[Command buffer] workaround the framebuffer completeness bug for Intel Mac

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 7524 matching lines @@
 GLenum GLES2DecoderImpl::DoCheckFramebufferStatus(GLenum target) {
   Framebuffer* framebuffer =
       GetFramebufferInfoForTarget(target);
   if (!framebuffer) {
     return GL_FRAMEBUFFER_COMPLETE;
   }
   GLenum completeness = framebuffer->IsPossiblyComplete(feature_info_.get());
   if (completeness != GL_FRAMEBUFFER_COMPLETE) {
     return completeness;
   }
+
+  if (workarounds().adjust_framebuffer_complete_status &&
+      SupportsDrawBuffers()) {
+    switch (target) {
+      case GL_READ_FRAMEBUFFER:
+        if (framebuffer->ReadBufferHasNoImage() &&
+            framebuffer->ColorBuffersHaveImage()) {
+          return GL_FRAMEBUFFER_COMPLETE;
+        }
+        break;
+      case GL_DRAW_FRAMEBUFFER:
+      case GL_FRAMEBUFFER:
+        if (framebuffer->DrawBuffersHaveNoImage() &&
+            framebuffer->ColorBuffersHaveImage()) {
+          return GL_FRAMEBUFFER_COMPLETE;
+        }
+        break;
+      default:
+        NOTREACHED();
+        break;
+    }
+  }
+
   return framebuffer->GetStatus(texture_manager(), target);
 }
 
 void GLES2DecoderImpl::DoFramebufferTexture2D(
     GLenum target, GLenum attachment, GLenum textarget,
     GLuint client_texture_id, GLint level) {
   DoFramebufferTexture2DCommon(
     "glFramebufferTexture2D", target, attachment,
     textarget, client_texture_id, level, 0);
 }
@@ skipping 11290 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