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38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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: mPixelFormatObj(nullptr)
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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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