#pragma once typedef float vec_t;typedef vec_t vec3_t[3];typedef vec_t vec5_t[5]; typedef s16int fixed8_t;typedef s32int fixed16_t; #ifndef M_PI#define M_PI 3.14159265358979323846264338327950288#endif 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) \	do { \		c[0] = a[0] - b[0]; \		c[1] = a[1] - b[1]; \		c[2] = a[2] - b[2]; \	} while(0)#define VectorAdd(a, b, c) \	do { \		c[0] = a[0] + b[0]; \		c[1] = a[1] + b[1]; \		c[2] = a[2] + b[2]; \	} while(0)#define VectorCopy(a, b) \	do { \		b[0] = a[0]; \		b[1] = a[1]; \		b[2] = a[2]; \	} while(0) 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(const 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 {	float dist;	vec3_t normal;	byte leftedge;	byte rightedge;	struct clipplane_s *next;} 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)))