Reland "webgl: use immutable texture for the default FBO."

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 14360 matching lines @@
     GLenum dest_internal_format) {
   GLenum source_type = 0;
   GLenum source_internal_format = 0;
   Texture* source_texture = source_texture_ref->texture();
   source_texture->GetLevelType(source_texture->target(), 0, &source_type,
                                &source_internal_format);
 
   // The destination format should be GL_RGB, or GL_RGBA. GL_ALPHA,
   // GL_LUMINANCE, and GL_LUMINANCE_ALPHA are not supported because they are not
   // renderable on some platforms.
-  bool valid_dest_format = dest_internal_format == GL_RGB ||
-                           dest_internal_format == GL_RGBA ||
-                           dest_internal_format == GL_BGRA_EXT;
+  bool valid_dest_format =
+      dest_internal_format == GL_RGB || dest_internal_format == GL_RGBA ||
+      dest_internal_format == GL_RGB8 || dest_internal_format == GL_RGBA8 ||
+      dest_internal_format == GL_BGRA_EXT ||
+      dest_internal_format == GL_BGRA8_EXT;
   bool valid_source_format =
       source_internal_format == GL_RED || source_internal_format == GL_ALPHA ||
       source_internal_format == GL_RGB || source_internal_format == GL_RGBA ||
+      source_internal_format == GL_RGB8 || source_internal_format == GL_RGBA8 ||
       source_internal_format == GL_LUMINANCE ||
       source_internal_format == GL_LUMINANCE_ALPHA ||
       source_internal_format == GL_BGRA_EXT ||
+      source_internal_format == GL_BGRA8_EXT ||
       source_internal_format == GL_RGB_YCBCR_420V_CHROMIUM ||
       source_internal_format == GL_RGB_YCBCR_422_CHROMIUM;
   if (!valid_source_format || !valid_dest_format) {
     LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION, function_name,
                        "invalid internal format");
     return false;
   }
   return true;
 }
 
@@ skipping 2669 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu