Implement EXT_draw_buffers WebGL extention support in command buffer.

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 "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
@@ skipping 22 matching lines @@
     virtual bool cleared() const = 0;
     virtual void SetCleared(
         RenderbufferManager* renderbuffer_manager,
         TextureManager* texture_manager,
         bool cleared) = 0;
     virtual bool IsTexture(Texture* texture) const = 0;
     virtual bool IsRenderbuffer(
         Renderbuffer* renderbuffer) const = 0;
     virtual bool CanRenderTo() const = 0;
     virtual void DetachFromFramebuffer() const = 0;
-    virtual bool ValidForAttachmentType(GLenum attachment_type) = 0;
+    virtual bool ValidForAttachmentType(
+        GLenum attachment_type, uint32 max_color_attachments) = 0;
     virtual void AddToSignature(
         TextureManager* texture_manager, std::string* signature) const = 0;
 
    protected:
     friend class base::RefCounted<Attachment>;
     virtual ~Attachment() {}
   };
 
   Framebuffer(FramebufferManager* manager, GLuint service_id);
 
@@ skipping 53 matching lines @@
   // not mean the real OpenGL will consider it framebuffer complete. It just
   // means it passed our tests.
   GLenum IsPossiblyComplete() const;
 
   // Implements optimized glGetFramebufferStatus.
   GLenum GetStatus(TextureManager* texture_manager, GLenum target) const;
 
   // Check all attachments are cleared
   bool IsCleared() const;
 
+  GLenum GetDrawBuffer(GLenum draw_buffer) const;
+
+  void SetDrawBuffers(GLsizei n, const GLenum* bufs);
+
   static void ClearFramebufferCompleteComboMap();
 
  private:
   friend class FramebufferManager;
   friend class base::RefCounted<Framebuffer>;
 
   ~Framebuffer();
 
   void MarkAsDeleted();
 
@@ skipping 26 matching lines @@
 
   // A map of attachments.
   typedef base::hash_map<GLenum, scoped_refptr<Attachment> > AttachmentMap;
   AttachmentMap attachments_;
 
   // A map of successful frame buffer combos. If it's in the map
   // it should be FRAMEBUFFER_COMPLETE.
   typedef base::hash_map<std::string, bool> FramebufferComboCompleteMap;
   static FramebufferComboCompleteMap* framebuffer_combo_complete_map_;
 
+  scoped_array<GLenum> draw_buffers_;
+
   DISALLOW_COPY_AND_ASSIGN(Framebuffer);
 };
 
 // This class keeps track of the frambebuffers and their attached renderbuffers
 // so we can correctly clear them.
 class GPU_EXPORT FramebufferManager {
  public:
-  FramebufferManager();
+  FramebufferManager(uint32 max_draw_buffers, uint32 max_color_attachments);
   ~FramebufferManager();
 
   // Must call before destruction.
   void Destroy(bool have_context);
 
   // Creates a Framebuffer for the given framebuffer.
   void CreateFramebuffer(GLuint client_id, GLuint service_id);
 
   // Gets the framebuffer info for the given framebuffer.
   Framebuffer* GetFramebuffer(GLuint client_id);
@@ skipping 33 matching lines @@
   // Incremented anytime anything changes that might effect framebuffer
   // state.
   unsigned framebuffer_state_change_count_;
 
   // Counts the number of Framebuffer allocated with 'this' as its manager.
   // Allows to check no Framebuffer will outlive this.
   unsigned int framebuffer_count_;
 
   bool have_context_;
 
+  uint32 max_draw_buffers_;
+  uint32 max_color_attachments_;
+
   DISALLOW_COPY_AND_ASSIGN(FramebufferManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_