/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES 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 Memory object stress test
 *//*--------------------------------------------------------------------*/

#include "glsMemoryStressCase.hpp"
#include "gluShaderProgram.hpp"
#include "tcuTestLog.hpp"
#include "tcuCommandLine.hpp"
#include "deRandom.hpp"
#include "deClock.h"
#include "deString.h"

#include "glw.h"

#include <vector>
#include <iostream>

using std::vector;
using tcu::TestLog;

namespace deqp
{
namespace gls
{

static const char* glErrorToString (deUint32 error)
{
	switch (error)
	{
		case GL_OUT_OF_MEMORY:
			return "GL_OUT_OF_MEMORY";
			break;

		case GL_INVALID_ENUM:
			return "GL_INVALID_ENUM";
			break;

		case GL_INVALID_FRAMEBUFFER_OPERATION:
			return "GL_INVALID_FRAMEBUFFER_OPERATION";
			break;

		case GL_INVALID_OPERATION:
			return "GL_INVALID_OPERATION";
			break;

		case GL_INVALID_VALUE:
			return "GL_INVALID_VALUE";
			break;

		case 0:
			return "<none>";
			break;

		default:
			// \todo [mika] Handle uknown errors?
			DE_ASSERT(false);
			return NULL;
			break;
	}
}

static const float s_quadCoords[] =
{
	-1.0f, -1.0f,
	 1.0f, -1.0f,
	 1.0f,  1.0f,
	-1.0f,  1.0f
};

static const GLubyte s_quadIndices[] =
{
	0, 1, 2,
	2, 3, 0
};

class TextureRenderer
{
public:
			TextureRenderer		(tcu::TestLog& log, glu::RenderContext& renderContext);
			~TextureRenderer	(void);
	void	render				(deUint32 texture);

private:
	glu::ShaderProgram*	m_program;
	glu::RenderContext&	m_renderCtx;

	deUint32			m_coordBuffer;
	deUint32			m_indexBuffer;
	deUint32			m_vao;

	static const char*	s_vertexShaderGLES2;
	static const char*	s_fragmentShaderGLES2;

	static const char*	s_vertexShaderGLES3;
	static const char*	s_fragmentShaderGLES3;

	static const char*	s_vertexShaderGL3;
	static const char*	s_fragmentShaderGL3;
};

const char* TextureRenderer::s_vertexShaderGLES2 =
"attribute mediump vec2 a_coord;\n"
"varying mediump vec2 v_texCoord;\n"
"void main (void)\n"
"{\n"
"\tv_texCoord = 0.5 * (a_coord + vec2(1.0));\n"
"\tgl_Position = vec4(a_coord, 0.0, 1.0);\n"
"}\n";

const char* TextureRenderer::s_fragmentShaderGLES2 =
"varying mediump vec2 v_texCoord;\n"
"uniform sampler2D u_texture;\n"
"void main (void)\n"
"{\n"
"\tgl_FragColor = texture2D(u_texture, v_texCoord);\n"
"}\n";

const char* TextureRenderer::s_vertexShaderGLES3 =
"#version 300 es\n"
"in mediump vec2 a_coord;\n"
"out mediump vec2 v_texCoord;\n"
"void main (void)\n"
"{\n"
"\tv_texCoord = 0.5 * (a_coord + vec2(1.0));\n"
"\tgl_Position = vec4(a_coord, 0.0, 1.0);\n"
"}\n";

const char* TextureRenderer::s_fragmentShaderGLES3 =
"#version 300 es\n"
"in mediump vec2 v_texCoord;\n"
"uniform sampler2D u_texture;\n"
"layout(location = 0) out mediump vec4 dEQP_FragColor;\n"
"void main (void)\n"
"{\n"
"\tdEQP_FragColor = texture(u_texture, v_texCoord);\n"
"}\n";

const char* TextureRenderer::s_vertexShaderGL3 =
"#version 330\n"
"in mediump vec2 a_coord;\n"
"out mediump vec2 v_texCoord;\n"
"void main (void)\n"
"{\n"
"\tv_texCoord = 0.5 * (a_coord + vec2(1.0));\n"
"\tgl_Position = vec4(a_coord, 0.0, 1.0);\n"
"}\n";

const char* TextureRenderer::s_fragmentShaderGL3 =
"#version 330\n"
"in mediump vec2 v_texCoord;\n"
"uniform sampler2D u_texture;\n"
"layout(location = 0) out mediump vec4 dEQP_FragColor;\n"
"void main (void)\n"
"{\n"
"\tdEQP_FragColor = texture(u_texture, v_texCoord);\n"
"}\n";

TextureRenderer::TextureRenderer (tcu::TestLog& log, glu::RenderContext& renderContext)
	: m_program		(NULL)
	, m_renderCtx	(renderContext)
	, m_coordBuffer	(0)
	, m_indexBuffer	(0)
	, m_vao			(0)
{
	const glu::ContextType ctxType = renderContext.getType();

	if (glu::isGLSLVersionSupported(ctxType, glu::GLSL_VERSION_300_ES))
		m_program = new glu::ShaderProgram(m_renderCtx, glu::makeVtxFragSources(s_vertexShaderGLES3, s_fragmentShaderGLES3));
	else if (glu::isGLSLVersionSupported(ctxType, glu::GLSL_VERSION_100_ES))
		m_program = new glu::ShaderProgram(m_renderCtx, glu::makeVtxFragSources(s_vertexShaderGLES2, s_fragmentShaderGLES2));
	else if (glu::isGLSLVersionSupported(ctxType, glu::GLSL_VERSION_330))
		m_program = new glu::ShaderProgram(m_renderCtx, glu::makeVtxFragSources(s_vertexShaderGL3, s_fragmentShaderGL3));
	else
		DE_ASSERT(false);

	if (ctxType.getProfile() == glu::PROFILE_CORE)
		GLU_CHECK_CALL(glGenVertexArrays(1, &m_vao));

	GLU_CHECK_CALL(glGenBuffers(1, &m_coordBuffer));
	GLU_CHECK_CALL(glBindBuffer(GL_ARRAY_BUFFER, m_coordBuffer));
	GLU_CHECK_CALL(glBufferData(GL_ARRAY_BUFFER, sizeof(s_quadCoords), s_quadCoords, GL_STATIC_DRAW));

	GLU_CHECK_CALL(glGenBuffers(1, &m_indexBuffer));
	GLU_CHECK_CALL(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_indexBuffer));
	GLU_CHECK_CALL(glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(s_quadIndices), s_quadIndices, GL_STATIC_DRAW));

	if (!m_program->isOk())
	{
		log << *m_program;
		TCU_CHECK_MSG(m_program->isOk(), "Shader compilation failed");
	}
}

TextureRenderer::~TextureRenderer (void)
{
	delete m_program;
	glDeleteBuffers(1, &m_coordBuffer);
	glDeleteBuffers(1, &m_indexBuffer);
}

void TextureRenderer::render (deUint32 texture)
{
	deUint32 coordLoc = -1;
	deUint32 texLoc	= -1;

	GLU_CHECK_CALL(glUseProgram(m_program->getProgram()));

	coordLoc = glGetAttribLocation(m_program->getProgram(), "a_coord");
	GLU_CHECK();
	TCU_CHECK(coordLoc != (deUint32)-1);

	if (m_vao != 0)
		GLU_CHECK_CALL(glBindVertexArray(m_vao));

	GLU_CHECK_CALL(glEnableVertexAttribArray(coordLoc));

	GLU_CHECK_CALL(glBindBuffer(GL_ARRAY_BUFFER, m_coordBuffer));
	GLU_CHECK_CALL(glVertexAttribPointer(coordLoc, 2, GL_FLOAT, GL_FALSE, 0, NULL));

	GLU_CHECK_CALL(glActiveTexture(GL_TEXTURE0));
	GLU_CHECK_CALL(glBindTexture(GL_TEXTURE_2D, texture));

	texLoc = glGetUniformLocation(m_program->getProgram(), "u_texture");
	GLU_CHECK();
	TCU_CHECK(texLoc != (deUint32)-1);

	GLU_CHECK_CALL(glUniform1i(texLoc, 0));

	GLU_CHECK_CALL(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_indexBuffer));
	GLU_CHECK_CALL(glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, NULL));

	GLU_CHECK_CALL(glDisableVertexAttribArray(coordLoc));

	if (m_vao != 0)
		GLU_CHECK_CALL(glBindVertexArray(0));
}

class BufferRenderer
{
public:
			BufferRenderer	(tcu::TestLog& log, glu::RenderContext& renderContext);
			~BufferRenderer	(void);
	void	render			(deUint32 buffer, int size);

private:
	glu::ShaderProgram*	m_program;
	glu::RenderContext&	m_renderCtx;

	deUint32			m_coordBuffer;
	deUint32			m_indexBuffer;
	deUint32			m_vao;

	static const char*	s_vertexShaderGLES2;
	static const char*	s_fragmentShaderGLES2;

	static const char*	s_vertexShaderGLES3;
	static const char*	s_fragmentShaderGLES3;

	static const char*	s_vertexShaderGL3;
	static const char*	s_fragmentShaderGL3;
};

const char* BufferRenderer::s_vertexShaderGLES2 =
"attribute mediump vec2 a_coord;\n"
"attribute mediump vec4 a_buffer;\n"
"varying mediump vec4 v_buffer;\n"
"void main (void)\n"
"{\n"
"\tv_buffer = a_buffer;\n"
"\tgl_Position = vec4(a_coord, 0.0, 1.0);\n"
"}\n";

const char* BufferRenderer::s_fragmentShaderGLES2 =
"varying mediump vec4 v_buffer;\n"
"void main (void)\n"
"{\n"
"\tgl_FragColor = v_buffer;\n"
"}\n";

const char* BufferRenderer::s_vertexShaderGLES3 =
"#version 300 es\n"
"in mediump vec2 a_coord;\n"
"in mediump vec4 a_buffer;\n"
"out mediump vec4 v_buffer;\n"
"void main (void)\n"
"{\n"
"\tv_buffer = a_buffer;\n"
"\tgl_Position = vec4(a_coord, 0.0, 1.0);\n"
"}\n";

const char* BufferRenderer::s_fragmentShaderGLES3 =
"#version 300 es\n"
"in mediump vec4 v_buffer;\n"
"layout(location = 0) out mediump vec4 dEQP_FragColor;\n"
"void main (void)\n"
"{\n"
"\tdEQP_FragColor = v_buffer;\n"
"}\n";

const char* BufferRenderer::s_vertexShaderGL3 =
"#version 330\n"
"in mediump vec2 a_coord;\n"
"in mediump vec4 a_buffer;\n"
"out mediump vec4 v_buffer;\n"
"void main (void)\n"
"{\n"
"\tv_buffer = a_buffer;\n"
"\tgl_Position = vec4(a_coord, 0.0, 1.0);\n"
"}\n";

const char* BufferRenderer::s_fragmentShaderGL3 =
"#version 330\n"
"in mediump vec4 v_buffer;\n"
"layout(location = 0) out mediump vec4 dEQP_FragColor;\n"
"void main (void)\n"
"{\n"
"\tdEQP_FragColor = v_buffer;\n"
"}\n";

BufferRenderer::BufferRenderer (tcu::TestLog& log, glu::RenderContext& renderContext)
	: m_program		(NULL)
	, m_renderCtx	(renderContext)
	, m_coordBuffer	(0)
	, m_indexBuffer	(0)
	, m_vao			(0)
{
	const glu::ContextType ctxType = renderContext.getType();

	if (glu::isGLSLVersionSupported(ctxType, glu::GLSL_VERSION_300_ES))
		m_program = new glu::ShaderProgram(m_renderCtx, glu::makeVtxFragSources(s_vertexShaderGLES3, s_fragmentShaderGLES3));
	else if (glu::isGLSLVersionSupported(ctxType, glu::GLSL_VERSION_100_ES))
		m_program = new glu::ShaderProgram(m_renderCtx, glu::makeVtxFragSources(s_vertexShaderGLES2, s_fragmentShaderGLES2));
	else if (glu::isGLSLVersionSupported(ctxType, glu::GLSL_VERSION_330))
		m_program = new glu::ShaderProgram(m_renderCtx, glu::makeVtxFragSources(s_vertexShaderGL3, s_fragmentShaderGL3));
	else
		DE_ASSERT(false);

	if (ctxType.getProfile() == glu::PROFILE_CORE)
		GLU_CHECK_CALL(glGenVertexArrays(1, &m_vao));

	GLU_CHECK_CALL(glGenBuffers(1, &m_coordBuffer));
	GLU_CHECK_CALL(glBindBuffer(GL_ARRAY_BUFFER, m_coordBuffer));
	GLU_CHECK_CALL(glBufferData(GL_ARRAY_BUFFER, sizeof(s_quadCoords), s_quadCoords, GL_STATIC_DRAW));

	GLU_CHECK_CALL(glGenBuffers(1, &m_indexBuffer));
	GLU_CHECK_CALL(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_indexBuffer));
	GLU_CHECK_CALL(glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(s_quadIndices), s_quadIndices, GL_STATIC_DRAW));

	if (!m_program->isOk())
	{
		log << *m_program;
		TCU_CHECK_MSG(m_program->isOk(), "Shader compilation failed");
	}
}

BufferRenderer::~BufferRenderer (void)
{
	delete m_program;
	glDeleteBuffers(1, &m_coordBuffer);
	glDeleteBuffers(1, &m_indexBuffer);
}

void BufferRenderer::render (deUint32 buffer, int size)
{
	DE_UNREF(size);
	DE_ASSERT((size_t)size >= sizeof(GLubyte) * 4 * 6);
	GLU_CHECK_CALL(glUseProgram(m_program->getProgram()));

	deUint32 bufferLoc = glGetAttribLocation(m_program->getProgram(), "a_buffer");
	TCU_CHECK(bufferLoc != (deUint32)-1);

	deUint32 coordLoc = glGetAttribLocation(m_program->getProgram(), "a_coord");
	TCU_CHECK(coordLoc != (deUint32)-1);

	if (m_vao != 0)
		GLU_CHECK_CALL(glBindVertexArray(m_vao));

	GLU_CHECK_CALL(glEnableVertexAttribArray(bufferLoc));
	GLU_CHECK_CALL(glEnableVertexAttribArray(coordLoc));

	GLU_CHECK_CALL(glBindBuffer(GL_ARRAY_BUFFER, m_coordBuffer));
	GLU_CHECK_CALL(glVertexAttribPointer(coordLoc, 2, GL_FLOAT, GL_FALSE, 0, NULL));

	GLU_CHECK_CALL(glBindBuffer(GL_ARRAY_BUFFER, buffer));
	GLU_CHECK_CALL(glVertexAttribPointer(bufferLoc, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0));
	GLU_CHECK_CALL(glBindBuffer(GL_ARRAY_BUFFER, 0));

	GLU_CHECK_CALL(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_indexBuffer));
	GLU_CHECK_CALL(glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, NULL));

	GLU_CHECK_CALL(glDisableVertexAttribArray(bufferLoc));
	GLU_CHECK_CALL(glDisableVertexAttribArray(coordLoc));

	if (m_vao != 0)
		GLU_CHECK_CALL(glBindVertexArray(0));
}

class MemObjectAllocator
{
public:
	enum Result
	{
		RESULT_GOT_BAD_ALLOC = 0,
		RESULT_GEN_TEXTURES_FAILED,
		RESULT_GEN_BUFFERS_FAILED,
		RESULT_BUFFER_DATA_FAILED,
		RESULT_BUFFER_SUB_DATA_FAILED,
		RESULT_TEXTURE_IMAGE_FAILED,
		RESULT_TEXTURE_SUB_IMAGE_FAILED,
		RESULT_BIND_TEXTURE_FAILED,
		RESULT_BIND_BUFFER_FAILED,
		RESULT_DELETE_TEXTURES_FAILED,
		RESULT_DELETE_BUFFERS_FAILED,
		RESULT_RENDER_FAILED,

		RESULT_LAST
	};

						MemObjectAllocator	(tcu::TestLog& log, glu::RenderContext& renderContext, MemObjectType objectTypes, const MemObjectConfig& config, int seed);
						~MemObjectAllocator	(void);
	bool				allocUntilFailure	(void);
	void				clearObjects		(void);
	Result				getResult			(void) const { return m_result; }
	deUint32			getGLError			(void) const { return m_glError; }
	int					getObjectCount		(void) const { return m_objectCount; }
	deUint32			getBytes			(void) const { return m_bytesRequired; }

	static const char*	resultToString		(Result result);

private:

	void				allocateTexture		(de::Random& rnd);
	void				allocateBuffer		(de::Random& rnd);

	vector<deUint32>	m_buffers;
	vector<deUint32>	m_textures;
	int					m_seed;
	int					m_objectCount;
	deUint32			m_bytesRequired;
	MemObjectType		m_objectTypes;
	Result				m_result;
	MemObjectConfig		m_config;
	deUint32			m_glError;
	vector<deUint8>		m_unusedData;
	BufferRenderer		m_bufferRenderer;
	TextureRenderer		m_textureRenderer;
};

MemObjectAllocator::MemObjectAllocator (tcu::TestLog& log, glu::RenderContext& renderContext, MemObjectType objectTypes, const MemObjectConfig& config, int seed)
	: m_seed			(seed)
	, m_objectCount		(0)
	, m_bytesRequired	(0)
	, m_objectTypes		(objectTypes)
	, m_result			(RESULT_LAST)
	, m_config			(config)
	, m_glError			(0)
	, m_bufferRenderer	(log, renderContext)
	, m_textureRenderer	(log, renderContext)
{
	DE_UNREF(renderContext);

	if (m_config.useUnusedData)
	{
		int unusedSize = deMax32(m_config.maxBufferSize, m_config.maxTextureSize*m_config.maxTextureSize*4);
		m_unusedData = vector<deUint8>(unusedSize);
	}
	else if (m_config.write)
		m_unusedData = vector<deUint8>(128);
}

MemObjectAllocator::~MemObjectAllocator (void)
{
}

bool MemObjectAllocator::allocUntilFailure (void)
{
	de::Random rnd(m_seed);
	GLU_CHECK_MSG("Error in init");
	try
	{
		const deUint64	timeoutUs	= 10000000; // 10s
		deUint64		beginTimeUs	= deGetMicroseconds();
		deUint64		currentTimeUs;

		do
		{
			GLU_CHECK_MSG("Unkown Error");
			switch (m_objectTypes)
			{
				case MEMOBJECTTYPE_TEXTURE:
					allocateTexture(rnd);
					break;

				case MEMOBJECTTYPE_BUFFER:
					allocateBuffer(rnd);
					break;

				default:
				{
					if (rnd.getBool())
						allocateBuffer(rnd);
					else
						allocateTexture(rnd);
					break;
				}
			}

			if (m_result != RESULT_LAST)
			{
				glFinish();
				return true;
			}

			currentTimeUs = deGetMicroseconds();
		} while (currentTimeUs - beginTimeUs < timeoutUs);

		// Timeout
		if (currentTimeUs - beginTimeUs >= timeoutUs)
			return false;
		else
			return true;
	}
	catch (const std::bad_alloc&)
	{
		m_result = RESULT_GOT_BAD_ALLOC;
		return true;
	}
}

void MemObjectAllocator::clearObjects (void)
{
	deUint32 error = 0;

	if (!m_textures.empty())
	{
		glDeleteTextures((GLsizei)m_textures.size(), &(m_textures[0]));
		error = glGetError();
		if (error != 0)
		{
			m_result	= RESULT_DELETE_TEXTURES_FAILED;
			m_glError	= error;
		}

		m_textures.clear();
	}

	if (!m_buffers.empty())
	{
		glDeleteBuffers((GLsizei)m_buffers.size(), &(m_buffers[0]));
		error = glGetError();
		if (error != 0)
		{
			m_result	= RESULT_DELETE_BUFFERS_FAILED;
			m_glError	= error;
		}

		m_buffers.clear();
	}
}

void MemObjectAllocator::allocateTexture (de::Random& rnd)
{
	const int	vectorBlockSize = 128;
	deUint32	tex		= 0;
	deUint32	error	= 0;
	int			width	= rnd.getInt(m_config.minTextureSize, m_config.maxTextureSize);
	int			height	= rnd.getInt(m_config.minTextureSize, m_config.maxTextureSize);

	glGenTextures(1, &tex);
	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_GEN_TEXTURES_FAILED;
		m_glError	= error;
		return;
	}

	if (m_textures.size() % vectorBlockSize == 0)
		m_textures.reserve(m_textures.size() + vectorBlockSize);

	m_textures.push_back(tex);

	glBindTexture(GL_TEXTURE_2D, tex);
	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_BIND_TEXTURE_FAILED;
		m_glError	= error;
		return;
	}

	if (m_config.useUnusedData)
	{
		DE_ASSERT((int)m_unusedData.size() >= width*height*4);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, &(m_unusedData[0]));
	}
	else
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_TEXTURE_IMAGE_FAILED;
		m_glError	= error;
		return;
	}

	if (m_config.write)
		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &(m_unusedData[0]));

	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_TEXTURE_SUB_IMAGE_FAILED;
		m_glError	= error;
		return;
	}

	if (m_config.use)
	{
		try
		{
			m_textureRenderer.render(tex);
		}
		catch (const glu::Error& err)
		{
			m_result	= RESULT_RENDER_FAILED;
			m_glError	= err.getError();
			return;
		}
		catch (const glu::OutOfMemoryError&)
		{
			m_result	= RESULT_RENDER_FAILED;
			m_glError	= GL_OUT_OF_MEMORY;
			return;
		}
	}

	glBindTexture(GL_TEXTURE_2D, 0);
	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_BIND_TEXTURE_FAILED;
		m_glError	= error;
		return;
	}

	m_objectCount++;
	m_bytesRequired += width*height*4;
}

void MemObjectAllocator::allocateBuffer (de::Random& rnd)
{
	const int	vectorBlockSize = 128;
	deUint32	buffer			= 0;
	deUint32	error			= 0;
	int			size			= rnd.getInt(m_config.minBufferSize, m_config.maxBufferSize);

	glGenBuffers(1, &buffer);
	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_GEN_BUFFERS_FAILED;
		m_glError	= error;
		return;
	}

	glBindBuffer(GL_ARRAY_BUFFER, buffer);
	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_BIND_BUFFER_FAILED;
		m_glError	= error;
		return;
	}

	if (m_buffers.size() % vectorBlockSize == 0)
		m_buffers.reserve(m_buffers.size() + vectorBlockSize);

	m_buffers.push_back(buffer);

	if (m_config.useUnusedData)
	{
		DE_ASSERT((int)m_unusedData.size() >= size);
		glBufferData(GL_ARRAY_BUFFER, size, &(m_unusedData[0]), GL_DYNAMIC_DRAW);
	}
	else
		glBufferData(GL_ARRAY_BUFFER, size, NULL, GL_DYNAMIC_DRAW);

	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_BUFFER_DATA_FAILED;
		m_glError	= error;
		return;
	}

	if (m_config.write)
		glBufferSubData(GL_ARRAY_BUFFER, 0, 1, &(m_unusedData[0]));

	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_BUFFER_SUB_DATA_FAILED;
		m_glError	= error;
		return;
	}

	if (m_config.use)
	{
		try
		{
			m_bufferRenderer.render(buffer, size);
		}
		catch (const glu::Error& err)
		{
			m_result	= RESULT_RENDER_FAILED;
			m_glError	= err.getError();
			return;
		}
		catch (const glu::OutOfMemoryError&)
		{
			m_result	= RESULT_RENDER_FAILED;
			m_glError	= GL_OUT_OF_MEMORY;
			return;
		}
	}

	glBindBuffer(GL_ARRAY_BUFFER, 0);
	error = glGetError();
	if (error != 0)
	{
		m_result	= RESULT_BIND_BUFFER_FAILED;
		m_glError	= error;
		return;
	}

	m_objectCount++;
	m_bytesRequired += size;
}

const char* MemObjectAllocator::resultToString (Result result)
{
	switch (result)
	{
		case RESULT_GOT_BAD_ALLOC:
			return "Caught std::bad_alloc";
			break;

		case RESULT_GEN_TEXTURES_FAILED:
			return "glGenTextures failed";
			break;

		case RESULT_GEN_BUFFERS_FAILED:
			return "glGenBuffers failed";
			break;

		case RESULT_BUFFER_DATA_FAILED:
			return "glBufferData failed";
			break;

		case RESULT_BUFFER_SUB_DATA_FAILED:
			return "glBufferSubData failed";
			break;

		case RESULT_TEXTURE_IMAGE_FAILED:
			return "glTexImage2D failed";
			break;

		case RESULT_TEXTURE_SUB_IMAGE_FAILED:
			return "glTexSubImage2D failed";
			break;

		case RESULT_BIND_TEXTURE_FAILED:
			return "glBindTexture failed";
			break;

		case RESULT_BIND_BUFFER_FAILED:
			return "glBindBuffer failed";
			break;

		case RESULT_DELETE_TEXTURES_FAILED:
			return "glDeleteTextures failed";
			break;

		case RESULT_DELETE_BUFFERS_FAILED:
			return "glDeleteBuffers failed";
			break;

		case RESULT_RENDER_FAILED:
			return "Rendering result failed";
			break;

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

MemoryStressCase::MemoryStressCase (tcu::TestContext& ctx, glu::RenderContext& renderContext, deUint32 objectTypes, int minTextureSize, int maxTextureSize, int minBufferSize, int maxBufferSize, bool write, bool use, bool useUnusedData, bool clearAfterOOM, const char* name, const char* desc)
	: tcu::TestCase					(ctx, name, desc)
	, m_iteration					(0)
	, m_iterationCount				(5)
	, m_objectTypes					((MemObjectType)objectTypes)
	, m_zeroAlloc					(false)
	, m_clearAfterOOM				(clearAfterOOM)
	, m_renderCtx					(renderContext)
{
	m_allocated.reserve(m_iterationCount);
	m_config.maxTextureSize = maxTextureSize;
	m_config.minTextureSize = minTextureSize;
	m_config.maxBufferSize	= maxBufferSize;
	m_config.minBufferSize	= minBufferSize;
	m_config.useUnusedData	= useUnusedData;
	m_config.write			= write;
	m_config.use			= use;
}

MemoryStressCase::~MemoryStressCase (void)
{
}

void MemoryStressCase::init (void)
{
	if (!m_testCtx.getCommandLine().isOutOfMemoryTestEnabled())
	{
		m_testCtx.getLog() << TestLog::Message << "Tests that exhaust memory are disabled, use --deqp-test-oom=enable command line option to enable." << TestLog::EndMessage;
		throw tcu::NotSupportedError("OOM tests disabled");
	}
}

void MemoryStressCase::deinit (void)
{
	TCU_CHECK(!m_zeroAlloc);
}

tcu::TestCase::IterateResult MemoryStressCase::iterate (void)
{
	bool			end		= false;
	tcu::TestLog&	log		= m_testCtx.getLog();

	MemObjectAllocator allocator(log, m_renderCtx, m_objectTypes, m_config, deStringHash(getName()));

	if (!allocator.allocUntilFailure())
	{
		// Allocation timed out
		allocator.clearObjects();

		log << TestLog::Message << "Timeout. Couldn't exhaust memory in timelimit. Allocated " << allocator.getObjectCount() << " objects." << TestLog::EndMessage;

		m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		return STOP;
	}

	// Try to cancel rendering operations
	if (m_clearAfterOOM)
		GLU_CHECK_CALL(glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT));

	allocator.clearObjects();

	m_allocated.push_back(allocator.getObjectCount());

	if (m_iteration != 0  && allocator.getObjectCount() == 0)
		m_zeroAlloc = true;

	log << TestLog::Message << "Got error when allocation object count: " << allocator.getObjectCount() << " bytes: " << allocator.getBytes() << TestLog::EndMessage;

	if ((allocator.getGLError() == 0) && (allocator.getResult() == MemObjectAllocator::RESULT_GOT_BAD_ALLOC))
	{
		log << TestLog::Message << "std::bad_alloc" << TestLog::EndMessage;
		end = true;
		m_testCtx.setTestResult(QP_TEST_RESULT_RESOURCE_ERROR, "Memory allocation failed");
	}
	else if (allocator.getGLError() != GL_OUT_OF_MEMORY)
	{
		log << TestLog::Message << "Invalid Error " << MemObjectAllocator::resultToString(allocator.getResult())
			<< " GLError: " << glErrorToString(allocator.getGLError()) <<
		TestLog::EndMessage;

		end = true;
		m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Fail");
	}

	if ((m_iteration+1) == m_iterationCount)
	{
		int min = m_allocated[0];
		int max = m_allocated[0];

		float threshold = 50.0f;

		for (int allocNdx = 0; allocNdx < (int)m_allocated.size(); allocNdx++)
		{
			min = deMin32(m_allocated[allocNdx], min);
			max = deMax32(m_allocated[allocNdx], max);
		}

		if (min == 0 && max != 0)
		{
			log << TestLog::Message << "Allocation count zero" << TestLog::EndMessage;
			m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Fail");
		}
		else
		{
			const float change = (float)(min - max) / (float)(max);
			if (change > threshold)
			{
				log << TestLog::Message << "Allocated objects max: " << max << ", min: " << min << ", difference: " << change << "% threshold: " << threshold << "%" << TestLog::EndMessage;
				m_testCtx.setTestResult(QP_TEST_RESULT_QUALITY_WARNING, "Allocation count variation");
			}
			else
				m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		}
		end = true;
	}

	GLU_CHECK_CALL(glFinish());

	m_iteration++;
	if (end)
		return STOP;
	else
		return CONTINUE;
}

} // gls
} // deqp