external/vulkancts/modules/vulkan/texture/vktTextureCompressedFormatTests.cpp

/*-------------------------------------------------------------------------
 * Vulkan Conformance Tests
 * ------------------------
 *
 * Copyright (c) 2016 The Khronos Group Inc.
 * Copyright (c) 2016 Samsung Electronics Co., Ltd.
 * Copyright (c) 2014 The Android Open Source Project
 *
 * 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 Compressed texture tests.
 *//*--------------------------------------------------------------------*/

#include "vktTextureCompressedFormatTests.hpp"

#include "deString.h"
#include "deStringUtil.hpp"
#include "tcuCompressedTexture.hpp"
#include "tcuImageCompare.hpp"
#include "tcuTexture.hpp"
#include "tcuTextureUtil.hpp"
#include "tcuVectorUtil.hpp"
#include "tcuAstcUtil.hpp"
#include "vkImageUtil.hpp"
#include "vktTestGroupUtil.hpp"
#include "vktTextureTestUtil.hpp"
#include <string>
#include <vector>

namespace vkt
{
namespace texture
{
namespace
{

using namespace vk;
using namespace glu::TextureTestUtil;
using namespace texture::util;

using std::string;
using std::vector;
using tcu::Sampler;
using tcu::TestLog;

// Compressed formats
static const struct {
	const VkFormat	format;
} formats[] =
{
	{ VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK		},
	{ VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK		},
	{ VK_FORMAT_ETC2_R8G8B8A1_UNORM_BLOCK	},
	{ VK_FORMAT_ETC2_R8G8B8A1_SRGB_BLOCK	},
	{ VK_FORMAT_ETC2_R8G8B8A8_UNORM_BLOCK	},
	{ VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK	},

	{ VK_FORMAT_EAC_R11_UNORM_BLOCK			},
	{ VK_FORMAT_EAC_R11_SNORM_BLOCK			},
	{ VK_FORMAT_EAC_R11G11_UNORM_BLOCK		},
	{ VK_FORMAT_EAC_R11G11_SNORM_BLOCK		},

	{ VK_FORMAT_ASTC_4x4_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_4x4_SRGB_BLOCK			},
	{ VK_FORMAT_ASTC_5x4_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_5x4_SRGB_BLOCK			},
	{ VK_FORMAT_ASTC_5x5_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_5x5_SRGB_BLOCK			},
	{ VK_FORMAT_ASTC_6x5_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_6x5_SRGB_BLOCK			},
	{ VK_FORMAT_ASTC_6x6_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_6x6_SRGB_BLOCK			},
	{ VK_FORMAT_ASTC_8x5_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_8x5_SRGB_BLOCK			},
	{ VK_FORMAT_ASTC_8x6_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_8x6_SRGB_BLOCK			},
	{ VK_FORMAT_ASTC_8x8_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_8x8_SRGB_BLOCK			},
	{ VK_FORMAT_ASTC_10x5_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_10x5_SRGB_BLOCK		},
	{ VK_FORMAT_ASTC_10x6_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_10x6_SRGB_BLOCK		},
	{ VK_FORMAT_ASTC_10x8_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_10x8_SRGB_BLOCK		},
	{ VK_FORMAT_ASTC_10x10_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_10x10_SRGB_BLOCK		},
	{ VK_FORMAT_ASTC_12x10_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_12x10_SRGB_BLOCK		},
	{ VK_FORMAT_ASTC_12x12_UNORM_BLOCK		},
	{ VK_FORMAT_ASTC_12x12_SRGB_BLOCK		},

	{ VK_FORMAT_BC1_RGB_UNORM_BLOCK			},
	{ VK_FORMAT_BC1_RGB_SRGB_BLOCK			},
	{ VK_FORMAT_BC1_RGBA_UNORM_BLOCK		},
	{ VK_FORMAT_BC1_RGBA_SRGB_BLOCK			},
	{ VK_FORMAT_BC2_UNORM_BLOCK				},
	{ VK_FORMAT_BC2_SRGB_BLOCK				},
	{ VK_FORMAT_BC3_UNORM_BLOCK				},
	{ VK_FORMAT_BC3_SRGB_BLOCK				},
	{ VK_FORMAT_BC4_UNORM_BLOCK				},
	{ VK_FORMAT_BC4_SNORM_BLOCK				},
	{ VK_FORMAT_BC5_UNORM_BLOCK				},
	{ VK_FORMAT_BC5_SNORM_BLOCK				},
	{ VK_FORMAT_BC6H_UFLOAT_BLOCK			},
	{ VK_FORMAT_BC6H_SFLOAT_BLOCK			},
	{ VK_FORMAT_BC7_UNORM_BLOCK				},
	{ VK_FORMAT_BC7_SRGB_BLOCK				}
};

static const struct {
	const int	width;
	const int	height;
	const int	depth;		// 2D test ignore depth value
	const bool	mipmaps;
	const char*	name;
} sizes[] =
{
	{ 128, 64, 8,  false, "pot"  },
	{ 51,  65, 17, false, "npot" },
	{ 51,  65, 17, true,  "npot_mip1" },
};

static const struct {
	const char*								name;
	const TextureBinding::ImageBackingMode	backingMode;
} backingModes[] =
{
	{ "",			TextureBinding::IMAGE_BACKING_MODE_REGULAR	},
#ifndef CTS_USES_VULKANSC
	{ "_sparse",	TextureBinding::IMAGE_BACKING_MODE_SPARSE	}
#endif // CTS_USES_VULKANSC
};

struct Compressed3DTestParameters : public Texture3DTestCaseParameters
{
										Compressed3DTestParameters	(void);
	TextureBinding::ImageBackingMode	backingMode;
};

Compressed3DTestParameters::Compressed3DTestParameters (void)
	: backingMode(TextureBinding::IMAGE_BACKING_MODE_REGULAR)
{
}

struct Compressed2DTestParameters : public Texture2DTestCaseParameters
{
										Compressed2DTestParameters	(void);
	TextureBinding::ImageBackingMode	backingMode;
};

Compressed2DTestParameters::Compressed2DTestParameters (void)
	: backingMode(TextureBinding::IMAGE_BACKING_MODE_REGULAR)
{
}

class Compressed2DTestInstance : public TestInstance
{
public:
	typedef Compressed2DTestParameters	ParameterType;

										Compressed2DTestInstance	(Context&				context,
																	 const ParameterType&	testParameters);
	tcu::TestStatus						iterate						(void);

private:
										Compressed2DTestInstance	(const Compressed2DTestInstance& other);
	Compressed2DTestInstance&			operator=					(const Compressed2DTestInstance& other);

	const ParameterType&				m_testParameters;
	const tcu::CompressedTexFormat		m_compressedFormat;
	TestTexture2DSp						m_texture;
	TextureRenderer						m_renderer;
};

Compressed2DTestInstance::Compressed2DTestInstance (Context&				context,
													const ParameterType&	testParameters)
	: TestInstance			(context)
	, m_testParameters		(testParameters)
	, m_compressedFormat	(mapVkCompressedFormat(testParameters.format))
	, m_texture				(TestTexture2DSp(new pipeline::TestTexture2D(m_compressedFormat, testParameters.width, testParameters.height)))
	, m_renderer			(context, testParameters.sampleCount, testParameters.width, testParameters.height)
{
	m_renderer.add2DTexture(m_texture, testParameters.aspectMask, testParameters.backingMode);
}

static void computeScaleAndBias (const tcu::ConstPixelBufferAccess& reference, const tcu::ConstPixelBufferAccess& result, tcu::Vec4& scale, tcu::Vec4& bias)
{
	tcu::Vec4 minVal;
	tcu::Vec4 maxVal;
	const float eps = 0.0001f;

	{
		tcu::Vec4 refMin;
		tcu::Vec4 refMax;
		estimatePixelValueRange(reference, refMin, refMax);

		minVal	= refMin;
		maxVal	= refMax;
	}

	{
		tcu::Vec4 resMin;
		tcu::Vec4 resMax;

		estimatePixelValueRange(result, resMin, resMax);

		minVal[0] = de::min(minVal[0], resMin[0]);
		minVal[1] = de::min(minVal[1], resMin[1]);
		minVal[2] = de::min(minVal[2], resMin[2]);
		minVal[3] = de::min(minVal[3], resMin[3]);

		maxVal[0] = de::max(maxVal[0], resMax[0]);
		maxVal[1] = de::max(maxVal[1], resMax[1]);
		maxVal[2] = de::max(maxVal[2], resMax[2]);
		maxVal[3] = de::max(maxVal[3], resMax[3]);
	}

	for (int c = 0; c < 4; c++)
	{
		if (maxVal[c] - minVal[c] < eps)
		{
			scale[c]	= (maxVal[c] < eps) ? 1.0f : (1.0f / maxVal[c]);
			bias[c]		= (c == 3) ? (1.0f - maxVal[c]*scale[c]) : (0.0f - minVal[c]*scale[c]);
		}
		else
		{
			scale[c]	= 1.0f / (maxVal[c] - minVal[c]);
			bias[c]		= 0.0f - minVal[c]*scale[c];
		}
	}
}

static inline tcu::UVec4 min (tcu::UVec4 a, tcu::UVec4 b)
{
	return tcu::UVec4(	deMin32(a[0], b[0]),
						deMin32(a[1], b[1]),
						deMin32(a[2], b[2]),
						deMin32(a[3], b[3]));
}

static bool compareColor (tcu::RGBA reference, tcu::RGBA result, tcu::RGBA threshold, tcu::UVec4& diff)
{
	const tcu::IVec4 refPix			= reference.toIVec();
	const tcu::IVec4 cmpPix			= result.toIVec();
	const tcu::UVec4 thresholdVec	= threshold.toIVec().cast<deUint32>();
	diff							= abs(refPix - cmpPix).cast<deUint32>();

	return boolAll(lessThanEqual(diff, thresholdVec));
}

template <typename TextureType>
static bool validateTexture (tcu::TestLog& log, const tcu::Surface& rendered, const TextureType& texture, const vector<float> &texCoord, deUint32 mipLevel,
		const tcu::PixelFormat &pixelFormat, const tcu::RGBA& colorThreshold, float coordThreshold, const ReferenceParams sampleParams)
{
	const deUint32			textureWidth		= texture.getWidth() >> mipLevel;
	const deUint32			textureHeight		= texture.getHeight() >> mipLevel;
	const deUint32			renderWidth			= rendered.getWidth();
	const deUint32			renderHeight		= rendered.getHeight();

	tcu::TextureLevel		errorMaskStorage	(tcu::TextureFormat(tcu::TextureFormat::RGB, tcu::TextureFormat::UNORM_INT8), renderWidth, renderHeight, 1);
	tcu::PixelBufferAccess	errorMask			= errorMaskStorage.getAccess();

	tcu::UVec4				maxDiff				(0u, 0u, 0u, 0u);
	tcu::UVec4				smpDiff				(0u, 0u, 0u, 0u);
	tcu::UVec4				diff				(0u, 0u, 0u, 0u);
	bool					isOk				= true;

	// Compute reference.
	tcu::Surface referenceFrame	(textureWidth, textureHeight);
	glu::TextureTestUtil::sampleTexture(tcu::SurfaceAccess(referenceFrame, pixelFormat), texture, &texCoord[0], sampleParams);

	for (deUint32 x = 0; x < renderWidth; ++x)
	{
		for (deUint32 y = 0; y < renderHeight; ++y)
		{
			bool			matchFound		= false;
			const tcu::RGBA rendered_color	= rendered.getPixel(x, y);

			const float	fragX			= ((float)x + 0.5f) / (float)renderWidth;
			const float	fragY			= ((float)y + 0.5f) / (float)renderHeight;
			const float	samplePixX		= fragX * (float)(textureWidth);
			const float	samplePixY		= fragY * (float)(textureHeight);

			const deUint32	sampleXMin		= (int)(samplePixX - coordThreshold);
			const deUint32	sampleXMax		= (int)(samplePixX + coordThreshold);
			const deUint32	sampleYMin		= (int)(samplePixY - coordThreshold);
			const deUint32	sampleYMax		= (int)(samplePixY + coordThreshold);

			// Compare color within given sample coordinates tolerance and return from included loops when match is found
			for (deUint32 smpX = sampleXMin; smpX <= sampleXMax; ++smpX)
			{
				for (deUint32 smpY = sampleYMin; smpY <= sampleYMax; ++smpY)
				{
					const tcu::RGBA reference_color = referenceFrame.getPixel(smpX, smpY);

					if (compareColor(reference_color, rendered_color, colorThreshold, diff))
						matchFound = true;

					smpDiff = min(smpDiff, diff);
				}
			}

			maxDiff = tcu::max(maxDiff, smpDiff);
			errorMask.setPixel(matchFound ? tcu::IVec4(0, 0xff, 0, 0xff) : tcu::IVec4(0xff, 0, 0, 0xff), x, y);

			// Color mismatch
			if (!matchFound)
			{
				isOk = false;
			}
		}
	}

	const tcu::ConstPixelBufferAccess	result			= rendered.getAccess();
	const tcu::ConstPixelBufferAccess	reference		= referenceFrame.getAccess();
	const char*							imageSetName	= "Result";
	const char*							imageSetDesc	= "Image comparison result";
	tcu::Vec4							pixelBias		(0.0f, 0.0f, 0.0f, 0.0f);
	tcu::Vec4							pixelScale		(1.0f, 1.0f, 1.0f, 1.0f);

	if (!isOk)
	{
		// All formats except normalized unsigned fixed point ones need remapping in order to fit into unorm channels in logged images.
		if (tcu::getTextureChannelClass(reference.getFormat().type)	!= tcu::TEXTURECHANNELCLASS_UNSIGNED_FIXED_POINT ||
			tcu::getTextureChannelClass(result.getFormat().type)	!= tcu::TEXTURECHANNELCLASS_UNSIGNED_FIXED_POINT)
		{
			computeScaleAndBias(reference, result, pixelScale, pixelBias);
			log << TestLog::Message << "Result and reference images are normalized with formula p * " << pixelScale << " + " << pixelBias << TestLog::EndMessage;
		}

		log << TestLog::Message << "Image comparison failed: max difference = " << maxDiff << ", color threshold = " << colorThreshold.toIVec().cast<deUint32>()
		<<  ", coordinates threshold = " << coordThreshold << TestLog::EndMessage;

		log << TestLog::ImageSet(imageSetName, imageSetDesc)
			<< TestLog::Image("Result",		"Result",		result)
			<< TestLog::Image("ErrorMask",	"Error mask",	errorMask)
			<< TestLog::EndImageSet;
	}
	else
	{
		if (result.getFormat() != tcu::TextureFormat(tcu::TextureFormat::RGBA, tcu::TextureFormat::UNORM_INT8))
			computePixelScaleBias(result, pixelScale, pixelBias);

		log << TestLog::ImageSet(imageSetName, imageSetDesc)
			<< TestLog::Image("Result",		"Result",		result,		pixelScale, pixelBias)
			<< TestLog::EndImageSet;
	}


	return true;
}

tcu::TestStatus Compressed2DTestInstance::iterate (void)
{
	tcu::TestLog&					log				= m_context.getTestContext().getLog();
	const pipeline::TestTexture2D&	texture			= m_renderer.get2DTexture(0);
	const tcu::TextureFormat		textureFormat	= texture.getTextureFormat();
	const tcu::TextureFormatInfo	formatInfo		= tcu::getTextureFormatInfo(textureFormat);
	const deUint32					mipLevel		= m_testParameters.mipmaps ? 1 : 0;

	ReferenceParams					sampleParams	(TEXTURETYPE_2D);
	tcu::Surface					rendered		(m_renderer.getRenderWidth(), m_renderer.getRenderHeight());
	vector<float>					texCoord;

	// Setup params for reference.
	sampleParams.sampler			= util::createSampler(m_testParameters.wrapS, m_testParameters.wrapT, m_testParameters.minFilter, m_testParameters.magFilter);
	sampleParams.samplerType		= SAMPLERTYPE_FLOAT;
	sampleParams.lodMode			= LODMODE_EXACT;

	if (m_testParameters.mipmaps) {
		sampleParams.minLod = (float)mipLevel;
		sampleParams.maxLod = (float)mipLevel;
	}

	if (isAstcFormat(m_compressedFormat)
		|| m_compressedFormat == tcu::COMPRESSEDTEXFORMAT_BC4_UNORM_BLOCK
		|| m_compressedFormat == tcu::COMPRESSEDTEXFORMAT_BC5_UNORM_BLOCK)
	{
		sampleParams.colorBias			= tcu::Vec4(0.0f);
		sampleParams.colorScale			= tcu::Vec4(1.0f);
	}
	else if (m_compressedFormat == tcu::COMPRESSEDTEXFORMAT_BC4_SNORM_BLOCK)
	{
		sampleParams.colorBias			= tcu::Vec4(0.5f, 0.0f, 0.0f, 0.0f);
		sampleParams.colorScale			= tcu::Vec4(0.5f, 1.0f, 1.0f, 1.0f);
	}
	else if (m_compressedFormat == tcu::COMPRESSEDTEXFORMAT_BC5_SNORM_BLOCK)
	{
		sampleParams.colorBias			= tcu::Vec4(0.5f, 0.5f, 0.0f, 0.0f);
		sampleParams.colorScale			= tcu::Vec4(0.5f, 0.5f, 1.0f, 1.0f);
	}
	else
	{
		sampleParams.colorBias			= formatInfo.lookupBias;
		sampleParams.colorScale			= formatInfo.lookupScale;
	}

	log << TestLog::Message << "Compare reference value = " << sampleParams.ref << TestLog::EndMessage;

	// Compute texture coordinates.
	computeQuadTexCoord2D(texCoord, tcu::Vec2(0.0f, 0.0f), tcu::Vec2(1.0f, 1.0f));

	m_renderer.renderQuad(rendered, 0, &texCoord[0], sampleParams);

	// Compute reference.
	const tcu::IVec4		formatBitDepth	= getTextureFormatBitDepth(vk::mapVkFormat(VK_FORMAT_R8G8B8A8_UNORM));
	const tcu::PixelFormat	pixelFormat		(formatBitDepth[0], formatBitDepth[1], formatBitDepth[2], formatBitDepth[3]);

#ifdef CTS_USES_VULKANSC
	if (m_context.getTestContext().getCommandLine().isSubProcess())
#endif // CTS_USES_VULKANSC
	{
		// Compare and log.
		tcu::RGBA threshold;

		if (isBcBitExactFormat(m_compressedFormat))
			threshold = tcu::RGBA(1, 1, 1, 1);
		else if (isBcFormat(m_compressedFormat))
			threshold = tcu::RGBA(8, 8, 8, 8);
		else
			threshold = pixelFormat.getColorThreshold() + tcu::RGBA(2, 2, 2, 2);

		constexpr float coordThreshold = 0.01f;
		const bool isOk = validateTexture(log, rendered, texture.getTexture(), texCoord, mipLevel, pixelFormat, threshold, coordThreshold, sampleParams);

		return isOk ? tcu::TestStatus::pass("Pass") : tcu::TestStatus::fail("Image verification failed");
	}
	return tcu::TestStatus::pass("Pass");
}

class Compressed3DTestInstance : public TestInstance
{
public:
	typedef Compressed3DTestParameters	ParameterType;

										Compressed3DTestInstance	(Context&				context,
																	 const ParameterType&	testParameters);
	tcu::TestStatus						iterate						(void);

private:
										Compressed3DTestInstance	(const Compressed3DTestInstance& other);
	Compressed3DTestInstance&			operator=					(const Compressed3DTestInstance& other);

	const ParameterType&				m_testParameters;
	const tcu::CompressedTexFormat		m_compressedFormat;
	TestTexture3DSp						m_texture3D;
	TextureRenderer						m_renderer3D;
};

Compressed3DTestInstance::Compressed3DTestInstance (Context&				context,
													const ParameterType&	testParameters)
	: TestInstance			(context)
	, m_testParameters		(testParameters)
	, m_compressedFormat	(mapVkCompressedFormat(testParameters.format))
	, m_texture3D			(TestTexture3DSp(new pipeline::TestTexture3D(m_compressedFormat, testParameters.width, testParameters.height, testParameters.depth)))
	, m_renderer3D			(context, testParameters.sampleCount, testParameters.width, testParameters.height, testParameters.depth, makeComponentMappingRGBA(), VK_IMAGE_TYPE_3D, VK_IMAGE_VIEW_TYPE_3D)
{
	m_renderer3D.add3DTexture		(m_texture3D, testParameters.aspectMask, testParameters.backingMode);

	VkPhysicalDeviceFeatures		physicalFeatures;
	context.getInstanceInterface().getPhysicalDeviceFeatures(context.getPhysicalDevice(), &physicalFeatures);

	if (tcu::isAstcFormat(m_compressedFormat))
	{
		if (!physicalFeatures.textureCompressionASTC_LDR)
			throw tcu::NotSupportedError(std::string("Unsupported format: ") + getFormatName(testParameters.format));
	}
	else if (tcu::isEtcFormat(m_compressedFormat))
	{
		if (!physicalFeatures.textureCompressionETC2)
			throw tcu::NotSupportedError(std::string("Unsupported format: ") + getFormatName(testParameters.format));
	}
	else if(tcu::isBcFormat(m_compressedFormat))
	{
		if (!physicalFeatures.textureCompressionBC)
			throw tcu::NotSupportedError(std::string("Unsupported format: ") + getFormatName(testParameters.format));
	}
	else
	{
		DE_FATAL("Unsupported compressed format");
	}
}

tcu::TestStatus Compressed3DTestInstance::iterate (void)
{
	tcu::TestLog&					log				= m_context.getTestContext().getLog();
	const pipeline::TestTexture3D&	texture			= m_renderer3D.get3DTexture(0);
	const tcu::TextureFormat		textureFormat	= texture.getTextureFormat();
	const tcu::TextureFormatInfo	formatInfo		= tcu::getTextureFormatInfo(textureFormat);
	const deUint32					mipLevel		= m_testParameters.mipmaps ? 1 : 0;

	ReferenceParams					sampleParams	(TEXTURETYPE_3D);
	tcu::Surface					rendered		(m_renderer3D.getRenderWidth(), m_renderer3D.getRenderHeight());
	vector<float>					texCoord;

	// Setup params for reference.
	sampleParams.sampler			= util::createSampler(m_testParameters.wrapS, m_testParameters.wrapT, m_testParameters.minFilter, m_testParameters.magFilter);
	sampleParams.samplerType		= SAMPLERTYPE_FLOAT;
	sampleParams.lodMode			= LODMODE_EXACT;

	if (m_testParameters.mipmaps) {
		sampleParams.minLod = (float)mipLevel;
		sampleParams.maxLod = (float)mipLevel;
	}

	if (isAstcFormat(m_compressedFormat)
		|| m_compressedFormat == tcu::COMPRESSEDTEXFORMAT_BC4_UNORM_BLOCK
		|| m_compressedFormat == tcu::COMPRESSEDTEXFORMAT_BC5_UNORM_BLOCK)
	{
		sampleParams.colorBias			= tcu::Vec4(0.0f);
		sampleParams.colorScale			= tcu::Vec4(1.0f);
	}
	else if (m_compressedFormat == tcu::COMPRESSEDTEXFORMAT_BC4_SNORM_BLOCK)
	{
		sampleParams.colorBias			= tcu::Vec4(0.5f, 0.0f, 0.0f, 0.0f);
		sampleParams.colorScale			= tcu::Vec4(0.5f, 1.0f, 1.0f, 1.0f);
	}
	else if (m_compressedFormat == tcu::COMPRESSEDTEXFORMAT_BC5_SNORM_BLOCK)
	{
		sampleParams.colorBias			= tcu::Vec4(0.5f, 0.5f, 0.0f, 0.0f);
		sampleParams.colorScale			= tcu::Vec4(0.5f, 0.5f, 1.0f, 1.0f);
	}
	else
	{
		sampleParams.colorBias			= formatInfo.lookupBias;
		sampleParams.colorScale			= formatInfo.lookupScale;
	}

	log << TestLog::Message << "Compare reference value = " << sampleParams.ref << TestLog::EndMessage;

	constexpr deUint32		slices			= 3;
	deUint32				sliceNdx		= 0;
	float					z				= 0;
	bool					isOk			= false;
	const tcu::IVec4		formatBitDepth	= getTextureFormatBitDepth(vk::mapVkFormat(VK_FORMAT_R8G8B8A8_UNORM));
	const tcu::PixelFormat	pixelFormat	(formatBitDepth[0], formatBitDepth[1], formatBitDepth[2], formatBitDepth[3]);
	tcu::RGBA				threshold;

	if (isBcBitExactFormat(m_compressedFormat))
		threshold = tcu::RGBA(1, 1, 1, 1);
	else if (isBcSRGBFormat(m_compressedFormat))
		threshold = tcu::RGBA(9, 9, 9, 9);
	else if (isBcFormat(m_compressedFormat))
		threshold = tcu::RGBA(8, 8, 8, 8);
	else
		threshold = pixelFormat.getColorThreshold() + tcu::RGBA(2, 2, 2, 2);

	for (deUint32 s = 0; s < slices; ++s)
	{
		// Test different slices of 3D texture.

		sliceNdx = (m_testParameters.depth - 1) * s / (slices - 1);

		// Render texture.
		z = (((float)sliceNdx + 0.5f) / (float)(m_testParameters.depth >> mipLevel));
		computeQuadTexCoord3D(texCoord, tcu::Vec3(0.0f, 0.0f, z), tcu::Vec3(1.0f, 1.0f, z), tcu::IVec3(0,1,2));
		m_renderer3D.renderQuad(rendered, 0, &texCoord[0], sampleParams);

		// Compare and log.
#ifdef CTS_USES_VULKANSC
		if (m_context.getTestContext().getCommandLine().isSubProcess())
#endif // CTS_USES_VULKANSC
		{
			constexpr float coordThreshold = 0.01f;
			isOk = validateTexture(log, rendered, m_texture3D->getTexture(), texCoord, mipLevel, pixelFormat, threshold, coordThreshold, sampleParams);

			if (!isOk)
				break;
		}
	}
	return isOk ? tcu::TestStatus::pass("Pass") : tcu::TestStatus::fail("Image verification failed");
}

} // anonymous

void populateTextureCompressedFormatTests (tcu::TestCaseGroup* compressedTextureTests)
{
	tcu::TestContext&	testCtx	= compressedTextureTests->getTestContext();

	for (int sizeNdx = 0; sizeNdx < DE_LENGTH_OF_ARRAY(sizes); sizeNdx++)
	for (int formatNdx = 0; formatNdx < DE_LENGTH_OF_ARRAY(formats); formatNdx++)
	for (int backingNdx = 0; backingNdx < DE_LENGTH_OF_ARRAY(backingModes); backingNdx++)
	{
		const string	formatStr	= de::toString(getFormatStr(formats[formatNdx].format));
		const string	nameBase	= de::toLower(formatStr.substr(10));

		Compressed2DTestParameters	testParameters;
		testParameters.format		= formats[formatNdx].format;
		testParameters.backingMode	= backingModes[backingNdx].backingMode;
		testParameters.width		= sizes[sizeNdx].width;
		testParameters.height		= sizes[sizeNdx].height;
		testParameters.minFilter	= tcu::Sampler::NEAREST_MIPMAP_NEAREST;
		testParameters.magFilter	= tcu::Sampler::NEAREST;
		testParameters.aspectMask	= VK_IMAGE_ASPECT_COLOR_BIT;
		testParameters.programs.push_back(PROGRAM_2D_FLOAT);
		testParameters.mipmaps		= sizes[sizeNdx].mipmaps;

		compressedTextureTests->addChild(new TextureTestCase<Compressed2DTestInstance>(testCtx, (nameBase + "_2d_" + sizes[sizeNdx].name + backingModes[backingNdx].name).c_str(), (formatStr + ", TEXTURETYPE_2D").c_str(), testParameters));
	}
}

void populate3DTextureCompressedFormatTests (tcu::TestCaseGroup* compressedTextureTests)
{
	tcu::TestContext&	testCtx	= compressedTextureTests->getTestContext();

	for (int sizeNdx = 0; sizeNdx < DE_LENGTH_OF_ARRAY(sizes); ++sizeNdx)
	for (int formatNdx = 0; formatNdx < DE_LENGTH_OF_ARRAY(formats); ++formatNdx)
	for (int backingNdx = 0; backingNdx < DE_LENGTH_OF_ARRAY(backingModes); ++backingNdx)
	{
		const string	formatStr	= de::toString(getFormatStr(formats[formatNdx].format));
		const string	nameBase	= de::toLower(formatStr.substr(10));

		Compressed3DTestParameters	testParameters;
		testParameters.format		= formats[formatNdx].format;
		testParameters.backingMode	= backingModes[backingNdx].backingMode;
		testParameters.width		= sizes[sizeNdx].width;
		testParameters.height		= sizes[sizeNdx].height;
		testParameters.depth		= sizes[sizeNdx].depth;
		testParameters.minFilter	= tcu::Sampler::NEAREST_MIPMAP_NEAREST;
		testParameters.magFilter	= tcu::Sampler::NEAREST;
		testParameters.aspectMask	= VK_IMAGE_ASPECT_COLOR_BIT;
		testParameters.programs.push_back(PROGRAM_3D_FLOAT);
		testParameters.mipmaps		= sizes[sizeNdx].mipmaps;

		compressedTextureTests->addChild(new TextureTestCase<Compressed3DTestInstance>(testCtx, (nameBase + "_3d_" + sizes[sizeNdx].name + backingModes[backingNdx].name).c_str(), (formatStr + ", TEXTURETYPE_3D").c_str(), testParameters));
	}
}

tcu::TestCaseGroup* createTextureCompressedFormatTests (tcu::TestContext& testCtx)
{
	return createTestGroup(testCtx, "compressed", "Texture compressed format tests.", populateTextureCompressedFormatTests);
}

tcu::TestCaseGroup* create3DTextureCompressedFormatTests (tcu::TestContext& testCtx)
{
	return createTestGroup(testCtx, "compressed_3D", "3D texture compressed format tests.", populate3DTextureCompressedFormatTests);
}

} // texture
} // vkt