Don't show window if not ready to render

src/programs/viewer.rs

@@ -58,13 +58,13 @@ fn main() {
     }
 
     let mut events_loop = EventsLoop::new();
-    let window = WindowBuilder::new();
+    let window = WindowBuilder::new().with_visibility(false);
     let context = glutin::ContextBuilder::new().with_depth_buffer(24);
     let display = Display::new(window, context, &events_loop).unwrap();
+    let mut renderer = Renderer::new(display);
 
     let mut closed = false;
 
-    let mut renderer = Renderer::new(display);
     renderer.add_model(&model);
 
     let mut camera = Camera::new(
@@ -75,6 +75,8 @@ fn main() {
 
     let mut controls = OrbitControls::around(&model, &mut camera);
 
+    renderer.show();
+
     while !closed {
 
         events_loop.poll_events(|ev| {