(gl:bind-framebuffer :framebuffer fbo)
(gl:bind-renderbuffer :renderbuffer render-buf)
(gl:renderbuffer-storage :renderbuffer :rgba8 width height)
(gl:bind-framebuffer :framebuffer fbo)
(gl:bind-renderbuffer :renderbuffer render-buf)
(gl:renderbuffer-storage :renderbuffer :rgba8 width height)