ui/gl/gl_share_group.h

   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
  14 namespace gfx {
  15
  16 class GLContext;
  17
  18 // A group of GL contexts that share an ID namespace.
  19 class 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_