,
														vk::VkImageViewType		viewType,
														deUint32				baseMipLevel,
														deUint32				baseArraySlice,
														bool					isImmutableSampler)
	: vkt::TestInstance		(context)
	, m_updateMethod		(updateMethod)
	, m_descriptorType		(descriptorType)
	, m_descriptorSetCount	(descriptorSetCount)
	, m_shaderInterface		(shaderInterface)
	, m_viewType			(viewType)
	, m_baseMipLevel		(baseMipLevel)
	, m_baseArraySlice		(baseArraySlice)
	, m_isImmutableSampler	(isImmutableSampler)
	, m_updateTemplates		()
	, m_vki					(context.getDeviceInterface())
	, m_device				(context.getDevice())
	, m_queue				(context.getUniversalQueue())
	, m_queueFamilyIndex	(context.getUniversalQueueFamilyIndex())
	, m_allocator			(context.getDefaultAllocator())
	, m_result				(m_vki, m_device, m_allocator)
	, m_images				(m_vki, m_device, m_queueFamilyIndex, m_queue, m_allocator, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_viewType, m_baseMipLevel, m_baseArraySlice, isImmutableSampler)
	, m_updateRegistry		()
	, m_updateBuilder		()
	, m_descriptorsPerSet	()
{
}

vk::Move<vk::VkDescriptorSetLayout> ImageSampleComputeInstance::createDescriptorSetLayout (deUint32 setNdx) const
{
	const vk::VkSampler						samplers[2] =
	{
		m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface)),
		m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface) + 1),
	};

	vk::DescriptorSetLayoutBuilder			builder;
	vk::VkDescriptorSetLayoutCreateFlags	extraFlags	= 0;
	deUint32								binding		= 0;

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE ||
			m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		extraFlags |= vk::VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR;
	}

	// result buffer
	if (setNdx == 0)
		builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++);

	// (combined)samplers follow
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++);
			builder.addSingleIndexedSamplerBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++, (m_images.isImmutable()) ? (&samplers[0]) : (DE_NULL));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++);
			builder.addSingleIndexedSamplerBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++, (m_images.isImmutable()) ? (&samplers[0]) : (DE_NULL));
			builder.addSingleIndexedSamplerBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++, (m_images.isImmutable()) ? (&samplers[1]) : (DE_NULL));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			builder.addSingleIndexedSamplerBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding, (m_images.isImmutable()) ? (&samplers[0]) : (DE_NULL));
			if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding + 1u);
			builder.addSingleIndexedSamplerBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding + 2u, (m_images.isImmutable()) ? (&samplers[1]) : (DE_NULL));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++);
			builder.addSingleIndexedSamplerBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, getArbitraryBindingIndex(0), (m_images.isImmutable()) ? (&samplers[0]) : (DE_NULL));
			builder.addSingleIndexedSamplerBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, getArbitraryBindingIndex(1), (m_images.isImmutable()) ? (&samplers[1]) : (DE_NULL));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++);
			builder.addArraySamplerBinding(m_descriptorType, 2u, vk::VK_SHADER_STAGE_COMPUTE_BIT, (m_images.isImmutable()) ? (samplers) : (DE_NULL));
			break;

		default:
			DE_FATAL("Impossible");
	};

	return builder.build(m_vki, m_device, extraFlags);
}

vk::Move<vk::VkDescriptorPool> ImageSampleComputeInstance::createDescriptorPool (void) const
{
	vk::DescriptorPoolBuilder builder;

	builder.addType(vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER);
	builder.addType(m_descriptorType, getDescriptorSetCount(m_descriptorSetCount) * getInterfaceNumResources(m_shaderInterface));

	if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
		builder.addType(vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, getDescriptorSetCount(m_descriptorSetCount));

	return builder.build(m_vki, m_device, vk::VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, getDescriptorSetCount(m_descriptorSetCount));
}

vk::Move<vk::VkDescriptorSet> ImageSampleComputeInstance::createDescriptorSet (vk::VkDescriptorPool pool, vk::VkDescriptorSetLayout layout, deUint32 setNdx)
{
	const vk::VkDescriptorSetAllocateInfo	allocInfo		=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
		DE_NULL,
		pool,
		1u,
		&layout
	};

	if (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE && m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		vk::Move<vk::VkDescriptorSet>			descriptorSet	= allocateDescriptorSet(m_vki, m_device, &allocInfo);
		writeDescriptorSet(*descriptorSet, layout, setNdx);

		return descriptorSet;
	}

	return vk::Move<vk::VkDescriptorSet>();
}

void ImageSampleComputeInstance::writeDescriptorSet (vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, vk::VkPipelineLayout pipelineLayout)
{
	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE)
	{
		if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
			writeSamplerDescriptorSetWithTemplate(descriptorSet, layout, setNdx);
		else if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
			writeImageSamplerDescriptorSetWithTemplate(descriptorSet, layout, setNdx);
		else
			DE_FATAL("Impossible");
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
			writeSamplerDescriptorSetWithTemplate(descriptorSet, layout, setNdx, true, pipelineLayout);
		else if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
			writeImageSamplerDescriptorSetWithTemplate(descriptorSet, layout, setNdx, true, pipelineLayout);
		else
			DE_FATAL("Impossible");
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
			writeSamplerDescriptorSet(descriptorSet, setNdx);
		else if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
			writeImageSamplerDescriptorSet(descriptorSet, setNdx);
		else
			DE_FATAL("Impossible");
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
			writeSamplerDescriptorSet(descriptorSet, setNdx);
		else if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
			writeImageSamplerDescriptorSet(descriptorSet, setNdx);
		else
			DE_FATAL("Impossible");
	}
}

void ImageSampleComputeInstance::writeSamplerDescriptorSet (vk::VkDescriptorSet descriptorSet, deUint32 setNdx)
{
	const vk::VkDescriptorBufferInfo	resultInfo			= vk::makeDescriptorBufferInfo(m_result.getBuffer(), 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkDescriptorImageInfo		imageInfo			= makeDescriptorImageInfo(m_images.getImageView(setNdx), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
	const vk::VkDescriptorImageInfo		samplersInfos[2]	=
	{
		makeDescriptorImageInfo(m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface))),
		makeDescriptorImageInfo(m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface) + 1)),
	};
	deUint32							binding				= 0u;
	deUint32							numDescriptors		= 0u;

	// result
	if (setNdx == 0)
	{
		m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, &resultInfo);
		numDescriptors++;
	}

	// stand alone texture
	{
		const deUint32 texutreBinding = (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? (binding + 1) : (binding++);
		m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(texutreBinding), vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, &imageInfo);
		numDescriptors++;
	}

	// samplers
	if (!m_isImmutableSampler || (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH))
	{
		switch (m_shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[0]);
				numDescriptors++;
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[0]);
				m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[1]);
				numDescriptors += 2;
				break;

			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[0]);
				m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding + 2), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[1]);
				numDescriptors += 2;
				break;

			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[0]);
				m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), vk::VK_DESCRIPTOR_TYPE_SAMPLER, &samplersInfos[1]);
				numDescriptors += 2;
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				m_updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_SAMPLER, 2u, samplersInfos);
				numDescriptors++;
				break;

			default:
				DE_FATAL("Impossible");
		}
	}

	m_descriptorsPerSet.push_back(numDescriptors);

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		m_updateBuilder.update(m_vki, m_device);
		m_updateBuilder.clear();
	}
}

void ImageSampleComputeInstance::writeSamplerDescriptorSetWithTemplate (vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, bool withPush, vk::VkPipelineLayout pipelineLayout)
{
	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	const vk::VkDescriptorBufferInfo						resultInfo			= vk::makeDescriptorBufferInfo(m_result.getBuffer(), 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkDescriptorImageInfo							imageInfo			= makeDescriptorImageInfo(m_images.getImageView(setNdx), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
	const vk::VkDescriptorImageInfo							samplersInfos[2]	=
	{
		makeDescriptorImageInfo(m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface))),
		makeDescriptorImageInfo(m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface) + 1)),
	};
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// updateCount
		DE_NULL,	// pUpdates
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_COMPUTE,
		pipelineLayout,
		getDescriptorSetNdx(m_descriptorSetCount, setNdx)
	};
	deUint32												binding				= 0u;
	deUint32												offset				= 0u;
	RawUpdateRegistry										updateRegistry;

	if (setNdx == 0)
		updateRegistry.addWriteObject(resultInfo);

	updateRegistry.addWriteObject(imageInfo);
	updateRegistry.addWriteObject(samplersInfos[0]);
	updateRegistry.addWriteObject(samplersInfos[1]);

	// result
	if (setNdx == 0)
		updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, updateRegistry.getWriteObjectOffset(offset++), 0));

	// stand alone texture
	{
		const deUint32 textureBinding = (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? (binding + 1) : (binding++);
		updateEntries.push_back(createTemplateBinding(textureBinding, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, updateRegistry.getWriteObjectOffset(offset++), 0));
	}

	// samplers
	if (!m_isImmutableSampler || withPush)
	{
		switch (m_shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
				updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
				break;

			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				updateEntries.push_back(createTemplateBinding(binding, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
				updateEntries.push_back(createTemplateBinding(binding + 2, 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
				break;

			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
				updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				updateEntries.push_back(createTemplateBinding(binding++, 0, 2, vk::VK_DESCRIPTOR_TYPE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), sizeof(samplersInfos[0])));
				break;

			default:
				DE_FATAL("Impossible");
		}
	}

	templateCreateInfo.pDescriptorUpdateEntries		= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount	= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(m_vki, m_device, &templateCreateInfo);
	m_updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	m_updateRegistry.push_back(updateRegistry);

	if (!withPush)
	{
		m_vki.updateDescriptorSetWithTemplate(m_device, descriptorSet, **m_updateTemplates.back(), m_updateRegistry.back().getRawPointer());
	}
}

void ImageSampleComputeInstance::writeImageSamplerDescriptorSet (vk::VkDescriptorSet descriptorSet, deUint32 setNdx)
{
	const vk::VkDescriptorBufferInfo	resultInfo			= vk::makeDescriptorBufferInfo(m_result.getBuffer(), 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkSampler					samplers[2]			=
	{
		(m_isImmutableSampler && (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)) ? (0) : (m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface))),
		(m_isImmutableSampler && (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)) ? (0) : (m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface) + 1)),
	};
	const vk::VkDescriptorImageInfo		imageSamplers[2]	=
	{
		makeDescriptorImageInfo(samplers[0], m_images.getImageView(setNdx * getInterfaceNumResources(m_shaderInterface)), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL),
		makeDescriptorImageInfo(samplers[1], m_images.getImageView(setNdx * getInterfaceNumResources(m_shaderInterface) + 1), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL),
	};
	deUint32							binding				= 0u;
	deUint32							numDescriptors		= 0u;

	// result
	if (setNdx == 0)
	{
		m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, &resultInfo);
		numDescriptors++;
	}

	// combined image samplers
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[0]);
			numDescriptors++;
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding + 2u), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, &imageSamplers[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			m_updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 2u, imageSamplers);
			numDescriptors++;
			break;

		default:
			DE_FATAL("Impossible");
	}

	m_descriptorsPerSet.push_back(numDescriptors);

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		m_updateBuilder.update(m_vki, m_device);
		m_updateBuilder.clear();
	}
}

void ImageSampleComputeInstance::writeImageSamplerDescriptorSetWithTemplate (vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, bool withPush, vk::VkPipelineLayout pipelineLayout)
{
	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	const vk::VkDescriptorBufferInfo						resultInfo			= vk::makeDescriptorBufferInfo(m_result.getBuffer(), 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkSampler										samplers[2]			=
	{
		(m_isImmutableSampler && !withPush) ? (0) : (m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface))),
		(m_isImmutableSampler && !withPush) ? (0) : (m_images.getSampler(setNdx * getInterfaceNumResources(m_shaderInterface) + 1)),
	};
	const vk::VkDescriptorImageInfo							imageSamplers[2]	=
	{
		makeDescriptorImageInfo(samplers[0], m_images.getImageView(setNdx * getInterfaceNumResources(m_shaderInterface)), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL),
		makeDescriptorImageInfo(samplers[1], m_images.getImageView(setNdx * getInterfaceNumResources(m_shaderInterface) + 1), vk::VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL),
	};
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// updateCount
		DE_NULL,	// pUpdates
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_COMPUTE,
		pipelineLayout,
		getDescriptorSetNdx(m_descriptorSetCount, setNdx)
	};

	deUint32												binding				= 0u;
	deUint32												offset				= 0u;
	RawUpdateRegistry										updateRegistry;

	if (setNdx == 0)
		updateRegistry.addWriteObject(resultInfo);

	updateRegistry.addWriteObject(imageSamplers[0]);
	updateRegistry.addWriteObject(imageSamplers[1]);

	// result
	if (setNdx == 0)
		updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, updateRegistry.getWriteObjectOffset(offset++), 0));

	// combined image samplers
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(binding, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(binding + 2, 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 2, vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, updateRegistry.getWriteObjectOffset(offset++), sizeof(imageSamplers[0])));
			break;

		default:
			DE_FATAL("Impossible");
	}

	templateCreateInfo.pDescriptorUpdateEntries		= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount	= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(m_vki, m_device, &templateCreateInfo);
	m_updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	m_updateRegistry.push_back(updateRegistry);

	if (!withPush)
	{
		m_vki.updateDescriptorSetWithTemplate(m_device, descriptorSet, **m_updateTemplates.back(), m_updateRegistry.back().getRawPointer());
	}
}

tcu::TestStatus ImageSampleComputeInstance::iterate (void)
{
	logTestPlan();
	return testResourceAccess();
}

void ImageSampleComputeInstance::logTestPlan (void) const
{
	std::ostringstream msg;

	msg << "Accessing resource in a compute program.\n";

	if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
	{
		msg << ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
			<< "Each descriptor set contains "
			<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
			<< " VK_DESCRIPTOR_TYPE_SAMPLER descriptor(s) and a single texture.\n";
	}
	else if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
	{
		msg << ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
			<< "Each descriptor set contains "
			<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
				(m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
			<< " VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER descriptor(s).\n";
	}
	else
		DE_FATAL("Impossible");

	msg << "Image view type is " << vk::getImageViewTypeName(m_viewType) << "\n";

	if (m_baseMipLevel)
		msg << "Image view base mip level = " << m_baseMipLevel << "\n";
	if (m_baseArraySlice)
		msg << "Image view base array slice = " << m_baseArraySlice << "\n";

	if (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR)
		msg << "Sampler mode is LINEAR, with WRAP\n";
	else
		msg << "Sampler 0 mode is LINEAR, with WRAP\nSampler 1 mode is NEAREST with CLAMP\n";

	for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
	{
		msg << "Test sample " << resultNdx << ": sample at position " << m_images.getSamplePos(m_viewType, m_baseMipLevel, m_baseArraySlice, resultNdx);

		if (m_shaderInterface != SHADER_INPUT_SINGLE_DESCRIPTOR)
		{
			const int srcResourceNdx = (resultNdx % 2); // ABAB source

			if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				msg << " using sampler " << srcResourceNdx;
			else if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER)
				msg << " from combined image sampler " << srcResourceNdx;
			else
				DE_FATAL("Impossible");
		}
		msg << "\n";
	}

	m_context.getTestContext().getLog()
		<< tcu::TestLog::Message
		<< msg.str()
		<< tcu::TestLog::EndMessage;
}

tcu::TestStatus ImageSampleComputeInstance::testResourceAccess (void)
{
	const vk::Unique<vk::VkDescriptorPool>			descriptorPool(createDescriptorPool());
	std::vector<DescriptorSetLayoutHandleSp>		descriptorSetLayouts;
	std::vector<DescriptorSetHandleSp>				descriptorSets;
	std::vector<vk::VkDescriptorSetLayout>			layoutHandles;
	std::vector<vk::VkDescriptorSet>				setHandles;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
	{
		vk::Move<vk::VkDescriptorSetLayout>	layout	= createDescriptorSetLayout(setNdx);
		vk::Move<vk::VkDescriptorSet>		set		= createDescriptorSet(*descriptorPool, *layout, setNdx);

		descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(layout)));
		descriptorSets.push_back(DescriptorSetHandleSp(new DescriptorSetHandleUp(set)));

		layoutHandles.push_back(**descriptorSetLayouts.back());
		setHandles.push_back(**descriptorSets.back());

		// Add an empty descriptor set layout between sets 0 and 2
		if (setNdx == 0 && m_descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS)
		{
			vk::DescriptorSetLayoutBuilder		emptyBuilder;
			vk::Move<vk::VkDescriptorSetLayout>	emptyLayout = emptyBuilder.build(m_vki, m_device, (vk::VkDescriptorSetLayoutCreateFlags)0);

			descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(emptyLayout)));
			layoutHandles.push_back(**descriptorSetLayouts.back());
		}
	}

	const ComputePipeline							pipeline			(m_vki, m_device, m_context.getBinaryCollection(), (int)layoutHandles.size(), &layoutHandles.front());
	const deUint32* const							dynamicOffsets		= DE_NULL;
	const int										numDynamicOffsets	= 0;
	const vk::VkBufferMemoryBarrier* const			preBarriers			= DE_NULL;
	const int										numPreBarriers		= 0;
	const vk::VkBufferMemoryBarrier* const			postBarriers		= m_result.getResultReadBarrier();
	const int										numPostBarriers		= 1;

	const ComputeCommand							compute				(m_vki,
																		 m_device,
																		 pipeline.getPipeline(),
																		 pipeline.getPipelineLayout(),
																		 tcu::UVec3(4, 1, 1),
																		 m_shaderInterface,
																		 m_descriptorSetCount,	&setHandles.front(),
																		 numDynamicOffsets,		dynamicOffsets,
																		 numPreBarriers,		preBarriers,
																		 numPostBarriers,		postBarriers);

	tcu::Vec4										results[4];
	bool											anyResultSet		= false;
	bool											allResultsOk		= true;

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			writeDescriptorSet(DE_NULL, layoutHandles[getDescriptorSetNdx(m_descriptorSetCount, setNdx)], setNdx, pipeline.getPipelineLayout()); // descriptor set not applicable

		compute.submitAndWait(m_queueFamilyIndex, m_queue, &m_updateTemplates, &m_updateRegistry);
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			writeDescriptorSet(DE_NULL, layoutHandles[getDescriptorSetNdx(m_descriptorSetCount, setNdx)], setNdx, pipeline.getPipelineLayout()); // descriptor set not applicable

		compute.submitAndWait(m_queueFamilyIndex, m_queue, m_updateBuilder, m_descriptorsPerSet);
	}
	else
	{
		compute.submitAndWait(m_queueFamilyIndex, m_queue);
	}
	m_result.readResultContentsTo(&results);

	// verify
	for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
	{
		// source image is high-frequency so the threshold is quite large to tolerate sampling errors
		const tcu::Vec4	samplingThreshold	= tcu::Vec4(8.0f / 255.0f);
		const tcu::Vec4	result				= results[resultNdx];
		tcu::Vec4		reference			= tcu::Vec4(0.0f);

		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			reference += m_images.fetchSampleValue(resultNdx, setNdx);

		reference = reference / tcu::Vec4((float)getDescriptorSetCount(m_descriptorSetCount));

		if (result != tcu::Vec4(-1.0f))
			anyResultSet = true;

		if (tcu::boolAny(tcu::greaterThan(tcu::abs(result - reference), samplingThreshold)))
		{
			allResultsOk = false;

			m_context.getTestContext().getLog()
				<< tcu::TestLog::Message
				<< "Test sample " << resultNdx << ":\n"
				<< "\tSampling at " << m_images.getSamplePos(m_viewType, m_baseMipLevel, m_baseArraySlice, resultNdx) << "\n"
				<< "\tError expected " << reference << ", got " << result
				<< tcu::TestLog::EndMessage;
		}
	}

	// read back and verify
	if (allResultsOk)
		return tcu::TestStatus::pass("Pass");
	else if (anyResultSet)
		return tcu::TestStatus::fail("Invalid result values");
	else
	{
		m_context.getTestContext().getLog()
			<< tcu::TestLog::Message
			<< "Result buffer was not written to."
			<< tcu::TestLog::EndMessage;
		return tcu::TestStatus::fail("Result buffer was not written to");
	}
}

class ImageDescriptorCase : public QuadrantRendederCase
{
public:
	enum
	{
		FLAG_BASE_MIP	= (1u << 1u),
		FLAG_BASE_SLICE	= (1u << 2u),
	};
	// enum continues where resource flags ends
	DE_STATIC_ASSERT((deUint32)FLAG_BASE_MIP == (deUint32)RESOURCE_FLAG_LAST);

								ImageDescriptorCase			(tcu::TestContext&		testCtx,
															 const char*			name,
															 const char*			description,
															 bool					isPrimaryCmdBuf,
															 DescriptorUpdateMethod updateMethod,
															 vk::VkDescriptorType	descriptorType,
															 vk::VkShaderStageFlags	exitingStages,
															 vk::VkShaderStageFlags	activeStages,
															 DescriptorSetCount		descriptorSetCount,
															 ShaderInputInterface	shaderInterface,
															 vk::VkImageViewType	viewType,
															 deUint32				flags);

private:
	std::string					genExtensionDeclarations	(vk::VkShaderStageFlagBits stage) const;
	std::string					genResourceDeclarations		(vk::VkShaderStageFlagBits stage, int numUsedBindings) const;
	std::string					genFetchCoordStr			(int fetchPosNdx) const;
	std::string					genSampleCoordStr			(int samplePosNdx) const;
	std::string					genResourceAccessSource		(vk::VkShaderStageFlagBits stage) const;
	std::string					genNoAccessSource			(void) const;

	vkt::TestInstance*			createInstance				(vkt::Context& context) const;

private:
	const bool						m_isPrimaryCmdBuf;
	const DescriptorUpdateMethod	m_updateMethod;
	const vk::VkDescriptorType		m_descriptorType;
	const DescriptorSetCount		m_descriptorSetCount;
	const ShaderInputInterface		m_shaderInterface;
	const vk::VkImageViewType		m_viewType;
	const deUint32					m_baseMipLevel;
	const deUint32					m_baseArraySlice;
	const bool						m_isImmutableSampler;
};

ImageDescriptorCase::ImageDescriptorCase (tcu::TestContext&			testCtx,
										  const char*				name,
										  const char*				description,
										  bool						isPrimaryCmdBuf,
										  DescriptorUpdateMethod	updateMethod,
										  vk::VkDescriptorType		descriptorType,
										  vk::VkShaderStageFlags	exitingStages,
										  vk::VkShaderStageFlags	activeStages,
										  DescriptorSetCount		descriptorSetCount,
										  ShaderInputInterface		shaderInterface,
										  vk::VkImageViewType		viewType,
										  deUint32					flags)
	: QuadrantRendederCase	(testCtx, name, description,
							 // \note 1D textures are not supported in ES
							 (viewType == vk::VK_IMAGE_VIEW_TYPE_1D || viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY) ? glu::GLSL_VERSION_440 : glu::GLSL_VERSION_310_ES,
							 exitingStages, activeStages, descriptorSetCount)
	, m_isPrimaryCmdBuf		(isPrimaryCmdBuf)
	, m_updateMethod		(updateMethod)
	, m_descriptorType		(descriptorType)
	, m_descriptorSetCount	(descriptorSetCount)
	, m_shaderInterface		(shaderInterface)
	, m_viewType			(viewType)
	, m_baseMipLevel		(((flags & FLAG_BASE_MIP) != 0) ? (1u) : (0u))
	, m_baseArraySlice		(((flags & FLAG_BASE_SLICE) != 0) ? (1u) : (0u))
	, m_isImmutableSampler	((flags & RESOURCE_FLAG_IMMUTABLE_SAMPLER) != 0)
{
}

std::string ImageDescriptorCase::genExtensionDeclarations (vk::VkShaderStageFlagBits stage) const
{
	DE_UNREF(stage);

	if (m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)
		return "#extension GL_OES_texture_cube_map_array : require\n";
	else
		return "";
}

std::string ImageDescriptorCase::genResourceDeclarations (vk::VkShaderStageFlagBits stage, int numUsedBindings) const
{
	DE_UNREF(stage);

	// Vulkan-style resources are arrays implicitly, OpenGL-style are not
	const std::string	dimensionBase	= (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D || m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)		? ("1D")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_2D || m_viewType == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY)		? ("2D")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_3D)															? ("3D")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE || m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)	? ("Cube")
										: (DE_NULL);
	const std::string	dimensionArray	= (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D || m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)		? ("1DArray")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_2D || m_viewType == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY)		? ("2DArray")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_3D)															? ("3D")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE || m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)	? ("CubeArray")
										: (DE_NULL);
	const std::string	dimension		= isImageViewTypeArray(m_viewType) ? dimensionArray : dimensionBase;
	const deUint32		numSets			= getDescriptorSetCount(m_descriptorSetCount);

	std::string buf;

	for (deUint32 setNdx = 0; setNdx < numSets; setNdx++)
	{
		// Result buffer is bound only to the first descriptor set in compute shader cases
		const int			descBinding		= numUsedBindings - ((m_activeStages & vk::VK_SHADER_STAGE_COMPUTE_BIT) ? (setNdx == 0 ? 0 : 1) : 0);
		const std::string	setNdxPostfix	= (numSets == 1) ? "" : de::toString(setNdx);
		const deUint32		descriptorSet	= getDescriptorSetNdx(m_descriptorSetCount, setNdx);

		switch (m_shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
			{
				switch (m_descriptorType)
				{
					case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet)  + ", binding = " + de::toString(descBinding) + ") uniform highp texture" + dimension + " u_separateTexture" + setNdxPostfix + ";\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 1) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + ";\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp sampler" + dimension + " u_combinedTextureSampler" + setNdxPostfix + ";\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp texture" + dimensionBase + " u_separateTexture" + setNdxPostfix + ";\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ", rgba8) readonly uniform highp image" + dimension + " u_image" + setNdxPostfix + ";\n";
						break;
					default:
						DE_FATAL("invalid descriptor");
				}
				break;
			}
			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			{
				switch (m_descriptorType)
				{
					case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
						if (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS)
							buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp texture" + dimension + " u_separateTexture" + setNdxPostfix + ";\n"
									"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 1) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "A;\n"
									"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 2) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "B;\n";
						else
							buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "A;\n"
									"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 1) + ") uniform highp texture" + dimension + " u_separateTexture" + setNdxPostfix + ";\n"
									"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 2) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp sampler" + dimension + " u_combinedTextureSampler" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 1) + ") uniform highp sampler" + dimension + " u_combinedTextureSampler" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp texture" + dimensionBase + " u_separateTexture" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 1) + ") uniform highp texture" + dimensionBase + " u_separateTexture" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ", rgba8) readonly uniform highp image" + dimension + " u_image" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 1) + ", rgba8) readonly uniform highp image" + dimension + " u_image" + setNdxPostfix + "B;\n";
						break;
					default:
						DE_FATAL("invalid descriptor");
				}
				break;
			}
			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			{
				switch (m_descriptorType)
				{
					case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 1) + ") uniform highp texture" + dimension + " u_separateTexture" + setNdxPostfix + ";\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 2) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp sampler" + dimension + " u_combinedTextureSampler" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 2) + ") uniform highp sampler" + dimension + " u_combinedTextureSampler" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp texture" + dimensionBase + " u_separateTexture" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 2) + ") uniform highp texture" + dimensionBase + " u_separateTexture" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ", rgba8) readonly uniform highp image" + dimension + " u_image" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 2) + ", rgba8) readonly uniform highp image" + dimension + " u_image" + setNdxPostfix + "B;\n";
						break;
					default:
						DE_FATAL("invalid descriptor");
				}
				break;
			}
			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			{
				switch (m_descriptorType)
				{
					case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp texture" + dimension + " u_separateTexture" + setNdxPostfix + ";\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(getArbitraryBindingIndex(0)) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(getArbitraryBindingIndex(1)) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(getArbitraryBindingIndex(0)) + ") uniform highp sampler" + dimension + " u_combinedTextureSampler" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(getArbitraryBindingIndex(1)) + ") uniform highp sampler" + dimension + " u_combinedTextureSampler" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(getArbitraryBindingIndex(0)) + ") uniform highp texture" + dimensionBase + " u_separateTexture" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(getArbitraryBindingIndex(1)) + ") uniform highp texture" + dimensionBase + " u_separateTexture" + setNdxPostfix + "B;\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(getArbitraryBindingIndex(0)) + ", rgba8) readonly uniform highp image" + dimension + " u_image" + setNdxPostfix + "A;\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(getArbitraryBindingIndex(1)) + ", rgba8) readonly uniform highp image" + dimension + " u_image" + setNdxPostfix + "B;\n";
						break;
					default:
						DE_FATAL("invalid descriptor");
				}
				break;
			}
			case SHADER_INPUT_DESCRIPTOR_ARRAY:
			{
				switch (m_descriptorType)
				{
					case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp texture" + dimension + " u_separateTexture" + setNdxPostfix + ";\n"
								"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding + 1) + ") uniform highp sampler u_separateSampler" + setNdxPostfix + "[2];\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp sampler" + dimension + " u_combinedTextureSampler" + setNdxPostfix + "[2];\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ") uniform highp texture" + dimensionBase + " u_separateTexture" + setNdxPostfix + "[2];\n";
						break;
					case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
						buf +=	"layout(set = " + de::toString(descriptorSet) + ", binding = " + de::toString(descBinding) + ", rgba8) readonly uniform highp image" + dimension + " u_image" + setNdxPostfix + "[2];\n";
						break;
					default:
						DE_FATAL("invalid descriptor");
				}
				break;
			}
			default:
				DE_FATAL("Impossible");
		}
	}
	return buf;
}

std::string ImageDescriptorCase::genFetchCoordStr (int fetchPosNdx) const
{
	DE_ASSERT(m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE || m_descriptorType == vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE);
	const tcu::IVec3 fetchPos = ImageFetchInstanceImages::getFetchPos(m_viewType, m_baseMipLevel, m_baseArraySlice, fetchPosNdx);

	if (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D)
	{
		return de::toString(fetchPos.x());
	}
	else if (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY || m_viewType == vk::VK_IMAGE_VIEW_TYPE_2D)
	{
		std::ostringstream buf;
		buf << "ivec2(" << fetchPos.x() << ", " << fetchPos.y() << ")";
		return buf.str();
	}
	else
	{
		std::ostringstream buf;
		buf << "ivec3(" << fetchPos.x() << ", " << fetchPos.y() << ", " << fetchPos.z() << ")";
		return buf.str();
	}
}

std::string ImageDescriptorCase::genSampleCoordStr (int samplePosNdx) const
{
	DE_ASSERT(m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER || m_descriptorType == vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER);
	const tcu::Vec4 fetchPos = ImageSampleInstanceImages::getSamplePos(m_viewType, m_baseMipLevel, m_baseArraySlice, samplePosNdx);

	if (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D)
	{
		std::ostringstream buf;
		buf << "float(" << fetchPos.x() << ")";
		return buf.str();
	}
	else if (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY || m_viewType == vk::VK_IMAGE_VIEW_TYPE_2D)
	{
		std::ostringstream buf;
		buf << "vec2(float(" << fetchPos.x() << "), float(" << fetchPos.y() << "))";
		return buf.str();
	}
	else if (m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)
	{
		std::ostringstream buf;
		buf << "vec4(float(" << fetchPos.x() << "), float(" << fetchPos.y() << "), float(" << fetchPos.z() << "), float(" << fetchPos.w() << "))";
		return buf.str();
	}
	else
	{
		std::ostringstream buf;
		buf << "vec3(float(" << fetchPos.x() << "), float(" << fetchPos.y() << "), float(" << fetchPos.z() << "))";
		return buf.str();
	}
}

std::string ImageDescriptorCase::genResourceAccessSource (vk::VkShaderStageFlagBits stage) const
{
	DE_UNREF(stage);

	const char* const	dimension		= (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D)			? ("1D")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY)	? ("1DArray")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_2D)			? ("2D")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY)	? ("2DArray")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_3D)			? ("3D")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE)		? ("Cube")
										: (m_viewType == vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)	? ("CubeArray")
										: (DE_NULL);
	const char* const	accessPostfixA	= (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR)						? ("")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS)		? ("A")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS)	? ("A")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS)		? ("A")
										: (m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY)						? ("[0]")
										: (DE_NULL);
	const char* const	accessPostfixB	= (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR)						? ("")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS)		? ("B")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS)	? ("B")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS)		? ("B")
										: (m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY)						? ("[1]")
										: (DE_NULL);
	const deUint32		numSets			= getDescriptorSetCount(m_descriptorSetCount);

	std::ostringstream	buf;

	buf << "	result_color = vec4(0.0);\n";

	for (deUint32 setNdx = 0; setNdx < numSets; setNdx++)
	{
		const std::string setNdxPostfix	= (numSets == 1) ? "" : de::toString(setNdx);

		switch (m_descriptorType)
		{
			case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
			case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
			{
				const std::string	coodStr[4]	=
				{
					genSampleCoordStr(0),
					genSampleCoordStr(1),
					genSampleCoordStr(2),
					genSampleCoordStr(3),
				};

				if (m_descriptorType == vk::VK_DESCRIPTOR_TYPE_SAMPLER)
				{
					buf << "	if (quadrant_id == 0)\n"
						<< "		result_color += textureLod(sampler" << dimension << "(u_separateTexture" << setNdxPostfix << ", u_separateSampler" << setNdxPostfix << accessPostfixA << "), " << coodStr[0] << ", 0.0);\n"
						<< "	else if (quadrant_id == 1)\n"
						<< "		result_color += textureLod(sampler" << dimension << "(u_separateTexture" << setNdxPostfix << ", u_separateSampler" << setNdxPostfix << accessPostfixB << "), " << coodStr[1] << ", 0.0);\n"
						<< "	else if (quadrant_id == 2)\n"
						<< "		result_color += textureLod(sampler" << dimension << "(u_separateTexture" << setNdxPostfix << ", u_separateSampler" << setNdxPostfix << accessPostfixA << "), " << coodStr[2] << ", 0.0);\n"
						<< "	else\n"
						<< "		result_color += textureLod(sampler" << dimension << "(u_separateTexture" << setNdxPostfix << ", u_separateSampler" << setNdxPostfix << accessPostfixB << "), " << coodStr[3] << ", 0.0);\n";
				}
				else
				{
					buf << "	if (quadrant_id == 0)\n"
						<< "		result_color += textureLod(u_combinedTextureSampler" << setNdxPostfix << accessPostfixA << ", " << coodStr[0] << ", 0.0);\n"
						<< "	else if (quadrant_id == 1)\n"
						<< "		result_color += textureLod(u_combinedTextureSampler" << setNdxPostfix << accessPostfixB << ", " << coodStr[1] << ", 0.0);\n"
						<< "	else if (quadrant_id == 2)\n"
						<< "		result_color += textureLod(u_combinedTextureSampler" << setNdxPostfix << accessPostfixA << ", " << coodStr[2] << ", 0.0);\n"
						<< "	else\n"
						<< "		result_color += textureLod(u_combinedTextureSampler" << setNdxPostfix << accessPostfixB << ", " << coodStr[3] << ", 0.0);\n";
				}
				break;
			}

			case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
			{
				const std::string	coodStr[4]	=
				{
					genFetchCoordStr(0),
					genFetchCoordStr(1),
					genFetchCoordStr(2),
					genFetchCoordStr(3),
				};

				buf << "	if (quadrant_id == 0)\n"
					<< "		result_color += imageLoad(u_image" << setNdxPostfix << accessPostfixA << ", " << coodStr[0] << ");\n"
					<< "	else if (quadrant_id == 1)\n"
					<< "		result_color += imageLoad(u_image" << setNdxPostfix << accessPostfixB << ", " << coodStr[1] << ");\n"
					<< "	else if (quadrant_id == 2)\n"
					<< "		result_color += imageLoad(u_image" << setNdxPostfix << accessPostfixA << ", " << coodStr[2] << ");\n"
					<< "	else\n"
					<< "		result_color += imageLoad(u_image" << setNdxPostfix << accessPostfixB << ", " << coodStr[3] << ");\n";
				break;
			}

			default:
				DE_FATAL("invalid descriptor");
		}
	}

	if (getDescriptorSetCount(m_descriptorSetCount) > 1)
		buf << "	result_color /= vec4(" << getDescriptorSetCount(m_descriptorSetCount) << ".0);\n";

	return buf.str();
}

std::string ImageDescriptorCase::genNoAccessSource (void) const
{
	return "	if (quadrant_id == 1 || quadrant_id == 2)\n"
			"		result_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
			"	else\n"
			"		result_color = vec4(1.0, 1.0, 0.0, 1.0);\n";
}

vkt::TestInstance* ImageDescriptorCase::createInstance (vkt::Context& context) const
{
	verifyDriverSupport(context.getUsedApiVersion(), context.getDeviceFeatures(), context.getDeviceExtensions(), m_updateMethod, m_descriptorType, m_activeStages, m_viewType);

	switch (m_descriptorType)
	{
		case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
		case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
			if (m_exitingStages == vk::VK_SHADER_STAGE_COMPUTE_BIT)
			{
				DE_ASSERT(m_isPrimaryCmdBuf);
				return new ImageSampleComputeInstance(context, m_updateMethod, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_viewType, m_baseMipLevel, m_baseArraySlice, m_isImmutableSampler);
			}
			else
				return new ImageSampleRenderInstance(context, m_updateMethod, m_isPrimaryCmdBuf, m_descriptorType, m_descriptorSetCount, m_activeStages, m_shaderInterface, m_viewType, m_baseMipLevel, m_baseArraySlice, m_isImmutableSampler);

		case vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
		case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
			if (m_exitingStages == vk::VK_SHADER_STAGE_COMPUTE_BIT)
			{
				DE_ASSERT(m_isPrimaryCmdBuf);
				return new ImageFetchComputeInstance(context, m_updateMethod, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_viewType, m_baseMipLevel, m_baseArraySlice);
			}
			else
				return new ImageFetchRenderInstance(context, m_updateMethod, m_isPrimaryCmdBuf, m_descriptorType, m_descriptorSetCount, m_activeStages, m_shaderInterface, m_viewType, m_baseMipLevel, m_baseArraySlice);

		default:
			DE_FATAL("Impossible");
			return DE_NULL;
	}
}

class TexelBufferInstanceBuffers
{
public:
											TexelBufferInstanceBuffers	(vkt::Context&									context,
																		 const vk::DeviceInterface&						vki,
																		 vk::VkDevice									device,
																		 vk::Allocator&									allocator,
																		 vk::VkDescriptorType							descriptorType,
																		 DescriptorSetCount								descriptorSetCount,
																		 ShaderInputInterface							shaderInterface,
																		 bool											hasViewOffset);

private:
	static std::vector<de::ArrayBuffer<deUint8> >	createSourceBuffers		(tcu::TextureFormat								imageFormat,
																			 deUint32										numTexelBuffers);

	static std::vector<tcu::ConstPixelBufferAccess>	createSourceViews		(const std::vector<de::ArrayBuffer<deUint8> >&	sourceBuffers,
																			 tcu::TextureFormat								imageFormat,
																			 deUint32										numTexelBuffers,
																			 deUint32										viewOffset);

	static std::vector<BufferHandleSp>				createBuffers			(const vk::DeviceInterface&						vki,
																			 vk::VkDevice									device,
																			 vk::Allocator&									allocator,
																			 vk::VkDescriptorType							descriptorType,
																			 const std::vector<de::ArrayBuffer<deUint8> >&	sourceBuffers,
																			 std::vector<AllocationSp>&						bufferMemory,
																			 tcu::TextureFormat								imageFormat,
																			 deUint32										numTexelBuffers,
																			 deUint32										viewOffset);

	static std::vector<BufferViewHandleSp>			createBufferViews		(const vk::DeviceInterface&						vki,
																			 vk::VkDevice									device,
																			 const std::vector<BufferHandleSp>&				buffers,
																			 tcu::TextureFormat								imageFormat,
																			 deUint32										numTexelBuffers,
																			 deUint32										viewOffset);

	static std::vector<vk::VkBufferMemoryBarrier>	createBufferBarriers	(vk::VkDescriptorType							descriptorType,
																			 const std::vector<BufferHandleSp>&				buffers,
																			 deUint32										numTexelBuffers);


	static vk::Move<vk::VkBuffer>					createBuffer			(const vk::DeviceInterface&						vki,
																			 vk::VkDevice									device,
																			 vk::Allocator&									allocator,
																			 vk::VkDescriptorType							descriptorType,
																			 de::MovePtr<vk::Allocation>					*outAllocation);

	static vk::Move<vk::VkBufferView>				createBufferView		(const vk::DeviceInterface&						vki,
																			 vk::VkDevice									device,
																			 const tcu::TextureFormat&						textureFormat,
																			 deUint32										offset,
																			 vk::VkBuffer									buffer);

	static vk::VkBufferMemoryBarrier				createBarrier			(vk::VkDescriptorType							descriptorType,
																			 vk::VkBuffer									buffer);

	static void										populateSourceBuffer	(const tcu::PixelBufferAccess&					access,
																			 deUint32										bufferNdx);

	static void										uploadData				(const vk::DeviceInterface&						vki,
																			 vk::VkDevice									device,
																			 const vk::Allocation&							memory,
																			 const de::ArrayBuffer<deUint8>&				data);

	deUint32										getViewOffset			(vkt::Context&									context,
																			 bool											hasViewOffset,
																			 vk::VkDescriptorType							descriptorType);

public:
	static int								getFetchPos					(int fetchPosNdx);
	tcu::Vec4								fetchTexelValue				(int fetchPosNdx, int setNdx) const;

	inline int								getNumTexelBuffers			(void) const	{ return m_numTexelBuffers;	}
	const tcu::TextureFormat&				getTextureFormat			(void) const	{ return m_imageFormat;		}
	inline vk::VkBufferView					getBufferView				(int ndx) const { return **m_bufferView[ndx % m_bufferView.size()]; }
	inline tcu::ConstPixelBufferAccess		getSourceView				(int ndx) const { return m_sourceView[ndx % m_sourceView.size()];	}
	inline const vk::VkBufferMemoryBarrier*	getBufferInitBarriers		(void) const	{ return &m_bufferBarrier.front();	}

private:
	enum
	{
		BUFFER_SIZE			= 512,
		VIEW_DATA_SIZE		= 256,	//!< size in bytes
		VIEW_WIDTH			= 64,	//!< size in pixels
	};
	enum
	{
		// some arbitrary points
		SAMPLE_POINT_0 = 6,
		SAMPLE_POINT_1 = 51,
		SAMPLE_POINT_2 = 42,
		SAMPLE_POINT_3 = 25,
	};

	const deUint32									m_numTexelBuffers;
	const tcu::TextureFormat						m_imageFormat;
	const ShaderInputInterface						m_shaderInterface;
	const deUint32									m_viewOffset;

	const std::vector<de::ArrayBuffer<deUint8> >	m_sourceBuffer;
	const std::vector<tcu::ConstPixelBufferAccess>	m_sourceView;

	std::vector<AllocationSp>						m_bufferMemory;
	const std::vector<BufferHandleSp>				m_buffer;
	const std::vector<BufferViewHandleSp>			m_bufferView;
	const std::vector<vk::VkBufferMemoryBarrier>	m_bufferBarrier;
};

deUint32 TexelBufferInstanceBuffers::getViewOffset(vkt::Context&		context,
												   bool					hasViewOffset,
												   vk::VkDescriptorType	descriptorType)
{
	if (!hasViewOffset)
		return 0u;

	if (!context.getTexelBufferAlignmentFeaturesEXT().texelBufferAlignment)
		return (deUint32)context.getDeviceProperties().limits.minTexelBufferOffsetAlignment;

	vk::VkPhysicalDeviceTexelBufferAlignmentPropertiesEXT alignmentProperties;
	deMemset(&alignmentProperties, 0, sizeof(alignmentProperties));
	alignmentProperties.sType = vk::VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_TEXEL_BUFFER_ALIGNMENT_PROPERTIES_EXT;

	vk::VkPhysicalDeviceProperties2 properties2;
	deMemset(&properties2, 0, sizeof(properties2));
	properties2.sType = vk::VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROPERTIES_2;
	properties2.pNext = &alignmentProperties;

	context.getInstanceInterface().getPhysicalDeviceProperties2(context.getPhysicalDevice(), &properties2);

	vk::VkBool32 singleTexelAlignment = isUniformDescriptorType(descriptorType) ? alignmentProperties.uniformTexelBufferOffsetSingleTexelAlignment :
																				  alignmentProperties.storageTexelBufferOffsetSingleTexelAlignment;
	vk::VkDeviceSize align = isUniformDescriptorType(descriptorType) ? alignmentProperties.uniformTexelBufferOffsetAlignmentBytes :
																	   alignmentProperties.storageTexelBufferOffsetAlignmentBytes;

	// format is rgba8
	if (singleTexelAlignment)
        return de::min(4u, (deUint32)align);
	else
		return (deUint32)align;
}

TexelBufferInstanceBuffers::TexelBufferInstanceBuffers (vkt::Context&					context,
														const vk::DeviceInterface&		vki,
														vk::VkDevice					device,
														vk::Allocator&					allocator,
														vk::VkDescriptorType			descriptorType,
														DescriptorSetCount				descriptorSetCount,
														ShaderInputInterface			shaderInterface,
														bool							hasViewOffset)
	: m_numTexelBuffers	(getInterfaceNumResources(shaderInterface) * getDescriptorSetCount(descriptorSetCount))
	, m_imageFormat		(tcu::TextureFormat::RGBA, tcu::TextureFormat::UNORM_INT8)
	, m_shaderInterface (shaderInterface)
	, m_viewOffset		(getViewOffset(context, hasViewOffset, descriptorType))
	, m_sourceBuffer	(createSourceBuffers(m_imageFormat, m_numTexelBuffers))
	, m_sourceView		(createSourceViews(m_sourceBuffer, m_imageFormat, m_numTexelBuffers, m_viewOffset))
	, m_bufferMemory	()
	, m_buffer			(createBuffers(vki, device, allocator, descriptorType, m_sourceBuffer, m_bufferMemory, m_imageFormat, m_numTexelBuffers, m_viewOffset))
	, m_bufferView		(createBufferViews(vki, device, m_buffer, m_imageFormat, m_numTexelBuffers, m_viewOffset))
	, m_bufferBarrier	(createBufferBarriers(descriptorType, m_buffer, m_numTexelBuffers))
{
}

std::vector<de::ArrayBuffer<deUint8> > TexelBufferInstanceBuffers::createSourceBuffers (tcu::TextureFormat	imageFormat,
																						deUint32			numTexelBuffers)
{
	DE_ASSERT(BUFFER_SIZE % imageFormat.getPixelSize() == 0);

	std::vector<de::ArrayBuffer<deUint8> > sourceBuffers(numTexelBuffers, BUFFER_SIZE);

	for (deUint32 bufferNdx = 0; bufferNdx < numTexelBuffers; bufferNdx++)
		populateSourceBuffer(tcu::PixelBufferAccess(imageFormat, tcu::IVec3(BUFFER_SIZE / imageFormat.getPixelSize(), 1, 1), sourceBuffers[bufferNdx].getPtr()), bufferNdx);

	return sourceBuffers;
}

std::vector<tcu::ConstPixelBufferAccess> TexelBufferInstanceBuffers::createSourceViews (const std::vector<de::ArrayBuffer<deUint8> >&	sourceBuffers,
																						tcu::TextureFormat								imageFormat,
																						deUint32										numTexelBuffers,
																						deUint32										viewOffset)
{
	std::vector<tcu::ConstPixelBufferAccess> sourceViews;

	for (deUint32 bufferNdx = 0; bufferNdx < numTexelBuffers; bufferNdx++)
		sourceViews.push_back(tcu::ConstPixelBufferAccess(imageFormat, tcu::IVec3(VIEW_WIDTH, 1, 1), sourceBuffers[bufferNdx].getElementPtr(viewOffset)));

	return sourceViews;
}

std::vector<BufferHandleSp> TexelBufferInstanceBuffers::createBuffers (const vk::DeviceInterface&						vki,
																	   vk::VkDevice										device,
																	   vk::Allocator&									allocator,
																	   vk::VkDescriptorType								descriptorType,
																	   const std::vector<de::ArrayBuffer<deUint8> >&	sourceBuffers,
																	   std::vector<AllocationSp>&						bufferMemory,
																	   tcu::TextureFormat								imageFormat,
																	   deUint32											numTexelBuffers,
																	   deUint32											viewOffset)
{
	std::vector<BufferHandleSp> buffers;

	for (deUint32 bufferNdx = 0; bufferNdx < numTexelBuffers; bufferNdx++)
	{
		de::MovePtr<vk::Allocation>	memory;
		vk::Move<vk::VkBuffer>		buffer			= createBuffer(vki, device, allocator, descriptorType, &memory);
		vk::Move<vk::VkBufferView>	bufferView		= createBufferView(vki, device, imageFormat, viewOffset, *buffer);

		uploadData(vki, device, *memory, sourceBuffers[bufferNdx]);

		bufferMemory.push_back(AllocationSp(memory.release()));
		buffers.push_back(BufferHandleSp(new BufferHandleUp(buffer)));
	}

	return buffers;
}

std::vector<BufferViewHandleSp> TexelBufferInstanceBuffers::createBufferViews (const vk::DeviceInterface&			vki,
																			   vk::VkDevice							device,
																			   const std::vector<BufferHandleSp>&	buffers,
																			   tcu::TextureFormat					imageFormat,
																			   deUint32								numTexelBuffers,
																			   deUint32								viewOffset)
{
	std::vector<BufferViewHandleSp> bufferViews;

	for (deUint32 bufferNdx = 0; bufferNdx < numTexelBuffers; bufferNdx++)
	{
		vk::Move<vk::VkBufferView> bufferView = createBufferView(vki, device, imageFormat, viewOffset, **buffers[bufferNdx]);
		bufferViews.push_back(BufferViewHandleSp(new BufferViewHandleUp(bufferView)));
	}

	return bufferViews;
}

std::vector<vk::VkBufferMemoryBarrier> TexelBufferInstanceBuffers::createBufferBarriers (vk::VkDescriptorType				descriptorType,
																						 const std::vector<BufferHandleSp>&	buffers,
																						 deUint32							numTexelBuffers)
{
	std::vector<vk::VkBufferMemoryBarrier> bufferBarriers;

	for (deUint32 bufferNdx = 0; bufferNdx < numTexelBuffers; bufferNdx++)
		bufferBarriers.push_back(createBarrier(descriptorType, **buffers[bufferNdx]));

	return bufferBarriers;
}

vk::Move<vk::VkBuffer> TexelBufferInstanceBuffers::createBuffer (const vk::DeviceInterface&		vki,
																 vk::VkDevice					device,
																 vk::Allocator&					allocator,
																 vk::VkDescriptorType			descriptorType,
																 de::MovePtr<vk::Allocation>	*outAllocation)
{
	const vk::VkBufferUsageFlags	usage		= (isUniformDescriptorType(descriptorType)) ? (vk::VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT) : (vk::VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT);
	const vk::VkBufferCreateInfo	createInfo	=
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
		DE_NULL,
		0u,									// flags
		(vk::VkDeviceSize)BUFFER_SIZE,		// size
		usage,								// usage
		vk::VK_SHARING_MODE_EXCLUSIVE,		// sharingMode
		0u,									// queueFamilyCount
		DE_NULL,							// pQueueFamilyIndices
	};
	vk::Move<vk::VkBuffer>			buffer		(vk::createBuffer(vki, device, &createInfo));
	de::MovePtr<vk::Allocation>		allocation	(allocateAndBindObjectMemory(vki, device, allocator, *buffer, vk::MemoryRequirement::HostVisible));

	*outAllocation = allocation;
	return buffer;
}

vk::Move<vk::VkBufferView> TexelBufferInstanceBuffers::createBufferView (const vk::DeviceInterface&		vki,
																		 vk::VkDevice					device,
																		 const tcu::TextureFormat&		textureFormat,
																		 deUint32						offset,
																		 vk::VkBuffer					buffer)
{
	const vk::VkBufferViewCreateInfo createInfo =
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_VIEW_CREATE_INFO,
		DE_NULL,
		(vk::VkBufferViewCreateFlags)0,
		buffer,									// buffer
		vk::mapTextureFormat(textureFormat),	// format
		(vk::VkDeviceSize)offset,				// offset
		(vk::VkDeviceSize)VIEW_DATA_SIZE		// range
	};
	return vk::createBufferView(vki, device, &createInfo);
}

vk::VkBufferMemoryBarrier TexelBufferInstanceBuffers::createBarrier (vk::VkDescriptorType descriptorType, vk::VkBuffer buffer)
{
	const vk::VkAccessFlags			inputBit	= (isUniformDescriptorType(descriptorType)) ? (vk::VK_ACCESS_UNIFORM_READ_BIT) : (vk::VK_ACCESS_SHADER_READ_BIT);
	const vk::VkBufferMemoryBarrier	barrier		=
	{
		vk::VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER,
		DE_NULL,
		vk::VK_ACCESS_HOST_WRITE_BIT,			// srcAccessMask
		inputBit,								// dstAccessMask
		VK_QUEUE_FAMILY_IGNORED,				// srcQueueFamilyIndex
		VK_QUEUE_FAMILY_IGNORED,				// destQueueFamilyIndex
		buffer,									// buffer
		0u,										// offset
		(vk::VkDeviceSize)BUFFER_SIZE			// size
	};
	return barrier;
}

void TexelBufferInstanceBuffers::populateSourceBuffer (const tcu::PixelBufferAccess& access, deUint32 bufferNdx)
{
	DE_ASSERT(access.getHeight() == 1);
	DE_ASSERT(access.getDepth() == 1);

	const deInt32 width = access.getWidth();

	for (int x = 0; x < width; ++x)
	{
		int	red		= 255 * x / width;												//!< gradient from 0 -> max (detects large offset errors)
		int	green	= ((x % 2 == 0) ? (127) : (0)) + ((x % 4 < 3) ? (128) : (0));	//!< 3-level M pattern (detects small offset errors)
		int	blue	= 16 * (x % 16);												//!< 16-long triangle wave

		DE_ASSERT(de::inRange(red, 0, 255));
		DE_ASSERT(de::inRange(green, 0, 255));
		DE_ASSERT(de::inRange(blue, 0, 255));

		if (bufferNdx % 2 == 0) red		= 255 - red;
		if (bufferNdx % 3 == 0) green	= 255 - green;
		if (bufferNdx % 4 == 0) blue	= 255 - blue;

		access.setPixel(tcu::IVec4(red, green, blue, 255), x, 0, 0);
	}
}

void TexelBufferInstanceBuffers::uploadData (const vk::DeviceInterface& vki, vk::VkDevice device, const vk::Allocation& memory, const de::ArrayBuffer<deUint8>& data)
{
	deMemcpy(memory.getHostPtr(), data.getPtr(), data.size());
	flushAlloc(vki, device, memory);
}

int TexelBufferInstanceBuffers::getFetchPos (int fetchPosNdx)
{
	static const int fetchPositions[4] =
	{
		SAMPLE_POINT_0,
		SAMPLE_POINT_1,
		SAMPLE_POINT_2,
		SAMPLE_POINT_3,
	};
	return de::getSizedArrayElement<4>(fetchPositions, fetchPosNdx);
}

tcu::Vec4 TexelBufferInstanceBuffers::fetchTexelValue (int fetchPosNdx, int setNdx) const
{
	// source order is ABAB
	const tcu::ConstPixelBufferAccess&	texelSrcA	= getSourceView(setNdx * getInterfaceNumResources(m_shaderInterface));
	const tcu::ConstPixelBufferAccess&	texelSrcB	= getSourceView(setNdx * getInterfaceNumResources(m_shaderInterface) + 1);
	const tcu::ConstPixelBufferAccess&	texelSrc	= ((fetchPosNdx % 2) == 0) ? (texelSrcA) : (texelSrcB);

	return texelSrc.getPixel(getFetchPos(fetchPosNdx), 0, 0);
}

class TexelBufferRenderInstance : public SingleCmdRenderInstance
{
public:
													TexelBufferRenderInstance		(vkt::Context&									context,
																					 DescriptorUpdateMethod							updateMethod,
																					 bool											isPrimaryCmdBuf,
																					 vk::VkDescriptorType							descriptorType,
																					 DescriptorSetCount								descriptorSetCount,
																					 vk::VkShaderStageFlags							stageFlags,
																					 ShaderInputInterface							shaderInterface,
																					 bool											nonzeroViewOffset);

private:
	static std::vector<DescriptorSetLayoutHandleSp>	createDescriptorSetLayouts		(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 vk::VkShaderStageFlags								stageFlags,
																					 DescriptorUpdateMethod								updateMethod);

	static vk::Move<vk::VkPipelineLayout>			createPipelineLayout			(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayout);

	static vk::Move<vk::VkDescriptorPool>			createDescriptorPool			(const vk::DeviceInterface&							vki,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface);

	static std::vector<DescriptorSetHandleSp>		createDescriptorSets			(const vk::DeviceInterface&							vki,
																					 DescriptorUpdateMethod								updateMethod,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayouts,
																					 vk::VkDescriptorPool								pool,
																					 const TexelBufferInstanceBuffers&					buffers,
																					 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																					 std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																					 std::vector<RawUpdateRegistry>&					updateRegistry,
																					 std::vector<deUint32>&								descriptorsPerSet,
																					 vk::VkPipelineLayout								pipelineLayout = DE_NULL);

	static void										writeDescriptorSet				(const vk::DeviceInterface&						vki,
																					 vk::VkDevice									device,
																					 vk::VkDescriptorType							descriptorType,
																					 ShaderInputInterface							shaderInterface,
																					 vk::VkDescriptorSetLayout						layout,
																					 vk::VkDescriptorPool							pool,
																					 vk::VkBufferView								viewA,
																					 vk::VkBufferView								viewB,
																					 vk::VkDescriptorSet							descriptorSet,
																					 vk::DescriptorSetUpdateBuilder&				updateBuilder,
																					 std::vector<deUint32>&							descriptorsPerSet,
																					 DescriptorUpdateMethod							updateMethod = DESCRIPTOR_UPDATE_METHOD_NORMAL);

	static void										writeDescriptorSetWithTemplate	(const vk::DeviceInterface&						vki,
																					 vk::VkDevice									device,
																					 vk::VkDescriptorType							descriptorType,
																					 ShaderInputInterface							shaderInterface,
																					 vk::VkDescriptorSetLayout						layout,
																					 deUint32										setNdx,
																					 vk::VkDescriptorPool							pool,
																					 vk::VkBufferView								viewA,
																					 vk::VkBufferView								viewB,
																					 vk::VkDescriptorSet							descriptorSet,
																					 std::vector<UpdateTemplateHandleSp>&			updateTemplates,
																					 std::vector<RawUpdateRegistry>&				registry,
																					 bool											withPush = false,
																					 vk::VkPipelineLayout							pipelineLayout = 0);

	void											logTestPlan						(void) const;
	vk::VkPipelineLayout							getPipelineLayout				(void) const;
	void											writeDrawCmdBuffer				(vk::VkCommandBuffer cmd) const;
	tcu::TestStatus									verifyResultImage				(const tcu::ConstPixelBufferAccess& result) const;

	enum
	{
		RENDER_SIZE = 128,
	};

	const DescriptorUpdateMethod					m_updateMethod;
	const vk::VkDescriptorType						m_descriptorType;
	const DescriptorSetCount						m_descriptorSetCount;
	const vk::VkShaderStageFlags					m_stageFlags;
	const ShaderInputInterface						m_shaderInterface;
	const bool										m_nonzeroViewOffset;

	std::vector<UpdateTemplateHandleSp>				m_updateTemplates;
	std::vector<RawUpdateRegistry>					m_updateRegistry;
	vk::DescriptorSetUpdateBuilder					m_updateBuilder;
	const std::vector<DescriptorSetLayoutHandleSp>	m_descriptorSetLayouts;
	const vk::Move<vk::VkPipelineLayout>			m_pipelineLayout;
	const TexelBufferInstanceBuffers				m_texelBuffers;
	const vk::Unique<vk::VkDescriptorPool>			m_descriptorPool;
	std::vector<deUint32>							m_descriptorsPerSet;
	const std::vector<DescriptorSetHandleSp>		m_descriptorSets;
};

TexelBufferRenderInstance::TexelBufferRenderInstance (vkt::Context&					context,
													  DescriptorUpdateMethod		updateMethod,
													  bool							isPrimaryCmdBuf,
													  vk::VkDescriptorType			descriptorType,
													  DescriptorSetCount			descriptorSetCount,
													  vk::VkShaderStageFlags		stageFlags,
													  ShaderInputInterface			shaderInterface,
													  bool							nonzeroViewOffset)
	: SingleCmdRenderInstance	(context, isPrimaryCmdBuf, tcu::UVec2(RENDER_SIZE, RENDER_SIZE))
	, m_updateMethod			(updateMethod)
	, m_descriptorType			(descriptorType)
	, m_descriptorSetCount		(descriptorSetCount)
	, m_stageFlags				(stageFlags)
	, m_shaderInterface			(shaderInterface)
	, m_nonzeroViewOffset		(nonzeroViewOffset)
	, m_updateTemplates			()
	, m_updateRegistry			()
	, m_updateBuilder			()
	, m_descriptorSetLayouts	(createDescriptorSetLayouts(m_vki, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_stageFlags, m_updateMethod))
	, m_pipelineLayout			(createPipelineLayout(m_vki, m_device, m_descriptorSetLayouts))
	, m_texelBuffers			(context, m_vki, m_device, m_allocator, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_nonzeroViewOffset)
	, m_descriptorPool			(createDescriptorPool(m_vki, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface))
	, m_descriptorsPerSet		()
	, m_descriptorSets			(createDescriptorSets(m_vki, m_updateMethod, m_device, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_descriptorSetLayouts, *m_descriptorPool, m_texelBuffers, m_updateBuilder, m_updateTemplates, m_updateRegistry, m_descriptorsPerSet, *m_pipelineLayout))
{
}

std::vector<DescriptorSetLayoutHandleSp> TexelBufferRenderInstance::createDescriptorSetLayouts (const vk::DeviceInterface&	vki,
																								vk::VkDevice				device,
																								vk::VkDescriptorType		descriptorType,
																								DescriptorSetCount			descriptorSetCount,
																								ShaderInputInterface		shaderInterface,
																								vk::VkShaderStageFlags		stageFlags,
																								DescriptorUpdateMethod		updateMethod)
{
	std::vector<DescriptorSetLayoutHandleSp> descriptorSetLayouts;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		vk::DescriptorSetLayoutBuilder			builder;
		vk::VkDescriptorSetLayoutCreateFlags	extraFlags = 0;

		if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE ||
			updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
		{
			extraFlags |= vk::VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR;
		}

		switch (shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				builder.addSingleBinding(descriptorType, stageFlags);
				break;

			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				builder.addSingleBinding(descriptorType, stageFlags);
				builder.addSingleBinding(descriptorType, stageFlags);
				break;

			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				builder.addSingleIndexedBinding(descriptorType, stageFlags, 0);
				builder.addSingleIndexedBinding(descriptorType, stageFlags, 2);
				break;

			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				builder.addSingleIndexedBinding(descriptorType, stageFlags, getArbitraryBindingIndex(0));
				builder.addSingleIndexedBinding(descriptorType, stageFlags, getArbitraryBindingIndex(1));
				break;

			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				builder.addArrayBinding(descriptorType, 2u, stageFlags);
				break;

			default:
				DE_FATAL("Impossible");
		}

		vk::Move<vk::VkDescriptorSetLayout> layout = builder.build(vki, device, extraFlags);
		descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(layout)));

		// Add an empty descriptor set layout between sets 0 and 2
		if (setNdx == 0 && descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS)
		{
			vk::DescriptorSetLayoutBuilder		emptyBuilder;
			vk::Move<vk::VkDescriptorSetLayout>	emptyLayout = emptyBuilder.build(vki, device, (vk::VkDescriptorSetLayoutCreateFlags)0);
			descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(emptyLayout)));
		}
	}
	return descriptorSetLayouts;
}

vk::Move<vk::VkPipelineLayout> TexelBufferRenderInstance::createPipelineLayout (const vk::DeviceInterface&						vki,
																				vk::VkDevice									device,
																				const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayout)
{
	std::vector<vk::VkDescriptorSetLayout> layoutHandles;
	for (size_t setNdx = 0; setNdx < descriptorSetLayout.size(); setNdx++)
		layoutHandles.push_back(**descriptorSetLayout[setNdx]);

	const vk::VkPipelineLayoutCreateInfo createInfo =
	{
		vk::VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
		DE_NULL,
		(vk::VkPipelineLayoutCreateFlags)0,
		(deUint32)layoutHandles.size(),		// descriptorSetCount
		&layoutHandles.front(),				// pSetLayouts
		0u,									// pushConstantRangeCount
		DE_NULL,							// pPushConstantRanges
	};
	return vk::createPipelineLayout(vki, device, &createInfo);
}

vk::Move<vk::VkDescriptorPool> TexelBufferRenderInstance::createDescriptorPool (const vk::DeviceInterface&	vki,
																				vk::VkDevice					device,
																				vk::VkDescriptorType			descriptorType,
																				DescriptorSetCount				descriptorSetCount,
																				ShaderInputInterface			shaderInterface)
{
	return vk::DescriptorPoolBuilder()
		.addType(descriptorType, getDescriptorSetCount(descriptorSetCount) * getInterfaceNumResources(shaderInterface))
		.build(vki, device, vk::VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, getDescriptorSetCount(descriptorSetCount));
}

std::vector<DescriptorSetHandleSp> TexelBufferRenderInstance::createDescriptorSets (const vk::DeviceInterface&							vki,
																					 DescriptorUpdateMethod								updateMethod,
																					 vk::VkDevice										device,
																					 vk::VkDescriptorType								descriptorType,
																					 DescriptorSetCount									descriptorSetCount,
																					 ShaderInputInterface								shaderInterface,
																					 const std::vector<DescriptorSetLayoutHandleSp>&	descriptorSetLayouts,
																					 vk::VkDescriptorPool								pool,
																					 const TexelBufferInstanceBuffers&					buffers,
																					 vk::DescriptorSetUpdateBuilder&					updateBuilder,
																					 std::vector<UpdateTemplateHandleSp>&				updateTemplates,
																					 std::vector<RawUpdateRegistry>&					updateRegistry,
																					 std::vector<deUint32>&								descriptorsPerSet,
																					 vk::VkPipelineLayout								pipelineLayout)
{
	std::vector<DescriptorSetHandleSp> descriptorSets;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(descriptorSetCount); setNdx++)
	{
		vk::VkDescriptorSetLayout				layout = **descriptorSetLayouts[getDescriptorSetNdx(descriptorSetCount, setNdx)];

		const vk::VkDescriptorSetAllocateInfo	allocInfo	=
		{
			vk::VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
			DE_NULL,
			pool,
			1u,
			&layout
		};

		vk::VkBufferView						viewA		= buffers.getBufferView(setNdx * getInterfaceNumResources(shaderInterface));
		vk::VkBufferView						viewB		= buffers.getBufferView(setNdx * getInterfaceNumResources(shaderInterface) + 1);

		vk::Move<vk::VkDescriptorSet>			descriptorSet;

		if (updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH && updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			descriptorSet = allocateDescriptorSet(vki, device, &allocInfo);
		}
		else
		{
			descriptorSet = vk::Move<vk::VkDescriptorSet>();
		}

		if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE)
		{
			writeDescriptorSetWithTemplate(vki, device, descriptorType, shaderInterface, layout, setNdx, pool, viewA, viewB, *descriptorSet, updateTemplates, updateRegistry);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			writeDescriptorSetWithTemplate(vki, device, descriptorType, shaderInterface, layout, setNdx, pool, viewA, viewB, *descriptorSet, updateTemplates, updateRegistry, true, pipelineLayout);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
		{
			writeDescriptorSet(vki, device, descriptorType, shaderInterface, layout, pool, viewA, viewB, *descriptorSet, updateBuilder, descriptorsPerSet, updateMethod);
		}
		else if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
		{
			writeDescriptorSet(vki, device, descriptorType, shaderInterface, layout, pool, viewA, viewB, *descriptorSet, updateBuilder, descriptorsPerSet);
		}

		descriptorSets.push_back(DescriptorSetHandleSp(new DescriptorSetHandleUp(descriptorSet)));
	}

	return descriptorSets;
}

void TexelBufferRenderInstance::writeDescriptorSet (const vk::DeviceInterface&						vki,
													vk::VkDevice									device,
													vk::VkDescriptorType							descriptorType,
													ShaderInputInterface							shaderInterface,
													vk::VkDescriptorSetLayout						layout,
													vk::VkDescriptorPool							pool,
													vk::VkBufferView								viewA,
													vk::VkBufferView								viewB,
												    vk::VkDescriptorSet								descriptorSet,
												    vk::DescriptorSetUpdateBuilder&					updateBuilder,
													std::vector<deUint32>&							descriptorsPerSet,
												    DescriptorUpdateMethod							updateMethod)
{
	DE_UNREF(layout);
	DE_UNREF(pool);
	const vk::VkBufferView					texelBufferInfos[2]	=
	{
		viewA,
		viewB,
	};
	deUint32								numDescriptors		= 0u;

	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &texelBufferInfos[0]);
			numDescriptors++;
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &texelBufferInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(1u), descriptorType, &texelBufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, &texelBufferInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(2u), descriptorType, &texelBufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), descriptorType, &texelBufferInfos[0]);
			updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), descriptorType, &texelBufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(0u), descriptorType, 2u, texelBufferInfos);
			numDescriptors++;
			break;

		default:
			DE_FATAL("Impossible");
	}

	descriptorsPerSet.push_back(numDescriptors);

	if (updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		updateBuilder.update(vki, device);
		updateBuilder.clear();
	}
}

void TexelBufferRenderInstance::writeDescriptorSetWithTemplate (const vk::DeviceInterface&						vki,
																vk::VkDevice									device,
																vk::VkDescriptorType							descriptorType,
																ShaderInputInterface							shaderInterface,
																vk::VkDescriptorSetLayout						layout,
																deUint32										setNdx,
																vk::VkDescriptorPool							pool,
																vk::VkBufferView								viewA,
																vk::VkBufferView								viewB,
																vk::VkDescriptorSet								descriptorSet,
																std::vector<UpdateTemplateHandleSp>&			updateTemplates,
																std::vector<RawUpdateRegistry>&					registry,
																bool											withPush,
																vk::VkPipelineLayout							pipelineLayout)
{
	DE_UNREF(pool);
	const vk::VkBufferView									texelBufferInfos[2]	=
	{
		viewA,
		viewB,
	};
	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// updateCount
		DE_NULL,	// pUpdates
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_GRAPHICS,
		pipelineLayout,
		setNdx
	};

	RawUpdateRegistry										updateRegistry;

	updateRegistry.addWriteObject(texelBufferInfos[0]);
	updateRegistry.addWriteObject(texelBufferInfos[1]);

	switch (shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(1, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(0, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(2, 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(0), 0));
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, descriptorType, updateRegistry.getWriteObjectOffset(1), 0));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateEntries.push_back(createTemplateBinding(0, 0, 2, descriptorType, updateRegistry.getWriteObjectOffset(0), sizeof(texelBufferInfos[0])));
			break;

		default:
			DE_FATAL("Impossible");
	}

	templateCreateInfo.pDescriptorUpdateEntries		= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount	= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(vki, device, &templateCreateInfo);
	updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	registry.push_back(updateRegistry);

	if (!withPush)
	{
		vki.updateDescriptorSetWithTemplate(device, descriptorSet, **updateTemplates.back(), registry.back().getRawPointer());
	}
}

void TexelBufferRenderInstance::logTestPlan (void) const
{
	std::ostringstream msg;

	msg << "Rendering 2x2 grid.\n"
		<< ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
		<< "Each descriptor set contains "
		<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
		<< " descriptor(s) of type " << vk::getDescriptorTypeName(m_descriptorType) << "\n"
		<< "Buffer view is created with a " << ((m_nonzeroViewOffset) ? ("non-zero") : ("zero")) << " offset.\n"
		<< "Buffer format is " << vk::getFormatName(vk::mapTextureFormat(m_texelBuffers.getTextureFormat())) << ".\n";

	if (m_stageFlags == 0u)
	{
		msg << "Descriptors are not accessed in any shader stage.\n";
	}
	else
	{
		msg << "Color in each cell is fetched using the descriptor(s):\n";

		for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
		{
			msg << "Test sample " << resultNdx << ": fetch at position " << m_texelBuffers.getFetchPos(resultNdx);

			if (m_shaderInterface != SHADER_INPUT_SINGLE_DESCRIPTOR)
			{
				const int srcResourceNdx = (resultNdx % 2); // ABAB source
				msg << " from texelBuffer " << srcResourceNdx;
			}

			msg << "\n";
		}

		msg << "Descriptors are accessed in {"
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_VERTEX_BIT) != 0)					? (" vertex")			: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT) != 0)	? (" tess_control")		: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT) != 0)	? (" tess_evaluation")	: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_GEOMETRY_BIT) != 0)				? (" geometry")			: (""))
			<< (((m_stageFlags & vk::VK_SHADER_STAGE_FRAGMENT_BIT) != 0)				? (" fragment")			: (""))
			<< " } stages.";
	}

	m_context.getTestContext().getLog()
		<< tcu::TestLog::Message
		<< msg.str()
		<< tcu::TestLog::EndMessage;
}

vk::VkPipelineLayout TexelBufferRenderInstance::getPipelineLayout (void) const
{
	return *m_pipelineLayout;
}

void TexelBufferRenderInstance::writeDrawCmdBuffer (vk::VkCommandBuffer cmd) const
{
	if (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE && m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		std::vector<vk::VkDescriptorSet> sets;
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			sets.push_back(**m_descriptorSets[setNdx]);

		switch (m_descriptorSetCount)
		{
			case DESCRIPTOR_SET_COUNT_SINGLE:
			case DESCRIPTOR_SET_COUNT_MULTIPLE:
			{
				m_vki.cmdBindDescriptorSets(cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, getPipelineLayout(), 0, (deUint32)sets.size(), &sets.front(), 0, DE_NULL);
				break;
			}
			case DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS:
			{
				for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
				{
					const deUint32 descriptorSetNdx	= getDescriptorSetNdx(m_descriptorSetCount, setNdx);
					m_vki.cmdBindDescriptorSets(cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, getPipelineLayout(), descriptorSetNdx, 1, &sets[setNdx], 0, DE_NULL);
				}
				break;
			}
			default:
				DE_FATAL("Impossible");
		}
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
		{
			const deUint32 descriptorSetNdx = getDescriptorSetNdx(m_descriptorSetCount, setNdx);
			m_vki.cmdPushDescriptorSetWithTemplateKHR(cmd, **m_updateTemplates[setNdx], getPipelineLayout(), descriptorSetNdx, (const void*)m_updateRegistry[setNdx].getRawPointer());
		}
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		deUint32 descriptorNdx = 0u;
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
		{
			const deUint32	numDescriptors		= m_descriptorsPerSet[setNdx];
			const deUint32	descriptorSetNdx	= getDescriptorSetNdx(m_descriptorSetCount, setNdx);
			m_updateBuilder.updateWithPush(m_vki, cmd, vk::VK_PIPELINE_BIND_POINT_GRAPHICS, *m_pipelineLayout, descriptorSetNdx, descriptorNdx, numDescriptors);
			descriptorNdx += numDescriptors;
		}
	}

	m_vki.cmdDraw(cmd, 6 * 4, 1, 0, 0); // render four quads (two separate triangles)
}

tcu::TestStatus TexelBufferRenderInstance::verifyResultImage (const tcu::ConstPixelBufferAccess& result) const
{
	const deUint32		numDescriptorSets	= getDescriptorSetCount(m_descriptorSetCount);
	const tcu::Vec4		green				(0.0f, 1.0f, 0.0f, 1.0f);
	const tcu::Vec4		yellow				(1.0f, 1.0f, 0.0f, 1.0f);
	const bool			doFetch				= (m_stageFlags != 0u); // no active stages? Then don't fetch

	tcu::Surface		reference			(m_targetSize.x(), m_targetSize.y());

	tcu::Vec4			sample0				= tcu::Vec4(0.0f);
	tcu::Vec4			sample1				= tcu::Vec4(0.0f);
	tcu::Vec4			sample2				= tcu::Vec4(0.0f);
	tcu::Vec4			sample3				= tcu::Vec4(0.0f);

	if (doFetch)
	{
		for (deUint32 setNdx = 0u; setNdx < numDescriptorSets; setNdx++)
		{
			sample0	+= m_texelBuffers.fetchTexelValue(0, setNdx);
			sample1	+= m_texelBuffers.fetchTexelValue(1, setNdx);
			sample2	+= m_texelBuffers.fetchTexelValue(2, setNdx);
			sample3	+= m_texelBuffers.fetchTexelValue(3, setNdx);
		}

		if (numDescriptorSets > 1)
		{
			sample0 = sample0 / tcu::Vec4(float(numDescriptorSets));
			sample1 = sample1 / tcu::Vec4(float(numDescriptorSets));
			sample2 = sample2 / tcu::Vec4(float(numDescriptorSets));
			sample3 = sample3 / tcu::Vec4(float(numDescriptorSets));
		}
	}
	else
	{
		sample0 = yellow;
		sample1 = green;
		sample2 = green;
		sample3 = yellow;
	}

	drawQuadrantReferenceResult(reference.getAccess(), sample0, sample1, sample2, sample3);

	if (!bilinearCompare(m_context.getTestContext().getLog(), "Compare", "Result comparison", reference.getAccess(), result, tcu::RGBA(1, 1, 1, 1), tcu::COMPARE_LOG_RESULT))
		return tcu::TestStatus::fail("Image verification failed");
	else
		return tcu::TestStatus::pass("Pass");
}

class TexelBufferComputeInstance : public vkt::TestInstance
{
public:
													TexelBufferComputeInstance			(vkt::Context&					context,
																						 DescriptorUpdateMethod			updateMethod,
																						 vk::VkDescriptorType			descriptorType,
																						 DescriptorSetCount				descriptorSetCount,
																						 ShaderInputInterface			shaderInterface,
																						 bool							nonzeroViewOffset);

private:
	vk::Move<vk::VkDescriptorSetLayout>				createDescriptorSetLayout			(deUint32 setNdx) const;
	vk::Move<vk::VkDescriptorPool>					createDescriptorPool				(void) const;
	vk::Move<vk::VkDescriptorSet>					createDescriptorSet					(vk::VkDescriptorPool pool, vk::VkDescriptorSetLayout layout, deUint32 setNdx);
	void											writeDescriptorSet					(vk::VkDescriptorSet descriptorSet, deUint32 setNdx);
	void											writeDescriptorSetWithTemplate		(vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, bool withPush = false, vk::VkPipelineLayout pipelineLayout = DE_NULL);

	tcu::TestStatus									iterate								(void);
	void											logTestPlan							(void) const;
	tcu::TestStatus									testResourceAccess					(void);

	const DescriptorUpdateMethod					m_updateMethod;
	const vk::VkDescriptorType						m_descriptorType;
	const DescriptorSetCount						m_descriptorSetCount;
	const ShaderInputInterface						m_shaderInterface;
	const bool										m_nonzeroViewOffset;

	const vk::DeviceInterface&						m_vki;
	const vk::VkDevice								m_device;
	const vk::VkQueue								m_queue;
	const deUint32									m_queueFamilyIndex;
	vk::Allocator&									m_allocator;
	std::vector<UpdateTemplateHandleSp>				m_updateTemplates;

	const ComputeInstanceResultBuffer				m_result;
	const TexelBufferInstanceBuffers				m_texelBuffers;

	std::vector<RawUpdateRegistry>					m_updateRegistry;
	vk::DescriptorSetUpdateBuilder					m_updateBuilder;
	std::vector<deUint32>							m_descriptorsPerSet;
};

TexelBufferComputeInstance::TexelBufferComputeInstance (Context&					context,
														DescriptorUpdateMethod		updateMethod,
														vk::VkDescriptorType		descriptorType,
														DescriptorSetCount			descriptorSetCount,
														ShaderInputInterface		shaderInterface,
														bool						nonzeroViewOffset)
	: vkt::TestInstance		(context)
	, m_updateMethod		(updateMethod)
	, m_descriptorType		(descriptorType)
	, m_descriptorSetCount	(descriptorSetCount)
	, m_shaderInterface		(shaderInterface)
	, m_nonzeroViewOffset	(nonzeroViewOffset)
	, m_vki					(context.getDeviceInterface())
	, m_device				(context.getDevice())
	, m_queue				(context.getUniversalQueue())
	, m_queueFamilyIndex	(context.getUniversalQueueFamilyIndex())
	, m_allocator			(context.getDefaultAllocator())
	, m_updateTemplates		()
	, m_result				(m_vki, m_device, m_allocator)
	, m_texelBuffers		(context, m_vki, m_device, m_allocator, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_nonzeroViewOffset)
	, m_updateRegistry		()
	, m_updateBuilder		()
	, m_descriptorsPerSet	()
{
}

vk::Move<vk::VkDescriptorSetLayout> TexelBufferComputeInstance::createDescriptorSetLayout (deUint32 setNdx) const
{
	vk::DescriptorSetLayoutBuilder			builder;
	vk::VkDescriptorSetLayoutCreateFlags	extraFlags	= 0;
	deUint32								binding		= 0;

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE ||
			m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		extraFlags |= vk::VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR;
	}

	if (setNdx == 0)
		builder.addSingleIndexedBinding(vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding++);

	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			builder.addSingleBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding);
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, binding + 2);
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, getArbitraryBindingIndex(0));
			builder.addSingleIndexedBinding(m_descriptorType, vk::VK_SHADER_STAGE_COMPUTE_BIT, getArbitraryBindingIndex(1));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			builder.addArrayBinding(m_descriptorType, 2u, vk::VK_SHADER_STAGE_COMPUTE_BIT);
			break;

		default:
			DE_FATAL("Impossible");
	};

	return builder.build(m_vki, m_device, extraFlags);
}

vk::Move<vk::VkDescriptorPool> TexelBufferComputeInstance::createDescriptorPool (void) const
{
	return vk::DescriptorPoolBuilder()
		.addType(vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER)
		.addType(m_descriptorType, getDescriptorSetCount(m_descriptorSetCount) * getInterfaceNumResources(m_shaderInterface))
		.build(m_vki, m_device, vk::VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT, getDescriptorSetCount(m_descriptorSetCount));
}

vk::Move<vk::VkDescriptorSet> TexelBufferComputeInstance::createDescriptorSet (vk::VkDescriptorPool pool, vk::VkDescriptorSetLayout layout, deUint32 setNdx)
{
	const vk::VkDescriptorSetAllocateInfo	allocInfo			=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
		DE_NULL,
		pool,
		1u,
		&layout
	};

	vk::Move<vk::VkDescriptorSet>			descriptorSet;
	if (m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH && m_updateMethod != DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		descriptorSet = allocateDescriptorSet(m_vki, m_device, &allocInfo);
	}
	else
	{
		descriptorSet = vk::Move<vk::VkDescriptorSet>();
	}


	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE)
	{
		writeDescriptorSetWithTemplate(*descriptorSet, layout, setNdx);
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		writeDescriptorSet(*descriptorSet, setNdx);
	}

	return descriptorSet;
}

void TexelBufferComputeInstance::writeDescriptorSet (vk::VkDescriptorSet descriptorSet, deUint32 setNdx)
{
	const vk::VkDescriptorBufferInfo		resultInfo			= vk::makeDescriptorBufferInfo(m_result.getBuffer(), 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkBufferView					texelBufferInfos[2]	=
	{
		m_texelBuffers.getBufferView(setNdx * getInterfaceNumResources(m_shaderInterface)),
		m_texelBuffers.getBufferView(setNdx * getInterfaceNumResources(m_shaderInterface) + 1)
	};
	deUint32								binding				= 0u;
	deUint32								numDescriptors		= 0u;

	// result
	if (setNdx == 0)
	{
		m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, &resultInfo);
		numDescriptors++;
	}

	// texel buffers
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &texelBufferInfos[0]);
			numDescriptors++;
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &texelBufferInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, &texelBufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding), m_descriptorType, &texelBufferInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding + 2), m_descriptorType, &texelBufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(0)), m_descriptorType, &texelBufferInfos[0]);
			m_updateBuilder.writeSingle(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(getArbitraryBindingIndex(1)), m_descriptorType, &texelBufferInfos[1]);
			numDescriptors += 2;
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			m_updateBuilder.writeArray(descriptorSet, vk::DescriptorSetUpdateBuilder::Location::binding(binding++), m_descriptorType, 2u, texelBufferInfos);
			numDescriptors++;
			break;

		default:
			DE_FATAL("Impossible");
	}

	m_descriptorsPerSet.push_back(numDescriptors);

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_NORMAL)
	{
		m_updateBuilder.update(m_vki, m_device);
		m_updateBuilder.clear();
	}
}

void TexelBufferComputeInstance::writeDescriptorSetWithTemplate (vk::VkDescriptorSet descriptorSet, vk::VkDescriptorSetLayout layout, deUint32 setNdx, bool withPush, vk::VkPipelineLayout pipelineLayout)
{
	const vk::VkDescriptorBufferInfo						resultInfo			= vk::makeDescriptorBufferInfo(m_result.getBuffer(), 0u, (vk::VkDeviceSize)ComputeInstanceResultBuffer::DATA_SIZE);
	const vk::VkBufferView									texelBufferInfos[2]	=
	{
		m_texelBuffers.getBufferView(setNdx * getInterfaceNumResources(m_shaderInterface)),
		m_texelBuffers.getBufferView(setNdx * getInterfaceNumResources(m_shaderInterface) + 1)
	};
	std::vector<vk::VkDescriptorUpdateTemplateEntry>		updateEntries;
	vk::VkDescriptorUpdateTemplateCreateInfo				templateCreateInfo	=
	{
		vk::VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO_KHR,
		DE_NULL,
		0,
		0,			// updateCount
		DE_NULL,	// pUpdates
		withPush ? vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR : vk::VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET,
		layout,
		vk::VK_PIPELINE_BIND_POINT_COMPUTE,
		pipelineLayout,
		setNdx
	};
	deUint32												binding				= 0u;
	deUint32												offset				= 0u;
	RawUpdateRegistry										updateRegistry;

	if (setNdx == 0)
		updateRegistry.addWriteObject(resultInfo);

	updateRegistry.addWriteObject(texelBufferInfos[0]);
	updateRegistry.addWriteObject(texelBufferInfos[1]);

	// result
	if (setNdx == 0)
		updateEntries.push_back(createTemplateBinding(binding++, 0, 1, vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, updateRegistry.getWriteObjectOffset(offset++), 0));

	// texel buffers
	switch (m_shaderInterface)
	{
		case SHADER_INPUT_SINGLE_DESCRIPTOR:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(binding++, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(binding, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(binding + 2, 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(0), 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			updateEntries.push_back(createTemplateBinding(getArbitraryBindingIndex(1), 0, 1, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), 0));
			break;

		case SHADER_INPUT_DESCRIPTOR_ARRAY:
			updateEntries.push_back(createTemplateBinding(binding++, 0, 2, m_descriptorType, updateRegistry.getWriteObjectOffset(offset++), sizeof(texelBufferInfos[0])));
			break;

		default:
			DE_FATAL("Impossible");
	}

	templateCreateInfo.pDescriptorUpdateEntries		= &updateEntries[0];
	templateCreateInfo.descriptorUpdateEntryCount	= (deUint32)updateEntries.size();

	vk::Move<vk::VkDescriptorUpdateTemplate>				updateTemplate		= vk::createDescriptorUpdateTemplate(m_vki, m_device, &templateCreateInfo);
	m_updateTemplates.push_back(UpdateTemplateHandleSp(new UpdateTemplateHandleUp(updateTemplate)));
	m_updateRegistry.push_back(updateRegistry);

	if (!withPush)
	{
		m_vki.updateDescriptorSetWithTemplate(m_device, descriptorSet, **m_updateTemplates[setNdx], m_updateRegistry.back().getRawPointer());
	}
}

tcu::TestStatus TexelBufferComputeInstance::iterate (void)
{
	logTestPlan();
	return testResourceAccess();
}

void TexelBufferComputeInstance::logTestPlan (void) const
{
	std::ostringstream msg;

	msg << "Fetching 4 values from image in compute shader.\n"
		<< ((m_descriptorSetCount == DESCRIPTOR_SET_COUNT_SINGLE) ? "Single descriptor set. " : "Multiple descriptor sets. ")
		<< "Each descriptor set contains "
		<< ((m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR) ? "single" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) ? "two" :
			    (m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY) ? "an array (size 2) of" :
			    (const char*)DE_NULL)
		<< " descriptor(s) of type " << vk::getDescriptorTypeName(m_descriptorType) << "\n"
		<< "Buffer view is created with a " << ((m_nonzeroViewOffset) ? ("non-zero") : ("zero")) << " offset.\n"
		<< "Buffer format is " << vk::getFormatName(vk::mapTextureFormat(m_texelBuffers.getTextureFormat())) << ".\n";

	for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
	{
		msg << "Test sample " << resultNdx << ": fetch at position " << m_texelBuffers.getFetchPos(resultNdx);

		if (m_shaderInterface != SHADER_INPUT_SINGLE_DESCRIPTOR)
		{
			const int srcResourceNdx = (resultNdx % 2); // ABAB source
			msg << " from texelBuffer " << srcResourceNdx;
		}

		msg << "\n";
	}

	m_context.getTestContext().getLog()
		<< tcu::TestLog::Message
		<< msg.str()
		<< tcu::TestLog::EndMessage;
}

tcu::TestStatus TexelBufferComputeInstance::testResourceAccess (void)
{
	const vk::Unique<vk::VkDescriptorPool>			descriptorPool(createDescriptorPool());
	std::vector<DescriptorSetLayoutHandleSp>		descriptorSetLayouts;
	std::vector<DescriptorSetHandleSp>				descriptorSets;
	std::vector<vk::VkDescriptorSetLayout>			layoutHandles;
	std::vector<vk::VkDescriptorSet>				setHandles;

	for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
	{
		vk::Move<vk::VkDescriptorSetLayout>	layout	= createDescriptorSetLayout(setNdx);
		vk::Move<vk::VkDescriptorSet>		set		= createDescriptorSet(*descriptorPool, *layout, setNdx);

		descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(layout)));
		descriptorSets.push_back(DescriptorSetHandleSp(new DescriptorSetHandleUp(set)));

		layoutHandles.push_back(**descriptorSetLayouts.back());
		setHandles.push_back(**descriptorSets.back());

		// Add an empty descriptor set layout between sets 0 and 2
		if (setNdx == 0 && m_descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS)
		{
			vk::DescriptorSetLayoutBuilder		emptyBuilder;
			vk::Move<vk::VkDescriptorSetLayout>	emptyLayout = emptyBuilder.build(m_vki, m_device, (vk::VkDescriptorSetLayoutCreateFlags)0);

			descriptorSetLayouts.push_back(DescriptorSetLayoutHandleSp(new DescriptorSetLayoutHandleUp(emptyLayout)));
			layoutHandles.push_back(**descriptorSetLayouts.back());
		}
	}

	const ComputePipeline							pipeline			(m_vki, m_device, m_context.getBinaryCollection(), (int)layoutHandles.size(), &layoutHandles.front());
	const deUint32* const							dynamicOffsets		= DE_NULL;
	const int										numDynamicOffsets	= 0;
	const vk::VkBufferMemoryBarrier* const			preBarriers			= m_texelBuffers.getBufferInitBarriers();
	const int										numPreBarriers		= m_texelBuffers.getNumTexelBuffers();
	const vk::VkBufferMemoryBarrier* const			postBarriers		= m_result.getResultReadBarrier();
	const int										numPostBarriers		= 1;

	const ComputeCommand							compute				(m_vki,
																		 m_device,
																		 pipeline.getPipeline(),
																		 pipeline.getPipelineLayout(),
																		 tcu::UVec3(4, 1, 1),
																		 m_shaderInterface,
																		 m_descriptorSetCount,	&setHandles.front(),
																		 numDynamicOffsets,		dynamicOffsets,
																		 numPreBarriers,		preBarriers,
																		 numPostBarriers,		postBarriers);

	tcu::Vec4										results[4];
	bool											anyResultSet		= false;
	bool											allResultsOk		= true;

	if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			writeDescriptorSetWithTemplate(DE_NULL, layoutHandles[setNdx], setNdx, true, pipeline.getPipelineLayout());

		compute.submitAndWait(m_queueFamilyIndex, m_queue, &m_updateTemplates, &m_updateRegistry);
	}
	else if (m_updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH)
	{
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			writeDescriptorSet(DE_NULL, setNdx);

		compute.submitAndWait(m_queueFamilyIndex, m_queue, m_updateBuilder, m_descriptorsPerSet);
	}
	else
	{
		compute.submitAndWait(m_queueFamilyIndex, m_queue);
	}
	m_result.readResultContentsTo(&results);

	// verify
	for (int resultNdx = 0; resultNdx < 4; ++resultNdx)
	{
		const tcu::Vec4	result				= results[resultNdx];
		const tcu::Vec4	conversionThreshold	= tcu::Vec4(1.0f / 255.0f);

		tcu::Vec4		reference			= tcu::Vec4(0.0f);
		for (deUint32 setNdx = 0; setNdx < getDescriptorSetCount(m_descriptorSetCount); setNdx++)
			reference += m_texelBuffers.fetchTexelValue(resultNdx, setNdx);

		reference = reference / tcu::Vec4((float)getDescriptorSetCount(m_descriptorSetCount));

		if (result != tcu::Vec4(-1.0f))
			anyResultSet = true;

		if (tcu::boolAny(tcu::greaterThan(tcu::abs(result - reference), conversionThreshold)))
		{
			allResultsOk = false;

			m_context.getTestContext().getLog()
				<< tcu::TestLog::Message
				<< "Test sample " << resultNdx << ": Expected " << reference << ", got " << result
				<< tcu::TestLog::EndMessage;
		}
	}

	// read back and verify
	if (allResultsOk)
		return tcu::TestStatus::pass("Pass");
	else if (anyResultSet)
		return tcu::TestStatus::fail("Invalid result values");
	else
	{
		m_context.getTestContext().getLog()
			<< tcu::TestLog::Message
			<< "Result buffer was not written to."
			<< tcu::TestLog::EndMessage;
		return tcu::TestStatus::fail("Result buffer was not written to");
	}
}

class TexelBufferDescriptorCase : public QuadrantRendederCase
{
public:
	enum
	{
		FLAG_VIEW_OFFSET = (1u << 1u),
	};
	// enum continues where resource flags ends
	DE_STATIC_ASSERT((deUint32)FLAG_VIEW_OFFSET == (deUint32)RESOURCE_FLAG_LAST);

								TexelBufferDescriptorCase	(tcu::TestContext&		testCtx,
															 DescriptorUpdateMethod	updateMethod,
															 const char*			name,
															 const char*			description,
															 bool					isPrimaryCmdBuf,
															 vk::VkDescriptorType	descriptorType,
															 vk::VkShaderStageFlags	exitingStages,
															 vk::VkShaderStageFlags	activeStages,
															 DescriptorSetCount		descriptorSetCount,
															 ShaderInputInterface	shaderInterface,
															 deUint32				flags);

private:
	std::string					genExtensionDeclarations	(vk::VkShaderStageFlagBits stage) const;
	std::string					genResourceDeclarations		(vk::VkShaderStageFlagBits stage, int numUsedBindings) const;
	std::string					genResourceAccessSource		(vk::VkShaderStageFlagBits stage) const;
	std::string					genNoAccessSource			(void) const;

	vkt::TestInstance*			createInstance				(vkt::Context& context) const;

	const DescriptorUpdateMethod	m_updateMethod;
	const bool						m_isPrimaryCmdBuf;
	const vk::VkDescriptorType		m_descriptorType;
	const DescriptorSetCount		m_descriptorSetCount;
	const ShaderInputInterface		m_shaderInterface;
	const bool						m_nonzeroViewOffset;
};

TexelBufferDescriptorCase::TexelBufferDescriptorCase (tcu::TestContext&			testCtx,
													  DescriptorUpdateMethod	updateMethod,
													  const char*				name,
													  const char*				description,
													  bool						isPrimaryCmdBuf,
													  vk::VkDescriptorType		descriptorType,
													  vk::VkShaderStageFlags	exitingStages,
													  vk::VkShaderStageFlags	activeStages,
													  DescriptorSetCount		descriptorSetCount,
													  ShaderInputInterface		shaderInterface,
													  deUint32					flags)
	: QuadrantRendederCase	(testCtx, name, description, glu::GLSL_VERSION_310_ES, exitingStages, activeStages, descriptorSetCount)
	, m_updateMethod		(updateMethod)
	, m_isPrimaryCmdBuf		(isPrimaryCmdBuf)
	, m_descriptorType		(descriptorType)
	, m_descriptorSetCount	(descriptorSetCount)
	, m_shaderInterface		(shaderInterface)
	, m_nonzeroViewOffset	(((flags & FLAG_VIEW_OFFSET) != 0) ? (1u) : (0u))
{
}

std::string TexelBufferDescriptorCase::genExtensionDeclarations (vk::VkShaderStageFlagBits stage) const
{
	DE_UNREF(stage);
	return "#extension GL_EXT_texture_buffer : require\n";
}

std::string TexelBufferDescriptorCase::genResourceDeclarations (vk::VkShaderStageFlagBits stage, int numUsedBindings) const
{
	DE_UNREF(stage);

	const bool			isUniform		= isUniformDescriptorType(m_descriptorType);
	const char* const	storageType		= (isUniform) ? ("textureBuffer ") : ("readonly imageBuffer ");
	const char* const	formatQualifier	= (isUniform) ? ("") : (", rgba8");
	const deUint32		numSets			= getDescriptorSetCount(m_descriptorSetCount);

	std::ostringstream	buf;

	for (deUint32 setNdx = 0; setNdx < numSets; setNdx++)
	{
		// Result buffer is bound only to the first descriptor set in compute shader cases
		const int			descBinding		= numUsedBindings - ((m_activeStages & vk::VK_SHADER_STAGE_COMPUTE_BIT) ? (setNdx == 0 ? 0 : 1) : 0);
		const std::string	setNdxPostfix	= (numSets == 1) ? "" : de::toString(setNdx);
		const deUint32		descriptorSet	= getDescriptorSetNdx(m_descriptorSetCount, setNdx);

		switch (m_shaderInterface)
		{
			case SHADER_INPUT_SINGLE_DESCRIPTOR:
				buf <<	"layout(set = " << descriptorSet << ", binding = " + de::toString(descBinding) + formatQualifier + ") uniform highp " + storageType + "u_texelBuffer" << setNdxPostfix << ";\n";
				break;
			case SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS:
				buf <<	"layout(set = " << descriptorSet << ", binding = " + de::toString(descBinding) + formatQualifier + ") uniform highp " + storageType + "u_texelBuffer" << setNdxPostfix << "A;\n"
						"layout(set = " << descriptorSet << ", binding = " + de::toString(descBinding + 1) + formatQualifier + ") uniform highp " + storageType + "u_texelBuffer" << setNdxPostfix << "B;\n";
				break;
			case SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS:
				buf <<	"layout(set = " << descriptorSet << ", binding = " + de::toString(descBinding) + formatQualifier + ") uniform highp " + storageType + "u_texelBuffer" << setNdxPostfix << "A;\n"
						"layout(set = " << descriptorSet << ", binding = " + de::toString(descBinding + 2) + formatQualifier + ") uniform highp " + storageType + "u_texelBuffer" << setNdxPostfix << "B;\n";
				break;
			case SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS:
				buf <<	"layout(set = " << descriptorSet << ", binding = " + de::toString(getArbitraryBindingIndex(0)) + formatQualifier + ") uniform highp " + storageType + "u_texelBuffer" << setNdxPostfix << "A;\n"
						"layout(set = " << descriptorSet << ", binding = " + de::toString(getArbitraryBindingIndex(1)) + formatQualifier + ") uniform highp " + storageType + "u_texelBuffer" << setNdxPostfix << "B;\n";
				break;
			case SHADER_INPUT_DESCRIPTOR_ARRAY:
				buf <<	"layout(set = " << descriptorSet << ", binding = " + de::toString(descBinding) + formatQualifier + ") uniform highp " + storageType + "u_texelBuffer" << setNdxPostfix << "[2];\n";
				break;
			default:
				DE_FATAL("Impossible");
				return "";
		}
	}
	return buf.str();
}

std::string TexelBufferDescriptorCase::genResourceAccessSource (vk::VkShaderStageFlagBits stage) const
{
	DE_UNREF(stage);

	const char* const	accessPostfixA	= (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR)						? ("")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS)		? ("A")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS)	? ("A")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS)		? ("A")
										: (m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY)						? ("[0]")
										: (DE_NULL);
	const char* const	accessPostfixB	= (m_shaderInterface == SHADER_INPUT_SINGLE_DESCRIPTOR)						? ("")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS)		? ("B")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS)	? ("B")
										: (m_shaderInterface == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS)		? ("B")
										: (m_shaderInterface == SHADER_INPUT_DESCRIPTOR_ARRAY)						? ("[1]")
										: (DE_NULL);
	const char* const	fetchFunc		= (isUniformDescriptorType(m_descriptorType)) ? ("texelFetch") : ("imageLoad");
	const deUint32		numSets			= getDescriptorSetCount(m_descriptorSetCount);

	std::ostringstream	buf;

	buf << "	result_color = vec4(0.0);\n";

	for (deUint32 setNdx = 0; setNdx < numSets; setNdx++)
	{
		const std::string	setNdxPostfix = (numSets == 1) ? "" : de::toString(setNdx);

		buf << "	if (quadrant_id == 0)\n"
			<< "		result_color += " << fetchFunc << "(u_texelBuffer" << setNdxPostfix << accessPostfixA << ", " << TexelBufferInstanceBuffers::getFetchPos(0) << ");\n"
			<< "	else if (quadrant_id == 1)\n"
			<< "		result_color += " << fetchFunc << "(u_texelBuffer" << setNdxPostfix << accessPostfixB << ", " << TexelBufferInstanceBuffers::getFetchPos(1) << ");\n"
			<< "	else if (quadrant_id == 2)\n"
			<< "		result_color += " << fetchFunc << "(u_texelBuffer" << setNdxPostfix << accessPostfixA << ", " << TexelBufferInstanceBuffers::getFetchPos(2) << ");\n"
			<< "	else\n"
			<< "		result_color += " << fetchFunc << "(u_texelBuffer" << setNdxPostfix << accessPostfixB << ", " << TexelBufferInstanceBuffers::getFetchPos(3) << ");\n";
	}

	if (getDescriptorSetCount(m_descriptorSetCount) > 1)
		buf << "	result_color /= vec4(" << getDescriptorSetCount(m_descriptorSetCount) << ".0);\n";

	return buf.str();
}

std::string TexelBufferDescriptorCase::genNoAccessSource (void) const
{
	return "	if (quadrant_id == 1 || quadrant_id == 2)\n"
			"		result_color = vec4(0.0, 1.0, 0.0, 1.0);\n"
			"	else\n"
			"		result_color = vec4(1.0, 1.0, 0.0, 1.0);\n";
}

vkt::TestInstance* TexelBufferDescriptorCase::createInstance (vkt::Context& context) const
{
	verifyDriverSupport(context.getUsedApiVersion(), context.getDeviceFeatures(), context.getDeviceExtensions(), m_updateMethod, m_descriptorType, m_activeStages);

	if (m_exitingStages == vk::VK_SHADER_STAGE_COMPUTE_BIT)
	{
		DE_ASSERT(m_isPrimaryCmdBuf); // secondaries are only valid within renderpass
		return new TexelBufferComputeInstance(context, m_updateMethod, m_descriptorType, m_descriptorSetCount, m_shaderInterface, m_nonzeroViewOffset);
	}
	else
		return new TexelBufferRenderInstance(context, m_updateMethod, m_isPrimaryCmdBuf, m_descriptorType, m_descriptorSetCount, m_activeStages, m_shaderInterface, m_nonzeroViewOffset);
}

void createShaderAccessImageTests (tcu::TestCaseGroup*		group,
								   bool						isPrimaryCmdBuf,
								   DescriptorUpdateMethod	updateMethod,
								   vk::VkDescriptorType		descriptorType,
								   vk::VkShaderStageFlags	exitingStages,
								   vk::VkShaderStageFlags	activeStages,
								   DescriptorSetCount		descriptorSetCount,
								   ShaderInputInterface		dimension,
								   deUint32					resourceFlags)
{
	static const struct
	{
		vk::VkImageViewType	viewType;
		const char*			name;
		const char*			description;
		deUint32			flags;
	} s_imageTypes[] =
	{
		{ vk::VK_IMAGE_VIEW_TYPE_1D,			"1d",						"1D image view",								0u										},
		{ vk::VK_IMAGE_VIEW_TYPE_1D,			"1d_base_mip",				"1D image subview with base mip level",			ImageDescriptorCase::FLAG_BASE_MIP		},
		{ vk::VK_IMAGE_VIEW_TYPE_1D,			"1d_base_slice",			"1D image subview with base array slice",		ImageDescriptorCase::FLAG_BASE_SLICE	},

		{ vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY,		"1d_array",					"1D array image view",							0u										},
		{ vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY,		"1d_array_base_mip",		"1D array image subview with base mip level",	ImageDescriptorCase::FLAG_BASE_MIP		},
		{ vk::VK_IMAGE_VIEW_TYPE_1D_ARRAY,		"1d_array_base_slice",		"1D array image subview with base array slice",	ImageDescriptorCase::FLAG_BASE_SLICE	},

		{ vk::VK_IMAGE_VIEW_TYPE_2D,			"2d",						"2D image view",								0u										},
		{ vk::VK_IMAGE_VIEW_TYPE_2D,			"2d_base_mip",				"2D image subview with base mip level",			ImageDescriptorCase::FLAG_BASE_MIP		},
		{ vk::VK_IMAGE_VIEW_TYPE_2D,			"2d_base_slice",			"2D image subview with base array slice",		ImageDescriptorCase::FLAG_BASE_SLICE	},

		{ vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY,		"2d_array",					"2D array image view",							0u										},
		{ vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY,		"2d_array_base_mip",		"2D array image subview with base mip level",	ImageDescriptorCase::FLAG_BASE_MIP		},
		{ vk::VK_IMAGE_VIEW_TYPE_2D_ARRAY,		"2d_array_base_slice",		"2D array image subview with base array slice",	ImageDescriptorCase::FLAG_BASE_SLICE	},

		{ vk::VK_IMAGE_VIEW_TYPE_3D,			"3d",						"3D image view",								0u										},
		{ vk::VK_IMAGE_VIEW_TYPE_3D,			"3d_base_mip",				"3D image subview with base mip level",			ImageDescriptorCase::FLAG_BASE_MIP		},
		// no 3d array textures

		{ vk::VK_IMAGE_VIEW_TYPE_CUBE,			"cube",						"Cube image view",								0u										},
		{ vk::VK_IMAGE_VIEW_TYPE_CUBE,			"cube_base_mip",			"Cube image subview with base mip level",		ImageDescriptorCase::FLAG_BASE_MIP		},
		{ vk::VK_IMAGE_VIEW_TYPE_CUBE,			"cube_base_slice",			"Cube image subview with base array slice",		ImageDescriptorCase::FLAG_BASE_SLICE	},

		{ vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY,	"cube_array",				"Cube image view",								0u										},
		{ vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY,	"cube_array_base_mip",		"Cube image subview with base mip level",		ImageDescriptorCase::FLAG_BASE_MIP		},
		{ vk::VK_IMAGE_VIEW_TYPE_CUBE_ARRAY,	"cube_array_base_slice",	"Cube image subview with base array slice",		ImageDescriptorCase::FLAG_BASE_SLICE	}
	};

	for (int ndx = 0; ndx < DE_LENGTH_OF_ARRAY(s_imageTypes); ++ndx)
	{
		// never overlap
		DE_ASSERT((s_imageTypes[ndx].flags & resourceFlags) == 0u);

		// skip some image view variations to avoid unnecessary bloating
		if ((descriptorType != vk::VK_DESCRIPTOR_TYPE_SAMPLER) && (dimension == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) && (s_imageTypes[ndx].viewType != vk::VK_IMAGE_VIEW_TYPE_2D))
			continue;

		if ((dimension == SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS) && (activeStages & vk::VK_SHADER_STAGE_COMPUTE_BIT) && (s_imageTypes[ndx].viewType != vk::VK_IMAGE_VIEW_TYPE_2D))
			continue;

		if ((dimension == SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS) && (s_imageTypes[ndx].viewType != vk::VK_IMAGE_VIEW_TYPE_2D))
			continue;

		if ((descriptorSetCount == DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS) && (s_imageTypes[ndx].viewType != vk::VK_IMAGE_VIEW_TYPE_2D))
			continue;

		group->addChild(new ImageDescriptorCase(group->getTestContext(),
												s_imageTypes[ndx].name,
												s_imageTypes[ndx].description,
												isPrimaryCmdBuf,
												updateMethod,
												descriptorType,
												exitingStages,
												activeStages,
												descriptorSetCount,
												dimension,
												s_imageTypes[ndx].viewType,
												s_imageTypes[ndx].flags | resourceFlags));
	}
}

void createShaderAccessTexelBufferTests (tcu::TestCaseGroup*	group,
										 bool					isPrimaryCmdBuf,
										 DescriptorUpdateMethod	updateMethod,
										 vk::VkDescriptorType	descriptorType,
										 vk::VkShaderStageFlags	exitingStages,
										 vk::VkShaderStageFlags	activeStages,
										 DescriptorSetCount		descriptorSetCount,
										 ShaderInputInterface	dimension,
										 deUint32				resourceFlags)
{
	DE_ASSERT(resourceFlags == 0);
	DE_UNREF(resourceFlags);

	static const struct
	{
		const char*	name;
		const char*	description;
		deUint32	flags;
	} s_texelBufferTypes[] =
	{
		{ "offset_zero",		"View offset is zero",		0u											},
		{ "offset_nonzero",		"View offset is non-zero",	TexelBufferDescriptorCase::FLAG_VIEW_OFFSET	},
	};

	for (int ndx = 0; ndx < DE_LENGTH_OF_ARRAY(s_texelBufferTypes); ++ndx)
	{
		group->addChild(new TexelBufferDescriptorCase(group->getTestContext(),
													  updateMethod,
													  s_texelBufferTypes[ndx].name,
													  s_texelBufferTypes[ndx].description,
													  isPrimaryCmdBuf,
													  descriptorType,
													  exitingStages,
													  activeStages,
													  descriptorSetCount,
													  dimension,
													  s_texelBufferTypes[ndx].flags));
	}
}

void createShaderAccessBufferTests (tcu::TestCaseGroup*		group,
									bool					isPrimaryCmdBuf,
									DescriptorUpdateMethod	updateMethod,
									vk::VkDescriptorType	descriptorType,
									vk::VkShaderStageFlags	exitingStages,
									vk::VkShaderStageFlags	activeStages,
									DescriptorSetCount		descriptorSetCount,
									ShaderInputInterface	dimension,
									deUint32				resourceFlags)
{
	DE_ASSERT(resourceFlags == 0u);
	DE_UNREF(resourceFlags);

	static const struct
	{
		const char*	name;
		const char*	description;
		bool		isForDynamicCases;
		deUint32	flags;
	} s_bufferTypes[] =
	{
		{ "offset_view_zero",						"View offset is zero",									false,	0u																							},
		{ "offset_view_nonzero",					"View offset is non-zero",								false,	BufferDescriptorCase::FLAG_VIEW_OFFSET														},

		{ "offset_view_zero_dynamic_zero",			"View offset is zero, dynamic offset is zero",			true,	BufferDescriptorCase::FLAG_DYNAMIC_OFFSET_ZERO												},
		{ "offset_view_zero_dynamic_nonzero",		"View offset is zero, dynamic offset is non-zero",		true,	BufferDescriptorCase::FLAG_DYNAMIC_OFFSET_NONZERO											},
		{ "offset_view_nonzero_dynamic_zero",		"View offset is non-zero, dynamic offset is zero",		true,	BufferDescriptorCase::FLAG_VIEW_OFFSET | BufferDescriptorCase::FLAG_DYNAMIC_OFFSET_ZERO		},
		{ "offset_view_nonzero_dynamic_nonzero",	"View offset is non-zero, dynamic offset is non-zero",	true,	BufferDescriptorCase::FLAG_VIEW_OFFSET | BufferDescriptorCase::FLAG_DYNAMIC_OFFSET_NONZERO	},
	};

	const bool isDynamicCase = isDynamicDescriptorType(descriptorType);

	if (isDynamicCase)
	{
		if (updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH || updateMethod == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
		{
			// Can't support push descriptor sets with dynamic UBOs or SSBOs
			return;
		}
	}

	for (int ndx = 0; ndx < DE_LENGTH_OF_ARRAY(s_bufferTypes); ++ndx)
	{
		if (isDynamicCase == s_bufferTypes[ndx].isForDynamicCases)
			group->addChild(new BufferDescriptorCase(group->getTestContext(),
													 updateMethod,
													 s_bufferTypes[ndx].name,
													 s_bufferTypes[ndx].description,
													 isPrimaryCmdBuf,
													 descriptorType,
													 exitingStages,
													 activeStages,
													 descriptorSetCount,
													 dimension,
													 s_bufferTypes[ndx].flags));
	}
}

} // anonymous

tcu::TestCaseGroup* createShaderAccessTests (tcu::TestContext& testCtx)
{
	static const struct
	{
		const bool	isPrimary;
		const char*	name;
		const char*	description;
	} s_bindTypes[] =
	{
		{ true,		"primary_cmd_buf",		"Bind in primary command buffer"	},
		{ false,	"secondary_cmd_buf",	"Bind in secondary command buffer"	},
	};
	static const struct
	{
		const DescriptorUpdateMethod	method;
		const char*						name;
		const char*						description;
	} s_updateMethods[] =
	{
		{  DESCRIPTOR_UPDATE_METHOD_NORMAL,				"",						"Use regular descriptor updates" },
		{  DESCRIPTOR_UPDATE_METHOD_WITH_TEMPLATE,		"with_template",		"Use descriptor update templates" },
		{  DESCRIPTOR_UPDATE_METHOD_WITH_PUSH,			"with_push",			"Use push descriptor updates" },
		{  DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE, "with_push_template",	"Use push descriptor update templates" },
	};
	static const struct
	{
		const vk::VkDescriptorType	descriptorType;
		const char*					name;
		const char*					description;
		deUint32					flags;
	} s_descriptorTypes[] =
	{
		{ vk::VK_DESCRIPTOR_TYPE_SAMPLER,					"sampler_mutable",					"VK_DESCRIPTOR_TYPE_SAMPLER with mutable sampler",					0u								},
		{ vk::VK_DESCRIPTOR_TYPE_SAMPLER,					"sampler_immutable",				"VK_DESCRIPTOR_TYPE_SAMPLER with immutable sampler",				RESOURCE_FLAG_IMMUTABLE_SAMPLER	},
		{ vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,	"combined_image_sampler_mutable",	"VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER with mutable sampler",	0u								},
		{ vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,	"combined_image_sampler_immutable",	"VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER with immutable sampler",	RESOURCE_FLAG_IMMUTABLE_SAMPLER	},
		// \note No way to access SAMPLED_IMAGE without a sampler
		//{ vk::VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE,				"sampled_image",					"VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE",									0u								},
		{ vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,				"storage_image",					"VK_DESCRIPTOR_TYPE_STORAGE_IMAGE",									0u								},
		{ vk::VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER,		"uniform_texel_buffer",				"VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER",							0u								},
		{ vk::VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER,		"storage_texel_buffer",				"VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER",							0u								},
		{ vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,			"uniform_buffer",					"VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER",								0u								},
		{ vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER,			"storage_buffer",					"VK_DESCRIPTOR_TYPE_STORAGE_BUFFER",								0u								},
		{ vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC,	"uniform_buffer_dynamic",			"VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC",						0u								},
		{ vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC,	"storage_buffer_dynamic",			"VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC",						0u								},
	};
	static const struct
	{
		const char*				name;
		const char*				description;
		vk::VkShaderStageFlags	existingStages;				//!< stages that exists
		vk::VkShaderStageFlags	activeStages;				//!< stages that access resource
		bool					supportsSecondaryCmdBufs;
	} s_shaderStages[] =
	{
		{
			"no_access",
			"No accessing stages",
			vk::VK_SHADER_STAGE_VERTEX_BIT | vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			0u,
			true,
		},
		{
			"vertex",
			"Vertex stage",
			vk::VK_SHADER_STAGE_VERTEX_BIT | vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			vk::VK_SHADER_STAGE_VERTEX_BIT,
			true,
		},
		{
			"tess_ctrl",
			"Tessellation control stage",
			vk::VK_SHADER_STAGE_VERTEX_BIT | vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT | vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT | vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT,
			true,
		},
		{
			"tess_eval",
			"Tessellation evaluation stage",
			vk::VK_SHADER_STAGE_VERTEX_BIT | vk::VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT | vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT | vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			vk::VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT,
			true,
		},
		{
			"geometry",
			"Geometry stage",
			vk::VK_SHADER_STAGE_VERTEX_BIT | vk::VK_SHADER_STAGE_GEOMETRY_BIT | vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			vk::VK_SHADER_STAGE_GEOMETRY_BIT,
			true,
		},
		{
			"fragment",
			"Fragment stage",
			vk::VK_SHADER_STAGE_VERTEX_BIT | vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			true,
		},
		{
			"compute",
			"Compute stage",
			vk::VK_SHADER_STAGE_COMPUTE_BIT,
			vk::VK_SHADER_STAGE_COMPUTE_BIT,
			false,
		},
		{
			"vertex_fragment",
			"Vertex and fragment stages",
			vk::VK_SHADER_STAGE_VERTEX_BIT | vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			vk::VK_SHADER_STAGE_VERTEX_BIT | vk::VK_SHADER_STAGE_FRAGMENT_BIT,
			true,
		}
	};
	static const struct
	{
		ShaderInputInterface	dimension;
		const char*				name;
		const char*				description;
	} s_variableDimensions[] =
	{
		{ SHADER_INPUT_SINGLE_DESCRIPTOR,					"single_descriptor",					"Single descriptor"		},
		{ SHADER_INPUT_MULTIPLE_CONTIGUOUS_DESCRIPTORS,		"multiple_contiguous_descriptors",		"Multiple descriptors"	},
		{ SHADER_INPUT_MULTIPLE_DISCONTIGUOUS_DESCRIPTORS,	"multiple_discontiguous_descriptors",	"Multiple descriptors"	},
		{ SHADER_INPUT_MULTIPLE_ARBITRARY_DESCRIPTORS,		"multiple_arbitrary_descriptors",		"Multiple descriptors"	},
		{ SHADER_INPUT_DESCRIPTOR_ARRAY,					"descriptor_array",						"Descriptor array"		},
	};

	de::MovePtr<tcu::TestCaseGroup> group(new tcu::TestCaseGroup(testCtx, "shader_access", "Access resource via descriptor in a single descriptor set"));

	// .primary_cmd_buf...
	for (int bindTypeNdx = 0; bindTypeNdx < DE_LENGTH_OF_ARRAY(s_bindTypes); ++bindTypeNdx)
	{
		de::MovePtr<tcu::TestCaseGroup> bindGroup(new tcu::TestCaseGroup(testCtx, s_bindTypes[bindTypeNdx].name, s_bindTypes[bindTypeNdx].description));

		for (int updateMethodNdx = 0; updateMethodNdx < DE_LENGTH_OF_ARRAY(s_updateMethods); ++updateMethodNdx)
		{
			de::MovePtr<tcu::TestCaseGroup> updateMethodGroup(new tcu::TestCaseGroup(testCtx, s_updateMethods[updateMethodNdx].name, s_updateMethods[updateMethodNdx].description));

			// .sampler, .combined_image_sampler, other resource types ...
			for (int descriptorNdx = 0; descriptorNdx < DE_LENGTH_OF_ARRAY(s_descriptorTypes); ++descriptorNdx)
			{
				de::MovePtr<tcu::TestCaseGroup> typeGroup(new tcu::TestCaseGroup(testCtx, s_descriptorTypes[descriptorNdx].name, s_descriptorTypes[descriptorNdx].description));

				for (int stageNdx = 0; stageNdx < DE_LENGTH_OF_ARRAY(s_shaderStages); ++stageNdx)
				{
					if (s_bindTypes[bindTypeNdx].isPrimary || s_shaderStages[stageNdx].supportsSecondaryCmdBufs)
					{
						de::MovePtr<tcu::TestCaseGroup>	stageGroup					(new tcu::TestCaseGroup(testCtx, s_shaderStages[stageNdx].name, s_shaderStages[stageNdx].description));
						de::MovePtr<tcu::TestCaseGroup>	multipleGroup				(new tcu::TestCaseGroup(testCtx, "multiple_descriptor_sets", "Multiple descriptor sets"));
						de::MovePtr<tcu::TestCaseGroup>	multipleDiscontiguousGroup	(new tcu::TestCaseGroup(testCtx, "multiple_discontiguous_descriptor_sets", "Multiple discontiguous descriptor sets"));

						for (int dimensionNdx = 0; dimensionNdx < DE_LENGTH_OF_ARRAY(s_variableDimensions); ++dimensionNdx)
						{
							de::MovePtr<tcu::TestCaseGroup>	dimensionSingleDescriptorSetGroup					(new tcu::TestCaseGroup(testCtx, s_variableDimensions[dimensionNdx].name, s_variableDimensions[dimensionNdx].description));
							de::MovePtr<tcu::TestCaseGroup>	dimensionMultipleDescriptorSetsGroup				(new tcu::TestCaseGroup(testCtx, s_variableDimensions[dimensionNdx].name, s_variableDimensions[dimensionNdx].description));
							de::MovePtr<tcu::TestCaseGroup>	dimensionMultipleDiscontiguousDescriptorSetsGroup	(new tcu::TestCaseGroup(testCtx, s_variableDimensions[dimensionNdx].name, s_variableDimensions[dimensionNdx].description));
							void							(*createTestsFunc)(tcu::TestCaseGroup*		group,
																			   bool						isPrimaryCmdBuf,
																			   DescriptorUpdateMethod	updateMethod,
																			   vk::VkDescriptorType		descriptorType,
																			   vk::VkShaderStageFlags	existingStages,
																			   vk::VkShaderStageFlags	activeStages,
																			   DescriptorSetCount		descriptorSetCount,
																			   ShaderInputInterface		dimension,
																			   deUint32					resourceFlags);

							switch (s_descriptorTypes[descriptorNdx].descriptorType)
							{
								case vk::VK_DESCRIPTOR_TYPE_SAMPLER:
								case vk::VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
								case vk::VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
									createTestsFunc = createShaderAccessImageTests;
									break;

								case vk::VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER:
								case vk::VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER:
									createTestsFunc = createShaderAccessTexelBufferTests;
									break;

								case vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER:
								case vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER:
								case vk::VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC:
								case vk::VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC:
									createTestsFunc = createShaderAccessBufferTests;
									break;

								default:
									createTestsFunc = DE_NULL;
									DE_FATAL("Impossible");
							}

							if (createTestsFunc)
							{
								createTestsFunc(dimensionSingleDescriptorSetGroup.get(),
										s_bindTypes[bindTypeNdx].isPrimary,
										s_updateMethods[updateMethodNdx].method,
										s_descriptorTypes[descriptorNdx].descriptorType,
										s_shaderStages[stageNdx].existingStages,
										s_shaderStages[stageNdx].activeStages,
										DESCRIPTOR_SET_COUNT_SINGLE,
										s_variableDimensions[dimensionNdx].dimension,
										s_descriptorTypes[descriptorNdx].flags);

								createTestsFunc(dimensionMultipleDescriptorSetsGroup.get(),
										s_bindTypes[bindTypeNdx].isPrimary,
										s_updateMethods[updateMethodNdx].method,
										s_descriptorTypes[descriptorNdx].descriptorType,
										s_shaderStages[stageNdx].existingStages,
										s_shaderStages[stageNdx].activeStages,
										DESCRIPTOR_SET_COUNT_MULTIPLE,
										s_variableDimensions[dimensionNdx].dimension,
										s_descriptorTypes[descriptorNdx].flags);

								createTestsFunc(dimensionMultipleDiscontiguousDescriptorSetsGroup.get(),
										s_bindTypes[bindTypeNdx].isPrimary,
										s_updateMethods[updateMethodNdx].method,
										s_descriptorTypes[descriptorNdx].descriptorType,
										s_shaderStages[stageNdx].existingStages,
										s_shaderStages[stageNdx].activeStages,
										DESCRIPTOR_SET_COUNT_MULTIPLE_DISCONTIGUOUS,
										s_variableDimensions[dimensionNdx].dimension,
										s_descriptorTypes[descriptorNdx].flags);
							}
							else
								DE_FATAL("Impossible");

							stageGroup->addChild(dimensionSingleDescriptorSetGroup.release());

							// Only one descriptor set layout can be created with VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR set
							if (s_updateMethods[updateMethodNdx].method == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH || s_updateMethods[updateMethodNdx].method == DESCRIPTOR_UPDATE_METHOD_WITH_PUSH_TEMPLATE)
								continue;

							multipleGroup->addChild(dimensionMultipleDescriptorSetsGroup.release());
							multipleDiscontiguousGroup->addChild(dimensionMultipleDiscontiguousDescriptorSetsGroup.release());
						}

						stageGroup->addChild(multipleGroup.release());
						stageGroup->addChild(multipleDiscontiguousGroup.release());
						typeGroup->addChild(stageGroup.release());
					}
				}

				if (s_updateMethods[updateMethodNdx].method != DESCRIPTOR_UPDATE_METHOD_NORMAL)
				{
					updateMethodGroup->addChild(typeGroup.release());
				}
				else
				{
					bindGroup->addChild(typeGroup.release());
				}
			}

			if (s_updateMethods[updateMethodNdx].method != DESCRIPTOR_UPDATE_METHOD_NORMAL)
			{
				bindGroup->addChild(updateMethodGroup.release());
			}
		}

		group->addChild(bindGroup.release());
	}

	return group.release();
}

} // BindingModel
} // vkt