extern void DrawStuff (void);
extern void InitStuff (void);

/* most recent mouse position */
extern float lastx;
extern float lasty;

#ifndef NULL
#define NULL ((void *) 0x0)
#endif /* NULL */

/* Some <math.h> files do not define M_PI... */
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif