Platform specific function to specify the application window whose output will be
displayed on the HMD. Only used if the ovrHmdCap_ExtendDesktop flag is false.
Windows: SwapChain associated with this window will be displayed on the HMD.
Specify 'destMirrorRect' in window coordinates to indicate an area
of the render target output that will be mirrored from 'sourceRenderTargetRect'.
Null pointers mean "full size".
@note Source and dest mirror rects are not yet implemented.
Platform specific function to specify the application window whose output will be displayed on the HMD. Only used if the ovrHmdCap_ExtendDesktop flag is false. Windows: SwapChain associated with this window will be displayed on the HMD. Specify 'destMirrorRect' in window coordinates to indicate an area of the render target output that will be mirrored from 'sourceRenderTargetRect'. Null pointers mean "full size". @note Source and dest mirror rects are not yet implemented.