Taking Advantage of Multiple GPUs

Your application may be running on a Mac that contains more than one graphics processor. Understand how to adapt to renderer changes and the actions to take when the user drags your app from one screen to another. Discover how your application can drive multiple GPUs with OpenGL and OpenCL simultaneously, and see how to leverage the low-level power of IOSurface to share media data between them.

WWDC 2010 - macOS