text: /*********************************************************************************
   *
   * Inviwo - Interactive Visualization Workshop
   *
   * Copyright (c) 2013-2017 Inviwo Foundation
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   * list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   * 
   *********************************************************************************/
  
  #ifndef IVW_DEFAULTTOHIGHPERFORMANCEGPU_H
  #define IVW_DEFAULTTOHIGHPERFORMANCEGPU_H
  // Include this file once in your main.cpp to enable the application 
  // to default to the high performance GPU if multiple ones are 
  // available on the system.
  
  #ifdef WIN32
  // Prefer high performance GPU for systems with multiple GPUs
  // http://developer.download.nvidia.com/devzone/devcenter/gamegraphics/files/OptimusRenderingPolicies.pdf
  // From Nvidia 302 drivers: The Optimus driver looks for
  // the existence and value of the export. Only the LSB of the DWORD matters at this time.
  // A value of 0x00000001 indicates that rendering should be performed using High
  // Performance Graphics. A value of 0x00000000 indicates that this method should be
  // ignored.
  
  // Corresponding for AMD
  // http://stackoverflow.com/questions/17458803/amd-equivalent-to-nvoptimusenablement
  // Select the high performance GPU as long as no profile exists 
  // that assigns the application to another GPU.
  
  // unsigned long == DWORD, so we don't have to include windows.h for the DWORD define.
  
  extern "C" {
      __declspec(dllexport) unsigned long NvOptimusEnablement = 0x00000001;
      __declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
  }
  
  #endif
  
  #endif // IVW_DEFAULTTOHIGHPERFORMANCEGPU_H
  