Initialize Oculus pose after reset.

Without this change the pose is uninitialized during the first frame which causes Oculus timewarp to warp the output in crazy ways.

src/ovr.cpp

@@ -175,6 +175,13 @@ ovrError:
 			m_texture[1].Header.RenderViewport = rect;
 
 			m_timing = ovrHmd_BeginFrame(m_hmd, 0);
+#if OVR_VERSION > OVR_VERSION_042
+			m_pose[0] = ovrHmd_GetHmdPosePerEye(m_hmd, ovrEye_Left);
+			m_pose[1] = ovrHmd_GetHmdPosePerEye(m_hmd, ovrEye_Right);
+#else
+			m_pose[0] = ovrHmd_GetEyePose(m_hmd, ovrEye_Left);
+			m_pose[1] = ovrHmd_GetEyePose(m_hmd, ovrEye_Right);
+#endif // OVR_VERSION > OVR_VERSION_042
 		}
 	}