michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef ForceDiscreteGPUHelperCGL_h_
michael@0: #define ForceDiscreteGPUHelperCGL_h_
michael@0: 
michael@0: #include <OpenGL/OpenGL.h>
michael@0: 
michael@0: /** This RAII helper guarantees that we're on the discrete GPU during its lifetime.
michael@0:  * 
michael@0:  * As long as any ForceDiscreteGPUHelperCGL object is alive, we're on the discrete GPU.
michael@0:  */
michael@0: class ForceDiscreteGPUHelperCGL
michael@0: {
michael@0:     CGLPixelFormatObj mPixelFormatObj;
michael@0: 
michael@0: public:
michael@0:     ForceDiscreteGPUHelperCGL()
michael@0:     {
michael@0:         // the code in this function is taken from Chromium, src/ui/gfx/gl/gl_context_cgl.cc, r122013
michael@0:         // BSD-style license, (c) The Chromium Authors
michael@0:         CGLPixelFormatAttribute attribs[1];
michael@0:         attribs[0] = static_cast<CGLPixelFormatAttribute>(0);
michael@0:         GLint num_pixel_formats = 0;
michael@0:         CGLChoosePixelFormat(attribs, &mPixelFormatObj, &num_pixel_formats);
michael@0:     }
michael@0: 
michael@0:     ~ForceDiscreteGPUHelperCGL()
michael@0:     {
michael@0:         CGLReleasePixelFormat(mPixelFormatObj);
michael@0:     }
michael@0: };
michael@0: 
michael@0: #endif // ForceDiscreteGPUHelperCGL_h_