Fixed bug with vblank when the compositor is enabled.
Fixed bug with vblank when the compositor is enabled.

ValveSoftware/openvr,GoeGaming/openvr,ChristophHaag/openvr,ValveSoftware/openvr,i3ongmeester/openvr,tapiralec/openvr,ChristophHaag/openvr,ValveSoftware/openvr,ChristophHaag/openvr,i3ongmeester/openvr,GoeGaming/openvr,i3ongmeester/openvr,GoeGaming/openvr,ValveSoftware/openvr,tapiralec/openvr,tapiralec/openvr