#include <libps.h>

#define Sgn(a) ( ((a) == 0) ? (0) : ((a)>0)*2-1 )
#define SetRGB0(c, _r, _g, _b) \
	(c)->r0 = (_r), \
	(c)->g0 = (_g), \
	(c)->b0 = (_b)
#define SetRGB1(c, _r, _g, _b) \
	(c)->r1 = (_r), \
	(c)->g1 = (_g), \
	(c)->b1 = (_b)

typedef struct {
	long sx, sy, ex, ey;
} Line;

int LineCollision(Line a, Line b);