Called at the beginning of the frame on the rendering thread. Pass frameIndex == 0 if ovrHmd_GetFrameTiming isn't being used. Otherwise, pass the same frame index as was used for GetFrameTiming on the main thread.
See Implementation
Called at the beginning of the frame on the rendering thread. Pass frameIndex == 0 if ovrHmd_GetFrameTiming isn't being used. Otherwise, pass the same frame index as was used for GetFrameTiming on the main thread.