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 typedef float matrix_4x4[4][4]; // the standard 4x4 homogenous matrix 31 32 typedef float matrix_1x4[4]; // a 1x4 matrix or a row vector 33 34 #ifndef M_PI 35 #define M_PI 3.14159265358979323846 // matches value in gcc v2 math.h 36 #endif 37 38 struct mplane_s; 39 40 extern vec3_t vec3_origin; 41 extern int nanmask; 42 43 #define IS_NAN(x) (((*(int *)&x)&nanmask)==nanmask) 44 45 #define DotProduct(x,y) (x[0]*y[0]+x[1]*y[1]+x[2]*y[2]) 46 #define VectorSubtract(a,b,c) {c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];} 47 #define VectorAdd(a,b,c) {c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];} 48 #define VectorCopy(a,b) {b[0]=a[0];b[1]=a[1];b[2]=a[2];} 49 50 void VectorMA (vec3_t veca, float scale, vec3_t vecb, vec3_t vecc); 51 52 vec_t _DotProduct (vec3_t v1, vec3_t v2); 53 void _VectorSubtract (vec3_t veca, vec3_t vecb, vec3_t out); 54 void _VectorAdd (vec3_t veca, vec3_t vecb, vec3_t out); 55 void _VectorCopy (vec3_t in, vec3_t out); 56 57 int VectorCompare (vec3_t v1, vec3_t v2); 58 vec_t Length (vec3_t v); 59 void CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross); 60 float VectorNormalize (vec3_t v); // returns vector length 61 void VectorInverse (vec3_t v); 62 void VectorScale (vec3_t in, vec_t scale, vec3_t out); 63 int Q_log2(int val); 64 65 void R_ConcatRotations (float in1[3][3], float in2[3][3], float out[3][3]); 66 void R_ConcatTransforms (float in1[3][4], float in2[3][4], float out[3][4]); 67 68 void FloorDivMod (double numer, double denom, int *quotient, 69 int *rem); 70 fixed16_t Invert24To16(fixed16_t val); 71 int GreatestCommonDivisor (int i1, int i2); 72 73 void AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up); 74 int BoxOnPlaneSide (vec3_t emins, vec3_t emaxs, struct mplane_s *plane); 75 float anglemod(float a); 76 void MatrixAffineInverse (matrix_4x4 m, matrix_4x4 result); // <AWE> added prototype. 77 void Mat_Mul_1x4_4x4 (matrix_1x4 a, matrix_4x4 b,matrix_1x4 result); // <AWE> added prototype. 78 void RotatePointAroundVector (vec3_t dst, const vec3_t dir, const vec3_t point, float degrees); // <AWE> added prototype. 79 80 //XYZ added 81 #define RAD2DEG( a ) ( ( (a) * 180.0f ) / M_PI ) 82 #define DEG2RAD( a ) ( ( (a) * M_PI ) / 180.0F ) 83 84 #define BOX_ON_PLANE_SIDE(emins, emaxs, p) \ 85 (((p)->type < 3)? \ 86 ( \ 87 ((p)->dist <= (emins)[(p)->type])? \ 88 1 \ 89 : \ 90 ( \ 91 ((p)->dist >= (emaxs)[(p)->type])?\ 92 2 \ 93 : \ 94 3 \ 95 ) \ 96 ) \ 97 : \ 98 BoxOnPlaneSide( (emins), (emaxs), (p))) 99