1/*
2Copyright (C) 1996-1997 Id Software, Inc.
3
4This program is free software; you can redistribute it and/or
5modify it under the terms of the GNU General Public License
6as published by the Free Software Foundation; either version 2
7of the License, or (at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18
19*/
20// mathlib.h
21
22typedef float vec_t;
23typedef vec_t vec3_t[3];
24typedef vec_t vec5_t[5];
25
26typedef	int	fixed4_t;
27typedef	int	fixed8_t;
28typedef	int	fixed16_t;
29
30#ifndef M_PI
31#define M_PI		3.14159265358979323846	// matches value in gcc v2 math.h
32#endif
33
34struct mplane_s;
35
36extern vec3_t vec3_origin;
37extern	int nanmask;
38
39#define	IS_NAN(x) (((*(int *)&x)&nanmask)==nanmask)
40
41#define DotProduct(x,y) (x[0]*y[0]+x[1]*y[1]+x[2]*y[2])
42#define VectorSubtract(a,b,c) {c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];}
43#define VectorAdd(a,b,c) {c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];}
44#define VectorCopy(a,b) {b[0]=a[0];b[1]=a[1];b[2]=a[2];}
45
46void VectorMA (vec3_t veca, float scale, vec3_t vecb, vec3_t vecc);
47
48vec_t _DotProduct (vec3_t v1, vec3_t v2);
49void _VectorSubtract (vec3_t veca, vec3_t vecb, vec3_t out);
50void _VectorAdd (vec3_t veca, vec3_t vecb, vec3_t out);
51void _VectorCopy (vec3_t in, vec3_t out);
52
53int VectorCompare (vec3_t v1, vec3_t v2);
54vec_t Length (vec3_t v);
55void CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross);
56float VectorNormalize (vec3_t v);		// returns vector length
57void VectorInverse (vec3_t v);
58void VectorScale (vec3_t in, vec_t scale, vec3_t out);
59int Q_log2(int val);
60
61void R_ConcatRotations (float in1[3][3], float in2[3][3], float out[3][3]);
62void R_ConcatTransforms (float in1[3][4], float in2[3][4], float out[3][4]);
63
64void FloorDivMod (double numer, double denom, int *quotient,
65		int *rem);
66fixed16_t Invert24To16(fixed16_t val);
67fixed16_t Mul16_30(fixed16_t multiplier, fixed16_t multiplicand);
68int GreatestCommonDivisor (int i1, int i2);
69
70void AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up);
71int BoxOnPlaneSide (vec3_t emins, vec3_t emaxs, struct mplane_s *plane);
72float	anglemod(float a);
73
74void RotatePointAroundVector( vec3_t dst, const vec3_t dir, const vec3_t point, float degrees );
75
76
77#define BOX_ON_PLANE_SIDE(emins, emaxs, p)	\
78	(((p)->type < 3)?						\
79	(										\
80		((p)->dist <= (emins)[(p)->type])?	\
81			1								\
82		:									\
83		(									\
84			((p)->dist >= (emaxs)[(p)->type])?\
85				2							\
86			:								\
87				3							\
88		)									\
89	)										\
90	:										\
91		BoxOnPlaneSide( (emins), (emaxs), (p)))
92