src/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   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
  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 "content_sao.h"
  28 #include "nodedef.h"
  29 #include "voxelalgorithms.h"
  30 #include "profiler.h"
  31 #include "settings.h" // For g_settings
  32 #include "main.h" // For g_profiler
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.h"
  36 #include "treegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_v7.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_v7[] = {
  44         {"mountains", MGV7_MOUNTAINS},
  45         {"ridges",    MGV7_RIDGES},
  46         {NULL,        0}
  47 };
  48
  49 ///////////////////////////////////////////////////////////////////////////////
  50
  51
  52 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  53         : Mapgen(mapgenid, params, emerge)
  54 {
  55         this->m_emerge = emerge;
  56         this->bmgr     = emerge->biomemgr;
  57
  58         //// amount of elements to skip for the next index
  59         //// for noise/height/biome maps (not vmanip)
  60         this->ystride = csize.X;
  61         this->zstride = csize.X * csize.Y;
  62
  63         this->biomemap  = new u8[csize.X * csize.Z];
  64         this->heightmap = new s16[csize.X * csize.Z];
  65         this->ridge_heightmap = new s16[csize.X * csize.Z];
  66
  67         initHeightMap(this->heightmap, csize.X * csize.Z);
  68
  69         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  70         this->spflags = sp->spflags;
  71
  72         //// Terrain noise
  73         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  74         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  75         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  76         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  77         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  78         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  79         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  80
  81         //// 3d terrain noise
  82         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y, csize.Z);
  83         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y, csize.Z);
  84         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y, csize.Z);
  85         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y, csize.Z);
  86
  87         //// Biome noise
  88         noise_heat     = new Noise(&params->np_biome_heat,     seed, csize.X, csize.Z);
  89         noise_humidity = new Noise(&params->np_biome_humidity, seed, csize.X, csize.Z);
  90
  91         //// Resolve nodes to be used
  92         INodeDefManager *ndef = emerge->ndef;
  93
  94         c_stone           = ndef->getId("mapgen_stone");
  95         c_dirt            = ndef->getId("mapgen_dirt");
  96         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  97         c_sand            = ndef->getId("mapgen_sand");
  98         c_water_source    = ndef->getId("mapgen_water_source");
  99         c_lava_source     = ndef->getId("mapgen_lava_source");
 100         c_ice             = ndef->getId("default:ice");
 101         if (c_ice == CONTENT_IGNORE)
 102                 c_ice = CONTENT_AIR;
 103 }
 104
 105
 106 MapgenV7::~MapgenV7()
 107 {
 108         delete noise_terrain_base;
 109         delete noise_terrain_persist;
 110         delete noise_height_select;
 111         delete noise_terrain_alt;
 112         delete noise_filler_depth;
 113         delete noise_mount_height;
 114         delete noise_ridge_uwater;
 115         delete noise_mountain;
 116         delete noise_ridge;
 117         delete noise_cave1;
 118         delete noise_cave2;
 119
 120         delete noise_heat;
 121         delete noise_humidity;
 122
 123         delete[] ridge_heightmap;
 124         delete[] heightmap;
 125         delete[] biomemap;
 126 }
 127
 128
 129 MapgenV7Params::MapgenV7Params()
 130 {
 131         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 132
 133         np_terrain_base    = NoiseParams(4,    70,  v3f(300, 300, 300), 82341, 6, 0.7,  2.0);
 134         np_terrain_alt     = NoiseParams(4,    25,  v3f(600, 600, 600), 5934,  5, 0.6,  2.0);
 135         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500, 500, 500), 539,   3, 0.6,  2.0);
 136         np_height_select   = NoiseParams(-0.5, 1,   v3f(250, 250, 250), 4213,  5, 0.69, 2.0);
 137         np_filler_depth    = NoiseParams(0,    1.2, v3f(150, 150, 150), 261,   4, 0.7,  2.0);
 138         np_mount_height    = NoiseParams(100,  30,  v3f(500, 500, 500), 72449, 4, 0.6,  2.0);
 139         np_ridge_uwater    = NoiseParams(0,    1,   v3f(500, 500, 500), 85039, 4, 0.6,  2.0);
 140         np_mountain        = NoiseParams(-0.6, 1,   v3f(250, 350, 250), 5333,  5, 0.68, 2.0);
 141         np_ridge           = NoiseParams(0,    1,   v3f(100, 100, 100), 6467,  4, 0.75, 2.0);
 142         np_cave1           = NoiseParams(0,    12,  v3f(100, 100, 100), 52534, 4, 0.5,  2.0);
 143         np_cave2           = NoiseParams(0,    12,  v3f(100, 100, 100), 10325, 4, 0.5,  2.0);
 144 }
 145
 146
 147 void MapgenV7Params::readParams(Settings *settings)
 148 {
 149         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 150
 151         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 152         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 153         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 154         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 155         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 156         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 157         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 158         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 159         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 160         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 161         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 162 }
 163
 164
 165 void MapgenV7Params::writeParams(Settings *settings)
 166 {
 167         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 168
 169         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 170         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 171         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 172         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 173         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 174         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 175         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 176         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 177         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 178         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 179         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 180 }
 181
 182
 183 ///////////////////////////////////////
 184
 185
 186 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 187 {
 188         // Base terrain calculation
 189         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 190
 191         // Ridge/river terrain calculation
 192         float width = 0.2;
 193         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 194         // actually computing the depth of the ridge is much more expensive;
 195         // if inside a river, simply guess
 196         if (fabs(uwatern) <= width)
 197                 return water_level - 10;
 198
 199         // Mountain terrain calculation
 200         int iters = 128; // don't even bother iterating more than 128 times..
 201         while (iters--) {
 202                 //current point would have been air
 203                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 204                         return y;
 205
 206                 y++;
 207         }
 208
 209         return y;
 210 }
 211
 212
 213 void MapgenV7::makeChunk(BlockMakeData *data)
 214 {
 215         // Pre-conditions
 216         assert(data->vmanip);
 217         assert(data->nodedef);
 218         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 219                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 220                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 221         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 222                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 223                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 224
 225         this->generating = true;
 226         this->vm   = data->vmanip;
 227         this->ndef = data->nodedef;
 228         //TimeTaker t("makeChunk");
 229
 230         v3s16 blockpos_min = data->blockpos_min;
 231         v3s16 blockpos_max = data->blockpos_max;
 232         node_min = blockpos_min * MAP_BLOCKSIZE;
 233         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 234         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 235         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 236
 237         blockseed = getBlockSeed2(full_node_min, seed);
 238
 239         // Make some noise
 240         calculateNoise();
 241
 242         // Generate base terrain, mountains, and ridges with initial heightmaps
 243         s16 stone_surface_max_y = generateTerrain();
 244
 245         // Create heightmap
 246         updateHeightmap(node_min, node_max);
 247
 248         // Create biomemap at heightmap surface
 249         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 250                 noise_humidity->result, heightmap, biomemap);
 251
 252         // Actually place the biome-specific nodes
 253         generateBiomes(noise_heat->result, noise_humidity->result);
 254
 255         if (flags & MG_CAVES)
 256                 generateCaves(stone_surface_max_y);
 257
 258         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 259                 DungeonGen dgen(this, NULL);
 260                 dgen.generate(blockseed, full_node_min, full_node_max);
 261         }
 262
 263         // Generate the registered decorations
 264         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 265
 266         // Generate the registered ores
 267         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 268
 269         // Sprinkle some dust on top after everything else was generated
 270         dustTopNodes();
 271
 272         //printf("makeChunk: %dms\n", t.stop());
 273
 274         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 275
 276         if (flags & MG_LIGHT)
 277                 calcLighting(node_min, node_max);
 278         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 279         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 280
 281         this->generating = false;
 282 }
 283
 284
 285 void MapgenV7::calculateNoise()
 286 {
 287         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 288         int x = node_min.X;
 289         int y = node_min.Y;
 290         int z = node_min.Z;
 291
 292         noise_terrain_persist->perlinMap2D(x, z);
 293         float *persistmap = noise_terrain_persist->result;
 294
 295         noise_terrain_base->perlinMap2D(x, z, persistmap);
 296         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 297         noise_height_select->perlinMap2D(x, z);
 298
 299         if (flags & MG_CAVES) {
 300                 noise_cave1->perlinMap3D(x, y, z);
 301                 noise_cave2->perlinMap3D(x, y, z);
 302         }
 303
 304         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 305                 noise_ridge->perlinMap3D(x, y, z);
 306                 noise_ridge_uwater->perlinMap2D(x, z);
 307         }
 308
 309         if ((spflags & MGV7_MOUNTAINS) && node_max.Y >= 0) {
 310                 noise_mountain->perlinMap3D(x, y, z);
 311                 noise_mount_height->perlinMap2D(x, z);
 312         }
 313
 314         if (node_max.Y >= water_level) {
 315                 noise_filler_depth->perlinMap2D(x, z);
 316                 noise_heat->perlinMap2D(x, z);
 317                 noise_humidity->perlinMap2D(x, z);
 318         }
 319         //printf("calculateNoise: %dus\n", t.stop());
 320 }
 321
 322
 323 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 324 {
 325         float heat      = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed);
 326         float humidity  = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed);
 327         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 328
 329         return bmgr->getBiome(heat, humidity, groundlevel);
 330 }
 331
 332 //needs to be updated
 333 float MapgenV7::baseTerrainLevelAtPoint(int x, int z)
 334 {
 335         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 336         hselect = rangelim(hselect, 0.0, 1.0);
 337
 338         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 339
 340         noise_terrain_base->np.persist = persist;
 341         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 342
 343         noise_terrain_alt->np.persist = persist;
 344         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 345
 346         if (height_alt > height_base)
 347                 return height_alt;
 348
 349         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 350 }
 351
 352
 353 float MapgenV7::baseTerrainLevelFromMap(int index)
 354 {
 355         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 356         float height_base = noise_terrain_base->result[index];
 357         float height_alt  = noise_terrain_alt->result[index];
 358
 359         if (height_alt > height_base)
 360                 return height_alt;
 361
 362         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 363 }
 364
 365
 366 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z)
 367 {
 368         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 369         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 370         return mnt_n * mnt_h_n >= (float)y;
 371 }
 372
 373
 374 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y)
 375 {
 376         float mounthn = noise_mount_height->result[idx_xz];
 377         float mountn = noise_mountain->result[idx_xyz];
 378         return mountn * mounthn >= (float)y;
 379 }
 380
 381
 382 #if 0
 383 void MapgenV7::carveRivers() {
 384         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 385         MapNode n_stone(c_stone);
 386         u32 index = 0;
 387
 388         int river_depth = 4;
 389
 390         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 391         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 392                 float terrain_mod  = noise_terrain_mod->result[index];
 393                 NoiseParams *np = noise_terrain_river->np;
 394                 np.persist = noise_terrain_persist->result[index];
 395                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 396                 float height = terrain_river * (1 - abs(terrain_mod)) *
 397                                                 noise_terrain_river->np.scale;
 398                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 399
 400                 s16 y = heightmap[index];
 401                 if (height < 1.0 && y > river_depth &&
 402                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 403
 404                         for (s16 ry = y; ry != y - river_depth; ry--) {
 405                                 u32 vi = vm->m_area.index(x, ry, z);
 406                                 vm->m_data[vi] = n_air;
 407                         }
 408
 409                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 410                         vm->m_data[vi] = n_water_source;
 411                 }
 412         }
 413 }
 414 #endif
 415
 416
 417 int MapgenV7::generateTerrain()
 418 {
 419         int ymax = generateBaseTerrain();
 420
 421         if (spflags & MGV7_MOUNTAINS)
 422                 ymax = generateMountainTerrain(ymax);
 423
 424         if (spflags & MGV7_RIDGES)
 425                 generateRidgeTerrain();
 426
 427         return ymax;
 428 }
 429
 430
 431 int MapgenV7::generateBaseTerrain()
 432 {
 433         MapNode n_air(CONTENT_AIR);
 434         MapNode n_stone(c_stone);
 435         MapNode n_water(c_water_source);
 436
 437         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 438         v3s16 em = vm->m_area.getExtent();
 439         u32 index = 0;
 440
 441         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 442         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 443                 float surface_height = baseTerrainLevelFromMap(index);
 444                 s16 surface_y = (s16)surface_height;
 445
 446                 heightmap[index]       = surface_y;
 447                 ridge_heightmap[index] = surface_y;
 448
 449                 if (surface_y > stone_surface_max_y)
 450                         stone_surface_max_y = surface_y;
 451
 452                 u32 i = vm->m_area.index(x, node_min.Y, z);
 453                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 454                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 455                                 if (y <= surface_y)
 456                                         vm->m_data[i] = n_stone;
 457                                 else if (y <= water_level)
 458                                         vm->m_data[i] = n_water;
 459                                 else
 460                                         vm->m_data[i] = n_air;
 461                         }
 462                         vm->m_area.add_y(em, i, 1);
 463                 }
 464         }
 465
 466         return stone_surface_max_y;
 467 }
 468
 469
 470 int MapgenV7::generateMountainTerrain(int ymax)
 471 {
 472         if (node_max.Y < 0)
 473                 return ymax;
 474
 475         MapNode n_stone(c_stone);
 476         u32 j = 0;
 477
 478         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 479         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 480                 u32 vi = vm->m_area.index(node_min.X, y, z);
 481                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 482                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 483                         content_t c = vm->m_data[vi].getContent();
 484
 485                         if (getMountainTerrainFromMap(j, index, y)
 486                                         && (c == CONTENT_AIR || c == c_water_source)) {
 487                                 vm->m_data[vi] = n_stone;
 488                                 if (y > ymax)
 489                                         ymax = y;
 490                         }
 491
 492                         vi++;
 493                         j++;
 494                 }
 495         }
 496
 497         return ymax;
 498 }
 499
 500
 501 void MapgenV7::generateRidgeTerrain()
 502 {
 503         if (node_max.Y < water_level)
 504                 return;
 505
 506         MapNode n_water(c_water_source);
 507         MapNode n_air(CONTENT_AIR);
 508         u32 index = 0;
 509         float width = 0.2; // TODO: figure out acceptable perlin noise values
 510
 511         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 512         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 513                 u32 vi = vm->m_area.index(node_min.X, y, z);
 514                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 515                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 516
 517                         if (heightmap[j] < water_level - 16)
 518                                 continue;
 519
 520                         float uwatern = noise_ridge_uwater->result[j] * 2;
 521                         if (fabs(uwatern) > width)
 522                                 continue;
 523
 524                         float altitude = y - water_level;
 525                         float height_mod = (altitude + 17) / 2.5;
 526                         float width_mod  = width - fabs(uwatern);
 527                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 528
 529                         if (nridge + width_mod * height_mod < 0.6)
 530                                 continue;
 531
 532                         if (y < ridge_heightmap[j])
 533                                 ridge_heightmap[j] = y - 1;
 534
 535                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 536                 }
 537         }
 538 }
 539
 540
 541 void MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 542 {
 543         if (node_max.Y < water_level)
 544                 return;
 545
 546         MapNode n_air(CONTENT_AIR);
 547         MapNode n_stone(c_stone);
 548         MapNode n_water(c_water_source);
 549
 550         v3s16 em = vm->m_area.getExtent();
 551         u32 index = 0;
 552
 553         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 554         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 555                 Biome *biome = NULL;
 556                 s16 dfiller = 0;
 557                 s16 y0_top = 0;
 558                 s16 y0_filler = 0;
 559                 s16 depth_water_top = 0;
 560
 561                 s16 nplaced = 0;
 562                 u32 i = vm->m_area.index(x, node_max.Y, z);
 563
 564                 content_t c_above = vm->m_data[i + em.X].getContent();
 565                 bool have_air = c_above == CONTENT_AIR;
 566
 567                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 568                         content_t c = vm->m_data[i].getContent();
 569
 570                         // It could be the case that the elevation is equal to the chunk
 571                         // boundary, but the chunk above has not been generated yet
 572                         if (y == node_max.Y && c_above == CONTENT_IGNORE &&
 573                                 y == heightmap[index] && c == c_stone) {
 574                                 int j = (z - node_min.Z) * zstride +
 575                                                 (y - node_min.Y) * ystride +
 576                                                 (x - node_min.X);
 577                                 have_air = !getMountainTerrainFromMap(j, index, y);
 578                         }
 579
 580                         if (c != CONTENT_IGNORE && c != CONTENT_AIR && (y == node_max.Y || have_air)) {
 581                                 biome           = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 582                                 dfiller         = biome->depth_filler + noise_filler_depth->result[index];
 583                                 y0_top          = biome->depth_top;
 584                                 y0_filler       = biome->depth_top + dfiller;
 585                                 depth_water_top = biome->depth_water_top;
 586                         }
 587
 588                         if (c == c_stone && have_air) {
 589                                 content_t c_below = vm->m_data[i - em.X].getContent();
 590
 591                                 if (c_below != CONTENT_AIR) {
 592                                         if (nplaced < y0_top) {
 593                                                 vm->m_data[i] = MapNode(biome->c_top);
 594                                                 nplaced++;
 595                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 596                                                 vm->m_data[i] = MapNode(biome->c_filler);
 597                                                 nplaced++;
 598                                         } else if (c == c_stone) {
 599                                                 have_air = false;
 600                                                 nplaced  = 0;
 601                                                 vm->m_data[i] = MapNode(biome->c_stone);
 602                                         } else {
 603                                                 have_air = false;
 604                                                 nplaced  = 0;
 605                                         }
 606                                 } else if (c == c_stone) {
 607                                         have_air = false;
 608                                         nplaced = 0;
 609                                         vm->m_data[i] = MapNode(biome->c_stone);
 610                                 }
 611                         } else if (c == c_stone) {
 612                                 have_air = false;
 613                                 nplaced = 0;
 614                                 vm->m_data[i] = MapNode(biome->c_stone);
 615                         } else if (c == c_water_source) {
 616                                 have_air = true;
 617                                 nplaced = 0;
 618                                 if(y > water_level - depth_water_top)
 619                                         vm->m_data[i] = MapNode(biome->c_water_top);
 620                                 else
 621                                         vm->m_data[i] = MapNode(biome->c_water);
 622                         } else if (c == CONTENT_AIR) {
 623                                 have_air = true;
 624                                 nplaced = 0;
 625                         }
 626
 627                         vm->m_area.add_y(em, i, -1);
 628                 }
 629         }
 630 }
 631
 632
 633 void MapgenV7::dustTopNodes()
 634 {
 635         if (node_max.Y < water_level)
 636                 return;
 637
 638         v3s16 em = vm->m_area.getExtent();
 639         u32 index = 0;
 640
 641         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 642         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 643                 Biome *biome = (Biome *)bmgr->get(biomemap[index]);
 644
 645                 if (biome->c_dust == CONTENT_IGNORE)
 646                         continue;
 647
 648                 s16 y = node_max.Y;
 649                 u32 vi = vm->m_area.index(x, y, z);
 650                 for (; y >= node_min.Y; y--) {
 651                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 652                                 break;
 653
 654                         vm->m_area.add_y(em, vi, -1);
 655                 }
 656
 657                 content_t c = vm->m_data[vi].getContent();
 658                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE) {
 659                         if (y == node_max.Y)
 660                                 continue;
 661
 662                         vm->m_area.add_y(em, vi, 1);
 663                         vm->m_data[vi] = MapNode(biome->c_dust);
 664                 }
 665         }
 666 }
 667
 668
 669 #if 0
 670 void MapgenV7::addTopNodes()
 671 {
 672         v3s16 em = vm->m_area.getExtent();
 673         s16 ntopnodes;
 674         u32 index = 0;
 675
 676         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 677         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 678                 Biome *biome = bmgr->biomes[biomemap[index]];
 679
 680                 //////////////////// First, add top nodes below the ridge
 681                 s16 y = ridge_heightmap[index];
 682
 683                 // This cutoff is good enough, but not perfect.
 684                 // It will cut off potentially placed top nodes at chunk boundaries
 685                 if (y < node_min.Y)
 686                         continue;
 687                 if (y > node_max.Y) {
 688                         y = node_max.Y; // Let's see if we can still go downward anyway
 689                         u32 vi = vm->m_area.index(x, y, z);
 690                         content_t c = vm->m_data[vi].getContent();
 691                         if (ndef->get(c).walkable)
 692                                 continue;
 693                 }
 694
 695                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 696                 // might not be the actual height, just the lowest part in the chunk
 697                 // where a ridge had been carved
 698                 u32 i = vm->m_area.index(x, y, z);
 699                 for (; y >= node_min.Y; y--) {
 700                         content_t c = vm->m_data[i].getContent();
 701                         if (ndef->get(c).walkable)
 702                                 break;
 703                         vm->m_area.add_y(em, i, -1);
 704                 }
 705
 706                 if (y != node_min.Y - 1 && y >= water_level) {
 707                         ridge_heightmap[index] = y; //update ridgeheight
 708                         ntopnodes = biome->top_depth;
 709                         for (; y <= node_max.Y && ntopnodes; y++) {
 710                                 ntopnodes--;
 711                                 vm->m_data[i] = MapNode(biome->c_top);
 712                                 vm->m_area.add_y(em, i, 1);
 713                         }
 714                         // If dirt, grow grass on it.
 715                         if (y > water_level - 10 &&
 716                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 717                                 vm->m_area.add_y(em, i, -1);
 718                                 if (vm->m_data[i].getContent() == c_dirt)
 719                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 720                         }
 721                 }
 722
 723                 //////////////////// Now, add top nodes on top of the ridge
 724                 y = heightmap[index];
 725                 if (y > node_max.Y) {
 726                         y = node_max.Y; // Let's see if we can still go downward anyway
 727                         u32 vi = vm->m_area.index(x, y, z);
 728                         content_t c = vm->m_data[vi].getContent();
 729                         if (ndef->get(c).walkable)
 730                                 continue;
 731                 }
 732
 733                 i = vm->m_area.index(x, y, z);
 734                 for (; y >= node_min.Y; y--) {
 735                         content_t c = vm->m_data[i].getContent();
 736                         if (ndef->get(c).walkable)
 737                                 break;
 738                         vm->m_area.add_y(em, i, -1);
 739                 }
 740
 741                 if (y != node_min.Y - 1) {
 742                         ntopnodes = biome->top_depth;
 743                         // Let's see if we've already added it...
 744                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 745                                 continue;
 746
 747                         for (; y <= node_max.Y && ntopnodes; y++) {
 748                                 ntopnodes--;
 749                                 vm->m_data[i] = MapNode(biome->c_top);
 750                                 vm->m_area.add_y(em, i, 1);
 751                         }
 752                         // If dirt, grow grass on it.
 753                         if (y > water_level - 10 &&
 754                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 755                                 vm->m_area.add_y(em, i, -1);
 756                                 if (vm->m_data[i].getContent() == c_dirt)
 757                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 758                         }
 759                 }
 760         }
 761 }
 762 #endif
 763
 764
 765 void MapgenV7::generateCaves(int max_stone_y)
 766 {
 767         if (max_stone_y >= node_min.Y) {
 768                 u32 index   = 0;
 769                 u32 index2d = 0;
 770
 771                 for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 772                         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 773                                 u32 i = vm->m_area.index(node_min.X, y, z);
 774                                 for (s16 x = node_min.X; x <= node_max.X;
 775                                                 x++, i++, index++, index2d++) {
 776                                         Biome *biome = (Biome *)bmgr->get(biomemap[index2d]);
 777                                         content_t c = vm->m_data[i].getContent();
 778                                         if (c == CONTENT_AIR || (y <= water_level &&
 779                                                 c != biome->c_stone && c != c_stone))
 780                                                 continue;
 781
 782                                         float d1 = contour(noise_cave1->result[index]);
 783                                         float d2 = contour(noise_cave2->result[index]);
 784                                         if (d1 * d2 > 0.3)
 785                                                 vm->m_data[i] = MapNode(CONTENT_AIR);
 786                                 }
 787                                 index2d -= ystride;
 788                         }
 789                         index2d += ystride;
 790                 }
 791         }
 792
 793         PseudoRandom ps(blockseed + 21343);
 794         u32 bruises_count = (ps.range(1, 5) == 1) ? ps.range(1, 2) : 0;
 795         for (u32 i = 0; i < bruises_count; i++) {
 796                 CaveV7 cave(this, &ps);
 797                 cave.makeCave(node_min, node_max, max_stone_y);
 798         }
 799 }
 800