Allow textures to be moved from one GL context group to another.

gpu/command_buffer/service/display.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_DISPLAY_H_
+#define GPU_COMMAND_BUFFER_SERVICE_DISPLAY_H_
+
+#include <queue>
+
+#include "base/hash_tables.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "gpu/command_buffer/service/gl_utils.h"
+#include "gpu/gpu_export.h"
+
+namespace gpu {
+namespace gles2 {
+
+class TextureDefinition;
+class TextureManager;
+
+struct MailboxName {
+  int32 components[32];
+};
+
+class GPU_EXPORT Display : public base::RefCounted<Display> {

[Ken Russell (switch to Gerrit), 2012/04/23 20:12:00]

Is "Display" the best name? Maybe something more concrete, like
CrossContextSharedTextureManager?

+ public:
+  Display();
+
+  TextureDefinition* ConsumeTexture(GLenum target, const MailboxName& name);
+
+  void ProduceTexture(GLenum target,
+                      const MailboxName& name,
+                      TextureDefinition* definition,
+                      TextureManager* owner);
+
+  void DestroyOwnedTextures(TextureManager* owner, bool have_context);
+
+ private:
+  friend class base::RefCounted<Display>;
+
+  struct TargetName {
+    TargetName(GLenum target, const MailboxName& name);
+    GLenum target;
+    MailboxName name;
+  };
+
+  struct TargetNameCompare {
+    enum {
+      bucket_size = 4,
+      min_buckets = 8
+    };
+    size_t operator() (const TargetName& key) const;
+    int operator() (const TargetName& lhs, const TargetName& rhs) const;
+  };
+
+  struct OwnedTextureDefinition {
+    OwnedTextureDefinition(TextureDefinition* definition,
+                           TextureManager* owner);
+    linked_ptr<TextureDefinition> definition;
+    TextureManager* owner;
+  };
+
+  typedef base::hash_map<TargetName, OwnedTextureDefinition, TargetNameCompare>
+      TextureDefinitionMap;
+
+  ~Display();
+
+  TextureDefinitionMap textures_;
+
+  DISALLOW_COPY_AND_ASSIGN(Display);
+};
+
+}  // namespage gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_DISPLAY_H_
+
+