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// Copyright (c) 2010 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 APP_GFX_GL_GL_CONTEXT_H_
#define APP_GFX_GL_GL_CONTEXT_H_
#pragma once
#include "build/build_config.h"
#include "gfx/native_widget_types.h"
#include "gfx/size.h"
namespace gfx {
// Encapsulates an OpenGL context, hiding platform specific management.
class GLContext {
public:
GLContext() {}
virtual ~GLContext() {}
// Destroys the GL context.
virtual void Destroy() = 0;
// Makes the GL context current on the current thread.
virtual bool MakeCurrent() = 0;
// Returns true if this context is current.
virtual bool IsCurrent() = 0;
// Returns true if this context is offscreen.
virtual bool IsOffscreen() = 0;
// Swaps front and back buffers. This has no effect for off-screen
// contexts.
virtual void SwapBuffers() = 0;
// Get the size of the back buffer.
virtual gfx::Size GetSize() = 0;
// Get the underlying platform specific GL context "handle".
virtual void* GetHandle() = 0;
// Returns whether the current context supports the named extension. The
// context must be current.
virtual bool HasExtension(const char* name);
static bool InitializeOneOff();
#if !defined(OS_MACOSX)
// Create a GL context that renders directly to a view.
static GLContext* CreateViewGLContext(gfx::PluginWindowHandle window,
bool multisampled);
#endif
// Create a GL context used for offscreen rendering. It is initially backed by
// a 1x1 pbuffer. Use it to create an FBO to do useful rendering.
// |share_context|, if non-NULL, is a context which the internally created
// OpenGL context shares textures and other resources.
static GLContext* CreateOffscreenGLContext(GLContext* shared_context);
protected:
bool InitializeCommon();
private:
DISALLOW_COPY_AND_ASSIGN(GLContext);
};
} // namespace gfx
#endif // APP_GFX_GL_GL_CONTEXT_H_
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