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  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. // chase.c -- chase camera code
  21.  
  22. #include "quakedef.h"
  23.  
  24. cvar_t  chase_back = {"chase_back", "100"};
  25. cvar_t  chase_up = {"chase_up", "16"};
  26. cvar_t  chase_right = {"chase_right", "0"};
  27. cvar_t  chase_active = {"chase_active", "0"};
  28.  
  29. vec3_t  chase_pos;
  30. vec3_t  chase_angles;
  31.  
  32. vec3_t  chase_dest;
  33. vec3_t  chase_dest_angles;
  34.  
  35.  
  36. void Chase_Init (void)
  37. {
  38.         Cvar_RegisterVariable (&chase_back);
  39.         Cvar_RegisterVariable (&chase_up);
  40.         Cvar_RegisterVariable (&chase_right);
  41.         Cvar_RegisterVariable (&chase_active);
  42. }
  43.  
  44. void Chase_Reset (void)
  45. {
  46.         // for respawning and teleporting
  47. //      start position 12 units behind head
  48. }
  49.  
  50. void TraceLine (vec3_t start, vec3_t end, vec3_t impact)
  51. {
  52.         trace_t trace;
  53.  
  54.         memset (&trace, 0, sizeof(trace));
  55.         SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, start, end, &trace);
  56.  
  57.         VectorCopy (trace.endpos, impact);
  58. }
  59.  
  60. void Chase_Update (void)
  61. {
  62.         int             i;
  63.         float   dist;
  64.         vec3_t  forward, up, right;
  65.         vec3_t  dest, stop;
  66.  
  67.  
  68.         // if can't see player, reset
  69.         AngleVectors (cl.viewangles, forward, right, up);
  70.  
  71.         // calc exact destination
  72.         for (i=0 ; i<3 ; i++)
  73.                 chase_dest[i] = r_refdef.vieworg[i]
  74.                 - forward[i]*chase_back.value
  75.                 - right[i]*chase_right.value;
  76.         chase_dest[2] = r_refdef.vieworg[2] + chase_up.value;
  77.  
  78.         // find the spot the player is looking at
  79.         VectorMA (r_refdef.vieworg, 4096, forward, dest);
  80.         TraceLine (r_refdef.vieworg, dest, stop);
  81.  
  82.         // calculate pitch to look at the same spot from camera
  83.         VectorSubtract (stop, r_refdef.vieworg, stop);
  84.         dist = DotProduct (stop, forward);
  85.         if (dist < 1)
  86.                 dist = 1;
  87.         r_refdef.viewangles[PITCH] = -atan(stop[2] / dist) / M_PI * 180;
  88.  
  89.         // move towards destination
  90.         VectorCopy (chase_dest, r_refdef.vieworg);
  91. }
  92.  
  93.