/*  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.
*/

#ifndef __MATHLIB__
#define __MATHLIB__

// 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 //0.004

qboolean VectorCompare( vec3_t v1, vec3_t v2 );
qboolean VectorCompareEpsilon( vec3_t v1, vec3_t v2, double epsilon );

#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 ]; }
#if 1 // Rotating brush support
  #define VectorNegate( a, b ) (( b )[ 0 ] = -( a )[ 0 ], ( b )[ 1 ] = -( a )[ 1 ], ( b )[ 2 ] = -( a )[ 2 ] )
#endif
#define VectorCross( a, b, c )\
	c[ 0 ] = a[ 1 ] * b[ 2 ] - a[ 2 ] * b[ 1 ];\
	c[ 1 ] = a[ 2 ] * b[ 0 ] - a[ 0 ] * b[ 2 ];\
	c[ 2 ] = a[ 0 ] * b[ 1 ] - a[ 1 ] * b[ 0 ];

#define MAX( a, b ) (( a > b ) ? ( a ) : ( b ))
#define MIN( a, b ) (( a < b ) ? ( a ) : ( b ))

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 );
#if 1 // Rotating brush support
vec_t RadiusFromBounds( vec3_t mins, vec3_t maxs );
#endif

#endif
