ref: 8178edf7dadc13301de98099b987eefffd3adca6
dir: /mathlib.h/
// 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 DotProduct (const vec3_t v1, const 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 length
void 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);
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)))