Attaching an image to many color attachment points is unsupported

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 7128 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 (framebuffer->HasDuplicateColorAttachments()) {

[Zhenyao Mo, 2016/07/19 20:39:15]

This should go inside Framebuffer::IsPossiblyComplete().

[qiankun, 2016/07/20 08:53:33]

Done.

+    return GL_FRAMEBUFFER_UNSUPPORTED;
+  }
+
   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 10245 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