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Diffstat (limited to '')
| -rw-r--r-- | gfx/gl/ForceDiscreteGPUHelperCGL.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/gfx/gl/ForceDiscreteGPUHelperCGL.h b/gfx/gl/ForceDiscreteGPUHelperCGL.h new file mode 100644 index 0000000000..523d76def3 --- /dev/null +++ b/gfx/gl/ForceDiscreteGPUHelperCGL.h @@ -0,0 +1,34 @@ +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef ForceDiscreteGPUHelperCGL_h_ +#define ForceDiscreteGPUHelperCGL_h_ + +#include <OpenGL/OpenGL.h> + +/** This RAII helper guarantees that we're on the discrete GPU during its + * lifetime. + * + * As long as any ForceDiscreteGPUHelperCGL object is alive, we're on the + * discrete GPU. + */ +class ForceDiscreteGPUHelperCGL { + CGLPixelFormatObj mPixelFormatObj; + + public: + ForceDiscreteGPUHelperCGL() : mPixelFormatObj(nullptr) { + // the code in this function is taken from Chromium, + // src/ui/gfx/gl/gl_context_cgl.cc, r122013 + // BSD-style license, (c) The Chromium Authors + CGLPixelFormatAttribute attribs[1]; + attribs[0] = static_cast<CGLPixelFormatAttribute>(0); + GLint num_pixel_formats = 0; + CGLChoosePixelFormat(attribs, &mPixelFormatObj, &num_pixel_formats); + } + + ~ForceDiscreteGPUHelperCGL() { CGLReleasePixelFormat(mPixelFormatObj); } +}; + +#endif // ForceDiscreteGPUHelperCGL_h_ |