gpu: Mailbox emulation with EGLImage

gpu/command_buffer/service/mailbox_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_MAILBOX_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_MAILBOX_MANAGER_H_
 
 #include <functional>
 #include <map>
 
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "gpu/gpu_export.h"
 
 typedef signed char GLbyte;
 
 namespace gpu {
 namespace gles2 {
 
+class MailboxSynchronizer;
 class Texture;
 class TextureManager;
 
 // Manages resources scoped beyond the context or context group level.
 class GPU_EXPORT MailboxManager : public base::RefCounted<MailboxManager> {
  public:
   MailboxManager();
 
   // Look up the texture definition from the named mailbox.
   Texture* ConsumeTexture(unsigned target, const Mailbox& mailbox);
 
   // Put the texture into the named mailbox.
   void ProduceTexture(unsigned target,
                       const Mailbox& mailbox,
                       Texture* texture);
 
+  // Returns whether this manager synchronizes with other instances.
+  bool UsesSync() { return sync_ != NULL; }
+
+  // Used with the MailboxSynchronizer to push/pull texture state to/from
+  // other manager instances.
+  void PushTextureUpdates();
+  void PullTextureUpdates();
+
   // Destroy any mailbox that reference the given texture.
   void TextureDeleted(Texture* texture);
 
  private:
   friend class base::RefCounted<MailboxManager>;
+  friend class MailboxSynchronizer;
 
   ~MailboxManager();
 
   struct TargetName {
     TargetName(unsigned target, const Mailbox& mailbox);
     unsigned target;
     Mailbox mailbox;
   };
+  void InsertTexture(TargetName target_name, Texture* texture);
 
   static bool TargetNameLess(const TargetName& lhs, const TargetName& rhs);
 
   // This is a bidirectional map between mailbox and textures. We can have
   // multiple mailboxes per texture, but one texture per mailbox. We keep an
   // iterator in the MailboxToTextureMap to be able to manage changes to
   // the TextureToMailboxMap efficiently.
   typedef std::multimap<Texture*, TargetName> TextureToMailboxMap;
   typedef std::map<TargetName,
                    TextureToMailboxMap::iterator,
                    std::pointer_to_binary_function<const TargetName&,
                                                    const TargetName&,
                                                    bool> > MailboxToTextureMap;
 
   MailboxToTextureMap mailbox_to_textures_;
   TextureToMailboxMap textures_to_mailboxes_;
 
+  MailboxSynchronizer* sync_;
+
   DISALLOW_COPY_AND_ASSIGN(MailboxManager);
 };
 }  // namespage gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_MAILBOX_MANAGER_H_