1 files changed, 52 insertions, 0 deletions
diff --git a/ui/gl/gl_share_group.h b/ui/gl/gl_share_group.h
new file mode 100644
index 0000000..2b39ba5
--- /dev/null
+++ b/ui/gl/gl_share_group.h
@@ -0,0 +1,52 @@
+// 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_
+#pragma once
+
+#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.
+  GLContext* GetContext();
+
+ private:
+  friend class base::RefCounted<GLShareGroup>;
+
+  ~GLShareGroup();
+
+  // References to GLContext are by raw pointer to avoid a reference count
+  // cycle.
+  typedef std::set<GLContext*> ContextSet;
+  ContextSet contexts_;
+
+  DISALLOW_COPY_AND_ASSIGN(GLShareGroup);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_GL_SHARE_GROUP_H_