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         this->generating  = false;
  54         this->id     = mapgenid;
  55         this->emerge = emerge;
  56         this->bmgr   = emerge->biomedef;
  57
  58         this->seed        = (int)params->seed;
  59         this->water_level = params->water_level;
  60         this->flags       = params->flags;
  61         this->gennotify   = emerge->gennotify;
  62
  63         this->csize   = v3s16(1, 1, 1) * params->chunksize * MAP_BLOCKSIZE;
  64
  65         //// amount of elements to skip for the next index
  66         //// for noise/height/biome maps (not vmanip)
  67         this->ystride = csize.X;
  68         this->zstride = csize.X * csize.Y;
  69
  70         this->biomemap  = new u8[csize.X * csize.Z];
  71         this->heightmap = new s16[csize.X * csize.Z];
  72         this->ridge_heightmap = new s16[csize.X * csize.Z];
  73
  74         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  75
  76         //// Terrain noise
  77         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  78         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  79         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  80         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  81         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  82         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  83         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  84
  85         //// 3d terrain noise
  86         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y, csize.Z);
  87         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y, csize.Z);
  88
  89         //// Biome noise
  90         noise_heat     = new Noise(bmgr->np_heat,     seed, csize.X, csize.Z);
  91         noise_humidity = new Noise(bmgr->np_humidity, seed, csize.X, csize.Z);
  92
  93         //// Resolve nodes to be used
  94         INodeDefManager *ndef = emerge->ndef;
  95
  96         c_stone           = ndef->getId("mapgen_stone");
  97         c_dirt            = ndef->getId("mapgen_dirt");
  98         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  99         c_sand            = ndef->getId("mapgen_sand");
 100         c_water_source    = ndef->getId("mapgen_water_source");
 101         c_lava_source     = ndef->getId("mapgen_lava_source");
 102         c_ice             = ndef->getId("default:ice");
 103         if (c_ice == CONTENT_IGNORE)
 104                 c_ice = CONTENT_AIR;
 105 }
 106
 107
 108 MapgenV7::~MapgenV7() {
 109         delete noise_terrain_base;
 110         delete noise_terrain_persist;
 111         delete noise_height_select;
 112         delete noise_terrain_alt;
 113         delete noise_filler_depth;
 114         delete noise_mount_height;
 115         delete noise_ridge_uwater;
 116         delete noise_mountain;
 117         delete noise_ridge;
 118
 119         delete noise_heat;
 120         delete noise_humidity;
 121
 122         delete[] ridge_heightmap;
 123         delete[] heightmap;
 124         delete[] biomemap;
 125 }
 126
 127
 128 MapgenV7Params::MapgenV7Params() {
 129         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 130
 131         np_terrain_base    = NoiseParams(4,    70,  v3f(300, 300, 300), 82341, 6, 0.7);
 132         np_terrain_alt     = NoiseParams(4,    25,  v3f(600, 600, 600), 5934,  5, 0.6);
 133         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500, 500, 500), 539,   3, 0.6);
 134         np_height_select   = NoiseParams(-0.5, 1,   v3f(250, 250, 250), 4213,  5, 0.69);
 135         np_filler_depth    = NoiseParams(0,    1.2, v3f(150, 150, 150), 261,   4, 0.7);
 136         np_mount_height    = NoiseParams(100,  30,  v3f(500, 500, 500), 72449, 4, 0.6);
 137         np_ridge_uwater    = NoiseParams(0,    1,   v3f(500, 500, 500), 85039, 4, 0.6);
 138         np_mountain        = NoiseParams(0,    1,   v3f(250, 350, 250), 5333,  5, 0.68);
 139         np_ridge           = NoiseParams(0,    1,   v3f(100, 100, 100), 6467,  4, 0.75);
 140 }
 141
 142
 143 void MapgenV7Params::readParams(Settings *settings) {
 144         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 145
 146         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 147         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 148         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 149         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 150         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 151         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 152         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 153         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 154         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 155 }
 156
 157
 158 void MapgenV7Params::writeParams(Settings *settings) {
 159         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 160
 161         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 162         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 163         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 164         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 165         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 166         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 167         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 168         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 169         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 170 }
 171
 172
 173 ///////////////////////////////////////
 174
 175
 176 int MapgenV7::getGroundLevelAtPoint(v2s16 p) {
 177         // Base terrain calculation
 178         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 179
 180         // Ridge/river terrain calculation
 181         float width = 0.3;
 182         float uwatern = NoisePerlin2DNoTxfm(noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 183         // actually computing the depth of the ridge is much more expensive;
 184         // if inside a river, simply guess
 185         if (uwatern >= -width && uwatern <= width)
 186                 return water_level - 10;
 187
 188         // Mountain terrain calculation
 189         int iters = 128; // don't even bother iterating more than 128 times..
 190         while (iters--) {
 191                 //current point would have been air
 192                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 193                         return y;
 194
 195                 y++;
 196         }
 197
 198         return y;
 199 }
 200
 201
 202 void MapgenV7::makeChunk(BlockMakeData *data) {
 203         assert(data->vmanip);
 204         assert(data->nodedef);
 205         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 206                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 207                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 208         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 209                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 210                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 211
 212         this->generating = true;
 213         this->vm   = data->vmanip;
 214         this->ndef = data->nodedef;
 215         //TimeTaker t("makeChunk");
 216
 217         v3s16 blockpos_min = data->blockpos_min;
 218         v3s16 blockpos_max = data->blockpos_max;
 219         node_min = blockpos_min * MAP_BLOCKSIZE;
 220         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 221         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 222         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 223
 224         blockseed = emerge->getBlockSeed(full_node_min);  //////use getBlockSeed2()!
 225
 226         // Make some noise
 227         calculateNoise();
 228
 229         // Generate base terrain, mountains, and ridges with initial heightmaps
 230         s16 stone_surface_max_y = generateTerrain();
 231
 232         updateHeightmap(node_min, node_max);
 233
 234         // Calculate biomes
 235         BiomeNoiseInput binput;
 236         binput.mapsize      = v2s16(csize.X, csize.Z);
 237         binput.heat_map     = noise_heat->result;
 238         binput.humidity_map = noise_humidity->result;
 239         binput.height_map   = heightmap;
 240         bmgr->calcBiomes(&binput, biomemap);
 241
 242         // Actually place the biome-specific nodes and what not
 243         generateBiomes();
 244
 245         if (flags & MG_CAVES)
 246                 generateCaves(stone_surface_max_y);
 247
 248         if (flags & MG_DUNGEONS) {
 249                 DungeonGen dgen(this, NULL);
 250                 dgen.generate(blockseed, full_node_min, full_node_max);
 251         }
 252
 253         for (size_t i = 0; i != emerge->decorations.size(); i++) {
 254                 Decoration *deco = emerge->decorations[i];
 255                 deco->placeDeco(this, blockseed + i, node_min, node_max);
 256         }
 257
 258         for (size_t i = 0; i != emerge->ores.size(); i++) {
 259                 Ore *ore = emerge->ores[i];
 260                 ore->placeOre(this, blockseed + i, node_min, node_max);
 261         }
 262
 263         // Sprinkle some dust on top after everything else was generated
 264         dustTopNodes();
 265
 266         //printf("makeChunk: %dms\n", t.stop());
 267
 268         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 269
 270         if (flags & MG_LIGHT)
 271                 calcLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 272                                          node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE);
 273         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 274         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 275
 276         this->generating = false;
 277 }
 278
 279
 280 void MapgenV7::calculateNoise() {
 281         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 282         int x = node_min.X;
 283         int y = node_min.Y;
 284         int z = node_min.Z;
 285
 286         noise_height_select->perlinMap2D(x, z);
 287         noise_height_select->transformNoiseMap();
 288
 289         noise_terrain_persist->perlinMap2D(x, z);
 290         noise_terrain_persist->transformNoiseMap();
 291         float *persistmap = noise_terrain_persist->result;
 292         for (int i = 0; i != csize.X * csize.Z; i++)
 293                 persistmap[i] = rangelim(persistmap[i], 0.4, 0.9);
 294
 295         noise_terrain_base->perlinMap2DModulated(x, z, persistmap);
 296         noise_terrain_base->transformNoiseMap();
 297
 298         noise_terrain_alt->perlinMap2DModulated(x, z, persistmap);
 299         noise_terrain_alt->transformNoiseMap();
 300
 301         noise_filler_depth->perlinMap2D(x, z);
 302
 303         if (spflags & MGV7_MOUNTAINS) {
 304                 noise_mountain->perlinMap3D(x, y, z);
 305                 noise_mount_height->perlinMap2D(x, z);
 306                 noise_mount_height->transformNoiseMap();
 307         }
 308
 309         if (spflags & MGV7_RIDGES) {
 310                 noise_ridge->perlinMap3D(x, y, z);
 311                 noise_ridge_uwater->perlinMap2D(x, z);
 312         }
 313
 314         noise_heat->perlinMap2D(x, z);
 315         noise_humidity->perlinMap2D(x, z);
 316
 317         //printf("calculateNoise: %dus\n", t.stop());
 318 }
 319
 320
 321 Biome *MapgenV7::getBiomeAtPoint(v3s16 p) {
 322         float heat      = NoisePerlin2D(bmgr->np_heat, p.X, p.Z, seed);
 323         float humidity  = NoisePerlin2D(bmgr->np_humidity, 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         float hselect = NoisePerlin2D(noise_height_select->np, x, z, seed);
 332         hselect = rangelim(hselect, 0.0, 1.0);
 333
 334         float persist = NoisePerlin2D(noise_terrain_persist->np, x, z, seed);
 335         persist = rangelim(persist, 0.4, 0.9);
 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         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 352         float height_base = noise_terrain_base->result[index];
 353         float height_alt  = noise_terrain_alt->result[index];
 354
 355         if (height_alt > height_base)
 356                 return height_alt;
 357
 358         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 359 }
 360
 361
 362 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z) {
 363         float mnt_h_n = NoisePerlin2D(noise_mount_height->np, x, z, seed);
 364         float height_modifier = -((float)y / rangelim(mnt_h_n, 80.0, 150.0));
 365         float mnt_n = NoisePerlin3D(noise_mountain->np, x, y, z, seed);
 366
 367         return mnt_n + height_modifier >= 0.6;
 368 }
 369
 370
 371 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y) {
 372         float mounthn = noise_mount_height->result[idx_xz];
 373         float height_modifier = -((float)y / rangelim(mounthn, 80.0, 150.0));
 374         return (noise_mountain->result[idx_xyz] + height_modifier >= 0.6);
 375 }
 376
 377
 378 #if 0
 379 void MapgenV7::carveRivers() {
 380         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 381         MapNode n_stone(c_stone);
 382         u32 index = 0;
 383
 384         int river_depth = 4;
 385
 386         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 387         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 388                 float terrain_mod  = noise_terrain_mod->result[index];
 389                 NoiseParams *np = noise_terrain_river->np;
 390                 np->persist = noise_terrain_persist->result[index];
 391                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 392                 float height = terrain_river * (1 - abs(terrain_mod)) *
 393                                                 noise_terrain_river->np->scale;
 394                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 395
 396                 s16 y = heightmap[index];
 397                 if (height < 1.0 && y > river_depth &&
 398                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 399
 400                         for (s16 ry = y; ry != y - river_depth; ry--) {
 401                                 u32 vi = vm->m_area.index(x, ry, z);
 402                                 vm->m_data[vi] = n_air;
 403                         }
 404
 405                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 406                         vm->m_data[vi] = n_water_source;
 407                 }
 408         }
 409 }
 410 #endif
 411
 412
 413 int MapgenV7::generateTerrain() {
 414         int ymax = generateBaseTerrain();
 415
 416         if (spflags & MGV7_MOUNTAINS)
 417                 generateMountainTerrain();
 418
 419         if (spflags & MGV7_RIDGES)
 420                 generateRidgeTerrain();
 421
 422         return ymax;
 423 }
 424
 425
 426 int MapgenV7::generateBaseTerrain() {
 427         MapNode n_air(CONTENT_AIR);
 428         MapNode n_stone(c_stone);
 429         MapNode n_water(c_water_source);
 430
 431         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 432         v3s16 em = vm->m_area.getExtent();
 433         u32 index = 0;
 434
 435         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 436         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 437                 float surface_height = baseTerrainLevelFromMap(index);
 438                 s16 surface_y = (s16)surface_height;
 439
 440                 heightmap[index]       = surface_y;
 441                 ridge_heightmap[index] = surface_y;
 442
 443                 if (surface_y > stone_surface_max_y)
 444                         stone_surface_max_y = surface_y;
 445
 446                 u32 i = vm->m_area.index(x, node_min.Y, z);
 447                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 448                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 449                                 if (y <= surface_y)
 450                                         vm->m_data[i] = n_stone;
 451                                 else if (y <= water_level)
 452                                         vm->m_data[i] = n_water;
 453                                 else
 454                                         vm->m_data[i] = n_air;
 455                         }
 456                         vm->m_area.add_y(em, i, 1);
 457                 }
 458         }
 459
 460         return stone_surface_max_y;
 461 }
 462
 463
 464 void MapgenV7::generateMountainTerrain() {
 465         if (node_max.Y <= water_level)
 466                 return;
 467
 468         MapNode n_stone(c_stone);
 469         u32 j = 0;
 470
 471         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 472         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 473                 u32 vi = vm->m_area.index(node_min.X, y, z);
 474                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 475                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 476
 477                         if (getMountainTerrainFromMap(j, index, y))
 478                                 vm->m_data[vi] = n_stone;
 479
 480                         vi++;
 481                         j++;
 482                 }
 483         }
 484 }
 485
 486
 487 void MapgenV7::generateRidgeTerrain() {
 488         MapNode n_water(c_water_source);
 489         MapNode n_air(CONTENT_AIR);
 490         u32 index = 0;
 491
 492         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 493         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 494                 u32 vi = vm->m_area.index(node_min.X, y, z);
 495                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 496                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 497
 498                         if (heightmap[j] < water_level - 4)
 499                                 continue;
 500
 501                         float widthn = (noise_terrain_persist->result[j] - 0.6) / 0.1;
 502                         //widthn = rangelim(widthn, -0.05, 0.5);
 503
 504                         float width = 0.3; // TODO: figure out acceptable perlin noise values
 505                         float uwatern = noise_ridge_uwater->result[j] * 2;
 506                         if (uwatern < -width || uwatern > width)
 507                                 continue;
 508
 509                         float height_mod = (float)(y + 17) / 2.5;
 510                         float width_mod  = (width - fabs(uwatern));
 511                         float nridge = noise_ridge->result[index] * (float)y / 7.0;
 512
 513                         if (y < water_level)
 514                                 nridge = -fabs(nridge) * 3.0 * widthn * 0.3;
 515
 516                         if (nridge + width_mod * height_mod < 0.6)
 517                                 continue;
 518
 519                         if (y < ridge_heightmap[j])
 520                                 ridge_heightmap[j] = y - 1;
 521
 522                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 523                 }
 524         }
 525 }
 526
 527
 528 void MapgenV7::generateBiomes() {
 529         if (node_max.Y < water_level)
 530                 return;
 531
 532         MapNode n_air(CONTENT_AIR);
 533         MapNode n_stone(c_stone);
 534         MapNode n_water(c_water_source);
 535
 536         v3s16 em = vm->m_area.getExtent();
 537         u32 index = 0;
 538
 539         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 540         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 541                 Biome *biome  = bmgr->biomes[biomemap[index]];
 542                 s16 dfiller   = biome->depth_filler + noise_filler_depth->result[index];
 543                 s16 y0_top    = biome->depth_top;
 544                 s16 y0_filler = biome->depth_filler + biome->depth_top + dfiller;
 545
 546                 s16 nplaced = 0;
 547                 u32 i = vm->m_area.index(x, node_max.Y, z);
 548
 549                 content_t c_above = vm->m_data[i + em.X].getContent();
 550                 bool have_air = c_above == CONTENT_AIR;
 551
 552                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 553                         content_t c = vm->m_data[i].getContent();
 554
 555                         // It could be the case that the elevation is equal to the chunk
 556                         // boundary, but the chunk above has not been generated yet
 557                         if (y == node_max.Y && c_above == CONTENT_IGNORE &&
 558                                 y == heightmap[index] && c == c_stone) {
 559                                 int j = (z - node_min.Z) * zstride +
 560                                                 (y - node_min.Y) * ystride +
 561                                                 (x - node_min.X);
 562                                 have_air = !getMountainTerrainFromMap(j, index, y);
 563                         }
 564
 565                         if (c == c_stone && have_air) {
 566                                 content_t c_below = vm->m_data[i - em.X].getContent();
 567
 568                                 if (c_below != CONTENT_AIR) {
 569                                         if (nplaced < y0_top) {
 570                                                 // A hack to prevent dirt_with_grass from being
 571                                                 // placed below water.  TODO: fix later
 572                                                 content_t c_place = ((y < water_level) &&
 573                                                                 (biome->c_top == c_dirt_with_grass)) ?
 574                                                                  c_dirt : biome->c_top;
 575
 576                                                 vm->m_data[i] = MapNode(c_place);
 577                                                 nplaced++;
 578                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 579                                                 vm->m_data[i] = MapNode(biome->c_filler);
 580                                                 nplaced++;
 581                                         } else {
 582                                                 have_air = false;
 583                                                 nplaced  = 0;
 584                                         }
 585                                 }
 586                         } else if (c == c_water_source) {
 587                                 have_air = true;
 588                                 nplaced = 0;
 589                                 vm->m_data[i] = MapNode(biome->c_water);
 590                         } else if (c == CONTENT_AIR) {
 591                                 have_air = true;
 592                                 nplaced = 0;
 593                         }
 594
 595                         vm->m_area.add_y(em, i, -1);
 596                 }
 597         }
 598 }
 599
 600
 601 void MapgenV7::dustTopNodes() {
 602         v3s16 em = vm->m_area.getExtent();
 603         u32 index = 0;
 604
 605         if (water_level > node_max.Y)
 606                 return;
 607
 608         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 609         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 610                 Biome *biome = bmgr->biomes[biomemap[index]];
 611
 612                 if (biome->c_dust == CONTENT_IGNORE)
 613                         continue;
 614
 615                 s16 y = node_max.Y;
 616                 u32 vi = vm->m_area.index(x, y, z);
 617                 for (; y >= node_min.Y; y--) {
 618                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 619                                 break;
 620
 621                         vm->m_area.add_y(em, vi, -1);
 622                 }
 623
 624                 content_t c = vm->m_data[vi].getContent();
 625                 if (c == biome->c_water && biome->c_dust_water != CONTENT_IGNORE) {
 626                         if (y < node_min.Y)
 627                                 continue;
 628
 629                         vm->m_data[vi] = MapNode(biome->c_dust_water);
 630                 } else if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE) {
 631                         if (y == node_max.Y)
 632                                 continue;
 633
 634                         vm->m_area.add_y(em, vi, 1);
 635                         vm->m_data[vi] = MapNode(biome->c_dust);
 636                 }
 637         }
 638 }
 639
 640
 641 #if 0
 642 void MapgenV7::addTopNodes() {
 643         v3s16 em = vm->m_area.getExtent();
 644         s16 ntopnodes;
 645         u32 index = 0;
 646
 647         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 648         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 649                 Biome *biome = bmgr->biomes[biomemap[index]];
 650
 651                 //////////////////// First, add top nodes below the ridge
 652                 s16 y = ridge_heightmap[index];
 653
 654                 // This cutoff is good enough, but not perfect.
 655                 // It will cut off potentially placed top nodes at chunk boundaries
 656                 if (y < node_min.Y)
 657                         continue;
 658                 if (y > node_max.Y) {
 659                         y = node_max.Y; // Let's see if we can still go downward anyway
 660                         u32 vi = vm->m_area.index(x, y, z);
 661                         content_t c = vm->m_data[vi].getContent();
 662                         if (ndef->get(c).walkable)
 663                                 continue;
 664                 }
 665
 666                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 667                 // might not be the actual height, just the lowest part in the chunk
 668                 // where a ridge had been carved
 669                 u32 i = vm->m_area.index(x, y, z);
 670                 for (; y >= node_min.Y; y--) {
 671                         content_t c = vm->m_data[i].getContent();
 672                         if (ndef->get(c).walkable)
 673                                 break;
 674                         vm->m_area.add_y(em, i, -1);
 675                 }
 676
 677                 if (y != node_min.Y - 1 && y >= water_level) {
 678                         ridge_heightmap[index] = y; //update ridgeheight
 679                         ntopnodes = biome->top_depth;
 680                         for (; y <= node_max.Y && ntopnodes; y++) {
 681                                 ntopnodes--;
 682                                 vm->m_data[i] = MapNode(biome->c_top);
 683                                 vm->m_area.add_y(em, i, 1);
 684                         }
 685                         // If dirt, grow grass on it.
 686                         if (y > water_level - 10 &&
 687                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 688                                 vm->m_area.add_y(em, i, -1);
 689                                 if (vm->m_data[i].getContent() == c_dirt)
 690                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 691                         }
 692                 }
 693
 694                 //////////////////// Now, add top nodes on top of the ridge
 695                 y = heightmap[index];
 696                 if (y > node_max.Y) {
 697                         y = node_max.Y; // Let's see if we can still go downward anyway
 698                         u32 vi = vm->m_area.index(x, y, z);
 699                         content_t c = vm->m_data[vi].getContent();
 700                         if (ndef->get(c).walkable)
 701                                 continue;
 702                 }
 703
 704                 i = vm->m_area.index(x, y, z);
 705                 for (; y >= node_min.Y; y--) {
 706                         content_t c = vm->m_data[i].getContent();
 707                         if (ndef->get(c).walkable)
 708                                 break;
 709                         vm->m_area.add_y(em, i, -1);
 710                 }
 711
 712                 if (y != node_min.Y - 1) {
 713                         ntopnodes = biome->top_depth;
 714                         // Let's see if we've already added it...
 715                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 716                                 continue;
 717
 718                         for (; y <= node_max.Y && ntopnodes; y++) {
 719                                 ntopnodes--;
 720                                 vm->m_data[i] = MapNode(biome->c_top);
 721                                 vm->m_area.add_y(em, i, 1);
 722                         }
 723                         // If dirt, grow grass on it.
 724                         if (y > water_level - 10 &&
 725                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 726                                 vm->m_area.add_y(em, i, -1);
 727                                 if (vm->m_data[i].getContent() == c_dirt)
 728                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 729                         }
 730                 }
 731         }
 732 }
 733 #endif
 734
 735
 736 NoiseParams nparams_v7_def_cave(6, 6.0, v3f(250.0, 250.0, 250.0), 34329, 3, 0.50);
 737
 738 void MapgenV7::generateCaves(int max_stone_y) {
 739         PseudoRandom ps(blockseed + 21343);
 740
 741         int volume_nodes = (node_max.X - node_min.X + 1) *
 742                                            (node_max.Y - node_min.Y + 1) *
 743                                            (node_max.Z - node_min.Z + 1);
 744         float cave_amount = NoisePerlin2D(&nparams_v7_def_cave,
 745                                                                 node_min.X, node_min.Y, seed);
 746
 747         u32 caves_count = MYMAX(0.0, cave_amount) * volume_nodes / 250000;
 748         for (u32 i = 0; i < caves_count; i++) {
 749                 CaveV7 cave(this, &ps, false);
 750                 cave.makeCave(node_min, node_max, max_stone_y);
 751         }
 752
 753         u32 bruises_count = (ps.range(1, 8) == 1) ? ps.range(0, ps.range(0, 2)) : 1;
 754         for (u32 i = 0; i < bruises_count; i++) {
 755                 CaveV7 cave(this, &ps, true);
 756                 cave.makeCave(node_min, node_max, max_stone_y);
 757         }
 758 }