1 files changed, 95 insertions, 0 deletions
diff --git a/ui/gl/gl_context.h b/ui/gl/gl_context.h
new file mode 100644
index 0000000..dc76c00
--- /dev/null
+++ b/ui/gl/gl_context.h
@@ -0,0 +1,95 @@
+// 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_CONTEXT_H_
+#define UI_GL_GL_CONTEXT_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "ui/gl/gl_share_group.h"
+#include "ui/gl/gpu_preference.h"
+
+namespace gfx {
+
+class GLSurface;
+
+// Encapsulates an OpenGL context, hiding platform specific management.
+class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
+ public:
+  explicit GLContext(GLShareGroup* share_group);
+
+  // Initializes the GL context to be compatible with the given surface. The GL
+  // context can be made with other surface's of the same type. The compatible
+  // surface is only needed for certain platforms like WGL, OSMesa and GLX. It
+  // should be specific for all platforms though.
+  virtual bool Initialize(
+      GLSurface* compatible_surface, GpuPreference gpu_preference) = 0;
+
+  // Destroys the GL context.
+  virtual void Destroy() = 0;
+
+  // Makes the GL context and a surface current on the current thread.
+  virtual bool MakeCurrent(GLSurface* surface) = 0;
+
+  // Releases this GL context and surface as current on the current thread.
+  virtual void ReleaseCurrent(GLSurface* surface) = 0;
+
+  // Returns true if this context and surface is current. Pass a null surface
+  // if the current surface is not important.
+  virtual bool IsCurrent(GLSurface* surface) = 0;
+
+  // Get the underlying platform specific GL context "handle".
+  virtual void* GetHandle() = 0;
+
+  // Set swap interval. This context must be current.
+  virtual void SetSwapInterval(int interval) = 0;
+
+  // Returns space separated list of extensions. The context must be current.
+  virtual std::string GetExtensions();
+
+  // Returns whether the current context supports the named extension. The
+  // context must be current.
+  bool HasExtension(const char* name);
+
+  GLShareGroup* share_group();
+
+  // Create a GL context that is compatible with the given surface.
+  // |share_group|, if non-NULL, is a group of contexts which the
+  // internally created OpenGL context shares textures and other resources.
+  static scoped_refptr<GLContext> CreateGLContext(
+      GLShareGroup* share_group,
+      GLSurface* compatible_surface,
+      GpuPreference gpu_preference);
+
+  static bool LosesAllContextsOnContextLost();
+
+  static bool SupportsDualGpus();
+
+  static GLContext* GetCurrent();
+
+  virtual bool WasAllocatedUsingARBRobustness();
+
+ protected:
+  virtual ~GLContext();
+  static void SetCurrent(GLContext* context, GLSurface* surface);
+
+  // Initialize function pointers to extension functions in the GL
+  // implementation. Should be called immediately after this context is made
+  // current.
+  bool InitializeExtensionBindings();
+
+ private:
+  friend class base::RefCounted<GLContext>;
+
+  scoped_refptr<GLShareGroup> share_group_;
+
+  DISALLOW_COPY_AND_ASSIGN(GLContext);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_GL_CONTEXT_H_