gpu/command_buffer/tests/gl_virtual_contexts_unittest.cc - chromium/src.git - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stdint.h>

 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"

 #define SHADER(Src) #Src

 namespace gpu {

 class GLVirtualContextsTest : public testing::Test {
  protected:
   static const int kSize0 = 4;
   static const int kSize1 = 8;
   static const int kSize2 = 16;

   static const GLfloat kFloatRed[4];
   static const GLfloat kFloatGreen[4];
   static const uint8_t kExpectedRed[4];
   static const uint8_t kExpectedGreen[4];

   void SetUp() override {
     GLManager::Options options;
     options.size = gfx::Size(kSize0, kSize0);
     gl_real_.Initialize(options);
     gl_real_shared_.Initialize(options);
     options.virtual_manager = &gl_real_shared_;
     options.size = gfx::Size(kSize1, kSize1);
     gl1_.Initialize(options);
     options.size = gfx::Size(kSize2, kSize2);
     gl2_.Initialize(options);
   }

   void TearDown() override {
     gl1_.Destroy();
     gl2_.Destroy();
     gl_real_shared_.Destroy();
     gl_real_.Destroy();
   }

   GLuint SetupColoredVertexProgram() {
     static const char* v_shader_str = SHADER(
         attribute vec4 a_position;
         attribute vec4 a_color;
         varying vec4 v_color;
         void main()
         {
            gl_Position = a_position;
            v_color = a_color;
         }
      );

     static const char* f_shader_str = SHADER(
         precision mediump float;
         varying vec4 v_color;
         void main()
         {
           gl_FragColor = v_color;
         }
     );

     GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
     glUseProgram(program);
     return program;
   }

   void SetUpColoredUnitQuad(const GLfloat* color) {
     GLuint program1 = SetupColoredVertexProgram();
     GLuint position_loc1 = glGetAttribLocation(program1, "a_position");
     GLuint color_loc1 = glGetAttribLocation(program1, "a_color");
     GLTestHelper::SetupUnitQuad(position_loc1);
     GLTestHelper::SetupColorsForUnitQuad(color_loc1, color, GL_STATIC_DRAW);
   }

   GLManager gl_real_;
   GLManager gl_real_shared_;
   GLManager gl1_;
   GLManager gl2_;
 };

 const GLfloat GLVirtualContextsTest::kFloatRed[4] = {
     1.0f, 0.0f, 0.0f, 1.0f,
 };
 const GLfloat GLVirtualContextsTest::kFloatGreen[4] = {
     0.0f, 1.0f, 0.0f, 1.0f,
 };
 const uint8_t GLVirtualContextsTest::kExpectedRed[4] = {
     255, 0, 0, 255,
 };
 const uint8_t GLVirtualContextsTest::kExpectedGreen[4] = {
     0, 255, 0, 255,
 };

 namespace {

 void SetupSimpleShader(const uint8_t* color) {
   static const char* v_shader_str = SHADER(
       attribute vec4 a_Position;
       void main()
       {
          gl_Position = a_Position;
       }
    );

   static const char* f_shader_str = SHADER(
       precision mediump float;
       uniform vec4 u_color;
       void main()
       {
         gl_FragColor = u_color;
       }
   );

   GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
   glUseProgram(program);

   GLuint position_loc = glGetAttribLocation(program, "a_Position");

   GLTestHelper::SetupUnitQuad(position_loc);

   GLuint color_loc = glGetUniformLocation(program, "u_color");
   glUniform4f(
       color_loc,
       color[0] / 255.0f,
       color[1] / 255.0f,
       color[2] / 255.0f,
       color[3] / 255.0f);
 }

 void TestDraw(int size) {
   uint8_t expected_clear[] = {
       127, 0, 255, 0,
   };
   glClearColor(0.5f, 0.0f, 1.0f, 0.0f);
   glClear(GL_COLOR_BUFFER_BIT);
   EXPECT_TRUE(
       GLTestHelper::CheckPixels(0, 0, size, size, 1, expected_clear, nullptr));
   glDrawArrays(GL_TRIANGLES, 0, 6);
 }

 }  // anonymous namespace

 // http://crbug.com/281565
 TEST_F(GLVirtualContextsTest, Basic) {
   struct TestInfo {
     int size;
     uint8_t color[4];
     GLManager* manager;
   };
   const int kNumTests = 3;
   TestInfo tests[] = {
     { kSize0, { 255, 0, 0, 0, }, &gl_real_, },
     { kSize1, { 0, 255, 0, 0, }, &gl1_, },
     { kSize2, { 0, 0, 255, 0, }, &gl2_, },
   };

   for (int ii = 0; ii < kNumTests; ++ii) {
     const TestInfo& test = tests[ii];
     GLManager* gl_manager = test.manager;
     gl_manager->MakeCurrent();
     SetupSimpleShader(test.color);
   }

   for (int ii = 0; ii < kNumTests; ++ii) {
     const TestInfo& test = tests[ii];
     GLManager* gl_manager = test.manager;
     gl_manager->MakeCurrent();
     TestDraw(test.size);
   }

   for (int ii = 0; ii < kNumTests; ++ii) {
     const TestInfo& test = tests[ii];
     GLManager* gl_manager = test.manager;
     gl_manager->MakeCurrent();
     EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, test.size, test.size, 0,
                                           test.color, nullptr));
   }

   for (int ii = 0; ii < kNumTests; ++ii) {
     const TestInfo& test = tests[ii];
     GLManager* gl_manager = test.manager;
     gl_manager->MakeCurrent();
     GLTestHelper::CheckGLError("no errors", __LINE__);
   }
 }

 // http://crbug.com/363407
 TEST_F(GLVirtualContextsTest, VertexArrayObjectRestore) {
   GLuint vao1 = 0, vao2 = 0;

   gl1_.MakeCurrent();
   // Set up red quad in vao1.
   glGenVertexArraysOES(1, &vao1);
   glBindVertexArrayOES(vao1);
   SetUpColoredUnitQuad(kFloatRed);
   glFinish();

   gl2_.MakeCurrent();
   // Set up green quad in vao2.
   glGenVertexArraysOES(1, &vao2);
   glBindVertexArrayOES(vao2);
   SetUpColoredUnitQuad(kFloatGreen);
   glFinish();

   gl1_.MakeCurrent();
   // Test to ensure that vao1 is still the active VAO for this context.
   glDrawArrays(GL_TRIANGLES, 0, 6);
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize1, kSize1, 0, kExpectedRed,
                                         nullptr));
   glFinish();
   GLTestHelper::CheckGLError("no errors", __LINE__);

   gl2_.MakeCurrent();
   // Test to ensure that vao2 is still the active VAO for this context.
   glDrawArrays(GL_TRIANGLES, 0, 6);
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize2, kSize2, 0, kExpectedGreen,
                                         nullptr));
   glFinish();
   GLTestHelper::CheckGLError("no errors", __LINE__);
 }

 // http://crbug.com/363407
 TEST_F(GLVirtualContextsTest, VertexArrayObjectRestoreRebind) {
   GLuint vao1 = 0, vao2 = 0;

   gl1_.MakeCurrent();
   // Set up red quad in vao1.
   glGenVertexArraysOES(1, &vao1);
   glBindVertexArrayOES(vao1);
   SetUpColoredUnitQuad(kFloatRed);
   glFinish();

   gl2_.MakeCurrent();
   // Set up green quad in new vao2.
   glGenVertexArraysOES(1, &vao2);
   glBindVertexArrayOES(vao2);
   SetUpColoredUnitQuad(kFloatGreen);
   glFinish();

   gl1_.MakeCurrent();
   // Test to ensure that vao1 hasn't been corrupted after rebinding.
   // Bind 0 is required so that bind vao1 is not optimized away in the service.
   glBindVertexArrayOES(0);
   glBindVertexArrayOES(vao1);
   glDrawArrays(GL_TRIANGLES, 0, 6);
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize1, kSize1, 0, kExpectedRed,
                                         nullptr));
   glFinish();
   GLTestHelper::CheckGLError("no errors", __LINE__);

   gl2_.MakeCurrent();
   // Test to ensure that vao1 hasn't been corrupted after rebinding.
   // Bind 0 is required so that bind vao2 is not optimized away in the service.
   glBindVertexArrayOES(0);
   glBindVertexArrayOES(vao2);
   glDrawArrays(GL_TRIANGLES, 0, 6);
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize2, kSize2, 0, kExpectedGreen,
                                         nullptr));
   glFinish();

   GLTestHelper::CheckGLError("no errors", __LINE__);
 }

 // http://crbug.com/363407
 TEST_F(GLVirtualContextsTest, VertexArrayObjectRestoreDefault) {
   gl1_.MakeCurrent();
   // Set up red quad in default VAO.
   SetUpColoredUnitQuad(kFloatRed);
   glFinish();

   gl2_.MakeCurrent();
   // Set up green quad in default VAO.
   SetUpColoredUnitQuad(kFloatGreen);
   glFinish();

   // Gen & bind a non-default VAO.
   GLuint vao;
   glGenVertexArraysOES(1, &vao);
   glBindVertexArrayOES(vao);
   glFinish();

   gl1_.MakeCurrent();
   // Test to ensure that default VAO on gl1_ is still valid.
   glDrawArrays(GL_TRIANGLES, 0, 6);
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize1, kSize1, 0, kExpectedRed,
                                         nullptr));
   glFinish();

   gl2_.MakeCurrent();
   // Test to ensure that default VAO on gl2_ is still valid.
   // This tests that a default VAO is restored even when it's not currently
   // bound during the context switch.
   glBindVertexArrayOES(0);
   glDrawArrays(GL_TRIANGLES, 0, 6);
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize2, kSize2, 0, kExpectedGreen,
                                         nullptr));
   glFinish();

   GLTestHelper::CheckGLError("no errors", __LINE__);
 }

 TEST_F(GLVirtualContextsTest, VirtualQueries) {
   const GLenum query_targets[] = {
     GL_ANY_SAMPLES_PASSED_EXT,
     GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT,
     GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM,
     GL_COMMANDS_COMPLETED_CHROMIUM,
     GL_COMMANDS_ISSUED_CHROMIUM,
     GL_GET_ERROR_QUERY_CHROMIUM,
     GL_LATENCY_QUERY_CHROMIUM,
     GL_TIME_ELAPSED_EXT,
   };

   for (GLenum query_target : query_targets) {
     GLuint query1 = 0;
     gl1_.MakeCurrent();
     glGenQueriesEXT(1, &query1);
     glBeginQueryEXT(query_target, query1);
     const GLenum begin_error = glGetError();
     if (GL_INVALID_OPERATION == begin_error) {
       // Not supported, simply skip.
       glDeleteQueriesEXT(1, &query1);
       continue;
     }
     ASSERT_TRUE(GL_NO_ERROR == begin_error);

     GLuint query2 = 0;
     gl2_.MakeCurrent();
     glGenQueriesEXT(1, &query2);
     glBeginQueryEXT(query_target, query2);
     EXPECT_TRUE(GL_NO_ERROR == glGetError())
         << "Virtualized Query " << query_target << " failed.";

     gl1_.MakeCurrent();
     glEndQueryEXT(query_target);
     glFinish();

     GLuint query1_available = 0;
     glGetQueryObjectuivEXT(query1, GL_QUERY_RESULT_AVAILABLE_EXT,
                            &query1_available);
     EXPECT_TRUE(query1_available);

     glDeleteQueriesEXT(1, &query1);
     GLTestHelper::CheckGLError("no errors", __LINE__);

     gl2_.MakeCurrent();
     glEndQueryEXT(query_target);
     glFinish();

     GLuint query2_available = 0;
     glGetQueryObjectuivEXT(query2, GL_QUERY_RESULT_AVAILABLE_EXT,
                            &query2_available);
     EXPECT_TRUE(query2_available);

     glDeleteQueriesEXT(1, &query2);
     GLTestHelper::CheckGLError("no errors", __LINE__);
   }
 }

 }  // namespace gpu
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include <GLES2/gl2.h>
	#include <GLES2/gl2ext.h>
	#include <GLES2/gl2extchromium.h>
	#include <stdint.h>

	#include "gpu/command_buffer/tests/gl_manager.h"
	#include "gpu/command_buffer/tests/gl_test_utils.h"
	#include "testing/gmock/include/gmock/gmock.h"
	#include "testing/gtest/include/gtest/gtest.h"

	#define SHADER(Src) #Src

	namespace gpu {

	class GLVirtualContextsTest : public testing::Test {
	protected:
	static const int kSize0 = 4;
	static const int kSize1 = 8;
	static const int kSize2 = 16;

	static const GLfloat kFloatRed[4];
	static const GLfloat kFloatGreen[4];
	static const uint8_t kExpectedRed[4];
	static const uint8_t kExpectedGreen[4];

	void SetUp() override {
	GLManager::Options options;
	options.size = gfx::Size(kSize0, kSize0);
	gl_real_.Initialize(options);
	gl_real_shared_.Initialize(options);
	options.virtual_manager = &gl_real_shared_;
	options.size = gfx::Size(kSize1, kSize1);
	gl1_.Initialize(options);
	options.size = gfx::Size(kSize2, kSize2);
	gl2_.Initialize(options);
	}

	void TearDown() override {
	gl1_.Destroy();
	gl2_.Destroy();
	gl_real_shared_.Destroy();
	gl_real_.Destroy();
	}

	GLuint SetupColoredVertexProgram() {
	static const char* v_shader_str = SHADER(
	attribute vec4 a_position;
	attribute vec4 a_color;
	varying vec4 v_color;
	void main()
	{
	gl_Position = a_position;
	v_color = a_color;
	}
	);

	static const char* f_shader_str = SHADER(
	precision mediump float;
	varying vec4 v_color;
	void main()
	{
	gl_FragColor = v_color;
	}
	);

	GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
	glUseProgram(program);
	return program;
	}

	void SetUpColoredUnitQuad(const GLfloat* color) {
	GLuint program1 = SetupColoredVertexProgram();
	GLuint position_loc1 = glGetAttribLocation(program1, "a_position");
	GLuint color_loc1 = glGetAttribLocation(program1, "a_color");
	GLTestHelper::SetupUnitQuad(position_loc1);
	GLTestHelper::SetupColorsForUnitQuad(color_loc1, color, GL_STATIC_DRAW);
	}

	GLManager gl_real_;
	GLManager gl_real_shared_;
	GLManager gl1_;
	GLManager gl2_;
	};

	const GLfloat GLVirtualContextsTest::kFloatRed[4] = {
	1.0f, 0.0f, 0.0f, 1.0f,
	};
	const GLfloat GLVirtualContextsTest::kFloatGreen[4] = {
	0.0f, 1.0f, 0.0f, 1.0f,
	};
	const uint8_t GLVirtualContextsTest::kExpectedRed[4] = {
	255, 0, 0, 255,
	};
	const uint8_t GLVirtualContextsTest::kExpectedGreen[4] = {
	0, 255, 0, 255,
	};

	namespace {

	void SetupSimpleShader(const uint8_t* color) {
	static const char* v_shader_str = SHADER(
	attribute vec4 a_Position;
	void main()
	{
	gl_Position = a_Position;
	}
	);

	static const char* f_shader_str = SHADER(
	precision mediump float;
	uniform vec4 u_color;
	void main()
	{
	gl_FragColor = u_color;
	}
	);

	GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
	glUseProgram(program);

	GLuint position_loc = glGetAttribLocation(program, "a_Position");

	GLTestHelper::SetupUnitQuad(position_loc);

	GLuint color_loc = glGetUniformLocation(program, "u_color");
	glUniform4f(
	color_loc,
	color[0] / 255.0f,
	color[1] / 255.0f,
	color[2] / 255.0f,
	color[3] / 255.0f);
	}

	void TestDraw(int size) {
	uint8_t expected_clear[] = {
	127, 0, 255, 0,
	};
	glClearColor(0.5f, 0.0f, 1.0f, 0.0f);
	glClear(GL_COLOR_BUFFER_BIT);
	EXPECT_TRUE(
	GLTestHelper::CheckPixels(0, 0, size, size, 1, expected_clear, nullptr));
	glDrawArrays(GL_TRIANGLES, 0, 6);
	}

	} // anonymous namespace

	// http://crbug.com/281565
	TEST_F(GLVirtualContextsTest, Basic) {
	struct TestInfo {
	int size;
	uint8_t color[4];
	GLManager* manager;
	};
	const int kNumTests = 3;
	TestInfo tests[] = {
	{ kSize0, { 255, 0, 0, 0, }, &gl_real_, },
	{ kSize1, { 0, 255, 0, 0, }, &gl1_, },
	{ kSize2, { 0, 0, 255, 0, }, &gl2_, },
	};

	for (int ii = 0; ii < kNumTests; ++ii) {
	const TestInfo& test = tests[ii];
	GLManager* gl_manager = test.manager;
	gl_manager->MakeCurrent();
	SetupSimpleShader(test.color);
	}

	for (int ii = 0; ii < kNumTests; ++ii) {
	const TestInfo& test = tests[ii];
	GLManager* gl_manager = test.manager;
	gl_manager->MakeCurrent();
	TestDraw(test.size);
	}

	for (int ii = 0; ii < kNumTests; ++ii) {
	const TestInfo& test = tests[ii];
	GLManager* gl_manager = test.manager;
	gl_manager->MakeCurrent();
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, test.size, test.size, 0,
	test.color, nullptr));
	}

	for (int ii = 0; ii < kNumTests; ++ii) {
	const TestInfo& test = tests[ii];
	GLManager* gl_manager = test.manager;
	gl_manager->MakeCurrent();
	GLTestHelper::CheckGLError("no errors", __LINE__);
	}
	}

	// http://crbug.com/363407
	TEST_F(GLVirtualContextsTest, VertexArrayObjectRestore) {
	GLuint vao1 = 0, vao2 = 0;

	gl1_.MakeCurrent();
	// Set up red quad in vao1.
	glGenVertexArraysOES(1, &vao1);
	glBindVertexArrayOES(vao1);
	SetUpColoredUnitQuad(kFloatRed);
	glFinish();

	gl2_.MakeCurrent();
	// Set up green quad in vao2.
	glGenVertexArraysOES(1, &vao2);
	glBindVertexArrayOES(vao2);
	SetUpColoredUnitQuad(kFloatGreen);
	glFinish();

	gl1_.MakeCurrent();
	// Test to ensure that vao1 is still the active VAO for this context.
	glDrawArrays(GL_TRIANGLES, 0, 6);
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize1, kSize1, 0, kExpectedRed,
	nullptr));
	glFinish();
	GLTestHelper::CheckGLError("no errors", __LINE__);

	gl2_.MakeCurrent();
	// Test to ensure that vao2 is still the active VAO for this context.
	glDrawArrays(GL_TRIANGLES, 0, 6);
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize2, kSize2, 0, kExpectedGreen,
	nullptr));
	glFinish();
	GLTestHelper::CheckGLError("no errors", __LINE__);
	}

	// http://crbug.com/363407
	TEST_F(GLVirtualContextsTest, VertexArrayObjectRestoreRebind) {
	GLuint vao1 = 0, vao2 = 0;

	gl1_.MakeCurrent();
	// Set up red quad in vao1.
	glGenVertexArraysOES(1, &vao1);
	glBindVertexArrayOES(vao1);
	SetUpColoredUnitQuad(kFloatRed);
	glFinish();

	gl2_.MakeCurrent();
	// Set up green quad in new vao2.
	glGenVertexArraysOES(1, &vao2);
	glBindVertexArrayOES(vao2);
	SetUpColoredUnitQuad(kFloatGreen);
	glFinish();

	gl1_.MakeCurrent();
	// Test to ensure that vao1 hasn't been corrupted after rebinding.
	// Bind 0 is required so that bind vao1 is not optimized away in the service.
	glBindVertexArrayOES(0);
	glBindVertexArrayOES(vao1);
	glDrawArrays(GL_TRIANGLES, 0, 6);
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize1, kSize1, 0, kExpectedRed,
	nullptr));
	glFinish();
	GLTestHelper::CheckGLError("no errors", __LINE__);

	gl2_.MakeCurrent();
	// Test to ensure that vao1 hasn't been corrupted after rebinding.
	// Bind 0 is required so that bind vao2 is not optimized away in the service.
	glBindVertexArrayOES(0);
	glBindVertexArrayOES(vao2);
	glDrawArrays(GL_TRIANGLES, 0, 6);
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize2, kSize2, 0, kExpectedGreen,
	nullptr));
	glFinish();

	GLTestHelper::CheckGLError("no errors", __LINE__);
	}

	// http://crbug.com/363407
	TEST_F(GLVirtualContextsTest, VertexArrayObjectRestoreDefault) {
	gl1_.MakeCurrent();
	// Set up red quad in default VAO.
	SetUpColoredUnitQuad(kFloatRed);
	glFinish();

	gl2_.MakeCurrent();
	// Set up green quad in default VAO.
	SetUpColoredUnitQuad(kFloatGreen);
	glFinish();

	// Gen & bind a non-default VAO.
	GLuint vao;
	glGenVertexArraysOES(1, &vao);
	glBindVertexArrayOES(vao);
	glFinish();

	gl1_.MakeCurrent();
	// Test to ensure that default VAO on gl1_ is still valid.
	glDrawArrays(GL_TRIANGLES, 0, 6);
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize1, kSize1, 0, kExpectedRed,
	nullptr));
	glFinish();

	gl2_.MakeCurrent();
	// Test to ensure that default VAO on gl2_ is still valid.
	// This tests that a default VAO is restored even when it's not currently
	// bound during the context switch.
	glBindVertexArrayOES(0);
	glDrawArrays(GL_TRIANGLES, 0, 6);
	EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, kSize2, kSize2, 0, kExpectedGreen,
	nullptr));
	glFinish();

	GLTestHelper::CheckGLError("no errors", __LINE__);
	}

	TEST_F(GLVirtualContextsTest, VirtualQueries) {
	const GLenum query_targets[] = {
	GL_ANY_SAMPLES_PASSED_EXT,
	GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT,
	GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM,
	GL_COMMANDS_COMPLETED_CHROMIUM,
	GL_COMMANDS_ISSUED_CHROMIUM,
	GL_GET_ERROR_QUERY_CHROMIUM,
	GL_LATENCY_QUERY_CHROMIUM,
	GL_TIME_ELAPSED_EXT,
	};

	for (GLenum query_target : query_targets) {
	GLuint query1 = 0;
	gl1_.MakeCurrent();
	glGenQueriesEXT(1, &query1);
	glBeginQueryEXT(query_target, query1);
	const GLenum begin_error = glGetError();
	if (GL_INVALID_OPERATION == begin_error) {
	// Not supported, simply skip.
	glDeleteQueriesEXT(1, &query1);
	continue;
	}
	ASSERT_TRUE(GL_NO_ERROR == begin_error);

	GLuint query2 = 0;
	gl2_.MakeCurrent();
	glGenQueriesEXT(1, &query2);
	glBeginQueryEXT(query_target, query2);
	EXPECT_TRUE(GL_NO_ERROR == glGetError())
	<< "Virtualized Query " << query_target << " failed.";

	gl1_.MakeCurrent();
	glEndQueryEXT(query_target);
	glFinish();

	GLuint query1_available = 0;
	glGetQueryObjectuivEXT(query1, GL_QUERY_RESULT_AVAILABLE_EXT,
	&query1_available);
	EXPECT_TRUE(query1_available);

	glDeleteQueriesEXT(1, &query1);
	GLTestHelper::CheckGLError("no errors", __LINE__);

	gl2_.MakeCurrent();
	glEndQueryEXT(query_target);
	glFinish();

	GLuint query2_available = 0;
	glGetQueryObjectuivEXT(query2, GL_QUERY_RESULT_AVAILABLE_EXT,
	&query2_available);
	EXPECT_TRUE(query2_available);

	glDeleteQueriesEXT(1, &query2);
	GLTestHelper::CheckGLError("no errors", __LINE__);
	}
	}

	} // namespace gpu