typedef float vec_t;typedef vec_t vec3_t[3];typedef vec_t vec5_t[5]; typedef int fixed4_t;typedef int fixed8_t;typedef int fixed16_t; #ifndef M_PI#define M_PI 3.14159265358979323846 // matches value in gcc v2 math.h#endif struct mplane_s; extern vec3_t vec3_origin;extern int nanmask; #define IS_NAN(x) (((*(int *)&x)&nanmask)==nanmask) #define DotProduct(x,y) (x[0]*y[0]+x[1]*y[1]+x[2]*y[2])#define VectorSubtract(a,b,c) {c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];}#define VectorAdd(a,b,c) {c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];}#define VectorCopy(a,b) {b[0]=a[0];b[1]=a[1];b[2]=a[2];} void VectorMA (vec3_t veca, float scale, vec3_t vecb, vec3_t vecc); vec_t _DotProduct (vec3_t v1, vec3_t v2);void _VectorSubtract (vec3_t veca, vec3_t vecb, vec3_t out);void _VectorAdd (vec3_t veca, vec3_t vecb, vec3_t out);void _VectorCopy (vec3_t in, vec3_t out); int VectorCompare (vec3_t v1, vec3_t v2);vec_t Length (vec3_t v);void CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross);float VectorNormalize (vec3_t v); // returns vector lengthvoid VectorInverse (vec3_t v);void VectorScale (vec3_t in, vec_t scale, vec3_t out);int Q_log2(int val); void R_ConcatRotations (float in1[3][3], float in2[3][3], float out[3][3]);void R_ConcatTransforms (float in1[3][4], float in2[3][4], float out[3][4]); void FloorDivMod (double numer, double denom, int *quotient,		int *rem);fixed16_t Invert24To16(fixed16_t val);int GreatestCommonDivisor (int i1, int i2); void AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up);int BoxOnPlaneSide (vec3_t emins, vec3_t emaxs, struct mplane_s *plane);float anglemod(float a); #define BOX_ON_PLANE_SIDE(emins, emaxs, p) \	(((p)->type < 3)? \	( \		((p)->dist <= (emins)[(p)->type])? \			1 \		: \		( \			((p)->dist >= (emaxs)[(p)->type])?\				2 \			: \				3 \		) \	) \	: \		BoxOnPlaneSide( (emins), (emaxs), (p)))