code: func (u *UserInterface) glfwSize() (int, int) {
  	w := int(float64(u.windowWidth) * u.getScale() * u.glfwScale())
  	h := int(float64(u.height) * u.getScale() * u.glfwScale())
  	return w, h
  }
docs: // getSize must be called from the main thread.