quakeforge-old/common/mathlib.h

/*
Copyright (C) 1996-1997  Id Software, Inc.
Copyright (C) 1999,2000  contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors

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 <stdio.h>
#include <math.h>


#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	RotatePointAroundVector( vec3_t dst, const vec3_t dir, const vec3_t point, float degrees );
float	anglemod(float a);
void	BOPS_Error (void);
int		BoxOnPlaneSide (vec3_t emins, vec3_t emaxs, struct mplane_s *plane);
void	AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up);
int		VectorCompare (vec3_t v1, vec3_t v2);
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);
void	CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross);
vec_t	Length (vec3_t v);
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);
int		GreatestCommonDivisor (int i1, int i2);
fixed16_t Invert24To16(fixed16_t val);

#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