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// 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 UI_GL_GL_SHARE_GROUP_H_
#define UI_GL_GL_SHARE_GROUP_H_
#include <set>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "ui/gl/gl_export.h"
namespace gfx {
class GLContext;
// A group of GL contexts that share an ID namespace.
class GL_EXPORT GLShareGroup : public base::RefCounted<GLShareGroup> {
public:
GLShareGroup();
// These two should only be called from the constructor and destructor of
// GLContext.
void AddContext(GLContext* context);
void RemoveContext(GLContext* context);
// Returns a handle to any initialized context in the share group or NULL if
// there are no initialized contexts in the share group.
void* GetHandle();
// Returns a pointer to any initialized context in the share group
// or NULL if there are no initialized contexts in the share group.
virtual GLContext* GetContext();
// Sets and returns the unique shared GL context. Used for context
// virtualization.
void SetSharedContext(GLContext* context);
GLContext* GetSharedContext();
#if defined(OS_MACOSX)
// Sets and returns the ID of the renderer that all contexts in this share
// group should be on.
void SetRendererID(int renderer_id);
int GetRendererID();
#endif
protected:
virtual ~GLShareGroup();
virtual void AboutToAddFirstContext() { }
private:
friend class base::RefCounted<GLShareGroup>;
// References to GLContext are by raw pointer to avoid a reference count
// cycle.
typedef std::set<GLContext*> ContextSet;
ContextSet contexts_;
GLContext* shared_context_;
#if defined(OS_MACOSX)
int renderer_id_;
#endif
DISALLOW_COPY_AND_ASSIGN(GLShareGroup);
};
} // namespace gfx
#endif // UI_GL_GL_SHARE_GROUP_H_
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