xref: /external/deqp/modules/gles3/functional/es3fTransformFeedbackTests.cpp

/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES 3.0 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 Transform feedback tests.
 *//*--------------------------------------------------------------------*/

#include "es3fTransformFeedbackTests.hpp"
#include "tcuTestLog.hpp"
#include "tcuSurface.hpp"
#include "tcuImageCompare.hpp"
#include "tcuVector.hpp"
#include "tcuFormatUtil.hpp"
#include "tcuRenderTarget.hpp"
#include "gluShaderUtil.hpp"
#include "gluVarType.hpp"
#include "gluVarTypeUtil.hpp"
#include "gluPixelTransfer.hpp"
#include "gluRenderContext.hpp"
#include "gluShaderProgram.hpp"
#include "gluObjectWrapper.hpp"
#include "glwFunctions.hpp"
#include "glwEnums.hpp"
#include "deRandom.hpp"
#include "deStringUtil.hpp"
#include "deMemory.h"
#include "deString.h"

#include <set>
#include <map>
#include <algorithm>

using std::string;
using std::vector;
using std::set;

using std::map;
using std::set;

using tcu::TestLog;

namespace deqp
{
namespace gles3
{
namespace Functional
{
namespace TransformFeedback
{

enum
{
	VIEWPORT_WIDTH			= 128,
	VIEWPORT_HEIGHT			= 128,
	BUFFER_GUARD_MULTIPLIER = 2		//!< stride*BUFFER_GUARD_MULTIPLIER bytes are added to the end of tf buffer and used to check for overruns.
};

enum Interpolation
{
	INTERPOLATION_SMOOTH = 0,
	INTERPOLATION_FLAT,
	INTERPOLATION_CENTROID,

	INTERPOLATION_LAST
};

static const char* getInterpolationName (Interpolation interp)
{
	switch (interp)
	{
		case INTERPOLATION_SMOOTH:		return "smooth";
		case INTERPOLATION_FLAT:		return "flat";
		case INTERPOLATION_CENTROID:	return "centroid";
		default:
			DE_ASSERT(false);
			return DE_NULL;
	}
}

struct Varying
{
						Varying				(const char* name_, const glu::VarType& type_, Interpolation interp_)
							: name			(name_)
							, type			(type_)
							, interpolation	(interp_)
						{
						}

	std::string			name;				//!< Variable name.
	glu::VarType		type;				//!< Variable type.
	Interpolation		interpolation;		//!< Interpolation mode (smooth, flat, centroid).
};

struct VaryingNameEquals
{
					VaryingNameEquals	(const std::string& name_) : name(name_) {}
	bool			operator()			(const Varying& var) const { return var.name == name; }

	std::string		name;
};

struct Attribute
{
	Attribute (const std::string& name_, const glu::VarType& type_, int offset_)
		: name		(name_)
		, type		(type_)
		, offset	(offset_)
	{
	}

	std::string			name;
	glu::VarType		type;
	int					offset;
};

struct AttributeNameEquals
{
					AttributeNameEquals	(const std::string& name_) : name(name_) {}
	bool			operator()			(const Attribute& attr) const { return attr.name == name; }

	std::string		name;
};

struct Output
{
	Output (void)
		: bufferNdx	(0)
		, offset	(0)
	{
	}

	std::string					name;
	glu::VarType				type;
	int							bufferNdx;
	int							offset;
	vector<const Attribute*>	inputs;
};

struct DrawCall
{
				DrawCall (int numElements_, bool tfEnabled_)
					: numElements				(numElements_)
					, transformFeedbackEnabled	(tfEnabled_)
				{
				}

				DrawCall (void)
					: numElements				(0)
					, transformFeedbackEnabled	(false)
				{
				}

	int			numElements;
	bool		transformFeedbackEnabled;
};

std::ostream& operator<< (std::ostream& str, const DrawCall& call)
{
	return str << "(" << call.numElements << ", " << (call.transformFeedbackEnabled ? "resumed" : "paused") << ")";
}

class ProgramSpec
{
public:
									ProgramSpec						(void);
									~ProgramSpec					(void);

	glu::StructType*				createStruct					(const char* name);
	void							addVarying						(const char* name, const glu::VarType& type, Interpolation interp);
	void							addTransformFeedbackVarying		(const char* name);

	const vector<glu::StructType*>&	getStructs						(void) const { return m_structs;	}
	const vector<Varying>&			getVaryings						(void) const { return m_varyings;	}
	const vector<string>&			getTransformFeedbackVaryings	(void) const { return m_transformFeedbackVaryings; }
	bool							isPointSizeUsed					(void) const;

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

	vector<glu::StructType*>		m_structs;
	vector<Varying>					m_varyings;
	vector<string>					m_transformFeedbackVaryings;
};

// ProgramSpec

ProgramSpec::ProgramSpec (void)
{
}

ProgramSpec::~ProgramSpec (void)
{
	for (vector<glu::StructType*>::iterator i = m_structs.begin(); i != m_structs.end(); i++)
		delete *i;
}

glu::StructType* ProgramSpec::createStruct (const char* name)
{
	m_structs.reserve(m_structs.size()+1);
	m_structs.push_back(new glu::StructType(name));
	return m_structs.back();
}

void ProgramSpec::addVarying (const char* name, const glu::VarType& type, Interpolation interp)
{
	m_varyings.push_back(Varying(name, type, interp));
}

void ProgramSpec::addTransformFeedbackVarying (const char* name)
{
	m_transformFeedbackVaryings.push_back(name);
}

bool ProgramSpec::isPointSizeUsed (void) const
{
	return std::find(m_transformFeedbackVaryings.begin(), m_transformFeedbackVaryings.end(), "gl_PointSize") != m_transformFeedbackVaryings.end();
}

static bool isProgramSupported (const glw::Functions& gl, const ProgramSpec& spec, deUint32 tfMode)
{
	int		maxVertexAttribs			= 0;
	int		maxTfInterleavedComponents	= 0;
	int		maxTfSeparateAttribs		= 0;
	int		maxTfSeparateComponents		= 0;

	gl.getIntegerv(GL_MAX_VERTEX_ATTRIBS,								&maxVertexAttribs);
	gl.getIntegerv(GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS,	&maxTfInterleavedComponents);
	gl.getIntegerv(GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,			&maxTfSeparateAttribs);
	gl.getIntegerv(GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS,		&maxTfSeparateComponents);

	// Check vertex attribs.
	int totalVertexAttribs	= 1 /* a_position */ + (spec.isPointSizeUsed() ? 1 : 0);
	for (vector<Varying>::const_iterator var = spec.getVaryings().begin(); var != spec.getVaryings().end(); var++)
	{
		for (glu::VectorTypeIterator vecIter = glu::VectorTypeIterator::begin(&var->type); vecIter != glu::VectorTypeIterator::end(&var->type); vecIter++)
			totalVertexAttribs += 1;
	}

	if (totalVertexAttribs > maxVertexAttribs)
		return false; // Vertex attribute count exceeded.

	// Check varyings.
	int totalTfComponents	= 0;
	int totalTfAttribs		= 0;
	for (vector<string>::const_iterator iter = spec.getTransformFeedbackVaryings().begin(); iter != spec.getTransformFeedbackVaryings().end(); iter++)
	{
		const string&	name			= *iter;
		int				numComponents	= 0;

		if (name == "gl_Position")
			numComponents = 4;
		else if (name == "gl_PointSize")
			numComponents = 1;
		else
		{
			string						varName		= glu::parseVariableName(name.c_str());
			const Varying&				varying		= *std::find_if(spec.getVaryings().begin(), spec.getVaryings().end(), VaryingNameEquals(varName));
			glu::TypeComponentVector	varPath;

			glu::parseTypePath(name.c_str(), varying.type, varPath);
			numComponents = glu::getVarType(varying.type, varPath).getScalarSize();
		}

		if (tfMode == GL_SEPARATE_ATTRIBS && numComponents > maxTfSeparateComponents)
			return false; // Per-attribute component count exceeded.

		totalTfComponents	+= numComponents;
		totalTfAttribs		+= 1;
	}

	if (tfMode == GL_SEPARATE_ATTRIBS && totalTfAttribs > maxTfSeparateAttribs)
		return false;

	if (tfMode == GL_INTERLEAVED_ATTRIBS && totalTfComponents > maxTfInterleavedComponents)
		return false;

	return true;
}

// Program

static std::string getAttributeName (const char* varyingName, const glu::TypeComponentVector& path)
{
	std::ostringstream str;

	str << "a_" << (deStringBeginsWith(varyingName, "v_") ? varyingName+2 : varyingName);

	for (glu::TypeComponentVector::const_iterator iter = path.begin(); iter != path.end(); iter++)
	{
		const char* prefix = DE_NULL;

		switch (iter->type)
		{
			case glu::VarTypeComponent::STRUCT_MEMBER:		prefix = "_m";	break;
			case glu::VarTypeComponent::ARRAY_ELEMENT:		prefix = "_e";	break;
			case glu::VarTypeComponent::MATRIX_COLUMN:		prefix = "_c";	break;
			case glu::VarTypeComponent::VECTOR_COMPONENT:	prefix = "_s";	break;
			default:
				DE_ASSERT(false);
		}

		str << prefix << iter->index;
	}

	return str.str();
}

static void genShaderSources (const ProgramSpec& spec, std::string& vertSource, std::string& fragSource, bool pointSizeRequired)
{
	std::ostringstream	vtx;
	std::ostringstream	frag;
	bool				addPointSize	= spec.isPointSizeUsed();

	vtx << "#version 300 es\n"
		<< "in highp vec4 a_position;\n";
	frag << "#version 300 es\n"
		 << "layout(location = 0) out mediump vec4 o_color;\n"
		 << "uniform highp vec4 u_scale;\n"
		 << "uniform highp vec4 u_bias;\n";

	if (addPointSize)
		vtx << "in highp float a_pointSize;\n";

	// Declare attributes.
	for (vector<Varying>::const_iterator var = spec.getVaryings().begin(); var != spec.getVaryings().end(); var++)
	{
		const char*			name	= var->name.c_str();
		const glu::VarType&	type	= var->type;

		for (glu::VectorTypeIterator vecIter = glu::VectorTypeIterator::begin(&type); vecIter != glu::VectorTypeIterator::end(&type); vecIter++)
		{
			glu::VarType	attribType	= glu::getVarType(type, vecIter.getPath());
			string			attribName	= getAttributeName(name, vecIter.getPath());

			vtx << "in " << glu::declare(attribType, attribName.c_str()) << ";\n";
		}
	}

	// Declare vayrings.
	for (int ndx = 0; ndx < 2; ndx++)
	{
		const char*			inout	= ndx ? "in" : "out";
		std::ostringstream&	str		= ndx ? frag : vtx;

		// Declare structs that have type name.
		for (vector<glu::StructType*>::const_iterator structIter = spec.getStructs().begin(); structIter != spec.getStructs().end(); structIter++)
		{
			const glu::StructType* structPtr = *structIter;
			if (structPtr->hasTypeName())
				str << glu::declare(structPtr) << ";\n";
		}

		for (vector<Varying>::const_iterator var = spec.getVaryings().begin(); var != spec.getVaryings().end(); var++)
			str << getInterpolationName(var->interpolation) << " " << inout << " " << glu::declare(var->type, var->name.c_str()) << ";\n";
	}

	vtx << "\nvoid main (void)\n{\n"
		<< "\tgl_Position = a_position;\n";
	frag << "\nvoid main (void)\n{\n"
		 << "\thighp vec4 res = vec4(0.0);\n";

	if (addPointSize)
		vtx << "\tgl_PointSize = a_pointSize;\n";
	else if (pointSizeRequired)
		vtx << "\tgl_PointSize = 1.0;\n";

	// Generate assignments / usage.
	for (vector<Varying>::const_iterator var = spec.getVaryings().begin(); var != spec.getVaryings().end(); var++)
	{
		const char*			name	= var->name.c_str();
		const glu::VarType&	type	= var->type;

		for (glu::VectorTypeIterator vecIter = glu::VectorTypeIterator::begin(&type); vecIter != glu::VectorTypeIterator::end(&type); vecIter++)
		{
			glu::VarType	subType		= glu::getVarType(type, vecIter.getPath());
			string			attribName	= getAttributeName(name, vecIter.getPath());

			DE_ASSERT(subType.isBasicType() && glu::isDataTypeScalarOrVector(subType.getBasicType()));

			// Vertex: assign from attribute.
			vtx << "\t" << name << vecIter << " = " << attribName << ";\n";

			// Fragment: add to res variable.
			int scalarSize = glu::getDataTypeScalarSize(subType.getBasicType());

			frag << "\tres += ";
			if (scalarSize == 1)		frag << "vec4(" << name << vecIter << ")";
			else if (scalarSize == 2)	frag << "vec2(" << name << vecIter << ").xxyy";
			else if (scalarSize == 3)	frag << "vec3(" << name << vecIter << ").xyzx";
			else if (scalarSize == 4)	frag << "vec4(" << name << vecIter << ")";

			frag << ";\n";
		}
	}

	frag << "\to_color = res * u_scale + u_bias;\n";

	vtx << "}\n";
	frag << "}\n";

	vertSource = vtx.str();
	fragSource = frag.str();
}

static glu::ShaderProgram* createVertexCaptureProgram (const glu::RenderContext& context, const ProgramSpec& spec, deUint32 bufferMode, deUint32 primitiveType)
{
	std::string vertSource, fragSource;

	genShaderSources(spec, vertSource, fragSource, primitiveType == GL_POINTS /* Is point size required? */);

	return new glu::ShaderProgram(context, glu::ProgramSources()
										   << glu::VertexSource(vertSource)
										   << glu::FragmentSource(fragSource)
										   << glu::TransformFeedbackVaryings<vector<string>::const_iterator>(spec.getTransformFeedbackVaryings().begin(), spec.getTransformFeedbackVaryings().end())
										   << glu::TransformFeedbackMode(bufferMode));
}

// Helpers.

static void computeInputLayout (vector<Attribute>& attributes, int& inputStride, const vector<Varying>& varyings, bool usePointSize)
{
	inputStride = 0;

	// Add position.
	attributes.push_back(Attribute("a_position", glu::VarType(glu::TYPE_FLOAT_VEC4, glu::PRECISION_HIGHP), inputStride));
	inputStride += 4*sizeof(deUint32);

	if (usePointSize)
	{
		attributes.push_back(Attribute("a_pointSize", glu::VarType(glu::TYPE_FLOAT, glu::PRECISION_HIGHP), inputStride));
		inputStride += 1*sizeof(deUint32);
	}

	// Compute attribute vector.
	for (vector<Varying>::const_iterator var = varyings.begin(); var != varyings.end(); var++)
	{
		for (glu::VectorTypeIterator vecIter = glu::VectorTypeIterator::begin(&var->type); vecIter != glu::VectorTypeIterator::end(&var->type); vecIter++)
		{
			glu::VarType	type	= vecIter.getType();
			string			name	= getAttributeName(var->name.c_str(), vecIter.getPath());

			attributes.push_back(Attribute(name, type, inputStride));
			inputStride += glu::getDataTypeScalarSize(type.getBasicType())*sizeof(deUint32);
		}
	}
}

static void computeTransformFeedbackOutputs (vector<Output>& transformFeedbackOutputs, const vector<Attribute>& attributes, const vector<Varying>& varyings, const vector<string>& transformFeedbackVaryings, deUint32 bufferMode)
{
	int accumulatedSize = 0;

	transformFeedbackOutputs.resize(transformFeedbackVaryings.size());
	for (int varNdx = 0; varNdx < (int)transformFeedbackVaryings.size(); varNdx++)
	{
		const string&	name		= transformFeedbackVaryings[varNdx];
		int				bufNdx		= (bufferMode == GL_SEPARATE_ATTRIBS ? varNdx : 0);
		int				offset		= (bufferMode == GL_SEPARATE_ATTRIBS ? 0 : accumulatedSize);
		Output&			output		= transformFeedbackOutputs[varNdx];

		output.name			= name;
		output.bufferNdx	= bufNdx;
		output.offset		= offset;

		if (name == "gl_Position")
		{
			const Attribute* posIn = &(*std::find_if(attributes.begin(), attributes.end(), AttributeNameEquals("a_position")));
			output.type = posIn->type;
			output.inputs.push_back(posIn);
		}
		else if (name == "gl_PointSize")
		{
			const Attribute* sizeIn = &(*std::find_if(attributes.begin(), attributes.end(), AttributeNameEquals("a_pointSize")));
			output.type = sizeIn->type;
			output.inputs.push_back(sizeIn);
		}
		else
		{
			string						varName		= glu::parseVariableName(name.c_str());
			const Varying&				varying		= *std::find_if(varyings.begin(), varyings.end(), VaryingNameEquals(varName));
			glu::TypeComponentVector	varPath;

			glu::parseTypePath(name.c_str(), varying.type, varPath);

			output.type = glu::getVarType(varying.type, varPath);

			// Add all vectorized attributes as inputs.
			for (glu::VectorTypeIterator iter = glu::VectorTypeIterator::begin(&output.type); iter != glu::VectorTypeIterator::end(&output.type); iter++)
			{
				// Full path.
				glu::TypeComponentVector fullPath(varPath.size() + iter.getPath().size());

				std::copy(varPath.begin(), varPath.end(), fullPath.begin());
				std::copy(iter.getPath().begin(), iter.getPath().end(), fullPath.begin()+varPath.size());

				string				attribName	= getAttributeName(varName.c_str(), fullPath);
				const Attribute*	attrib		= &(*std::find_if(attributes.begin(), attributes.end(), AttributeNameEquals(attribName)));

				output.inputs.push_back(attrib);
			}
		}

		accumulatedSize += output.type.getScalarSize()*sizeof(deUint32);
	}
}

static void genAttributeData (const Attribute& attrib, deUint8* basePtr, int stride, int numElements, de::Random& rnd)
{
	const int		elementSize	= (int)sizeof(deUint32);
	bool			isFloat		= glu::isDataTypeFloatOrVec(attrib.type.getBasicType());
	bool			isInt		= glu::isDataTypeIntOrIVec(attrib.type.getBasicType());
	bool			isUint		= glu::isDataTypeIntOrIVec(attrib.type.getBasicType());
	glu::Precision	precision	= attrib.type.getPrecision();
	int				numComps	= glu::getDataTypeScalarSize(attrib.type.getBasicType());

	for (int elemNdx = 0; elemNdx < numElements; elemNdx++)
	{
		for (int compNdx = 0; compNdx < numComps; compNdx++)
		{
			int offset = attrib.offset+elemNdx*stride+compNdx*elementSize;
			if (isFloat)
			{
				float* comp = (float*)(basePtr+offset);
				switch (precision)
				{
					case glu::PRECISION_LOWP:		*comp = 0.0f + 0.25f*(float)rnd.getInt(0, 4);	break;
					case glu::PRECISION_MEDIUMP:	*comp = rnd.getFloat(-1e3f, 1e3f);				break;
					case glu::PRECISION_HIGHP:		*comp = rnd.getFloat(-1e5f, 1e5f);				break;
					default:
						DE_ASSERT(false);
				}
			}
			else if (isInt)
			{
				int* comp = (int*)(basePtr+offset);
				switch (precision)
				{
					case glu::PRECISION_LOWP:		*comp = (int)(rnd.getUint32()&0xff) << 24 >> 24;	break;
					case glu::PRECISION_MEDIUMP:	*comp = (int)(rnd.getUint32()&0xffff) << 16 >> 16;	break;
					case glu::PRECISION_HIGHP:		*comp = (int)rnd.getUint32();						break;
					default:
						DE_ASSERT(false);
				}
			}
			else if (isUint)
			{
				deUint32* comp = (deUint32*)(basePtr+offset);
				switch (precision)
				{
					case glu::PRECISION_LOWP:		*comp = rnd.getUint32()&0xff;	break;
					case glu::PRECISION_MEDIUMP:	*comp = rnd.getUint32()&0xffff;	break;
					case glu::PRECISION_HIGHP:		*comp = rnd.getUint32();		break;
					default:
						DE_ASSERT(false);
				}
			}
		}
	}
}

static void genInputData (const vector<Attribute>& attributes, int numInputs, int inputStride, deUint8* inputBasePtr, de::Random& rnd)
{
	// Random positions.
	const Attribute& position = *std::find_if(attributes.begin(), attributes.end(), AttributeNameEquals("a_position"));

	for (int ndx = 0; ndx < numInputs; ndx++)
	{
		deUint8* ptr = inputBasePtr + position.offset + inputStride*ndx;
		*((float*)(ptr+ 0)) = rnd.getFloat(-1.2f, 1.2f);
		*((float*)(ptr+ 4)) = rnd.getFloat(-1.2f, 1.2f);
		*((float*)(ptr+ 8)) = rnd.getFloat(-1.2f, 1.2f);
		*((float*)(ptr+12)) = rnd.getFloat(0.1f, 2.0f);
	}

	// Point size.
	vector<Attribute>::const_iterator pointSizePos = std::find_if(attributes.begin(), attributes.end(), AttributeNameEquals("a_pointSize"));
	if (pointSizePos != attributes.end())
	{
		for (int ndx = 0; ndx < numInputs; ndx++)
		{
			deUint8* ptr = inputBasePtr + pointSizePos->offset + inputStride*ndx;
			*((float*)ptr) = rnd.getFloat(1.0f, 8.0f);
		}
	}

	// Random data for rest of components.
	for (vector<Attribute>::const_iterator attrib = attributes.begin(); attrib != attributes.end(); attrib++)
	{
		if (attrib->name == "a_position" || attrib->name == "a_pointSize")
			continue;

		genAttributeData(*attrib, inputBasePtr, inputStride, numInputs, rnd);
	}
}

static deUint32 getTransformFeedbackOutputCount (deUint32 primitiveType, int numElements)
{
	switch (primitiveType)
	{
		case GL_TRIANGLES:			return numElements - numElements%3;
		case GL_TRIANGLE_STRIP:		return de::max(0, numElements-2)*3;
		case GL_TRIANGLE_FAN:		return de::max(0, numElements-2)*3;
		case GL_LINES:				return numElements - numElements%2;
		case GL_LINE_STRIP:			return de::max(0, numElements-1)*2;
		case GL_LINE_LOOP:			return numElements > 1 ? numElements*2 : 0;
		case GL_POINTS:				return numElements;

		default:
			DE_ASSERT(false);
			return 0;
	}
}

static deUint32 getTransformFeedbackPrimitiveCount (deUint32 primitiveType, int numElements)
{
	switch (primitiveType)
	{
		case GL_TRIANGLES:			return numElements/3;
		case GL_TRIANGLE_STRIP:		return de::max(0, numElements-2);
		case GL_TRIANGLE_FAN:		return de::max(0, numElements-2);
		case GL_LINES:				return numElements/2;
		case GL_LINE_STRIP:			return de::max(0, numElements-1);
		case GL_LINE_LOOP:			return numElements > 1 ? numElements : 0;
		case GL_POINTS:				return numElements;

		default:
			DE_ASSERT(false);
			return 0;
	}
}

static deUint32 getTransformFeedbackPrimitiveMode (deUint32 primitiveType)
{
	switch (primitiveType)
	{
		case GL_TRIANGLES:
		case GL_TRIANGLE_STRIP:
		case GL_TRIANGLE_FAN:
			return GL_TRIANGLES;

		case GL_LINES:
		case GL_LINE_LOOP:
		case GL_LINE_STRIP:
			return GL_LINES;

		case GL_POINTS:
			return GL_POINTS;

		default:
			DE_ASSERT(false);
			return 0;
	}
}

static int getAttributeIndex (deUint32 primitiveType, int numInputs, int outNdx)
{
	switch (primitiveType)
	{
		case GL_TRIANGLES:			return outNdx;
		case GL_LINES:				return outNdx;
		case GL_POINTS:				return outNdx;

		case GL_TRIANGLE_STRIP:
		{
			int triNdx = outNdx/3;
			int vtxNdx = outNdx%3;
			return (triNdx%2 != 0 && vtxNdx < 2) ? (triNdx+1-vtxNdx) : (triNdx+vtxNdx);
		}

		case GL_TRIANGLE_FAN:
			return (outNdx%3 != 0) ? (outNdx/3 + outNdx%3) : 0;

		case GL_LINE_STRIP:
			return outNdx/2 + outNdx%2;

		case GL_LINE_LOOP:
		{
			int inNdx = outNdx/2 + outNdx%2;
			return inNdx < numInputs ? inNdx : 0;
		}

		default:
			DE_ASSERT(false);
			return 0;
	}
}

static bool compareTransformFeedbackOutput (tcu::TestLog& log, deUint32 primitiveType, const Output& output, int numInputs, const deUint8* inBasePtr, int inStride, const deUint8* outBasePtr, int outStride)
{
	bool		isOk		= true;
	int			outOffset	= output.offset;

	for (int attrNdx = 0; attrNdx < (int)output.inputs.size(); attrNdx++)
	{
		const Attribute&	attribute		= *output.inputs[attrNdx];
		glu::DataType		type			= attribute.type.getBasicType();
		int					numComponents	= glu::getDataTypeScalarSize(type);
		glu::Precision		precision		= attribute.type.getPrecision();
		glu::DataType		scalarType		= glu::getDataTypeScalarType(type);
		int					numOutputs		= getTransformFeedbackOutputCount(primitiveType, numInputs);

		for (int outNdx = 0; outNdx < numOutputs; outNdx++)
		{
			int inNdx = getAttributeIndex(primitiveType, numInputs, outNdx);

			for (int compNdx = 0; compNdx < numComponents; compNdx++)
			{
				const deUint8*	inPtr	= inBasePtr + inStride*inNdx + attribute.offset + compNdx*sizeof(deUint32);
				const deUint8*	outPtr	= outBasePtr + outStride*outNdx + outOffset + compNdx*sizeof(deUint32);
				deUint32		inVal	= *(const deUint32*)inPtr;
				deUint32		outVal	= *(const deUint32*)outPtr;
				bool			isEqual	= false;

				if (scalarType == glu::TYPE_FLOAT)
				{
					// ULP comparison is used for highp and mediump. Lowp uses threshold-comparison.
					switch (precision)
					{
						case glu::PRECISION_HIGHP:		isEqual = de::abs((int)inVal - (int)outVal) < 2;				break;
						case glu::PRECISION_MEDIUMP:	isEqual = de::abs((int)inVal - (int)outVal) < 2+(1<<13);		break;
						case glu::PRECISION_LOWP:
						{
							float inF	= *(const float*)inPtr;
							float outF	= *(const float*)outPtr;
							isEqual = de::abs(inF - outF) < 0.1f;
							break;
						}
						default:
							DE_ASSERT(false);
					}
				}
				else
					isEqual = (inVal == outVal); // Bit-exact match required for integer types.

				if (!isEqual)
				{
					log << TestLog::Message << "Mismatch in " << output.name << " (" << attribute.name << "), output = " << outNdx << ", input = " << inNdx << ", component = " << compNdx << TestLog::EndMessage;
					isOk = false;
					break;
				}
			}

			if (!isOk)
				break;
		}

		if (!isOk)
			break;

		outOffset += numComponents*sizeof(deUint32);
	}

	return isOk;
}

static int computeTransformFeedbackPrimitiveCount (deUint32 primitiveType, const DrawCall* first, const DrawCall* end)
{
	int primCount = 0;

	for (const DrawCall* call = first; call != end; ++call)
	{
		if (call->transformFeedbackEnabled)
			primCount += getTransformFeedbackPrimitiveCount(primitiveType, call->numElements);
	}

	return primCount;
}

static void writeBufferGuard (const glw::Functions& gl, deUint32 target, int bufferSize, int guardSize)
{
	deUint8* ptr = (deUint8*)gl.mapBufferRange(target, bufferSize, guardSize, GL_MAP_WRITE_BIT);
	if (ptr)
		deMemset(ptr, 0xcd, guardSize);
	gl.unmapBuffer(target);
	GLU_EXPECT_NO_ERROR(gl.getError(), "guardband write");
}

static bool verifyGuard (const deUint8* ptr, int guardSize)
{
	for (int ndx = 0; ndx < guardSize; ndx++)
	{
		if (ptr[ndx] != 0xcd)
			return false;
	}
	return true;
}

static void logTransformFeedbackVaryings (TestLog& log, const glw::Functions& gl, deUint32 program)
{
	int numTfVaryings	= 0;
	int	maxNameLen		= 0;

	gl.getProgramiv(program, GL_TRANSFORM_FEEDBACK_VARYINGS, &numTfVaryings);
	gl.getProgramiv(program, GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH, &maxNameLen);
	GLU_EXPECT_NO_ERROR(gl.getError(), "Query TF varyings");

	log << TestLog::Message << "GL_TRANSFORM_FEEDBACK_VARYINGS = " << numTfVaryings << TestLog::EndMessage;

	vector<char> nameBuf(maxNameLen+1);

	for (int ndx = 0; ndx < numTfVaryings; ndx++)
	{
		glw::GLsizei	size	= 0;
		glw::GLenum		type	= 0;

		gl.getTransformFeedbackVarying(program, ndx, (glw::GLsizei)nameBuf.size(), DE_NULL, &size, &type, &nameBuf[0]);
		GLU_EXPECT_NO_ERROR(gl.getError(), "glGetTransformFeedbackVarying()");

		const glu::DataType	dataType	= glu::getDataTypeFromGLType(type);
		const std::string	typeName	= dataType != glu::TYPE_LAST ? std::string(glu::getDataTypeName(dataType))
																	 : (std::string("unknown(") + tcu::toHex(type).toString() + ")");

		log << TestLog::Message << (const char*)&nameBuf[0] << ": " << typeName << "[" << size << "]" << TestLog::EndMessage;
	}
}

class TransformFeedbackCase : public TestCase
{
public:
								TransformFeedbackCase		(Context& context, const char* name, const char* desc, deUint32 bufferMode, deUint32 primitiveType);
								~TransformFeedbackCase		(void);

	void						init						(void);
	void						deinit						(void);
	IterateResult				iterate						(void);

protected:
	ProgramSpec					m_progSpec;
	deUint32					m_bufferMode;
	deUint32					m_primitiveType;

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

	bool						runTest						(const DrawCall* first, const DrawCall* end, deUint32 seed);

	// Derived from ProgramSpec in init()
	int							m_inputStride;
	vector<Attribute>			m_attributes;
	vector<Output>				m_transformFeedbackOutputs;
	vector<int>					m_bufferStrides;

	// GL state.
	glu::ShaderProgram*			m_program;
	glu::TransformFeedback*		m_transformFeedback;
	vector<deUint32>			m_outputBuffers;

	int							m_iterNdx;
};

TransformFeedbackCase::TransformFeedbackCase (Context& context, const char* name, const char* desc, deUint32 bufferMode, deUint32 primitiveType)
	: TestCase				(context, name, desc)
	, m_bufferMode			(bufferMode)
	, m_primitiveType		(primitiveType)
	, m_inputStride			(0)
	, m_program				(DE_NULL)
	, m_transformFeedback	(DE_NULL)
	, m_iterNdx				(0)
{
}

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

static bool hasArraysInTFVaryings (const ProgramSpec& spec)
{
	for (vector<string>::const_iterator tfVar = spec.getTransformFeedbackVaryings().begin(); tfVar != spec.getTransformFeedbackVaryings().end(); ++tfVar)
	{
		string							varName	= glu::parseVariableName(tfVar->c_str());
		vector<Varying>::const_iterator	varIter	= std::find_if(spec.getVaryings().begin(), spec.getVaryings().end(), VaryingNameEquals(varName));

		if (varName == "gl_Position" || varName == "gl_PointSize")
			continue;

		DE_ASSERT(varIter != spec.getVaryings().end());

		if (varIter->type.isArrayType())
			return true;
	}

	return false;
}

void TransformFeedbackCase::init (void)
{
	TestLog&				log	= m_testCtx.getLog();
	const glw::Functions&	gl	= m_context.getRenderContext().getFunctions();

	DE_ASSERT(!m_program);
	m_program = createVertexCaptureProgram(m_context.getRenderContext(), m_progSpec, m_bufferMode, m_primitiveType);

	log << *m_program;
	if (!m_program->isOk())
	{
		const bool linkFail = m_program->getShaderInfo(glu::SHADERTYPE_VERTEX).compileOk &&
							  m_program->getShaderInfo(glu::SHADERTYPE_FRAGMENT).compileOk &&
							  !m_program->getProgramInfo().linkOk;

		if (linkFail)
		{
			if (!isProgramSupported(gl, m_progSpec, m_bufferMode))
				throw tcu::NotSupportedError("Implementation limits execeeded", "", __FILE__, __LINE__);
			else if (hasArraysInTFVaryings(m_progSpec))
				throw tcu::NotSupportedError("Capturing arrays is not supported (undefined in specification)", "", __FILE__, __LINE__);
			else
				throw tcu::TestError("Link failed", "", __FILE__, __LINE__);
		}
		else
			throw tcu::TestError("Compile failed", "", __FILE__, __LINE__);
	}

	log << TestLog::Message << "Transform feedback varyings: " << tcu::formatArray(m_progSpec.getTransformFeedbackVaryings().begin(), m_progSpec.getTransformFeedbackVaryings().end()) << TestLog::EndMessage;

	// Print out transform feedback points reported by GL.
	log << TestLog::Message << "Transform feedback varyings reported by compiler:" << TestLog::EndMessage;
	logTransformFeedbackVaryings(log, gl, m_program->getProgram());

	// Compute input specification.
	computeInputLayout(m_attributes, m_inputStride, m_progSpec.getVaryings(), m_progSpec.isPointSizeUsed());

	// Build list of varyings used in transform feedback.
	computeTransformFeedbackOutputs(m_transformFeedbackOutputs, m_attributes, m_progSpec.getVaryings(), m_progSpec.getTransformFeedbackVaryings(), m_bufferMode);
	DE_ASSERT(!m_transformFeedbackOutputs.empty());

	// Buffer strides.
	DE_ASSERT(m_bufferStrides.empty());
	if (m_bufferMode == GL_SEPARATE_ATTRIBS)
	{
		for (vector<Output>::const_iterator outIter = m_transformFeedbackOutputs.begin(); outIter != m_transformFeedbackOutputs.end(); outIter++)
			m_bufferStrides.push_back(outIter->type.getScalarSize()*sizeof(deUint32));
	}
	else
	{
		int totalSize = 0;
		for (vector<Output>::const_iterator outIter = m_transformFeedbackOutputs.begin(); outIter != m_transformFeedbackOutputs.end(); outIter++)
			totalSize += outIter->type.getScalarSize()*sizeof(deUint32);

		m_bufferStrides.push_back(totalSize);
	}

	// \note Actual storage is allocated in iterate().
	m_outputBuffers.resize(m_bufferStrides.size());
	gl.genBuffers((glw::GLsizei)m_outputBuffers.size(), &m_outputBuffers[0]);

	DE_ASSERT(!m_transformFeedback);
	m_transformFeedback = new glu::TransformFeedback(m_context.getRenderContext());

	GLU_EXPECT_NO_ERROR(gl.getError(), "init");

	m_iterNdx = 0;
	m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
}

void TransformFeedbackCase::deinit (void)
{
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	if (!m_outputBuffers.empty())
	{
		gl.deleteBuffers((glw::GLsizei)m_outputBuffers.size(), &m_outputBuffers[0]);
		m_outputBuffers.clear();
	}

	delete m_transformFeedback;
	m_transformFeedback = DE_NULL;

	delete m_program;
	m_program = DE_NULL;

	// Clean up state.
	m_attributes.clear();
	m_transformFeedbackOutputs.clear();
	m_bufferStrides.clear();
	m_inputStride = 0;
}

TransformFeedbackCase::IterateResult TransformFeedbackCase::iterate (void)
{
	// Test cases.
	static const DrawCall s_elemCount1[]	= { DrawCall(1, true) };
	static const DrawCall s_elemCount2[]	= { DrawCall(2, true) };
	static const DrawCall s_elemCount3[]	= { DrawCall(3, true) };
	static const DrawCall s_elemCount4[]	= { DrawCall(4, true) };
	static const DrawCall s_elemCount123[]	= { DrawCall(123, true) };
	static const DrawCall s_basicPause1[]	= { DrawCall(64, true), DrawCall(64, false), DrawCall(64, true) };
	static const DrawCall s_basicPause2[]	= { DrawCall(13, true), DrawCall(5, true), DrawCall(17, false), DrawCall(3, true), DrawCall(7, false) };
	static const DrawCall s_startPaused[]	= { DrawCall(123, false), DrawCall(123, true) };
	static const DrawCall s_random1[]		= { DrawCall(65, true), DrawCall(135, false), DrawCall(74, true), DrawCall(16, false), DrawCall(226, false), DrawCall(9, true), DrawCall(174, false) };
	static const DrawCall s_random2[]		= { DrawCall(217, true), DrawCall(171, true), DrawCall(147, true), DrawCall(152, false), DrawCall(55, true) };

	static const struct
	{
		const DrawCall*		calls;
		int					numCalls;
	} s_iterations[] =
	{
#define ITER(ARR) { ARR, DE_LENGTH_OF_ARRAY(ARR) }
		ITER(s_elemCount1),
		ITER(s_elemCount2),
		ITER(s_elemCount3),
		ITER(s_elemCount4),
		ITER(s_elemCount123),
		ITER(s_basicPause1),
		ITER(s_basicPause2),
		ITER(s_startPaused),
		ITER(s_random1),
		ITER(s_random2)
#undef ITER
	};

	TestLog&				log				= m_testCtx.getLog();
	bool					isOk			= true;
	deUint32				seed			= deStringHash(getName()) ^ deInt32Hash(m_iterNdx);
	int						numIterations	= DE_LENGTH_OF_ARRAY(s_iterations);
	const DrawCall*			first			= s_iterations[m_iterNdx].calls;
	const DrawCall*			end				= s_iterations[m_iterNdx].calls + s_iterations[m_iterNdx].numCalls;

	std::string				sectionName		= std::string("Iteration") + de::toString(m_iterNdx+1);
	std::string				sectionDesc		= std::string("Iteration ") + de::toString(m_iterNdx+1) + " / " + de::toString(numIterations);
	tcu::ScopedLogSection	section			(log, sectionName, sectionDesc);

	log << TestLog::Message << "Testing " << s_iterations[m_iterNdx].numCalls << " draw calls, (element count, TF state): " << tcu::formatArray(first, end) << TestLog::EndMessage;

	isOk = runTest(first, end, seed);

	if (!isOk)
		m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Result comparison failed");

	m_iterNdx += 1;
	return (isOk && m_iterNdx < numIterations) ? CONTINUE : STOP;
}

bool TransformFeedbackCase::runTest (const DrawCall* first, const DrawCall* end, deUint32 seed)
{
	TestLog&				log				= m_testCtx.getLog();
	const glw::Functions&	gl				= m_context.getRenderContext().getFunctions();
	de::Random				rnd				(seed);
	int						numInputs		= 0;		//!< Sum of element counts in calls.
	int						numOutputs		= 0;		//!< Sum of output counts for calls that have transform feedback enabled.
	int						width			= m_context.getRenderContext().getRenderTarget().getWidth();
	int						height			= m_context.getRenderContext().getRenderTarget().getHeight();
	int						viewportW		= de::min((int)VIEWPORT_WIDTH, width);
	int						viewportH		= de::min((int)VIEWPORT_HEIGHT, height);
	int						viewportX		= rnd.getInt(0, width-viewportW);
	int						viewportY		= rnd.getInt(0, height-viewportH);
	tcu::Surface			frameWithTf		(viewportW, viewportH);
	tcu::Surface			frameWithoutTf	(viewportW, viewportH);
	glu::Query				primitiveQuery	(m_context.getRenderContext());
	bool					outputsOk		= true;
	bool					imagesOk		= true;
	bool					queryOk			= true;

	// Compute totals.
	for (const DrawCall* call = first; call != end; call++)
	{
		numInputs	+= call->numElements;
		numOutputs	+= call->transformFeedbackEnabled ? getTransformFeedbackOutputCount(m_primitiveType, call->numElements) : 0;
	}

	// Input data.
	vector<deUint8> inputData(m_inputStride*numInputs);
	genInputData(m_attributes, numInputs, m_inputStride, &inputData[0], rnd);

	gl.bindTransformFeedback(GL_TRANSFORM_FEEDBACK, m_transformFeedback->get());
	GLU_EXPECT_NO_ERROR(gl.getError(), "glBindTransformFeedback()");

	// Allocate storage for transform feedback output buffers and bind to targets.
	for (int bufNdx = 0; bufNdx < (int)m_outputBuffers.size(); bufNdx++)
	{
		deUint32		buffer		= m_outputBuffers[bufNdx];
		int				stride		= m_bufferStrides[bufNdx];
		int				target		= bufNdx;
		int				size		= stride*numOutputs;
		int				guardSize	= stride*BUFFER_GUARD_MULTIPLIER;
		const deUint32	usage		= GL_DYNAMIC_READ;

		gl.bindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, buffer);
		gl.bufferData(GL_TRANSFORM_FEEDBACK_BUFFER, size+guardSize, DE_NULL, usage);
		writeBufferGuard(gl, GL_TRANSFORM_FEEDBACK_BUFFER, size, guardSize);

		// \todo [2012-07-30 pyry] glBindBufferRange()?
		gl.bindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, target, buffer);

		GLU_EXPECT_NO_ERROR(gl.getError(), "transform feedback buffer setup");
	}

	// Setup attributes.
	for (vector<Attribute>::const_iterator attrib = m_attributes.begin(); attrib != m_attributes.end(); attrib++)
	{
		int				loc				= gl.getAttribLocation(m_program->getProgram(), attrib->name.c_str());
		glu::DataType	scalarType		= glu::getDataTypeScalarType(attrib->type.getBasicType());
		int				numComponents	= glu::getDataTypeScalarSize(attrib->type.getBasicType());
		const void*		ptr				= &inputData[0] + attrib->offset;

		if (loc >= 0)
		{
			gl.enableVertexAttribArray(loc);

			if (scalarType == glu::TYPE_FLOAT)		gl.vertexAttribPointer	(loc, numComponents, GL_FLOAT, GL_FALSE, m_inputStride, ptr);
			else if (scalarType == glu::TYPE_INT)	gl.vertexAttribIPointer	(loc, numComponents, GL_INT, m_inputStride, ptr);
			else if (scalarType == glu::TYPE_UINT)	gl.vertexAttribIPointer	(loc, numComponents, GL_UNSIGNED_INT, m_inputStride, ptr);
		}
	}

	// Setup viewport.
	gl.viewport(viewportX, viewportY, viewportW, viewportH);

	// Setup program.
	gl.useProgram(m_program->getProgram());

	gl.uniform4fv(gl.getUniformLocation(m_program->getProgram(), "u_scale"),	1, tcu::Vec4(0.01f).getPtr());
	gl.uniform4fv(gl.getUniformLocation(m_program->getProgram(), "u_bias"),		1, tcu::Vec4(0.5f).getPtr());

	// Enable query.
	gl.beginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, *primitiveQuery);
	GLU_EXPECT_NO_ERROR(gl.getError(), "glBeginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN)");

	// Draw.
	{
		int		offset		= 0;
		bool	tfEnabled	= true;

		gl.clear(GL_COLOR_BUFFER_BIT);

		gl.beginTransformFeedback(getTransformFeedbackPrimitiveMode(m_primitiveType));

		for (const DrawCall* call = first; call != end; call++)
		{
			// Pause or resume transform feedback if necessary.
			if (call->transformFeedbackEnabled != tfEnabled)
			{
				if (call->transformFeedbackEnabled)
					gl.resumeTransformFeedback();
				else
					gl.pauseTransformFeedback();
				tfEnabled = call->transformFeedbackEnabled;
			}

			gl.drawArrays(m_primitiveType, offset, call->numElements);
			offset += call->numElements;
		}

		// Resume feedback before finishing it.
		if (!tfEnabled)
			gl.resumeTransformFeedback();

		gl.endTransformFeedback();
		GLU_EXPECT_NO_ERROR(gl.getError(), "render");
	}

	gl.endQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN);
	GLU_EXPECT_NO_ERROR(gl.getError(), "glEndQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN)");

	// Check and log query status right after submit
	{
		deUint32 available = GL_FALSE;
		gl.getQueryObjectuiv(*primitiveQuery, GL_QUERY_RESULT_AVAILABLE, &available);
		GLU_EXPECT_NO_ERROR(gl.getError(), "glGetQueryObjectuiv()");

		log << TestLog::Message << "GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN status after submit: " << (available != GL_FALSE ? "GL_TRUE" : "GL_FALSE") << TestLog::EndMessage;
	}

	// Compare result buffers.
	for (int bufferNdx = 0; bufferNdx < (int)m_outputBuffers.size(); bufferNdx++)
	{
		deUint32		buffer		= m_outputBuffers[bufferNdx];
		int				stride		= m_bufferStrides[bufferNdx];
		int				size		= stride*numOutputs;
		int				guardSize	= stride*BUFFER_GUARD_MULTIPLIER;
		const void*		bufPtr		= DE_NULL;

		// Bind buffer for reading.
		gl.bindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, buffer);
		bufPtr = gl.mapBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, size+guardSize, GL_MAP_READ_BIT);
		GLU_EXPECT_NO_ERROR(gl.getError(), "mapping buffer");

		// Verify all output variables that are written to this buffer.
		for (vector<Output>::const_iterator out = m_transformFeedbackOutputs.begin(); out != m_transformFeedbackOutputs.end(); out++)
		{
			if (out->bufferNdx != bufferNdx)
				continue;

			int inputOffset		= 0;
			int	outputOffset	= 0;

			// Process all draw calls and check ones with transform feedback enabled.
			for (const DrawCall* call = first; call != end; call++)
			{
				if (call->transformFeedbackEnabled)
				{
					const deUint8*	inputPtr	= &inputData[0] + inputOffset*m_inputStride;
					const deUint8*	outputPtr	= (const deUint8*)bufPtr + outputOffset*stride;

					if (!compareTransformFeedbackOutput(log, m_primitiveType, *out, call->numElements, inputPtr, m_inputStride, outputPtr, stride))
					{
						outputsOk = false;
						break;
					}
				}

				inputOffset		+= call->numElements;
				outputOffset	+= call->transformFeedbackEnabled ? getTransformFeedbackOutputCount(m_primitiveType, call->numElements) : 0;
			}
		}

		// Verify guardband.
		if (!verifyGuard((const deUint8*)bufPtr + size, guardSize))
		{
			log << TestLog::Message << "Error: Transform feedback buffer overrun detected" << TestLog::EndMessage;
			outputsOk = false;
		}

		gl.unmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
	}

	// Check status after mapping buffers.
	{
		const bool	mustBeReady		= !m_outputBuffers.empty(); // Mapping buffer forces synchronization.
		const int	expectedCount	= computeTransformFeedbackPrimitiveCount(m_primitiveType, first, end);
		deUint32	available		= GL_FALSE;
		deUint32	numPrimitives	= 0;

		gl.getQueryObjectuiv(*primitiveQuery, GL_QUERY_RESULT_AVAILABLE, &available);
		gl.getQueryObjectuiv(*primitiveQuery, GL_QUERY_RESULT, &numPrimitives);
		GLU_EXPECT_NO_ERROR(gl.getError(), "glGetQueryObjectuiv()");

		if (!mustBeReady && available == GL_FALSE)
		{
			log << TestLog::Message << "ERROR: GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN result not available after mapping buffers!" << TestLog::EndMessage;
			queryOk = false;
		}

		log << TestLog::Message << "GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN = " << numPrimitives << TestLog::EndMessage;

		if ((int)numPrimitives != expectedCount)
		{
			log << TestLog::Message << "ERROR: Expected " << expectedCount << " primitives!" << TestLog::EndMessage;
			queryOk = false;
		}
	}

	// Clear transform feedback state.
	gl.bindTransformFeedback(GL_TRANSFORM_FEEDBACK, 0);
	for (int bufNdx = 0; bufNdx < (int)m_outputBuffers.size(); bufNdx++)
	{
		gl.bindBuffer		(GL_TRANSFORM_FEEDBACK_BUFFER, 0);
		gl.bindBufferBase	(GL_TRANSFORM_FEEDBACK_BUFFER, bufNdx, 0);
	}

	// Read back rendered image.
	glu::readPixels(m_context.getRenderContext(), viewportX, viewportY, frameWithTf.getAccess());

	// Render without transform feedback.
	{
		int offset = 0;

		gl.clear(GL_COLOR_BUFFER_BIT);

		for (const DrawCall* call = first; call != end; call++)
		{
			gl.drawArrays(m_primitiveType, offset, call->numElements);
			offset += call->numElements;
		}

		GLU_EXPECT_NO_ERROR(gl.getError(), "render");
		glu::readPixels(m_context.getRenderContext(), viewportX, viewportY, frameWithoutTf.getAccess());
	}

	// Compare images with and without transform feedback.
	imagesOk = tcu::pixelThresholdCompare(log, "Result", "Image comparison result", frameWithoutTf, frameWithTf, tcu::RGBA(1, 1, 1, 1), tcu::COMPARE_LOG_ON_ERROR);

	if (imagesOk)
		m_testCtx.getLog() << TestLog::Message << "Rendering result comparison between TF enabled and TF disabled passed." << TestLog::EndMessage;
	else
		m_testCtx.getLog() << TestLog::Message << "ERROR: Rendering result comparison between TF enabled and TF disabled failed!" << TestLog::EndMessage;

	return outputsOk && imagesOk && queryOk;
}

// Test cases.

class PositionCase : public TransformFeedbackCase
{
public:
	PositionCase (Context& context, const char* name, const char* desc, deUint32 bufferType, deUint32 primitiveType)
		: TransformFeedbackCase(context, name, desc, bufferType, primitiveType)
	{
		m_progSpec.addTransformFeedbackVarying("gl_Position");
	}
};

class PointSizeCase : public TransformFeedbackCase
{
public:
	PointSizeCase (Context& context, const char* name, const char* desc, deUint32 bufferType, deUint32 primitiveType)
		: TransformFeedbackCase(context, name, desc, bufferType, primitiveType)
	{
		m_progSpec.addTransformFeedbackVarying("gl_PointSize");
	}
};

class BasicTypeCase : public TransformFeedbackCase
{
public:
	BasicTypeCase (Context& context, const char* name, const char* desc, deUint32 bufferType, deUint32 primitiveType, glu::DataType type, glu::Precision precision, Interpolation interpolation)
		: TransformFeedbackCase(context, name, desc, bufferType, primitiveType)
	{
		m_progSpec.addVarying("v_varA", glu::VarType(type, precision), interpolation);
		m_progSpec.addVarying("v_varB", glu::VarType(type, precision), interpolation);

		m_progSpec.addTransformFeedbackVarying("v_varA");
		m_progSpec.addTransformFeedbackVarying("v_varB");
	}
};

class BasicArrayCase : public TransformFeedbackCase
{
public:
	BasicArrayCase (Context& context, const char* name, const char* desc, deUint32 bufferType, deUint32 primitiveType, glu::DataType type, glu::Precision precision, Interpolation interpolation)
		: TransformFeedbackCase(context, name, desc, bufferType, primitiveType)
	{
		if (glu::isDataTypeMatrix(type) || m_bufferMode == GL_SEPARATE_ATTRIBS)
		{
			// \note For matrix types we need to use reduced array sizes or otherwise we will exceed maximum attribute (16)
			//		 or transform feedback component count (64).
			//		 On separate attribs mode maximum component count per varying is 4.
			m_progSpec.addVarying("v_varA", glu::VarType(glu::VarType(type, precision), 1), interpolation);
			m_progSpec.addVarying("v_varB", glu::VarType(glu::VarType(type, precision), 2), interpolation);
		}
		else
		{
			m_progSpec.addVarying("v_varA", glu::VarType(glu::VarType(type, precision), 3), interpolation);
			m_progSpec.addVarying("v_varB", glu::VarType(glu::VarType(type, precision), 4), interpolation);
		}

		m_progSpec.addTransformFeedbackVarying("v_varA");
		m_progSpec.addTransformFeedbackVarying("v_varB");
	}
};

class ArrayElementCase : public TransformFeedbackCase
{
public:
	ArrayElementCase (Context& context, const char* name, const char* desc, deUint32 bufferType, deUint32 primitiveType, glu::DataType type, glu::Precision precision, Interpolation interpolation)
		: TransformFeedbackCase(context, name, desc, bufferType, primitiveType)
	{
		m_progSpec.addVarying("v_varA", glu::VarType(glu::VarType(type, precision), 3), interpolation);
		m_progSpec.addVarying("v_varB", glu::VarType(glu::VarType(type, precision), 4), interpolation);

		m_progSpec.addTransformFeedbackVarying("v_varA[1]");
		m_progSpec.addTransformFeedbackVarying("v_varB[0]");
		m_progSpec.addTransformFeedbackVarying("v_varB[3]");
	}
};

class RandomCase : public TransformFeedbackCase
{
public:
	RandomCase (Context& context, const char* name, const char* desc, deUint32 bufferType, deUint32 primitiveType, deUint32 seed)
		: TransformFeedbackCase	(context, name, desc, bufferType, primitiveType)
		, m_seed				(seed)
	{
	}

	void init (void)
	{
		// \note Hard-coded indices and hackery are used when indexing this, beware.
		static const glu::DataType typeCandidates[] =
		{
			glu::TYPE_FLOAT,
			glu::TYPE_FLOAT_VEC2,
			glu::TYPE_FLOAT_VEC3,
			glu::TYPE_FLOAT_VEC4,
			glu::TYPE_INT,
			glu::TYPE_INT_VEC2,
			glu::TYPE_INT_VEC3,
			glu::TYPE_INT_VEC4,
			glu::TYPE_UINT,
			glu::TYPE_UINT_VEC2,
			glu::TYPE_UINT_VEC3,
			glu::TYPE_UINT_VEC4,

			glu::TYPE_FLOAT_MAT2,
			glu::TYPE_FLOAT_MAT2X3,
			glu::TYPE_FLOAT_MAT2X4,

			glu::TYPE_FLOAT_MAT3X2,
			glu::TYPE_FLOAT_MAT3,
			glu::TYPE_FLOAT_MAT3X4,

			glu::TYPE_FLOAT_MAT4X2,
			glu::TYPE_FLOAT_MAT4X3,
			glu::TYPE_FLOAT_MAT4
		};

		static const glu::Precision precisions[] =
		{
			glu::PRECISION_LOWP,
			glu::PRECISION_MEDIUMP,
			glu::PRECISION_HIGHP
		};

		static const Interpolation interpModes[] =
		{
			INTERPOLATION_FLAT,
			INTERPOLATION_SMOOTH,
			INTERPOLATION_CENTROID
		};

		const int	maxAttributeVectors					= 16;
//		const int	maxTransformFeedbackComponents		= 64; // \note It is enough to limit attribute set size.
		bool		isSeparateMode						= m_bufferMode == GL_SEPARATE_ATTRIBS;
		int			maxTransformFeedbackVars			= isSeparateMode ? 4 : maxAttributeVectors;
		const float	arrayWeight							= 0.3f;
		const float	positionWeight						= 0.7f;
		const float	pointSizeWeight						= 0.1f;
		const float	captureFullArrayWeight				= 0.5f;

		de::Random	rnd									(m_seed);
		bool		usePosition							= rnd.getFloat() < positionWeight;
		bool		usePointSize						= rnd.getFloat() < pointSizeWeight;
		int			numAttribVectorsToUse				= rnd.getInt(1, maxAttributeVectors - 1/*position*/ - (usePointSize ? 1 : 0));

		int			numAttributeVectors					= 0;
		int			varNdx								= 0;

		// Generate varyings.
		while (numAttributeVectors < numAttribVectorsToUse)
		{
			int						maxVecs		= isSeparateMode ? de::min(2 /*at most 2*mat2*/, numAttribVectorsToUse-numAttributeVectors) : numAttribVectorsToUse-numAttributeVectors;
			const glu::DataType*	begin		= &typeCandidates[0];
			const glu::DataType*	end			= begin + (maxVecs >= 4 ? 21 :
														   maxVecs >= 3 ? 18 :
														   maxVecs >= 2 ? (isSeparateMode ? 13 : 15) : 12);

			glu::DataType			type		= rnd.choose<glu::DataType>(begin, end);
			glu::Precision			precision	= rnd.choose<glu::Precision>(&precisions[0], &precisions[0]+DE_LENGTH_OF_ARRAY(precisions));
			Interpolation			interp		= glu::getDataTypeScalarType(type) == glu::TYPE_FLOAT
												? rnd.choose<Interpolation>(&interpModes[0], &interpModes[0]+DE_LENGTH_OF_ARRAY(interpModes))
												: INTERPOLATION_FLAT;
			int						numVecs		= glu::isDataTypeMatrix(type) ? glu::getDataTypeMatrixNumColumns(type) : 1;
			int						numComps	= glu::getDataTypeScalarSize(type);
			int						maxArrayLen	= de::max(1, isSeparateMode ? 4/numComps : maxVecs/numVecs);
			bool					useArray	= rnd.getFloat() < arrayWeight;
			int						arrayLen	= useArray ? rnd.getInt(1, maxArrayLen) : 1;
			std::string				name		= "v_var" + de::toString(varNdx);

			if (useArray)
				m_progSpec.addVarying(name.c_str(), glu::VarType(glu::VarType(type, precision), arrayLen), interp);
			else
				m_progSpec.addVarying(name.c_str(), glu::VarType(type, precision), interp);

			numAttributeVectors	+= arrayLen*numVecs;
			varNdx				+= 1;
		}

		// Generate transform feedback candidate set.
		vector<string> tfCandidates;

		if (usePosition)	tfCandidates.push_back("gl_Position");
		if (usePointSize)	tfCandidates.push_back("gl_PointSize");

		for (int ndx = 0; ndx < varNdx /* num varyings */; ndx++)
		{
			const Varying& var = m_progSpec.getVaryings()[ndx];

			if (var.type.isArrayType())
			{
				const bool captureFull = rnd.getFloat() < captureFullArrayWeight;

				if (captureFull)
					tfCandidates.push_back(var.name);
				else
				{
					const int numElem = var.type.getArraySize();
					for (int elemNdx = 0; elemNdx < numElem; elemNdx++)
						tfCandidates.push_back(var.name + "[" + de::toString(elemNdx) + "]");
				}
			}
			else
				tfCandidates.push_back(var.name);
		}

		// Pick random selection.
		vector<string> tfVaryings(de::min((int)tfCandidates.size(), maxTransformFeedbackVars));
		rnd.choose(tfCandidates.begin(), tfCandidates.end(), tfVaryings.begin(), (int)tfVaryings.size());
		rnd.shuffle(tfVaryings.begin(), tfVaryings.end());

		for (vector<string>::const_iterator var = tfVaryings.begin(); var != tfVaryings.end(); var++)
			m_progSpec.addTransformFeedbackVarying(var->c_str());

		TransformFeedbackCase::init();
	}

private:
	deUint32 m_seed;
};

} // TransformFeedback

using namespace TransformFeedback;

TransformFeedbackTests::TransformFeedbackTests (Context& context)
	: TestCaseGroup(context, "transform_feedback", "Transform feedback tests")
{
}

TransformFeedbackTests::~TransformFeedbackTests (void)
{
}

void TransformFeedbackTests::init (void)
{
	static const struct
	{
		const char*		name;
		deUint32		mode;
	} bufferModes[] =
	{
		{ "separate",		GL_SEPARATE_ATTRIBS		},
		{ "interleaved",	GL_INTERLEAVED_ATTRIBS	}
	};

	static const struct
	{
		const char*		name;
		deUint32		type;
	} primitiveTypes[] =
	{
		{ "points",			GL_POINTS			},
		{ "lines",			GL_LINES			},
		{ "triangles",		GL_TRIANGLES		}

		// Not supported by GLES3.
//		{ "line_strip",		GL_LINE_STRIP		},
//		{ "line_loop",		GL_LINE_LOOP		},
//		{ "triangle_fan",	GL_TRIANGLE_FAN		},
//		{ "triangle_strip",	GL_TRIANGLE_STRIP	}
	};

	static const glu::DataType basicTypes[] =
	{
		glu::TYPE_FLOAT,
		glu::TYPE_FLOAT_VEC2,
		glu::TYPE_FLOAT_VEC3,
		glu::TYPE_FLOAT_VEC4,
		glu::TYPE_FLOAT_MAT2,
		glu::TYPE_FLOAT_MAT2X3,
		glu::TYPE_FLOAT_MAT2X4,
		glu::TYPE_FLOAT_MAT3X2,
		glu::TYPE_FLOAT_MAT3,
		glu::TYPE_FLOAT_MAT3X4,
		glu::TYPE_FLOAT_MAT4X2,
		glu::TYPE_FLOAT_MAT4X3,
		glu::TYPE_FLOAT_MAT4,
		glu::TYPE_INT,
		glu::TYPE_INT_VEC2,
		glu::TYPE_INT_VEC3,
		glu::TYPE_INT_VEC4,
		glu::TYPE_UINT,
		glu::TYPE_UINT_VEC2,
		glu::TYPE_UINT_VEC3,
		glu::TYPE_UINT_VEC4
	};

	static const glu::Precision precisions[] =
	{
		glu::PRECISION_LOWP,
		glu::PRECISION_MEDIUMP,
		glu::PRECISION_HIGHP
	};

	static const struct
	{
		const char*		name;
		Interpolation	interp;
	} interpModes[] =
	{
		{ "smooth",		INTERPOLATION_SMOOTH	},
		{ "flat",		INTERPOLATION_FLAT		},
		{ "centroid",	INTERPOLATION_CENTROID	}
	};

	// .position
	{
		tcu::TestCaseGroup* positionGroup = new tcu::TestCaseGroup(m_testCtx, "position", "gl_Position capture using transform feedback");
		addChild(positionGroup);

		for (int primitiveType = 0; primitiveType < DE_LENGTH_OF_ARRAY(primitiveTypes); primitiveType++)
		{
			for (int bufferMode = 0; bufferMode < DE_LENGTH_OF_ARRAY(bufferModes); bufferMode++)
			{
				string name = string(primitiveTypes[primitiveType].name) + "_" + bufferModes[bufferMode].name;
				positionGroup->addChild(new PositionCase(m_context, name.c_str(), "", bufferModes[bufferMode].mode, primitiveTypes[primitiveType].type));
			}
		}
	}

	// .point_size
	{
		tcu::TestCaseGroup* pointSizeGroup = new tcu::TestCaseGroup(m_testCtx, "point_size", "gl_PointSize capture using transform feedback");
		addChild(pointSizeGroup);

		for (int primitiveType = 0; primitiveType < DE_LENGTH_OF_ARRAY(primitiveTypes); primitiveType++)
		{
			for (int bufferMode = 0; bufferMode < DE_LENGTH_OF_ARRAY(bufferModes); bufferMode++)
			{
				string name = string(primitiveTypes[primitiveType].name) + "_" + bufferModes[bufferMode].name;
				pointSizeGroup->addChild(new PointSizeCase(m_context, name.c_str(), "", bufferModes[bufferMode].mode, primitiveTypes[primitiveType].type));
			}
		}
	}

	// .basic_type
	{
		tcu::TestCaseGroup* basicTypeGroup = new tcu::TestCaseGroup(m_testCtx, "basic_types", "Basic types in transform feedback");
		addChild(basicTypeGroup);

		for (int bufferModeNdx = 0; bufferModeNdx < DE_LENGTH_OF_ARRAY(bufferModes); bufferModeNdx++)
		{
			tcu::TestCaseGroup* modeGroup	= new tcu::TestCaseGroup(m_testCtx, bufferModes[bufferModeNdx].name, "");
			deUint32			bufferMode	= bufferModes[bufferModeNdx].mode;
			basicTypeGroup->addChild(modeGroup);

			for (int primitiveTypeNdx = 0; primitiveTypeNdx < DE_LENGTH_OF_ARRAY(primitiveTypes); primitiveTypeNdx++)
			{
				tcu::TestCaseGroup* primitiveGroup	= new tcu::TestCaseGroup(m_testCtx, primitiveTypes[primitiveTypeNdx].name, "");
				deUint32			primitiveType	= primitiveTypes[primitiveTypeNdx].type;
				modeGroup->addChild(primitiveGroup);

				for (int typeNdx = 0; typeNdx < DE_LENGTH_OF_ARRAY(basicTypes); typeNdx++)
				{
					glu::DataType		type		= basicTypes[typeNdx];
					bool				isFloat		= glu::getDataTypeScalarType(type) == glu::TYPE_FLOAT;

					for (int precNdx = 0; precNdx < DE_LENGTH_OF_ARRAY(precisions); precNdx++)
					{
						glu::Precision precision = precisions[precNdx];

						string name = string(glu::getPrecisionName(precision)) + "_" + glu::getDataTypeName(type);
						primitiveGroup->addChild(new BasicTypeCase(m_context, name.c_str(), "", bufferMode, primitiveType, type, precision, isFloat ? INTERPOLATION_SMOOTH : INTERPOLATION_FLAT));
					}
				}
			}
		}
	}

	// .array
	{
		tcu::TestCaseGroup* arrayGroup = new tcu::TestCaseGroup(m_testCtx, "array", "Capturing whole array in TF");
		addChild(arrayGroup);

		for (int bufferModeNdx = 0; bufferModeNdx < DE_LENGTH_OF_ARRAY(bufferModes); bufferModeNdx++)
		{
			tcu::TestCaseGroup* modeGroup	= new tcu::TestCaseGroup(m_testCtx, bufferModes[bufferModeNdx].name, "");
			deUint32			bufferMode	= bufferModes[bufferModeNdx].mode;
			arrayGroup->addChild(modeGroup);

			for (int primitiveTypeNdx = 0; primitiveTypeNdx < DE_LENGTH_OF_ARRAY(primitiveTypes); primitiveTypeNdx++)
			{
				tcu::TestCaseGroup* primitiveGroup	= new tcu::TestCaseGroup(m_testCtx, primitiveTypes[primitiveTypeNdx].name, "");
				deUint32			primitiveType	= primitiveTypes[primitiveTypeNdx].type;
				modeGroup->addChild(primitiveGroup);

				for (int typeNdx = 0; typeNdx < DE_LENGTH_OF_ARRAY(basicTypes); typeNdx++)
				{
					glu::DataType		type		= basicTypes[typeNdx];
					bool				isFloat		= glu::getDataTypeScalarType(type) == glu::TYPE_FLOAT;

					for (int precNdx = 0; precNdx < DE_LENGTH_OF_ARRAY(precisions); precNdx++)
					{
						glu::Precision precision = precisions[precNdx];

						string name = string(glu::getPrecisionName(precision)) + "_" + glu::getDataTypeName(type);
						primitiveGroup->addChild(new BasicArrayCase(m_context, name.c_str(), "", bufferMode, primitiveType, type, precision, isFloat ? INTERPOLATION_SMOOTH : INTERPOLATION_FLAT));
					}
				}
			}
		}
	}

	// .array_element
	{
		tcu::TestCaseGroup* arrayElemGroup = new tcu::TestCaseGroup(m_testCtx, "array_element", "Capturing single array element in TF");
		addChild(arrayElemGroup);

		for (int bufferModeNdx = 0; bufferModeNdx < DE_LENGTH_OF_ARRAY(bufferModes); bufferModeNdx++)
		{
			tcu::TestCaseGroup* modeGroup	= new tcu::TestCaseGroup(m_testCtx, bufferModes[bufferModeNdx].name, "");
			deUint32			bufferMode	= bufferModes[bufferModeNdx].mode;
			arrayElemGroup->addChild(modeGroup);

			for (int primitiveTypeNdx = 0; primitiveTypeNdx < DE_LENGTH_OF_ARRAY(primitiveTypes); primitiveTypeNdx++)
			{
				tcu::TestCaseGroup* primitiveGroup	= new tcu::TestCaseGroup(m_testCtx, primitiveTypes[primitiveTypeNdx].name, "");
				deUint32			primitiveType	= primitiveTypes[primitiveTypeNdx].type;
				modeGroup->addChild(primitiveGroup);

				for (int typeNdx = 0; typeNdx < DE_LENGTH_OF_ARRAY(basicTypes); typeNdx++)
				{
					glu::DataType		type		= basicTypes[typeNdx];
					bool				isFloat		= glu::getDataTypeScalarType(type) == glu::TYPE_FLOAT;

					for (int precNdx = 0; precNdx < DE_LENGTH_OF_ARRAY(precisions); precNdx++)
					{
						glu::Precision precision = precisions[precNdx];

						string name = string(glu::getPrecisionName(precision)) + "_" + glu::getDataTypeName(type);
						primitiveGroup->addChild(new ArrayElementCase(m_context, name.c_str(), "", bufferMode, primitiveType, type, precision, isFloat ? INTERPOLATION_SMOOTH : INTERPOLATION_FLAT));
					}
				}
			}
		}
	}

	// .interpolation
	{
		tcu::TestCaseGroup* interpolationGroup = new tcu::TestCaseGroup(m_testCtx, "interpolation", "Different interpolation modes in transform feedback varyings");
		addChild(interpolationGroup);

		for (int modeNdx = 0; modeNdx < DE_LENGTH_OF_ARRAY(interpModes); modeNdx++)
		{
			Interpolation		interp		= interpModes[modeNdx].interp;
			tcu::TestCaseGroup*	modeGroup	= new tcu::TestCaseGroup(m_testCtx, interpModes[modeNdx].name, "");

			interpolationGroup->addChild(modeGroup);

			for (int precNdx = 0; precNdx < DE_LENGTH_OF_ARRAY(precisions); precNdx++)
			{
				glu::Precision precision = precisions[precNdx];

				for (int primitiveType = 0; primitiveType < DE_LENGTH_OF_ARRAY(primitiveTypes); primitiveType++)
				{
					for (int bufferMode = 0; bufferMode < DE_LENGTH_OF_ARRAY(bufferModes); bufferMode++)
					{
						string name = string(glu::getPrecisionName(precision)) + "_vec4_" + primitiveTypes[primitiveType].name + "_" + bufferModes[bufferMode].name;
						modeGroup->addChild(new BasicTypeCase(m_context, name.c_str(), "", bufferModes[bufferMode].mode, primitiveTypes[primitiveType].type, glu::TYPE_FLOAT_VEC4, precision, interp));
					}
				}
			}
		}
	}

	// .random
	{
		tcu::TestCaseGroup* randomGroup = new tcu::TestCaseGroup(m_testCtx, "random", "Randomized transform feedback cases");
		addChild(randomGroup);

		for (int bufferModeNdx = 0; bufferModeNdx < DE_LENGTH_OF_ARRAY(bufferModes); bufferModeNdx++)
		{
			tcu::TestCaseGroup* modeGroup	= new tcu::TestCaseGroup(m_testCtx, bufferModes[bufferModeNdx].name, "");
			deUint32			bufferMode	= bufferModes[bufferModeNdx].mode;
			randomGroup->addChild(modeGroup);

			for (int primitiveTypeNdx = 0; primitiveTypeNdx < DE_LENGTH_OF_ARRAY(primitiveTypes); primitiveTypeNdx++)
			{
				tcu::TestCaseGroup* primitiveGroup	= new tcu::TestCaseGroup(m_testCtx, primitiveTypes[primitiveTypeNdx].name, "");
				deUint32			primitiveType	= primitiveTypes[primitiveTypeNdx].type;
				modeGroup->addChild(primitiveGroup);

				for (int ndx = 0; ndx < 10; ndx++)
				{
					deUint32 seed = deInt32Hash(bufferMode) ^ deInt32Hash(primitiveType) ^ deInt32Hash(ndx);
					primitiveGroup->addChild(new RandomCase(m_context, de::toString(ndx+1).c_str(), "", bufferMode, primitiveType, seed));
				}
			}
		}
	}
}

} // Functional
} // gles3
} // deqp