ForceDiscreteGPUHelperCGL.h

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/* -*- 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_