chase.c

   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", true};
  25 cvar_t  chase_up = {"chase_up", "16", true};
  26 cvar_t  chase_right = {"chase_right", "0", true};
  27 cvar_t  chase_active = {"chase_active", "0", false};
  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] = -atanf(stop[2] / dist) / M_PI * 180;
  88
  89     TraceLine(r_refdef.vieworg, chase_dest, stop);
  90
  91     if (Length(stop) != 0)
  92     {
  93             VectorCopy(stop, chase_dest);
  94     }
  95
  96         // move towards destination
  97         VectorCopy (chase_dest, r_refdef.vieworg);
  98 }
  99