sv_phys.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 // sv_phys.c
  21
  22 #include "quakedef.h"
  23
  24 /*
  25
  26
  27 pushmove objects do not obey gravity, and do not interact with each other or trigger fields, but block normal movement and push normal objects when they move.
  28
  29 onground is set for toss objects when they come to a complete rest.  it is set for steping or walking objects
  30
  31 doors, plats, etc are SOLID_BSP, and MOVETYPE_PUSH
  32 bonus items are SOLID_TRIGGER touch, and MOVETYPE_TOSS
  33 corpses are SOLID_NOT and MOVETYPE_TOSS
  34 crates are SOLID_BBOX and MOVETYPE_TOSS
  35 walking monsters are SOLID_SLIDEBOX and MOVETYPE_STEP
  36 flying/floating monsters are SOLID_SLIDEBOX and MOVETYPE_FLY
  37
  38 solid_edge items only clip against bsp models.
  39
  40 */
  41
  42 cvar_t sv_friction = {CVAR_NOTIFY, "sv_friction","4"};
  43 cvar_t sv_stopspeed = {CVAR_NOTIFY, "sv_stopspeed","100"};
  44 cvar_t sv_gravity = {CVAR_NOTIFY, "sv_gravity","800"};
  45 cvar_t sv_maxvelocity = {CVAR_NOTIFY, "sv_maxvelocity","2000"};
  46 cvar_t sv_nostep = {CVAR_NOTIFY, "sv_nostep","0"};
  47 cvar_t sv_stepheight = {CVAR_NOTIFY, "sv_stepheight", "18"};
  48 cvar_t sv_jumpstep = {CVAR_NOTIFY, "sv_jumpstep", "1"};
  49 cvar_t sv_wallfriction = {CVAR_NOTIFY, "sv_wallfriction", "1"};
  50 cvar_t sv_newflymove = {CVAR_NOTIFY, "sv_newflymove", "1"};
  51
  52 #define MOVE_EPSILON    0.01
  53
  54 void SV_Physics_Toss (edict_t *ent);
  55
  56 void SV_Phys_Init (void)
  57 {
  58         Cvar_RegisterVariable(&sv_stepheight);
  59         Cvar_RegisterVariable(&sv_jumpstep);
  60         Cvar_RegisterVariable(&sv_wallfriction);
  61         Cvar_RegisterVariable(&sv_newflymove);
  62 }
  63
  64 /*
  65 ================
  66 SV_CheckAllEnts
  67 ================
  68 */
  69 void SV_CheckAllEnts (void)
  70 {
  71         int e;
  72         edict_t *check;
  73
  74         // see if any solid entities are inside the final position
  75         check = NEXT_EDICT(sv.edicts);
  76         for (e = 1;e < sv.num_edicts;e++, check = NEXT_EDICT(check))
  77         {
  78                 if (check->e->free)
  79                         continue;
  80                 if (check->v->movetype == MOVETYPE_PUSH
  81                  || check->v->movetype == MOVETYPE_NONE
  82                  || check->v->movetype == MOVETYPE_FOLLOW
  83                  || check->v->movetype == MOVETYPE_NOCLIP)
  84                         continue;
  85
  86                 if (SV_TestEntityPosition (check))
  87                         Con_Printf ("entity in invalid position\n");
  88         }
  89 }
  90
  91 /*
  92 ================
  93 SV_CheckVelocity
  94 ================
  95 */
  96 void SV_CheckVelocity (edict_t *ent)
  97 {
  98         int i;
  99         float wishspeed;
 100
 101 //
 102 // bound velocity
 103 //
 104         for (i=0 ; i<3 ; i++)
 105         {
 106                 if (IS_NAN(ent->v->velocity[i]))
 107                 {
 108                         Con_Printf ("Got a NaN velocity on %s\n", PR_GetString(ent->v->classname));
 109                         ent->v->velocity[i] = 0;
 110                 }
 111                 if (IS_NAN(ent->v->origin[i]))
 112                 {
 113                         Con_Printf ("Got a NaN origin on %s\n", PR_GetString(ent->v->classname));
 114                         ent->v->origin[i] = 0;
 115                 }
 116         }
 117
 118         // LordHavoc: max velocity fix, inspired by Maddes's source fixes, but this is faster
 119         wishspeed = DotProduct(ent->v->velocity, ent->v->velocity);
 120         if (wishspeed > sv_maxvelocity.value * sv_maxvelocity.value)
 121         {
 122                 wishspeed = sv_maxvelocity.value / sqrt(wishspeed);
 123                 ent->v->velocity[0] *= wishspeed;
 124                 ent->v->velocity[1] *= wishspeed;
 125                 ent->v->velocity[2] *= wishspeed;
 126         }
 127 }
 128
 129 /*
 130 =============
 131 SV_RunThink
 132
 133 Runs thinking code if time.  There is some play in the exact time the think
 134 function will be called, because it is called before any movement is done
 135 in a frame.  Not used for pushmove objects, because they must be exact.
 136 Returns false if the entity removed itself.
 137 =============
 138 */
 139 qboolean SV_RunThink (edict_t *ent)
 140 {
 141         float thinktime;
 142
 143         thinktime = ent->v->nextthink;
 144         if (thinktime <= 0 || thinktime > sv.time + sv.frametime)
 145                 return true;
 146
 147         // don't let things stay in the past.
 148         // it is possible to start that way by a trigger with a local time.
 149         if (thinktime < sv.time)
 150                 thinktime = sv.time;
 151
 152         ent->v->nextthink = 0;
 153         pr_global_struct->time = thinktime;
 154         pr_global_struct->self = EDICT_TO_PROG(ent);
 155         pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
 156         PR_ExecuteProgram (ent->v->think, "NULL think function");
 157         return !ent->e->free;
 158 }
 159
 160 /*
 161 ==================
 162 SV_Impact
 163
 164 Two entities have touched, so run their touch functions
 165 ==================
 166 */
 167 void SV_Impact (edict_t *e1, edict_t *e2)
 168 {
 169         int old_self, old_other;
 170
 171         old_self = pr_global_struct->self;
 172         old_other = pr_global_struct->other;
 173
 174         pr_global_struct->time = sv.time;
 175         if (e1->v->touch && e1->v->solid != SOLID_NOT)
 176         {
 177                 pr_global_struct->self = EDICT_TO_PROG(e1);
 178                 pr_global_struct->other = EDICT_TO_PROG(e2);
 179                 PR_ExecuteProgram (e1->v->touch, "");
 180         }
 181
 182         if (e2->v->touch && e2->v->solid != SOLID_NOT)
 183         {
 184                 pr_global_struct->self = EDICT_TO_PROG(e2);
 185                 pr_global_struct->other = EDICT_TO_PROG(e1);
 186                 PR_ExecuteProgram (e2->v->touch, "");
 187         }
 188
 189         pr_global_struct->self = old_self;
 190         pr_global_struct->other = old_other;
 191 }
 192
 193
 194 /*
 195 ==================
 196 ClipVelocity
 197
 198 Slide off of the impacting object
 199 returns the blocked flags (1 = floor, 2 = step / wall)
 200 ==================
 201 */
 202 #define STOP_EPSILON 0.1
 203 void ClipVelocity (vec3_t in, vec3_t normal, vec3_t out, float overbounce)
 204 {
 205         int i;
 206         float backoff;
 207
 208         backoff = -DotProduct (in, normal) * overbounce;
 209         VectorMA(in, backoff, normal, out);
 210
 211         for (i = 0;i < 3;i++)
 212                 if (out[i] > -STOP_EPSILON && out[i] < STOP_EPSILON)
 213                         out[i] = 0;
 214 }
 215
 216
 217 /*
 218 ============
 219 SV_FlyMove
 220
 221 The basic solid body movement clip that slides along multiple planes
 222 Returns the clipflags if the velocity was modified (hit something solid)
 223 1 = floor
 224 2 = wall / step
 225 4 = dead stop
 226 If stepnormal is not NULL, the plane normal of any vertical wall hit will be stored
 227 ============
 228 */
 229 // LordHavoc: increased from 5 to 20
 230 #define MAX_CLIP_PLANES 20
 231 int SV_FlyMove (edict_t *ent, float time, float *stepnormal)
 232 {
 233         if (sv_newflymove.integer)
 234         {
 235                 int blocked, impact, bumpcount;
 236                 vec3_t end, primal_velocity;
 237                 trace_t trace;
 238
 239                 blocked = 0;
 240                 VectorCopy (ent->v->velocity, primal_velocity);
 241
 242                 for (bumpcount = 0;bumpcount < 4;bumpcount++)
 243                 {
 244                         if (!ent->v->velocity[0] && !ent->v->velocity[1] && !ent->v->velocity[2])
 245                                 break;
 246
 247                         VectorMA(ent->v->origin, time, ent->v->velocity, end);
 248                         trace = SV_Move (ent->v->origin, ent->v->mins, ent->v->maxs, end, MOVE_NORMAL, ent);
 249                         //Con_Printf("trace %f %f %f : %f : %f %f %f\n", trace.endpos[0], trace.endpos[1], trace.endpos[2], trace.fraction, trace.plane.normal[0], trace.plane.normal[1], trace.plane.normal[2]);
 250
 251                         if (trace.allsolid)
 252                         {
 253                                 // LordHavoc: note: this code is what makes entities stick in place if embedded in another object (which can be the world)
 254                                 // entity is trapped in another solid
 255                                 VectorClear(ent->v->velocity);
 256                                 return 3;
 257                         }
 258
 259                         if (trace.fraction > 0)
 260                         {
 261                                 // actually covered some distance
 262                                 VectorCopy (trace.endpos, ent->v->origin);
 263                         }
 264
 265                         // break if it moved the entire distance
 266                         if (trace.fraction == 1)
 267                                 break;
 268
 269                         if (!trace.ent)
 270                                 Host_Error ("SV_FlyMove: !trace.ent");
 271
 272                         if ((int) ent->v->flags & FL_ONGROUND)
 273                         {
 274                                 if (ent->v->groundentity == EDICT_TO_PROG(trace.ent))
 275                                         impact = false;
 276                                 else
 277                                 {
 278                                         ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
 279                                         impact = true;
 280                                 }
 281                         }
 282                         else
 283                                 impact = true;
 284
 285                         if (trace.plane.normal[2] > 0.7)
 286                         {
 287                                 // floor
 288                                 blocked |= 1;
 289                                 ent->v->flags = (int)ent->v->flags | FL_ONGROUND;
 290                                 ent->v->groundentity = EDICT_TO_PROG(trace.ent);
 291                         }
 292                         if (!trace.plane.normal[2])
 293                         {
 294                                 // step
 295                                 blocked |= 2;
 296                                 // save the trace for player extrafriction
 297                                 if (stepnormal)
 298                                         VectorCopy(trace.plane.normal, stepnormal);
 299                         }
 300
 301                         // run the impact function
 302                         if (impact)
 303                         {
 304                                 SV_Impact (ent, trace.ent);
 305
 306                                 // break if removed by the impact function
 307                                 if (ent->e->free)
 308                                         break;
 309                         }
 310
 311                         time *= 1 - trace.fraction;
 312
 313                         ClipVelocity (ent->v->velocity, trace.plane.normal, ent->v->velocity, 1);
 314                 }
 315
 316                 return blocked;
 317         }
 318         else
 319         {
 320                 int i, j, blocked, impact, numplanes, bumpcount, numbumps;
 321                 float d, time_left;
 322                 vec3_t dir, end, planes[MAX_CLIP_PLANES], primal_velocity, original_velocity, new_velocity;
 323                 trace_t trace;
 324
 325                 numbumps = 4;
 326
 327                 blocked = 0;
 328                 VectorCopy (ent->v->velocity, original_velocity);
 329                 VectorCopy (ent->v->velocity, primal_velocity);
 330                 numplanes = 0;
 331
 332                 time_left = time;
 333
 334                 for (bumpcount=0 ; bumpcount<numbumps ; bumpcount++)
 335                 {
 336                         if (!ent->v->velocity[0] && !ent->v->velocity[1] && !ent->v->velocity[2])
 337                                 break;
 338
 339                         for (i=0 ; i<3 ; i++)
 340                                 end[i] = ent->v->origin[i] + time_left * ent->v->velocity[i];
 341
 342                         trace = SV_Move (ent->v->origin, ent->v->mins, ent->v->maxs, end, MOVE_NORMAL, ent);
 343
 344                         if (trace.allsolid)
 345                         {
 346                                 // LordHavoc: note: this code is what makes entities stick in place if embedded in another object (which can be the world)
 347                                 // entity is trapped in another solid
 348                                 VectorClear(ent->v->velocity);
 349                                 return 3;
 350                         }
 351
 352                         if (trace.fraction > 0)
 353                         {
 354                                 // actually covered some distance
 355                                 VectorCopy (trace.endpos, ent->v->origin);
 356                                 VectorCopy (ent->v->velocity, original_velocity);
 357                                 numplanes = 0;
 358                         }
 359
 360                         // break if it moved the entire distance
 361                         if (trace.fraction == 1)
 362                                 break;
 363
 364                         if (!trace.ent)
 365                                 Host_Error ("SV_FlyMove: !trace.ent");
 366
 367                         if ((int) ent->v->flags & FL_ONGROUND)
 368                         {
 369                                 if (ent->v->groundentity == EDICT_TO_PROG(trace.ent))
 370                                         impact = false;
 371                                 else
 372                                 {
 373                                         ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
 374                                         impact = true;
 375                                 }
 376                         }
 377                         else
 378                                 impact = true;
 379
 380                         if (trace.plane.normal[2] > 0.7)
 381                         {
 382                                 // floor
 383                                 blocked |= 1;
 384                                 ent->v->flags = (int)ent->v->flags | FL_ONGROUND;
 385                                 ent->v->groundentity = EDICT_TO_PROG(trace.ent);
 386                         }
 387                         if (!trace.plane.normal[2])
 388                         {
 389                                 // step
 390                                 blocked |= 2;
 391                                 // save the trace for player extrafriction
 392                                 if (stepnormal)
 393                                         VectorCopy(trace.plane.normal, stepnormal);
 394                         }
 395
 396                         // run the impact function
 397                         if (impact)
 398                         {
 399                                 SV_Impact (ent, trace.ent);
 400
 401                                 // break if removed by the impact function
 402                                 if (ent->e->free)
 403                                         break;
 404                         }
 405
 406
 407                         time_left -= time_left * trace.fraction;
 408
 409                         // clipped to another plane
 410                         if (numplanes >= MAX_CLIP_PLANES)
 411                         {
 412                                 // this shouldn't really happen
 413                                 VectorClear(ent->v->velocity);
 414                                 return 3;
 415                         }
 416
 417                         VectorCopy (trace.plane.normal, planes[numplanes]);
 418                         numplanes++;
 419
 420                         // modify original_velocity so it parallels all of the clip planes
 421                         for (i=0 ; i<numplanes ; i++)
 422                         {
 423                                 ClipVelocity (original_velocity, planes[i], new_velocity, 1);
 424                                 for (j=0 ; j<numplanes ; j++)
 425                                         if (j != i)
 426                                         {
 427                                                 // not ok
 428                                                 if (DotProduct (new_velocity, planes[j]) < 0)
 429                                                         break;
 430                                         }
 431                                 if (j == numplanes)
 432                                         break;
 433                         }
 434
 435                         if (i != numplanes)
 436                         {
 437                                 // go along this plane
 438                                 VectorCopy (new_velocity, ent->v->velocity);
 439                         }
 440                         else
 441                         {
 442                                 // go along the crease
 443                                 if (numplanes != 2)
 444                                 {
 445                                         VectorClear(ent->v->velocity);
 446                                         return 7;
 447                                 }
 448                                 CrossProduct (planes[0], planes[1], dir);
 449                                 // LordHavoc: thanks to taniwha of QuakeForge for pointing out this fix for slowed falling in corners
 450                                 VectorNormalize(dir);
 451                                 d = DotProduct (dir, ent->v->velocity);
 452                                 VectorScale (dir, d, ent->v->velocity);
 453                         }
 454
 455                         // if original velocity is against the original velocity,
 456                         // stop dead to avoid tiny occilations in sloping corners
 457                         if (DotProduct (ent->v->velocity, primal_velocity) <= 0)
 458                         {
 459                                 VectorClear(ent->v->velocity);
 460                                 return blocked;
 461                         }
 462                 }
 463
 464                 return blocked;
 465         }
 466 }
 467
 468
 469 /*
 470 ============
 471 SV_AddGravity
 472
 473 ============
 474 */
 475 void SV_AddGravity (edict_t *ent)
 476 {
 477         float ent_gravity;
 478         eval_t *val;
 479
 480         val = GETEDICTFIELDVALUE(ent, eval_gravity);
 481         if (val!=0 && val->_float)
 482                 ent_gravity = val->_float;
 483         else
 484                 ent_gravity = 1.0;
 485         ent->v->velocity[2] -= ent_gravity * sv_gravity.value * sv.frametime;
 486 }
 487
 488
 489 /*
 490 ===============================================================================
 491
 492 PUSHMOVE
 493
 494 ===============================================================================
 495 */
 496
 497 /*
 498 ============
 499 SV_PushEntity
 500
 501 Does not change the entities velocity at all
 502 ============
 503 */
 504 trace_t SV_PushEntity (edict_t *ent, vec3_t push, vec3_t pushangles)
 505 {
 506         trace_t trace;
 507         vec3_t end;
 508
 509         VectorAdd (ent->v->origin, push, end);
 510
 511         if (ent->v->movetype == MOVETYPE_FLYMISSILE)
 512                 trace = SV_Move (ent->v->origin, ent->v->mins, ent->v->maxs, end, MOVE_MISSILE, ent);
 513         else if (ent->v->solid == SOLID_TRIGGER || ent->v->solid == SOLID_NOT)
 514                 // only clip against bmodels
 515                 trace = SV_Move (ent->v->origin, ent->v->mins, ent->v->maxs, end, MOVE_NOMONSTERS, ent);
 516         else
 517                 trace = SV_Move (ent->v->origin, ent->v->mins, ent->v->maxs, end, MOVE_NORMAL, ent);
 518
 519         VectorCopy (trace.endpos, ent->v->origin);
 520         // FIXME: turn players specially
 521         ent->v->angles[1] += trace.fraction * pushangles[1];
 522         SV_LinkEdict (ent, true);
 523
 524         if (trace.ent && (!((int)ent->v->flags & FL_ONGROUND) || ent->v->groundentity != EDICT_TO_PROG(trace.ent)))
 525                 SV_Impact (ent, trace.ent);
 526         return trace;
 527 }
 528
 529
 530 /*
 531 ============
 532 SV_PushMove
 533
 534 ============
 535 */
 536 trace_t SV_ClipMoveToEntity (edict_t *ent, vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end);
 537 void SV_PushMove (edict_t *pusher, float movetime)
 538 {
 539         int i, e, index;
 540         edict_t *check, *ed;
 541         float savesolid, movetime2, pushltime;
 542         vec3_t mins, maxs, move, move1, moveangle, pushorig, pushang, a, forward, left, up, org, org2;
 543         int num_moved;
 544         model_t *pushermodel;
 545         trace_t trace;
 546
 547         switch ((int) pusher->v->solid)
 548         {
 549         // LordHavoc: valid pusher types
 550         case SOLID_BSP:
 551         case SOLID_BBOX:
 552         case SOLID_SLIDEBOX:
 553         case SOLID_CORPSE: // LordHavoc: this would be weird...
 554                 break;
 555         // LordHavoc: no collisions
 556         case SOLID_NOT:
 557         case SOLID_TRIGGER:
 558                 VectorMA (pusher->v->origin, movetime, pusher->v->velocity, pusher->v->origin);
 559                 VectorMA (pusher->v->angles, movetime, pusher->v->avelocity, pusher->v->angles);
 560                 pusher->v->ltime += movetime;
 561                 SV_LinkEdict (pusher, false);
 562                 return;
 563         default:
 564                 Host_Error("SV_PushMove: unrecognized solid type %f\n", pusher->v->solid);
 565         }
 566         if (!pusher->v->velocity[0] && !pusher->v->velocity[1] && !pusher->v->velocity[2] && !pusher->v->avelocity[0] && !pusher->v->avelocity[1] && !pusher->v->avelocity[2])
 567         {
 568                 pusher->v->ltime += movetime;
 569                 return;
 570         }
 571         index = (int) pusher->v->modelindex;
 572         if (index < 1 || index >= MAX_MODELS)
 573                 Host_Error("SV_PushMove: invalid modelindex %f\n", pusher->v->modelindex);
 574         pushermodel = sv.models[index];
 575
 576         movetime2 = movetime;
 577         VectorScale(pusher->v->velocity, movetime2, move1);
 578         VectorScale(pusher->v->avelocity, movetime2, moveangle);
 579         if (moveangle[0] || moveangle[2])
 580         {
 581                 for (i = 0;i < 3;i++)
 582                 {
 583                         if (move1[i] > 0)
 584                         {
 585                                 mins[i] = pushermodel->rotatedmins[i] + pusher->v->origin[i] - 1;
 586                                 maxs[i] = pushermodel->rotatedmaxs[i] + move1[i] + pusher->v->origin[i] + 1;
 587                         }
 588                         else
 589                         {
 590                                 mins[i] = pushermodel->rotatedmins[i] + move1[i] + pusher->v->origin[i] - 1;
 591                                 maxs[i] = pushermodel->rotatedmaxs[i] + pusher->v->origin[i] + 1;
 592                         }
 593                 }
 594         }
 595         else if (moveangle[1])
 596         {
 597                 for (i = 0;i < 3;i++)
 598                 {
 599                         if (move1[i] > 0)
 600                         {
 601                                 mins[i] = pushermodel->yawmins[i] + pusher->v->origin[i] - 1;
 602                                 maxs[i] = pushermodel->yawmaxs[i] + move1[i] + pusher->v->origin[i] + 1;
 603                         }
 604                         else
 605                         {
 606                                 mins[i] = pushermodel->yawmins[i] + move1[i] + pusher->v->origin[i] - 1;
 607                                 maxs[i] = pushermodel->yawmaxs[i] + pusher->v->origin[i] + 1;
 608                         }
 609                 }
 610         }
 611         else
 612         {
 613                 for (i = 0;i < 3;i++)
 614                 {
 615                         if (move1[i] > 0)
 616                         {
 617                                 mins[i] = pushermodel->normalmins[i] + pusher->v->origin[i] - 1;
 618                                 maxs[i] = pushermodel->normalmaxs[i] + move1[i] + pusher->v->origin[i] + 1;
 619                         }
 620                         else
 621                         {
 622                                 mins[i] = pushermodel->normalmins[i] + move1[i] + pusher->v->origin[i] - 1;
 623                                 maxs[i] = pushermodel->normalmaxs[i] + pusher->v->origin[i] + 1;
 624                         }
 625                 }
 626         }
 627
 628         VectorNegate (moveangle, a);
 629         AngleVectorsFLU (a, forward, left, up);
 630
 631         VectorCopy (pusher->v->origin, pushorig);
 632         VectorCopy (pusher->v->angles, pushang);
 633         pushltime = pusher->v->ltime;
 634
 635 // move the pusher to it's final position
 636
 637         VectorMA (pusher->v->origin, movetime, pusher->v->velocity, pusher->v->origin);
 638         VectorMA (pusher->v->angles, movetime, pusher->v->avelocity, pusher->v->angles);
 639         pusher->v->ltime += movetime;
 640         SV_LinkEdict (pusher, false);
 641
 642         savesolid = pusher->v->solid;
 643
 644 // see if any solid entities are inside the final position
 645         num_moved = 0;
 646         check = NEXT_EDICT(sv.edicts);
 647         for (e = 1;e < sv.num_edicts;e++, check = NEXT_EDICT(check))
 648         {
 649                 if (check->e->free)
 650                         continue;
 651                 if (check->v->movetype == MOVETYPE_PUSH
 652                  || check->v->movetype == MOVETYPE_NONE
 653                  || check->v->movetype == MOVETYPE_FOLLOW
 654                  || check->v->movetype == MOVETYPE_NOCLIP)
 655                         continue;
 656
 657                 // if the entity is standing on the pusher, it will definitely be moved
 658                 if (!(((int)check->v->flags & FL_ONGROUND) && PROG_TO_EDICT(check->v->groundentity) == pusher))
 659                 {
 660                         if (check->v->absmin[0] >= maxs[0]
 661                          || check->v->absmax[0] <= mins[0]
 662                          || check->v->absmin[1] >= maxs[1]
 663                          || check->v->absmax[1] <= mins[1]
 664                          || check->v->absmin[2] >= maxs[2]
 665                          || check->v->absmax[2] <= mins[2])
 666                                 continue;
 667
 668                         trace = SV_ClipMoveToEntity (pusher, check->v->origin, check->v->mins, check->v->maxs, check->v->origin);
 669                         if (!trace.startsolid)
 670                                 continue;
 671                 }
 672
 673                 if (forward[0] < 0.999f) // quick way to check if any rotation is used
 674                 {
 675                         VectorSubtract (check->v->origin, pusher->v->origin, org);
 676                         org2[0] = DotProduct (org, forward);
 677                         org2[1] = DotProduct (org, left);
 678                         org2[2] = DotProduct (org, up);
 679                         VectorSubtract (org2, org, move);
 680                         VectorAdd (move, move1, move);
 681                 }
 682                 else
 683                         VectorCopy (move1, move);
 684
 685                 // remove the onground flag for non-players
 686                 if (check->v->movetype != MOVETYPE_WALK)
 687                         check->v->flags = (int)check->v->flags & ~FL_ONGROUND;
 688
 689                 VectorCopy (check->v->origin, check->e->moved_from);
 690                 VectorCopy (check->v->angles, check->e->moved_fromangles);
 691                 sv.moved_edicts[num_moved++] = check;
 692
 693                 // try moving the contacted entity
 694                 pusher->v->solid = SOLID_NOT;
 695                 trace = SV_PushEntity (check, move, moveangle);
 696                 pusher->v->solid = savesolid; // was SOLID_BSP
 697
 698                 // if it is still inside the pusher, block
 699                 if (SV_TestEntityPosition (check))
 700                 {
 701                         // try moving the contacted entity a tiny bit further to account for precision errors
 702                         pusher->v->solid = SOLID_NOT;
 703                         VectorScale(move, 0.1, move);
 704                         trace = SV_PushEntity (check, move, vec3_origin);
 705                         pusher->v->solid = savesolid;
 706                         if (SV_TestEntityPosition (check))
 707                         {
 708                                 // still inside pusher, so it's really blocked
 709
 710                                 // fail the move
 711                                 if (check->v->mins[0] == check->v->maxs[0])
 712                                         continue;
 713                                 if (check->v->solid == SOLID_NOT || check->v->solid == SOLID_TRIGGER)
 714                                 {
 715                                         // corpse
 716                                         check->v->mins[0] = check->v->mins[1] = 0;
 717                                         VectorCopy (check->v->mins, check->v->maxs);
 718                                         continue;
 719                                 }
 720
 721                                 VectorCopy (pushorig, pusher->v->origin);
 722                                 VectorCopy (pushang, pusher->v->angles);
 723                                 pusher->v->ltime = pushltime;
 724                                 SV_LinkEdict (pusher, false);
 725
 726                                 // move back any entities we already moved
 727                                 for (i = 0;i < num_moved;i++)
 728                                 {
 729                                         ed = sv.moved_edicts[i];
 730                                         VectorCopy (ed->e->moved_from, ed->v->origin);
 731                                         VectorCopy (ed->e->moved_fromangles, ed->v->angles);
 732                                         SV_LinkEdict (ed, false);
 733                                 }
 734
 735                                 // if the pusher has a "blocked" function, call it, otherwise just stay in place until the obstacle is gone
 736                                 if (pusher->v->blocked)
 737                                 {
 738                                         pr_global_struct->self = EDICT_TO_PROG(pusher);
 739                                         pr_global_struct->other = EDICT_TO_PROG(check);
 740                                         PR_ExecuteProgram (pusher->v->blocked, "");
 741                                 }
 742                                 return;
 743                         }
 744                 }
 745         }
 746 }
 747
 748 /*
 749 ================
 750 SV_Physics_Pusher
 751
 752 ================
 753 */
 754 void SV_Physics_Pusher (edict_t *ent)
 755 {
 756         float thinktime, oldltime, movetime;
 757
 758         oldltime = ent->v->ltime;
 759
 760         thinktime = ent->v->nextthink;
 761         if (thinktime < ent->v->ltime + sv.frametime)
 762         {
 763                 movetime = thinktime - ent->v->ltime;
 764                 if (movetime < 0)
 765                         movetime = 0;
 766         }
 767         else
 768                 movetime = sv.frametime;
 769
 770         if (movetime)
 771                 // advances ent->v->ltime if not blocked
 772                 SV_PushMove (ent, movetime);
 773
 774         if (thinktime > oldltime && thinktime <= ent->v->ltime)
 775         {
 776                 ent->v->nextthink = 0;
 777                 pr_global_struct->time = sv.time;
 778                 pr_global_struct->self = EDICT_TO_PROG(ent);
 779                 pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
 780                 PR_ExecuteProgram (ent->v->think, "NULL think function");
 781         }
 782 }
 783
 784
 785 /*
 786 ===============================================================================
 787
 788 CLIENT MOVEMENT
 789
 790 ===============================================================================
 791 */
 792
 793 /*
 794 =============
 795 SV_CheckStuck
 796
 797 This is a big hack to try and fix the rare case of getting stuck in the world
 798 clipping hull.
 799 =============
 800 */
 801 void SV_CheckStuck (edict_t *ent)
 802 {
 803         int i, j, z;
 804         vec3_t org;
 805
 806         if (!SV_TestEntityPosition(ent))
 807         {
 808                 VectorCopy (ent->v->origin, ent->v->oldorigin);
 809                 return;
 810         }
 811
 812         VectorCopy (ent->v->origin, org);
 813         VectorCopy (ent->v->oldorigin, ent->v->origin);
 814         if (!SV_TestEntityPosition(ent))
 815         {
 816                 Con_DPrintf ("Unstuck.\n");
 817                 SV_LinkEdict (ent, true);
 818                 return;
 819         }
 820
 821         for (z=0 ; z< 18 ; z++)
 822                 for (i=-1 ; i <= 1 ; i++)
 823                         for (j=-1 ; j <= 1 ; j++)
 824                         {
 825                                 ent->v->origin[0] = org[0] + i;
 826                                 ent->v->origin[1] = org[1] + j;
 827                                 ent->v->origin[2] = org[2] + z;
 828                                 if (!SV_TestEntityPosition(ent))
 829                                 {
 830                                         Con_DPrintf ("Unstuck.\n");
 831                                         SV_LinkEdict (ent, true);
 832                                         return;
 833                                 }
 834                         }
 835
 836         VectorCopy (org, ent->v->origin);
 837         Con_DPrintf ("player is stuck.\n");
 838 }
 839
 840
 841 /*
 842 =============
 843 SV_CheckWater
 844 =============
 845 */
 846 qboolean SV_CheckWater (edict_t *ent)
 847 {
 848         int cont;
 849         vec3_t point;
 850
 851         point[0] = ent->v->origin[0];
 852         point[1] = ent->v->origin[1];
 853         point[2] = ent->v->origin[2] + ent->v->mins[2] + 1;
 854
 855         ent->v->waterlevel = 0;
 856         ent->v->watertype = CONTENTS_EMPTY;
 857         cont = SV_PointContents(point);
 858         if (cont <= CONTENTS_WATER)
 859         {
 860                 ent->v->watertype = cont;
 861                 ent->v->waterlevel = 1;
 862                 point[2] = ent->v->origin[2] + (ent->v->mins[2] + ent->v->maxs[2])*0.5;
 863                 cont = SV_PointContents(point);
 864                 if (cont <= CONTENTS_WATER)
 865                 {
 866                         ent->v->waterlevel = 2;
 867                         point[2] = ent->v->origin[2] + ent->v->view_ofs[2];
 868                         cont = SV_PointContents(point);
 869                         if (cont <= CONTENTS_WATER)
 870                                 ent->v->waterlevel = 3;
 871                 }
 872         }
 873
 874         return ent->v->waterlevel > 1;
 875 }
 876
 877 /*
 878 ============
 879 SV_WallFriction
 880
 881 ============
 882 */
 883 void SV_WallFriction (edict_t *ent, float *stepnormal)
 884 {
 885         float d, i;
 886         vec3_t forward, into, side;
 887
 888         AngleVectors (ent->v->v_angle, forward, NULL, NULL);
 889         if ((d = DotProduct (stepnormal, forward) + 0.5) < 0)
 890         {
 891                 // cut the tangential velocity
 892                 i = DotProduct (stepnormal, ent->v->velocity);
 893                 VectorScale (stepnormal, i, into);
 894                 VectorSubtract (ent->v->velocity, into, side);
 895                 ent->v->velocity[0] = side[0] * (1 + d);
 896                 ent->v->velocity[1] = side[1] * (1 + d);
 897         }
 898 }
 899
 900 /*
 901 =====================
 902 SV_TryUnstick
 903
 904 Player has come to a dead stop, possibly due to the problem with limited
 905 float precision at some angle joins in the BSP hull.
 906
 907 Try fixing by pushing one pixel in each direction.
 908
 909 This is a hack, but in the interest of good gameplay...
 910 ======================
 911 */
 912 int SV_TryUnstick (edict_t *ent, vec3_t oldvel)
 913 {
 914         int i, clip;
 915         vec3_t oldorg, dir;
 916
 917         VectorCopy (ent->v->origin, oldorg);
 918         VectorClear (dir);
 919
 920         for (i=0 ; i<8 ; i++)
 921         {
 922                 // try pushing a little in an axial direction
 923                 switch (i)
 924                 {
 925                         case 0: dir[0] = 2; dir[1] = 0; break;
 926                         case 1: dir[0] = 0; dir[1] = 2; break;
 927                         case 2: dir[0] = -2; dir[1] = 0; break;
 928                         case 3: dir[0] = 0; dir[1] = -2; break;
 929                         case 4: dir[0] = 2; dir[1] = 2; break;
 930                         case 5: dir[0] = -2; dir[1] = 2; break;
 931                         case 6: dir[0] = 2; dir[1] = -2; break;
 932                         case 7: dir[0] = -2; dir[1] = -2; break;
 933                 }
 934
 935                 SV_PushEntity (ent, dir, vec3_origin);
 936
 937                 // retry the original move
 938                 ent->v->velocity[0] = oldvel[0];
 939                 ent->v->velocity[1] = oldvel[1];
 940                 ent->v->velocity[2] = 0;
 941                 clip = SV_FlyMove (ent, 0.1, NULL);
 942
 943                 if (fabs(oldorg[1] - ent->v->origin[1]) > 4
 944                  || fabs(oldorg[0] - ent->v->origin[0]) > 4)
 945                         return clip;
 946
 947                 // go back to the original pos and try again
 948                 VectorCopy (oldorg, ent->v->origin);
 949         }
 950
 951         // still not moving
 952         VectorClear (ent->v->velocity);
 953         return 7;
 954 }
 955
 956 /*
 957 =====================
 958 SV_WalkMove
 959
 960 Only used by players
 961 ======================
 962 */
 963 void SV_WalkMove (edict_t *ent)
 964 {
 965         int clip, oldonground;
 966         vec3_t upmove, downmove, oldorg, oldvel, nosteporg, nostepvel, stepnormal;
 967         trace_t downtrace;
 968
 969         // do a regular slide move unless it looks like you ran into a step
 970         oldonground = (int)ent->v->flags & FL_ONGROUND;
 971         ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
 972
 973         VectorCopy (ent->v->origin, oldorg);
 974         VectorCopy (ent->v->velocity, oldvel);
 975
 976         clip = SV_FlyMove (ent, sv.frametime, NULL);
 977
 978         // if move didn't block on a step, return
 979         if ( !(clip & 2) )
 980                 return;
 981
 982         if (ent->v->movetype != MOVETYPE_FLY)
 983         {
 984                 if (!oldonground && ent->v->waterlevel == 0 && !sv_jumpstep.integer)
 985                         // don't stair up while jumping
 986                         return;
 987
 988                 if (ent->v->movetype != MOVETYPE_WALK)
 989                         // gibbed by a trigger
 990                         return;
 991         }
 992
 993         if (sv_nostep.integer)
 994                 return;
 995
 996         if ( (int)ent->v->flags & FL_WATERJUMP )
 997                 return;
 998
 999         VectorCopy (ent->v->origin, nosteporg);
1000         VectorCopy (ent->v->velocity, nostepvel);
1001
1002         // try moving up and forward to go up a step
1003         // back to start pos
1004         VectorCopy (oldorg, ent->v->origin);
1005
1006         VectorClear (upmove);
1007         VectorClear (downmove);
1008         upmove[2] = sv_stepheight.value;
1009         downmove[2] = -sv_stepheight.value + oldvel[2]*sv.frametime;
1010
1011         // move up
1012         // FIXME: don't link?
1013         SV_PushEntity (ent, upmove, vec3_origin);
1014
1015         // move forward
1016         ent->v->velocity[0] = oldvel[0];
1017         ent->v->velocity[1] = oldvel[1];
1018         ent->v->velocity[2] = 0;
1019         clip = SV_FlyMove (ent, sv.frametime, stepnormal);
1020         ent->v->velocity[2] += oldvel[2];
1021
1022         // check for stuckness, possibly due to the limited precision of floats
1023         // in the clipping hulls
1024         if (clip
1025          && fabs(oldorg[1] - ent->v->origin[1]) < 0.03125
1026          && fabs(oldorg[0] - ent->v->origin[0]) < 0.03125)
1027                 // stepping up didn't make any progress
1028                 clip = SV_TryUnstick (ent, oldvel);
1029
1030         // extra friction based on view angle
1031         if (clip & 2 && sv_wallfriction.integer)
1032                 SV_WallFriction (ent, stepnormal);
1033
1034         // move down
1035         // FIXME: don't link?
1036         downtrace = SV_PushEntity (ent, downmove, vec3_origin);
1037
1038         if (downtrace.plane.normal[2] > 0.7)
1039         {
1040                 // LordHavoc: disabled this so you can walk on monsters/players
1041                 //if (ent->v->solid == SOLID_BSP)
1042                 {
1043                         ent->v->flags = (int)ent->v->flags | FL_ONGROUND;
1044                         ent->v->groundentity = EDICT_TO_PROG(downtrace.ent);
1045                 }
1046         }
1047         else
1048         {
1049                 // if the push down didn't end up on good ground, use the move without
1050                 // the step up.  This happens near wall / slope combinations, and can
1051                 // cause the player to hop up higher on a slope too steep to climb
1052                 VectorCopy (nosteporg, ent->v->origin);
1053                 VectorCopy (nostepvel, ent->v->velocity);
1054         }
1055 }
1056
1057 //============================================================================
1058
1059 /*
1060 =============
1061 SV_Physics_Follow
1062
1063 Entities that are "stuck" to another entity
1064 =============
1065 */
1066 void SV_Physics_Follow (edict_t *ent)
1067 {
1068         vec3_t vf, vr, vu, angles, v;
1069         edict_t *e;
1070
1071         // regular thinking
1072         if (!SV_RunThink (ent))
1073                 return;
1074
1075         // LordHavoc: implemented rotation on MOVETYPE_FOLLOW objects
1076         e = PROG_TO_EDICT(ent->v->aiment);
1077         if (e->v->angles[0] == ent->v->punchangle[0] && e->v->angles[1] == ent->v->punchangle[1] && e->v->angles[2] == ent->v->punchangle[2])
1078         {
1079                 // quick case for no rotation
1080                 VectorAdd(e->v->origin, ent->v->view_ofs, ent->v->origin);
1081         }
1082         else
1083         {
1084                 angles[0] = -ent->v->punchangle[0];
1085                 angles[1] =  ent->v->punchangle[1];
1086                 angles[2] =  ent->v->punchangle[2];
1087                 AngleVectors (angles, vf, vr, vu);
1088                 v[0] = ent->v->view_ofs[0] * vf[0] + ent->v->view_ofs[1] * vr[0] + ent->v->view_ofs[2] * vu[0];
1089                 v[1] = ent->v->view_ofs[0] * vf[1] + ent->v->view_ofs[1] * vr[1] + ent->v->view_ofs[2] * vu[1];
1090                 v[2] = ent->v->view_ofs[0] * vf[2] + ent->v->view_ofs[1] * vr[2] + ent->v->view_ofs[2] * vu[2];
1091                 angles[0] = -e->v->angles[0];
1092                 angles[1] =  e->v->angles[1];
1093                 angles[2] =  e->v->angles[2];
1094                 AngleVectors (angles, vf, vr, vu);
1095                 ent->v->origin[0] = v[0] * vf[0] + v[1] * vf[1] + v[2] * vf[2] + e->v->origin[0];
1096                 ent->v->origin[1] = v[0] * vr[0] + v[1] * vr[1] + v[2] * vr[2] + e->v->origin[1];
1097                 ent->v->origin[2] = v[0] * vu[0] + v[1] * vu[1] + v[2] * vu[2] + e->v->origin[2];
1098         }
1099         VectorAdd (e->v->angles, ent->v->v_angle, ent->v->angles);
1100         SV_LinkEdict (ent, true);
1101 }
1102
1103 /*
1104 =============
1105 SV_Physics_Noclip
1106
1107 A moving object that doesn't obey physics
1108 =============
1109 */
1110 void SV_Physics_Noclip (edict_t *ent)
1111 {
1112         // regular thinking
1113         if (!SV_RunThink (ent))
1114                 return;
1115
1116         VectorMA (ent->v->angles, sv.frametime, ent->v->avelocity, ent->v->angles);
1117         VectorMA (ent->v->origin, sv.frametime, ent->v->velocity, ent->v->origin);
1118
1119         SV_LinkEdict (ent, false);
1120 }
1121
1122 /*
1123 ==============================================================================
1124
1125 TOSS / BOUNCE
1126
1127 ==============================================================================
1128 */
1129
1130 /*
1131 =============
1132 SV_CheckWaterTransition
1133
1134 =============
1135 */
1136 void SV_CheckWaterTransition (edict_t *ent)
1137 {
1138         int cont;
1139         cont = SV_PointContents(ent->v->origin);
1140         if (!ent->v->watertype)
1141         {
1142                 // just spawned here
1143                 ent->v->watertype = cont;
1144                 ent->v->waterlevel = 1;
1145                 return;
1146         }
1147
1148         if (cont <= CONTENTS_WATER)
1149         {
1150                 if (ent->v->watertype == CONTENTS_EMPTY && cont != CONTENTS_LAVA)
1151                         // just crossed into water
1152                         SV_StartSound (ent, 0, "misc/h2ohit1.wav", 255, 1);
1153
1154                 ent->v->watertype = cont;
1155                 ent->v->waterlevel = 1;
1156         }
1157         else
1158         {
1159                 if (ent->v->watertype != CONTENTS_EMPTY && ent->v->watertype != CONTENTS_LAVA)
1160                         // just crossed into water
1161                         SV_StartSound (ent, 0, "misc/h2ohit1.wav", 255, 1);
1162
1163                 ent->v->watertype = CONTENTS_EMPTY;
1164                 ent->v->waterlevel = cont;
1165         }
1166 }
1167
1168 /*
1169 =============
1170 SV_Physics_Toss
1171
1172 Toss, bounce, and fly movement.  When onground, do nothing.
1173 =============
1174 */
1175 void SV_Physics_Toss (edict_t *ent)
1176 {
1177         trace_t trace;
1178         vec3_t move;
1179         edict_t *groundentity;
1180
1181         // regular thinking
1182         if (!SV_RunThink (ent))
1183                 return;
1184
1185 // if onground, return without moving
1186         if ((int)ent->v->flags & FL_ONGROUND)
1187         {
1188                 if (ent->v->groundentity == 0)
1189                         return;
1190                 // if ent was supported by a brush model on previous frame,
1191                 // and groundentity is now freed, set groundentity to 0 (floating)
1192                 groundentity = PROG_TO_EDICT(ent->v->groundentity);
1193                 if (groundentity->v->solid == SOLID_BSP)
1194                 {
1195                         ent->e->suspendedinairflag = true;
1196                         return;
1197                 }
1198                 else if (ent->e->suspendedinairflag && groundentity->e->free)
1199                 {
1200                         // leave it suspended in the air
1201                         ent->v->groundentity = 0;
1202                         ent->e->suspendedinairflag = false;
1203                         return;
1204                 }
1205         }
1206         ent->e->suspendedinairflag = false;
1207
1208         SV_CheckVelocity (ent);
1209
1210 // add gravity
1211         if (ent->v->movetype == MOVETYPE_TOSS || ent->v->movetype == MOVETYPE_BOUNCE)
1212                 SV_AddGravity (ent);
1213
1214 // move angles
1215         VectorMA (ent->v->angles, sv.frametime, ent->v->avelocity, ent->v->angles);
1216
1217 // move origin
1218         VectorScale (ent->v->velocity, sv.frametime, move);
1219         trace = SV_PushEntity (ent, move, vec3_origin);
1220         if (ent->e->free)
1221                 return;
1222
1223         if (trace.fraction < 1)
1224         {
1225                 if (ent->v->movetype == MOVETYPE_BOUNCEMISSILE)
1226                 {
1227                         ClipVelocity (ent->v->velocity, trace.plane.normal, ent->v->velocity, 2.0);
1228                         ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
1229                 }
1230                 else if (ent->v->movetype == MOVETYPE_BOUNCE)
1231                 {
1232                         ClipVelocity (ent->v->velocity, trace.plane.normal, ent->v->velocity, 1.5);
1233                         // LordHavoc: fixed grenades not bouncing when fired down a slope
1234                         if (trace.plane.normal[2] > 0.7 && DotProduct(trace.plane.normal, ent->v->velocity) < 60)
1235                         {
1236                                 ent->v->flags = (int)ent->v->flags | FL_ONGROUND;
1237                                 ent->v->groundentity = EDICT_TO_PROG(trace.ent);
1238                                 VectorClear (ent->v->velocity);
1239                                 VectorClear (ent->v->avelocity);
1240                         }
1241                         else
1242                                 ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
1243                 }
1244                 else
1245                 {
1246                         ClipVelocity (ent->v->velocity, trace.plane.normal, ent->v->velocity, 1.0);
1247                         if (trace.plane.normal[2] > 0.7)
1248                         {
1249                                 ent->v->flags = (int)ent->v->flags | FL_ONGROUND;
1250                                 ent->v->groundentity = EDICT_TO_PROG(trace.ent);
1251                                 VectorClear (ent->v->velocity);
1252                                 VectorClear (ent->v->avelocity);
1253                         }
1254                         else
1255                                 ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
1256                 }
1257         }
1258
1259 // check for in water
1260         SV_CheckWaterTransition (ent);
1261 }
1262
1263 /*
1264 ===============================================================================
1265
1266 STEPPING MOVEMENT
1267
1268 ===============================================================================
1269 */
1270
1271 /*
1272 =============
1273 SV_Physics_Step
1274
1275 Monsters freefall when they don't have a ground entity, otherwise
1276 all movement is done with discrete steps.
1277
1278 This is also used for objects that have become still on the ground, but
1279 will fall if the floor is pulled out from under them.
1280 =============
1281 */
1282 void SV_Physics_Step (edict_t *ent)
1283 {
1284         // freefall if not onground/fly/swim
1285         if (!((int)ent->v->flags & (FL_ONGROUND | FL_FLY | FL_SWIM)))
1286         {
1287                 int hitsound = ent->v->velocity[2] < sv_gravity.value * -0.1;
1288
1289                 SV_AddGravity(ent);
1290                 SV_CheckVelocity(ent);
1291                 SV_FlyMove(ent, sv.frametime, NULL);
1292                 SV_LinkEdict(ent, false);
1293
1294                 // just hit ground
1295                 if (hitsound && (int)ent->v->flags & FL_ONGROUND)
1296                         SV_StartSound(ent, 0, "demon/dland2.wav", 255, 1);
1297         }
1298
1299 // regular thinking
1300         SV_RunThink(ent);
1301
1302         SV_CheckWaterTransition(ent);
1303 }
1304
1305 //============================================================================
1306
1307 /*
1308 ================
1309 SV_Physics
1310
1311 ================
1312 */
1313 void SV_Physics (void)
1314 {
1315         int i;
1316         edict_t *ent;
1317
1318 // let the progs know that a new frame has started
1319         pr_global_struct->self = EDICT_TO_PROG(sv.edicts);
1320         pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
1321         pr_global_struct->time = sv.time;
1322         PR_ExecuteProgram (pr_global_struct->StartFrame, "QC function StartFrame is missing");
1323
1324 //
1325 // treat each object in turn
1326 //
1327         ent = sv.edicts;
1328         for (i=0 ; i<sv.num_edicts ; i++, ent = NEXT_EDICT(ent))
1329         {
1330                 if (ent->e->free)
1331                         continue;
1332
1333                 if (pr_global_struct->force_retouch)
1334                         SV_LinkEdict (ent, true);       // force retouch even for stationary
1335
1336                 if (i > 0 && i <= svs.maxclients)
1337                 {
1338                         if (!svs.clients[i-1].active)
1339                                 continue;
1340                         // connected slot
1341                         // call standard client pre-think
1342                         SV_CheckVelocity (ent);
1343                         pr_global_struct->time = sv.time;
1344                         pr_global_struct->self = EDICT_TO_PROG(ent);
1345                         PR_ExecuteProgram (pr_global_struct->PlayerPreThink, "QC function PlayerPreThink is missing");
1346                         SV_CheckVelocity (ent);
1347                 }
1348
1349                 // LordHavoc: merged client and normal entity physics
1350                 switch ((int) ent->v->movetype)
1351                 {
1352                 case MOVETYPE_PUSH:
1353                         SV_Physics_Pusher (ent);
1354                         break;
1355                 case MOVETYPE_NONE:
1356                         // LordHavoc: manually inlined the thinktime check here because MOVETYPE_NONE is used on so many objects
1357                         if (ent->v->nextthink > 0 && ent->v->nextthink <= sv.time + sv.frametime)
1358                                 SV_RunThink (ent);
1359                         break;
1360                 case MOVETYPE_FOLLOW:
1361                         SV_Physics_Follow (ent);
1362                         break;
1363                 case MOVETYPE_NOCLIP:
1364                         if (i > 0 && i <= svs.maxclients)
1365                         {
1366                                 if (SV_RunThink (ent))
1367                                 {
1368                                         SV_CheckWater (ent);
1369                                         VectorMA (ent->v->origin, sv.frametime, ent->v->velocity, ent->v->origin);
1370                                         VectorMA (ent->v->angles, sv.frametime, ent->v->avelocity, ent->v->angles);
1371                                 }
1372                         }
1373                         else
1374                                 SV_Physics_Noclip (ent);
1375                         break;
1376                 case MOVETYPE_STEP:
1377                         SV_Physics_Step (ent);
1378                         break;
1379                 case MOVETYPE_WALK:
1380                         if (SV_RunThink (ent))
1381                         {
1382                                 if (!SV_CheckWater (ent) && ! ((int)ent->v->flags & FL_WATERJUMP) )
1383                                         SV_AddGravity (ent);
1384                                 SV_CheckStuck (ent);
1385                                 SV_WalkMove (ent);
1386                                 SV_LinkEdict (ent, true);
1387                         }
1388                         break;
1389                 case MOVETYPE_TOSS:
1390                 case MOVETYPE_BOUNCE:
1391                 case MOVETYPE_BOUNCEMISSILE:
1392                 case MOVETYPE_FLYMISSILE:
1393                         SV_Physics_Toss (ent);
1394                         break;
1395                 case MOVETYPE_FLY:
1396                         if (i > 0 && i <= svs.maxclients)
1397                         {
1398                                 if (SV_RunThink (ent))
1399                                 {
1400                                         SV_CheckWater (ent);
1401                                         SV_WalkMove (ent);
1402                                 }
1403                         }
1404                         else
1405                                 SV_Physics_Toss (ent);
1406                         break;
1407                 default:
1408                         Host_Error ("SV_Physics: bad movetype %i", (int)ent->v->movetype);
1409                         break;
1410                 }
1411
1412                 if (i > 0 && i <= svs.maxclients && !ent->e->free)
1413                 {
1414                         SV_CheckVelocity (ent);
1415
1416                         // call standard player post-think
1417                         SV_LinkEdict (ent, true);
1418
1419                         SV_CheckVelocity (ent);
1420
1421                         pr_global_struct->time = sv.time;
1422                         pr_global_struct->self = EDICT_TO_PROG(ent);
1423                         PR_ExecuteProgram (pr_global_struct->PlayerPostThink, "QC function PlayerPostThink is missing");
1424                 }
1425         }
1426
1427         if (pr_global_struct->force_retouch)
1428                 pr_global_struct->force_retouch--;
1429
1430         // LordHavoc: endframe support
1431         if (EndFrameQC)
1432         {
1433                 pr_global_struct->self = EDICT_TO_PROG(sv.edicts);
1434                 pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
1435                 pr_global_struct->time = sv.time;
1436                 PR_ExecuteProgram ((func_t)(EndFrameQC - pr_functions), "");
1437         }
1438
1439         sv.time += sv.frametime;
1440 }
1441
1442
1443 trace_t SV_Trace_Toss (edict_t *tossent, edict_t *ignore)
1444 {
1445         int i;
1446         float gravity, savesolid;
1447         vec3_t move, end;
1448         edict_t tempent, *tent;
1449         entvars_t vars;
1450         eval_t *val;
1451         trace_t trace;
1452
1453         // copy the vars over
1454         memcpy(&vars, tossent->v, sizeof(entvars_t));
1455         // set up the temp entity to point to the copied vars
1456         tent = &tempent;
1457         tent->v = &vars;
1458
1459         savesolid = tossent->v->solid;
1460         tossent->v->solid = SOLID_NOT;
1461
1462         // this has to fetch the field from the original edict, since our copy is truncated
1463         val = GETEDICTFIELDVALUE(tossent, eval_gravity);
1464         if (val != NULL && val->_float != 0)
1465                 gravity = val->_float;
1466         else
1467                 gravity = 1.0;
1468         gravity *= sv_gravity.value * 0.05;
1469
1470         for (i = 0;i < 200;i++) // LordHavoc: sanity check; never trace more than 10 seconds
1471         {
1472                 SV_CheckVelocity (tent);
1473                 tent->v->velocity[2] -= gravity;
1474                 VectorMA (tent->v->angles, 0.05, tent->v->avelocity, tent->v->angles);
1475                 VectorScale (tent->v->velocity, 0.05, move);
1476                 VectorAdd (tent->v->origin, move, end);
1477                 trace = SV_Move (tent->v->origin, tent->v->mins, tent->v->maxs, end, MOVE_NORMAL, tent);
1478                 VectorCopy (trace.endpos, tent->v->origin);
1479
1480                 if (trace.fraction < 1 && trace.ent)
1481                         if (trace.ent != ignore)
1482                                 break;
1483         }
1484         tossent->v->solid = savesolid;
1485         trace.fraction = 0; // not relevant
1486         return trace;
1487 }
1488