kc3-lang/angle/tests/angle_tests/BlitFramebufferANGLETest.cpp

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  Commit

• Author : Jamie Madill
  Date : 2014-07-17 10:40:49
  Hash : b759a748
  Message : Fix test class names to reflect their class-ness. Style guide dictates a camel case scheme for classes. Since the tests are actually classes, update their names to reflect that. Change-Id: Ib7422b6d8c5de8414765439704fc103eae8b2d63 Reviewed-on: https://chromium-review.googlesource.com/208680 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Zhenyao Mo <zmo@chromium.org>

• tests/angle_tests/BlitFramebufferANGLETest.cpp

• #include "ANGLETest.h"
  
  class BlitFramebufferANGLETest : public ANGLETest
  {
  protected:
      BlitFramebufferANGLETest()
      {
          setWindowWidth(256);
          setWindowHeight(256);
          setConfigRedBits(8);
          setConfigGreenBits(8);
          setConfigBlueBits(8);
          setConfigAlphaBits(8);
          setConfigDepthBits(24);
  
          mCheckerProgram = 0;
          mBlueProgram = 0;
  
          mOriginalFBO = 0;
  
          mUserFBO = 0;
          mUserColorBuffer = 0;
          mUserDepthStencilBuffer = 0;
  
          mSmallFBO = 0;
          mSmallColorBuffer = 0;
          mSmallDepthStencilBuffer = 0;
  
          mColorOnlyFBO = 0;
          mColorOnlyColorBuffer = 0;
  
          mDiffFormatFBO = 0;
          mDiffFormatColorBuffer = 0;
  
          mDiffSizeFBO = 0;
          mDiffSizeColorBuffer = 0;
  
          mMRTFBO = 0;
          mMRTColorBuffer0 = 0;
          mMRTColorBuffer1 = 0;
  
          mRGBAColorbuffer = 0;
          mRGBAFBO = 0;
  
          mBGRAMultisampledRenderbuffer = 0;
          mBGRAMultisampledFBO = 0;
      }
  
      virtual void SetUp()
      {
          ANGLETest::SetUp();
  
          const std::string passthroughVS = SHADER_SOURCE
          (
              precision highp float;
              attribute vec4 position;
              varying vec4 pos;
  
              void main()
              {
                  gl_Position = position;
                  pos = position;
              }
          );
  
          const std::string checkeredFS = SHADER_SOURCE
          (
              precision highp float;
              varying vec4 pos;
  
              void main()
              {
                  if (pos.x * pos.y > 0.0)
                  {
                      gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
                  }
                  else
                  {
                      gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
                  }
              }
          );
  
          const std::string blueFS = SHADER_SOURCE
          (
              precision highp float;
              varying vec4 pos;
  
              void main()
              {
                  gl_FragColor = vec4(0.0, 0.0, 1.0, 1.0);
              }
          );
  
          mCheckerProgram = compileProgram(passthroughVS, checkeredFS);
          mBlueProgram = compileProgram(passthroughVS, blueFS);
          if (mCheckerProgram == 0 || mBlueProgram == 0)
          {
              FAIL() << "shader compilation failed.";
          }
  
          EXPECT_GL_NO_ERROR();
  
          GLint originalFBO;
          glGetIntegerv(GL_FRAMEBUFFER_BINDING, &originalFBO);
          if (originalFBO >= 0)
          {
              mOriginalFBO = (GLuint)originalFBO;
          }
  
          GLenum format = GL_BGRA8_EXT;
          
          glGenFramebuffers(1, &mUserFBO);
          glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
          glGenTextures(1, &mUserColorBuffer);
          glGenRenderbuffers(1, &mUserDepthStencilBuffer);
          glBindTexture(GL_TEXTURE_2D, mUserColorBuffer);
          glTexStorage2DEXT(GL_TEXTURE_2D, 1, format, getWindowWidth(), getWindowHeight());
          glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mUserColorBuffer, 0);
          glBindRenderbuffer(GL_RENDERBUFFER, mUserDepthStencilBuffer);
          glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8_OES, getWindowWidth(), getWindowHeight());
          glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, mUserDepthStencilBuffer);
          glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, mUserDepthStencilBuffer);
  
          ASSERT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
          ASSERT_GL_NO_ERROR();
  
          glGenFramebuffers(1, &mSmallFBO);
          glBindFramebuffer(GL_FRAMEBUFFER, mSmallFBO);
          glGenTextures(1, &mSmallColorBuffer);
          glGenRenderbuffers(1, &mSmallDepthStencilBuffer);
          glBindTexture(GL_TEXTURE_2D, mSmallColorBuffer);
          glTexStorage2DEXT(GL_TEXTURE_2D, 1, format, getWindowWidth() / 2, getWindowHeight() / 2);
          glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mSmallColorBuffer, 0);
          glBindRenderbuffer(GL_RENDERBUFFER, mSmallDepthStencilBuffer);
          glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8_OES, getWindowWidth() / 2, getWindowHeight() / 2);
          glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, mSmallDepthStencilBuffer);
          glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, mSmallDepthStencilBuffer);
  
          ASSERT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
          ASSERT_GL_NO_ERROR();
  
          glGenFramebuffers(1, &mColorOnlyFBO);
          glBindFramebuffer(GL_FRAMEBUFFER, mColorOnlyFBO);
          glGenTextures(1, &mColorOnlyColorBuffer);
          glBindTexture(GL_TEXTURE_2D, mColorOnlyColorBuffer);
          glTexStorage2DEXT(GL_TEXTURE_2D, 1, format, getWindowWidth(), getWindowHeight());
          glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mColorOnlyColorBuffer, 0);
  
          ASSERT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
          ASSERT_GL_NO_ERROR();
  
          glGenFramebuffers(1, &mDiffFormatFBO);
          glBindFramebuffer(GL_FRAMEBUFFER, mDiffFormatFBO);
          glGenTextures(1, &mDiffFormatColorBuffer);
          glBindTexture(GL_TEXTURE_2D, mDiffFormatColorBuffer);
          glTexStorage2DEXT(GL_TEXTURE_2D, 1, GL_RGB565, getWindowWidth(), getWindowHeight());
          glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mDiffFormatColorBuffer, 0);
  
          ASSERT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
          ASSERT_GL_NO_ERROR();
  
          glGenFramebuffers(1, &mDiffSizeFBO);
          glBindFramebuffer(GL_FRAMEBUFFER, mDiffSizeFBO);
          glGenTextures(1, &mDiffSizeColorBuffer);
          glBindTexture(GL_TEXTURE_2D, mDiffSizeColorBuffer);
          glTexStorage2DEXT(GL_TEXTURE_2D, 1, format, getWindowWidth()*2, getWindowHeight()*2);
          glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mDiffSizeColorBuffer, 0);
  
          ASSERT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
          ASSERT_GL_NO_ERROR();
  
          if (extensionEnabled("GL_EXT_draw_buffers"))
          {
              glGenFramebuffers(1, &mMRTFBO);
              glBindFramebuffer(GL_FRAMEBUFFER, mMRTFBO);
              glGenTextures(1, &mMRTColorBuffer0);
              glGenTextures(1, &mMRTColorBuffer1);
              glBindTexture(GL_TEXTURE_2D, mMRTColorBuffer0);
              glTexStorage2DEXT(GL_TEXTURE_2D, 1, format, getWindowWidth(), getWindowHeight());
              glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, mMRTColorBuffer0, 0);
              glBindTexture(GL_TEXTURE_2D, mMRTColorBuffer1);
              glTexStorage2DEXT(GL_TEXTURE_2D, 1, format, getWindowWidth(), getWindowHeight());
              glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_2D, mMRTColorBuffer1, 0);
  
              ASSERT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
              ASSERT_GL_NO_ERROR();
          }
  
          if (extensionEnabled("GL_ANGLE_framebuffer_multisample"))
          {
              // Test blit between RGBA and multisampled BGRA
              glGenTextures(1, &mRGBAColorbuffer);
              glBindTexture(GL_TEXTURE_2D, mRGBAColorbuffer);
              glTexStorage2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8_OES, getWindowWidth(), getWindowHeight());
  
              glGenFramebuffers(1, &mRGBAFBO);
              glBindFramebuffer(GL_FRAMEBUFFER, mRGBAFBO);
              glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mRGBAColorbuffer, 0);
  
              ASSERT_GL_NO_ERROR();
              ASSERT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
  
              glGenRenderbuffers(1, &mBGRAMultisampledRenderbuffer);
              glBindRenderbuffer(GL_RENDERBUFFER, mBGRAMultisampledRenderbuffer);
              glRenderbufferStorageMultisampleANGLE(GL_RENDERBUFFER, 1, GL_BGRA8_EXT, getWindowWidth(), getWindowHeight());
  
              glGenFramebuffers(1, &mBGRAMultisampledFBO);
              glBindFramebuffer(GL_FRAMEBUFFER, mBGRAMultisampledFBO);
              glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, mBGRAMultisampledRenderbuffer);
  
              ASSERT_GL_NO_ERROR();
              ASSERT_EQ(GL_FRAMEBUFFER_COMPLETE, glCheckFramebufferStatus(GL_FRAMEBUFFER));
          }
  
          glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
      }
  
      virtual void TearDown()
      {
          glDeleteProgram(mCheckerProgram);
          glDeleteProgram(mBlueProgram);
  
          glDeleteFramebuffers(1, &mUserFBO);
          glDeleteTextures(1, &mUserColorBuffer);
          glDeleteRenderbuffers(1, &mUserDepthStencilBuffer);
  
          glDeleteFramebuffers(1, &mSmallFBO);
          glDeleteTextures(1, &mSmallColorBuffer);
          glDeleteRenderbuffers(1, &mSmallDepthStencilBuffer);
  
          glDeleteFramebuffers(1, &mColorOnlyFBO);
          glDeleteTextures(1, &mSmallDepthStencilBuffer);
  
          glDeleteFramebuffers(1, &mDiffFormatFBO);
          glDeleteTextures(1, &mDiffFormatColorBuffer);
  
          glDeleteFramebuffers(1, &mDiffSizeFBO);
          glDeleteTextures(1, &mDiffSizeColorBuffer);
  
          if (extensionEnabled("GL_EXT_draw_buffers"))
          {
              glDeleteFramebuffers(1, &mMRTFBO);
              glDeleteTextures(1, &mMRTColorBuffer0);
              glDeleteTextures(1, &mMRTColorBuffer1);
          }
  
          if (mRGBAColorbuffer != 0)
          {
              glDeleteTextures(1, &mRGBAColorbuffer);
          }
  
          if (mRGBAFBO != 0)
          {
              glDeleteFramebuffers(1, &mBGRAMultisampledFBO);
          }
  
          if (mBGRAMultisampledRenderbuffer != 0)
          {
              glDeleteRenderbuffers(1, &mBGRAMultisampledRenderbuffer);
          }
  
          if (mBGRAMultisampledFBO != 0)
          {
              glDeleteFramebuffers(1, &mBGRAMultisampledFBO);
          }
  
          ANGLETest::TearDown();
      }
  
      GLuint mCheckerProgram;
      GLuint mBlueProgram;
  
      GLuint mOriginalFBO;
  
      GLuint mUserFBO;
      GLuint mUserColorBuffer;
      GLuint mUserDepthStencilBuffer;
  
      GLuint mSmallFBO;
      GLuint mSmallColorBuffer;
      GLuint mSmallDepthStencilBuffer;
  
      GLuint mColorOnlyFBO;
      GLuint mColorOnlyColorBuffer;
  
      GLuint mDiffFormatFBO;
      GLuint mDiffFormatColorBuffer;
  
      GLuint mDiffSizeFBO;
      GLuint mDiffSizeColorBuffer;
  
      GLuint mMRTFBO;
      GLuint mMRTColorBuffer0;
      GLuint mMRTColorBuffer1;
  
      GLuint mRGBAColorbuffer;
      GLuint mRGBAFBO;
  
      GLuint mBGRAMultisampledRenderbuffer;
      GLuint mBGRAMultisampledFBO;
  };
  
  // Draw to user-created framebuffer, blit whole-buffer color to original framebuffer.
  TEST_F(BlitFramebufferANGLETest, BlitColorToDefault)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.8f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  }
  
  // Draw to system framebuffer, blit whole-buffer color to user-created framebuffer.
  TEST_F(BlitFramebufferANGLETest, ReverseColorBlit)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.8f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(),
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  }
  
  // blit from user-created FBO to system framebuffer, with the scissor test enabled.
  TEST_F(BlitFramebufferANGLETest, ScissoredBlit)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.8f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glScissor(getWindowWidth() / 2, 0, getWindowWidth() / 2, getWindowHeight());
      glEnable(GL_SCISSOR_TEST);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
  
      EXPECT_GL_NO_ERROR();
  
      glDisable(GL_SCISSOR_TEST);
  
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255, 255, 255, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255, 255, 255, 255);
  }
  
  // blit from system FBO to user-created framebuffer, with the scissor test enabled.
  TEST_F(BlitFramebufferANGLETest, ReverseScissoredBlit)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.8f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mUserFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mOriginalFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
      
      glScissor(getWindowWidth() / 2, 0, getWindowWidth() / 2, getWindowHeight());
      glEnable(GL_SCISSOR_TEST);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
  
      EXPECT_GL_NO_ERROR();
  
      glDisable(GL_SCISSOR_TEST);
  
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
      
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255, 255, 255, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255, 255, 255, 255);
  }
  
  // blit from user-created FBO to system framebuffer, using region larger than buffer.
  TEST_F(BlitFramebufferANGLETest, OversizedBlit)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.8f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth() * 2, getWindowHeight() * 2, 0, 0, getWindowWidth() * 2, getWindowHeight() * 2, 
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  }
  
  // blit from system FBO to user-created framebuffer, using region larger than buffer.
  TEST_F(BlitFramebufferANGLETest, ReverseOversizedBlit)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.8f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mUserFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mOriginalFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth() * 2, getWindowHeight() * 2, 0, 0, getWindowWidth() * 2, getWindowHeight() * 2, 
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  }
  
  // blit from user-created FBO to system framebuffer, with depth buffer.
  TEST_F(BlitFramebufferANGLETest, BlitWithDepth)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glDepthMask(GL_TRUE);
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glEnable(GL_DEPTH_TEST);
  
      drawQuad(mCheckerProgram, "position", 0.3f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      // if blit is happening correctly, this quad will not draw, because it is behind the blitted one
      drawQuad(mBlueProgram, "position", 0.8f);
  
      glDisable(GL_DEPTH_TEST);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  }
  
  // blit from system FBO to user-created framebuffer, with depth buffer.
  TEST_F(BlitFramebufferANGLETest, ReverseBlitWithDepth)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glEnable(GL_DEPTH_TEST);
  
      drawQuad(mCheckerProgram, "position", 0.3f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mUserFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mOriginalFBO);
  
      glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      // if blit is happening correctly, this quad will not draw, because it is behind the blitted one
  
      drawQuad(mBlueProgram, "position", 0.8f);
  
      glDisable(GL_DEPTH_TEST);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  }
  
  // blit from one region of the system fbo to another-- this should fail.
  TEST_F(BlitFramebufferANGLETest, BlitSameBufferOriginal)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.3f);
  
      EXPECT_GL_NO_ERROR();
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth() / 2, getWindowHeight(), getWindowWidth() / 2, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_ERROR(GL_INVALID_OPERATION);
  }
  
  // blit from one region of the system fbo to another.
  TEST_F(BlitFramebufferANGLETest, BlitSameBufferUser)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.3f);
  
      EXPECT_GL_NO_ERROR();
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth() / 2, getWindowHeight(), getWindowWidth() / 2, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_ERROR(GL_INVALID_OPERATION);
  }
  
  TEST_F(BlitFramebufferANGLETest, BlitPartialColor)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.5f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth() / 2, getWindowHeight() / 2, 0, getWindowHeight() / 2, getWindowWidth() / 2, getWindowHeight(),
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255, 255, 255, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4, 255, 255, 255, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255, 255, 255, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
  }
  
  TEST_F(BlitFramebufferANGLETest, BlitDifferentSizes)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.5f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mSmallFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(),
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mSmallFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
  
      EXPECT_GL_NO_ERROR();
  }
  
  TEST_F(BlitFramebufferANGLETest, BlitWithMissingAttachments)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mColorOnlyFBO);
  
      glClear(GL_COLOR_BUFFER_BIT);
      drawQuad(mCheckerProgram, "position", 0.3f);
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mColorOnlyFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      // depth blit request should be silently ignored, because the read FBO has no depth attachment
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(),
                             GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, GL_NEAREST); 
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  
      // unlike in the depth blit tests, this *should* draw a blue quad, because depth info
      // has not been copied
      glEnable(GL_DEPTH_TEST);
      drawQuad(mBlueProgram, "position", 0.8f);
      glDisable(GL_DEPTH_TEST);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4,   0,   0, 255, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0,   0, 255, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0,   0, 255, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0,   0, 255, 255);
  }
  
  TEST_F(BlitFramebufferANGLETest, BlitStencil)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT);
      // fill the stencil buffer with 0x1
      glStencilFunc(GL_ALWAYS, 0x1, 0xFF);
      glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
      glEnable(GL_STENCIL_TEST); 
      drawQuad(mCheckerProgram, "position", 0.3f);
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glClearColor(1.0, 1.0, 1.0, 1.0);
      glClearStencil(0x0);
      glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      // depth blit request should be silently ignored, because the read FBO has no depth attachment
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(),
                             GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST); 
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mOriginalFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  
      glStencilFunc(GL_EQUAL, 0x1, 0xFF); // only pass if stencil buffer at pixel reads 0x1
      drawQuad(mBlueProgram, "position", 0.8f); // blue quad will draw if stencil buffer was copied
      glDisable(GL_STENCIL_TEST);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4,   0,   0, 255, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0,   0, 255, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0,   0, 255, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0,   0, 255, 255);
  }
  
  // make sure that attempting to blit a partial depth buffer issues an error
  TEST_F(BlitFramebufferANGLETest, BlitPartialDepthStencil)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.5f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth() / 2, getWindowHeight() / 2, 0, 0, 
                             getWindowWidth() / 2, getWindowHeight() / 2, GL_DEPTH_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_ERROR(GL_INVALID_OPERATION);
  }
  
  // Test blit with MRT framebuffers
  TEST_F(BlitFramebufferANGLETest, BlitMRT)
  {
      if (!extensionEnabled("GL_EXT_draw_buffers"))
      {
          return;
      }
  
      GLenum drawBuffers[] = { GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT };
  
      glBindFramebuffer(GL_FRAMEBUFFER, mMRTFBO);
      glDrawBuffersEXT(2, drawBuffers);
  
      glBindFramebuffer(GL_FRAMEBUFFER, mColorOnlyFBO);
  
      glClear(GL_COLOR_BUFFER_BIT);
      
      drawQuad(mCheckerProgram, "position", 0.8f);
      
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mColorOnlyFBO);
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mMRTFBO);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
      
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_FRAMEBUFFER, mMRTFBO);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  
      glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_2D, 0, 0);
      glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mMRTColorBuffer0, 0);
  
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4,     getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4,     getWindowHeight() / 4,   0, 255,   0, 255);
      EXPECT_PIXEL_EQ(3 * getWindowWidth() / 4, 3 * getWindowHeight() / 4, 255,   0,   0, 255);
      EXPECT_PIXEL_EQ(    getWindowWidth() / 4, 3 * getWindowHeight() / 4,   0, 255,   0, 255);
  
      glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mMRTColorBuffer0, 0);
      glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_2D, mMRTColorBuffer1, 0);
  }
  
  // Make sure that attempts to stretch in a blit call issue an error
  TEST_F(BlitFramebufferANGLETest, ErrorStretching)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.5f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth() / 2, getWindowHeight() / 2, 0, 0, 
                             getWindowWidth(), getWindowHeight(), GL_COLOR_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_ERROR(GL_INVALID_OPERATION);
  }
  
  // Make sure that attempts to flip in a blit call issue an error
  TEST_F(BlitFramebufferANGLETest, ErrorFlipping)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.5f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth() / 2, getWindowHeight() / 2, getWindowWidth() / 2, getWindowHeight() / 2, 
                             0, 0, GL_COLOR_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_ERROR(GL_INVALID_OPERATION);
  }
  
  TEST_F(BlitFramebufferANGLETest, Errors)
  {
      glBindFramebuffer(GL_FRAMEBUFFER, mUserFBO);
  
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  
      drawQuad(mCheckerProgram, "position", 0.5f);
  
      EXPECT_GL_NO_ERROR();
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mOriginalFBO);
      glBindFramebuffer(GL_READ_FRAMEBUFFER_ANGLE, mUserFBO);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(), 
                             GL_COLOR_BUFFER_BIT, GL_LINEAR);
      EXPECT_GL_ERROR(GL_INVALID_ENUM);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(),
                             GL_COLOR_BUFFER_BIT | 234, GL_NEAREST);
      EXPECT_GL_ERROR(GL_INVALID_VALUE);
  
      glBindFramebuffer(GL_DRAW_FRAMEBUFFER_ANGLE, mDiffFormatFBO);
  
      glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(),
                             GL_COLOR_BUFFER_BIT, GL_NEAREST);
      EXPECT_GL_ERROR(GL_INVALID_OPERATION);
  
      if (extensionEnabled("GL_ANGLE_framebuffer_multisample"))
      {
          glBindFramebuffer(GL_READ_FRAMEBUFFER, mBGRAMultisampledFBO);
          glBindFramebuffer(GL_DRAW_FRAMEBUFFER, mRGBAFBO);
          EXPECT_GL_NO_ERROR();
  
          glBlitFramebufferANGLE(0, 0, getWindowWidth(), getWindowHeight(), 0, 0, getWindowWidth(), getWindowHeight(),
                                 GL_COLOR_BUFFER_BIT, GL_NEAREST);
          EXPECT_GL_ERROR(GL_INVALID_OPERATION);
      }
  
  }