bool GetTimeSinceLastVsync( float *pfSecondsSinceLastVsync, uint64_t *pulFrameCounter )

Returns the number of elapsed seconds since the last recorded vsync event. This will come from a vsync timer event in the timer if possible or from the application-reported time if that is not available. If no vsync times are available the function will return zero for vsync time and frame counter and return false from the method.

• pfSecondsSinceLastVsync - Fractional number of seconds since the last vsync event. This will never exceed the length of a single frame
• pulFrameCounter - The number of frames since vrserver.exe started.