1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_GL_GL_SHARE_GROUP_H_
6#define UI_GL_GL_SHARE_GROUP_H_
7
8#include <set>
9
10#include "base/basictypes.h"
11#include "base/memory/ref_counted.h"
12#include "ui/gl/gl_export.h"
13
14namespace gfx {
15
16class GLContext;
17
18// A group of GL contexts that share an ID namespace.
19class GL_EXPORT GLShareGroup : public base::RefCounted<GLShareGroup> {
20 public:
21  GLShareGroup();
22
23  // These two should only be called from the constructor and destructor of
24  // GLContext.
25  void AddContext(GLContext* context);
26  void RemoveContext(GLContext* context);
27
28  // Returns a handle to any initialized context in the share group or NULL if
29  // there are no initialized contexts in the share group.
30  void* GetHandle();
31
32  // Returns a pointer to any initialized context in the share group
33  // or NULL if there are no initialized contexts in the share group.
34  GLContext* GetContext();
35
36  // Sets and returns the unique shared GL context. Used for context
37  // virtualization.
38  void SetSharedContext(GLContext* context);
39  GLContext* GetSharedContext();
40
41#if defined(OS_MACOSX)
42  // Sets and returns the ID of the renderer that all contexts in this share
43  // group should be on.
44  void SetRendererID(int renderer_id);
45  int GetRendererID();
46#endif
47
48 private:
49  friend class base::RefCounted<GLShareGroup>;
50
51  ~GLShareGroup();
52
53  // References to GLContext are by raw pointer to avoid a reference count
54  // cycle.
55  typedef std::set<GLContext*> ContextSet;
56  ContextSet contexts_;
57
58  GLContext* shared_context_;
59
60#if defined(OS_MACOSX)
61  int renderer_id_;
62#endif
63
64  DISALLOW_COPY_AND_ASSIGN(GLShareGroup);
65};
66
67}  // namespace gfx
68
69#endif  // UI_GL_GL_SHARE_GROUP_H_
70