Attaching an image to many color attachment points is unsupported

gpu/command_buffer/service/framebuffer_manager.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 33 matching lines @@
     virtual GLuint object_name() const = 0;
     virtual bool cleared() const = 0;
     virtual void SetCleared(
         RenderbufferManager* renderbuffer_manager,
         TextureManager* texture_manager,
         bool cleared) = 0;
     virtual bool IsPartiallyCleared() const = 0;
     virtual bool IsTextureAttachment() const = 0;
     virtual bool IsRenderbufferAttachment() const = 0;
     virtual bool IsTexture(TextureRef* texture) const = 0;
-    virtual bool IsRenderbuffer(
-        Renderbuffer* renderbuffer) const = 0;
+    virtual bool IsRenderbuffer(Renderbuffer* renderbuffer) const = 0;
+    virtual bool IsSameAttachment(const Attachment* attachment) const = 0;
     virtual bool Is3D() const = 0;
 
     // If it's a 3D texture attachment, return true if
     // FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER is smaller than the number of
     // layers in the texture.
     virtual bool IsLayerValid() const = 0;
 
     virtual bool CanRenderTo(const FeatureInfo* feature_info) const = 0;
     virtual void DetachFromFramebuffer(Framebuffer* framebuffer) const = 0;
     virtual bool ValidForAttachmentType(GLenum attachment_type,
@@ skipping 11 matching lines @@
   };
 
   Framebuffer(FramebufferManager* manager, GLuint service_id);
 
   GLuint service_id() const {
     return service_id_;
   }
 
   bool HasUnclearedAttachment(GLenum attachment) const;
   bool HasUnclearedColorAttachments() const;
+  bool HasDuplicateColorAttachments() const;

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

nit: HasDuplicatedAttachments.

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

Done.

 
   bool HasSRGBAttachments() const;
 
   void ClearUnclearedIntOr3DTexturesOrPartiallyClearedTextures(
       GLES2Decoder* decoder,
       TextureManager* texture_manager);
 
   bool HasUnclearedIntRenderbufferAttachments() const;
 
   void ClearUnclearedIntRenderbufferAttachments(
@@ skipping 280 matching lines @@
 
   scoped_refptr<FramebufferCompletenessCache> framebuffer_combo_complete_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(FramebufferManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_