/* Emacs style mode select -*- C++ -*- *----------------------------------------------------------------------------- * * * PrBoom a Doom port merged with LxDoom and LSDLDoom * based on BOOM, a modified and improved DOOM engine * Copyright (C) 1999 by * id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman * Copyright (C) 1999-2000 by * Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. * * DESCRIPTION: * Thinker, Ticker. * *-----------------------------------------------------------------------------*/ #include "doomstat.h" #include "p_user.h" #include "p_spec.h" #include "p_tick.h" #include "p_map.h" #include "rockmacros.h" int leveltime; // // THINKERS // All thinkers should be allocated by Z_Malloc // so they can be operated on uniformly. // The actual structures will vary in size, // but the first element must be thinker_t. // // Both the head and tail of the thinker list. thinker_t thinkercap; // killough 8/29/98: we maintain several separate threads, each containing // a special class of thinkers, to allow more efficient searches. thinker_t thinkerclasscap[NUMTHCLASS]; // // P_InitThinkers // void P_InitThinkers(void) { int i; for (i=0; ifunction == P_MobjThinker && ((mobj_t *) thinker)->health > 0 && (((mobj_t *) thinker)->flags & MF_COUNTKILL || ((mobj_t *) thinker)->type == MT_SKULL) ? ((mobj_t *) thinker)->flags & MF_FRIEND ? th_friends : th_enemies : th_misc; // Remove from current thread thinker_t *th = thinker->cnext; (th->cprev = thinker->cprev)->cnext = th; // Add to appropriate thread th = &thinkerclasscap[class]; th->cprev->cnext = thinker; thinker->cnext = th; thinker->cprev = th->cprev; th->cprev = thinker; } // // P_AddThinker // Adds a new thinker at the end of the list. // void P_AddThinker(thinker_t* thinker) { thinkercap.prev->next = thinker; thinker->next = &thinkercap; thinker->prev = thinkercap.prev; thinkercap.prev = thinker; thinker->references = 0; // killough 11/98: init reference counter to 0 // killough 8/29/98: set sentinel pointers, and then add to appropriate list thinker->cnext = thinker->cprev = thinker; P_UpdateThinker(thinker); } // // killough 11/98: // // Make currentthinker external, so that P_RemoveThinkerDelayed // can adjust currentthinker when thinkers self-remove. static thinker_t *currentthinker; // // P_RemoveThinkerDelayed() // // Called automatically as part of the thinker loop in P_RunThinkers(), // on nodes which are pending deletion. // // If this thinker has no more pointers referencing it indirectly, // remove it, and set currentthinker to one node preceeding it, so // that the next step in P_RunThinkers() will get its successor. // void P_RemoveThinkerDelayed(thinker_t *thinker) { if (!thinker->references) { thinker_t *next = thinker->next; (next->prev = currentthinker = thinker->prev)->next = next; Z_Free(thinker); } } // // P_RemoveThinker // // Deallocation is lazy -- it will not actually be freed // until its thinking turn comes up. // // killough 4/25/98: // // Instead of marking the function with -1 value cast to a function pointer, // set the function to P_RemoveThinkerDelayed(), so that later, it will be // removed automatically as part of the thinker process. // void P_RemoveThinker(thinker_t *thinker) { thinker->function = P_RemoveThinkerDelayed; // killough 8/29/98: remove immediately from threaded list (thinker->cnext->cprev = thinker->cprev)->cnext = thinker->cnext; } /* * P_SetTarget * * This function is used to keep track of pointer references to mobj thinkers. * In Doom, objects such as lost souls could sometimes be removed despite * their still being referenced. In Boom, 'target' mobj fields were tested * during each gametic, and any objects pointed to by them would be prevented * from being removed. But this was incomplete, and was slow (every mobj was * checked during every gametic). Now, we keep a count of the number of * references, and delay removal until the count is 0. */ void P_SetTarget(mobj_t **mop, mobj_t *targ) { if (*mop) // If there was a target already, decrease its refcount (*mop)->thinker.references--; if ((*mop = targ)) // Set new target and if non-NULL, increase its counter targ->thinker.references++; } // // P_RunThinkers // // killough 4/25/98: // // Fix deallocator to stop using "next" pointer after node has been freed // (a Doom bug). // // Process each thinker. For thinkers which are marked deleted, we must // load the "next" pointer prior to freeing the node. In Doom, the "next" // pointer was loaded AFTER the thinker was freed, which could have caused // crashes. // // But if we are not deleting the thinker, we should reload the "next" // pointer after calling the function, in case additional thinkers are // added at the end of the list. // // killough 11/98: // // Rewritten to delete nodes implicitly, by making currentthinker // external and using P_RemoveThinkerDelayed() implicitly. // static void P_RunThinkers (void) { for (currentthinker = thinkercap.next; currentthinker != &thinkercap; currentthinker = currentthinker->next) if (currentthinker->function) currentthinker->function(currentthinker); } // // P_Ticker // void P_Ticker (void) { int i; /* pause if in menu and at least one tic has been run * * killough 9/29/98: note that this ties in with basetic, * since G_Ticker does the pausing during recording or * playback, and compenates by incrementing basetic. * * All of this complicated mess is used to preserve demo sync. */ if (paused || (menuactive && !demoplayback && !netgame && players[consoleplayer].viewz != 1)) return; P_MapStart(); // not if this is an intermission screen if(gamestate==GS_LEVEL) for (i=0; i137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763