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(0.0, 1.0, v3f(500.0, 500.0, 500.0), 0, 2, 0.8, 2.0);
  35 NoiseParams nparams_dungeon_wetness(0.0, 1.0, v3f(40.0, 40.0, 40.0), 32474, 4, 1.1, 2.0);
  36 NoiseParams nparams_dungeon_density(0.0, 1.0, v3f(2.5, 2.5, 2.5), 0, 2, 1.4, 2.0);
  37
  38
  39 ///////////////////////////////////////////////////////////////////////////////
  40
  41
  42 DungeonGen::DungeonGen(Mapgen *mapgen, DungeonParams *dparams) {
  43         this->mg = mapgen;
  44         this->vm = mapgen->vm;
  45
  46 #ifdef DGEN_USE_TORCHES
  47         c_torch  = ndef->getId("default:torch");
  48 #endif
  49
  50         if (dparams) {
  51                 memcpy(&dp, dparams, sizeof(dp));
  52         } else {
  53                 dp.c_water  = mg->ndef->getId("mapgen_water_source");
  54                 dp.c_cobble = mg->ndef->getId("mapgen_cobble");
  55                 dp.c_moss   = mg->ndef->getId("mapgen_mossycobble");
  56                 dp.c_stair  = mg->ndef->getId("mapgen_stair_cobble");
  57
  58                 dp.diagonal_dirs = false;
  59                 dp.mossratio  = 3.0;
  60                 dp.holesize   = v3s16(1, 2, 1);
  61                 dp.roomsize   = v3s16(0,0,0);
  62                 dp.notifytype = GENNOTIFY_DUNGEON;
  63
  64                 dp.np_rarity  = nparams_dungeon_rarity;
  65                 dp.np_wetness = nparams_dungeon_wetness;
  66                 dp.np_density = nparams_dungeon_density;
  67         }
  68 }
  69
  70
  71 void DungeonGen::generate(u32 bseed, v3s16 nmin, v3s16 nmax) {
  72         //TimeTaker t("gen dungeons");
  73         if (NoisePerlin3D(&dp.np_rarity, nmin.X, nmin.Y, nmin.Z, mg->seed) < 0.2)
  74                 return;
  75
  76         this->blockseed = bseed;
  77         random.seed(bseed + 2);
  78
  79         // Dungeon generator doesn't modify places which have this set
  80         vm->clearFlag(VMANIP_FLAG_DUNGEON_INSIDE | VMANIP_FLAG_DUNGEON_PRESERVE);
  81
  82         bool no_float = !g_settings->getBool("enable_floating_dungeons");
  83
  84         // Set all air and water (and optionally ignore) to be untouchable
  85         // to make dungeons open to caves and open air
  86         for (s16 z = nmin.Z; z <= nmax.Z; z++) {
  87                 for (s16 y = nmin.Y; y <= nmax.Y; y++) {
  88                         u32 i = vm->m_area.index(nmin.X, y, z);
  89                         for (s16 x = nmin.X; x <= nmax.X; x++) {
  90                                 content_t c = vm->m_data[i].getContent();
  91                                 if (c == CONTENT_AIR || c == dp.c_water
  92                                                 || (no_float && c == CONTENT_IGNORE))
  93                                         vm->m_flags[i] |= VMANIP_FLAG_DUNGEON_PRESERVE;
  94                                 i++;
  95                         }
  96                 }
  97         }
  98
  99         // Add it
 100         makeDungeon(v3s16(1,1,1) * MAP_BLOCKSIZE);
 101
 102         // Convert some cobble to mossy cobble
 103         if (dp.mossratio != 0.0) {
 104                 for (s16 z = nmin.Z; z <= nmax.Z; z++)
 105                 for (s16 y = nmin.Y; y <= nmax.Y; y++) {
 106                         u32 i = vm->m_area.index(nmin.X, y, z);
 107                         for (s16 x = nmin.X; x <= nmax.X; x++) {
 108                                 if (vm->m_data[i].getContent() == dp.c_cobble) {
 109                                         float wetness = NoisePerlin3D(&dp.np_wetness, x, y, z, mg->seed);
 110                                         float density = NoisePerlin3D(&dp.np_density, x, y, z, blockseed);
 111                                         if (density < wetness / dp.mossratio)
 112                                                 vm->m_data[i].setContent(dp.c_moss);
 113                                 }
 114                                 i++;
 115                         }
 116                 }
 117         }
 118
 119         //printf("== gen dungeons: %dms\n", t.stop());
 120 }
 121
 122
 123 void DungeonGen::makeDungeon(v3s16 start_padding)
 124 {
 125         v3s16 areasize = vm->m_area.getExtent();
 126         v3s16 roomsize;
 127         v3s16 roomplace;
 128
 129         /*
 130                 Find place for first room
 131         */
 132         bool fits = false;
 133         for (u32 i = 0; i < 100 && !fits; i++)
 134         {
 135                 bool is_large_room = ((random.next() & 3) == 1);
 136                 roomsize = is_large_room ?
 137                         v3s16(random.range(8, 16),random.range(8, 16),random.range(8, 16)) :
 138                         v3s16(random.range(4,  8),random.range(4,  6),random.range(4, 8));
 139                 roomsize += dp.roomsize;
 140
 141                 // start_padding is used to disallow starting the generation of
 142                 // a dungeon in a neighboring generation chunk
 143                 roomplace = vm->m_area.MinEdge + start_padding + v3s16(
 144                         random.range(0,areasize.X-roomsize.X-1-start_padding.X),
 145                         random.range(0,areasize.Y-roomsize.Y-1-start_padding.Y),
 146                         random.range(0,areasize.Z-roomsize.Z-1-start_padding.Z));
 147
 148                 /*
 149                         Check that we're not putting the room to an unknown place,
 150                         otherwise it might end up floating in the air
 151                 */
 152                 fits = true;
 153                 for (s16 z = 1; z < roomsize.Z - 1; z++)
 154                 for (s16 y = 1; y < roomsize.Y - 1; y++)
 155                 for (s16 x = 1; x < roomsize.X - 1; x++)
 156                 {
 157                         v3s16 p = roomplace + v3s16(x, y, z);
 158                         u32 vi = vm->m_area.index(p);
 159                         if ((vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_INSIDE) ||
 160                                 vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 161                                 fits = false;
 162                                 break;
 163                         }
 164                 }
 165         }
 166         // No place found
 167         if (fits == false)
 168                 return;
 169
 170         /*
 171                 Stores the center position of the last room made, so that
 172                 a new corridor can be started from the last room instead of
 173                 the new room, if chosen so.
 174         */
 175         v3s16 last_room_center = roomplace + v3s16(roomsize.X / 2, 1, roomsize.Z / 2);
 176
 177         u32 room_count = random.range(2, 16);
 178         for (u32 i = 0; i < room_count; i++)
 179         {
 180                 // Make a room to the determined place
 181                 makeRoom(roomsize, roomplace);
 182
 183                 v3s16 room_center = roomplace + v3s16(roomsize.X / 2, 1, roomsize.Z / 2);
 184                 mg->gennotify.addEvent(dp.notifytype, room_center);
 185
 186 #ifdef DGEN_USE_TORCHES
 187                 // Place torch at room center (for testing)
 188                 vm->m_data[vm->m_area.index(room_center)] = MapNode(c_torch);
 189 #endif
 190
 191                 // Quit if last room
 192                 if (i == room_count - 1)
 193                         break;
 194
 195                 // Determine walker start position
 196
 197                 bool start_in_last_room = (random.range(0, 2) != 0);
 198
 199                 v3s16 walker_start_place;
 200
 201                 if (start_in_last_room) {
 202                         walker_start_place = last_room_center;
 203                 } else {
 204                         walker_start_place = room_center;
 205                         // Store center of current room as the last one
 206                         last_room_center = room_center;
 207                 }
 208
 209                 // Create walker and find a place for a door
 210                 v3s16 doorplace;
 211                 v3s16 doordir;
 212
 213                 m_pos = walker_start_place;
 214                 if (!findPlaceForDoor(doorplace, doordir))
 215                         return;
 216
 217                 if (random.range(0,1) == 0)
 218                         // Make the door
 219                         makeDoor(doorplace, doordir);
 220                 else
 221                         // Don't actually make a door
 222                         doorplace -= doordir;
 223
 224                 // Make a random corridor starting from the door
 225                 v3s16 corridor_end;
 226                 v3s16 corridor_end_dir;
 227                 makeCorridor(doorplace, doordir, corridor_end, corridor_end_dir);
 228
 229                 // Find a place for a random sized room
 230                 roomsize = v3s16(random.range(4,8),random.range(4,6),random.range(4,8));
 231                 roomsize += dp.roomsize;
 232
 233                 m_pos = corridor_end;
 234                 m_dir = corridor_end_dir;
 235                 if (!findPlaceForRoomDoor(roomsize, doorplace, doordir, roomplace))
 236                         return;
 237
 238                 if (random.range(0,1) == 0)
 239                         // Make the door
 240                         makeDoor(doorplace, doordir);
 241                 else
 242                         // Don't actually make a door
 243                         roomplace -= doordir;
 244
 245         }
 246 }
 247
 248
 249 void DungeonGen::makeRoom(v3s16 roomsize, v3s16 roomplace)
 250 {
 251         MapNode n_cobble(dp.c_cobble);
 252         MapNode n_air(CONTENT_AIR);
 253
 254         // Make +-X walls
 255         for (s16 z = 0; z < roomsize.Z; z++)
 256         for (s16 y = 0; y < roomsize.Y; y++)
 257         {
 258                 {
 259                         v3s16 p = roomplace + v3s16(0, y, z);
 260                         if (vm->m_area.contains(p) == false)
 261                                 continue;
 262                         u32 vi = vm->m_area.index(p);
 263                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 264                                 continue;
 265                         vm->m_data[vi] = n_cobble;
 266                 }
 267                 {
 268                         v3s16 p = roomplace + v3s16(roomsize.X - 1, y, z);
 269                         if (vm->m_area.contains(p) == false)
 270                                 continue;
 271                         u32 vi = vm->m_area.index(p);
 272                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 273                                 continue;
 274                         vm->m_data[vi] = n_cobble;
 275                 }
 276         }
 277
 278         // Make +-Z walls
 279         for (s16 x = 0; x < roomsize.X; x++)
 280         for (s16 y = 0; y < roomsize.Y; y++)
 281         {
 282                 {
 283                         v3s16 p = roomplace + v3s16(x, y, 0);
 284                         if (vm->m_area.contains(p) == false)
 285                                 continue;
 286                         u32 vi = vm->m_area.index(p);
 287                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 288                                 continue;
 289                         vm->m_data[vi] = n_cobble;
 290                 }
 291                 {
 292                         v3s16 p = roomplace + v3s16(x, y, roomsize.Z - 1);
 293                         if (vm->m_area.contains(p) == false)
 294                                 continue;
 295                         u32 vi = vm->m_area.index(p);
 296                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 297                                 continue;
 298                         vm->m_data[vi] = n_cobble;
 299                 }
 300         }
 301
 302         // Make +-Y walls (floor and ceiling)
 303         for (s16 z = 0; z < roomsize.Z; z++)
 304         for (s16 x = 0; x < roomsize.X; x++)
 305         {
 306                 {
 307                         v3s16 p = roomplace + v3s16(x, 0, z);
 308                         if (vm->m_area.contains(p) == false)
 309                                 continue;
 310                         u32 vi = vm->m_area.index(p);
 311                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 312                                 continue;
 313                         vm->m_data[vi] = n_cobble;
 314                 }
 315                 {
 316                         v3s16 p = roomplace + v3s16(x,roomsize. Y - 1, z);
 317                         if (vm->m_area.contains(p) == false)
 318                                 continue;
 319                         u32 vi = vm->m_area.index(p);
 320                         if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 321                                 continue;
 322                         vm->m_data[vi] = n_cobble;
 323                 }
 324         }
 325
 326         // Fill with air
 327         for (s16 z = 1; z < roomsize.Z - 1; z++)
 328         for (s16 y = 1; y < roomsize.Y - 1; y++)
 329         for (s16 x = 1; x < roomsize.X - 1; x++)
 330         {
 331                 v3s16 p = roomplace + v3s16(x, y, z);
 332                 if (vm->m_area.contains(p) == false)
 333                         continue;
 334                 u32 vi = vm->m_area.index(p);
 335                 vm->m_flags[vi] |= VMANIP_FLAG_DUNGEON_UNTOUCHABLE;
 336                 vm->m_data[vi]   = n_air;
 337         }
 338 }
 339
 340
 341 void DungeonGen::makeFill(v3s16 place, v3s16 size,
 342                 u8 avoid_flags, MapNode n, u8 or_flags)
 343 {
 344         for (s16 z = 0; z < size.Z; z++)
 345         for (s16 y = 0; y < size.Y; y++)
 346         for (s16 x = 0; x < size.X; x++)
 347         {
 348                 v3s16 p = place + v3s16(x, y, z);
 349                 if (vm->m_area.contains(p) == false)
 350                         continue;
 351                 u32 vi = vm->m_area.index(p);
 352                 if (vm->m_flags[vi] & avoid_flags)
 353                         continue;
 354                 vm->m_flags[vi] |= or_flags;
 355                 vm->m_data[vi]   = n;
 356         }
 357 }
 358
 359
 360 void DungeonGen::makeHole(v3s16 place)
 361 {
 362         makeFill(place, dp.holesize, 0,
 363                 MapNode(CONTENT_AIR), VMANIP_FLAG_DUNGEON_INSIDE);
 364 }
 365
 366
 367 void DungeonGen::makeDoor(v3s16 doorplace, v3s16 doordir)
 368 {
 369         makeHole(doorplace);
 370
 371 #ifdef DGEN_USE_TORCHES
 372         // Place torch (for testing)
 373         vm->m_data[vm->m_area.index(doorplace)] = MapNode(c_torch);
 374 #endif
 375 }
 376
 377
 378 void DungeonGen::makeCorridor(v3s16 doorplace,
 379                 v3s16 doordir, v3s16 &result_place, v3s16 &result_dir)
 380 {
 381         makeHole(doorplace);
 382         v3s16 p0 = doorplace;
 383         v3s16 dir = doordir;
 384         u32 length;
 385         /*if (random.next() % 2)
 386                 length = random.range(1, 13);
 387         else
 388                 length = random.range(1, 6);*/
 389         length = random.range(1, 13);
 390         u32 partlength = random.range(1, 13);
 391         u32 partcount = 0;
 392         s16 make_stairs = 0;
 393
 394         if (random.next() % 2 == 0 && partlength >= 3)
 395                 make_stairs = random.next() % 2 ? 1 : -1;
 396
 397         for (u32 i = 0; i < length; i++) {
 398                 v3s16 p = p0 + dir;
 399                 if (partcount != 0)
 400                         p.Y += make_stairs;
 401
 402                 if (vm->m_area.contains(p) == true &&
 403                         vm->m_area.contains(p + v3s16(0, 1, 0)) == true) {
 404                         if (make_stairs) {
 405                                 makeFill(p + v3s16(-1, -1, -1), dp.holesize + v3s16(2, 3, 2),
 406                                                 VMANIP_FLAG_DUNGEON_UNTOUCHABLE, MapNode(dp.c_cobble), 0);
 407                                 makeHole(p);
 408                                 makeHole(p - dir);
 409
 410                                 // TODO: fix stairs code so it works 100% (quite difficult)
 411
 412                                 // exclude stairs from the bottom step
 413                                 // exclude stairs from diagonal steps
 414                                 if (((dir.X ^ dir.Z) & 1) &&
 415                                         (((make_stairs ==  1) && i != 0) ||
 416                                         ((make_stairs == -1) && i != length - 1))) {
 417                                         // rotate face 180 deg if making stairs backwards
 418                                         int facedir = dir_to_facedir(dir * make_stairs);
 419
 420                                         u32 vi = vm->m_area.index(p.X - dir.X, p.Y - 1, p.Z - dir.Z);
 421                                         if (vm->m_data[vi].getContent() == dp.c_cobble)
 422                                                 vm->m_data[vi] = MapNode(dp.c_stair, 0, facedir);
 423
 424                                         vi = vm->m_area.index(p.X, p.Y, p.Z);
 425                                         if (vm->m_data[vi].getContent() == dp.c_cobble)
 426                                                 vm->m_data[vi] = MapNode(dp.c_stair, 0, facedir);
 427                                 }
 428                         } else {
 429                                 makeFill(p + v3s16(-1, -1, -1), dp.holesize + v3s16(2, 2, 2),
 430                                                 VMANIP_FLAG_DUNGEON_UNTOUCHABLE, MapNode(dp.c_cobble), 0);
 431                                 makeHole(p);
 432                         }
 433
 434                         p0 = p;
 435                 } else {
 436                         // Can't go here, turn away
 437                         dir = turn_xz(dir, random.range(0, 1));
 438                         make_stairs = -make_stairs;
 439                         partcount = 0;
 440                         partlength = random.range(1, length);
 441                         continue;
 442                 }
 443
 444                 partcount++;
 445                 if (partcount >= partlength) {
 446                         partcount = 0;
 447
 448                         dir = random_turn(random, dir);
 449
 450                         partlength = random.range(1,length);
 451
 452                         make_stairs = 0;
 453                         if (random.next() % 2 == 0 && partlength >= 3)
 454                                 make_stairs = random.next() % 2 ? 1 : -1;
 455                 }
 456         }
 457         result_place = p0;
 458         result_dir = dir;
 459 }
 460
 461
 462 bool DungeonGen::findPlaceForDoor(v3s16 &result_place, v3s16 &result_dir)
 463 {
 464         for (u32 i = 0; i < 100; i++)
 465         {
 466                 v3s16 p = m_pos + m_dir;
 467                 v3s16 p1 = p + v3s16(0, 1, 0);
 468                 if (vm->m_area.contains(p) == false
 469                  || vm->m_area.contains(p1) == false
 470                  || i % 4 == 0)
 471                 {
 472                         randomizeDir();
 473                         continue;
 474                 }
 475                 if (vm->getNodeNoExNoEmerge(p).getContent()  == dp.c_cobble
 476                  && vm->getNodeNoExNoEmerge(p1).getContent() == dp.c_cobble)
 477                 {
 478                         // Found wall, this is a good place!
 479                         result_place = p;
 480                         result_dir = m_dir;
 481                         // Randomize next direction
 482                         randomizeDir();
 483                         return true;
 484                 }
 485                 /*
 486                         Determine where to move next
 487                 */
 488                 // Jump one up if the actual space is there
 489                 if (vm->getNodeNoExNoEmerge(p+v3s16(0,0,0)).getContent() == dp.c_cobble
 490                  && vm->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() == CONTENT_AIR
 491                  && vm->getNodeNoExNoEmerge(p+v3s16(0,2,0)).getContent() == CONTENT_AIR)
 492                         p += v3s16(0,1,0);
 493                 // Jump one down if the actual space is there
 494                 if (vm->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() == dp.c_cobble
 495                  && vm->getNodeNoExNoEmerge(p+v3s16(0,0,0)).getContent() == CONTENT_AIR
 496                  && vm->getNodeNoExNoEmerge(p+v3s16(0,-1,0)).getContent() == CONTENT_AIR)
 497                         p += v3s16(0,-1,0);
 498                 // Check if walking is now possible
 499                 if (vm->getNodeNoExNoEmerge(p).getContent() != CONTENT_AIR
 500                  || vm->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() != CONTENT_AIR)
 501                 {
 502                         // Cannot continue walking here
 503                         randomizeDir();
 504                         continue;
 505                 }
 506                 // Move there
 507                 m_pos = p;
 508         }
 509         return false;
 510 }
 511
 512
 513 bool DungeonGen::findPlaceForRoomDoor(v3s16 roomsize, v3s16 &result_doorplace,
 514                 v3s16 &result_doordir, v3s16 &result_roomplace)
 515 {
 516         for (s16 trycount = 0; trycount < 30; trycount++)
 517         {
 518                 v3s16 doorplace;
 519                 v3s16 doordir;
 520                 bool r = findPlaceForDoor(doorplace, doordir);
 521                 if (r == false)
 522                         continue;
 523                 v3s16 roomplace;
 524                 // X east, Z north, Y up
 525 #if 1
 526                 if (doordir == v3s16(1, 0, 0)) // X+
 527                         roomplace = doorplace +
 528                                         v3s16(0, -1, random.range(-roomsize.Z + 2, -2));
 529                 if (doordir == v3s16(-1, 0, 0)) // X-
 530                         roomplace = doorplace +
 531                                         v3s16(-roomsize.X + 1, -1, random.range(-roomsize.Z + 2, -2));
 532                 if (doordir == v3s16(0, 0, 1)) // Z+
 533                         roomplace = doorplace +
 534                                         v3s16(random.range(-roomsize.X + 2, -2), -1, 0);
 535                 if (doordir == v3s16(0, 0, -1)) // Z-
 536                         roomplace = doorplace +
 537                                         v3s16(random.range(-roomsize.X + 2, -2), -1, -roomsize.Z + 1);
 538 #endif
 539 #if 0
 540                 if (doordir == v3s16(1, 0, 0)) // X+
 541                         roomplace = doorplace + v3s16(0, -1, -roomsize.Z / 2);
 542                 if (doordir == v3s16(-1, 0, 0)) // X-
 543                         roomplace = doorplace + v3s16(-roomsize.X+1,-1,-roomsize.Z / 2);
 544                 if (doordir == v3s16(0, 0, 1)) // Z+
 545                         roomplace = doorplace + v3s16(-roomsize.X / 2, -1, 0);
 546                 if (doordir == v3s16(0, 0, -1)) // Z-
 547                         roomplace = doorplace + v3s16(-roomsize.X / 2, -1, -roomsize.Z + 1);
 548 #endif
 549
 550                 // Check fit
 551                 bool fits = true;
 552                 for (s16 z = 1; z < roomsize.Z - 1; z++)
 553                 for (s16 y = 1; y < roomsize.Y - 1; y++)
 554                 for (s16 x = 1; x < roomsize.X - 1; x++)
 555                 {
 556                         v3s16 p = roomplace + v3s16(x, y, z);
 557                         if (vm->m_area.contains(p) == false)
 558                         {
 559                                 fits = false;
 560                                 break;
 561                         }
 562                         if (vm->m_flags[vm->m_area.index(p)]
 563                                         & VMANIP_FLAG_DUNGEON_INSIDE)
 564                         {
 565                                 fits = false;
 566                                 break;
 567                         }
 568                 }
 569                 if(fits == false)
 570                 {
 571                         // Find new place
 572                         continue;
 573                 }
 574                 result_doorplace = doorplace;
 575                 result_doordir   = doordir;
 576                 result_roomplace = roomplace;
 577                 return true;
 578         }
 579         return false;
 580 }
 581
 582
 583 v3s16 rand_ortho_dir(PseudoRandom &random, bool diagonal_dirs)
 584 {
 585         // Make diagonal directions somewhat rare
 586         if (diagonal_dirs && (random.next() % 4 == 0)) {
 587                 v3s16 dir;
 588                 int trycount = 0;
 589
 590                 do {
 591                         trycount++;
 592                         dir = v3s16(random.next() % 3 - 1, 0, random.next() % 3 - 1);
 593                 } while ((dir.X == 0 && dir.Z == 0) && trycount < 10);
 594
 595                 return dir;
 596         } else {
 597                 if (random.next() % 2 == 0)
 598                         return random.next() % 2 ? v3s16(-1, 0, 0) : v3s16(1, 0, 0);
 599                 else
 600                         return random.next() % 2 ? v3s16(0, 0, -1) : v3s16(0, 0, 1);
 601         }
 602 }
 603
 604
 605 v3s16 turn_xz(v3s16 olddir, int t)
 606 {
 607         v3s16 dir;
 608         if (t == 0)
 609         {
 610                 // Turn right
 611                 dir.X = olddir.Z;
 612                 dir.Z = -olddir.X;
 613                 dir.Y = olddir.Y;
 614         }
 615         else
 616         {
 617                 // Turn left
 618                 dir.X = -olddir.Z;
 619                 dir.Z = olddir.X;
 620                 dir.Y = olddir.Y;
 621         }
 622         return dir;
 623 }
 624
 625
 626 v3s16 random_turn(PseudoRandom &random, v3s16 olddir)
 627 {
 628         int turn = random.range(0, 2);
 629         v3s16 dir;
 630         if (turn == 0)
 631         {
 632                 // Go straight
 633                 dir = olddir;
 634         }
 635         else if (turn == 1)
 636                 // Turn right
 637                 dir = turn_xz(olddir, 0);
 638         else
 639                 // Turn left
 640                 dir = turn_xz(olddir, 1);
 641         return dir;
 642 }
 643
 644
 645 int dir_to_facedir(v3s16 d) {
 646         if (abs(d.X) > abs(d.Z))
 647                 return d.X < 0 ? 3 : 1;
 648         else
 649                 return d.Z < 0 ? 2 : 0;
 650 }