Split EGLContext in GLContextEGL and GLSurfaceEGL.

Surfaces are independent of contexts in GL. To facilitate sharing of surfaces between processes, I have separated them from the notion of contexts because contexts cannot be shared between processes.

I have started with EGL. GLContextEGL still has a pointer to a surface and still has some surface specific operations that just forward through to it. Once I have refactored all the GLContext implementations in this way, I will remove these pointers and the surface specific opertations.

There will not be "view" and "offscreen" GL contexts. Rather there will be a single context type for each backend which can be made current with a surface that directs output either to a view or offscreen surface.

TEST=try, WebGL puppy works
BUG=none
Review URL: http://codereview.chromium.org/6839008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81512 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 56 insertions, 0 deletions

diff --git a/ui/gfx/gl/gl_surface.h b/ui/gfx/gl/gl_surface.h
new file mode 100644
index 0000000..c0ab1e9
--- /dev/null
+++ b/ui/gfx/gl/gl_surface.h
@@ -0,0 +1,56 @@
+// Copyright (c) 2011 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_GFX_GL_GL_SURFACE_H_
+#define UI_GFX_GL_GL_SURFACE_H_
+#pragma once
+
+#include "build/build_config.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/size.h"
+
+namespace gfx {
+
+// Encapsulates a surface that can be rendered to with GL, hiding platform
+// specific management.
+class GLSurface {
+ public:
+  GLSurface() {}
+  virtual ~GLSurface() {}
+
+  // Destroys the surface.
+  virtual void Destroy() = 0;
+
+  // Returns true if this surface is offscreen.
+  virtual bool IsOffscreen() = 0;
+
+  // Swaps front and back buffers. This has no effect for off-screen
+  // contexts.
+  virtual bool SwapBuffers() = 0;
+
+  // Get the size of the surface.
+  virtual gfx::Size GetSize() = 0;
+
+  // Get the underlying platform specific surface "handle".
+  virtual void* GetHandle() = 0;
+
+  // Returns the internal frame buffer object name if the surface is backed by
+  // FBO. Otherwise returns 0.
+  virtual unsigned int GetBackingFrameBufferObject();
+
+#if !defined(OS_MACOSX)
+  // Create a surface corresponding to a view.
+  static GLSurface* CreateViewGLContext(gfx::PluginWindowHandle window);
+#endif
+
+  // Create a surface used for offscreen rendering.
+  static GLSurface* CreateOffscreenGLContext(const gfx::Size& size);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GLSurface);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_GL_GL_SURFACE_H_