world.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 // world.c -- world query functions
  21
  22 #include "quakedef.h"
  23
  24 /*
  25
  26 entities never clip against themselves, or their owner
  27
  28 line of sight checks trace->inopen and trace->inwater, but bullets don't
  29
  30 */
  31
  32 cvar_t sv_useareanodes = {CVAR_NOTIFY, "sv_useareanodes", "1"};
  33 cvar_t sv_polygoncollisions = {CVAR_NOTIFY, "sv_polygoncollisions", "0"};
  34
  35 void SV_World_Init(void)
  36 {
  37         Cvar_RegisterVariable(&sv_useareanodes);
  38         Cvar_RegisterVariable(&sv_polygoncollisions);
  39         Collision_Init();
  40 }
  41
  42 typedef struct
  43 {
  44         // bounding box of entire move area
  45         vec3_t boxmins, boxmaxs;
  46
  47         // size of the moving object
  48         vec3_t mins, maxs;
  49
  50         // size when clipping against monsters
  51         vec3_t mins2, maxs2;
  52
  53         // size when clipping against brush models
  54         vec3_t hullmins, hullmaxs;
  55
  56         // start and end origin of move
  57         vec3_t start, end;
  58
  59         // trace results
  60         trace_t trace;
  61
  62         // type of move (like ignoring monsters, or similar)
  63         int type;
  64
  65         // the edict that is moving (if any)
  66         edict_t *passedict;
  67 }
  68 moveclip_t;
  69
  70 //#define EDICT_FROM_AREA(l) ((edict_t *)((qbyte *)l - (int)&(((edict_t *)0)->area)))
  71 #define EDICT_FROM_AREA(l) ((edict_t *)l->entity)
  72
  73 //============================================================================
  74
  75 // ClearLink is used for new headnodes
  76 void ClearLink (link_t *l)
  77 {
  78         l->entity = NULL;
  79         l->prev = l->next = l;
  80 }
  81
  82 void RemoveLink (link_t *l)
  83 {
  84         l->next->prev = l->prev;
  85         l->prev->next = l->next;
  86 }
  87
  88 void InsertLinkBefore (link_t *l, link_t *before, void *ent)
  89 {
  90         l->entity = ent;
  91         l->next = before;
  92         l->prev = before->prev;
  93         l->prev->next = l;
  94         l->next->prev = l;
  95 }
  96
  97 void InsertLinkAfter (link_t *l, link_t *after)
  98 {
  99         l->next = after->next;
 100         l->prev = after;
 101         l->prev->next = l;
 102         l->next->prev = l;
 103 }
 104
 105
 106 /*
 107 ===============================================================================
 108
 109 ENTITY AREA CHECKING
 110
 111 ===============================================================================
 112 */
 113
 114 typedef struct areanode_s
 115 {
 116         // -1 = leaf node
 117         int axis;
 118         float dist;
 119         struct areanode_s *children[2];
 120         link_t trigger_edicts;
 121         link_t solid_edicts;
 122 }
 123 areanode_t;
 124
 125 #define AREA_DEPTH 1
 126 #define AREA_NODES (1 << (AREA_DEPTH + 1))
 127
 128 static areanode_t sv_areanodes[AREA_NODES];
 129 static int sv_numareanodes;
 130
 131 /*
 132 ===============
 133 SV_CreateAreaNode
 134
 135 ===============
 136 */
 137 areanode_t *SV_CreateAreaNode (int depth, vec3_t mins, vec3_t maxs)
 138 {
 139         areanode_t *anode;
 140         vec3_t size, mins1, maxs1, mins2, maxs2;
 141
 142         anode = &sv_areanodes[sv_numareanodes];
 143         sv_numareanodes++;
 144
 145         ClearLink (&anode->trigger_edicts);
 146         ClearLink (&anode->solid_edicts);
 147
 148         if (depth == AREA_DEPTH)
 149         {
 150                 anode->axis = -1;
 151                 anode->children[0] = anode->children[1] = NULL;
 152                 return anode;
 153         }
 154
 155         VectorSubtract (maxs, mins, size);
 156         if (size[0] > size[1])
 157                 anode->axis = 0;
 158         else
 159                 anode->axis = 1;
 160
 161         anode->dist = 0.5 * (maxs[anode->axis] + mins[anode->axis]);
 162         VectorCopy (mins, mins1);
 163         VectorCopy (mins, mins2);
 164         VectorCopy (maxs, maxs1);
 165         VectorCopy (maxs, maxs2);
 166
 167         maxs1[anode->axis] = mins2[anode->axis] = anode->dist;
 168
 169         anode->children[0] = SV_CreateAreaNode (depth+1, mins2, maxs2);
 170         anode->children[1] = SV_CreateAreaNode (depth+1, mins1, maxs1);
 171
 172         return anode;
 173 }
 174
 175 typedef struct areagrid_s
 176 {
 177         link_t trigger_edicts;
 178         link_t solid_edicts;
 179 }
 180 areagrid_t;
 181
 182 #define AREA_GRID 16
 183 #define AREA_GRIDNODES (AREA_GRID * AREA_GRID)
 184
 185 static areagrid_t sv_areagrid[AREA_GRIDNODES];
 186 static vec3_t sv_areagridbias, sv_areagridscale;
 187
 188 void SV_CreateAreaGrid (vec3_t mins, vec3_t maxs)
 189 {
 190         int i;
 191         VectorNegate(mins, sv_areagridbias);
 192         sv_areagridscale[0] = AREA_GRID / (maxs[0] + sv_areagridbias[0]);
 193         sv_areagridscale[1] = AREA_GRID / (maxs[1] + sv_areagridbias[1]);
 194         sv_areagridscale[2] = AREA_GRID / (maxs[2] + sv_areagridbias[2]);
 195         for (i = 0;i < AREA_GRIDNODES;i++)
 196         {
 197                 ClearLink (&sv_areagrid[i].trigger_edicts);
 198                 ClearLink (&sv_areagrid[i].solid_edicts);
 199         }
 200 }
 201
 202 /*
 203 ===============
 204 SV_ClearWorld
 205
 206 ===============
 207 */
 208 void SV_ClearWorld (void)
 209 {
 210         memset(sv_areanodes, 0, sizeof(sv_areanodes));
 211         sv_numareanodes = 0;
 212         Mod_CheckLoaded(sv.worldmodel);
 213         SV_CreateAreaNode(0, sv.worldmodel->normalmins, sv.worldmodel->normalmaxs);
 214         SV_CreateAreaGrid(sv.worldmodel->normalmins, sv.worldmodel->normalmaxs);
 215 }
 216
 217
 218 /*
 219 ===============
 220 SV_UnlinkEdict
 221
 222 ===============
 223 */
 224 void SV_UnlinkEdict (edict_t *ent)
 225 {
 226         int i;
 227         for (i = 0;i < ENTITYGRIDAREAS;i++)
 228         {
 229                 if (ent->areagrid[i].prev)
 230                 {
 231                         RemoveLink (&ent->areagrid[i]);
 232                         ent->areagrid[i].prev = ent->areagrid[i].next = NULL;
 233                 }
 234         }
 235         if (ent->area.prev)
 236         {
 237                 RemoveLink (&ent->area);
 238                 ent->area.prev = ent->area.next = NULL;
 239         }
 240 }
 241
 242
 243 /*
 244 ====================
 245 SV_TouchAreaNodes
 246 ====================
 247 */
 248 void SV_TouchAreaNodes ( edict_t *ent, areanode_t *node )
 249 {
 250         link_t *l, *next;
 251         edict_t *touch;
 252         int old_self, old_other;
 253
 254 loc0:
 255 // touch linked edicts
 256         for (l = node->trigger_edicts.next ; l != &node->trigger_edicts ; l = next)
 257         {
 258                 next = l->next;
 259                 touch = EDICT_FROM_AREA(l);
 260                 if (touch == ent)
 261                         continue;
 262                 if (!touch->v->touch || touch->v->solid != SOLID_TRIGGER)
 263                         continue;
 264                 if (ent->v->absmin[0] > touch->v->absmax[0]
 265                  || ent->v->absmin[1] > touch->v->absmax[1]
 266                  || ent->v->absmin[2] > touch->v->absmax[2]
 267                  || ent->v->absmax[0] < touch->v->absmin[0]
 268                  || ent->v->absmax[1] < touch->v->absmin[1]
 269                  || ent->v->absmax[2] < touch->v->absmin[2])
 270                         continue;
 271                 old_self = pr_global_struct->self;
 272                 old_other = pr_global_struct->other;
 273
 274                 pr_global_struct->self = EDICT_TO_PROG(touch);
 275                 pr_global_struct->other = EDICT_TO_PROG(ent);
 276                 pr_global_struct->time = sv.time;
 277                 PR_ExecuteProgram (touch->v->touch, "");
 278
 279                 pr_global_struct->self = old_self;
 280                 pr_global_struct->other = old_other;
 281         }
 282
 283 // recurse down both sides
 284         if (node->axis == -1)
 285                 return;
 286
 287         if (ent->v->absmax[node->axis] > node->dist)
 288         {
 289                 if (ent->v->absmin[node->axis] < node->dist)
 290                         SV_TouchAreaNodes(ent, node->children[1]); // order reversed to reduce code
 291                 node = node->children[0];
 292                 goto loc0;
 293         }
 294         else
 295         {
 296                 if (ent->v->absmin[node->axis] < node->dist)
 297                 {
 298                         node = node->children[1];
 299                         goto loc0;
 300                 }
 301         }
 302 }
 303
 304 void SV_TouchAreaGrid(edict_t *ent, areanode_t *node)
 305 {
 306         link_t *l, *next;
 307         edict_t *touch;
 308         areagrid_t *grid;
 309         int old_self, old_other, igrid[3], igridmins[3], igridmaxs[3];
 310
 311         igridmins[0] = (int) ((ent->v->absmin[0] + sv_areagridbias[0]) * sv_areagridscale[0]);
 312         igridmins[1] = (int) ((ent->v->absmin[1] + sv_areagridbias[1]) * sv_areagridscale[1]);
 313         //igridmins[2] = (int) ((ent->v->absmin[2] + sv_areagridbias[2]) * sv_areagridscale[2]);
 314         igridmaxs[0] = (int) ((ent->v->absmax[0] + sv_areagridbias[0]) * sv_areagridscale[0]) + 1;
 315         igridmaxs[1] = (int) ((ent->v->absmax[1] + sv_areagridbias[1]) * sv_areagridscale[1]) + 1;
 316         //igridmaxs[2] = (int) ((ent->v->absmax[2] + sv_areagridbias[2]) * sv_areagridscale[2]) + 1;
 317         igridmins[0] = max(0, igridmins[0]);
 318         igridmins[1] = max(0, igridmins[1]);
 319         //igridmins[2] = max(0, igridmins[2]);
 320         igridmaxs[0] = min(AREA_GRID, igridmaxs[0]);
 321         igridmaxs[1] = min(AREA_GRID, igridmaxs[1]);
 322         //igridmaxs[2] = min(AREA_GRID, igridmaxs[2]);
 323
 324         for (igrid[1] = igridmins[1];igrid[1] < igridmaxs[1];igrid[1]++)
 325         {
 326                 grid = sv_areagrid + igrid[1] * AREA_GRID + igridmins[0];
 327                 for (igrid[0] = igridmins[0];igrid[0] < igridmaxs[0];igrid[0]++, grid++)
 328                 {
 329                         for (l = grid->trigger_edicts.next;l != &grid->trigger_edicts;l = next)
 330                         {
 331                                 next = l->next;
 332                                 touch = EDICT_FROM_AREA(l);
 333                                 if (touch == ent)
 334                                         continue;
 335                                 if (!touch->v->touch || touch->v->solid != SOLID_TRIGGER)
 336                                         continue;
 337                                 if (ent->v->absmin[0] > touch->v->absmax[0]
 338                                  || ent->v->absmin[1] > touch->v->absmax[1]
 339                                  || ent->v->absmin[2] > touch->v->absmax[2]
 340                                  || ent->v->absmax[0] < touch->v->absmin[0]
 341                                  || ent->v->absmax[1] < touch->v->absmin[1]
 342                                  || ent->v->absmax[2] < touch->v->absmin[2])
 343                                         continue;
 344                                 old_self = pr_global_struct->self;
 345                                 old_other = pr_global_struct->other;
 346
 347                                 pr_global_struct->self = EDICT_TO_PROG(touch);
 348                                 pr_global_struct->other = EDICT_TO_PROG(ent);
 349                                 pr_global_struct->time = sv.time;
 350                                 PR_ExecuteProgram (touch->v->touch, "");
 351
 352                                 pr_global_struct->self = old_self;
 353                                 pr_global_struct->other = old_other;
 354                         }
 355                 }
 356         }
 357 }
 358
 359 void SV_LinkEdict_AreaNode(edict_t *ent)
 360 {
 361         areanode_t *node;
 362         // find the first node that the ent's box crosses
 363         node = sv_areanodes;
 364         while (1)
 365         {
 366                 if (node->axis == -1)
 367                         break;
 368                 if (ent->v->absmin[node->axis] > node->dist)
 369                         node = node->children[0];
 370                 else if (ent->v->absmax[node->axis] < node->dist)
 371                         node = node->children[1];
 372                 else
 373                         break;          // crosses the node
 374         }
 375
 376         // link it in
 377
 378         if (ent->v->solid == SOLID_TRIGGER)
 379                 InsertLinkBefore (&ent->area, &node->trigger_edicts, ent);
 380         else
 381                 InsertLinkBefore (&ent->area, &node->solid_edicts, ent);
 382 }
 383
 384 int SV_LinkEdict_AreaGrid(edict_t *ent)
 385 {
 386         areagrid_t *grid;
 387         int igrid[3], igridmins[3], igridmaxs[3], gridnum;
 388
 389         igridmins[0] = (int) ((ent->v->absmin[0] + sv_areagridbias[0]) * sv_areagridscale[0]);
 390         igridmins[1] = (int) ((ent->v->absmin[1] + sv_areagridbias[1]) * sv_areagridscale[1]);
 391         //igridmins[2] = (int) ((ent->v->absmin[2] + sv_areagridbias[2]) * sv_areagridscale[2]);
 392         igridmaxs[0] = (int) ((ent->v->absmax[0] + sv_areagridbias[0]) * sv_areagridscale[0]) + 1;
 393         igridmaxs[1] = (int) ((ent->v->absmax[1] + sv_areagridbias[1]) * sv_areagridscale[1]) + 1;
 394         //igridmaxs[2] = (int) ((ent->v->absmax[2] + sv_areagridbias[2]) * sv_areagridscale[2]) + 1;
 395         if (igridmins[0] < 0 || igridmaxs[0] > AREA_GRID || igridmins[1] < 0 || igridmaxs[1] > AREA_GRID || ((igridmaxs[0] - igridmins[0]) * (igridmaxs[1] - igridmins[1])) > ENTITYGRIDAREAS)
 396                 return false;
 397
 398         gridnum = 0;
 399         for (igrid[1] = igridmins[1];igrid[1] < igridmaxs[1];igrid[1]++)
 400         {
 401                 grid = sv_areagrid + igrid[1] * AREA_GRID + igridmins[0];
 402                 for (igrid[0] = igridmins[0];igrid[0] < igridmaxs[0];igrid[0]++, grid++, gridnum++)
 403                 {
 404                         if (ent->v->solid == SOLID_TRIGGER)
 405                                 InsertLinkBefore (&ent->areagrid[gridnum], &grid->trigger_edicts, ent);
 406                         else
 407                                 InsertLinkBefore (&ent->areagrid[gridnum], &grid->solid_edicts, ent);
 408                 }
 409         }
 410         return true;
 411 }
 412
 413 /*
 414 ===============
 415 SV_LinkEdict
 416
 417 ===============
 418 */
 419 void SV_LinkEdict (edict_t *ent, qboolean touch_triggers)
 420 {
 421         model_t *model;
 422
 423         if (ent->area.prev || ent->areagrid[0].prev)
 424                 SV_UnlinkEdict (ent);   // unlink from old position
 425
 426         if (ent == sv.edicts)
 427                 return;         // don't add the world
 428
 429         if (ent->free)
 430                 return;
 431
 432 // set the abs box
 433
 434         if (ent->v->solid == SOLID_BSP)
 435         {
 436                 if (ent->v->modelindex < 0 || ent->v->modelindex > MAX_MODELS)
 437                         Host_Error("SOLID_BSP with invalid modelindex!\n");
 438                 model = sv.models[(int) ent->v->modelindex];
 439                 if (model != NULL)
 440                 {
 441                         if (model->type != mod_brush)
 442                                 Host_Error("SOLID_BSP with non-BSP model\n");
 443
 444                         if (ent->v->angles[0] || ent->v->angles[2] || ent->v->avelocity[0] || ent->v->avelocity[2])
 445                         {
 446                                 VectorAdd(ent->v->origin, model->rotatedmins, ent->v->absmin);
 447                                 VectorAdd(ent->v->origin, model->rotatedmaxs, ent->v->absmax);
 448                         }
 449                         else if (ent->v->angles[1] || ent->v->avelocity[1])
 450                         {
 451                                 VectorAdd(ent->v->origin, model->yawmins, ent->v->absmin);
 452                                 VectorAdd(ent->v->origin, model->yawmaxs, ent->v->absmax);
 453                         }
 454                         else
 455                         {
 456                                 VectorAdd(ent->v->origin, model->normalmins, ent->v->absmin);
 457                                 VectorAdd(ent->v->origin, model->normalmaxs, ent->v->absmax);
 458                         }
 459                 }
 460                 else
 461                 {
 462                         // SOLID_BSP with no model is valid, mainly because some QC setup code does so temporarily
 463                         VectorAdd(ent->v->origin, ent->v->mins, ent->v->absmin);
 464                         VectorAdd(ent->v->origin, ent->v->maxs, ent->v->absmax);
 465                 }
 466         }
 467         else
 468         {
 469                 VectorAdd(ent->v->origin, ent->v->mins, ent->v->absmin);
 470                 VectorAdd(ent->v->origin, ent->v->maxs, ent->v->absmax);
 471         }
 472
 473 //
 474 // to make items easier to pick up and allow them to be grabbed off
 475 // of shelves, the abs sizes are expanded
 476 //
 477         if ((int)ent->v->flags & FL_ITEM)
 478         {
 479                 ent->v->absmin[0] -= 15;
 480                 ent->v->absmin[1] -= 15;
 481                 ent->v->absmin[2] -= 1;
 482                 ent->v->absmax[0] += 15;
 483                 ent->v->absmax[1] += 15;
 484                 ent->v->absmax[2] += 1;
 485         }
 486         else
 487         {
 488                 // because movement is clipped an epsilon away from an actual edge,
 489                 // we must fully check even when bounding boxes don't quite touch
 490                 ent->v->absmin[0] -= 1;
 491                 ent->v->absmin[1] -= 1;
 492                 ent->v->absmin[2] -= 1;
 493                 ent->v->absmax[0] += 1;
 494                 ent->v->absmax[1] += 1;
 495                 ent->v->absmax[2] += 1;
 496         }
 497
 498         if (ent->v->solid == SOLID_NOT)
 499                 return;
 500
 501         // try to link into areagrid, if that fails fall back on areanode
 502         if (!SV_LinkEdict_AreaGrid(ent))
 503                 SV_LinkEdict_AreaNode(ent);
 504
 505 // if touch_triggers, touch all entities at this node and descend for more
 506         if (touch_triggers)
 507         {
 508                 SV_TouchAreaNodes(ent, sv_areanodes);
 509                 SV_TouchAreaGrid(ent, sv_areanodes);
 510         }
 511 }
 512
 513
 514
 515 /*
 516 ===============================================================================
 517
 518 POINT TESTING IN HULLS
 519
 520 ===============================================================================
 521 */
 522
 523 /*
 524 ============
 525 SV_TestEntityPosition
 526
 527 This could be a lot more efficient...
 528 ============
 529 */
 530 int SV_TestEntityPosition (edict_t *ent)
 531 {
 532         return SV_Move (ent->v->origin, ent->v->mins, ent->v->maxs, ent->v->origin, MOVE_NORMAL, ent).startsolid;
 533 }
 534
 535
 536 /*
 537 ===============================================================================
 538
 539 LINE TESTING IN HULLS
 540
 541 ===============================================================================
 542 */
 543
 544 /*
 545 ==================
 546 SV_ClipMoveToEntity
 547
 548 Handles selection or creation of a clipping hull, and offseting (and
 549 eventually rotation) of the end points
 550 ==================
 551 */
 552 trace_t SV_ClipMoveToEntity (edict_t *ent, vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end)
 553 {
 554         int i;
 555         trace_t trace;
 556         model_t *model;
 557
 558         i = ent->v->modelindex;
 559         if ((unsigned int) i >= MAX_MODELS)
 560                 Host_Error("SV_ClipMoveToEntity: invalid modelindex\n");
 561         model = sv.models[i];
 562         if (i != 0 && model == NULL)
 563                 Host_Error("SV_ClipMoveToEntity: invalid modelindex\n");
 564
 565         if ((int) ent->v->solid == SOLID_BSP)
 566         {
 567                 Mod_CheckLoaded(model);
 568                 if (model->type != mod_brush)
 569                 {
 570                         Con_Printf ("SV_ClipMoveToEntity: SOLID_BSP with a non bsp model, entity dump:\n");
 571                         ED_Print (ent);
 572                         Host_Error ("SV_ClipMoveToEntity: SOLID_BSP with a non bsp model\n");
 573                 }
 574                 if (ent->v->movetype != MOVETYPE_PUSH)
 575                         Host_Error ("SV_ClipMoveToEntity: SOLID_BSP without MOVETYPE_PUSH");
 576         }
 577
 578         if (sv_polygoncollisions.integer && (mins[0] != maxs[0] || mins[1] != maxs[1] || mins[2] != maxs[2]))
 579                 Collision_PolygonClipTrace(&trace, ent, model, ent->v->origin, ent->v->angles, ent->v->mins, ent->v->maxs, start, mins, maxs, end);
 580         else
 581                 Collision_ClipTrace(&trace, ent, model, ent->v->origin, ent->v->angles, ent->v->mins, ent->v->maxs, start, mins, maxs, end);
 582
 583         return trace;
 584 }
 585
 586 //===========================================================================
 587
 588 /*
 589 ====================
 590 SV_ClipToAreaNodes
 591
 592 Mins and maxs enclose the entire area swept by the move
 593 ====================
 594 */
 595 void SV_ClipToAreaNodes ( areanode_t *node, moveclip_t *clip )
 596 {
 597         link_t *l, *next;
 598         edict_t *touch;
 599         trace_t trace;
 600
 601 loc0:
 602         if (clip->trace.allsolid)
 603                 return;
 604 // touch linked edicts
 605         for (l = node->solid_edicts.next ; l != &node->solid_edicts ; l = next)
 606         {
 607                 next = l->next;
 608                 touch = EDICT_FROM_AREA(l);
 609                 if (touch->v->solid == SOLID_NOT)
 610                         continue;
 611                 if (touch == clip->passedict)
 612                         continue;
 613                 if (touch->v->solid == SOLID_TRIGGER)
 614                 {
 615                         ED_Print(touch);
 616                         Host_Error ("Trigger in clipping list");
 617                 }
 618
 619                 if (clip->type == MOVE_NOMONSTERS && touch->v->solid != SOLID_BSP)
 620                         continue;
 621
 622                 if (clip->boxmins[0] > touch->v->absmax[0]
 623                  || clip->boxmaxs[0] < touch->v->absmin[0]
 624                  || clip->boxmins[1] > touch->v->absmax[1]
 625                  || clip->boxmaxs[1] < touch->v->absmin[1]
 626                  || clip->boxmins[2] > touch->v->absmax[2]
 627                  || clip->boxmaxs[2] < touch->v->absmin[2])
 628                         continue;
 629
 630                 if (clip->passedict)
 631                 {
 632                         if (clip->passedict->v->size[0] && !touch->v->size[0])
 633                                 continue;       // points never interact
 634                         if (PROG_TO_EDICT(touch->v->owner) == clip->passedict)
 635                                 continue;       // don't clip against own missiles
 636                         if (PROG_TO_EDICT(clip->passedict->v->owner) == touch)
 637                                 continue;       // don't clip against owner
 638                         // LordHavoc: corpse code
 639                         if (clip->passedict->v->solid == SOLID_CORPSE && (touch->v->solid == SOLID_SLIDEBOX || touch->v->solid == SOLID_CORPSE))
 640                                 continue;
 641                         if (clip->passedict->v->solid == SOLID_SLIDEBOX && touch->v->solid == SOLID_CORPSE)
 642                                 continue;
 643                 }
 644
 645                 // might interact, so do an exact clip
 646                 if (touch->v->solid == SOLID_BSP)
 647                         trace = SV_ClipMoveToEntity (touch, clip->start, clip->hullmins, clip->hullmaxs, clip->end);
 648                 else if ((int)touch->v->flags & FL_MONSTER)
 649                         trace = SV_ClipMoveToEntity (touch, clip->start, clip->mins2, clip->maxs2, clip->end);
 650                 else
 651                         trace = SV_ClipMoveToEntity (touch, clip->start, clip->mins, clip->maxs, clip->end);
 652                 // LordHavoc: take the 'best' answers from the new trace and combine with existing data
 653                 if (trace.allsolid)
 654                         clip->trace.allsolid = true;
 655                 if (trace.startsolid)
 656                 {
 657                         clip->trace.startsolid = true;
 658                         if (!clip->trace.ent)
 659                                 clip->trace.ent = trace.ent;
 660                 }
 661                 if (trace.inopen)
 662                         clip->trace.inopen = true;
 663                 if (trace.inwater)
 664                         clip->trace.inwater = true;
 665                 if (trace.fraction < clip->trace.fraction)
 666                 {
 667                         clip->trace.fraction = trace.fraction;
 668                         VectorCopy(trace.endpos, clip->trace.endpos);
 669                         clip->trace.plane = trace.plane;
 670                         clip->trace.endcontents = trace.endcontents;
 671                         clip->trace.ent = trace.ent;
 672                 }
 673         }
 674
 675 // recurse down both sides
 676         if (node->axis == -1)
 677                 return;
 678
 679         if (clip->boxmaxs[node->axis] > node->dist)
 680         {
 681                 if (clip->boxmins[node->axis] < node->dist)
 682                         SV_ClipToAreaNodes(node->children[1], clip);
 683                 node = node->children[0];
 684                 goto loc0;
 685         }
 686         else if (clip->boxmins[node->axis] < node->dist)
 687         {
 688                 node = node->children[1];
 689                 goto loc0;
 690         }
 691 }
 692
 693 /*
 694 ====================
 695 SV_ClipToAreaGrid
 696
 697 Mins and maxs enclose the entire area swept by the move
 698 ====================
 699 */
 700 void SV_ClipToAreaGrid(moveclip_t *clip)
 701 {
 702         link_t *l, *next;
 703         edict_t *touch;
 704         areagrid_t *grid;
 705         int igrid[3], igridmins[3], igridmaxs[3];
 706         trace_t trace;
 707
 708         if (clip->trace.allsolid)
 709                 return;
 710
 711         igridmins[0] = (int) ((clip->boxmins[0] + sv_areagridbias[0]) * sv_areagridscale[0]);
 712         igridmins[1] = (int) ((clip->boxmins[1] + sv_areagridbias[1]) * sv_areagridscale[1]);
 713         //igridmins[2] = (int) ((clip->boxmins[2] + sv_areagridbias[2]) * sv_areagridscale[2]);
 714         igridmaxs[0] = (int) ((clip->boxmaxs[0] + sv_areagridbias[0]) * sv_areagridscale[0]) + 1;
 715         igridmaxs[1] = (int) ((clip->boxmaxs[1] + sv_areagridbias[1]) * sv_areagridscale[1]) + 1;
 716         //igridmaxs[2] = (int) ((clip->boxmaxs[2] + sv_areagridbias[2]) * sv_areagridscale[2]) + 1;
 717         igridmins[0] = max(0, igridmins[0]);
 718         igridmins[1] = max(0, igridmins[1]);
 719         //igridmins[2] = max(0, igridmins[2]);
 720         igridmaxs[0] = min(AREA_GRID, igridmaxs[0]);
 721         igridmaxs[1] = min(AREA_GRID, igridmaxs[1]);
 722         //igridmaxs[2] = min(AREA_GRID, igridmaxs[2]);
 723
 724         for (igrid[1] = igridmins[1];igrid[1] < igridmaxs[1];igrid[1]++)
 725         {
 726                 grid = sv_areagrid + igrid[1] * AREA_GRID + igridmins[0];
 727                 for (igrid[0] = igridmins[0];igrid[0] < igridmaxs[0];igrid[0]++, grid++)
 728                 {
 729                         for (l = grid->solid_edicts.next;l != &grid->solid_edicts;l = next)
 730                         {
 731                                 next = l->next;
 732                                 touch = EDICT_FROM_AREA(l);
 733                                 if (touch->v->solid == SOLID_NOT)
 734                                         continue;
 735                                 if (touch == clip->passedict)
 736                                         continue;
 737                                 if (touch->v->solid == SOLID_TRIGGER)
 738                                 {
 739                                         ED_Print(touch);
 740                                         Host_Error ("Trigger in clipping list");
 741                                 }
 742
 743                                 if (clip->type == MOVE_NOMONSTERS && touch->v->solid != SOLID_BSP)
 744                                         continue;
 745
 746                                 if (clip->boxmins[0] > touch->v->absmax[0]
 747                                  || clip->boxmaxs[0] < touch->v->absmin[0]
 748                                  || clip->boxmins[1] > touch->v->absmax[1]
 749                                  || clip->boxmaxs[1] < touch->v->absmin[1]
 750                                  || clip->boxmins[2] > touch->v->absmax[2]
 751                                  || clip->boxmaxs[2] < touch->v->absmin[2])
 752                                         continue;
 753
 754                                 if (clip->passedict)
 755                                 {
 756                                         if (clip->passedict->v->size[0] && !touch->v->size[0])
 757                                                 continue;       // points never interact
 758                                         if (PROG_TO_EDICT(touch->v->owner) == clip->passedict)
 759                                                 continue;       // don't clip against own missiles
 760                                         if (PROG_TO_EDICT(clip->passedict->v->owner) == touch)
 761                                                 continue;       // don't clip against owner
 762                                         // LordHavoc: corpse code
 763                                         if (clip->passedict->v->solid == SOLID_CORPSE && (touch->v->solid == SOLID_SLIDEBOX || touch->v->solid == SOLID_CORPSE))
 764                                                 continue;
 765                                         if (clip->passedict->v->solid == SOLID_SLIDEBOX && touch->v->solid == SOLID_CORPSE)
 766                                                 continue;
 767                                 }
 768
 769                                 // might interact, so do an exact clip
 770                                 if (touch->v->solid == SOLID_BSP)
 771                                         trace = SV_ClipMoveToEntity (touch, clip->start, clip->hullmins, clip->hullmaxs, clip->end);
 772                                 else if ((int)touch->v->flags & FL_MONSTER)
 773                                         trace = SV_ClipMoveToEntity (touch, clip->start, clip->mins2, clip->maxs2, clip->end);
 774                                 else
 775                                         trace = SV_ClipMoveToEntity (touch, clip->start, clip->mins, clip->maxs, clip->end);
 776                                 // LordHavoc: take the 'best' answers from the new trace and combine with existing data
 777                                 if (trace.allsolid)
 778                                         clip->trace.allsolid = true;
 779                                 if (trace.startsolid)
 780                                 {
 781                                         clip->trace.startsolid = true;
 782                                         if (!clip->trace.ent)
 783                                                 clip->trace.ent = trace.ent;
 784                                 }
 785                                 if (trace.inopen)
 786                                         clip->trace.inopen = true;
 787                                 if (trace.inwater)
 788                                         clip->trace.inwater = true;
 789                                 if (trace.fraction < clip->trace.fraction)
 790                                 {
 791                                         clip->trace.fraction = trace.fraction;
 792                                         VectorCopy(trace.endpos, clip->trace.endpos);
 793                                         clip->trace.plane = trace.plane;
 794                                         clip->trace.endcontents = trace.endcontents;
 795                                         clip->trace.ent = trace.ent;
 796                                 }
 797                                 if (clip->trace.allsolid)
 798                                         return;
 799                         }
 800                 }
 801         }
 802 }
 803
 804
 805 /*
 806 ==================
 807 SV_MoveBounds
 808 ==================
 809 */
 810 void SV_MoveBounds (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, vec3_t boxmins, vec3_t boxmaxs)
 811 {
 812         if (sv_useareanodes.integer)
 813         {
 814                 int i;
 815
 816                 for (i=0 ; i<3 ; i++)
 817                 {
 818                         if (end[i] > start[i])
 819                         {
 820                                 boxmins[i] = start[i] + mins[i] - 1;
 821                                 boxmaxs[i] = end[i] + maxs[i] + 1;
 822                         }
 823                         else
 824                         {
 825                                 boxmins[i] = end[i] + mins[i] - 1;
 826                                 boxmaxs[i] = start[i] + maxs[i] + 1;
 827                         }
 828                 }
 829         }
 830         else
 831         {
 832                 // debug to test against everything
 833                 boxmins[0] = boxmins[1] = boxmins[2] = -999999999;
 834                 boxmaxs[0] = boxmaxs[1] = boxmaxs[2] =  999999999;
 835         }
 836 }
 837
 838 /*
 839 ==================
 840 SV_Move
 841 ==================
 842 */
 843 trace_t SV_Move (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, int type, edict_t *passedict)
 844 {
 845         moveclip_t      clip;
 846         vec3_t          bigmins, bigmaxs;
 847         int                     i;
 848
 849         memset ( &clip, 0, sizeof ( moveclip_t ) );
 850
 851         VectorCopy(start, clip.start);
 852         VectorCopy(end, clip.end);
 853         VectorCopy(mins, clip.mins);
 854         VectorCopy(maxs, clip.maxs);
 855         clip.type = type;
 856         clip.passedict = passedict;
 857
 858         Collision_RoundUpToHullSize(sv.worldmodel, clip.mins, clip.maxs, clip.hullmins, clip.hullmaxs);
 859
 860         if (type == MOVE_MISSILE)
 861         {
 862                 // LordHavoc: modified this, was = -15, now = clip.mins[i] - 15
 863                 for (i=0 ; i<3 ; i++)
 864                 {
 865                         clip.mins2[i] = clip.mins[i] - 15;
 866                         clip.maxs2[i] = clip.maxs[i] + 15;
 867                 }
 868         }
 869         else
 870         {
 871                 VectorCopy (clip.mins, clip.mins2);
 872                 VectorCopy (clip.maxs, clip.maxs2);
 873         }
 874
 875         bigmins[0] = min(clip.mins2[0], clip.hullmins[0]);
 876         bigmaxs[0] = max(clip.maxs2[0], clip.hullmaxs[0]);
 877         bigmins[1] = min(clip.mins2[1], clip.hullmins[1]);
 878         bigmaxs[1] = max(clip.maxs2[1], clip.hullmaxs[1]);
 879         bigmins[2] = min(clip.mins2[2], clip.hullmins[2]);
 880         bigmaxs[2] = max(clip.maxs2[2], clip.hullmaxs[2]);
 881
 882         // clip to world
 883         clip.trace = SV_ClipMoveToEntity (sv.edicts, start, mins, maxs, end);
 884
 885         // clip to entities
 886         // create the bounding box of the entire move
 887         SV_MoveBounds ( start, bigmins, bigmaxs, end, clip.boxmins, clip.boxmaxs );
 888
 889         SV_ClipToAreaNodes(sv_areanodes, &clip);
 890         SV_ClipToAreaGrid(&clip);
 891
 892         return clip.trace;
 893 }
 894