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 = {CVAR_SAVE, "chase_back", "48"};
  25 cvar_t  chase_up = {CVAR_SAVE, "chase_up", "48"};
  26 cvar_t  chase_active = {CVAR_SAVE, "chase_active", "0"};
  27
  28 void Chase_Init (void)
  29 {
  30         Cvar_RegisterVariable (&chase_back);
  31         Cvar_RegisterVariable (&chase_up);
  32         Cvar_RegisterVariable (&chase_active);
  33 }
  34
  35 void Chase_Reset (void)
  36 {
  37         // for respawning and teleporting
  38 //      start position 12 units behind head
  39 }
  40
  41 int traceline_endcontents;
  42
  43 static entity_render_t *traceline_entity[MAX_EDICTS];
  44 static int traceline_entities;
  45
  46 // builds list of entities for TraceLine to check later
  47 void TraceLine_ScanForBModels(void)
  48 {
  49         int i;
  50         entity_render_t *ent;
  51         model_t *model;
  52         traceline_entities = 0;
  53         for (i = 1;i < MAX_EDICTS;i++)
  54         {
  55                 ent = &cl_entities[i].render;
  56                 model = ent->model;
  57                 // look for embedded brush models only
  58                 if (model && model->name[0] == '*')
  59                 {
  60                         // this does nothing for * models currently...
  61                         //Mod_CheckLoaded(model);
  62                         if (model->type == mod_brush)
  63                         {
  64                                 traceline_entity[traceline_entities++] = ent;
  65                                 if (ent->angles[0] || ent->angles[2])
  66                                 {
  67                                         // pitch or roll
  68                                         VectorAdd(ent->origin, model->rotatedmins, ent->mins);
  69                                         VectorAdd(ent->origin, model->rotatedmaxs, ent->maxs);
  70                                 }
  71                                 else if (ent->angles[1])
  72                                 {
  73                                         // yaw
  74                                         VectorAdd(ent->origin, model->yawmins, ent->mins);
  75                                         VectorAdd(ent->origin, model->yawmaxs, ent->maxs);
  76                                 }
  77                                 else
  78                                 {
  79                                         VectorAdd(ent->origin, model->normalmins, ent->mins);
  80                                         VectorAdd(ent->origin, model->normalmaxs, ent->maxs);
  81                                 }
  82                         }
  83                 }
  84         }
  85 }
  86
  87 float TraceLine (vec3_t start, vec3_t end, vec3_t impact, vec3_t normal, int contents, int hitbmodels)
  88 {
  89         float maxfrac;
  90         trace_t trace;
  91
  92 // FIXME: broken, fix it
  93 //      if (impact == NULL && normal == NULL && contents == 0)
  94 //              return SV_TestLine (cl.worldmodel->hulls, 0, start, end);
  95
  96         Mod_CheckLoaded(cl.worldmodel);
  97         memset (&trace, 0, sizeof(trace));
  98         VectorCopy (end, trace.endpos);
  99         trace.fraction = 1;
 100         trace.startcontents = contents;
 101         VectorCopy(start, RecursiveHullCheckInfo.start);
 102         VectorSubtract(end, start, RecursiveHullCheckInfo.dist);
 103         RecursiveHullCheckInfo.hull = cl.worldmodel->hulls;
 104         RecursiveHullCheckInfo.trace = &trace;
 105         SV_RecursiveHullCheck (0, 0, 1, start, end);
 106         if (impact)
 107                 VectorCopy (trace.endpos, impact);
 108         if (normal)
 109                 VectorCopy (trace.plane.normal, normal);
 110         traceline_endcontents = trace.endcontents;
 111         maxfrac = trace.fraction;
 112
 113         if (hitbmodels && traceline_entities)
 114         {
 115                 int n;
 116                 entity_render_t *ent;
 117                 vec3_t start2, end2, tracemins, tracemaxs;
 118                 tracemins[0] = min(start[0], end[0]);
 119                 tracemaxs[0] = max(start[0], end[0]);
 120                 tracemins[1] = min(start[1], end[1]);
 121                 tracemaxs[1] = max(start[1], end[1]);
 122                 tracemins[2] = min(start[2], end[2]);
 123                 tracemaxs[2] = max(start[2], end[2]);
 124
 125                 // look for embedded bmodels
 126                 for (n = 0;n < traceline_entities;n++)
 127                 {
 128                         ent = traceline_entity[n];
 129                         if (ent->mins[0] > tracemaxs[0] || ent->maxs[0] < tracemins[0]
 130                          || ent->mins[1] > tracemaxs[1] || ent->maxs[1] < tracemins[1]
 131                          || ent->mins[2] > tracemaxs[2] || ent->maxs[2] < tracemins[2])
 132                                 continue;
 133
 134                         softwaretransformforentity(ent);
 135                         softwareuntransform(start, start2);
 136                         softwareuntransform(end, end2);
 137
 138                         memset (&trace, 0, sizeof(trace));
 139                         VectorCopy (end2, trace.endpos);
 140                         trace.fraction = 1;
 141                         trace.startcontents = contents;
 142                         VectorCopy(start2, RecursiveHullCheckInfo.start);
 143                         VectorSubtract(end2, start2, RecursiveHullCheckInfo.dist);
 144                         RecursiveHullCheckInfo.hull = ent->model->hulls;
 145                         RecursiveHullCheckInfo.trace = &trace;
 146                         SV_RecursiveHullCheck (ent->model->hulls->firstclipnode, 0, 1, start2, end2);
 147
 148                         if (trace.allsolid || trace.startsolid || trace.fraction < maxfrac)
 149                         {
 150                                 maxfrac = trace.fraction;
 151                                 if (impact)
 152                                 {
 153                                         softwaretransform(trace.endpos, impact);
 154                                 }
 155                                 if (normal)
 156                                 {
 157                                         softwaretransformdirection(trace.plane.normal, normal);
 158                                 }
 159                                 traceline_endcontents = trace.endcontents;
 160                         }
 161                 }
 162         }
 163         return maxfrac;
 164 }
 165
 166 void Chase_Update (void)
 167 {
 168         vec3_t  forward, stop, chase_dest, normal;
 169         float   dist;
 170
 171         chase_back.value = bound(0, chase_back.value, 128);
 172         chase_up.value = bound(-48, chase_up.value, 96);
 173
 174         AngleVectors (cl.viewangles, forward, NULL, NULL);
 175
 176         dist = -chase_back.value - 8;
 177         chase_dest[0] = r_refdef.vieworg[0] + forward[0] * dist;
 178         chase_dest[1] = r_refdef.vieworg[1] + forward[1] * dist;
 179         chase_dest[2] = r_refdef.vieworg[2] + forward[2] * dist + chase_up.value;
 180
 181         TraceLine (r_refdef.vieworg, chase_dest, stop, normal, 0, true);
 182         chase_dest[0] = stop[0] + forward[0] * 8 + normal[0] * 4;
 183         chase_dest[1] = stop[1] + forward[1] * 8 + normal[1] * 4;
 184         chase_dest[2] = stop[2] + forward[2] * 8 + normal[2] * 4;
 185
 186         VectorCopy (chase_dest, r_refdef.vieworg);
 187 }
 188