Source/ThirdParty/ANGLE/src/tests/perf_tests/DrawCallPerf.cpp - WebKit - Git at Google

 //
 // Copyright 2014 The ANGLE Project Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // DrawCallPerf:
 //   Performance tests for ANGLE draw call overhead.
 //

 #include "ANGLEPerfTest.h"
 #include "DrawCallPerfParams.h"
 #include "common/PackedEnums.h"
 #include "test_utils/draw_call_perf_utils.h"
 #include "util/shader_utils.h"

 namespace
 {
 enum class StateChange
 {
     NoChange,
     VertexAttrib,
     VertexBuffer,
     ManyVertexBuffers,
     Texture,
     Program,
     InvalidEnum,
 };

 struct DrawArraysPerfParams : public DrawCallPerfParams
 {
     DrawArraysPerfParams() = default;
     DrawArraysPerfParams(const DrawCallPerfParams &base) : DrawCallPerfParams(base) {}

     std::string story() const override;

     StateChange stateChange = StateChange::NoChange;
 };

 std::string DrawArraysPerfParams::story() const
 {
     std::stringstream strstr;

     strstr << DrawCallPerfParams::story();

     switch (stateChange)
     {
         case StateChange::VertexAttrib:
             strstr << "_attrib_change";
             break;
         case StateChange::VertexBuffer:
             strstr << "_vbo_change";
             break;
         case StateChange::ManyVertexBuffers:
             strstr << "_manyvbos_change";
             break;
         case StateChange::Texture:
             strstr << "_tex_change";
             break;
         case StateChange::Program:
             strstr << "_prog_change";
             break;
         default:
             break;
     }

     return strstr.str();
 }

 std::ostream &operator<<(std::ostream &os, const DrawArraysPerfParams &params)
 {
     os << params.backendAndStory().substr(1);
     return os;
 }

 GLuint CreateSimpleTexture2D()
 {
     // Use tightly packed data
     glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

     // Generate a texture object
     GLuint texture;
     glGenTextures(1, &texture);

     // Bind the texture object
     glBindTexture(GL_TEXTURE_2D, texture);

     // Load the texture: 2x2 Image, 3 bytes per pixel (R, G, B)
     constexpr size_t width             = 2;
     constexpr size_t height            = 2;
     GLubyte pixels[width * height * 3] = {
         255, 0,   0,    // Red
         0,   255, 0,    // Green
         0,   0,   255,  // Blue
         255, 255, 0,    // Yellow
     };
     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);

     // Set the filtering mode
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

     return texture;
 }

 class DrawCallPerfBenchmark : public ANGLERenderTest,
                               public ::testing::WithParamInterface<DrawArraysPerfParams>
 {
   public:
     DrawCallPerfBenchmark();

     void initializeBenchmark() override;
     void destroyBenchmark() override;
     void drawBenchmark() override;

   private:
     GLuint mProgram1   = 0;
     GLuint mProgram2   = 0;
     GLuint mBuffer1    = 0;
     GLuint mBuffer2    = 0;
     GLuint mFBO        = 0;
     GLuint mFBOTexture = 0;
     GLuint mTexture1   = 0;
     GLuint mTexture2   = 0;
     int mNumTris       = GetParam().numTris;
 };

 DrawCallPerfBenchmark::DrawCallPerfBenchmark() : ANGLERenderTest("DrawCallPerf", GetParam()) {}

 void DrawCallPerfBenchmark::initializeBenchmark()
 {
     const auto &params = GetParam();

     if (params.stateChange == StateChange::Texture)
     {
         mProgram1 = SetupSimpleTextureProgram();
     }
     if (params.stateChange == StateChange::Program)
     {
         mProgram1 = SetupSimpleTextureProgram();
         mProgram2 = SetupDoubleTextureProgram();

         ASSERT_NE(0u, mProgram2);
     }
     else if (params.stateChange == StateChange::ManyVertexBuffers)
     {
         constexpr char kVS[] = R"(attribute vec2 vPosition;
 attribute vec2 v0;
 attribute vec2 v1;
 attribute vec2 v2;
 attribute vec2 v3;
 const float scale = 0.5;
 const float offset = -0.5;

 varying vec2 v;

 void main()
 {
     gl_Position = vec4(vPosition * vec2(scale) + vec2(offset), 0, 1);
     v = (v0 + v1 + v2 + v3) * 0.25;
 })";

         constexpr char kFS[] = R"(precision mediump float;
 varying vec2 v;
 void main()
 {
     gl_FragColor = vec4(v, 0, 1);
 })";

         mProgram1 = CompileProgram(kVS, kFS);
         glBindAttribLocation(mProgram1, 1, "v0");
         glBindAttribLocation(mProgram1, 2, "v1");
         glBindAttribLocation(mProgram1, 3, "v2");
         glBindAttribLocation(mProgram1, 4, "v3");
         glEnableVertexAttribArray(1);
         glEnableVertexAttribArray(2);
         glEnableVertexAttribArray(3);
         glEnableVertexAttribArray(4);
     }
     else
     {
         mProgram1 = SetupSimpleDrawProgram();
     }

     ASSERT_NE(0u, mProgram1);

     // Re-link program to ensure the attrib bindings are used.
     glBindAttribLocation(mProgram1, 0, "vPosition");
     glLinkProgram(mProgram1);
     glUseProgram(mProgram1);

     if (mProgram2)
     {
         glBindAttribLocation(mProgram2, 0, "vPosition");
         glLinkProgram(mProgram2);
     }

     glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

     mBuffer1 = Create2DTriangleBuffer(mNumTris, GL_STATIC_DRAW);
     mBuffer2 = Create2DTriangleBuffer(mNumTris, GL_STATIC_DRAW);

     glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
     glEnableVertexAttribArray(0);

     // Set the viewport
     glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());

     if (params.offscreen)
     {
         CreateColorFBO(getWindow()->getWidth(), getWindow()->getHeight(), &mFBOTexture, &mFBO);
     }

     mTexture1 = CreateSimpleTexture2D();
     mTexture2 = CreateSimpleTexture2D();

     if (params.stateChange == StateChange::Program)
     {
         // Bind the textures as appropriate, they are not modified during the test.
         GLint program1Tex1Loc = glGetUniformLocation(mProgram1, "tex");
         GLint program2Tex1Loc = glGetUniformLocation(mProgram2, "tex1");
         GLint program2Tex2Loc = glGetUniformLocation(mProgram2, "tex2");

         glUseProgram(mProgram1);
         glUniform1i(program1Tex1Loc, 0);

         glUseProgram(mProgram2);
         glUniform1i(program2Tex1Loc, 0);
         glUniform1i(program2Tex2Loc, 1);

         glActiveTexture(GL_TEXTURE0);
         glBindTexture(GL_TEXTURE_2D, mTexture1);

         glActiveTexture(GL_TEXTURE1);
         glBindTexture(GL_TEXTURE_2D, mTexture2);
     }

     ASSERT_GL_NO_ERROR();
 }

 void DrawCallPerfBenchmark::destroyBenchmark()
 {
     glDeleteProgram(mProgram1);
     glDeleteProgram(mProgram2);
     glDeleteBuffers(1, &mBuffer1);
     glDeleteBuffers(1, &mBuffer2);
     glDeleteTextures(1, &mFBOTexture);
     glDeleteTextures(1, &mTexture1);
     glDeleteTextures(1, &mTexture2);
     glDeleteFramebuffers(1, &mFBO);
 }

 void ClearThenDraw(unsigned int iterations, GLsizei numElements)
 {
     glClear(GL_COLOR_BUFFER_BIT);

     for (unsigned int it = 0; it < iterations; it++)
     {
         glDrawArrays(GL_TRIANGLES, 0, numElements);
     }
 }

 void JustDraw(unsigned int iterations, GLsizei numElements)
 {
     for (unsigned int it = 0; it < iterations; it++)
     {
         glDrawArrays(GL_TRIANGLES, 0, numElements);
     }
 }

 template <int kArrayBufferCount>
 void ChangeVertexAttribThenDraw(unsigned int iterations, GLsizei numElements, GLuint buffer)
 {
     glBindBuffer(GL_ARRAY_BUFFER, buffer);
     for (unsigned int it = 0; it < iterations; it++)
     {
         for (int arrayIndex = 0; arrayIndex < kArrayBufferCount; ++arrayIndex)
         {
             glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, 0);
         }
         glDrawArrays(GL_TRIANGLES, 0, numElements);

         for (int arrayIndex = 0; arrayIndex < kArrayBufferCount; ++arrayIndex)
         {
             glVertexAttribPointer(arrayIndex, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0);
         }
         glDrawArrays(GL_TRIANGLES, 0, numElements);
     }
 }
 template <int kArrayBufferCount>
 void ChangeArrayBuffersThenDraw(unsigned int iterations,
                                 GLsizei numElements,
                                 GLuint buffer1,
                                 GLuint buffer2)
 {
     for (unsigned int it = 0; it < iterations; it++)
     {
         glBindBuffer(GL_ARRAY_BUFFER, buffer1);
         for (int arrayIndex = 0; arrayIndex < kArrayBufferCount; ++arrayIndex)
         {
             glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, 0);
         }
         glDrawArrays(GL_TRIANGLES, 0, numElements);

         glBindBuffer(GL_ARRAY_BUFFER, buffer2);
         for (int arrayIndex = 0; arrayIndex < kArrayBufferCount; ++arrayIndex)
         {
             glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, 0);
         }
         glDrawArrays(GL_TRIANGLES, 0, numElements);
     }
 }

 void ChangeTextureThenDraw(unsigned int iterations,
                            GLsizei numElements,
                            GLuint texture1,
                            GLuint texture2)
 {
     for (unsigned int it = 0; it < iterations; it++)
     {
         glBindTexture(GL_TEXTURE_2D, texture1);
         glDrawArrays(GL_TRIANGLES, 0, numElements);

         glBindTexture(GL_TEXTURE_2D, texture2);
         glDrawArrays(GL_TRIANGLES, 0, numElements);
     }
 }

 void ChangeProgramThenDraw(unsigned int iterations,
                            GLsizei numElements,
                            GLuint program1,
                            GLuint program2)
 {
     for (unsigned int it = 0; it < iterations; it++)
     {
         glUseProgram(program1);
         glDrawArrays(GL_TRIANGLES, 0, numElements);

         glUseProgram(program2);
         glDrawArrays(GL_TRIANGLES, 0, numElements);
     }
 }

 void DrawCallPerfBenchmark::drawBenchmark()
 {
     // This workaround fixes a huge queue of graphics commands accumulating on the GL
     // back-end. The GL back-end doesn't have a proper NULL device at the moment.
     // TODO(jmadill): Remove this when/if we ever get a proper OpenGL NULL device.
     const auto &eglParams = GetParam().eglParameters;
     const auto &params    = GetParam();
     GLsizei numElements   = static_cast<GLsizei>(3 * mNumTris);

     switch (params.stateChange)
     {
         case StateChange::VertexAttrib:
             ChangeVertexAttribThenDraw<1>(params.iterationsPerStep, numElements, mBuffer1);
             break;
         case StateChange::VertexBuffer:
             ChangeArrayBuffersThenDraw<1>(params.iterationsPerStep, numElements, mBuffer1,
                                           mBuffer2);
             break;
         case StateChange::ManyVertexBuffers:
             ChangeArrayBuffersThenDraw<5>(params.iterationsPerStep, numElements, mBuffer1,
                                           mBuffer2);
             break;
         case StateChange::Texture:
             ChangeTextureThenDraw(params.iterationsPerStep, numElements, mTexture1, mTexture2);
             break;
         case StateChange::Program:
             ChangeProgramThenDraw(params.iterationsPerStep, numElements, mProgram1, mProgram2);
             break;
         case StateChange::NoChange:
             if (eglParams.deviceType != EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE ||
                 (eglParams.renderer != EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE &&
                  eglParams.renderer != EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE))
             {
                 ClearThenDraw(params.iterationsPerStep, numElements);
             }
             else
             {
                 JustDraw(params.iterationsPerStep, numElements);
             }
             break;
         case StateChange::InvalidEnum:
             FAIL() << "Invalid state change.";
             break;
     }

     ASSERT_GL_NO_ERROR();
 }

 TEST_P(DrawCallPerfBenchmark, Run)
 {
     run();
 }

 using namespace params;

 DrawArraysPerfParams CombineStateChange(const DrawArraysPerfParams &in, StateChange stateChange)
 {
     DrawArraysPerfParams out = in;
     out.stateChange          = stateChange;
     return out;
 }

 using P = DrawArraysPerfParams;

 std::vector<P> gTestsWithStateChange =
     CombineWithValues({P()}, angle::AllEnums<StateChange>(), CombineStateChange);
 std::vector<P> gTestsWithRenderer =
     CombineWithFuncs(gTestsWithStateChange, {D3D11<P>, GL<P>, Vulkan<P>, WGL<P>});
 std::vector<P> gTestsWithDevice =
     CombineWithFuncs(gTestsWithRenderer, {Passthrough<P>, Offscreen<P>, NullDevice<P>});

 ANGLE_INSTANTIATE_TEST_ARRAY(DrawCallPerfBenchmark, gTestsWithDevice);

 }  // anonymous namespace
	//
	// Copyright 2014 The ANGLE Project Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.
	//
	// DrawCallPerf:
	// Performance tests for ANGLE draw call overhead.
	//

	#include "ANGLEPerfTest.h"
	#include "DrawCallPerfParams.h"
	#include "common/PackedEnums.h"
	#include "test_utils/draw_call_perf_utils.h"
	#include "util/shader_utils.h"

	namespace
	{
	enum class StateChange
	{
	NoChange,
	VertexAttrib,
	VertexBuffer,
	ManyVertexBuffers,
	Texture,
	Program,
	InvalidEnum,
	};

	struct DrawArraysPerfParams : public DrawCallPerfParams
	{
	DrawArraysPerfParams() = default;
	DrawArraysPerfParams(const DrawCallPerfParams &base) : DrawCallPerfParams(base) {}

	std::string story() const override;

	StateChange stateChange = StateChange::NoChange;
	};

	std::string DrawArraysPerfParams::story() const
	{
	std::stringstream strstr;

	strstr << DrawCallPerfParams::story();

	switch (stateChange)
	{
	case StateChange::VertexAttrib:
	strstr << "_attrib_change";
	break;
	case StateChange::VertexBuffer:
	strstr << "_vbo_change";
	break;
	case StateChange::ManyVertexBuffers:
	strstr << "_manyvbos_change";
	break;
	case StateChange::Texture:
	strstr << "_tex_change";
	break;
	case StateChange::Program:
	strstr << "_prog_change";
	break;
	default:
	break;
	}

	return strstr.str();
	}

	std::ostream &operator<<(std::ostream &os, const DrawArraysPerfParams &params)
	{
	os << params.backendAndStory().substr(1);
	return os;
	}

	GLuint CreateSimpleTexture2D()
	{
	// Use tightly packed data
	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

	// Generate a texture object
	GLuint texture;
	glGenTextures(1, &texture);

	// Bind the texture object
	glBindTexture(GL_TEXTURE_2D, texture);

	// Load the texture: 2x2 Image, 3 bytes per pixel (R, G, B)
	constexpr size_t width = 2;
	constexpr size_t height = 2;
	GLubyte pixels[width * height * 3] = {
	255, 0, 0, // Red
	0, 255, 0, // Green
	0, 0, 255, // Blue
	255, 255, 0, // Yellow
	};
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);

	// Set the filtering mode
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

	return texture;
	}

	class DrawCallPerfBenchmark : public ANGLERenderTest,
	public ::testing::WithParamInterface<DrawArraysPerfParams>
	{
	public:
	DrawCallPerfBenchmark();

	void initializeBenchmark() override;
	void destroyBenchmark() override;
	void drawBenchmark() override;

	private:
	GLuint mProgram1 = 0;
	GLuint mProgram2 = 0;
	GLuint mBuffer1 = 0;
	GLuint mBuffer2 = 0;
	GLuint mFBO = 0;
	GLuint mFBOTexture = 0;
	GLuint mTexture1 = 0;
	GLuint mTexture2 = 0;
	int mNumTris = GetParam().numTris;
	};

	DrawCallPerfBenchmark::DrawCallPerfBenchmark() : ANGLERenderTest("DrawCallPerf", GetParam()) {}

	void DrawCallPerfBenchmark::initializeBenchmark()
	{
	const auto &params = GetParam();

	if (params.stateChange == StateChange::Texture)
	{
	mProgram1 = SetupSimpleTextureProgram();
	}
	if (params.stateChange == StateChange::Program)
	{
	mProgram1 = SetupSimpleTextureProgram();
	mProgram2 = SetupDoubleTextureProgram();

	ASSERT_NE(0u, mProgram2);
	}
	else if (params.stateChange == StateChange::ManyVertexBuffers)
	{
	constexpr char kVS[] = R"(attribute vec2 vPosition;
	attribute vec2 v0;
	attribute vec2 v1;
	attribute vec2 v2;
	attribute vec2 v3;
	const float scale = 0.5;
	const float offset = -0.5;

	varying vec2 v;

	void main()
	{
	gl_Position = vec4(vPosition * vec2(scale) + vec2(offset), 0, 1);
	v = (v0 + v1 + v2 + v3) * 0.25;
	})";

	constexpr char kFS[] = R"(precision mediump float;
	varying vec2 v;
	void main()
	{
	gl_FragColor = vec4(v, 0, 1);
	})";

	mProgram1 = CompileProgram(kVS, kFS);
	glBindAttribLocation(mProgram1, 1, "v0");
	glBindAttribLocation(mProgram1, 2, "v1");
	glBindAttribLocation(mProgram1, 3, "v2");
	glBindAttribLocation(mProgram1, 4, "v3");
	glEnableVertexAttribArray(1);
	glEnableVertexAttribArray(2);
	glEnableVertexAttribArray(3);
	glEnableVertexAttribArray(4);
	}
	else
	{
	mProgram1 = SetupSimpleDrawProgram();
	}

	ASSERT_NE(0u, mProgram1);

	// Re-link program to ensure the attrib bindings are used.
	glBindAttribLocation(mProgram1, 0, "vPosition");
	glLinkProgram(mProgram1);
	glUseProgram(mProgram1);

	if (mProgram2)
	{
	glBindAttribLocation(mProgram2, 0, "vPosition");
	glLinkProgram(mProgram2);
	}

	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

	mBuffer1 = Create2DTriangleBuffer(mNumTris, GL_STATIC_DRAW);
	mBuffer2 = Create2DTriangleBuffer(mNumTris, GL_STATIC_DRAW);

	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
	glEnableVertexAttribArray(0);

	// Set the viewport
	glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());

	if (params.offscreen)
	{
	CreateColorFBO(getWindow()->getWidth(), getWindow()->getHeight(), &mFBOTexture, &mFBO);
	}

	mTexture1 = CreateSimpleTexture2D();
	mTexture2 = CreateSimpleTexture2D();

	if (params.stateChange == StateChange::Program)
	{
	// Bind the textures as appropriate, they are not modified during the test.
	GLint program1Tex1Loc = glGetUniformLocation(mProgram1, "tex");
	GLint program2Tex1Loc = glGetUniformLocation(mProgram2, "tex1");
	GLint program2Tex2Loc = glGetUniformLocation(mProgram2, "tex2");

	glUseProgram(mProgram1);
	glUniform1i(program1Tex1Loc, 0);

	glUseProgram(mProgram2);
	glUniform1i(program2Tex1Loc, 0);
	glUniform1i(program2Tex2Loc, 1);

	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, mTexture1);

	glActiveTexture(GL_TEXTURE1);
	glBindTexture(GL_TEXTURE_2D, mTexture2);
	}

	ASSERT_GL_NO_ERROR();
	}

	void DrawCallPerfBenchmark::destroyBenchmark()
	{
	glDeleteProgram(mProgram1);
	glDeleteProgram(mProgram2);
	glDeleteBuffers(1, &mBuffer1);
	glDeleteBuffers(1, &mBuffer2);
	glDeleteTextures(1, &mFBOTexture);
	glDeleteTextures(1, &mTexture1);
	glDeleteTextures(1, &mTexture2);
	glDeleteFramebuffers(1, &mFBO);
	}

	void ClearThenDraw(unsigned int iterations, GLsizei numElements)
	{
	glClear(GL_COLOR_BUFFER_BIT);

	for (unsigned int it = 0; it < iterations; it++)
	{
	glDrawArrays(GL_TRIANGLES, 0, numElements);
	}
	}

	void JustDraw(unsigned int iterations, GLsizei numElements)
	{
	for (unsigned int it = 0; it < iterations; it++)
	{
	glDrawArrays(GL_TRIANGLES, 0, numElements);
	}
	}

	template <int kArrayBufferCount>
	void ChangeVertexAttribThenDraw(unsigned int iterations, GLsizei numElements, GLuint buffer)
	{
	glBindBuffer(GL_ARRAY_BUFFER, buffer);
	for (unsigned int it = 0; it < iterations; it++)
	{
	for (int arrayIndex = 0; arrayIndex < kArrayBufferCount; ++arrayIndex)
	{
	glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, 0);
	}
	glDrawArrays(GL_TRIANGLES, 0, numElements);

	for (int arrayIndex = 0; arrayIndex < kArrayBufferCount; ++arrayIndex)
	{
	glVertexAttribPointer(arrayIndex, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0);
	}
	glDrawArrays(GL_TRIANGLES, 0, numElements);
	}
	}
	template <int kArrayBufferCount>
	void ChangeArrayBuffersThenDraw(unsigned int iterations,
	GLsizei numElements,
	GLuint buffer1,
	GLuint buffer2)
	{
	for (unsigned int it = 0; it < iterations; it++)
	{
	glBindBuffer(GL_ARRAY_BUFFER, buffer1);
	for (int arrayIndex = 0; arrayIndex < kArrayBufferCount; ++arrayIndex)
	{
	glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, 0);
	}
	glDrawArrays(GL_TRIANGLES, 0, numElements);

	glBindBuffer(GL_ARRAY_BUFFER, buffer2);
	for (int arrayIndex = 0; arrayIndex < kArrayBufferCount; ++arrayIndex)
	{
	glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, 0);
	}
	glDrawArrays(GL_TRIANGLES, 0, numElements);
	}
	}

	void ChangeTextureThenDraw(unsigned int iterations,
	GLsizei numElements,
	GLuint texture1,
	GLuint texture2)
	{
	for (unsigned int it = 0; it < iterations; it++)
	{
	glBindTexture(GL_TEXTURE_2D, texture1);
	glDrawArrays(GL_TRIANGLES, 0, numElements);

	glBindTexture(GL_TEXTURE_2D, texture2);
	glDrawArrays(GL_TRIANGLES, 0, numElements);
	}
	}

	void ChangeProgramThenDraw(unsigned int iterations,
	GLsizei numElements,
	GLuint program1,
	GLuint program2)
	{
	for (unsigned int it = 0; it < iterations; it++)
	{
	glUseProgram(program1);
	glDrawArrays(GL_TRIANGLES, 0, numElements);

	glUseProgram(program2);
	glDrawArrays(GL_TRIANGLES, 0, numElements);
	}
	}

	void DrawCallPerfBenchmark::drawBenchmark()
	{
	// This workaround fixes a huge queue of graphics commands accumulating on the GL
	// back-end. The GL back-end doesn't have a proper NULL device at the moment.
	// TODO(jmadill): Remove this when/if we ever get a proper OpenGL NULL device.
	const auto &eglParams = GetParam().eglParameters;
	const auto &params = GetParam();
	GLsizei numElements = static_cast<GLsizei>(3 * mNumTris);

	switch (params.stateChange)
	{
	case StateChange::VertexAttrib:
	ChangeVertexAttribThenDraw<1>(params.iterationsPerStep, numElements, mBuffer1);
	break;
	case StateChange::VertexBuffer:
	ChangeArrayBuffersThenDraw<1>(params.iterationsPerStep, numElements, mBuffer1,
	mBuffer2);
	break;
	case StateChange::ManyVertexBuffers:
	ChangeArrayBuffersThenDraw<5>(params.iterationsPerStep, numElements, mBuffer1,
	mBuffer2);
	break;
	case StateChange::Texture:
	ChangeTextureThenDraw(params.iterationsPerStep, numElements, mTexture1, mTexture2);
	break;
	case StateChange::Program:
	ChangeProgramThenDraw(params.iterationsPerStep, numElements, mProgram1, mProgram2);
	break;
	case StateChange::NoChange:
	if (eglParams.deviceType != EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE \|\|
	(eglParams.renderer != EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE &&
	eglParams.renderer != EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE))
	{
	ClearThenDraw(params.iterationsPerStep, numElements);
	}
	else
	{
	JustDraw(params.iterationsPerStep, numElements);
	}
	break;
	case StateChange::InvalidEnum:
	FAIL() << "Invalid state change.";
	break;
	}

	ASSERT_GL_NO_ERROR();
	}

	TEST_P(DrawCallPerfBenchmark, Run)
	{
	run();
	}

	using namespace params;

	DrawArraysPerfParams CombineStateChange(const DrawArraysPerfParams &in, StateChange stateChange)
	{
	DrawArraysPerfParams out = in;
	out.stateChange = stateChange;
	return out;
	}

	using P = DrawArraysPerfParams;

	std::vector<P> gTestsWithStateChange =
	CombineWithValues({P()}, angle::AllEnums<StateChange>(), CombineStateChange);
	std::vector<P> gTestsWithRenderer =
	CombineWithFuncs(gTestsWithStateChange, {D3D11<P>, GL<P>, Vulkan<P>, WGL<P>});
	std::vector<P> gTestsWithDevice =
	CombineWithFuncs(gTestsWithRenderer, {Passthrough<P>, Offscreen<P>, NullDevice<P>});

	ANGLE_INSTANTIATE_TEST_ARRAY(DrawCallPerfBenchmark, gTestsWithDevice);

	} // anonymous namespace