// mathlib.h 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		3.14159265358979323846264338327950288#endif int isnanf(float f); struct mplane_s; extern vec3_t vec3_origin; #define Qrint(f) (int)((f) + ((f) >= 0 ? 0.5 : -0.5)) #define DotProduct_(x,y) (x[0]*y[0]+x[1]*y[1]+x[2]*y[2])#define DotProductDouble(x,y) ((double)x[0]*y[0]+(double)x[1]*y[1]+(double)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 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); 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);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); typedef struct clipplane_s{	vec3_t		normal;	float		dist;	struct		clipplane_s	*next;	byte		leftedge;	byte		rightedge;} clipplane_t; typedef struct {	vec3_t modelorg, org;	vec3_t pn, right, up;	vec3_t angles;	clipplane_t	clipplanes[4];}view_t; void TransformVector(vec3_t in, vec3_t out, view_t *v); #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)))