Render a fullscreen quad using the current GL state. The only GL state this
modifies is the necessary vertex/index buffers and, if necessary, a
Vertex Array Object for drawing a fullscreen quad. Framebuffer state,
any shaders, viewport state, etc must be setup by the caller.
Render a fullscreen quad using the current GL state. The only GL state this modifies is the necessary vertex/index buffers and, if necessary, a Vertex Array Object for drawing a fullscreen quad. Framebuffer state, any shaders, viewport state, etc must be setup by the caller.