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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 CHROME_GPU_GPU_BACKING_STORE_GLX_CONTEXT_H_
#define CHROME_GPU_GPU_BACKING_STORE_GLX_CONTEXT_H_
#include "base/basictypes.h"
#include "base/gfx/size.h"
#include "chrome/gpu/x_util.h"
class GpuThread;
class GpuBackingStoreGLXContext {
public:
explicit GpuBackingStoreGLXContext(GpuThread* gpu_thread);
~GpuBackingStoreGLXContext();
// Returns the context, creating it if necessary, and binding it to the given
// display and window identified by the XID. This will avoid duplicate calls
// to MakeCurrent if the display/XID hasn't changed from the last call.
// Returns NULL on failure.
GLXContext BindContext(XID window_id);
bool BindTextureForScrolling(XID window_id,
const gfx::Size& size);
unsigned int SwapTextureForScrolling(unsigned int old_texture,
const gfx::Size& old_size);
private:
GpuThread* gpu_thread_;
// Set to true when we've tried to create the context. This prevents us from
// trying to initialize the OpenGL context over and over in the failure case.
bool tried_to_init_;
// The OpenGL context. Non-NULL when initialized.
GLXContext context_;
// The last window we've bound our context to. This allows us to avoid
// duplicate "MakeCurrent" calls which are expensive.
XID previous_window_id_;
// The frame buffer object we use to render scrolled images into. We'll set
// is_frame_buffer_bound_ when the FBO is bound so we can perform some checks
// to make sure we're not forgetting to unbind it.
unsigned int frame_buffer_for_scrolling_;
bool is_frame_buffer_bound_;
// The temporary texture we use for scrolling. The ID will be 0 if it is
// uninitialized. Otherwise, this will give the ID and size of an existing
// texture that can be re-used for a temporary buffer for scrolling.
unsigned int temp_scroll_texture_id_;
gfx::Size temp_scroll_texture_size_;
DISALLOW_COPY_AND_ASSIGN(GpuBackingStoreGLXContext);
};
#endif // CHROME_GPU_GPU_BACKING_STORE_GLX_CONTEXT_H_
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