Games/Quake/mathlib.h

   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 int GreatestCommonDivisor (int i1, int i2);
  68
  69 void AngleVectors (vec3_t angles, vec3_t forward, vec3_t right, vec3_t up);
  70 int BoxOnPlaneSide (vec3_t emins, vec3_t emaxs, struct mplane_s *plane);
  71 float   anglemod(float a);
  72
  73
  74
  75 #define BOX_ON_PLANE_SIDE(emins, emaxs, p)      \
  76         (((p)->type < 3)?                                               \
  77         (                                                                               \
  78                 ((p)->dist <= (emins)[(p)->type])?      \
  79                         1                                                               \
  80                 :                                                                       \
  81                 (                                                                       \
  82                         ((p)->dist >= (emaxs)[(p)->type])?\
  83                                 2                                                       \
  84                         :                                                               \
  85                                 3                                                       \
  86                 )                                                                       \
  87         )                                                                               \
  88         :                                                                               \
  89                 BoxOnPlaneSide( (emins), (emaxs), (p)))