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(INodeDefManager *ndef, u64 seed, s16 waterlevel,
  46                                                 DungeonParams *dparams) {
  47         this->ndef        = ndef;
  48         this->mapseed     = seed;
  49         this->water_level = waterlevel;
  50
  51 #ifdef DGEN_USE_TORCHES
  52         c_torch  = ndef->getId("default:torch");
  53 #endif
  54
  55         if (dparams) {
  56                 memcpy(&dp, dparams, sizeof(dp));
  57         } else {
  58                 dp.c_water  = ndef->getId("mapgen_water_source");
  59                 dp.c_cobble = ndef->getId("mapgen_cobble");
  60                 dp.c_moss   = ndef->getId("mapgen_mossycobble");
  61                 dp.c_stair  = ndef->getId("mapgen_stair_cobble");
  62
  63                 dp.diagonal_dirs = false;
  64                 dp.mossratio = 3.0;
  65                 dp.holesize  = v3s16(1, 2, 1);
  66                 dp.roomsize  = v3s16(0,0,0);
  67
  68                 dp.np_rarity  = nparams_dungeon_rarity;
  69                 dp.np_wetness = nparams_dungeon_wetness;
  70                 dp.np_density = nparams_dungeon_density;
  71         }
  72 }
  73
  74
  75 void DungeonGen::generate(ManualMapVoxelManipulator *vm, u32 bseed,
  76                                                 v3s16 nmin, v3s16 nmax) {
  77         //TimeTaker t("gen dungeons");
  78         int approx_groundlevel = 10 + water_level;
  79
  80         if ((nmin.Y + nmax.Y) / 2 >= approx_groundlevel ||
  81                 NoisePerlin3D(&dp.np_rarity, nmin.X, nmin.Y, nmin.Z, mapseed) < 0.2)
  82                 return;
  83
  84         this->vmanip    = vm;
  85         this->blockseed = bseed;
  86         random.seed(bseed + 2);
  87
  88         // Dungeon generator doesn't modify places which have this set
  89         vmanip->clearFlag(VMANIP_FLAG_DUNGEON_INSIDE | VMANIP_FLAG_DUNGEON_PRESERVE);
  90
  91         // Set all air and water to be untouchable to make dungeons open
  92         // to caves and open air
  93         for (s16 z = nmin.Z; z <= nmax.Z; z++) {
  94                 for (s16 y = nmin.Y; y <= nmax.Y; y++) {
  95                         u32 i = vmanip->m_area.index(nmin.X, y, z);
  96                         for (s16 x = nmin.X; x <= nmax.X; x++) {
  97                                 content_t c = vmanip->m_data[i].getContent();
  98                                 if (c == CONTENT_AIR || c == dp.c_water)
  99                                         vmanip->m_flags[i] |= VMANIP_FLAG_DUNGEON_PRESERVE;
 100                                 i++;
 101                         }
 102                 }
 103         }
 104
 105         // Add it
 106         makeDungeon(v3s16(1,1,1) * MAP_BLOCKSIZE);
 107
 108         // Convert some cobble to mossy cobble
 109         if (dp.mossratio != 0.0) {
 110                 for (s16 z = nmin.Z; z <= nmax.Z; z++)
 111                 for (s16 y = nmin.Y; y <= nmax.Y; y++) {
 112                         u32 i = vmanip->m_area.index(nmin.X, y, z);
 113                         for (s16 x = nmin.X; x <= nmax.X; x++) {
 114                                 if (vmanip->m_data[i].getContent() == dp.c_cobble) {
 115                                         float wetness = NoisePerlin3D(&dp.np_wetness, x, y, z, mapseed);
 116                                         float density = NoisePerlin3D(&dp.np_density, x, y, z, blockseed);
 117                                         if (density < wetness / dp.mossratio)
 118                                                 vmanip->m_data[i].setContent(dp.c_moss);
 119                                 }
 120                                 i++;
 121                         }
 122                 }
 123         }
 124
 125         //printf("== gen dungeons: %dms\n", t.stop());
 126 }
 127
 128
 129 void DungeonGen::makeDungeon(v3s16 start_padding)
 130 {
 131         v3s16 areasize = vmanip->m_area.getExtent();
 132         v3s16 roomsize;
 133         v3s16 roomplace;
 134
 135         /*
 136                 Find place for first room
 137         */
 138         bool fits = false;
 139         for (u32 i = 0; i < 100; i++)
 140         {
 141                 bool is_large_room = ((random.next() & 3) == 1);
 142                 roomsize = is_large_room ?
 143                         v3s16(random.range(8, 16),random.range(8, 16),random.range(8, 16)) :
 144                         v3s16(random.range(4,  8),random.range(4,  6),random.range(4, 8));
 145                 roomsize += dp.roomsize;
 146
 147                 // start_padding is used to disallow starting the generation of
 148                 // a dungeon in a neighboring generation chunk
 149                 roomplace = vmanip->m_area.MinEdge + start_padding + v3s16(
 150                         random.range(0,areasize.X-roomsize.X-1-start_padding.X),
 151                         random.range(0,areasize.Y-roomsize.Y-1-start_padding.Y),
 152                         random.range(0,areasize.Z-roomsize.Z-1-start_padding.Z));
 153
 154                 /*
 155                         Check that we're not putting the room to an unknown place,
 156                         otherwise it might end up floating in the air
 157                 */
 158                 fits = true;
 159                 for (s16 z = 1; z < roomsize.Z - 1; z++)
 160                 for (s16 y = 1; y < roomsize.Y - 1; y++)
 161                 for (s16 x = 1; x < roomsize.X - 1; x++)
 162                 {
 163                         v3s16 p = roomplace + v3s16(x, y, z);
 164                         u32 vi = vmanip->m_area.index(p);
 165                         if (vmanip->m_flags[vi] & VMANIP_FLAG_DUNGEON_INSIDE)
 166                         {
 167                                 fits = false;
 168                                 break;
 169                         }
 170                         if (vmanip->m_data[vi].getContent() == CONTENT_IGNORE)
 171                         {
 172                                 fits = false;
 173                                 break;
 174                         }
 175                 }
 176                 if (fits)
 177                         break;
 178         }
 179         // No place found
 180         if (fits == false)
 181                 return;
 182
 183         /*
 184                 Stores the center position of the last room made, so that
 185                 a new corridor can be started from the last room instead of
 186                 the new room, if chosen so.
 187         */
 188         v3s16 last_room_center = roomplace + v3s16(roomsize.X / 2, 1, roomsize.Z / 2);
 189
 190         u32 room_count = random.range(2, 16);
 191         for (u32 i = 0; i < room_count; i++)
 192         {
 193                 // Make a room to the determined place
 194                 makeRoom(roomsize, roomplace);
 195
 196                 v3s16 room_center = roomplace + v3s16(roomsize.X / 2, 1, roomsize.Z / 2);
 197
 198 #ifdef DGEN_USE_TORCHES
 199                 // Place torch at room center (for testing)
 200                 vmanip->m_data[vmanip->m_area.index(room_center)] = MapNode(c_torch);
 201 #endif
 202
 203                 // Quit if last room
 204                 if (i == room_count - 1)
 205                         break;
 206
 207                 // Determine walker start position
 208
 209                 bool start_in_last_room = (random.range(0, 2) != 0);
 210
 211                 v3s16 walker_start_place;
 212
 213                 if(start_in_last_room)
 214                 {
 215                         walker_start_place = last_room_center;
 216                 }
 217                 else
 218                 {
 219                         walker_start_place = room_center;
 220                         // Store center of current room as the last one
 221                         last_room_center = room_center;
 222                 }
 223
 224                 // Create walker and find a place for a door
 225                 v3s16 doorplace;
 226                 v3s16 doordir;
 227
 228                 m_pos = walker_start_place;
 229                 bool r = findPlaceForDoor(doorplace, doordir);
 230                 if (r == false)
 231                         return;
 232
 233                 if (random.range(0,1) == 0)
 234                         // Make the door
 235                         makeDoor(doorplace, doordir);
 236                 else
 237                         // Don't actually make a door
 238                         doorplace -= doordir;
 239
 240                 // Make a random corridor starting from the door
 241                 v3s16 corridor_end;
 242                 v3s16 corridor_end_dir;
 243                 makeCorridor(doorplace, doordir, corridor_end, corridor_end_dir);
 244
 245                 // Find a place for a random sized room
 246                 roomsize = v3s16(random.range(4,8),random.range(4,6),random.range(4,8));
 247                 roomsize += dp.roomsize;
 248
 249                 m_pos = corridor_end;
 250                 m_dir = corridor_end_dir;
 251                 r = findPlaceForRoomDoor(roomsize, doorplace, doordir, roomplace);
 252                 if (r == false)
 253                         return;
 254
 255                 if (random.range(0,1) == 0)
 256                         // Make the door
 257                         makeDoor(doorplace, doordir);
 258                 else
 259                         // Don't actually make a door
 260                         roomplace -= doordir;
 261
 262         }
 263 }
 264
 265
 266 void DungeonGen::makeRoom(v3s16 roomsize, v3s16 roomplace)
 267 {
 268         MapNode n_cobble(dp.c_cobble);
 269         MapNode n_air(CONTENT_AIR);
 270
 271         // Make +-X walls
 272         for (s16 z = 0; z < roomsize.Z; z++)
 273         for (s16 y = 0; y < roomsize.Y; y++)
 274         {
 275                 {
 276                         v3s16 p = roomplace + v3s16(0, y, z);
 277                         if (vmanip->m_area.contains(p) == false)
 278                                 continue;
 279                         u32 vi = vmanip->m_area.index(p);
 280                         if (vmanip->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 281                                 continue;
 282                         vmanip->m_data[vi] = n_cobble;
 283                 }
 284                 {
 285                         v3s16 p = roomplace + v3s16(roomsize.X - 1, y, z);
 286                         if (vmanip->m_area.contains(p) == false)
 287                                 continue;
 288                         u32 vi = vmanip->m_area.index(p);
 289                         if (vmanip->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 290                                 continue;
 291                         vmanip->m_data[vi] = n_cobble;
 292                 }
 293         }
 294
 295         // Make +-Z walls
 296         for (s16 x = 0; x < roomsize.X; x++)
 297         for (s16 y = 0; y < roomsize.Y; y++)
 298         {
 299                 {
 300                         v3s16 p = roomplace + v3s16(x, y, 0);
 301                         if (vmanip->m_area.contains(p) == false)
 302                                 continue;
 303                         u32 vi = vmanip->m_area.index(p);
 304                         if (vmanip->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 305                                 continue;
 306                         vmanip->m_data[vi] = n_cobble;
 307                 }
 308                 {
 309                         v3s16 p = roomplace + v3s16(x, y, roomsize.Z - 1);
 310                         if (vmanip->m_area.contains(p) == false)
 311                                 continue;
 312                         u32 vi = vmanip->m_area.index(p);
 313                         if (vmanip->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 314                                 continue;
 315                         vmanip->m_data[vi] = n_cobble;
 316                 }
 317         }
 318
 319         // Make +-Y walls (floor and ceiling)
 320         for (s16 z = 0; z < roomsize.Z; z++)
 321         for (s16 x = 0; x < roomsize.X; x++)
 322         {
 323                 {
 324                         v3s16 p = roomplace + v3s16(x, 0, z);
 325                         if (vmanip->m_area.contains(p) == false)
 326                                 continue;
 327                         u32 vi = vmanip->m_area.index(p);
 328                         if (vmanip->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 329                                 continue;
 330                         vmanip->m_data[vi] = n_cobble;
 331                 }
 332                 {
 333                         v3s16 p = roomplace + v3s16(x,roomsize. Y - 1, z);
 334                         if (vmanip->m_area.contains(p) == false)
 335                                 continue;
 336                         u32 vi = vmanip->m_area.index(p);
 337                         if (vmanip->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
 338                                 continue;
 339                         vmanip->m_data[vi] = n_cobble;
 340                 }
 341         }
 342
 343         // Fill with air
 344         for (s16 z = 1; z < roomsize.Z - 1; z++)
 345         for (s16 y = 1; y < roomsize.Y - 1; y++)
 346         for (s16 x = 1; x < roomsize.X - 1; x++)
 347         {
 348                 v3s16 p = roomplace + v3s16(x, y, z);
 349                 if (vmanip->m_area.contains(p) == false)
 350                         continue;
 351                 u32 vi = vmanip->m_area.index(p);
 352                 vmanip->m_flags[vi] |= VMANIP_FLAG_DUNGEON_UNTOUCHABLE;
 353                 vmanip->m_data[vi]   = n_air;
 354         }
 355 }
 356
 357
 358 void DungeonGen::makeFill(v3s16 place, v3s16 size,
 359                 u8 avoid_flags, MapNode n, u8 or_flags)
 360 {
 361         for (s16 z = 0; z < size.Z; z++)
 362         for (s16 y = 0; y < size.Y; y++)
 363         for (s16 x = 0; x < size.X; x++)
 364         {
 365                 v3s16 p = place + v3s16(x, y, z);
 366                 if (vmanip->m_area.contains(p) == false)
 367                         continue;
 368                 u32 vi = vmanip->m_area.index(p);
 369                 if (vmanip->m_flags[vi] & avoid_flags)
 370                         continue;
 371                 vmanip->m_flags[vi] |= or_flags;
 372                 vmanip->m_data[vi]   = n;
 373         }
 374 }
 375
 376
 377 void DungeonGen::makeHole(v3s16 place)
 378 {
 379         makeFill(place, dp.holesize, 0,
 380                 MapNode(CONTENT_AIR), VMANIP_FLAG_DUNGEON_INSIDE);
 381 }
 382
 383
 384 void DungeonGen::makeDoor(v3s16 doorplace, v3s16 doordir)
 385 {
 386         makeHole(doorplace);
 387
 388 #ifdef DGEN_USE_TORCHES
 389         // Place torch (for testing)
 390         vmanip->m_data[vmanip->m_area.index(doorplace)] = MapNode(c_torch);
 391 #endif
 392 }
 393
 394
 395 void DungeonGen::makeCorridor(v3s16 doorplace,
 396                 v3s16 doordir, v3s16 &result_place, v3s16 &result_dir)
 397 {
 398         makeHole(doorplace);
 399         v3s16 p0 = doorplace;
 400         v3s16 dir = doordir;
 401         u32 length;
 402         /*if (random.next() % 2)
 403                 length = random.range(1, 13);
 404         else
 405                 length = random.range(1, 6);*/
 406         length = random.range(1, 13);
 407         u32 partlength = random.range(1, 13);
 408         u32 partcount = 0;
 409         s16 make_stairs = 0;
 410
 411         if (random.next() % 2 == 0 && partlength >= 3)
 412                 make_stairs = random.next() % 2 ? 1 : -1;
 413
 414         for (u32 i = 0; i < length; i++) {
 415                 v3s16 p = p0 + dir;
 416                 if (partcount != 0)
 417                         p.Y += make_stairs;
 418
 419                 if (vmanip->m_area.contains(p) == true &&
 420                         vmanip->m_area.contains(p + v3s16(0, 1, 0)) == true) {
 421                         if (make_stairs) {
 422                                 makeFill(p + v3s16(-1, -1, -1), dp.holesize + v3s16(2, 3, 2),
 423                                                 VMANIP_FLAG_DUNGEON_UNTOUCHABLE, MapNode(dp.c_cobble), 0);
 424                                 makeHole(p);
 425                                 makeHole(p - dir);
 426
 427                                 // TODO: fix stairs code so it works 100% (quite difficult)
 428
 429                                 // exclude stairs from the bottom step
 430                                 // exclude stairs from diagonal steps
 431                                 if (((dir.X ^ dir.Z) & 1) &&
 432                                         (((make_stairs ==  1) && i != 0) ||
 433                                         ((make_stairs == -1) && i != length - 1))) {
 434                                         // rotate face 180 deg if making stairs backwards
 435                                         int facedir = dir_to_facedir(dir * make_stairs);
 436
 437                                         u32 vi = vmanip->m_area.index(p.X - dir.X, p.Y - 1, p.Z - dir.Z);
 438                                         if (vmanip->m_data[vi].getContent() == dp.c_cobble)
 439                                                 vmanip->m_data[vi] = MapNode(dp.c_stair, 0, facedir);
 440
 441                                         vi = vmanip->m_area.index(p.X, p.Y, p.Z);
 442                                         if (vmanip->m_data[vi].getContent() == dp.c_cobble)
 443                                                 vmanip->m_data[vi] = MapNode(dp.c_stair, 0, facedir);
 444                                 }
 445                         } else {
 446                                 makeFill(p + v3s16(-1, -1, -1), dp.holesize + v3s16(2, 2, 2),
 447                                                 VMANIP_FLAG_DUNGEON_UNTOUCHABLE, MapNode(dp.c_cobble), 0);
 448                                 makeHole(p);
 449                         }
 450
 451                         p0 = p;
 452                 } else {
 453                         // Can't go here, turn away
 454                         dir = turn_xz(dir, random.range(0, 1));
 455                         make_stairs = -make_stairs;
 456                         partcount = 0;
 457                         partlength = random.range(1, length);
 458                         continue;
 459                 }
 460
 461                 partcount++;
 462                 if (partcount >= partlength) {
 463                         partcount = 0;
 464
 465                         dir = random_turn(random, dir);
 466
 467                         partlength = random.range(1,length);
 468
 469                         make_stairs = 0;
 470                         if (random.next() % 2 == 0 && partlength >= 3)
 471                                 make_stairs = random.next() % 2 ? 1 : -1;
 472                 }
 473         }
 474         result_place = p0;
 475         result_dir = dir;
 476 }
 477
 478
 479 bool DungeonGen::findPlaceForDoor(v3s16 &result_place, v3s16 &result_dir)
 480 {
 481         for (u32 i = 0; i < 100; i++)
 482         {
 483                 v3s16 p = m_pos + m_dir;
 484                 v3s16 p1 = p + v3s16(0, 1, 0);
 485                 if (vmanip->m_area.contains(p) == false
 486                  || vmanip->m_area.contains(p1) == false
 487                  || i % 4 == 0)
 488                 {
 489                         randomizeDir();
 490                         continue;
 491                 }
 492                 if (vmanip->getNodeNoExNoEmerge(p).getContent()  == dp.c_cobble
 493                  && vmanip->getNodeNoExNoEmerge(p1).getContent() == dp.c_cobble)
 494                 {
 495                         // Found wall, this is a good place!
 496                         result_place = p;
 497                         result_dir = m_dir;
 498                         // Randomize next direction
 499                         randomizeDir();
 500                         return true;
 501                 }
 502                 /*
 503                         Determine where to move next
 504                 */
 505                 // Jump one up if the actual space is there
 506                 if (vmanip->getNodeNoExNoEmerge(p+v3s16(0,0,0)).getContent() == dp.c_cobble
 507                  && vmanip->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() == CONTENT_AIR
 508                  && vmanip->getNodeNoExNoEmerge(p+v3s16(0,2,0)).getContent() == CONTENT_AIR)
 509                         p += v3s16(0,1,0);
 510                 // Jump one down if the actual space is there
 511                 if (vmanip->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() == dp.c_cobble
 512                  && vmanip->getNodeNoExNoEmerge(p+v3s16(0,0,0)).getContent() == CONTENT_AIR
 513                  && vmanip->getNodeNoExNoEmerge(p+v3s16(0,-1,0)).getContent() == CONTENT_AIR)
 514                         p += v3s16(0,-1,0);
 515                 // Check if walking is now possible
 516                 if (vmanip->getNodeNoExNoEmerge(p).getContent() != CONTENT_AIR
 517                  || vmanip->getNodeNoExNoEmerge(p+v3s16(0,1,0)).getContent() != CONTENT_AIR)
 518                 {
 519                         // Cannot continue walking here
 520                         randomizeDir();
 521                         continue;
 522                 }
 523                 // Move there
 524                 m_pos = p;
 525         }
 526         return false;
 527 }
 528
 529
 530 bool DungeonGen::findPlaceForRoomDoor(v3s16 roomsize, v3s16 &result_doorplace,
 531                 v3s16 &result_doordir, v3s16 &result_roomplace)
 532 {
 533         for (s16 trycount = 0; trycount < 30; trycount++)
 534         {
 535                 v3s16 doorplace;
 536                 v3s16 doordir;
 537                 bool r = findPlaceForDoor(doorplace, doordir);
 538                 if (r == false)
 539                         continue;
 540                 v3s16 roomplace;
 541                 // X east, Z north, Y up
 542 #if 1
 543                 if (doordir == v3s16(1, 0, 0)) // X+
 544                         roomplace = doorplace +
 545                                         v3s16(0, -1, random.range(-roomsize.Z + 2, -2));
 546                 if (doordir == v3s16(-1, 0, 0)) // X-
 547                         roomplace = doorplace +
 548                                         v3s16(-roomsize.X + 1, -1, random.range(-roomsize.Z + 2, -2));
 549                 if (doordir == v3s16(0, 0, 1)) // Z+
 550                         roomplace = doorplace +
 551                                         v3s16(random.range(-roomsize.X + 2, -2), -1, 0);
 552                 if (doordir == v3s16(0, 0, -1)) // Z-
 553                         roomplace = doorplace +
 554                                         v3s16(random.range(-roomsize.X + 2, -2), -1, -roomsize.Z + 1);
 555 #endif
 556 #if 0
 557                 if (doordir == v3s16(1, 0, 0)) // X+
 558                         roomplace = doorplace + v3s16(0, -1, -roomsize.Z / 2);
 559                 if (doordir == v3s16(-1, 0, 0)) // X-
 560                         roomplace = doorplace + v3s16(-roomsize.X+1,-1,-roomsize.Z / 2);
 561                 if (doordir == v3s16(0, 0, 1)) // Z+
 562                         roomplace = doorplace + v3s16(-roomsize.X / 2, -1, 0);
 563                 if (doordir == v3s16(0, 0, -1)) // Z-
 564                         roomplace = doorplace + v3s16(-roomsize.X / 2, -1, -roomsize.Z + 1);
 565 #endif
 566
 567                 // Check fit
 568                 bool fits = true;
 569                 for (s16 z = 1; z < roomsize.Z - 1; z++)
 570                 for (s16 y = 1; y < roomsize.Y - 1; y++)
 571                 for (s16 x = 1; x < roomsize.X - 1; x++)
 572                 {
 573                         v3s16 p = roomplace + v3s16(x, y, z);
 574                         if (vmanip->m_area.contains(p) == false)
 575                         {
 576                                 fits = false;
 577                                 break;
 578                         }
 579                         if (vmanip->m_flags[vmanip->m_area.index(p)]
 580                                         & VMANIP_FLAG_DUNGEON_INSIDE)
 581                         {
 582                                 fits = false;
 583                                 break;
 584                         }
 585                 }
 586                 if(fits == false)
 587                 {
 588                         // Find new place
 589                         continue;
 590                 }
 591                 result_doorplace = doorplace;
 592                 result_doordir   = doordir;
 593                 result_roomplace = roomplace;
 594                 return true;
 595         }
 596         return false;
 597 }
 598
 599
 600 v3s16 rand_ortho_dir(PseudoRandom &random, bool diagonal_dirs)
 601 {
 602         // Make diagonal directions somewhat rare
 603         if (diagonal_dirs && (random.next() % 4 == 0)) {
 604                 v3s16 dir;
 605                 int trycount = 0;
 606
 607                 do {
 608                         trycount++;
 609                         dir = v3s16(random.next() % 3 - 1, 0, random.next() % 3 - 1);
 610                 } while ((dir.X == 0 && dir.Z == 0) && trycount < 10);
 611
 612                 return dir;
 613         } else {
 614                 if (random.next() % 2 == 0)
 615                         return random.next() % 2 ? v3s16(-1, 0, 0) : v3s16(1, 0, 0);
 616                 else
 617                         return random.next() % 2 ? v3s16(0, 0, -1) : v3s16(0, 0, 1);
 618         }
 619 }
 620
 621
 622 v3s16 turn_xz(v3s16 olddir, int t)
 623 {
 624         v3s16 dir;
 625         if (t == 0)
 626         {
 627                 // Turn right
 628                 dir.X = olddir.Z;
 629                 dir.Z = -olddir.X;
 630                 dir.Y = olddir.Y;
 631         }
 632         else
 633         {
 634                 // Turn left
 635                 dir.X = -olddir.Z;
 636                 dir.Z = olddir.X;
 637                 dir.Y = olddir.Y;
 638         }
 639         return dir;
 640 }
 641
 642
 643 v3s16 random_turn(PseudoRandom &random, v3s16 olddir)
 644 {
 645         int turn = random.range(0, 2);
 646         v3s16 dir;
 647         if (turn == 0)
 648         {
 649                 // Go straight
 650                 dir = olddir;
 651         }
 652         else if (turn == 1)
 653                 // Turn right
 654                 dir = turn_xz(olddir, 0);
 655         else
 656                 // Turn left
 657                 dir = turn_xz(olddir, 1);
 658         return dir;
 659 }
 660
 661
 662 int dir_to_facedir(v3s16 d) {
 663         if (abs(d.X) > abs(d.Z))
 664                 return d.X < 0 ? 3 : 1;
 665         else
 666                 return d.Z < 0 ? 2 : 0;
 667 }