/*
 * Prototypes:
 *	setup_gfx(): sets up graphics, etc. (provided)
 *	draw_scene(): renders the scene (you'll write this function)
 *	canvas_expose(): callback; basically just calls draw_scene()
 */
extern void setup_gfx(int w, int h);
extern void draw_scene(void);
extern int canvas_expose(FL_OBJECT *, Window, int, int, XEvent *, void *);