internal static extern bool VR_IVRSystem_GetControllerStateWithPose(IntPtr instancePtr, TrackingUniverseOrigin eOrigin, uint unControllerDeviceIndex, ref VRControllerState_t pControllerState, ref TrackedDevicePose_t pTrackedDevicePose);

 public abstract bool PollNextEventWithPose(TrackingUniverseOrigin eOrigin,ref VREvent_t pEvent,ref TrackedDevicePose_t pTrackedDevicePose);

 internal static extern VROverlayError VR_IVROverlay_SetOverlayTransformAbsolute(IntPtr instancePtr, ulong ulOverlayHandle, TrackingUniverseOrigin eTrackingOrigin, ref HmdMatrix34_t pmatTrackingOriginToOverlayTransform);

 public abstract bool GetControllerStateWithPose(TrackingUniverseOrigin eOrigin,uint unControllerDeviceIndex,ref VRControllerState_t pControllerState,ref TrackedDevicePose_t pTrackedDevicePose);

 public abstract void GetDeviceToAbsoluteTrackingPose(TrackingUniverseOrigin eOrigin,float fPredictedSecondsToPhotonsFromNow,TrackedDevicePose_t [] pTrackedDevicePoseArray);

 public abstract bool ComputeOverlayIntersection(ref Compositor_OverlaySettings pSettings,float fAspectRatio,TrackingUniverseOrigin eOrigin,HmdVector3_t vSource,HmdVector3_t vDirection,ref HmdVector2_t pvecIntersectionUV,ref HmdVector3_t pvecIntersectionTrackingSpace);

 public abstract VROverlayError SetOverlayTransformAbsolute(ulong ulOverlayHandle,TrackingUniverseOrigin eTrackingOrigin,ref HmdMatrix34_t pmatTrackingOriginToOverlayTransform);

 internal static extern void VR_IVRCompositor_SetTrackingSpace(IntPtr instancePtr, TrackingUniverseOrigin eOrigin);

 public override void SetTrackingSpace(TrackingUniverseOrigin eOrigin)
 {
     CheckIfUsable();
     VRNativeEntrypoints.VR_IVRCompositor_SetTrackingSpace(m_pVRCompositor,eOrigin);
 }

 internal static extern bool VR_IVRCompositor_ComputeOverlayIntersection(IntPtr instancePtr, ref Compositor_OverlaySettings pSettings, float fAspectRatio, TrackingUniverseOrigin eOrigin, HmdVector3_t vSource, HmdVector3_t vDirection, ref HmdVector2_t pvecIntersectionUV, ref HmdVector3_t pvecIntersectionTrackingSpace);

 internal static extern void VR_IVRSystem_GetDeviceToAbsoluteTrackingPose(IntPtr instancePtr, TrackingUniverseOrigin eOrigin, float fPredictedSecondsToPhotonsFromNow,  [In, Out] TrackedDevicePose_t[] pTrackedDevicePoseArray, uint unTrackedDevicePoseArrayCount);

 internal static extern bool VR_IVRSystem_PollNextEventWithPose(IntPtr instancePtr, TrackingUniverseOrigin eOrigin, ref VREvent_t pEvent, ref TrackedDevicePose_t pTrackedDevicePose);