2012-03-01 00:49:55 +04:00
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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2012-03-02 21:00:12 +04:00
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* Portions created by the Initial Developer are Copyright (C) 2012
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2012-03-01 00:49:55 +04:00
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef ForceDiscreteGPUHelperCGL_h_
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#define ForceDiscreteGPUHelperCGL_h_
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#include <OpenGL/OpenGL.h>
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/** This RAII helper guarantees that we're on the discrete GPU during its lifetime.
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*
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* As long as any ForceDiscreteGPUHelperCGL object is alive, we're on the discrete GPU.
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*/
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class ForceDiscreteGPUHelperCGL
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{
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CGLPixelFormatObj mPixelFormatObj;
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public:
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ForceDiscreteGPUHelperCGL()
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{
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// the code in this function is taken from Chromium, src/ui/gfx/gl/gl_context_cgl.cc, r122013
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// BSD-style license, (c) The Chromium Authors
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CGLPixelFormatAttribute attribs[1];
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attribs[0] = static_cast<CGLPixelFormatAttribute>(0);
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GLint num_pixel_formats = 0;
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CGLChoosePixelFormat(attribs, &mPixelFormatObj, &num_pixel_formats);
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}
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~ForceDiscreteGPUHelperCGL()
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{
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CGLReleasePixelFormat(mPixelFormatObj);
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}
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};
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#endif // ForceDiscreteGPUHelperCGL_h_
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