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