Enable 90Hz mode for Oculus

Assets/Scripts/VrSdk.cs

@@ -192,6 +192,17 @@ void Awake()
       manager.useRecommendedMSAALevel = false;
 
       SetControllerStyle(TiltBrush.ControllerStyle.OculusTouch);
+
+      // Set 90Hz if possible. To see the current framerate, look in the logs for prints like this one. The first number is the frame rate, the second is the display refresh rate
+      // VrApi   : FPS=90/90,Prd=33ms,Tear=0,Early=0...
+      float[] freqs = OVRManager.display.displayFrequenciesAvailable;
+      Debug.Log($"Supported frequencies are: {freqs}");
+      if (Array.Exists(freqs, element => element == 90.0f))
+      {
+          OVRPlugin.systemDisplayFrequency = 90.0f;
+      }
+      OVRManager.DisplayRefreshRateChanged += DisplayRefreshRateChanged;
+
       // adding components to the VR Camera needed for fading view and getting controller poses.
       m_VrCamera.gameObject.AddComponent<OculusCameraFade>();
       m_VrCamera.gameObject.AddComponent<OculusPreCullHook>();
@@ -339,6 +350,13 @@ private void OnInputFocus(params object[] args)
             m_HasVrFocus = (bool)args[0];
         }
 
+#if OCULUS_SUPPORTED
+        private void DisplayRefreshRateChanged (float fromRefreshRate, float ToRefreshRate)
+        {
+            Debug.LogWarning(string.Format("Refresh rate changed from {0} to {1}", fromRefreshRate, ToRefreshRate));
+        }
+#endif
+
         private void OnNewPoses()
         {
             if (NewControllerPosesApplied != null)