gtk:gl-area-queue-render (area)

area -- a gtk:gl-area object

Marks the currently rendered data (if any) as invalid, and queues a redraw of the widget, ensuring that the "render" signal is emitted during the draw. This is only needed when the gtk:gl-area-auto-render function has been called with a false value. The default behaviour is to emit the "render" signal on each draw.