mathlib.h

/*  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

    See file, 'COPYING', for details.
*/

/*
 * common/mathlib.h
 * Modifications by Kevin Shanahan
 */

#ifndef __COMMON_MATHLIB_H__
#define __COMMON_MATHLIB_H__

#include <math.h>

#ifdef DOUBLEVEC_T
typedef double vec_t;
#else
typedef float vec_t;
#endif
typedef vec_t vec3_t[3];

#define SIDE_FRONT  0
#define SIDE_ON     2
#define SIDE_BACK   1
#define SIDE_CROSS -2

#define Q_PI 3.14159265358979323846

extern vec3_t vec3_origin;

#define EQUAL_EPSILON 0.001

qboolean VectorCompare (vec3_t v1, vec3_t v2);

#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];}

vec_t Q_rint (vec_t in);
vec_t _DotProduct (vec3_t v1, vec3_t v2);
void  _VectorSubtract (vec3_t va, vec3_t vb, vec3_t out);
void  _VectorAdd (vec3_t va, vec3_t vb, vec3_t out);
void  _VectorCopy (vec3_t in, vec3_t out);

double VectorLength(vec3_t v);

void VectorMA (vec3_t va, double scale, vec3_t vb, vec3_t vc);

void  CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross);
vec_t VectorNormalize (vec3_t v);
void  VectorInverse (vec3_t v);
void  VectorScale (vec3_t v, vec_t scale, vec3_t out);

#endif /* __COMMON_MATHLIB_H__ */