modules/gles31/functional/es31fFboTestCase.cpp - third_party/vulkan-cts - Git at Google

 /*-------------------------------------------------------------------------
  * drawElements Quality Program OpenGL ES 3.1 Module
  * -------------------------------------------------
  *
  * Copyright 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 Base class for FBO tests.
  *//*--------------------------------------------------------------------*/

 #include "es31fFboTestCase.hpp"
 #include "es31fFboTestUtil.hpp"
 #include "tcuTestLog.hpp"
 #include "tcuImageCompare.hpp"
 #include "tcuRenderTarget.hpp"
 #include "sglrGLContext.hpp"
 #include "sglrReferenceContext.hpp"
 #include "gluStrUtil.hpp"
 #include "gluContextInfo.hpp"
 #include "deRandom.hpp"
 #include "glwEnums.hpp"
 #include "glwFunctions.hpp"

 #include <algorithm>

 namespace deqp
 {
 namespace gles31
 {
 namespace Functional
 {

 using tcu::TestLog;
 using std::string;

 FboTestCase::FboTestCase (Context& context, const char* name, const char* description, bool useScreenSizedViewport)
 	: TestCase			(context, name, description)
 	, m_viewportWidth	(useScreenSizedViewport ? context.getRenderTarget().getWidth() : 128)
 	, m_viewportHeight	(useScreenSizedViewport ? context.getRenderTarget().getHeight() : 128)
 {
 }

 FboTestCase::~FboTestCase (void)
 {
 }

 FboTestCase::IterateResult FboTestCase::iterate (void)
 {
 	glu::RenderContext&			renderCtx		= TestCase::m_context.getRenderContext();
 	const tcu::RenderTarget&	renderTarget	= renderCtx.getRenderTarget();
 	TestLog&					log				= m_testCtx.getLog();

 	// Viewport.
 	de::Random					rnd				(deStringHash(getName()));
 	int							width			= deMin32(renderTarget.getWidth(),	m_viewportWidth);
 	int							height			= deMin32(renderTarget.getHeight(),	m_viewportHeight);
 	int							x				= rnd.getInt(0, renderTarget.getWidth()		- width);
 	int							y				= rnd.getInt(0, renderTarget.getHeight()	- height);

 	// Surface format and storage is choosen by render().
 	tcu::Surface				reference;
 	tcu::Surface				result;

 	// Call preCheck() that can throw exception if some requirement is not met.
 	preCheck();

 	log << TestLog::Message << "Rendering with GL driver" << TestLog::EndMessage;

 	// Render using GLES3.1
 	try
 	{
 		sglr::GLContext context(renderCtx, log, 0, tcu::IVec4(x, y, width, height));
 		setContext(&context);
 		render(result);

 		// Check error.
 		deUint32 err = glGetError();
 		if (err != GL_NO_ERROR)
 			throw glu::Error(err, glu::getErrorStr(err).toString().c_str(), DE_NULL, __FILE__, __LINE__);

 		setContext(DE_NULL);
 	}
 	catch (const FboTestUtil::FboIncompleteException& e)
 	{
 		if (e.getReason() == GL_FRAMEBUFFER_UNSUPPORTED)
 		{
 			log << e;
 			m_testCtx.setTestResult(QP_TEST_RESULT_NOT_SUPPORTED, "Not supported");
 			return STOP;
 		}
 		else
 			throw;
 	}

 	log << TestLog::Message << "Rendering reference image" << TestLog::EndMessage;

 	// Render reference.
 	{
 		sglr::ReferenceContextBuffers	buffers	(tcu::PixelFormat(8,8,8,renderTarget.getPixelFormat().alphaBits?8:0), renderTarget.getDepthBits(), renderTarget.getStencilBits(), width, height);
 		sglr::ReferenceContext			context	(sglr::ReferenceContextLimits(renderCtx), buffers.getColorbuffer(), buffers.getDepthbuffer(), buffers.getStencilbuffer());

 		setContext(&context);
 		render(reference);
 		setContext(DE_NULL);
 	}

 	bool isOk = compare(reference, result);
 	m_testCtx.setTestResult(isOk ? QP_TEST_RESULT_PASS	: QP_TEST_RESULT_FAIL,
 							isOk ? "Pass"				: "Image comparison failed");
 	return STOP;
 }

 bool FboTestCase::compare (const tcu::Surface& reference, const tcu::Surface& result)
 {
 	return tcu::fuzzyCompare(m_testCtx.getLog(), "Result", "Image comparison result", reference, result, 0.05f, tcu::COMPARE_LOG_RESULT);
 }

 void FboTestCase::readPixels (tcu::Surface& dst, int x, int y, int width, int height, const tcu::TextureFormat& format, const tcu::Vec4& scale, const tcu::Vec4& bias)
 {
 	FboTestUtil::readPixels(*getCurrentContext(), dst, x, y, width, height, format, scale, bias);
 }

 void FboTestCase::readPixels (tcu::Surface& dst, int x, int y, int width, int height)
 {
 	getCurrentContext()->readPixels(dst, x, y, width, height);
 }

 void FboTestCase::checkFramebufferStatus (deUint32 target)
 {
 	deUint32 status = glCheckFramebufferStatus(target);
 	if (status != GL_FRAMEBUFFER_COMPLETE)
 		throw FboTestUtil::FboIncompleteException(status, __FILE__, __LINE__);
 }

 void FboTestCase::checkError (void)
 {
 	deUint32 err = glGetError();
 	if (err != GL_NO_ERROR)
 		throw glu::Error((int)err, (string("Got ") + glu::getErrorStr(err).toString()).c_str(), DE_NULL, __FILE__, __LINE__);
 }

 static bool isRequiredFormat (deUint32 format, glu::RenderContext& renderContext)
 {
 	const bool supportsES32 = glu::contextSupports(renderContext.getType(), glu::ApiType::es(3, 2));
 	const bool supportsGL45 = glu::contextSupports(renderContext.getType(), glu::ApiType::core(4, 5));
 	switch (format)
 	{
 		// Color-renderable formats
 		case GL_RGBA32I:
 		case GL_RGBA32UI:
 		case GL_RGBA16I:
 		case GL_RGBA16UI:
 		case GL_RGBA8:
 		case GL_RGBA8I:
 		case GL_RGBA8UI:
 		case GL_SRGB8_ALPHA8:
 		case GL_RGB10_A2:
 		case GL_RGB10_A2UI:
 		case GL_RGBA4:
 		case GL_RGB5_A1:
 		case GL_RGB8:
 		case GL_RGB565:
 		case GL_RG32I:
 		case GL_RG32UI:
 		case GL_RG16I:
 		case GL_RG16UI:
 		case GL_RG8:
 		case GL_RG8I:
 		case GL_RG8UI:
 		case GL_R32I:
 		case GL_R32UI:
 		case GL_R16I:
 		case GL_R16UI:
 		case GL_R8:
 		case GL_R8I:
 		case GL_R8UI:
 			return true;

 		// Depth formats
 		case GL_DEPTH_COMPONENT32F:
 		case GL_DEPTH_COMPONENT24:
 		case GL_DEPTH_COMPONENT16:
 			return true;

 		// Depth+stencil formats
 		case GL_DEPTH32F_STENCIL8:
 		case GL_DEPTH24_STENCIL8:
 			return true;

 		// Stencil formats
 		case GL_STENCIL_INDEX8:
 			return true;

 		// Float format
 		case GL_RGBA32F:
 		case GL_R11F_G11F_B10F:
 		case GL_RG32F:
 		case GL_R32F:
 		case GL_RGBA16F:
 		case GL_RG16F:
 		case GL_R16F:
 			return supportsES32 || supportsGL45;
 		case GL_RGB16F:
 			return supportsGL45;

 		default:
 			return false;
 	}
 }

 static std::vector<std::string> getEnablingExtensions (deUint32 format, glu::RenderContext& renderContext)
 {
 	const bool					supportsES32 = glu::contextSupports(renderContext.getType(), glu::ApiType::es(3, 2));
 	std::vector<std::string>	out;

 	DE_ASSERT(!isRequiredFormat(format, renderContext));

 	switch (format)
 	{
 		case GL_RGB16F:
 			out.push_back("GL_EXT_color_buffer_half_float");
 			break;

 		case GL_RGB32F:
 			out.push_back("GL_EXT_color_buffer_float");
 			break;

 		case GL_RGBA16F:
 		case GL_RG16F:
 		case GL_R16F:
 			if (!supportsES32)
 				out.push_back("GL_EXT_color_buffer_half_float");
 			break;

 		case GL_RGBA32F:
 		case GL_R11F_G11F_B10F:
 		case GL_RG32F:
 		case GL_R32F:
 			if (!supportsES32)
 				out.push_back("GL_EXT_color_buffer_float");
 			break;

 		case GL_R16:
 		case GL_RG16:
 		case GL_RGBA16:
 			out.push_back("GL_EXT_texture_norm16");
 			break;

 		default:
 			break;
 	}

 	return out;
 }

 static bool isAnyExtensionSupported (Context& context, const std::vector<std::string>& requiredExts)
 {
 	for (std::vector<std::string>::const_iterator iter = requiredExts.begin(); iter != requiredExts.end(); iter++)
 	{
 		const std::string& extension = *iter;

 		if (context.getContextInfo().isExtensionSupported(extension.c_str()))
 			return true;
 	}

 	return false;
 }

 void FboTestCase::checkFormatSupport (deUint32 sizedFormat)
 {
 	const bool						isCoreFormat	= isRequiredFormat(sizedFormat, m_context.getRenderContext());
 	const std::vector<std::string>	requiredExts	= (!isCoreFormat) ? getEnablingExtensions(sizedFormat, m_context.getRenderContext()) : std::vector<std::string>();

 	// Check that we don't try to use invalid formats.
 	DE_ASSERT(isCoreFormat || !requiredExts.empty());

 	if (!requiredExts.empty() && !isAnyExtensionSupported(m_context, requiredExts))
 		throw tcu::NotSupportedError("Format not supported");
 }

 static int getMinimumSampleCount (deUint32 format)
 {
 	switch (format)
 	{
 		// Core formats
 		case GL_RGBA32I:
 		case GL_RGBA32UI:
 		case GL_RGBA16I:
 		case GL_RGBA16UI:
 		case GL_RGBA8:
 		case GL_RGBA8I:
 		case GL_RGBA8UI:
 		case GL_SRGB8_ALPHA8:
 		case GL_RGB10_A2:
 		case GL_RGB10_A2UI:
 		case GL_RGBA4:
 		case GL_RGB5_A1:
 		case GL_RGB8:
 		case GL_RGB565:
 		case GL_RG32I:
 		case GL_RG32UI:
 		case GL_RG16I:
 		case GL_RG16UI:
 		case GL_RG8:
 		case GL_RG8I:
 		case GL_RG8UI:
 		case GL_R32I:
 		case GL_R32UI:
 		case GL_R16I:
 		case GL_R16UI:
 		case GL_R8:
 		case GL_R8I:
 		case GL_R8UI:
 		case GL_DEPTH_COMPONENT32F:
 		case GL_DEPTH_COMPONENT24:
 		case GL_DEPTH_COMPONENT16:
 		case GL_DEPTH32F_STENCIL8:
 		case GL_DEPTH24_STENCIL8:
 		case GL_STENCIL_INDEX8:
 			return 4;

 		// GL_EXT_color_buffer_float
 		case GL_R11F_G11F_B10F:
 		case GL_RG16F:
 		case GL_R16F:
 			return 4;

 		case GL_RGBA32F:
 		case GL_RGBA16F:
 		case GL_RG32F:
 		case GL_R32F:
 			return 0;

 		// GL_EXT_color_buffer_half_float
 		case GL_RGB16F:
 			return 0;

 		default:
 			DE_FATAL("Unknown format");
 			return 0;
 	}
 }

 static std::vector<int> querySampleCounts (const glw::Functions& gl, deUint32 format)
 {
 	int					numSampleCounts		= 0;
 	std::vector<int>	sampleCounts;

 	gl.getInternalformativ(GL_RENDERBUFFER, format, GL_NUM_SAMPLE_COUNTS, 1, &numSampleCounts);

 	if (numSampleCounts > 0)
 	{
 		sampleCounts.resize(numSampleCounts);
 		gl.getInternalformativ(GL_RENDERBUFFER, format, GL_SAMPLES, (glw::GLsizei)sampleCounts.size(), &sampleCounts[0]);
 	}

 	GLU_EXPECT_NO_ERROR(gl.getError(), "Failed to query sample counts for format");

 	return sampleCounts;
 }

 void FboTestCase::checkSampleCount (deUint32 sizedFormat, int numSamples)
 {
 	const int minSampleCount = getMinimumSampleCount(sizedFormat);

 	if (numSamples > minSampleCount)
 	{
 		// Exceeds spec-mandated minimum - need to check.
 		const std::vector<int> supportedSampleCounts = querySampleCounts(m_context.getRenderContext().getFunctions(), sizedFormat);

 		if (std::find(supportedSampleCounts.begin(), supportedSampleCounts.end(), numSamples) == supportedSampleCounts.end())
 			throw tcu::NotSupportedError("Sample count not supported");
 	}
 }

 void FboTestCase::clearColorBuffer (const tcu::TextureFormat& format, const tcu::Vec4& value)
 {
 	FboTestUtil::clearColorBuffer(*getCurrentContext(), format, value);
 }

 } // Functional
 } // gles31
 } // deqp
	/*-------------------------------------------------------------------------
	* drawElements Quality Program OpenGL ES 3.1 Module
	* -------------------------------------------------
	*
	* Copyright 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 Base class for FBO tests.
	//--------------------------------------------------------------------*/

	#include "es31fFboTestCase.hpp"
	#include "es31fFboTestUtil.hpp"
	#include "tcuTestLog.hpp"
	#include "tcuImageCompare.hpp"
	#include "tcuRenderTarget.hpp"
	#include "sglrGLContext.hpp"
	#include "sglrReferenceContext.hpp"
	#include "gluStrUtil.hpp"
	#include "gluContextInfo.hpp"
	#include "deRandom.hpp"
	#include "glwEnums.hpp"
	#include "glwFunctions.hpp"

	#include <algorithm>

	namespace deqp
	{
	namespace gles31
	{
	namespace Functional
	{

	using tcu::TestLog;
	using std::string;

	FboTestCase::FboTestCase (Context& context, const char* name, const char* description, bool useScreenSizedViewport)
	: TestCase (context, name, description)
	, m_viewportWidth (useScreenSizedViewport ? context.getRenderTarget().getWidth() : 128)
	, m_viewportHeight (useScreenSizedViewport ? context.getRenderTarget().getHeight() : 128)
	{
	}

	FboTestCase::~FboTestCase (void)
	{
	}

	FboTestCase::IterateResult FboTestCase::iterate (void)
	{
	glu::RenderContext& renderCtx = TestCase::m_context.getRenderContext();
	const tcu::RenderTarget& renderTarget = renderCtx.getRenderTarget();
	TestLog& log = m_testCtx.getLog();

	// Viewport.
	de::Random rnd (deStringHash(getName()));
	int width = deMin32(renderTarget.getWidth(), m_viewportWidth);
	int height = deMin32(renderTarget.getHeight(), m_viewportHeight);
	int x = rnd.getInt(0, renderTarget.getWidth() - width);
	int y = rnd.getInt(0, renderTarget.getHeight() - height);

	// Surface format and storage is choosen by render().
	tcu::Surface reference;
	tcu::Surface result;

	// Call preCheck() that can throw exception if some requirement is not met.
	preCheck();

	log << TestLog::Message << "Rendering with GL driver" << TestLog::EndMessage;

	// Render using GLES3.1
	try
	{
	sglr::GLContext context(renderCtx, log, 0, tcu::IVec4(x, y, width, height));
	setContext(&context);
	render(result);

	// Check error.
	deUint32 err = glGetError();
	if (err != GL_NO_ERROR)
	throw glu::Error(err, glu::getErrorStr(err).toString().c_str(), DE_NULL, __FILE__, __LINE__);

	setContext(DE_NULL);
	}
	catch (const FboTestUtil::FboIncompleteException& e)
	{
	if (e.getReason() == GL_FRAMEBUFFER_UNSUPPORTED)
	{
	log << e;
	m_testCtx.setTestResult(QP_TEST_RESULT_NOT_SUPPORTED, "Not supported");
	return STOP;
	}
	else
	throw;
	}

	log << TestLog::Message << "Rendering reference image" << TestLog::EndMessage;

	// Render reference.
	{
	sglr::ReferenceContextBuffers buffers (tcu::PixelFormat(8,8,8,renderTarget.getPixelFormat().alphaBits?8:0), renderTarget.getDepthBits(), renderTarget.getStencilBits(), width, height);
	sglr::ReferenceContext context (sglr::ReferenceContextLimits(renderCtx), buffers.getColorbuffer(), buffers.getDepthbuffer(), buffers.getStencilbuffer());

	setContext(&context);
	render(reference);
	setContext(DE_NULL);
	}

	bool isOk = compare(reference, result);
	m_testCtx.setTestResult(isOk ? QP_TEST_RESULT_PASS : QP_TEST_RESULT_FAIL,
	isOk ? "Pass" : "Image comparison failed");
	return STOP;
	}

	bool FboTestCase::compare (const tcu::Surface& reference, const tcu::Surface& result)
	{
	return tcu::fuzzyCompare(m_testCtx.getLog(), "Result", "Image comparison result", reference, result, 0.05f, tcu::COMPARE_LOG_RESULT);
	}

	void FboTestCase::readPixels (tcu::Surface& dst, int x, int y, int width, int height, const tcu::TextureFormat& format, const tcu::Vec4& scale, const tcu::Vec4& bias)
	{
	FboTestUtil::readPixels(*getCurrentContext(), dst, x, y, width, height, format, scale, bias);
	}

	void FboTestCase::readPixels (tcu::Surface& dst, int x, int y, int width, int height)
	{
	getCurrentContext()->readPixels(dst, x, y, width, height);
	}

	void FboTestCase::checkFramebufferStatus (deUint32 target)
	{
	deUint32 status = glCheckFramebufferStatus(target);
	if (status != GL_FRAMEBUFFER_COMPLETE)
	throw FboTestUtil::FboIncompleteException(status, __FILE__, __LINE__);
	}

	void FboTestCase::checkError (void)
	{
	deUint32 err = glGetError();
	if (err != GL_NO_ERROR)
	throw glu::Error((int)err, (string("Got ") + glu::getErrorStr(err).toString()).c_str(), DE_NULL, __FILE__, __LINE__);
	}

	static bool isRequiredFormat (deUint32 format, glu::RenderContext& renderContext)
	{
	const bool supportsES32 = glu::contextSupports(renderContext.getType(), glu::ApiType::es(3, 2));
	const bool supportsGL45 = glu::contextSupports(renderContext.getType(), glu::ApiType::core(4, 5));
	switch (format)
	{
	// Color-renderable formats
	case GL_RGBA32I:
	case GL_RGBA32UI:
	case GL_RGBA16I:
	case GL_RGBA16UI:
	case GL_RGBA8:
	case GL_RGBA8I:
	case GL_RGBA8UI:
	case GL_SRGB8_ALPHA8:
	case GL_RGB10_A2:
	case GL_RGB10_A2UI:
	case GL_RGBA4:
	case GL_RGB5_A1:
	case GL_RGB8:
	case GL_RGB565:
	case GL_RG32I:
	case GL_RG32UI:
	case GL_RG16I:
	case GL_RG16UI:
	case GL_RG8:
	case GL_RG8I:
	case GL_RG8UI:
	case GL_R32I:
	case GL_R32UI:
	case GL_R16I:
	case GL_R16UI:
	case GL_R8:
	case GL_R8I:
	case GL_R8UI:
	return true;

	// Depth formats
	case GL_DEPTH_COMPONENT32F:
	case GL_DEPTH_COMPONENT24:
	case GL_DEPTH_COMPONENT16:
	return true;

	// Depth+stencil formats
	case GL_DEPTH32F_STENCIL8:
	case GL_DEPTH24_STENCIL8:
	return true;

	// Stencil formats
	case GL_STENCIL_INDEX8:
	return true;

	// Float format
	case GL_RGBA32F:
	case GL_R11F_G11F_B10F:
	case GL_RG32F:
	case GL_R32F:
	case GL_RGBA16F:
	case GL_RG16F:
	case GL_R16F:
	return supportsES32 \|\| supportsGL45;
	case GL_RGB16F:
	return supportsGL45;

	default:
	return false;
	}
	}

	static std::vector<std::string> getEnablingExtensions (deUint32 format, glu::RenderContext& renderContext)
	{
	const bool supportsES32 = glu::contextSupports(renderContext.getType(), glu::ApiType::es(3, 2));
	std::vector<std::string> out;

	DE_ASSERT(!isRequiredFormat(format, renderContext));

	switch (format)
	{
	case GL_RGB16F:
	out.push_back("GL_EXT_color_buffer_half_float");
	break;

	case GL_RGB32F:
	out.push_back("GL_EXT_color_buffer_float");
	break;

	case GL_RGBA16F:
	case GL_RG16F:
	case GL_R16F:
	if (!supportsES32)
	out.push_back("GL_EXT_color_buffer_half_float");
	break;

	case GL_RGBA32F:
	case GL_R11F_G11F_B10F:
	case GL_RG32F:
	case GL_R32F:
	if (!supportsES32)
	out.push_back("GL_EXT_color_buffer_float");
	break;

	case GL_R16:
	case GL_RG16:
	case GL_RGBA16:
	out.push_back("GL_EXT_texture_norm16");
	break;

	default:
	break;
	}

	return out;
	}

	static bool isAnyExtensionSupported (Context& context, const std::vector<std::string>& requiredExts)
	{
	for (std::vector<std::string>::const_iterator iter = requiredExts.begin(); iter != requiredExts.end(); iter++)
	{
	const std::string& extension = *iter;

	if (context.getContextInfo().isExtensionSupported(extension.c_str()))
	return true;
	}

	return false;
	}

	void FboTestCase::checkFormatSupport (deUint32 sizedFormat)
	{
	const bool isCoreFormat = isRequiredFormat(sizedFormat, m_context.getRenderContext());
	const std::vector<std::string> requiredExts = (!isCoreFormat) ? getEnablingExtensions(sizedFormat, m_context.getRenderContext()) : std::vector<std::string>();

	// Check that we don't try to use invalid formats.
	DE_ASSERT(isCoreFormat \|\| !requiredExts.empty());

	if (!requiredExts.empty() && !isAnyExtensionSupported(m_context, requiredExts))
	throw tcu::NotSupportedError("Format not supported");
	}

	static int getMinimumSampleCount (deUint32 format)
	{
	switch (format)
	{
	// Core formats
	case GL_RGBA32I:
	case GL_RGBA32UI:
	case GL_RGBA16I:
	case GL_RGBA16UI:
	case GL_RGBA8:
	case GL_RGBA8I:
	case GL_RGBA8UI:
	case GL_SRGB8_ALPHA8:
	case GL_RGB10_A2:
	case GL_RGB10_A2UI:
	case GL_RGBA4:
	case GL_RGB5_A1:
	case GL_RGB8:
	case GL_RGB565:
	case GL_RG32I:
	case GL_RG32UI:
	case GL_RG16I:
	case GL_RG16UI:
	case GL_RG8:
	case GL_RG8I:
	case GL_RG8UI:
	case GL_R32I:
	case GL_R32UI:
	case GL_R16I:
	case GL_R16UI:
	case GL_R8:
	case GL_R8I:
	case GL_R8UI:
	case GL_DEPTH_COMPONENT32F:
	case GL_DEPTH_COMPONENT24:
	case GL_DEPTH_COMPONENT16:
	case GL_DEPTH32F_STENCIL8:
	case GL_DEPTH24_STENCIL8:
	case GL_STENCIL_INDEX8:
	return 4;

	// GL_EXT_color_buffer_float
	case GL_R11F_G11F_B10F:
	case GL_RG16F:
	case GL_R16F:
	return 4;

	case GL_RGBA32F:
	case GL_RGBA16F:
	case GL_RG32F:
	case GL_R32F:
	return 0;

	// GL_EXT_color_buffer_half_float
	case GL_RGB16F:
	return 0;

	default:
	DE_FATAL("Unknown format");
	return 0;
	}
	}

	static std::vector<int> querySampleCounts (const glw::Functions& gl, deUint32 format)
	{
	int numSampleCounts = 0;
	std::vector<int> sampleCounts;

	gl.getInternalformativ(GL_RENDERBUFFER, format, GL_NUM_SAMPLE_COUNTS, 1, &numSampleCounts);

	if (numSampleCounts > 0)
	{
	sampleCounts.resize(numSampleCounts);
	gl.getInternalformativ(GL_RENDERBUFFER, format, GL_SAMPLES, (glw::GLsizei)sampleCounts.size(), &sampleCounts[0]);
	}

	GLU_EXPECT_NO_ERROR(gl.getError(), "Failed to query sample counts for format");

	return sampleCounts;
	}

	void FboTestCase::checkSampleCount (deUint32 sizedFormat, int numSamples)
	{
	const int minSampleCount = getMinimumSampleCount(sizedFormat);

	if (numSamples > minSampleCount)
	{
	// Exceeds spec-mandated minimum - need to check.
	const std::vector<int> supportedSampleCounts = querySampleCounts(m_context.getRenderContext().getFunctions(), sizedFormat);

	if (std::find(supportedSampleCounts.begin(), supportedSampleCounts.end(), numSamples) == supportedSampleCounts.end())
	throw tcu::NotSupportedError("Sample count not supported");
	}
	}

	void FboTestCase::clearColorBuffer (const tcu::TextureFormat& format, const tcu::Vec4& value)
	{
	FboTestUtil::clearColorBuffer(*getCurrentContext(), format, value);
	}

	} // Functional
	} // gles31
	} // deqp