sv_move.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_move.c -- monster movement
  21
  22 #include "quakedef.h"
  23 #include "prvm_cmds.h"
  24
  25 /*
  26 =============
  27 SV_CheckBottom
  28
  29 Returns false if any part of the bottom of the entity is off an edge that
  30 is not a staircase.
  31
  32 =============
  33 */
  34 int c_yes, c_no;
  35
  36 qbool SV_CheckBottom (prvm_edict_t *ent)
  37 {
  38         prvm_prog_t *prog = SVVM_prog;
  39         vec3_t  mins, maxs, start, stop;
  40         trace_t trace;
  41         int             x, y;
  42         float   mid, bottom;
  43
  44         VectorAdd (PRVM_serveredictvector(ent, origin), PRVM_serveredictvector(ent, mins), mins);
  45         VectorAdd (PRVM_serveredictvector(ent, origin), PRVM_serveredictvector(ent, maxs), maxs);
  46
  47 // if all of the points under the corners are solid world, don't bother
  48 // with the tougher checks
  49 // the corners must be within 16 of the midpoint
  50         start[2] = mins[2] - 1;
  51         for     (x=0 ; x<=1 ; x++)
  52                 for     (y=0 ; y<=1 ; y++)
  53                 {
  54                         start[0] = x ? maxs[0] : mins[0];
  55                         start[1] = y ? maxs[1] : mins[1];
  56                         if (!(SV_PointSuperContents(start) & (SUPERCONTENTS_SOLID | SUPERCONTENTS_BODY)))
  57                                 goto realcheck;
  58                 }
  59
  60         c_yes++;
  61         return true;            // we got out easy
  62
  63 realcheck:
  64         c_no++;
  65 //
  66 // check it for real...
  67 //
  68         start[2] = mins[2];
  69
  70 // the midpoint must be within 16 of the bottom
  71         start[0] = stop[0] = (mins[0] + maxs[0])*0.5;
  72         start[1] = stop[1] = (mins[1] + maxs[1])*0.5;
  73         stop[2] = start[2] - 2*sv_stepheight.value;
  74         trace = SV_TraceLine(start, stop, MOVE_NOMONSTERS, ent, SV_GenericHitSuperContentsMask(ent), 0, 0, collision_extendmovelength.value);
  75
  76         if (trace.fraction == 1.0)
  77                 return false;
  78         mid = bottom = trace.endpos[2];
  79
  80 // the corners must be within 16 of the midpoint
  81         for     (x=0 ; x<=1 ; x++)
  82                 for     (y=0 ; y<=1 ; y++)
  83                 {
  84                         start[0] = stop[0] = x ? maxs[0] : mins[0];
  85                         start[1] = stop[1] = y ? maxs[1] : mins[1];
  86
  87                         trace = SV_TraceLine(start, stop, MOVE_NOMONSTERS, ent, SV_GenericHitSuperContentsMask(ent), 0, 0, collision_extendmovelength.value);
  88
  89                         if (trace.fraction != 1.0 && trace.endpos[2] > bottom)
  90                                 bottom = trace.endpos[2];
  91                         if (trace.fraction == 1.0 || mid - trace.endpos[2] > sv_stepheight.value)
  92                                 return false;
  93                 }
  94
  95         c_yes++;
  96         return true;
  97 }
  98
  99
 100 /*
 101 =============
 102 SV_movestep
 103
 104 Called by monster program code.
 105 The move will be adjusted for slopes and stairs, but if the move isn't
 106 possible, no move is done and false is returned
 107 =============
 108 */
 109 qbool SV_movestep (prvm_edict_t *ent, vec3_t move, qbool relink, qbool noenemy, qbool settrace)
 110 {
 111         prvm_prog_t *prog = SVVM_prog;
 112         float           dz;
 113         vec3_t          oldorg, neworg, end, traceendpos, entorigin, entmins, entmaxs;
 114         trace_t         trace;
 115         int                     i;
 116         prvm_edict_t            *enemy;
 117
 118 // try the move
 119         VectorCopy (PRVM_serveredictvector(ent, origin), oldorg);
 120         VectorAdd (PRVM_serveredictvector(ent, origin), move, neworg);
 121         VectorCopy(PRVM_serveredictvector(ent, mins), entmins);
 122         VectorCopy(PRVM_serveredictvector(ent, maxs), entmaxs);
 123
 124 // flying monsters don't step up
 125         if ( (int)PRVM_serveredictfloat(ent, flags) & (FL_SWIM | FL_FLY) )
 126         {
 127         // try one move with vertical motion, then one without
 128                 for (i=0 ; i<2 ; i++)
 129                 {
 130                         VectorAdd (PRVM_serveredictvector(ent, origin), move, neworg);
 131                         if (noenemy)
 132                                 enemy = prog->edicts;
 133                         else
 134                         {
 135                                 enemy = PRVM_PROG_TO_EDICT(PRVM_serveredictedict(ent, enemy));
 136                                 if (i == 0 && enemy != prog->edicts)
 137                                 {
 138                                         dz = PRVM_serveredictvector(ent, origin)[2] - PRVM_serveredictvector(enemy, origin)[2];
 139                                         if (dz > 40)
 140                                                 neworg[2] -= 8;
 141                                         if (dz < 30)
 142                                                 neworg[2] += 8;
 143                                 }
 144                         }
 145                         VectorCopy(PRVM_serveredictvector(ent, origin), entorigin);
 146                         trace = SV_TraceBox(entorigin, entmins, entmaxs, neworg, MOVE_NORMAL, ent, SV_GenericHitSuperContentsMask(ent), 0, 0, collision_extendmovelength.value);
 147
 148                         if (trace.fraction == 1)
 149                         {
 150                                 VectorCopy(trace.endpos, traceendpos);
 151                                 if (((int)PRVM_serveredictfloat(ent, flags) & FL_SWIM) && !(SV_PointSuperContents(traceendpos) & SUPERCONTENTS_LIQUIDSMASK))
 152                                         return false;   // swim monster left water
 153
 154                                 VectorCopy (traceendpos, PRVM_serveredictvector(ent, origin));
 155                                 if (relink)
 156                                 {
 157                                         SV_LinkEdict(ent);
 158                                         SV_LinkEdict_TouchAreaGrid(ent);
 159                                 }
 160                                 return true;
 161                         }
 162
 163                         if (enemy == prog->edicts)
 164                                 break;
 165                 }
 166
 167                 return false;
 168         }
 169
 170 // push down from a step height above the wished position
 171         neworg[2] += sv_stepheight.value;
 172         VectorCopy (neworg, end);
 173         end[2] -= sv_stepheight.value*2;
 174
 175         trace = SV_TraceBox(neworg, entmins, entmaxs, end, MOVE_NORMAL, ent, SV_GenericHitSuperContentsMask(ent), 0, 0, collision_extendmovelength.value);
 176
 177         if (trace.startsolid)
 178         {
 179                 neworg[2] -= sv_stepheight.value;
 180                 trace = SV_TraceBox(neworg, entmins, entmaxs, end, MOVE_NORMAL, ent, SV_GenericHitSuperContentsMask(ent), 0, 0, collision_extendmovelength.value);
 181                 if (trace.startsolid)
 182                         return false;
 183         }
 184         if (trace.fraction == 1)
 185         {
 186         // if monster had the ground pulled out, go ahead and fall
 187                 if ( (int)PRVM_serveredictfloat(ent, flags) & FL_PARTIALGROUND )
 188                 {
 189                         VectorAdd (PRVM_serveredictvector(ent, origin), move, PRVM_serveredictvector(ent, origin));
 190                         if (relink)
 191                         {
 192                                 SV_LinkEdict(ent);
 193                                 SV_LinkEdict_TouchAreaGrid(ent);
 194                         }
 195                         PRVM_serveredictfloat(ent, flags) = (int)PRVM_serveredictfloat(ent, flags) & ~FL_ONGROUND;
 196                         return true;
 197                 }
 198
 199                 return false;           // walked off an edge
 200         }
 201
 202 // check point traces down for dangling corners
 203         VectorCopy (trace.endpos, PRVM_serveredictvector(ent, origin));
 204
 205         if (!SV_CheckBottom (ent))
 206         {
 207                 if ( (int)PRVM_serveredictfloat(ent, flags) & FL_PARTIALGROUND )
 208                 {       // entity had floor mostly pulled out from underneath it
 209                         // and is trying to correct
 210                         if (relink)
 211                         {
 212                                 SV_LinkEdict(ent);
 213                                 SV_LinkEdict_TouchAreaGrid(ent);
 214                         }
 215                         return true;
 216                 }
 217                 VectorCopy (oldorg, PRVM_serveredictvector(ent, origin));
 218                 return false;
 219         }
 220
 221         if ( (int)PRVM_serveredictfloat(ent, flags) & FL_PARTIALGROUND )
 222                 PRVM_serveredictfloat(ent, flags) = (int)PRVM_serveredictfloat(ent, flags) & ~FL_PARTIALGROUND;
 223
 224 // gameplayfix: check if reached pretty steep plane and bail
 225         if ( ! ( (int)PRVM_serveredictfloat(ent, flags) & (FL_SWIM | FL_FLY) ) && sv_gameplayfix_nostepmoveonsteepslopes.integer )
 226         {
 227                 if (trace.plane.normal[ 2 ] < 0.5)
 228                 {
 229                         VectorCopy (oldorg, PRVM_serveredictvector(ent, origin));
 230                         return false;
 231                 }
 232         }
 233
 234         PRVM_serveredictedict(ent, groundentity) = PRVM_EDICT_TO_PROG(trace.ent);
 235
 236 // the move is ok
 237         if (relink)
 238         {
 239                 SV_LinkEdict(ent);
 240                 SV_LinkEdict_TouchAreaGrid(ent);
 241         }
 242         return true;
 243 }
 244
 245
 246 //============================================================================
 247
 248 /*
 249 ======================
 250 SV_StepDirection
 251
 252 Turns to the movement direction, and walks the current distance if
 253 facing it.
 254
 255 ======================
 256 */
 257 static qbool SV_StepDirection (prvm_edict_t *ent, float yaw, float dist)
 258 {
 259         prvm_prog_t *prog = SVVM_prog;
 260         vec3_t          move, oldorigin;
 261         float           delta;
 262
 263         PRVM_serveredictfloat(ent, ideal_yaw) = yaw;
 264         VM_changeyaw(prog);
 265
 266         yaw = yaw*M_PI*2 / 360;
 267         move[0] = cos(yaw)*dist;
 268         move[1] = sin(yaw)*dist;
 269         move[2] = 0;
 270
 271         VectorCopy (PRVM_serveredictvector(ent, origin), oldorigin);
 272         if (SV_movestep (ent, move, false, false, false))
 273         {
 274                 delta = PRVM_serveredictvector(ent, angles)[YAW] - PRVM_serveredictfloat(ent, ideal_yaw);
 275                 if (delta > 45 && delta < 315)
 276                 {               // not turned far enough, so don't take the step
 277                         VectorCopy (oldorigin, PRVM_serveredictvector(ent, origin));
 278                 }
 279                 SV_LinkEdict(ent);
 280                 SV_LinkEdict_TouchAreaGrid(ent);
 281                 return true;
 282         }
 283         SV_LinkEdict(ent);
 284         SV_LinkEdict_TouchAreaGrid(ent);
 285
 286         return false;
 287 }
 288
 289 /*
 290 ======================
 291 SV_FixCheckBottom
 292
 293 ======================
 294 */
 295 static void SV_FixCheckBottom (prvm_edict_t *ent)
 296 {
 297         prvm_prog_t *prog = SVVM_prog;
 298         PRVM_serveredictfloat(ent, flags) = (int)PRVM_serveredictfloat(ent, flags) | FL_PARTIALGROUND;
 299 }
 300
 301
 302
 303 /*
 304 ================
 305 SV_NewChaseDir
 306
 307 ================
 308 */
 309 #define DI_NODIR        -1
 310 static void SV_NewChaseDir (prvm_edict_t *actor, prvm_edict_t *enemy, float dist)
 311 {
 312         prvm_prog_t *prog = SVVM_prog;
 313         float           deltax,deltay;
 314         float                   d[3];
 315         float           tdir, olddir, turnaround;
 316
 317         olddir = ANGLEMOD((int)(PRVM_serveredictfloat(actor, ideal_yaw)/45)*45);
 318         turnaround = ANGLEMOD(olddir - 180);
 319
 320         deltax = PRVM_serveredictvector(enemy, origin)[0] - PRVM_serveredictvector(actor, origin)[0];
 321         deltay = PRVM_serveredictvector(enemy, origin)[1] - PRVM_serveredictvector(actor, origin)[1];
 322         if (deltax>10)
 323                 d[1]= 0;
 324         else if (deltax<-10)
 325                 d[1]= 180;
 326         else
 327                 d[1]= DI_NODIR;
 328         if (deltay<-10)
 329                 d[2]= 270;
 330         else if (deltay>10)
 331                 d[2]= 90;
 332         else
 333                 d[2]= DI_NODIR;
 334
 335 // try direct route
 336         if (d[1] != DI_NODIR && d[2] != DI_NODIR)
 337         {
 338                 if (d[1] == 0)
 339                         tdir = d[2] == 90 ? 45 : 315;
 340                 else
 341                         tdir = d[2] == 90 ? 135 : 215;
 342
 343                 if (tdir != turnaround && SV_StepDirection(actor, tdir, dist))
 344                         return;
 345         }
 346
 347 // try other directions
 348         if ( ((rand()&3) & 1) ||  fabs(deltay)>fabs(deltax))
 349         {
 350                 tdir=d[1];
 351                 d[1]=d[2];
 352                 d[2]=tdir;
 353         }
 354
 355         if (d[1]!=DI_NODIR && d[1]!=turnaround
 356         && SV_StepDirection(actor, d[1], dist))
 357                         return;
 358
 359         if (d[2]!=DI_NODIR && d[2]!=turnaround
 360         && SV_StepDirection(actor, d[2], dist))
 361                         return;
 362
 363 /* there is no direct path to the player, so pick another direction */
 364
 365         if (olddir!=DI_NODIR && SV_StepDirection(actor, olddir, dist))
 366                         return;
 367
 368         if (rand()&1)   /*randomly determine direction of search*/
 369         {
 370                 for (tdir=0 ; tdir<=315 ; tdir += 45)
 371                         if (tdir!=turnaround && SV_StepDirection(actor, tdir, dist) )
 372                                         return;
 373         }
 374         else
 375         {
 376                 for (tdir=315 ; tdir >=0 ; tdir -= 45)
 377                         if (tdir!=turnaround && SV_StepDirection(actor, tdir, dist) )
 378                                         return;
 379         }
 380
 381         if (turnaround != DI_NODIR && SV_StepDirection(actor, turnaround, dist) )
 382                         return;
 383
 384         PRVM_serveredictfloat(actor, ideal_yaw) = olddir;               // can't move
 385
 386 // if a bridge was pulled out from underneath a monster, it may not have
 387 // a valid standing position at all
 388
 389         if (!SV_CheckBottom (actor))
 390                 SV_FixCheckBottom (actor);
 391
 392 }
 393
 394 /*
 395 ======================
 396 SV_CloseEnough
 397
 398 ======================
 399 */
 400 static qbool SV_CloseEnough (prvm_edict_t *ent, prvm_edict_t *goal, float dist)
 401 {
 402         int             i;
 403
 404         for (i=0 ; i<3 ; i++)
 405         {
 406                 if (goal->priv.server->areamins[i] > ent->priv.server->areamaxs[i] + dist)
 407                         return false;
 408                 if (goal->priv.server->areamaxs[i] < ent->priv.server->areamins[i] - dist)
 409                         return false;
 410         }
 411         return true;
 412 }
 413
 414 /*
 415 ======================
 416 VM_SV_MoveToGoal
 417
 418 ======================
 419 */
 420 void VM_SV_MoveToGoal(prvm_prog_t *prog)
 421 {
 422         prvm_edict_t            *ent, *goal;
 423         float           dist;
 424
 425         VM_SAFEPARMCOUNT(1, VM_SV_MoveToGoal);
 426
 427         ent = PRVM_PROG_TO_EDICT(PRVM_serverglobaledict(self));
 428         goal = PRVM_PROG_TO_EDICT(PRVM_serveredictedict(ent, goalentity));
 429         dist = PRVM_G_FLOAT(OFS_PARM0);
 430
 431         if ( !( (int)PRVM_serveredictfloat(ent, flags) & (FL_ONGROUND|FL_FLY|FL_SWIM) ) )
 432         {
 433                 PRVM_G_FLOAT(OFS_RETURN) = 0;
 434                 return;
 435         }
 436
 437 // if the next step hits the enemy, return immediately
 438         if ( PRVM_PROG_TO_EDICT(PRVM_serveredictedict(ent, enemy)) != prog->edicts &&  SV_CloseEnough (ent, goal, dist) )
 439                 return;
 440
 441 // bump around...
 442         if ( (rand()&3)==1 ||
 443         !SV_StepDirection (ent, PRVM_serveredictfloat(ent, ideal_yaw), dist))
 444         {
 445                 SV_NewChaseDir (ent, goal, dist);
 446         }
 447 }
 448