Sdlfb
From Agar
The sdlfb driver allows an Agar application to use the SDL library as a backend for graphics and input devices. Using sdlfb, Agar renders GUI elements directly to the SDL frame-buffer (unlike the sdlgl driver which also uses SDL as a backend, but instead renders GUI elements as OpenGL primitives).
sdlfb is a "single-window" driver, meaning that instead of interacting with an existing window system, Agar will provide its own, built-in window manager.
