src/dungeongen.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "dungeongen.h"
  21 #include "mapgen.h"
  22 #include "voxel.h"
  23 #include "noise.h"
  24 #include "mapblock.h"
  25 #include "mapnode.h"
  26 #include "map.h"
  27 #include "nodedef.h"
  28 #include "profiler.h"
  29 #include "settings.h" // For g_settings
  30 #include "main.h" // For g_profiler
  31
  32 //#define DGEN_USE_TORCHES
  33
  34 NoiseParams nparams_dungeon_rarity =
  35         {0.0, 1.0, v3f(500.0, 500.0, 500.0), 0, 2, 0.8};
  36 NoiseParams nparams_dungeon_wetness =
  37         {0.0, 1.0, v3f(40.0, 40.0, 40.0), 32474, 4, 1.1};
  38 NoiseParams nparams_dungeon_density =
  39         {0.0, 1.0, v3f(2.5, 2.5, 2.5), 0, 2, 1.4};
  40
  41
  42 ///////////////////////////////////////////////////////////////////////////////
  43
  44
  45 DungeonGen::DungeonGen(Mapgen *mapgen, DungeonParams *dparams) {
  46         this->mg = mapgen;
  47         this->vm = mapgen->vm;
  48
  49 #ifdef DGEN_USE_TORCHES
  50         c_torch  = ndef->getId("default:torch");
  51 #endif
  52
  53         if (dparams) {
  54                 memcpy(&dp, dparams, sizeof(dp));
  55         } else {
  56                 dp.c_water  = mg->ndef->getId("mapgen_water_source");
  57                 dp.c_cobble = mg->ndef->getId("mapgen_cobble");
  58                 dp.c_moss   = mg->ndef->getId("mapgen_mossycobble");
  59                 dp.c_stair  = mg->ndef->getId("mapgen_stair_cobble");
  60
  61                 dp.diagonal_dirs = false;
  62                 dp.mossratio  = 3.0;
  63                 dp.holesize   = v3s16(1, 2, 1);
  64                 dp.roomsize   = v3s16(0,0,0);
  65                 dp.notifytype = GENNOTIFY_DUNGEON;
  66
  67                 dp.np_rarity  = nparams_dungeon_rarity;
  68                 dp.np_wetness = nparams_dungeon_wetness;
  69                 dp.np_density = nparams_dungeon_density;
  70         }
  71 }
  72
  73
  74 void DungeonGen::generate(u32 bseed, v3s16 nmin, v3s16 nmax) {
  75         //TimeTaker t("gen dungeons");
  76         int approx_groundlevel = 10 + mg->water_level;
  77
  78         if ((nmin.Y + nmax.Y) / 2 >= approx_groundlevel ||
  79                 NoisePerlin3D(&dp.np_rarity, nmin.X, nmin.Y, nmin.Z, mg->seed) < 0.2)
  80                 return;
  81
  82         this->blockseed = bseed;
  83         random.seed(bseed + 2);
  84
  85         // Dungeon generator doesn't modify places which have this set
  86         vm->clearFlag(VMANIP_FLAG_DUNGEON_INSIDE | VMANIP_FLAG_DUNGEON_PRESERVE);
  87
  88         // Set all air and water to be untouchable to make dungeons open
  89         // to caves and open air
  90         for (s16 z = nmin.Z; z <= nmax.Z; z++) {
  91                 for (s16 y = nmin.Y; y <= nmax.Y; y++) {
  92                         u32 i = vm->m_area.index(nmin.X, y, z);
  93                         for (s16 x = nmin.X; x <= nmax.X; x++) {
  94                                 content_t c = vm->m_data[i].getContent();
  95                                 if (c == CONTENT_AIR || c == dp.c_water)
  96                                         vm->m_flags[i] |= VMANIP_FLAG_DUNGEON_PRESERVE;
  97                                 i++;
  98                         }
  99                 }
 100         }
 101
 102         // Add it
 103         makeDungeon(v3s16(1,1,1) * MAP_BLOCKSIZE);
 104
 105         // Convert some cobble to mossy cobble
 106         if (dp.mossratio != 0.0) {
 107                 for (s16 z = nmin.Z; z <= nmax.Z; z++)
 108                 for (s16 y = nmin.Y; y <= nmax.Y; y++) {
 109                         u32 i = vm->m_area.index(nmin.X, y, z);
 110                         for (s16 x = nmin.X; x <= nmax.X; x++) {
 111                                 if (vm->m_data[i].getContent() == dp.c_cobble) {
 112                                         float wetness = NoisePerlin3D(&dp.np_wetness, x, y, z, mg->seed);
 113                                         float density = NoisePerlin3D(&dp.np_density, x, y, z, blockseed);
 114                                         if (density < wetness / dp.mossratio)
 115                                                 vm->m_data[i].setContent(dp.c_moss);
 116                                 }
 117                                 i++;
 118                         }
 119                 }
 120         }
 121
 122         //printf("== gen dungeons: %dms\n", t.stop());
 123 }
 124
 125
 126 void DungeonGen::makeDungeon(v3s16 start_padding)
 127 {
 128         v3s16 areasize = vm->m_area.getExtent();
 129         v3s16 roomsize;
 130         v3s16 roomplace;
 131
 132         /*
 133                 Find place for first room
 134         */
 135         bool fits = false;
 136         for (u32 i = 0; i < 100 && !fits; i++)
 137         {
 138                 bool is_large_room = ((random.next() & 3) == 1);
 139                 roomsize = is_large_room ?
 140                         v3s16(random.range(8, 16),random.range(8, 16),random.range(8, 16)) :
 141                         v3s16(random.range(4,  8),random.range(4,  6),random.range(4, 8));
 142                 roomsize += dp.roomsize;
 143
 144                 // start_padding is used to disallow starting the generation of
 145                 // a dungeon in a neighboring generation chunk
 146                 roomplace = vm->m_area.MinEdge + start_padding + v3s16(
 147                         random.range(0,areasize.X-roomsize.X-1-start_padding.X),
 148                         random.range(0,areasize.Y-roomsize.Y-1-start_padding.Y),
 149                         random.range(0,areasize.Z-roomsize.Z-1-start_padding.Z));
 150
 151                 /*
 152                         Check that we're not putting the room to an unknown place,
 153                         otherwise it might end up floating in the air
 154                 */
 155                 fits = true;
 156                 for (s16 z = 1; z < roomsize.Z - 1; z++)
 157                 for (s16 y = 1; y < roomsize.Y - 1; y++)
 158                 for (s16 x = 1; x < roomsize.X - 1; x++)
 159                 {
 160                         v3s16 p = roomplace + v3s16(x, y, z);
 161                         u32 vi = vm->m_area.index(p);
 162                         if ((vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_INSIDE) ||
 163                                 vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 164                                 fits = false;
 165                                 break;
 166                         }
 167                 }
 168         }
 169         // No place found
 170         if (fits == false)
 171                 return;
 172
 173         /*
 174                 Stores the center position of the last room made, so that
 175                 a new corridor can be started from the last room instead of
 176                 the new room, if chosen so.
 177         */
 178         v3s16 last_room_center = roomplace + v3s16(roomsize.X / 2, 1, roomsize.Z / 2);
 179
 180         u32 room_count = random.range(2, 16);
 181         for (u32 i = 0; i < room_count; i++)
 182         {
 183                 // Make a room to the determined place
 184                 makeRoom(roomsize, roomplace);
 185
 186                 v3s16 room_center = roomplace + v3s16(roomsize.X / 2, 1, roomsize.Z / 2);
 187                 if (mg->gennotify & (1 << dp.notifytype)) {
 188                         std::vector <v3s16> *nvec = mg->gen_notifications[dp.notifytype];
 189                         nvec->push_back(room_center);
 190                 }
 191
 192 #ifdef DGEN_USE_TORCHES
 193                 // Place torch at room center (for testing)
 194                 vm->m_data[vm->m_area.index(room_center)] = MapNode(c_torch);
 195 #endif
 196
 197                 // Quit if last room
 198                 if (i == room_count - 1)
 199                         break;
 200
 201                 // Determine walker start position
 202
 203                 bool start_in_last_room = (random.range(0, 2) != 0);
 204
 205                 v3s16 walker_start_place;
 206
 207                 if (start_in_last_room) {
 208                         walker_start_place = last_room_center;
 209                 } else {
 210                         walker_start_place = room_center;
 211                         // Store center of current room as the last one
 212                         last_room_center = room_center;
 213                 }
 214
 215                 // Create walker and find a place for a door
 216                 v3s16 doorplace;
 217                 v3s16 doordir;
 218
 219                 m_pos = walker_start_place;
 220                 if (!findPlaceForDoor(doorplace, doordir))
 221                         return;
 222
 223                 if (random.range(0,1) == 0)
 224                         // Make the door
 225                         makeDoor(doorplace, doordir);
 226                 else
 227                         // Don't actually make a door
 228                         doorplace -= doordir;
 229
 230                 // Make a random corridor starting from the door
 231                 v3s16 corridor_end;
 232                 v3s16 corridor_end_dir;
 233                 makeCorridor(doorplace, doordir, corridor_end, corridor_end_dir);
 234
 235                 // Find a place for a random sized room
 236                 roomsize = v3s16(random.range(4,8),random.range(4,6),random.range(4,8));
 237                 roomsize += dp.roomsize;
 238
 239                 m_pos = corridor_end;
 240                 m_dir = corridor_end_dir;
 241                 if (!findPlaceForRoomDoor(roomsize, doorplace, doordir, roomplace))
 242                         return;
 243
 244                 if (random.range(0,1) == 0)
 245                         // Make the door
 246                         makeDoor(doorplace, doordir);
 247                 else
 248                         // Don't actually make a door
 249                         roomplace -= doordir;
 250
 251         }
 252 }
 253
 254
 255 void DungeonGen::makeRoom(v3s16 roomsize, v3s16 roomplace)
 256 {
 257         MapNode n_cobble(dp.c_cobble);
 258         MapNode n_air(CONTENT_AIR);
 259
 260         // Make +-X walls
 261         for (s16 z = 0; z < roomsize.Z; z++)
 262         for (s16 y = 0; y < roomsize.Y; y++)
 263         {
 264                 {
 265                         v3s16 p = roomplace + v3s16(0, y, z);
 266                         if (vm->m_area.contains(p) == false)
 267                                 continue;
 268                         u32 vi = vm->m_area.index(p);
 269                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 270                                 continue;
 271                         vm->m_data[vi] = n_cobble;
 272                 }
 273                 {
 274                         v3s16 p = roomplace + v3s16(roomsize.X - 1, y, z);
 275                         if (vm->m_area.contains(p) == false)
 276                                 continue;
 277                         u32 vi = vm->m_area.index(p);
 278                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 279                                 continue;
 280                         vm->m_data[vi] = n_cobble;
 281                 }
 282         }
 283
 284         // Make +-Z walls
 285         for (s16 x = 0; x < roomsize.X; x++)
 286         for (s16 y = 0; y < roomsize.Y; y++)
 287         {
 288                 {
 289                         v3s16 p = roomplace + v3s16(x, y, 0);
 290                         if (vm->m_area.contains(p) == false)
 291                                 continue;
 292                         u32 vi = vm->m_area.index(p);
 293                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 294                                 continue;
 295                         vm->m_data[vi] = n_cobble;
 296                 }
 297                 {
 298                         v3s16 p = roomplace + v3s16(x, y, roomsize.Z - 1);
 299                         if (vm->m_area.contains(p) == false)
 300                                 continue;
 301                         u32 vi = vm->m_area.index(p);
 302                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 303                                 continue;
 304                         vm->m_data[vi] = n_cobble;
 305                 }
 306         }
 307
 308         // Make +-Y walls (floor and ceiling)
 309         for (s16 z = 0; z < roomsize.Z; z++)
 310         for (s16 x = 0; x < roomsize.X; x++)
 311         {
 312                 {
 313                         v3s16 p = roomplace + v3s16(x, 0, z);
 314                         if (vm->m_area.contains(p) == false)
 315                                 continue;
 316                         u32 vi = vm->m_area.index(p);
 317                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 318                                 continue;
 319                         vm->m_data[vi] = n_cobble;
 320                 }
 321                 {
 322                         v3s16 p = roomplace + v3s16(x,roomsize. Y - 1, z);
 323                         if (vm->m_area.contains(p) == false)
 324                                 continue;
 325                         u32 vi = vm->m_area.index(p);
 326                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 327                                 continue;
 328                         vm->m_data[vi] = n_cobble;
 329                 }
 330         }
 331
 332         // Fill with air
 333         for (s16 z = 1; z < roomsize.Z - 1; z++)
 334         for (s16 y = 1; y < roomsize.Y - 1; y++)
 335         for (s16 x = 1; x < roomsize.X - 1; x++)
 336         {
 337                 v3s16 p = roomplace + v3s16(x, y, z);
 338                 if (vm->m_area.contains(p) == false)
 339                         continue;
 340                 u32 vi = vm->m_area.index(p);
 341                 vm->m_flags[vi] |= VMANIP_FLAG_DUNGEON_UNTOUCHABLE;
 342                 vm->m_data[vi]   = n_air;
 343         }
 344 }
 345
 346
 347 void DungeonGen::makeFill(v3s16 place, v3s16 size,
 348                 u8 avoid_flags, MapNode n, u8 or_flags)
 349 {
 350         for (s16 z = 0; z < size.Z; z++)
 351         for (s16 y = 0; y < size.Y; y++)
 352         for (s16 x = 0; x < size.X; x++)
 353         {
 354                 v3s16 p = place + v3s16(x, y, z);
 355                 if (vm->m_area.contains(p) == false)
 356                         continue;
 357                 u32 vi = vm->m_area.index(p);
 358                 if (vm->m_flags[vi] & avoid_flags)
 359                         continue;
 360                 vm->m_flags[vi] |= or_flags;
 361                 vm->m_data[vi]   = n;
 362         }
 363 }
 364
 365
 366 void DungeonGen::makeHole(v3s16 place)
 367 {
 368         makeFill(place, dp.holesize, 0,
 369                 MapNode(CONTENT_AIR), VMANIP_FLAG_DUNGEON_INSIDE);
 370 }
 371
 372
 373 void DungeonGen::makeDoor(v3s16 doorplace, v3s16 doordir)
 374 {
 375         makeHole(doorplace);
 376
 377 #ifdef DGEN_USE_TORCHES
 378         // Place torch (for testing)
 379         vm->m_data[vm->m_area.index(doorplace)] = MapNode(c_torch);
 380 #endif
 381 }
 382
 383
 384 void DungeonGen::makeCorridor(v3s16 doorplace,
 385                 v3s16 doordir, v3s16 &result_place, v3s16 &result_dir)
 386 {
 387         makeHole(doorplace);
 388         v3s16 p0 = doorplace;
 389         v3s16 dir = doordir;
 390         u32 length;
 391         /*if (random.next() % 2)
 392                 length = random.range(1, 13);
 393         else
 394                 length = random.range(1, 6);*/
 395         length = random.range(1, 13);
 396         u32 partlength = random.range(1, 13);
 397         u32 partcount = 0;
 398         s16 make_stairs = 0;
 399
 400         if (random.next() % 2 == 0 && partlength >= 3)
 401                 make_stairs = random.next() % 2 ? 1 : -1;
 402
 403         for (u32 i = 0; i < length; i++) {
 404                 v3s16 p = p0 + dir;
 405                 if (partcount != 0)
 406                         p.Y += make_stairs;
 407
 408                 if (vm->m_area.contains(p) == true &&
 409                         vm->m_area.contains(p + v3s16(0, 1, 0)) == true) {
 410                         if (make_stairs) {
 411                                 makeFill(p + v3s16(-1, -1, -1), dp.holesize + v3s16(2, 3, 2),
 412                                                 VMANIP_FLAG_DUNGEON_UNTOUCHABLE, MapNode(dp.c_cobble), 0);
 413                                 makeHole(p);
 414                                 makeHole(p - dir);
 415
 416                                 // TODO: fix stairs code so it works 100% (quite difficult)
 417
 418                                 // exclude stairs from the bottom step
 419                                 // exclude stairs from diagonal steps
 420                                 if (((dir.X ^ dir.Z) & 1) &&
 421                                         (((make_stairs ==  1) && i != 0) ||
 422                                         ((make_stairs == -1) && i != length - 1))) {
 423                                         // rotate face 180 deg if making stairs backwards
 424                                         int facedir = dir_to_facedir(dir * make_stairs);
 425
 426                                         u32 vi = vm->m_area.index(p.X - dir.X, p.Y - 1, p.Z - dir.Z);
 427                                         if (vm->m_data[vi].getContent() == dp.c_cobble)
 428                                                 vm->m_data[vi] = MapNode(dp.c_stair, 0, facedir);
 429
 430                                         vi = vm->m_area.index(p.X, p.Y, p.Z);
 431                                         if (vm->m_data[vi].getContent() == dp.c_cobble)
 432                                                 vm->m_data[vi] = MapNode(dp.c_stair, 0, facedir);
 433                                 }
 434                         } else {
 435                                 makeFill(p + v3s16(-1, -1, -1), dp.holesize + v3s16(2, 2, 2),
 436                                                 VMANIP_FLAG_DUNGEON_UNTOUCHABLE, MapNode(dp.c_cobble), 0);
 437                                 makeHole(p);
 438                         }
 439
 440                         p0 = p;
 441                 } else {
 442                         // Can't go here, turn away
 443                         dir = turn_xz(dir, random.range(0, 1));
 444                         make_stairs = -make_stairs;
 445                         partcount = 0;
 446                         partlength = random.range(1, length);
 447                         continue;
 448                 }
 449
 450                 partcount++;
 451                 if (partcount >= partlength) {
 452                         partcount = 0;
 453
 454                         dir = random_turn(random, dir);
 455
 456                         partlength = random.range(1,length);
 457
 458                         make_stairs = 0;
 459                         if (random.next() % 2 == 0 && partlength >= 3)
 460                                 make_stairs = random.next() % 2 ? 1 : -1;
 461                 }
 462         }
 463         result_place = p0;
 464         result_dir = dir;
 465 }
 466
 467
 468 bool DungeonGen::findPlaceForDoor(v3s16 &result_place, v3s16 &result_dir)
 469 {
 470         for (u32 i = 0; i < 100; i++)
 471         {
 472                 v3s16 p = m_pos + m_dir;
 473                 v3s16 p1 = p + v3s16(0, 1, 0);
 474                 if (vm->m_area.contains(p) == false
 475                  || vm->m_area.contains(p1) == false
 476                  || i % 4 == 0)
 477                 {
 478                         randomizeDir();
 479                         continue;
 480                 }
 481                 if (vm->getNodeNoExNoEmerge(p).getContent()  == dp.c_cobble
 482                  && vm->getNodeNoExNoEmerge(p1).getContent() == dp.c_cobble)
 483                 {
 484                         // Found wall, this is a good place!
 485                         result_place = p;
 486                         result_dir = m_dir;
 487                         // Randomize next direction
 488                         randomizeDir();
 489                         return true;
 490                 }
 491                 /*
 492                         Determine where to move next
 493                 */
 494                 // Jump one up if the actual space is there
 495                 if (vm->getNodeNoExNoEmerge(p+v3s16(0,0,0)).getContent() == dp.c_cobble
 496                  && vm->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() == CONTENT_AIR
 497                  && vm->getNodeNoExNoEmerge(p+v3s16(0,2,0)).getContent() == CONTENT_AIR)
 498                         p += v3s16(0,1,0);
 499                 // Jump one down if the actual space is there
 500                 if (vm->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() == dp.c_cobble
 501                  && vm->getNodeNoExNoEmerge(p+v3s16(0,0,0)).getContent() == CONTENT_AIR
 502                  && vm->getNodeNoExNoEmerge(p+v3s16(0,-1,0)).getContent() == CONTENT_AIR)
 503                         p += v3s16(0,-1,0);
 504                 // Check if walking is now possible
 505                 if (vm->getNodeNoExNoEmerge(p).getContent() != CONTENT_AIR
 506                  || vm->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() != CONTENT_AIR)
 507                 {
 508                         // Cannot continue walking here
 509                         randomizeDir();
 510                         continue;
 511                 }
 512                 // Move there
 513                 m_pos = p;
 514         }
 515         return false;
 516 }
 517
 518
 519 bool DungeonGen::findPlaceForRoomDoor(v3s16 roomsize, v3s16 &result_doorplace,
 520                 v3s16 &result_doordir, v3s16 &result_roomplace)
 521 {
 522         for (s16 trycount = 0; trycount < 30; trycount++)
 523         {
 524                 v3s16 doorplace;
 525                 v3s16 doordir;
 526                 bool r = findPlaceForDoor(doorplace, doordir);
 527                 if (r == false)
 528                         continue;
 529                 v3s16 roomplace;
 530                 // X east, Z north, Y up
 531 #if 1
 532                 if (doordir == v3s16(1, 0, 0)) // X+
 533                         roomplace = doorplace +
 534                                         v3s16(0, -1, random.range(-roomsize.Z + 2, -2));
 535                 if (doordir == v3s16(-1, 0, 0)) // X-
 536                         roomplace = doorplace +
 537                                         v3s16(-roomsize.X + 1, -1, random.range(-roomsize.Z + 2, -2));
 538                 if (doordir == v3s16(0, 0, 1)) // Z+
 539                         roomplace = doorplace +
 540                                         v3s16(random.range(-roomsize.X + 2, -2), -1, 0);
 541                 if (doordir == v3s16(0, 0, -1)) // Z-
 542                         roomplace = doorplace +
 543                                         v3s16(random.range(-roomsize.X + 2, -2), -1, -roomsize.Z + 1);
 544 #endif
 545 #if 0
 546                 if (doordir == v3s16(1, 0, 0)) // X+
 547                         roomplace = doorplace + v3s16(0, -1, -roomsize.Z / 2);
 548                 if (doordir == v3s16(-1, 0, 0)) // X-
 549                         roomplace = doorplace + v3s16(-roomsize.X+1,-1,-roomsize.Z / 2);
 550                 if (doordir == v3s16(0, 0, 1)) // Z+
 551                         roomplace = doorplace + v3s16(-roomsize.X / 2, -1, 0);
 552                 if (doordir == v3s16(0, 0, -1)) // Z-
 553                         roomplace = doorplace + v3s16(-roomsize.X / 2, -1, -roomsize.Z + 1);
 554 #endif
 555
 556                 // Check fit
 557                 bool fits = true;
 558                 for (s16 z = 1; z < roomsize.Z - 1; z++)
 559                 for (s16 y = 1; y < roomsize.Y - 1; y++)
 560                 for (s16 x = 1; x < roomsize.X - 1; x++)
 561                 {
 562                         v3s16 p = roomplace + v3s16(x, y, z);
 563                         if (vm->m_area.contains(p) == false)
 564                         {
 565                                 fits = false;
 566                                 break;
 567                         }
 568                         if (vm->m_flags[vm->m_area.index(p)]
 569                                         & VMANIP_FLAG_DUNGEON_INSIDE)
 570                         {
 571                                 fits = false;
 572                                 break;
 573                         }
 574                 }
 575                 if(fits == false)
 576                 {
 577                         // Find new place
 578                         continue;
 579                 }
 580                 result_doorplace = doorplace;
 581                 result_doordir   = doordir;
 582                 result_roomplace = roomplace;
 583                 return true;
 584         }
 585         return false;
 586 }
 587
 588
 589 v3s16 rand_ortho_dir(PseudoRandom &random, bool diagonal_dirs)
 590 {
 591         // Make diagonal directions somewhat rare
 592         if (diagonal_dirs && (random.next() % 4 == 0)) {
 593                 v3s16 dir;
 594                 int trycount = 0;
 595
 596                 do {
 597                         trycount++;
 598                         dir = v3s16(random.next() % 3 - 1, 0, random.next() % 3 - 1);
 599                 } while ((dir.X == 0 && dir.Z == 0) && trycount < 10);
 600
 601                 return dir;
 602         } else {
 603                 if (random.next() % 2 == 0)
 604                         return random.next() % 2 ? v3s16(-1, 0, 0) : v3s16(1, 0, 0);
 605                 else
 606                         return random.next() % 2 ? v3s16(0, 0, -1) : v3s16(0, 0, 1);
 607         }
 608 }
 609
 610
 611 v3s16 turn_xz(v3s16 olddir, int t)
 612 {
 613         v3s16 dir;
 614         if (t == 0)
 615         {
 616                 // Turn right
 617                 dir.X = olddir.Z;
 618                 dir.Z = -olddir.X;
 619                 dir.Y = olddir.Y;
 620         }
 621         else
 622         {
 623                 // Turn left
 624                 dir.X = -olddir.Z;
 625                 dir.Z = olddir.X;
 626                 dir.Y = olddir.Y;
 627         }
 628         return dir;
 629 }
 630
 631
 632 v3s16 random_turn(PseudoRandom &random, v3s16 olddir)
 633 {
 634         int turn = random.range(0, 2);
 635         v3s16 dir;
 636         if (turn == 0)
 637         {
 638                 // Go straight
 639                 dir = olddir;
 640         }
 641         else if (turn == 1)
 642                 // Turn right
 643                 dir = turn_xz(olddir, 0);
 644         else
 645                 // Turn left
 646                 dir = turn_xz(olddir, 1);
 647         return dir;
 648 }
 649
 650
 651 int dir_to_facedir(v3s16 d) {
 652         if (abs(d.X) > abs(d.Z))
 653                 return d.X < 0 ? 3 : 1;
 654         else
 655                 return d.Z < 0 ? 2 : 0;
 656 }