Add R_8 GPU memory buffers format.

gpu/command_buffer/tests/gl_gpu_memory_buffer_unittest.cc

 // 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/gl2chromium.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 
 #include "base/bind.h"
@@ skipping 62 matching lines @@
   varying vec2 v_texCoord;
   void main() {
     gl_FragColor = texture2D(a_texture, v_texCoord);
   }
 );
 // clang-format on
 
 std::vector<uint8> GetTexturePixel(const gfx::GpuMemoryBuffer::Format format) {
   std::vector<uint8> pixel;
   switch (format) {
+    case gfx::GpuMemoryBuffer::R_8:
+      pixel.push_back(255u);
+      return pixel;
     case gfx::GpuMemoryBuffer::RGBA_8888:
       pixel.push_back(255u);
       pixel.push_back(0u);
       pixel.push_back(0u);
       pixel.push_back(255u);
       return pixel;
     case gfx::GpuMemoryBuffer::BGRA_8888:
       pixel.push_back(0u);
       pixel.push_back(0u);
       pixel.push_back(255u);
@@ skipping 10 matching lines @@
   }
 
   NOTREACHED();
   return std::vector<uint8>();
 }
 
 std::vector<uint8> GetFramebufferPixel(
     const gfx::GpuMemoryBuffer::Format format) {
   std::vector<uint8> pixel;
   switch (format) {
+    case gfx::GpuMemoryBuffer::R_8:
     case gfx::GpuMemoryBuffer::RGBA_8888:
     case gfx::GpuMemoryBuffer::BGRA_8888:
       pixel.push_back(255u);
       pixel.push_back(0u);
       pixel.push_back(0u);
       pixel.push_back(255u);
       return pixel;
     case gfx::GpuMemoryBuffer::ATC:
     case gfx::GpuMemoryBuffer::ATCIA:
     case gfx::GpuMemoryBuffer::DXT1:
     case gfx::GpuMemoryBuffer::DXT5:
     case gfx::GpuMemoryBuffer::ETC1:
     case gfx::GpuMemoryBuffer::RGBX_8888:
       NOTREACHED();
       return std::vector<uint8>();
   }
 
   NOTREACHED();
   return std::vector<uint8>();
 }
 
 GLenum InternalFormat(gfx::GpuMemoryBuffer::Format format) {
   switch (format) {
+    case gfx::GpuMemoryBuffer::R_8:
+      return GL_R8;
     case gfx::GpuMemoryBuffer::RGBA_8888:
       return GL_RGBA;
     case gfx::GpuMemoryBuffer::BGRA_8888:
       return GL_BGRA_EXT;
     case gfx::GpuMemoryBuffer::ATC:
     case gfx::GpuMemoryBuffer::ATCIA:
     case gfx::GpuMemoryBuffer::DXT1:
     case gfx::GpuMemoryBuffer::DXT5:
     case gfx::GpuMemoryBuffer::ETC1:
     case gfx::GpuMemoryBuffer::RGBX_8888:
       NOTREACHED();
       return 0;
   }
 
   NOTREACHED();
   return 0;
 }
 
 }  // namespace
 
 // An end to end test that tests the whole GpuMemoryBuffer lifecycle.
 TEST_P(GpuMemoryBufferTest, Lifecycle) {
+  ASSERT_TRUE((GetParam() != gfx::GpuMemoryBuffer::R_8) ||

[reveman, 2015/04/08 02:57:28]

We should consider adding a histogram to find out how common it is that this is
missing in the wild. This patch does that:
https://codereview.chromium.org/1068133002

+              gl_.GetCapabilities().texture_rg);
+
   GLuint texture_id = 0;
   glGenTextures(1, &texture_id);
   ASSERT_NE(0u, texture_id);
   glBindTexture(GL_TEXTURE_2D, texture_id);
   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 
   // Create the gpu memory buffer.
@@ skipping 65 matching lines @@
   glDeleteProgram(program);
   glDeleteShader(vertex_shader);
   glDeleteShader(fragment_shader);
   glDeleteBuffers(1, &vbo);
   glDestroyImageCHROMIUM(image_id);
   glDeleteTextures(1, &texture_id);
 }
 
 INSTANTIATE_TEST_CASE_P(GpuMemoryBufferTests,
                         GpuMemoryBufferTest,
-                        ::testing::Values(gfx::GpuMemoryBuffer::RGBA_8888,
+                        ::testing::Values(gfx::GpuMemoryBuffer::R_8,
+                                          gfx::GpuMemoryBuffer::RGBA_8888,
                                           gfx::GpuMemoryBuffer::BGRA_8888));
 
 }  // namespace gles2
 }  // namespace gpu