/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// mathlib.h

#ifndef _MATHLIB_H
#define _MATHLIB_H

//#include "model.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            3.14159265358979323846  // 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 length
void 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);
fixed16_t Mul16_30(fixed16_t multiplier, fixed16_t multiplicand);
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);

void RotatePointAroundVector( vec3_t dst, const vec3_t dir, const vec3_t point, float degrees );


#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)))

#endif // _MATHLIB_H