xref: /third_party/vk-gl-cts/modules/gles2/functional/es2fRasterizationTests.cpp

/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES 2.0 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 Functional rasterization tests.
 *//*--------------------------------------------------------------------*/

#include "es2fRasterizationTests.hpp"
#include "tcuRasterizationVerifier.hpp"
#include "tcuSurface.hpp"
#include "tcuRenderTarget.hpp"
#include "tcuVectorUtil.hpp"
#include "tcuStringTemplate.hpp"
#include "tcuResultCollector.hpp"
#include "gluShaderProgram.hpp"
#include "gluRenderContext.hpp"
#include "gluPixelTransfer.hpp"
#include "gluStrUtil.hpp"
#include "deStringUtil.hpp"
#include "deRandom.hpp"
#include "glwFunctions.hpp"
#include "glwEnums.hpp"

#include <vector>

namespace deqp
{
namespace gles2
{
namespace Functional
{
namespace
{

using tcu::RasterizationArguments;
using tcu::TriangleSceneSpec;
using tcu::PointSceneSpec;
using tcu::LineSceneSpec;
using tcu::LineInterpolationMethod;

static const char* const s_shaderVertexTemplate =	"attribute highp vec4 a_position;\n"
													"attribute highp vec4 a_color;\n"
													"varying highp vec4 v_color;\n"
													"uniform highp float u_pointSize;\n"
													"void main ()\n"
													"{\n"
													"	gl_Position = a_position;\n"
													"	gl_PointSize = u_pointSize;\n"
													"	v_color = a_color;\n"
													"}\n";
static const char* const s_shaderFragmentTemplate =	"varying mediump vec4 v_color;\n"
													"void main ()\n"
													"{\n"
													"	gl_FragColor = v_color;\n"
													"}\n";
enum InterpolationCaseFlags
{
	INTERPOLATIONFLAGS_NONE = 0,
	INTERPOLATIONFLAGS_PROJECTED = (1 << 1),
};

enum PrimitiveWideness
{
	PRIMITIVEWIDENESS_NARROW = 0,
	PRIMITIVEWIDENESS_WIDE,

	PRIMITIVEWIDENESS_LAST
};

class BaseRenderingCase : public TestCase
{
public:
							BaseRenderingCase	(Context& context, const char* name, const char* desc, int renderSize = 256);
							~BaseRenderingCase	(void);
	virtual void			init				(void);
	void					deinit				(void);

protected:
	void					drawPrimitives		(tcu::Surface& result, const std::vector<tcu::Vec4>& vertexData, glw::GLenum primitiveType);
	void					drawPrimitives		(tcu::Surface& result, const std::vector<tcu::Vec4>& vertexData, const std::vector<tcu::Vec4>& coloDrata, glw::GLenum primitiveType);

	const int				m_renderSize;
	int						m_numSamples;
	int						m_subpixelBits;
	float					m_pointSize;
	float					m_lineWidth;

	glu::ShaderProgram*		m_shader;
};

BaseRenderingCase::BaseRenderingCase (Context& context, const char* name, const char* desc, int renderSize)
	: TestCase				(context, name, desc)
	, m_renderSize			(renderSize)
	, m_numSamples			(-1)
	, m_subpixelBits		(-1)
	, m_pointSize			(1.0f)
	, m_lineWidth			(1.0f)
	, m_shader				(DE_NULL)
{
}

BaseRenderingCase::~BaseRenderingCase (void)
{
	deinit();
}

void BaseRenderingCase::init (void)
{
	const int width	 = m_context.getRenderTarget().getWidth();
	const int height = m_context.getRenderTarget().getHeight();

	// Requirements

	if (width < m_renderSize || height < m_renderSize)
		throw tcu::NotSupportedError(std::string("Render target size must be at least ") + de::toString(m_renderSize) + "x" + de::toString(m_renderSize));

	if (m_lineWidth != 1.0f)
	{
		float range[2] = { 0.0f, 0.0f };
		m_context.getRenderContext().getFunctions().getFloatv(GL_ALIASED_LINE_WIDTH_RANGE, range);

		if (m_lineWidth < range[0] || m_lineWidth > range[1])
			throw tcu::NotSupportedError(std::string("Support for line width ") + de::toString(m_lineWidth) + " is required.");

		m_testCtx.getLog() << tcu::TestLog::Message << "ALIASED_LINE_WIDTH_RANGE = [" << range[0] << ", " << range[1] << "]" << tcu::TestLog::EndMessage;
	}

	if (m_pointSize != 1.0f)
	{
		float range[2] = { 0.0f, 0.0f };
		m_context.getRenderContext().getFunctions().getFloatv(GL_ALIASED_POINT_SIZE_RANGE, range);

		if (m_pointSize < range[0] || m_pointSize > range[1])
			throw tcu::NotSupportedError(std::string("Support for point size ") + de::toString(m_pointSize) + " is required.");

		m_testCtx.getLog() << tcu::TestLog::Message << "ALIASED_POINT_SIZE_RANGE = [" << range[0] << ", " << range[1] << "]" << tcu::TestLog::EndMessage;
	}

	// Query info

	m_numSamples = m_context.getRenderTarget().getNumSamples();
	m_context.getRenderContext().getFunctions().getIntegerv(GL_SUBPIXEL_BITS, &m_subpixelBits);

	m_testCtx.getLog() << tcu::TestLog::Message << "Sample count = " << m_numSamples << tcu::TestLog::EndMessage;
	m_testCtx.getLog() << tcu::TestLog::Message << "SUBPIXEL_BITS = " << m_subpixelBits << tcu::TestLog::EndMessage;

	// Gen shader

	{
		tcu::StringTemplate					vertexSource	(s_shaderVertexTemplate);
		tcu::StringTemplate					fragmentSource	(s_shaderFragmentTemplate);
		std::map<std::string, std::string>	params;

		m_shader = new glu::ShaderProgram(m_context.getRenderContext(), glu::ProgramSources() << glu::VertexSource(vertexSource.specialize(params)) << glu::FragmentSource(fragmentSource.specialize(params)));
		if (!m_shader->isOk())
			throw tcu::TestError("could not create shader");
	}
}

void BaseRenderingCase::deinit (void)
{
	if (m_shader)
	{
		delete m_shader;
		m_shader = DE_NULL;
	}
}

void BaseRenderingCase::drawPrimitives (tcu::Surface& result, const std::vector<tcu::Vec4>& vertexData, glw::GLenum primitiveType)
{
	// default to color white
	const std::vector<tcu::Vec4> colorData(vertexData.size(), tcu::Vec4(1.0f, 1.0f, 1.0f, 1.0f));

	drawPrimitives(result, vertexData, colorData, primitiveType);
}

void BaseRenderingCase::drawPrimitives (tcu::Surface& result, const std::vector<tcu::Vec4>& vertexData, const std::vector<tcu::Vec4>& colorData, glw::GLenum primitiveType)
{
	const glw::Functions&	gl				= m_context.getRenderContext().getFunctions();
	const glw::GLint		positionLoc		= gl.getAttribLocation(m_shader->getProgram(), "a_position");
	const glw::GLint		colorLoc		= gl.getAttribLocation(m_shader->getProgram(), "a_color");
	const glw::GLint		pointSizeLoc	= gl.getUniformLocation(m_shader->getProgram(), "u_pointSize");

	gl.clearColor					(0, 0, 0, 1);
	gl.clear						(GL_COLOR_BUFFER_BIT);
	gl.viewport						(0, 0, m_renderSize, m_renderSize);
	gl.useProgram					(m_shader->getProgram());
	gl.enableVertexAttribArray		(positionLoc);
	gl.vertexAttribPointer			(positionLoc, 4, GL_FLOAT, GL_FALSE, 0, &vertexData[0]);
	gl.enableVertexAttribArray		(colorLoc);
	gl.vertexAttribPointer			(colorLoc, 4, GL_FLOAT, GL_FALSE, 0, &colorData[0]);
	gl.uniform1f					(pointSizeLoc, m_pointSize);
	gl.lineWidth					(m_lineWidth);
	gl.drawArrays					(primitiveType, 0, (glw::GLsizei)vertexData.size());
	gl.disableVertexAttribArray		(colorLoc);
	gl.disableVertexAttribArray		(positionLoc);
	gl.useProgram					(0);
	gl.finish						();
	GLU_EXPECT_NO_ERROR				(gl.getError(), "draw primitives");

	glu::readPixels(m_context.getRenderContext(), 0, 0, result.getAccess());
}

class BaseTriangleCase : public BaseRenderingCase
{
public:
							BaseTriangleCase	(Context& context, const char* name, const char* desc, glw::GLenum primitiveDrawType);
							~BaseTriangleCase	(void);
	IterateResult			iterate				(void);

private:
	virtual void			generateTriangles	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles) = DE_NULL;

	int						m_iteration;
	const int				m_iterationCount;
	const glw::GLenum		m_primitiveDrawType;
	bool					m_allIterationsPassed;
};

BaseTriangleCase::BaseTriangleCase (Context& context, const char* name, const char* desc, glw::GLenum primitiveDrawType)
	: BaseRenderingCase		(context, name, desc)
	, m_iteration			(0)
	, m_iterationCount		(3)
	, m_primitiveDrawType	(primitiveDrawType)
	, m_allIterationsPassed	(true)
{
}

BaseTriangleCase::~BaseTriangleCase (void)
{
}

BaseTriangleCase::IterateResult BaseTriangleCase::iterate (void)
{
	const std::string								iterationDescription	= "Test iteration " + de::toString(m_iteration+1) + " / " + de::toString(m_iterationCount);
	const tcu::ScopedLogSection						section					(m_testCtx.getLog(), iterationDescription, iterationDescription);
	tcu::Surface									resultImage				(m_renderSize, m_renderSize);
	std::vector<tcu::Vec4>							drawBuffer;
	std::vector<TriangleSceneSpec::SceneTriangle>	triangles;

	generateTriangles(m_iteration, drawBuffer, triangles);

	// draw image
	drawPrimitives(resultImage, drawBuffer, m_primitiveDrawType);

	// compare
	{
		bool					compareOk;
		RasterizationArguments	args;
		TriangleSceneSpec		scene;

		args.numSamples		= m_numSamples;
		args.subpixelBits	= m_subpixelBits;
		args.redBits		= m_context.getRenderTarget().getPixelFormat().redBits;
		args.greenBits		= m_context.getRenderTarget().getPixelFormat().greenBits;
		args.blueBits		= m_context.getRenderTarget().getPixelFormat().blueBits;

		scene.triangles.swap(triangles);

		compareOk = verifyTriangleGroupRasterization(resultImage, scene, args, m_testCtx.getLog());

		if (!compareOk)
			m_allIterationsPassed = false;
	}

	// result
	if (++m_iteration == m_iterationCount)
	{
		if (m_allIterationsPassed)
			m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		else
			m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Incorrect rasterization");

		return STOP;
	}
	else
		return CONTINUE;
}

class BaseLineCase : public BaseRenderingCase
{
public:
							BaseLineCase		(Context& context, const char* name, const char* desc, glw::GLenum primitiveDrawType, PrimitiveWideness wideness);
							~BaseLineCase		(void);
	IterateResult			iterate				(void);

private:
	virtual void			generateLines		(int iteration, std::vector<tcu::Vec4>& outData, std::vector<LineSceneSpec::SceneLine>& outLines) = DE_NULL;

	int						m_iteration;
	const int				m_iterationCount;
	const glw::GLenum		m_primitiveDrawType;
	const PrimitiveWideness	m_primitiveWideness;
	bool					m_allIterationsPassed;
	bool					m_multisampleRelaxationRequired;

	static const float		s_wideSize;
};

const float BaseLineCase::s_wideSize = 5.0f;

BaseLineCase::BaseLineCase (Context& context, const char* name, const char* desc, glw::GLenum primitiveDrawType, PrimitiveWideness wideness)
	: BaseRenderingCase					(context, name, desc)
	, m_iteration						(0)
	, m_iterationCount					(3)
	, m_primitiveDrawType				(primitiveDrawType)
	, m_primitiveWideness				(wideness)
	, m_allIterationsPassed				(true)
	, m_multisampleRelaxationRequired	(false)
{
	DE_ASSERT(m_primitiveWideness < PRIMITIVEWIDENESS_LAST);
	m_lineWidth = (m_primitiveWideness == PRIMITIVEWIDENESS_WIDE) ? (s_wideSize) : (1.0f);
}

BaseLineCase::~BaseLineCase (void)
{
}

BaseLineCase::IterateResult BaseLineCase::iterate (void)
{
	const std::string						iterationDescription	= "Test iteration " + de::toString(m_iteration+1) + " / " + de::toString(m_iterationCount);
	const tcu::ScopedLogSection				section					(m_testCtx.getLog(), iterationDescription, iterationDescription);
	tcu::Surface							resultImage				(m_renderSize, m_renderSize);
	std::vector<tcu::Vec4>					drawBuffer;
	std::vector<LineSceneSpec::SceneLine>	lines;

	// last iteration, max out size
	if (m_primitiveWideness == PRIMITIVEWIDENESS_WIDE &&
		m_iteration+1 == m_iterationCount)
	{
		float range[2] = { 0.0f, 0.0f };
		m_context.getRenderContext().getFunctions().getFloatv(GL_ALIASED_LINE_WIDTH_RANGE, range);

		m_lineWidth = range[1];
	}

	// gen data
	generateLines(m_iteration, drawBuffer, lines);

	// draw image
	drawPrimitives(resultImage, drawBuffer, m_primitiveDrawType);

	// compare
	{
		bool					compareOk;
		RasterizationArguments	args;
		LineSceneSpec			scene;

		args.numSamples		= m_numSamples;
		args.subpixelBits	= m_subpixelBits;
		args.redBits		= m_context.getRenderTarget().getPixelFormat().redBits;
		args.greenBits		= m_context.getRenderTarget().getPixelFormat().greenBits;
		args.blueBits		= m_context.getRenderTarget().getPixelFormat().blueBits;

		scene.lines.swap(lines);
		scene.lineWidth = m_lineWidth;
		scene.stippleFactor = 1;
		scene.stipplePattern = 0xFFFF;
		scene.allowNonProjectedInterpolation = true;

		compareOk = verifyLineGroupRasterization(resultImage, scene, args, m_testCtx.getLog());

		// multisampled wide lines might not be supported
		if (scene.lineWidth != 1.0f && m_numSamples > 1 && !compareOk)
		{
			m_multisampleRelaxationRequired = true;
			compareOk = true;
		}

		if (!compareOk)
			m_allIterationsPassed = false;
	}

	// result
	if (++m_iteration == m_iterationCount)
	{
		if (m_allIterationsPassed && m_multisampleRelaxationRequired)
			m_testCtx.setTestResult(QP_TEST_RESULT_COMPATIBILITY_WARNING, "Rasterization of multisampled wide lines failed");
		else if (m_allIterationsPassed)
			m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		else
			m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Incorrect rasterization");

		return STOP;
	}
	else
		return CONTINUE;
}

class PointCase : public BaseRenderingCase
{
public:
							PointCase		(Context& context, const char* name, const char* desc, PrimitiveWideness wideness);
							~PointCase		(void);
	IterateResult			iterate			(void);

private:
	void					generatePoints	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<PointSceneSpec::ScenePoint>& outPoints);

	int						m_iteration;
	const int				m_iterationCount;
	const PrimitiveWideness	m_primitiveWideness;
	bool					m_allIterationsPassed;

	static const float		s_wideSize;
};

const float PointCase::s_wideSize = 10.0f;

PointCase::PointCase (Context& context, const char* name, const char* desc, PrimitiveWideness wideness)
	: BaseRenderingCase		(context, name, desc)
	, m_iteration			(0)
	, m_iterationCount		(3)
	, m_primitiveWideness	(wideness)
	, m_allIterationsPassed	(true)
{
	m_pointSize = (m_primitiveWideness == PRIMITIVEWIDENESS_WIDE) ? (s_wideSize) : (1.0f);
}

PointCase::~PointCase (void)
{
}

PointCase::IterateResult PointCase::iterate (void)
{
	const std::string						iterationDescription	= "Test iteration " + de::toString(m_iteration+1) + " / " + de::toString(m_iterationCount);
	const tcu::ScopedLogSection				section					(m_testCtx.getLog(), iterationDescription, iterationDescription);
	tcu::Surface							resultImage				(m_renderSize, m_renderSize);
	std::vector<tcu::Vec4>					drawBuffer;
	std::vector<PointSceneSpec::ScenePoint>	points;

	// last iteration, max out size
	if (m_primitiveWideness == PRIMITIVEWIDENESS_WIDE &&
		m_iteration+1 == m_iterationCount)
	{
		float range[2] = { 0.0f, 0.0f };
		m_context.getRenderContext().getFunctions().getFloatv(GL_ALIASED_POINT_SIZE_RANGE, range);

		m_pointSize = range[1];
	}

	// gen data
	generatePoints(m_iteration, drawBuffer, points);

	// draw image
	drawPrimitives(resultImage, drawBuffer, GL_POINTS);

	// compare
	{
		bool					compareOk;
		RasterizationArguments	args;
		PointSceneSpec			scene;

		args.numSamples		= m_numSamples;
		args.subpixelBits	= m_subpixelBits;
		args.redBits		= m_context.getRenderTarget().getPixelFormat().redBits;
		args.greenBits		= m_context.getRenderTarget().getPixelFormat().greenBits;
		args.blueBits		= m_context.getRenderTarget().getPixelFormat().blueBits;

		scene.points.swap(points);

		compareOk = verifyPointGroupRasterization(resultImage, scene, args, m_testCtx.getLog());

		if (!compareOk)
			m_allIterationsPassed = false;
	}

	// result
	if (++m_iteration == m_iterationCount)
	{
		if (m_allIterationsPassed)
			m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		else
			m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Incorrect rasterization");

		return STOP;
	}
	else
		return CONTINUE;
}

void PointCase::generatePoints	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<PointSceneSpec::ScenePoint>& outPoints)
{
	outData.resize(6);

	switch (iteration)
	{
		case 0:
			// \note: these values are chosen arbitrarily
			outData[0] = tcu::Vec4( 0.2f,  0.8f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4( 0.5f,  0.2f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4( 0.5f,  0.3f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.5f,  0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(-0.2f, -0.4f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4(-0.4f,  0.2f, 0.0f, 1.0f);
			break;

		case 1:
			outData[0] = tcu::Vec4(-0.499f, 0.128f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(-0.501f,  -0.3f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.11f,  -0.2f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(  0.11f,   0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(  0.88f,   0.9f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4(   0.4f,   1.2f, 0.0f, 1.0f);
			break;

		case 2:
			outData[0] = tcu::Vec4( -0.9f, -0.3f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(  0.3f, -0.9f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4( -0.4f, -0.1f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.11f,  0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4( 0.88f,  0.7f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4( -0.4f,  0.4f, 0.0f, 1.0f);
			break;
	}

	outPoints.resize(outData.size());
	for (int pointNdx = 0; pointNdx < (int)outPoints.size(); ++pointNdx)
	{
		outPoints[pointNdx].position = outData[pointNdx];
		outPoints[pointNdx].pointSize = m_pointSize;
	}

	// log
	m_testCtx.getLog() << tcu::TestLog::Message << "Rendering " << outPoints.size() << " point(s): (point size = " << m_pointSize << ")" << tcu::TestLog::EndMessage;
	for (int pointNdx = 0; pointNdx < (int)outPoints.size(); ++pointNdx)
		m_testCtx.getLog() << tcu::TestLog::Message << "Point " << (pointNdx+1) << ":\t" << outPoints[pointNdx].position << tcu::TestLog::EndMessage;
}

class PointSizeClampedTest : public BaseRenderingCase
{
public:
	PointSizeClampedTest (Context& context, const char* name, const char* desc)
		: BaseRenderingCase	(context, name, desc)
	{
	}

	IterateResult iterate ()
	{
		m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		const glw::Functions& gl = m_context.getRenderContext().getFunctions();

		// Tests that point sizes (written to gl_PointSize) are clamped,
		// before rasterization, to the ALIASED_POINT_SIZE_RANGE
		// given by the implementation.
		static const int fboHeight = 4;
		static const int testAreaWidth = 4;
		static const int testAreaWidthWithMargin = testAreaWidth + 4;
		static const float pointRadiusOverage = 8;
		int fboWidth = 0;
		int maxPointDiameter = 0;
		{
			int maxRenderbufferSize = 0;
			int maxViewportDims[2] = {};
			gl.getIntegerv(GL_MAX_RENDERBUFFER_SIZE, &maxRenderbufferSize);
			gl.getIntegerv(GL_MAX_VIEWPORT_DIMS, maxViewportDims);
			int maxFboWidth = std::min(maxRenderbufferSize, maxViewportDims[0]);

			float pointSizeRange[2] = {};
			gl.getFloatv(GL_ALIASED_POINT_SIZE_RANGE, pointSizeRange);
			m_testCtx.getLog() << tcu::TestLog::Message
				<< "GL_ALIASED_POINT_SIZE_RANGE is [" << pointSizeRange[0] << ", " << pointSizeRange[1] << "]"
				<< tcu::TestLog::EndMessage;
			// Typically (in the correct case), maxPointDiameter is an odd integer.
			maxPointDiameter = (int) pointSizeRange[1];
			// maxPointRadius is inclusive of the center point.
			int maxPointRadius = (maxPointDiameter + 1) / 2;
			if (maxPointRadius > maxFboWidth - testAreaWidthWithMargin)
			{
				m_testCtx.setTestResult(QP_TEST_RESULT_COMPATIBILITY_WARNING, "max framebuffer size isn't large enough to test max point size");
				return STOP;
			}
			fboWidth = maxPointRadius + testAreaWidthWithMargin;
			// Round up to the nearest multiple of 2:
			fboWidth = ((fboWidth + 1) / 2) * 2;
		}
		float pointSize = ((float) maxPointDiameter) + pointRadiusOverage * 2;
		TCU_CHECK(gl.getError() == GL_NO_ERROR);

		m_testCtx.getLog() << tcu::TestLog::Message
			<< "Testing with pointSize = " << pointSize
			<< ", fboWidth = " << fboWidth
			<< tcu::TestLog::EndMessage;

		// Create a framebuffer that is (fboWidth)x(fboHeight), cleared to green:
		// +---------------------------+
		// |ggggggggggggggggggggggggggg|
		// +---------------------------+
		gl.viewport(0, 0, fboWidth, fboHeight);
		deUint32 fbo = 0;
		gl.genFramebuffers(1, &fbo);
		gl.bindFramebuffer(GL_FRAMEBUFFER, fbo);
		deUint32 rbo = 0;
		gl.genRenderbuffers(1, &rbo);
		gl.bindRenderbuffer(GL_RENDERBUFFER, rbo);
		gl.renderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, fboWidth, fboHeight);
		gl.framebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);
		if (gl.checkFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
		{
			m_testCtx.setTestResult(QP_TEST_RESULT_COMPATIBILITY_WARNING, "couldn't complete a framebuffer suitable to test max point size");
			return STOP;
		}
		gl.clearColor(0.0f, 1.0f, 0.0f, 1.0f);
		gl.clear(GL_COLOR_BUFFER_BIT);
		TCU_CHECK(gl.getError() == GL_NO_ERROR);

		// (Framebuffer is still bound.)

		// Draw a red point, with size pointSize, at the far right:
		// +---------------------------+
		// |ggggggggRRRRRRRRRRRRRRRRRRR|
		// +---------------------------+
		//                            x                           point center
		//  ^^^^^^^^^^^^^^^^^^^^^^^^^^^                           fboWidth
		//  ^^^^                                                  testAreaWidth = 4 (this is the area that's tested)
		//  ^^^^^^^^                                              testAreaWidthWithMargin = 8 (extra 4 pixels for tolerance)
		//          ^^^^^^^^^^^^^^^^^^x^^^^^^^^^^^^^^^^^^         maxPointDiameter = 37
		//  ^^^^^^^^                                     ^^^^^^^^ pointRadiusOverage = 8 * 2
		//  ^^^^^^^^^^^^^^^^^^^^^^^^^^x^^^^^^^^^^^^^^^^^^^^^^^^^^ pointSize = 53
		//          ^^^^^^^^^^^^^^^^^^^ area of resulting draw, if the size is clamped properly = 19
		{
			const glw::GLint		positionLoc		= gl.getAttribLocation(m_shader->getProgram(), "a_position");
			const glw::GLint		colorLoc		= gl.getAttribLocation(m_shader->getProgram(), "a_color");
			const glw::GLint		pointSizeLoc	= gl.getUniformLocation(m_shader->getProgram(), "u_pointSize");
			static const float position[] = {1.0f, 0.0f, 0.0f, 1.0f};
			static const float color[] = {1.0f, 0.0f, 0.0f, 1.0f};
			gl.useProgram(m_shader->getProgram());
			gl.enableVertexAttribArray(positionLoc);
			gl.vertexAttribPointer(positionLoc, 4, GL_FLOAT, GL_FALSE, 0, position);
			gl.enableVertexAttribArray(colorLoc);
			gl.vertexAttribPointer(colorLoc, 4, GL_FLOAT, GL_FALSE, 0, color);
			gl.uniform1f(pointSizeLoc, pointSize);
			gl.drawArrays(GL_POINTS, 0, 1);
			gl.disableVertexAttribArray(colorLoc);
			gl.disableVertexAttribArray(positionLoc);
			gl.useProgram(0);
			TCU_CHECK(gl.getError() == GL_NO_ERROR);
		}

		// And test the resulting draw (the test area should still be green).
		deUint32 pixels[testAreaWidth * fboHeight] = {};
		gl.readPixels(0, 0, testAreaWidth, fboHeight, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
		TCU_CHECK(gl.getError() == GL_NO_ERROR);

		const tcu::RGBA threshold(12, 12, 12, 12);
		for (deUint32 y = 0; y < fboHeight; ++y)
		{
			for (deUint32 x = 0; x < testAreaWidth; ++x)
			{
				tcu::RGBA color(pixels[y * testAreaWidth + x]);
				TCU_CHECK(compareThreshold(color, tcu::RGBA::green(), threshold));
			}
		}

		return STOP;
	}
};

class TrianglesCase : public BaseTriangleCase
{
public:
			TrianglesCase		(Context& context, const char* name, const char* desc);
			~TrianglesCase		(void);

	void	generateTriangles	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles);
};

TrianglesCase::TrianglesCase (Context& context, const char* name, const char* desc)
	: BaseTriangleCase(context, name, desc, GL_TRIANGLES)
{
}

TrianglesCase::~TrianglesCase (void)
{

}

void TrianglesCase::generateTriangles (int iteration, std::vector<tcu::Vec4>& outData, std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles)
{
	outData.resize(6);

	switch (iteration)
	{
		case 0:
			// \note: these values are chosen arbitrarily
			outData[0] = tcu::Vec4( 0.2f,  0.8f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4( 0.5f,  0.2f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4( 0.5f,  0.3f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.5f,  0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(-1.5f, -0.4f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4(-0.4f,  0.2f, 0.0f, 1.0f);
			break;

		case 1:
			outData[0] = tcu::Vec4(-0.499f, 0.128f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(-0.501f,  -0.3f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.11f,  -0.2f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(  0.11f,   0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(  0.88f,   0.9f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4(   0.4f,   1.2f, 0.0f, 1.0f);
			break;

		case 2:
			outData[0] = tcu::Vec4( -0.9f, -0.3f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(  1.1f, -0.9f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4( -1.1f, -0.1f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.11f,  0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4( 0.88f,  0.7f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4( -0.4f,  0.4f, 0.0f, 1.0f);
			break;
	}

	outTriangles.resize(2);
	outTriangles[0].positions[0] = outData[0];	outTriangles[0].sharedEdge[0] = false;
	outTriangles[0].positions[1] = outData[1];	outTriangles[0].sharedEdge[1] = false;
	outTriangles[0].positions[2] = outData[2];	outTriangles[0].sharedEdge[2] = false;

	outTriangles[1].positions[0] = outData[3];	outTriangles[1].sharedEdge[0] = false;
	outTriangles[1].positions[1] = outData[4];	outTriangles[1].sharedEdge[1] = false;
	outTriangles[1].positions[2] = outData[5];	outTriangles[1].sharedEdge[2] = false;

	// log
	m_testCtx.getLog() << tcu::TestLog::Message << "Rendering " << outTriangles.size() << " triangle(s):" << tcu::TestLog::EndMessage;
	for (int triangleNdx = 0; triangleNdx < (int)outTriangles.size(); ++triangleNdx)
	{
		m_testCtx.getLog()
			<< tcu::TestLog::Message
			<< "Triangle " << (triangleNdx+1) << ":"
			<< "\n\t" << outTriangles[triangleNdx].positions[0]
			<< "\n\t" << outTriangles[triangleNdx].positions[1]
			<< "\n\t" << outTriangles[triangleNdx].positions[2]
			<< tcu::TestLog::EndMessage;
	}
}

class TriangleStripCase : public BaseTriangleCase
{
public:
			TriangleStripCase	(Context& context, const char* name, const char* desc);

	void	generateTriangles	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles);
};

TriangleStripCase::TriangleStripCase (Context& context, const char* name, const char* desc)
	: BaseTriangleCase(context, name, desc, GL_TRIANGLE_STRIP)
{
}

void TriangleStripCase::generateTriangles (int iteration, std::vector<tcu::Vec4>& outData, std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles)
{
	outData.resize(5);

	switch (iteration)
	{
		case 0:
			// \note: these values are chosen arbitrarily
			outData[0] = tcu::Vec4(-0.504f,  0.8f,   0.0f, 1.0f);
			outData[1] = tcu::Vec4(-0.2f,   -0.2f,   0.0f, 1.0f);
			outData[2] = tcu::Vec4(-0.2f,    0.199f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4( 0.5f,    0.201f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4( 1.5f,    0.4f,   0.0f, 1.0f);
			break;

		case 1:
			outData[0] = tcu::Vec4(-0.499f, 0.129f,  0.0f, 1.0f);
			outData[1] = tcu::Vec4(-0.501f,  -0.3f,  0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.11f,  -0.2f,  0.0f, 1.0f);
			outData[3] = tcu::Vec4(  0.11f,  -0.31f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(  0.88f,   0.9f,  0.0f, 1.0f);
			break;

		case 2:
			outData[0] = tcu::Vec4( -0.9f, -0.3f,  0.0f, 1.0f);
			outData[1] = tcu::Vec4(  1.1f, -0.9f,  0.0f, 1.0f);
			outData[2] = tcu::Vec4(-0.87f, -0.1f,  0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.11f,  0.19f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4( 0.88f,  0.7f,  0.0f, 1.0f);
			break;
	}

	outTriangles.resize(3);
	outTriangles[0].positions[0] = outData[0];	outTriangles[0].sharedEdge[0] = false;
	outTriangles[0].positions[1] = outData[1];	outTriangles[0].sharedEdge[1] = true;
	outTriangles[0].positions[2] = outData[2];	outTriangles[0].sharedEdge[2] = false;

	outTriangles[1].positions[0] = outData[2];	outTriangles[1].sharedEdge[0] = true;
	outTriangles[1].positions[1] = outData[1];	outTriangles[1].sharedEdge[1] = false;
	outTriangles[1].positions[2] = outData[3];	outTriangles[1].sharedEdge[2] = true;

	outTriangles[2].positions[0] = outData[2];	outTriangles[2].sharedEdge[0] = true;
	outTriangles[2].positions[1] = outData[3];	outTriangles[2].sharedEdge[1] = false;
	outTriangles[2].positions[2] = outData[4];	outTriangles[2].sharedEdge[2] = false;

	// log
	m_testCtx.getLog() << tcu::TestLog::Message << "Rendering triangle strip, " << outData.size() << " vertices." << tcu::TestLog::EndMessage;
	for (int vtxNdx = 0; vtxNdx < (int)outData.size(); ++vtxNdx)
	{
		m_testCtx.getLog()
			<< tcu::TestLog::Message
			<< "\t" << outData[vtxNdx]
			<< tcu::TestLog::EndMessage;
	}
}

class TriangleFanCase : public BaseTriangleCase
{
public:
			TriangleFanCase		(Context& context, const char* name, const char* desc);

	void	generateTriangles	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles);
};

TriangleFanCase::TriangleFanCase (Context& context, const char* name, const char* desc)
	: BaseTriangleCase(context, name, desc, GL_TRIANGLE_FAN)
{
}

void TriangleFanCase::generateTriangles (int iteration, std::vector<tcu::Vec4>& outData, std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles)
{
	outData.resize(5);

	switch (iteration)
	{
		case 0:
			// \note: these values are chosen arbitrarily
			outData[0] = tcu::Vec4( 0.01f,  0.0f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4( 0.5f,   0.2f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4( 0.46f,  0.3f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.5f,   0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(-1.5f,  -0.4f, 0.0f, 1.0f);
			break;

		case 1:
			outData[0] = tcu::Vec4(-0.499f, 0.128f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(-0.501f,  -0.3f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.11f,  -0.2f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(  0.11f,   0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(  0.88f,   0.9f, 0.0f, 1.0f);
			break;

		case 2:
			outData[0] = tcu::Vec4( -0.9f, -0.3f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(  1.1f, -0.9f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.7f, -0.1f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4( 0.11f,  0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4( 0.88f,  0.7f, 0.0f, 1.0f);
			break;
	}

	outTriangles.resize(3);
	outTriangles[0].positions[0] = outData[0];	outTriangles[0].sharedEdge[0] = false;
	outTriangles[0].positions[1] = outData[1];	outTriangles[0].sharedEdge[1] = false;
	outTriangles[0].positions[2] = outData[2];	outTriangles[0].sharedEdge[2] = true;

	outTriangles[1].positions[0] = outData[0];	outTriangles[1].sharedEdge[0] = true;
	outTriangles[1].positions[1] = outData[2];	outTriangles[1].sharedEdge[1] = false;
	outTriangles[1].positions[2] = outData[3];	outTriangles[1].sharedEdge[2] = true;

	outTriangles[2].positions[0] = outData[0];	outTriangles[2].sharedEdge[0] = true;
	outTriangles[2].positions[1] = outData[3];	outTriangles[2].sharedEdge[1] = false;
	outTriangles[2].positions[2] = outData[4];	outTriangles[2].sharedEdge[2] = false;

	// log
	m_testCtx.getLog() << tcu::TestLog::Message << "Rendering triangle fan, " << outData.size() << " vertices." << tcu::TestLog::EndMessage;
	for (int vtxNdx = 0; vtxNdx < (int)outData.size(); ++vtxNdx)
	{
		m_testCtx.getLog()
			<< tcu::TestLog::Message
			<< "\t" << outData[vtxNdx]
			<< tcu::TestLog::EndMessage;
	}
}

class LinesCase : public BaseLineCase
{
public:
			LinesCase		(Context& context, const char* name, const char* desc, PrimitiveWideness wideness);

	void	generateLines	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<LineSceneSpec::SceneLine>& outLines);
};

LinesCase::LinesCase (Context& context, const char* name, const char* desc, PrimitiveWideness wideness)
	: BaseLineCase(context, name, desc, GL_LINES, wideness)
{
}

void LinesCase::generateLines (int iteration, std::vector<tcu::Vec4>& outData, std::vector<LineSceneSpec::SceneLine>& outLines)
{
	outData.resize(6);

	switch (iteration)
	{
		case 0:
			// \note: these values are chosen arbitrarily
			outData[0] = tcu::Vec4( 0.01f,  0.0f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4( 0.5f,   0.2f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4( 0.46f,  0.3f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.3f,   0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(-1.5f,  -0.4f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4( 0.1f,   0.5f, 0.0f, 1.0f);
			break;

		case 1:
			outData[0] = tcu::Vec4(-0.499f, 0.128f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(-0.501f,  -0.3f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.11f,  -0.2f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(  0.11f,   0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4(  0.88f,   0.9f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4(  0.18f,  -0.2f, 0.0f, 1.0f);
			break;

		case 2:
			outData[0] = tcu::Vec4( -0.9f, -0.3f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(  1.1f, -0.9f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.7f, -0.1f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4( 0.11f,  0.2f, 0.0f, 1.0f);
			outData[4] = tcu::Vec4( 0.88f,  0.7f, 0.0f, 1.0f);
			outData[5] = tcu::Vec4(  0.8f, -0.7f, 0.0f, 1.0f);
			break;
	}

	outLines.resize(3);
	outLines[0].positions[0] = outData[0];
	outLines[0].positions[1] = outData[1];
	outLines[1].positions[0] = outData[2];
	outLines[1].positions[1] = outData[3];
	outLines[2].positions[0] = outData[4];
	outLines[2].positions[1] = outData[5];

	// log
	m_testCtx.getLog() << tcu::TestLog::Message << "Rendering " << outLines.size() << " lines(s): (width = " << m_lineWidth << ")" << tcu::TestLog::EndMessage;
	for (int lineNdx = 0; lineNdx < (int)outLines.size(); ++lineNdx)
	{
		m_testCtx.getLog()
			<< tcu::TestLog::Message
			<< "Line " << (lineNdx+1) << ":"
			<< "\n\t" << outLines[lineNdx].positions[0]
			<< "\n\t" << outLines[lineNdx].positions[1]
			<< tcu::TestLog::EndMessage;
	}
}

class LineStripCase : public BaseLineCase
{
public:
			LineStripCase	(Context& context, const char* name, const char* desc, PrimitiveWideness wideness);

	void	generateLines	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<LineSceneSpec::SceneLine>& outLines);
};

LineStripCase::LineStripCase (Context& context, const char* name, const char* desc, PrimitiveWideness wideness)
	: BaseLineCase(context, name, desc, GL_LINE_STRIP, wideness)
{
}

void LineStripCase::generateLines (int iteration, std::vector<tcu::Vec4>& outData, std::vector<LineSceneSpec::SceneLine>& outLines)
{
	outData.resize(4);

	switch (iteration)
	{
		case 0:
			// \note: these values are chosen arbitrarily
			outData[0] = tcu::Vec4( 0.01f,  0.0f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4( 0.5f,   0.2f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4( 0.46f,  0.3f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.5f,   0.2f, 0.0f, 1.0f);
			break;

		case 1:
			outData[0] = tcu::Vec4(-0.499f, 0.128f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(-0.501f,  -0.3f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.11f,  -0.2f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(  0.11f,   0.2f, 0.0f, 1.0f);
			break;

		case 2:
			outData[0] = tcu::Vec4( -0.9f, -0.3f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(  1.1f, -0.9f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.7f, -0.1f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4( 0.11f,  0.2f, 0.0f, 1.0f);
			break;
	}

	outLines.resize(3);
	outLines[0].positions[0] = outData[0];
	outLines[0].positions[1] = outData[1];
	outLines[1].positions[0] = outData[1];
	outLines[1].positions[1] = outData[2];
	outLines[2].positions[0] = outData[2];
	outLines[2].positions[1] = outData[3];

	// log
	m_testCtx.getLog() << tcu::TestLog::Message << "Rendering line strip, width = " << m_lineWidth << ", " << outData.size() << " vertices." << tcu::TestLog::EndMessage;
	for (int vtxNdx = 0; vtxNdx < (int)outData.size(); ++vtxNdx)
	{
		m_testCtx.getLog()
			<< tcu::TestLog::Message
			<< "\t" << outData[vtxNdx]
			<< tcu::TestLog::EndMessage;
	}
}

class LineLoopCase : public BaseLineCase
{
public:
			LineLoopCase	(Context& context, const char* name, const char* desc, PrimitiveWideness wideness);

	void	generateLines	(int iteration, std::vector<tcu::Vec4>& outData, std::vector<LineSceneSpec::SceneLine>& outLines);
};

LineLoopCase::LineLoopCase (Context& context, const char* name, const char* desc, PrimitiveWideness wideness)
	: BaseLineCase(context, name, desc, GL_LINE_LOOP, wideness)
{
}

void LineLoopCase::generateLines (int iteration, std::vector<tcu::Vec4>& outData, std::vector<LineSceneSpec::SceneLine>& outLines)
{
	outData.resize(4);

	switch (iteration)
	{
		case 0:
			// \note: these values are chosen arbitrarily
			outData[0] = tcu::Vec4( 0.01f,  0.0f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4( 0.5f,   0.2f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4( 0.46f,  0.3f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(-0.5f,   0.2f, 0.0f, 1.0f);
			break;

		case 1:
			outData[0] = tcu::Vec4(-0.499f, 0.128f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(-0.501f,  -0.3f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.11f,  -0.2f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4(  0.11f,   0.2f, 0.0f, 1.0f);
			break;

		case 2:
			outData[0] = tcu::Vec4( -0.9f, -0.3f, 0.0f, 1.0f);
			outData[1] = tcu::Vec4(  1.1f, -0.9f, 0.0f, 1.0f);
			outData[2] = tcu::Vec4(  0.7f, -0.1f, 0.0f, 1.0f);
			outData[3] = tcu::Vec4( 0.11f,  0.2f, 0.0f, 1.0f);
			break;
	}

	outLines.resize(4);
	outLines[0].positions[0] = outData[0];
	outLines[0].positions[1] = outData[1];
	outLines[1].positions[0] = outData[1];
	outLines[1].positions[1] = outData[2];
	outLines[2].positions[0] = outData[2];
	outLines[2].positions[1] = outData[3];
	outLines[3].positions[0] = outData[3];
	outLines[3].positions[1] = outData[0];

	// log
	m_testCtx.getLog() << tcu::TestLog::Message << "Rendering line loop, width = " << m_lineWidth << ", " << outData.size() << " vertices." << tcu::TestLog::EndMessage;
	for (int vtxNdx = 0; vtxNdx < (int)outData.size(); ++vtxNdx)
	{
		m_testCtx.getLog()
			<< tcu::TestLog::Message
			<< "\t" << outData[vtxNdx]
			<< tcu::TestLog::EndMessage;
	}
}

class FillRuleCase : public BaseRenderingCase
{
public:
	enum FillRuleCaseType
	{
		FILLRULECASE_BASIC = 0,
		FILLRULECASE_REVERSED,
		FILLRULECASE_CLIPPED_FULL,
		FILLRULECASE_CLIPPED_PARTIAL,
		FILLRULECASE_PROJECTED,

		FILLRULECASE_LAST
	};

							FillRuleCase		(Context& ctx, const char* name, const char* desc, FillRuleCaseType type);
							~FillRuleCase		(void);
	IterateResult			iterate				(void);

private:
	int						getRenderSize		(FillRuleCase::FillRuleCaseType type) const;
	int						getNumIterations	(FillRuleCase::FillRuleCaseType type) const;
	void					generateTriangles	(int iteration, std::vector<tcu::Vec4>& outData) const;

	const FillRuleCaseType	m_caseType;
	int						m_iteration;
	const int				m_iterationCount;
	bool					m_allIterationsPassed;

};

FillRuleCase::FillRuleCase (Context& ctx, const char* name, const char* desc, FillRuleCaseType type)
	: BaseRenderingCase		(ctx, name, desc, getRenderSize(type))
	, m_caseType			(type)
	, m_iteration			(0)
	, m_iterationCount		(getNumIterations(type))
	, m_allIterationsPassed	(true)
{
	DE_ASSERT(type < FILLRULECASE_LAST);
}

FillRuleCase::~FillRuleCase (void)
{
	deinit();
}

FillRuleCase::IterateResult FillRuleCase::iterate (void)
{
	const std::string						iterationDescription	= "Test iteration " + de::toString(m_iteration+1) + " / " + de::toString(m_iterationCount);
	const tcu::ScopedLogSection				section					(m_testCtx.getLog(), iterationDescription, iterationDescription);
	const int								thresholdRed			= 1 << (8 - m_context.getRenderTarget().getPixelFormat().redBits);
	const int								thresholdGreen			= 1 << (8 - m_context.getRenderTarget().getPixelFormat().greenBits);
	const int								thresholdBlue			= 1 << (8 - m_context.getRenderTarget().getPixelFormat().blueBits);
	tcu::Surface							resultImage				(m_renderSize, m_renderSize);
	std::vector<tcu::Vec4>					drawBuffer;
	bool									imageShown				= false;

	generateTriangles(m_iteration, drawBuffer);

	// draw image
	{
		const glw::Functions&			gl				= m_context.getRenderContext().getFunctions();
		const std::vector<tcu::Vec4>	colorBuffer		(drawBuffer.size(), tcu::Vec4(0.5f, 0.5f, 0.5f, 1.0f));

		m_testCtx.getLog() << tcu::TestLog::Message << "Drawing gray triangles with shared edges.\nEnabling additive blending to detect overlapping fragments." << tcu::TestLog::EndMessage;

		gl.enable(GL_BLEND);
		gl.blendEquation(GL_FUNC_ADD);
		gl.blendFunc(GL_ONE, GL_ONE);
		drawPrimitives(resultImage, drawBuffer, colorBuffer, GL_TRIANGLES);
	}

	// verify no overdraw
	{
		const tcu::RGBA	triangleColor	= tcu::RGBA(127, 127, 127, 255);
		bool			overdraw		= false;

		m_testCtx.getLog() << tcu::TestLog::Message << "Verifying result." << tcu::TestLog::EndMessage;

		for (int y = 0; y < resultImage.getHeight(); ++y)
		for (int x = 0; x < resultImage.getWidth();  ++x)
		{
			const tcu::RGBA color = resultImage.getPixel(x, y);

			// color values are greater than triangle color? Allow lower values for multisampled edges and background.
			if ((color.getRed()   - triangleColor.getRed())   > thresholdRed   ||
				(color.getGreen() - triangleColor.getGreen()) > thresholdGreen ||
				(color.getBlue()  - triangleColor.getBlue())  > thresholdBlue)
				overdraw = true;
		}

		// results
		if (!overdraw)
			m_testCtx.getLog() << tcu::TestLog::Message << "No overlapping fragments detected." << tcu::TestLog::EndMessage;
		else
		{
			m_testCtx.getLog()	<< tcu::TestLog::Message << "Overlapping fragments detected, image is not valid." << tcu::TestLog::EndMessage;
			m_testCtx.getLog()	<< tcu::TestLog::ImageSet("Result of rendering", "Result of rendering")
								<< tcu::TestLog::Image("Result", "Result", resultImage)
								<< tcu::TestLog::EndImageSet;

			imageShown = true;
			m_allIterationsPassed = false;
		}
	}

	// verify no missing fragments in the full viewport case
	if (m_caseType == FILLRULECASE_CLIPPED_FULL)
	{
		bool missingFragments = false;

		m_testCtx.getLog() << tcu::TestLog::Message << "Searching missing fragments." << tcu::TestLog::EndMessage;

		for (int y = 0; y < resultImage.getHeight(); ++y)
		for (int x = 0; x < resultImage.getWidth();  ++x)
		{
			const tcu::RGBA color = resultImage.getPixel(x, y);

			// black? (background)
			if (color.getRed()   <= thresholdRed   ||
				color.getGreen() <= thresholdGreen ||
				color.getBlue()  <= thresholdBlue)
				missingFragments = true;
		}

		// results
		if (!missingFragments)
			m_testCtx.getLog() << tcu::TestLog::Message << "No missing fragments detected." << tcu::TestLog::EndMessage;
		else
		{
			m_testCtx.getLog()	<< tcu::TestLog::Message << "Missing fragments detected, image is not valid." << tcu::TestLog::EndMessage;

			if (!imageShown)
			{
				m_testCtx.getLog()	<< tcu::TestLog::ImageSet("Result of rendering", "Result of rendering")
									<< tcu::TestLog::Image("Result", "Result", resultImage)
									<< tcu::TestLog::EndImageSet;
			}

			m_allIterationsPassed = false;
		}
	}

	// result
	if (++m_iteration == m_iterationCount)
	{
		if (m_allIterationsPassed)
			m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		else
			m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Found invalid pixels");

		return STOP;
	}
	else
		return CONTINUE;
}

int FillRuleCase::getRenderSize (FillRuleCase::FillRuleCaseType type) const
{
	if (type == FILLRULECASE_CLIPPED_FULL || type == FILLRULECASE_CLIPPED_PARTIAL)
		return 64;
	else
		return 256;
}

int FillRuleCase::getNumIterations (FillRuleCase::FillRuleCaseType type) const
{
	if (type == FILLRULECASE_CLIPPED_FULL || type == FILLRULECASE_CLIPPED_PARTIAL)
		return 15;
	else
		return 2;
}

void FillRuleCase::generateTriangles (int iteration, std::vector<tcu::Vec4>& outData) const
{
	switch (m_caseType)
	{
		case FILLRULECASE_BASIC:
		case FILLRULECASE_REVERSED:
		case FILLRULECASE_PROJECTED:
		{
			const int	numRows		= 4;
			const int	numColumns	= 4;
			const float	quadSide	= 0.15f;
			de::Random	rnd			(0xabcd);

			outData.resize(6 * numRows * numColumns);

			for (int col = 0; col < numColumns; ++col)
			for (int row = 0; row < numRows;    ++row)
			{
				const tcu::Vec2 center		= tcu::Vec2(((float)row + 0.5f) / (float)numRows * 2.0f - 1.0f, ((float)col + 0.5f) / (float)numColumns * 2.0f - 1.0f);
				const float		rotation	= float(iteration * numColumns * numRows + col * numRows + row) / (float)(m_iterationCount * numColumns * numRows) * DE_PI / 2.0f;
				const tcu::Vec2 sideH		= quadSide * tcu::Vec2(deFloatCos(rotation), deFloatSin(rotation));
				const tcu::Vec2 sideV		= tcu::Vec2(sideH.y(), -sideH.x());
				const tcu::Vec2 quad[4]		=
				{
					center + sideH + sideV,
					center + sideH - sideV,
					center - sideH - sideV,
					center - sideH + sideV,
				};

				if (m_caseType == FILLRULECASE_BASIC)
				{
					outData[6 * (col * numRows + row) + 0] = tcu::Vec4(quad[0].x(), quad[0].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 1] = tcu::Vec4(quad[1].x(), quad[1].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 2] = tcu::Vec4(quad[2].x(), quad[2].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 3] = tcu::Vec4(quad[2].x(), quad[2].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 4] = tcu::Vec4(quad[0].x(), quad[0].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 5] = tcu::Vec4(quad[3].x(), quad[3].y(), 0.0f, 1.0f);
				}
				else if (m_caseType == FILLRULECASE_REVERSED)
				{
					outData[6 * (col * numRows + row) + 0] = tcu::Vec4(quad[0].x(), quad[0].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 1] = tcu::Vec4(quad[1].x(), quad[1].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 2] = tcu::Vec4(quad[2].x(), quad[2].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 3] = tcu::Vec4(quad[0].x(), quad[0].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 4] = tcu::Vec4(quad[2].x(), quad[2].y(), 0.0f, 1.0f);
					outData[6 * (col * numRows + row) + 5] = tcu::Vec4(quad[3].x(), quad[3].y(), 0.0f, 1.0f);
				}
				else if (m_caseType == FILLRULECASE_PROJECTED)
				{
					const float w0 = rnd.getFloat(0.1f, 4.0f);
					const float w1 = rnd.getFloat(0.1f, 4.0f);
					const float w2 = rnd.getFloat(0.1f, 4.0f);
					const float w3 = rnd.getFloat(0.1f, 4.0f);

					outData[6 * (col * numRows + row) + 0] = tcu::Vec4(quad[0].x() * w0, quad[0].y() * w0, 0.0f, w0);
					outData[6 * (col * numRows + row) + 1] = tcu::Vec4(quad[1].x() * w1, quad[1].y() * w1, 0.0f, w1);
					outData[6 * (col * numRows + row) + 2] = tcu::Vec4(quad[2].x() * w2, quad[2].y() * w2, 0.0f, w2);
					outData[6 * (col * numRows + row) + 3] = tcu::Vec4(quad[2].x() * w2, quad[2].y() * w2, 0.0f, w2);
					outData[6 * (col * numRows + row) + 4] = tcu::Vec4(quad[0].x() * w0, quad[0].y() * w0, 0.0f, w0);
					outData[6 * (col * numRows + row) + 5] = tcu::Vec4(quad[3].x() * w3, quad[3].y() * w3, 0.0f, w3);
				}
				else
					DE_ASSERT(DE_FALSE);
			}

			break;
		}

		case FILLRULECASE_CLIPPED_PARTIAL:
		case FILLRULECASE_CLIPPED_FULL:
		{
			const float		quadSide	= (m_caseType == FILLRULECASE_CLIPPED_PARTIAL) ? (1.0f) : (2.0f);
			const tcu::Vec2 center		= (m_caseType == FILLRULECASE_CLIPPED_PARTIAL) ? (tcu::Vec2(0.5f, 0.5f)) : (tcu::Vec2(0.0f, 0.0f));
			const float		rotation	= (float)(iteration) / (float)(m_iterationCount - 1) * DE_PI / 2.0f;
			const tcu::Vec2 sideH		= quadSide * tcu::Vec2(deFloatCos(rotation), deFloatSin(rotation));
			const tcu::Vec2 sideV		= tcu::Vec2(sideH.y(), -sideH.x());
			const tcu::Vec2 quad[4]		=
			{
				center + sideH + sideV,
				center + sideH - sideV,
				center - sideH - sideV,
				center - sideH + sideV,
			};

			outData.resize(6);
			outData[0] = tcu::Vec4(quad[0].x(), quad[0].y(), 0.0f, 1.0f);
			outData[1] = tcu::Vec4(quad[1].x(), quad[1].y(), 0.0f, 1.0f);
			outData[2] = tcu::Vec4(quad[2].x(), quad[2].y(), 0.0f, 1.0f);
			outData[3] = tcu::Vec4(quad[2].x(), quad[2].y(), 0.0f, 1.0f);
			outData[4] = tcu::Vec4(quad[0].x(), quad[0].y(), 0.0f, 1.0f);
			outData[5] = tcu::Vec4(quad[3].x(), quad[3].y(), 0.0f, 1.0f);
			break;
		}

		default:
			DE_ASSERT(DE_FALSE);
	}
}

class CullingTest : public BaseRenderingCase
{
public:
						CullingTest			(Context& ctx, const char* name, const char* desc, glw::GLenum cullMode, glw::GLenum primitive, glw::GLenum faceOrder);
						~CullingTest		(void);
	IterateResult		iterate				(void);

private:
	void				generateVertices	(std::vector<tcu::Vec4>& outData) const;
	void				extractTriangles	(std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles, const std::vector<tcu::Vec4>& vertices) const;
	bool				triangleOrder		(const tcu::Vec4& v0, const tcu::Vec4& v1, const tcu::Vec4& v2) const;

	const glw::GLenum	m_cullMode;
	const glw::GLenum	m_primitive;
	const glw::GLenum	m_faceOrder;
};

CullingTest::CullingTest (Context& ctx, const char* name, const char* desc, glw::GLenum cullMode, glw::GLenum primitive, glw::GLenum faceOrder)
	: BaseRenderingCase	(ctx, name, desc)
	, m_cullMode		(cullMode)
	, m_primitive		(primitive)
	, m_faceOrder		(faceOrder)
{
}

CullingTest::~CullingTest (void)
{
}

CullingTest::IterateResult CullingTest::iterate (void)
{
	tcu::Surface									resultImage(m_renderSize, m_renderSize);
	std::vector<tcu::Vec4>							drawBuffer;
	std::vector<TriangleSceneSpec::SceneTriangle>	triangles;

	// generate scene
	generateVertices(drawBuffer);
	extractTriangles(triangles, drawBuffer);

	// draw image
	{
		const glw::Functions& gl = m_context.getRenderContext().getFunctions();

		gl.enable(GL_CULL_FACE);
		gl.cullFace(m_cullMode);
		gl.frontFace(m_faceOrder);

		m_testCtx.getLog() << tcu::TestLog::Message << "Setting front face to " << glu::getWindingName(m_faceOrder) << tcu::TestLog::EndMessage;
		m_testCtx.getLog() << tcu::TestLog::Message << "Setting cull face to " << glu::getFaceName(m_cullMode) << tcu::TestLog::EndMessage;
		m_testCtx.getLog() << tcu::TestLog::Message << "Drawing test pattern (" << glu::getPrimitiveTypeName(m_primitive) << ")" << tcu::TestLog::EndMessage;

		drawPrimitives(resultImage, drawBuffer, m_primitive);
	}

	// compare
	{
		RasterizationArguments	args;
		TriangleSceneSpec		scene;

		args.numSamples		= m_numSamples;
		args.subpixelBits	= m_subpixelBits;
		args.redBits		= m_context.getRenderTarget().getPixelFormat().redBits;
		args.greenBits		= m_context.getRenderTarget().getPixelFormat().greenBits;
		args.blueBits		= m_context.getRenderTarget().getPixelFormat().blueBits;

		scene.triangles.swap(triangles);

		if (verifyTriangleGroupRasterization(resultImage, scene, args, m_testCtx.getLog(), tcu::VERIFICATIONMODE_WEAK))
			m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		else
			m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Incorrect rendering");
	}

	return STOP;
}

void CullingTest::generateVertices (std::vector<tcu::Vec4>& outData) const
{
	de::Random rnd(543210);

	outData.resize(6);
	for (int vtxNdx = 0; vtxNdx < (int)outData.size(); ++vtxNdx)
	{
		outData[vtxNdx].x() = rnd.getFloat(-0.9f, 0.9f);
		outData[vtxNdx].y() = rnd.getFloat(-0.9f, 0.9f);
		outData[vtxNdx].z() = 0.0f;
		outData[vtxNdx].w() = 1.0f;
	}
}

void CullingTest::extractTriangles (std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles, const std::vector<tcu::Vec4>& vertices) const
{
	const bool cullDirection = (m_cullMode == GL_FRONT) ^ (m_faceOrder == GL_CCW);

	// No triangles
	if (m_cullMode == GL_FRONT_AND_BACK)
		return;

	switch (m_primitive)
	{
		case GL_TRIANGLES:
		{
			for (int vtxNdx = 0; vtxNdx < (int)vertices.size() - 2; vtxNdx += 3)
			{
				const tcu::Vec4& v0 = vertices[vtxNdx + 0];
				const tcu::Vec4& v1 = vertices[vtxNdx + 1];
				const tcu::Vec4& v2 = vertices[vtxNdx + 2];

				if (triangleOrder(v0, v1, v2) != cullDirection)
				{
					TriangleSceneSpec::SceneTriangle tri;
					tri.positions[0] = v0;	tri.sharedEdge[0] = false;
					tri.positions[1] = v1;	tri.sharedEdge[1] = false;
					tri.positions[2] = v2;	tri.sharedEdge[2] = false;

					outTriangles.push_back(tri);
				}
			}
			break;
		}

		case GL_TRIANGLE_STRIP:
		{
			for (int vtxNdx = 0; vtxNdx < (int)vertices.size() - 2; ++vtxNdx)
			{
				const tcu::Vec4& v0 = vertices[vtxNdx + 0];
				const tcu::Vec4& v1 = vertices[vtxNdx + 1];
				const tcu::Vec4& v2 = vertices[vtxNdx + 2];

				if (triangleOrder(v0, v1, v2) != (cullDirection ^ (vtxNdx % 2 != 0)))
				{
					TriangleSceneSpec::SceneTriangle tri;
					tri.positions[0] = v0;	tri.sharedEdge[0] = false;
					tri.positions[1] = v1;	tri.sharedEdge[1] = false;
					tri.positions[2] = v2;	tri.sharedEdge[2] = false;

					outTriangles.push_back(tri);
				}
			}
			break;
		}

		case GL_TRIANGLE_FAN:
		{
			for (int vtxNdx = 1; vtxNdx < (int)vertices.size() - 1; ++vtxNdx)
			{
				const tcu::Vec4& v0 = vertices[0];
				const tcu::Vec4& v1 = vertices[vtxNdx + 0];
				const tcu::Vec4& v2 = vertices[vtxNdx + 1];

				if (triangleOrder(v0, v1, v2) != cullDirection)
				{
					TriangleSceneSpec::SceneTriangle tri;
					tri.positions[0] = v0;	tri.sharedEdge[0] = false;
					tri.positions[1] = v1;	tri.sharedEdge[1] = false;
					tri.positions[2] = v2;	tri.sharedEdge[2] = false;

					outTriangles.push_back(tri);
				}
			}
			break;
		}

		default:
			DE_ASSERT(false);
	}
}

bool CullingTest::triangleOrder (const tcu::Vec4& v0, const tcu::Vec4& v1, const tcu::Vec4& v2) const
{
	const tcu::Vec2 s0 = v0.swizzle(0, 1) / v0.w();
	const tcu::Vec2 s1 = v1.swizzle(0, 1) / v1.w();
	const tcu::Vec2 s2 = v2.swizzle(0, 1) / v2.w();

	// cross
	return ((s1.x() - s0.x()) * (s2.y() - s0.y()) - (s2.x() - s0.x()) * (s1.y() - s0.y())) < 0;
}

class TriangleInterpolationTest : public BaseRenderingCase
{
public:
						TriangleInterpolationTest	(Context& ctx, const char* name, const char* desc, glw::GLenum primitive, int flags);
						~TriangleInterpolationTest	(void);
	IterateResult		iterate						(void);

private:
	void				generateVertices			(int iteration, std::vector<tcu::Vec4>& outVertices, std::vector<tcu::Vec4>& outColors) const;
	void				extractTriangles			(std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles, const std::vector<tcu::Vec4>& vertices, const std::vector<tcu::Vec4>& colors) const;

	const glw::GLenum	m_primitive;
	const bool			m_projective;
	const int			m_iterationCount;

	int					m_iteration;
	bool				m_allIterationsPassed;
};

TriangleInterpolationTest::TriangleInterpolationTest (Context& ctx, const char* name, const char* desc, glw::GLenum primitive, int flags)
	: BaseRenderingCase		(ctx, name, desc)
	, m_primitive			(primitive)
	, m_projective			((flags & INTERPOLATIONFLAGS_PROJECTED) != 0)
	, m_iterationCount		(3)
	, m_iteration			(0)
	, m_allIterationsPassed	(true)
{
}

TriangleInterpolationTest::~TriangleInterpolationTest (void)
{
	deinit();
}

TriangleInterpolationTest::IterateResult TriangleInterpolationTest::iterate (void)
{
	const std::string								iterationDescription	= "Test iteration " + de::toString(m_iteration+1) + " / " + de::toString(m_iterationCount);
	const tcu::ScopedLogSection						section					(m_testCtx.getLog(), "Iteration" + de::toString(m_iteration+1), iterationDescription);
	tcu::Surface									resultImage				(m_renderSize, m_renderSize);
	std::vector<tcu::Vec4>							drawBuffer;
	std::vector<tcu::Vec4>							colorBuffer;
	std::vector<TriangleSceneSpec::SceneTriangle>	triangles;

	// generate scene
	generateVertices(m_iteration, drawBuffer, colorBuffer);
	extractTriangles(triangles, drawBuffer, colorBuffer);

	// log
	{
		m_testCtx.getLog() << tcu::TestLog::Message << "Generated vertices:" << tcu::TestLog::EndMessage;
		for (int vtxNdx = 0; vtxNdx < (int)drawBuffer.size(); ++vtxNdx)
			m_testCtx.getLog() << tcu::TestLog::Message << "\t" << drawBuffer[vtxNdx] << ",\tcolor= " << colorBuffer[vtxNdx] << tcu::TestLog::EndMessage;
	}

	// draw image
	drawPrimitives(resultImage, drawBuffer, colorBuffer, m_primitive);

	// compare
	{
		RasterizationArguments	args;
		TriangleSceneSpec		scene;

		args.numSamples		= m_numSamples;
		args.subpixelBits	= m_subpixelBits;
		args.redBits		= m_context.getRenderTarget().getPixelFormat().redBits;
		args.greenBits		= m_context.getRenderTarget().getPixelFormat().greenBits;
		args.blueBits		= m_context.getRenderTarget().getPixelFormat().blueBits;

		scene.triangles.swap(triangles);

		if (!verifyTriangleGroupInterpolation(resultImage, scene, args, m_testCtx.getLog()))
			m_allIterationsPassed = false;
	}

	// result
	if (++m_iteration == m_iterationCount)
	{
		if (m_allIterationsPassed)
			m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		else
			m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Found invalid pixel values");

		return STOP;
	}
	else
		return CONTINUE;
}

void TriangleInterpolationTest::generateVertices (int iteration, std::vector<tcu::Vec4>& outVertices, std::vector<tcu::Vec4>& outColors) const
{
	// use only red, green and blue
	const tcu::Vec4 colors[] =
	{
		tcu::Vec4(1.0f, 0.0f, 0.0f, 1.0f),
		tcu::Vec4(0.0f, 1.0f, 0.0f, 1.0f),
		tcu::Vec4(0.0f, 0.0f, 1.0f, 1.0f),
	};

	de::Random rnd(123 + iteration * 1000 + (int)m_primitive);

	outVertices.resize(6);
	outColors.resize(6);

	for (int vtxNdx = 0; vtxNdx < (int)outVertices.size(); ++vtxNdx)
	{
		outVertices[vtxNdx].x() = rnd.getFloat(-0.9f, 0.9f);
		outVertices[vtxNdx].y() = rnd.getFloat(-0.9f, 0.9f);
		outVertices[vtxNdx].z() = 0.0f;

		if (!m_projective)
			outVertices[vtxNdx].w() = 1.0f;
		else
		{
			const float w = rnd.getFloat(0.2f, 4.0f);

			outVertices[vtxNdx].x() *= w;
			outVertices[vtxNdx].y() *= w;
			outVertices[vtxNdx].z() *= w;
			outVertices[vtxNdx].w() = w;
		}

		outColors[vtxNdx] = colors[vtxNdx % DE_LENGTH_OF_ARRAY(colors)];
	}
}

void TriangleInterpolationTest::extractTriangles (std::vector<TriangleSceneSpec::SceneTriangle>& outTriangles, const std::vector<tcu::Vec4>& vertices, const std::vector<tcu::Vec4>& colors) const
{
	switch (m_primitive)
	{
		case GL_TRIANGLES:
		{
			for (int vtxNdx = 0; vtxNdx < (int)vertices.size() - 2; vtxNdx += 3)
			{
				TriangleSceneSpec::SceneTriangle tri;
				tri.positions[0]	= vertices[vtxNdx + 0];
				tri.positions[1]	= vertices[vtxNdx + 1];
				tri.positions[2]	= vertices[vtxNdx + 2];
				tri.sharedEdge[0]	= false;
				tri.sharedEdge[1]	= false;
				tri.sharedEdge[2]	= false;

				tri.colors[0] = colors[vtxNdx + 0];
				tri.colors[1] = colors[vtxNdx + 1];
				tri.colors[2] = colors[vtxNdx + 2];

				outTriangles.push_back(tri);
			}
			break;
		}

		case GL_TRIANGLE_STRIP:
		{
			for (int vtxNdx = 0; vtxNdx < (int)vertices.size() - 2; ++vtxNdx)
			{
				TriangleSceneSpec::SceneTriangle tri;
				tri.positions[0]	= vertices[vtxNdx + 0];
				tri.positions[1]	= vertices[vtxNdx + 1];
				tri.positions[2]	= vertices[vtxNdx + 2];
				tri.sharedEdge[0]	= false;
				tri.sharedEdge[1]	= false;
				tri.sharedEdge[2]	= false;

				tri.colors[0] = colors[vtxNdx + 0];
				tri.colors[1] = colors[vtxNdx + 1];
				tri.colors[2] = colors[vtxNdx + 2];

				outTriangles.push_back(tri);
			}
			break;
		}

		case GL_TRIANGLE_FAN:
		{
			for (int vtxNdx = 1; vtxNdx < (int)vertices.size() - 1; ++vtxNdx)
			{
				TriangleSceneSpec::SceneTriangle tri;
				tri.positions[0]	= vertices[0];
				tri.positions[1]	= vertices[vtxNdx + 0];
				tri.positions[2]	= vertices[vtxNdx + 1];
				tri.sharedEdge[0]	= false;
				tri.sharedEdge[1]	= false;
				tri.sharedEdge[2]	= false;

				tri.colors[0] = colors[0];
				tri.colors[1] = colors[vtxNdx + 0];
				tri.colors[2] = colors[vtxNdx + 1];

				outTriangles.push_back(tri);
			}
			break;
		}

		default:
			DE_ASSERT(false);
	}
}

class LineInterpolationTest : public BaseRenderingCase
{
public:
							LineInterpolationTest	(Context& ctx, const char* name, const char* desc, glw::GLenum primitive, int flags, float lineWidth);
							~LineInterpolationTest	(void);
	IterateResult			iterate					(void);

private:
	void					generateVertices		(int iteration, std::vector<tcu::Vec4>& outVertices, std::vector<tcu::Vec4>& outColors) const;
	void					extractLines			(std::vector<LineSceneSpec::SceneLine>& outLines, const std::vector<tcu::Vec4>& vertices, const std::vector<tcu::Vec4>& colors) const;

	const glw::GLenum		m_primitive;
	const bool				m_projective;
	const int				m_iterationCount;

	int						m_iteration;
	tcu::ResultCollector	m_result;
};

LineInterpolationTest::LineInterpolationTest (Context& ctx, const char* name, const char* desc, glw::GLenum primitive, int flags, float lineWidth)
	: BaseRenderingCase		(ctx, name, desc)
	, m_primitive			(primitive)
	, m_projective			((flags & INTERPOLATIONFLAGS_PROJECTED) != 0)
	, m_iterationCount		(3)
	, m_iteration			(0)
{
	m_lineWidth = lineWidth;
}

LineInterpolationTest::~LineInterpolationTest (void)
{
	deinit();
}

LineInterpolationTest::IterateResult LineInterpolationTest::iterate (void)
{
	const std::string						iterationDescription	= "Test iteration " + de::toString(m_iteration+1) + " / " + de::toString(m_iterationCount);
	const tcu::ScopedLogSection				section					(m_testCtx.getLog(), "Iteration" + de::toString(m_iteration+1), iterationDescription);
	tcu::Surface							resultImage				(m_renderSize, m_renderSize);
	std::vector<tcu::Vec4>					drawBuffer;
	std::vector<tcu::Vec4>					colorBuffer;
	std::vector<LineSceneSpec::SceneLine>	lines;

	// generate scene
	generateVertices(m_iteration, drawBuffer, colorBuffer);
	extractLines(lines, drawBuffer, colorBuffer);

	// log
	{
		m_testCtx.getLog() << tcu::TestLog::Message << "Generated vertices:" << tcu::TestLog::EndMessage;
		for (int vtxNdx = 0; vtxNdx < (int)drawBuffer.size(); ++vtxNdx)
			m_testCtx.getLog() << tcu::TestLog::Message << "\t" << drawBuffer[vtxNdx] << ",\tcolor= " << colorBuffer[vtxNdx] << tcu::TestLog::EndMessage;
	}

	// draw image
	drawPrimitives(resultImage, drawBuffer, colorBuffer, m_primitive);

	// compare
	{
		RasterizationArguments	args;
		LineSceneSpec			scene;
		LineInterpolationMethod	iterationResult;

		args.numSamples		= m_numSamples;
		args.subpixelBits	= m_subpixelBits;
		args.redBits		= m_context.getRenderTarget().getPixelFormat().redBits;
		args.greenBits		= m_context.getRenderTarget().getPixelFormat().greenBits;
		args.blueBits		= m_context.getRenderTarget().getPixelFormat().blueBits;

		scene.lines.swap(lines);
		scene.lineWidth = m_lineWidth;
		scene.stippleFactor = 1;
		scene.stipplePattern = 0xFFFF;
		scene.allowNonProjectedInterpolation = true;


		iterationResult = verifyLineGroupInterpolation(resultImage, scene, args, m_testCtx.getLog());
		switch (iterationResult)
		{
			case tcu::LINEINTERPOLATION_STRICTLY_CORRECT:
				// line interpolation matches the specification
				m_result.addResult(QP_TEST_RESULT_PASS, "Pass");
				break;

			case tcu::LINEINTERPOLATION_PROJECTED:
				// line interpolation weights are otherwise correct, but they are projected onto major axis
				m_testCtx.getLog()	<< tcu::TestLog::Message
									<< "Interpolation was calculated using coordinates projected onto major axis. "
									   "This method does not produce the same values as the non-projecting method defined in the specification."
									<< tcu::TestLog::EndMessage;
				m_result.addResult(QP_TEST_RESULT_QUALITY_WARNING, "Interpolation was calculated using projected coordinateds");
				break;

			case tcu::LINEINTERPOLATION_INCORRECT:
				if (scene.lineWidth != 1.0f && m_numSamples > 1)
				{
					// multisampled wide lines might not be supported
					m_result.addResult(QP_TEST_RESULT_COMPATIBILITY_WARNING, "Interpolation of multisampled wide lines failed");
				}
				else
				{
					// line interpolation is incorrect
					m_result.addResult(QP_TEST_RESULT_FAIL, "Found invalid pixel values");
				}
				break;

			default:
				DE_ASSERT(false);
				break;
		}
	}

	// result
	if (++m_iteration == m_iterationCount)
	{
		m_result.setTestContextResult(m_testCtx);
		return STOP;
	}
	else
		return CONTINUE;
}

void LineInterpolationTest::generateVertices (int iteration, std::vector<tcu::Vec4>& outVertices, std::vector<tcu::Vec4>& outColors) const
{
	// use only red, green and blue
	const tcu::Vec4 colors[] =
	{
		tcu::Vec4(1.0f, 0.0f, 0.0f, 1.0f),
		tcu::Vec4(0.0f, 1.0f, 0.0f, 1.0f),
		tcu::Vec4(0.0f, 0.0f, 1.0f, 1.0f),
	};

	de::Random rnd(123 + iteration * 1000 + (int)m_primitive);

	outVertices.resize(6);
	outColors.resize(6);

	for (int vtxNdx = 0; vtxNdx < (int)outVertices.size(); ++vtxNdx)
	{
		outVertices[vtxNdx].x() = rnd.getFloat(-0.9f, 0.9f);
		outVertices[vtxNdx].y() = rnd.getFloat(-0.9f, 0.9f);
		outVertices[vtxNdx].z() = 0.0f;

		if (!m_projective)
			outVertices[vtxNdx].w() = 1.0f;
		else
		{
			const float w = rnd.getFloat(0.2f, 4.0f);

			outVertices[vtxNdx].x() *= w;
			outVertices[vtxNdx].y() *= w;
			outVertices[vtxNdx].z() *= w;
			outVertices[vtxNdx].w() = w;
		}

		outColors[vtxNdx] = colors[vtxNdx % DE_LENGTH_OF_ARRAY(colors)];
	}
}

void LineInterpolationTest::extractLines (std::vector<LineSceneSpec::SceneLine>& outLines, const std::vector<tcu::Vec4>& vertices, const std::vector<tcu::Vec4>& colors) const
{
	switch (m_primitive)
	{
		case GL_LINES:
		{
			for (int vtxNdx = 0; vtxNdx < (int)vertices.size() - 1; vtxNdx += 2)
			{
				LineSceneSpec::SceneLine line;
				line.positions[0] = vertices[vtxNdx + 0];
				line.positions[1] = vertices[vtxNdx + 1];

				line.colors[0] = colors[vtxNdx + 0];
				line.colors[1] = colors[vtxNdx + 1];

				outLines.push_back(line);
			}
			break;
		}

		case GL_LINE_STRIP:
		{
			for (int vtxNdx = 0; vtxNdx < (int)vertices.size() - 1; ++vtxNdx)
			{
				LineSceneSpec::SceneLine line;
				line.positions[0] = vertices[vtxNdx + 0];
				line.positions[1] = vertices[vtxNdx + 1];

				line.colors[0] = colors[vtxNdx + 0];
				line.colors[1] = colors[vtxNdx + 1];

				outLines.push_back(line);
			}
			break;
		}

		case GL_LINE_LOOP:
		{
			for (int vtxNdx = 0; vtxNdx < (int)vertices.size(); ++vtxNdx)
			{
				LineSceneSpec::SceneLine line;
				line.positions[0] = vertices[(vtxNdx + 0) % (int)vertices.size()];
				line.positions[1] = vertices[(vtxNdx + 1) % (int)vertices.size()];

				line.colors[0] = colors[(vtxNdx + 0) % (int)vertices.size()];
				line.colors[1] = colors[(vtxNdx + 1) % (int)vertices.size()];

				outLines.push_back(line);
			}
			break;
		}

		default:
			DE_ASSERT(false);
	}
}

} // anonymous

RasterizationTests::RasterizationTests (Context& context)
	: TestCaseGroup(context, "rasterization", "Rasterization Tests")
{
}

RasterizationTests::~RasterizationTests (void)
{
}

void RasterizationTests::init (void)
{
	// .primitives
	{
		tcu::TestCaseGroup* const primitives = new tcu::TestCaseGroup(m_testCtx, "primitives", "Primitive rasterization");

		addChild(primitives);

		primitives->addChild(new TrianglesCase		(m_context, "triangles",		"Render primitives as GL_TRIANGLES, verify rasterization result"));
		primitives->addChild(new TriangleStripCase	(m_context, "triangle_strip",	"Render primitives as GL_TRIANGLE_STRIP, verify rasterization result"));
		primitives->addChild(new TriangleFanCase	(m_context, "triangle_fan",		"Render primitives as GL_TRIANGLE_FAN, verify rasterization result"));
		primitives->addChild(new LinesCase			(m_context, "lines",			"Render primitives as GL_LINES, verify rasterization result",							PRIMITIVEWIDENESS_NARROW));
		primitives->addChild(new LineStripCase		(m_context, "line_strip",		"Render primitives as GL_LINE_STRIP, verify rasterization result",						PRIMITIVEWIDENESS_NARROW));
		primitives->addChild(new LineLoopCase		(m_context, "line_loop",		"Render primitives as GL_LINE_LOOP, verify rasterization result",						PRIMITIVEWIDENESS_NARROW));
		primitives->addChild(new LinesCase			(m_context, "lines_wide",		"Render primitives as GL_LINES with wide lines, verify rasterization result",			PRIMITIVEWIDENESS_WIDE));
		primitives->addChild(new LineStripCase		(m_context, "line_strip_wide",	"Render primitives as GL_LINE_STRIP with wide lines, verify rasterization result",		PRIMITIVEWIDENESS_WIDE));
		primitives->addChild(new LineLoopCase		(m_context, "line_loop_wide",	"Render primitives as GL_LINE_LOOP with wide lines, verify rasterization result",		PRIMITIVEWIDENESS_WIDE));
		primitives->addChild(new PointCase			(m_context, "points",			"Render primitives as GL_POINTS, verify rasterization result",							PRIMITIVEWIDENESS_WIDE));
	}

	// .limits
	{
		tcu::TestCaseGroup* const limits = new tcu::TestCaseGroup(m_testCtx, "limits", "Primitive width limits");

		addChild(limits);

		limits->addChild(new PointSizeClampedTest(m_context, "points", "gl_PointSize is clamped to ALIASED_POINT_SIZE_RANGE"));
	}

	// .fill_rules
	{
		tcu::TestCaseGroup* const fillRules = new tcu::TestCaseGroup(m_testCtx, "fill_rules", "Primitive fill rules");

		addChild(fillRules);

		fillRules->addChild(new FillRuleCase(m_context,	"basic_quad",			"Verify fill rules",	FillRuleCase::FILLRULECASE_BASIC));
		fillRules->addChild(new FillRuleCase(m_context,	"basic_quad_reverse",	"Verify fill rules",	FillRuleCase::FILLRULECASE_REVERSED));
		fillRules->addChild(new FillRuleCase(m_context,	"clipped_full",			"Verify fill rules",	FillRuleCase::FILLRULECASE_CLIPPED_FULL));
		fillRules->addChild(new FillRuleCase(m_context,	"clipped_partly",		"Verify fill rules",	FillRuleCase::FILLRULECASE_CLIPPED_PARTIAL));
		fillRules->addChild(new FillRuleCase(m_context,	"projected",			"Verify fill rules",	FillRuleCase::FILLRULECASE_PROJECTED));
	}

	// .culling
	{
		static const struct CullMode
		{
			glw::GLenum	mode;
			const char*	prefix;
		} cullModes[] =
		{
			{ GL_FRONT,				"front_"	},
			{ GL_BACK,				"back_"		},
			{ GL_FRONT_AND_BACK,	"both_"		},
		};
		static const struct PrimitiveType
		{
			glw::GLenum	type;
			const char*	name;
		} primitiveTypes[] =
		{
			{ GL_TRIANGLES,			"triangles"			},
			{ GL_TRIANGLE_STRIP,	"triangle_strip"	},
			{ GL_TRIANGLE_FAN,		"triangle_fan"		},
		};
		static const struct FrontFaceOrder
		{
			glw::GLenum	mode;
			const char*	postfix;
		} frontOrders[] =
		{
			{ GL_CCW,	""			},
			{ GL_CW,	"_reverse"	},
		};

		tcu::TestCaseGroup* const culling = new tcu::TestCaseGroup(m_testCtx, "culling", "Culling");

		addChild(culling);

		for (int cullModeNdx   = 0; cullModeNdx   < DE_LENGTH_OF_ARRAY(cullModes);      ++cullModeNdx)
		for (int primitiveNdx  = 0; primitiveNdx  < DE_LENGTH_OF_ARRAY(primitiveTypes); ++primitiveNdx)
		for (int frontOrderNdx = 0; frontOrderNdx < DE_LENGTH_OF_ARRAY(frontOrders);    ++frontOrderNdx)
		{
			const std::string name = std::string(cullModes[cullModeNdx].prefix) + primitiveTypes[primitiveNdx].name + frontOrders[frontOrderNdx].postfix;

			culling->addChild(new CullingTest(m_context, name.c_str(), "Test primitive culling.", cullModes[cullModeNdx].mode, primitiveTypes[primitiveNdx].type, frontOrders[frontOrderNdx].mode));
		}
	}

	// .interpolation
	{
		tcu::TestCaseGroup* const interpolation = new tcu::TestCaseGroup(m_testCtx, "interpolation", "Test interpolation");

		addChild(interpolation);

		// .basic
		{
			tcu::TestCaseGroup* const basic = new tcu::TestCaseGroup(m_testCtx, "basic", "Non-projective interpolation");

			interpolation->addChild(basic);

			basic->addChild(new TriangleInterpolationTest		(m_context, "triangles",		"Verify triangle interpolation",		GL_TRIANGLES,		INTERPOLATIONFLAGS_NONE));
			basic->addChild(new TriangleInterpolationTest		(m_context, "triangle_strip",	"Verify triangle strip interpolation",	GL_TRIANGLE_STRIP,	INTERPOLATIONFLAGS_NONE));
			basic->addChild(new TriangleInterpolationTest		(m_context, "triangle_fan",		"Verify triangle fan interpolation",	GL_TRIANGLE_FAN,	INTERPOLATIONFLAGS_NONE));
			basic->addChild(new LineInterpolationTest			(m_context, "lines",			"Verify line interpolation",			GL_LINES,			INTERPOLATIONFLAGS_NONE,	1.0f));
			basic->addChild(new LineInterpolationTest			(m_context, "line_strip",		"Verify line strip interpolation",		GL_LINE_STRIP,		INTERPOLATIONFLAGS_NONE,	1.0f));
			basic->addChild(new LineInterpolationTest			(m_context, "line_loop",		"Verify line loop interpolation",		GL_LINE_LOOP,		INTERPOLATIONFLAGS_NONE,	1.0f));
			basic->addChild(new LineInterpolationTest			(m_context, "lines_wide",		"Verify wide line interpolation",		GL_LINES,			INTERPOLATIONFLAGS_NONE,	5.0f));
			basic->addChild(new LineInterpolationTest			(m_context, "line_strip_wide",	"Verify wide line strip interpolation",	GL_LINE_STRIP,		INTERPOLATIONFLAGS_NONE,	5.0f));
			basic->addChild(new LineInterpolationTest			(m_context, "line_loop_wide",	"Verify wide line loop interpolation",	GL_LINE_LOOP,		INTERPOLATIONFLAGS_NONE,	5.0f));
		}

		// .projected
		{
			tcu::TestCaseGroup* const projected = new tcu::TestCaseGroup(m_testCtx, "projected", "Projective interpolation");

			interpolation->addChild(projected);

			projected->addChild(new TriangleInterpolationTest	(m_context, "triangles",		"Verify triangle interpolation",		GL_TRIANGLES,		INTERPOLATIONFLAGS_PROJECTED));
			projected->addChild(new TriangleInterpolationTest	(m_context, "triangle_strip",	"Verify triangle strip interpolation",	GL_TRIANGLE_STRIP,	INTERPOLATIONFLAGS_PROJECTED));
			projected->addChild(new TriangleInterpolationTest	(m_context, "triangle_fan",		"Verify triangle fan interpolation",	GL_TRIANGLE_FAN,	INTERPOLATIONFLAGS_PROJECTED));
			projected->addChild(new LineInterpolationTest		(m_context, "lines",			"Verify line interpolation",			GL_LINES,			INTERPOLATIONFLAGS_PROJECTED,	1.0f));
			projected->addChild(new LineInterpolationTest		(m_context, "line_strip",		"Verify line strip interpolation",		GL_LINE_STRIP,		INTERPOLATIONFLAGS_PROJECTED,	1.0f));
			projected->addChild(new LineInterpolationTest		(m_context, "line_loop",		"Verify line loop interpolation",		GL_LINE_LOOP,		INTERPOLATIONFLAGS_PROJECTED,	1.0f));
			projected->addChild(new LineInterpolationTest		(m_context, "lines_wide",		"Verify wide line interpolation",		GL_LINES,			INTERPOLATIONFLAGS_PROJECTED,	5.0f));
			projected->addChild(new LineInterpolationTest		(m_context, "line_strip_wide",	"Verify wide line strip interpolation",	GL_LINE_STRIP,		INTERPOLATIONFLAGS_PROJECTED,	5.0f));
			projected->addChild(new LineInterpolationTest		(m_context, "line_loop_wide",	"Verify wide line loop interpolation",	GL_LINE_LOOP,		INTERPOLATIONFLAGS_PROJECTED,	5.0f));
		}
	}
}

} // Functional
} // gles2
} // deqp