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