Forcing Machine to Use Dedicated Graphics Card?

The easiest way from C++ to ensure that the dedicated graphics card is used instead of chipset switchable graphics under Windows is to export the following symbols (MSVC sample code):

Enable dedicated graphics for NVIDIA:

extern "C" 
{
  __declspec(dllexport) unsigned long NvOptimusEnablement = 0x00000001;
}

Enable dedicated graphics for AMD Radeon:

extern "C"
{
  __declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
}

Caveat: If the user has created a profile for the application to use integrated chipset, then these will not work.

I am unsure if this would work similarly under Linux / MacOS (unlikely).

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