message: allow getting raw window from ggez. partially enables
diff: @@ -909,6 +909,11 @@ pub fn drawable_size(context: &Context) -> (f32, f32) {
  .unwrap_or((0.0, 0.0))
  }
  +/// Return raw window context
  +pub fn window_raw(context: &mut Context) -> &mut glutin::WindowedContext<glutin::PossiblyCurrent> {
  + &mut context.gfx_context.window
  +}
  +
  /// Returns raw `gfx-rs` state objects, if you want to use `gfx-rs` to write
  /// your own graphics pipeline then this gets you the interfaces you need
  /// to do so.
  