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                 if (ent->e->free)
 782                         return;
 783         }
 784
 785 }
 786
 787
 788 /*
 789 ===============================================================================
 790
 791 CLIENT MOVEMENT
 792
 793 ===============================================================================
 794 */
 795
 796 /*
 797 =============
 798 SV_CheckStuck
 799
 800 This is a big hack to try and fix the rare case of getting stuck in the world
 801 clipping hull.
 802 =============
 803 */
 804 void SV_CheckStuck (edict_t *ent)
 805 {
 806         int i, j, z;
 807         vec3_t org;
 808
 809         if (!SV_TestEntityPosition(ent))
 810         {
 811                 VectorCopy (ent->v->origin, ent->v->oldorigin);
 812                 return;
 813         }
 814
 815         VectorCopy (ent->v->origin, org);
 816         VectorCopy (ent->v->oldorigin, ent->v->origin);
 817         if (!SV_TestEntityPosition(ent))
 818         {
 819                 Con_DPrintf ("Unstuck.\n");
 820                 SV_LinkEdict (ent, true);
 821                 return;
 822         }
 823
 824         for (z=0 ; z< 18 ; z++)
 825                 for (i=-1 ; i <= 1 ; i++)
 826                         for (j=-1 ; j <= 1 ; j++)
 827                         {
 828                                 ent->v->origin[0] = org[0] + i;
 829                                 ent->v->origin[1] = org[1] + j;
 830                                 ent->v->origin[2] = org[2] + z;
 831                                 if (!SV_TestEntityPosition(ent))
 832                                 {
 833                                         Con_DPrintf ("Unstuck.\n");
 834                                         SV_LinkEdict (ent, true);
 835                                         return;
 836                                 }
 837                         }
 838
 839         VectorCopy (org, ent->v->origin);
 840         Con_DPrintf ("player is stuck.\n");
 841 }
 842
 843
 844 /*
 845 =============
 846 SV_CheckWater
 847 =============
 848 */
 849 qboolean SV_CheckWater (edict_t *ent)
 850 {
 851         int cont;
 852         vec3_t point;
 853
 854         point[0] = ent->v->origin[0];
 855         point[1] = ent->v->origin[1];
 856         point[2] = ent->v->origin[2] + ent->v->mins[2] + 1;
 857
 858         ent->v->waterlevel = 0;
 859         ent->v->watertype = CONTENTS_EMPTY;
 860         cont = Mod_PointContents(point, sv.worldmodel);
 861         if (cont <= CONTENTS_WATER)
 862         {
 863                 ent->v->watertype = cont;
 864                 ent->v->waterlevel = 1;
 865                 point[2] = ent->v->origin[2] + (ent->v->mins[2] + ent->v->maxs[2])*0.5;
 866                 cont = Mod_PointContents(point, sv.worldmodel);
 867                 if (cont <= CONTENTS_WATER)
 868                 {
 869                         ent->v->waterlevel = 2;
 870                         point[2] = ent->v->origin[2] + ent->v->view_ofs[2];
 871                         cont = Mod_PointContents(point, sv.worldmodel);
 872                         if (cont <= CONTENTS_WATER)
 873                                 ent->v->waterlevel = 3;
 874                 }
 875         }
 876
 877         return ent->v->waterlevel > 1;
 878 }
 879
 880 /*
 881 ============
 882 SV_WallFriction
 883
 884 ============
 885 */
 886 void SV_WallFriction (edict_t *ent, float *stepnormal)
 887 {
 888         float d, i;
 889         vec3_t forward, into, side;
 890
 891         AngleVectors (ent->v->v_angle, forward, NULL, NULL);
 892         d = DotProduct (stepnormal, forward);
 893
 894         d += 0.5;
 895         if (d >= 0)
 896                 return;
 897
 898         // cut the tangential velocity
 899         i = DotProduct (stepnormal, ent->v->velocity);
 900         VectorScale (stepnormal, i, into);
 901         VectorSubtract (ent->v->velocity, into, side);
 902
 903         ent->v->velocity[0] = side[0] * (1 + d);
 904         ent->v->velocity[1] = side[1] * (1 + d);
 905 }
 906
 907 /*
 908 =====================
 909 SV_TryUnstick
 910
 911 Player has come to a dead stop, possibly due to the problem with limited
 912 float precision at some angle joins in the BSP hull.
 913
 914 Try fixing by pushing one pixel in each direction.
 915
 916 This is a hack, but in the interest of good gameplay...
 917 ======================
 918 */
 919 int SV_TryUnstick (edict_t *ent, vec3_t oldvel)
 920 {
 921         int i, clip;
 922         vec3_t oldorg, dir;
 923
 924         VectorCopy (ent->v->origin, oldorg);
 925         VectorClear (dir);
 926
 927         for (i=0 ; i<8 ; i++)
 928         {
 929                 // try pushing a little in an axial direction
 930                 switch (i)
 931                 {
 932                         case 0: dir[0] = 2; dir[1] = 0; break;
 933                         case 1: dir[0] = 0; dir[1] = 2; break;
 934                         case 2: dir[0] = -2; dir[1] = 0; break;
 935                         case 3: dir[0] = 0; dir[1] = -2; break;
 936                         case 4: dir[0] = 2; dir[1] = 2; break;
 937                         case 5: dir[0] = -2; dir[1] = 2; break;
 938                         case 6: dir[0] = 2; dir[1] = -2; break;
 939                         case 7: dir[0] = -2; dir[1] = -2; break;
 940                 }
 941
 942                 SV_PushEntity (ent, dir, vec3_origin);
 943
 944                 // retry the original move
 945                 ent->v->velocity[0] = oldvel[0];
 946                 ent->v->velocity[1] = oldvel[1];
 947                 ent->v->velocity[2] = 0;
 948                 clip = SV_FlyMove (ent, 0.1, NULL);
 949
 950                 if (fabs(oldorg[1] - ent->v->origin[1]) > 4
 951                  || fabs(oldorg[0] - ent->v->origin[0]) > 4)
 952                         return clip;
 953
 954                 // go back to the original pos and try again
 955                 VectorCopy (oldorg, ent->v->origin);
 956         }
 957
 958         // still not moving
 959         VectorClear (ent->v->velocity);
 960         return 7;
 961 }
 962
 963 /*
 964 =====================
 965 SV_WalkMove
 966
 967 Only used by players
 968 ======================
 969 */
 970 void SV_WalkMove (edict_t *ent)
 971 {
 972         int clip, oldonground;
 973         vec3_t upmove, downmove, oldorg, oldvel, nosteporg, nostepvel, stepnormal;
 974         trace_t downtrace;
 975
 976         // do a regular slide move unless it looks like you ran into a step
 977         oldonground = (int)ent->v->flags & FL_ONGROUND;
 978         ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
 979
 980         VectorCopy (ent->v->origin, oldorg);
 981         VectorCopy (ent->v->velocity, oldvel);
 982
 983         clip = SV_FlyMove (ent, sv.frametime, NULL);
 984
 985         // if move didn't block on a step, return
 986         if ( !(clip & 2) )
 987                 return;
 988
 989         if (ent->v->movetype != MOVETYPE_FLY)
 990         {
 991                 if (!oldonground && ent->v->waterlevel == 0 && !sv_jumpstep.integer)
 992                         // don't stair up while jumping
 993                         return;
 994
 995                 if (ent->v->movetype != MOVETYPE_WALK)
 996                         // gibbed by a trigger
 997                         return;
 998         }
 999
1000         if (sv_nostep.integer)
1001                 return;
1002
1003         if ( (int)ent->v->flags & FL_WATERJUMP )
1004                 return;
1005
1006         VectorCopy (ent->v->origin, nosteporg);
1007         VectorCopy (ent->v->velocity, nostepvel);
1008
1009         // try moving up and forward to go up a step
1010         // back to start pos
1011         VectorCopy (oldorg, ent->v->origin);
1012
1013         VectorClear (upmove);
1014         VectorClear (downmove);
1015         upmove[2] = sv_stepheight.value;
1016         downmove[2] = -sv_stepheight.value + oldvel[2]*sv.frametime;
1017
1018         // move up
1019         // FIXME: don't link?
1020         SV_PushEntity (ent, upmove, vec3_origin);
1021
1022         // move forward
1023         ent->v->velocity[0] = oldvel[0];
1024         ent->v->velocity[1] = oldvel[1];
1025         ent->v->velocity[2] = 0;
1026         clip = SV_FlyMove (ent, sv.frametime, stepnormal);
1027         ent->v->velocity[2] += oldvel[2];
1028
1029         // check for stuckness, possibly due to the limited precision of floats
1030         // in the clipping hulls
1031         if (clip
1032          && fabs(oldorg[1] - ent->v->origin[1]) < 0.03125
1033          && fabs(oldorg[0] - ent->v->origin[0]) < 0.03125)
1034                 // stepping up didn't make any progress
1035                 clip = SV_TryUnstick (ent, oldvel);
1036
1037         // extra friction based on view angle
1038         if (clip & 2 && sv_wallfriction.integer)
1039                 SV_WallFriction (ent, stepnormal);
1040
1041         // move down
1042         // FIXME: don't link?
1043         downtrace = SV_PushEntity (ent, downmove, vec3_origin);
1044
1045         if (downtrace.plane.normal[2] > 0.7)
1046         {
1047                 // LordHavoc: disabled this so you can walk on monsters/players
1048                 //if (ent->v->solid == SOLID_BSP)
1049                 {
1050                         ent->v->flags = (int)ent->v->flags | FL_ONGROUND;
1051                         ent->v->groundentity = EDICT_TO_PROG(downtrace.ent);
1052                 }
1053         }
1054         else
1055         {
1056                 // if the push down didn't end up on good ground, use the move without
1057                 // the step up.  This happens near wall / slope combinations, and can
1058                 // cause the player to hop up higher on a slope too steep to climb
1059                 VectorCopy (nosteporg, ent->v->origin);
1060                 VectorCopy (nostepvel, ent->v->velocity);
1061         }
1062 }
1063
1064 //============================================================================
1065
1066 /*
1067 =============
1068 SV_Physics_Follow
1069
1070 Entities that are "stuck" to another entity
1071 =============
1072 */
1073 void SV_Physics_Follow (edict_t *ent)
1074 {
1075         vec3_t vf, vr, vu, angles, v;
1076         edict_t *e;
1077
1078         // regular thinking
1079         if (!SV_RunThink (ent))
1080                 return;
1081
1082         // LordHavoc: implemented rotation on MOVETYPE_FOLLOW objects
1083         e = PROG_TO_EDICT(ent->v->aiment);
1084         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])
1085         {
1086                 // quick case for no rotation
1087                 VectorAdd(e->v->origin, ent->v->view_ofs, ent->v->origin);
1088         }
1089         else
1090         {
1091                 angles[0] = -ent->v->punchangle[0];
1092                 angles[1] =  ent->v->punchangle[1];
1093                 angles[2] =  ent->v->punchangle[2];
1094                 AngleVectors (angles, vf, vr, vu);
1095                 v[0] = ent->v->view_ofs[0] * vf[0] + ent->v->view_ofs[1] * vr[0] + ent->v->view_ofs[2] * vu[0];
1096                 v[1] = ent->v->view_ofs[0] * vf[1] + ent->v->view_ofs[1] * vr[1] + ent->v->view_ofs[2] * vu[1];
1097                 v[2] = ent->v->view_ofs[0] * vf[2] + ent->v->view_ofs[1] * vr[2] + ent->v->view_ofs[2] * vu[2];
1098                 angles[0] = -e->v->angles[0];
1099                 angles[1] =  e->v->angles[1];
1100                 angles[2] =  e->v->angles[2];
1101                 AngleVectors (angles, vf, vr, vu);
1102                 ent->v->origin[0] = v[0] * vf[0] + v[1] * vf[1] + v[2] * vf[2] + e->v->origin[0];
1103                 ent->v->origin[1] = v[0] * vr[0] + v[1] * vr[1] + v[2] * vr[2] + e->v->origin[1];
1104                 ent->v->origin[2] = v[0] * vu[0] + v[1] * vu[1] + v[2] * vu[2] + e->v->origin[2];
1105         }
1106         VectorAdd (e->v->angles, ent->v->v_angle, ent->v->angles);
1107         SV_LinkEdict (ent, true);
1108 }
1109
1110 /*
1111 =============
1112 SV_Physics_Noclip
1113
1114 A moving object that doesn't obey physics
1115 =============
1116 */
1117 void SV_Physics_Noclip (edict_t *ent)
1118 {
1119         // regular thinking
1120         if (!SV_RunThink (ent))
1121                 return;
1122
1123         VectorMA (ent->v->angles, sv.frametime, ent->v->avelocity, ent->v->angles);
1124         VectorMA (ent->v->origin, sv.frametime, ent->v->velocity, ent->v->origin);
1125
1126         SV_LinkEdict (ent, false);
1127 }
1128
1129 /*
1130 ==============================================================================
1131
1132 TOSS / BOUNCE
1133
1134 ==============================================================================
1135 */
1136
1137 /*
1138 =============
1139 SV_CheckWaterTransition
1140
1141 =============
1142 */
1143 void SV_CheckWaterTransition (edict_t *ent)
1144 {
1145         int cont;
1146         cont = Mod_PointContents(ent->v->origin, sv.worldmodel);
1147         if (!ent->v->watertype)
1148         {
1149                 // just spawned here
1150                 ent->v->watertype = cont;
1151                 ent->v->waterlevel = 1;
1152                 return;
1153         }
1154
1155         if (cont <= CONTENTS_WATER)
1156         {
1157                 if (ent->v->watertype == CONTENTS_EMPTY && cont != CONTENTS_LAVA)
1158                         // just crossed into water
1159                         SV_StartSound (ent, 0, "misc/h2ohit1.wav", 255, 1);
1160
1161                 ent->v->watertype = cont;
1162                 ent->v->waterlevel = 1;
1163         }
1164         else
1165         {
1166                 if (ent->v->watertype != CONTENTS_EMPTY && ent->v->watertype != CONTENTS_LAVA)
1167                         // just crossed into water
1168                         SV_StartSound (ent, 0, "misc/h2ohit1.wav", 255, 1);
1169
1170                 ent->v->watertype = CONTENTS_EMPTY;
1171                 ent->v->waterlevel = cont;
1172         }
1173 }
1174
1175 /*
1176 =============
1177 SV_Physics_Toss
1178
1179 Toss, bounce, and fly movement.  When onground, do nothing.
1180 =============
1181 */
1182 void SV_Physics_Toss (edict_t *ent)
1183 {
1184         trace_t trace;
1185         vec3_t move;
1186         edict_t *groundentity;
1187
1188         // regular thinking
1189         if (!SV_RunThink (ent))
1190                 return;
1191
1192 // if onground, return without moving
1193         if ((int)ent->v->flags & FL_ONGROUND)
1194         {
1195                 VectorClear(ent->v->velocity);
1196                 if (ent->v->groundentity == 0)
1197                         return;
1198                 // if ent was supported by a brush model on previous frame,
1199                 // and groundentity is now freed, set groundentity to 0 (floating)
1200                 groundentity = PROG_TO_EDICT(ent->v->groundentity);
1201                 if (groundentity->v->solid == SOLID_BSP)
1202                 {
1203                         ent->e->suspendedinairflag = true;
1204                         return;
1205                 }
1206                 else if (ent->e->suspendedinairflag && groundentity->e->free)
1207                 {
1208                         // leave it suspended in the air
1209                         ent->v->groundentity = 0;
1210                         ent->e->suspendedinairflag = false;
1211                         return;
1212                 }
1213         }
1214         ent->e->suspendedinairflag = false;
1215
1216         SV_CheckVelocity (ent);
1217
1218 // add gravity
1219         if (ent->v->movetype == MOVETYPE_TOSS || ent->v->movetype == MOVETYPE_BOUNCE)
1220                 SV_AddGravity (ent);
1221
1222 // move angles
1223         VectorMA (ent->v->angles, sv.frametime, ent->v->avelocity, ent->v->angles);
1224
1225 // move origin
1226         VectorScale (ent->v->velocity, sv.frametime, move);
1227         trace = SV_PushEntity (ent, move, vec3_origin);
1228         if (ent->e->free)
1229                 return;
1230
1231         if (trace.fraction < 1)
1232         {
1233                 if (ent->v->movetype == MOVETYPE_BOUNCEMISSILE)
1234                 {
1235                         ClipVelocity (ent->v->velocity, trace.plane.normal, ent->v->velocity, 2.0);
1236                         ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
1237                 }
1238                 else if (ent->v->movetype == MOVETYPE_BOUNCE)
1239                 {
1240                         ClipVelocity (ent->v->velocity, trace.plane.normal, ent->v->velocity, 1.5);
1241                         // LordHavoc: fixed grenades not bouncing when fired down a slope
1242                         if (trace.plane.normal[2] > 0.7 && DotProduct(trace.plane.normal, ent->v->velocity) < 60)
1243                         {
1244                                 ent->v->flags = (int)ent->v->flags | FL_ONGROUND;
1245                                 ent->v->groundentity = EDICT_TO_PROG(trace.ent);
1246                                 VectorClear (ent->v->velocity);
1247                                 VectorClear (ent->v->avelocity);
1248                         }
1249                         else
1250                                 ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
1251                 }
1252                 else
1253                 {
1254                         ClipVelocity (ent->v->velocity, trace.plane.normal, ent->v->velocity, 1.0);
1255                         if (trace.plane.normal[2] > 0.7)
1256                         {
1257                                 ent->v->flags = (int)ent->v->flags | FL_ONGROUND;
1258                                 ent->v->groundentity = EDICT_TO_PROG(trace.ent);
1259                                 VectorClear (ent->v->velocity);
1260                                 VectorClear (ent->v->avelocity);
1261                         }
1262                         else
1263                                 ent->v->flags = (int)ent->v->flags & ~FL_ONGROUND;
1264                 }
1265         }
1266
1267 // check for in water
1268         SV_CheckWaterTransition (ent);
1269 }
1270
1271 /*
1272 ===============================================================================
1273
1274 STEPPING MOVEMENT
1275
1276 ===============================================================================
1277 */
1278
1279 /*
1280 =============
1281 SV_Physics_Step
1282
1283 Monsters freefall when they don't have a ground entity, otherwise
1284 all movement is done with discrete steps.
1285
1286 This is also used for objects that have become still on the ground, but
1287 will fall if the floor is pulled out from under them.
1288 =============
1289 */
1290 void SV_Physics_Step (edict_t *ent)
1291 {
1292         int flags, fall, hitsound;
1293
1294         // freefall if not fly/swim
1295         fall = true;
1296         flags = (int)ent->v->flags;
1297         if (flags & (FL_FLY | FL_SWIM))
1298         {
1299                 if (flags & FL_FLY)
1300                         fall = false;
1301                 else if ((flags & FL_SWIM) && Mod_PointContents(ent->v->origin, sv.worldmodel) != CONTENTS_EMPTY)
1302                         fall = false;
1303         }
1304         if (fall && (flags & FL_ONGROUND) && ent->v->groundentity == 0)
1305                 fall = false;
1306
1307         if (fall)
1308         {
1309                 if (ent->v->velocity[2] < sv_gravity.value*-0.1)
1310                 {
1311                         hitsound = true;
1312                         if (flags & FL_ONGROUND)
1313                                 hitsound = false;
1314                 }
1315                 else
1316                         hitsound = false;
1317
1318                 SV_AddGravity (ent);
1319                 SV_CheckVelocity (ent);
1320                 SV_FlyMove (ent, sv.frametime, NULL);
1321                 SV_LinkEdict (ent, false);
1322
1323                 // just hit ground
1324                 if ((int)ent->v->flags & FL_ONGROUND)
1325                 {
1326                         VectorClear(ent->v->velocity);
1327                         if (hitsound)
1328                                 SV_StartSound (ent, 0, "demon/dland2.wav", 255, 1);
1329                 }
1330         }
1331
1332 // regular thinking
1333         SV_RunThink (ent);
1334
1335         SV_CheckWaterTransition (ent);
1336 }
1337
1338 //============================================================================
1339
1340 /*
1341 ================
1342 SV_Physics
1343
1344 ================
1345 */
1346 void SV_Physics (void)
1347 {
1348         int i;
1349         edict_t *ent;
1350
1351 // let the progs know that a new frame has started
1352         pr_global_struct->self = EDICT_TO_PROG(sv.edicts);
1353         pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
1354         pr_global_struct->time = sv.time;
1355         PR_ExecuteProgram (pr_global_struct->StartFrame, "QC function StartFrame is missing");
1356
1357 //
1358 // treat each object in turn
1359 //
1360         ent = sv.edicts;
1361         for (i=0 ; i<sv.num_edicts ; i++, ent = NEXT_EDICT(ent))
1362         {
1363                 if (ent->e->free)
1364                         continue;
1365
1366                 if (pr_global_struct->force_retouch)
1367                         SV_LinkEdict (ent, true);       // force retouch even for stationary
1368
1369                 if (i > 0 && i <= svs.maxclients)
1370                 {
1371                         if (!svs.clients[i-1].active)
1372                                 continue;
1373                         // connected slot
1374                         // call standard client pre-think
1375                         SV_CheckVelocity (ent);
1376                         pr_global_struct->time = sv.time;
1377                         pr_global_struct->self = EDICT_TO_PROG(ent);
1378                         PR_ExecuteProgram (pr_global_struct->PlayerPreThink, "QC function PlayerPreThink is missing");
1379                         SV_CheckVelocity (ent);
1380                 }
1381
1382                 // LordHavoc: merged client and normal entity physics
1383                 switch ((int) ent->v->movetype)
1384                 {
1385                 case MOVETYPE_PUSH:
1386                         SV_Physics_Pusher (ent);
1387                         break;
1388                 case MOVETYPE_NONE:
1389                         // LordHavoc: manually inlined the thinktime check here because MOVETYPE_NONE is used on so many objects
1390                         if (ent->v->nextthink > 0 && ent->v->nextthink <= sv.time + sv.frametime)
1391                                 SV_RunThink (ent);
1392                         break;
1393                 case MOVETYPE_FOLLOW:
1394                         SV_Physics_Follow (ent);
1395                         break;
1396                 case MOVETYPE_NOCLIP:
1397                         if (i > 0 && i <= svs.maxclients)
1398                         {
1399                                 if (SV_RunThink (ent))
1400                                 {
1401                                         SV_CheckWater (ent);
1402                                         VectorMA (ent->v->origin, sv.frametime, ent->v->velocity, ent->v->origin);
1403                                         VectorMA (ent->v->angles, sv.frametime, ent->v->avelocity, ent->v->angles);
1404                                 }
1405                         }
1406                         else
1407                                 SV_Physics_Noclip (ent);
1408                         break;
1409                 case MOVETYPE_STEP:
1410                         SV_Physics_Step (ent);
1411                         break;
1412                 case MOVETYPE_WALK:
1413                         if (SV_RunThink (ent))
1414                         {
1415                                 if (!SV_CheckWater (ent) && ! ((int)ent->v->flags & FL_WATERJUMP) )
1416                                         SV_AddGravity (ent);
1417                                 SV_CheckStuck (ent);
1418                                 SV_WalkMove (ent);
1419                                 SV_LinkEdict (ent, true);
1420                         }
1421                         break;
1422                 case MOVETYPE_TOSS:
1423                 case MOVETYPE_BOUNCE:
1424                 case MOVETYPE_BOUNCEMISSILE:
1425                 case MOVETYPE_FLYMISSILE:
1426                         SV_Physics_Toss (ent);
1427                         break;
1428                 case MOVETYPE_FLY:
1429                         if (i > 0 && i <= svs.maxclients)
1430                         {
1431                                 if (SV_RunThink (ent))
1432                                 {
1433                                         SV_CheckWater (ent);
1434                                         SV_WalkMove (ent);
1435                                 }
1436                         }
1437                         else
1438                                 SV_Physics_Toss (ent);
1439                         break;
1440                 default:
1441                         Host_Error ("SV_Physics: bad movetype %i", (int)ent->v->movetype);
1442                         break;
1443                 }
1444
1445                 if (i > 0 && i <= svs.maxclients && !ent->e->free)
1446                 {
1447                         SV_CheckVelocity (ent);
1448
1449                         // call standard player post-think
1450                         SV_LinkEdict (ent, true);
1451
1452                         SV_CheckVelocity (ent);
1453
1454                         pr_global_struct->time = sv.time;
1455                         pr_global_struct->self = EDICT_TO_PROG(ent);
1456                         PR_ExecuteProgram (pr_global_struct->PlayerPostThink, "QC function PlayerPostThink is missing");
1457                 }
1458         }
1459
1460         if (pr_global_struct->force_retouch)
1461                 pr_global_struct->force_retouch--;
1462
1463         // LordHavoc: endframe support
1464         if (EndFrameQC)
1465         {
1466                 pr_global_struct->self = EDICT_TO_PROG(sv.edicts);
1467                 pr_global_struct->other = EDICT_TO_PROG(sv.edicts);
1468                 pr_global_struct->time = sv.time;
1469                 PR_ExecuteProgram ((func_t)(EndFrameQC - pr_functions), "");
1470         }
1471
1472         sv.time += sv.frametime;
1473 }
1474
1475
1476 trace_t SV_Trace_Toss (edict_t *tossent, edict_t *ignore)
1477 {
1478         int i;
1479         float gravity, savesolid;
1480         vec3_t move, end;
1481         edict_t tempent, *tent;
1482         entvars_t vars;
1483         eval_t *val;
1484         trace_t trace;
1485
1486         // copy the vars over
1487         memcpy(&vars, tossent->v, sizeof(entvars_t));
1488         // set up the temp entity to point to the copied vars
1489         tent = &tempent;
1490         tent->v = &vars;
1491
1492         savesolid = tossent->v->solid;
1493         tossent->v->solid = SOLID_NOT;
1494
1495         // this has to fetch the field from the original edict, since our copy is truncated
1496         val = GETEDICTFIELDVALUE(tossent, eval_gravity);
1497         if (val != NULL && val->_float != 0)
1498                 gravity = val->_float;
1499         else
1500                 gravity = 1.0;
1501         gravity *= sv_gravity.value * 0.05;
1502
1503         for (i = 0;i < 200;i++) // LordHavoc: sanity check; never trace more than 10 seconds
1504         {
1505                 SV_CheckVelocity (tent);
1506                 tent->v->velocity[2] -= gravity;
1507                 VectorMA (tent->v->angles, 0.05, tent->v->avelocity, tent->v->angles);
1508                 VectorScale (tent->v->velocity, 0.05, move);
1509                 VectorAdd (tent->v->origin, move, end);
1510                 trace = SV_Move (tent->v->origin, tent->v->mins, tent->v->maxs, end, MOVE_NORMAL, tent);
1511                 VectorCopy (trace.endpos, tent->v->origin);
1512
1513                 if (trace.fraction < 1 && trace.ent)
1514                         if (trace.ent != ignore)
1515                                 break;
1516         }
1517         tossent->v->solid = savesolid;
1518         trace.fraction = 0; // not relevant
1519         return trace;
1520 }
1521