gpu: Mailbox emulation with EGLImage

gpu/command_buffer/service/mailbox_synchronizer.h

+// Copyright (c) 2014 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_SYNCHRONIZER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_MAILBOX_SYNCHRONIZER_H_
+
+#include "gpu/command_buffer/common/mailbox.h"
+
+#include <map>
+#include <set>
+
+#include "base/memory/linked_ptr.h"
+#include "base/synchronization/lock.h"
+#include "gpu/command_buffer/service/texture_definition.h"
+#include "gpu/gpu_export.h"
+
+namespace gpu {
+namespace gles2 {
+
+class MailboxManager;
+class Texture;
+
+// A thread-safe proxy that can be used to emulate texture sharing across
+// share-groups.
+class MailboxSynchronizer {
+ public:
+  ~MailboxSynchronizer();
+
+  GPU_EXPORT static bool Initialize();
+  GPU_EXPORT static void Terminate();
+  static MailboxSynchronizer* GetInstance();
+
+  // Create a texture from a globally visible mailbox.
+  Texture* CreateTextureFromMailbox(MailboxManager* manager,
+                                    unsigned target,
+                                    const Mailbox& mailbox);
+
+  void PushTextureUpdates(MailboxManager* manager);
+  void PullTextureUpdates(MailboxManager* manager);
+
+  void TextureDeleted(MailboxManager* manager,
+                      unsigned target,
+                      const Mailbox& mailbox);
+
+ private:
+  MailboxSynchronizer();
+
+  struct TargetName {
+    TargetName(unsigned target, const Mailbox& mailbox);
+    bool operator<(const TargetName& rhs) const {
+      return memcmp(this, &rhs, sizeof(rhs)) < 0;
+    }
+    bool operator!=(const TargetName& rhs) const {
+      return memcmp(this, &rhs, sizeof(rhs)) != 0;
+    }
+    unsigned target;
+    Mailbox mailbox;
+  };
+
+  base::Lock lock_;
+
+  struct GlobalMailbox {
+    GlobalMailbox(const TextureDefinition& definition)

[piman, 2014/03/08 01:03:11]

nit: explicit

[no sievers, 2014/03/12 18:45:36]

Done.

+        : definition(definition) {}
+    TextureDefinition definition;
+    std::set<MailboxManager*> refs;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(GlobalMailbox);
+  };
+  typedef std::map<TargetName, linked_ptr<GlobalMailbox> > MailboxMap;
+
+  MailboxMap mailboxes_;
+
+  DISALLOW_COPY_AND_ASSIGN(MailboxSynchronizer);
+};
+
+}  // namespage gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_MAILBOX_SYNCHRONIZER_H_
+