review vr stuff, fix controller-ui ray casting

src/app_events.cpp

@@ -31,7 +31,7 @@ void App::tick(float dt)
 void App::resize(float w, float h)
 {
     LOG("App::resize %d %d", (int)w, (int)h);
-    uirtt.create(w, h);
+    uirtt.create(w, h, -1, GL_RGBA8, true);
     redraw = true;
     width = w;
     height = h;