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->biomemgr;
  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         this->spflags = sp->spflags;
  76
  77         //// Terrain noise
  78         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  79         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  80         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  81         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  82         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  83         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  84         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  85
  86         //// 3d terrain noise
  87         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y, csize.Z);
  88         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y, csize.Z);
  89
  90         //// Biome noise
  91         noise_heat     = new Noise(bmgr->np_heat,     seed, csize.X, csize.Z);
  92         noise_humidity = new Noise(bmgr->np_humidity, seed, csize.X, csize.Z);
  93
  94         //// Resolve nodes to be used
  95         INodeDefManager *ndef = emerge->ndef;
  96
  97         c_stone           = ndef->getId("mapgen_stone");
  98         c_dirt            = ndef->getId("mapgen_dirt");
  99         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
 100         c_sand            = ndef->getId("mapgen_sand");
 101         c_water_source    = ndef->getId("mapgen_water_source");
 102         c_lava_source     = ndef->getId("mapgen_lava_source");
 103         c_ice             = ndef->getId("default:ice");
 104         if (c_ice == CONTENT_IGNORE)
 105                 c_ice = CONTENT_AIR;
 106 }
 107
 108
 109 MapgenV7::~MapgenV7() {
 110         delete noise_terrain_base;
 111         delete noise_terrain_persist;
 112         delete noise_height_select;
 113         delete noise_terrain_alt;
 114         delete noise_filler_depth;
 115         delete noise_mount_height;
 116         delete noise_ridge_uwater;
 117         delete noise_mountain;
 118         delete noise_ridge;
 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         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 131
 132         np_terrain_base    = NoiseParams(4,    70,  v3f(300, 300, 300), 82341, 6, 0.7);
 133         np_terrain_alt     = NoiseParams(4,    25,  v3f(600, 600, 600), 5934,  5, 0.6);
 134         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500, 500, 500), 539,   3, 0.6);
 135         np_height_select   = NoiseParams(-0.5, 1,   v3f(250, 250, 250), 4213,  5, 0.69);
 136         np_filler_depth    = NoiseParams(0,    1.2, v3f(150, 150, 150), 261,   4, 0.7);
 137         np_mount_height    = NoiseParams(100,  30,  v3f(500, 500, 500), 72449, 4, 0.6);
 138         np_ridge_uwater    = NoiseParams(0,    1,   v3f(500, 500, 500), 85039, 4, 0.6);
 139         np_mountain        = NoiseParams(0,    1,   v3f(250, 350, 250), 5333,  5, 0.68);
 140         np_ridge           = NoiseParams(0,    1,   v3f(100, 100, 100), 6467,  4, 0.75);
 141 }
 142
 143
 144 void MapgenV7Params::readParams(Settings *settings) {
 145         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 146
 147         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 148         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 149         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 150         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 151         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 152         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 153         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 154         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 155         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 156 }
 157
 158
 159 void MapgenV7Params::writeParams(Settings *settings) {
 160         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 161
 162         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 163         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 164         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 165         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 166         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 167         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 168         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 169         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 170         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 171 }
 172
 173
 174 ///////////////////////////////////////
 175
 176
 177 int MapgenV7::getGroundLevelAtPoint(v2s16 p) {
 178         // Base terrain calculation
 179         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 180
 181         // Ridge/river terrain calculation
 182         float width = 0.3;
 183         float uwatern = NoisePerlin2DNoTxfm(noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 184         // actually computing the depth of the ridge is much more expensive;
 185         // if inside a river, simply guess
 186         if (uwatern >= -width && uwatern <= width)
 187                 return water_level - 10;
 188
 189         // Mountain terrain calculation
 190         int iters = 128; // don't even bother iterating more than 128 times..
 191         while (iters--) {
 192                 //current point would have been air
 193                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 194                         return y;
 195
 196                 y++;
 197         }
 198
 199         return y;
 200 }
 201
 202
 203 void MapgenV7::makeChunk(BlockMakeData *data) {
 204         assert(data->vmanip);
 205         assert(data->nodedef);
 206         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 207                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 208                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 209         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 210                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 211                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 212
 213         this->generating = true;
 214         this->vm   = data->vmanip;
 215         this->ndef = data->nodedef;
 216         //TimeTaker t("makeChunk");
 217
 218         v3s16 blockpos_min = data->blockpos_min;
 219         v3s16 blockpos_max = data->blockpos_max;
 220         node_min = blockpos_min * MAP_BLOCKSIZE;
 221         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 222         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 223         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 224
 225         blockseed = emerge->getBlockSeed(full_node_min);  //////use getBlockSeed2()!
 226
 227         // Make some noise
 228         calculateNoise();
 229
 230         // Generate base terrain, mountains, and ridges with initial heightmaps
 231         s16 stone_surface_max_y = generateTerrain();
 232
 233         updateHeightmap(node_min, node_max);
 234
 235         // Calculate biomes
 236         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 237                 noise_humidity->result, heightmap, biomemap);
 238
 239         // Actually place the biome-specific nodes and what not
 240         generateBiomes();
 241
 242         if (flags & MG_CAVES)
 243                 generateCaves(stone_surface_max_y);
 244
 245         if (flags & MG_DUNGEONS) {
 246                 DungeonGen dgen(this, NULL);
 247                 dgen.generate(blockseed, full_node_min, full_node_max);
 248         }
 249
 250         // Generate the registered decorations
 251         emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 252
 253         // Generate the registered ores
 254         emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 255
 256         // Sprinkle some dust on top after everything else was generated
 257         dustTopNodes();
 258
 259         //printf("makeChunk: %dms\n", t.stop());
 260
 261         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 262
 263         if (flags & MG_LIGHT)
 264                 calcLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 265                                          node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE);
 266         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 267         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 268
 269         this->generating = false;
 270 }
 271
 272
 273 void MapgenV7::calculateNoise() {
 274         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 275         int x = node_min.X;
 276         int y = node_min.Y;
 277         int z = node_min.Z;
 278
 279         noise_height_select->perlinMap2D(x, z);
 280         noise_height_select->transformNoiseMap();
 281
 282         noise_terrain_persist->perlinMap2D(x, z);
 283         noise_terrain_persist->transformNoiseMap();
 284         float *persistmap = noise_terrain_persist->result;
 285         for (int i = 0; i != csize.X * csize.Z; i++)
 286                 persistmap[i] = rangelim(persistmap[i], 0.4, 0.9);
 287
 288         noise_terrain_base->perlinMap2DModulated(x, z, persistmap);
 289         noise_terrain_base->transformNoiseMap();
 290
 291         noise_terrain_alt->perlinMap2DModulated(x, z, persistmap);
 292         noise_terrain_alt->transformNoiseMap();
 293
 294         noise_filler_depth->perlinMap2D(x, z);
 295
 296         if (spflags & MGV7_MOUNTAINS) {
 297                 noise_mountain->perlinMap3D(x, y, z);
 298                 noise_mount_height->perlinMap2D(x, z);
 299                 noise_mount_height->transformNoiseMap();
 300         }
 301
 302         if (spflags & MGV7_RIDGES) {
 303                 noise_ridge->perlinMap3D(x, y, z);
 304                 noise_ridge_uwater->perlinMap2D(x, z);
 305         }
 306
 307         noise_heat->perlinMap2D(x, z);
 308         noise_humidity->perlinMap2D(x, z);
 309
 310         //printf("calculateNoise: %dus\n", t.stop());
 311 }
 312
 313
 314 Biome *MapgenV7::getBiomeAtPoint(v3s16 p) {
 315         float heat      = NoisePerlin2D(bmgr->np_heat, p.X, p.Z, seed);
 316         float humidity  = NoisePerlin2D(bmgr->np_humidity, p.X, p.Z, seed);
 317         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 318
 319         return bmgr->getBiome(heat, humidity, groundlevel);
 320 }
 321
 322 //needs to be updated
 323 float MapgenV7::baseTerrainLevelAtPoint(int x, int z) {
 324         float hselect = NoisePerlin2D(noise_height_select->np, x, z, seed);
 325         hselect = rangelim(hselect, 0.0, 1.0);
 326
 327         float persist = NoisePerlin2D(noise_terrain_persist->np, x, z, seed);
 328         persist = rangelim(persist, 0.4, 0.9);
 329
 330         noise_terrain_base->np->persist = persist;
 331         float height_base = NoisePerlin2D(noise_terrain_base->np, x, z, seed);
 332
 333         noise_terrain_alt->np->persist = persist;
 334         float height_alt = NoisePerlin2D(noise_terrain_alt->np, x, z, seed);
 335
 336         if (height_alt > height_base)
 337                 return height_alt;
 338
 339         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 340 }
 341
 342
 343 float MapgenV7::baseTerrainLevelFromMap(int index) {
 344         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 345         float height_base = noise_terrain_base->result[index];
 346         float height_alt  = noise_terrain_alt->result[index];
 347
 348         if (height_alt > height_base)
 349                 return height_alt;
 350
 351         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 352 }
 353
 354
 355 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z) {
 356         float mnt_h_n = NoisePerlin2D(noise_mount_height->np, x, z, seed);
 357         float height_modifier = -((float)y / rangelim(mnt_h_n, 80.0, 150.0));
 358         float mnt_n = NoisePerlin3D(noise_mountain->np, x, y, z, seed);
 359
 360         return mnt_n + height_modifier >= 0.6;
 361 }
 362
 363
 364 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y) {
 365         float mounthn = noise_mount_height->result[idx_xz];
 366         float height_modifier = -((float)y / rangelim(mounthn, 80.0, 150.0));
 367         return (noise_mountain->result[idx_xyz] + height_modifier >= 0.6);
 368 }
 369
 370
 371 #if 0
 372 void MapgenV7::carveRivers() {
 373         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 374         MapNode n_stone(c_stone);
 375         u32 index = 0;
 376
 377         int river_depth = 4;
 378
 379         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 380         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 381                 float terrain_mod  = noise_terrain_mod->result[index];
 382                 NoiseParams *np = noise_terrain_river->np;
 383                 np->persist = noise_terrain_persist->result[index];
 384                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 385                 float height = terrain_river * (1 - abs(terrain_mod)) *
 386                                                 noise_terrain_river->np->scale;
 387                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 388
 389                 s16 y = heightmap[index];
 390                 if (height < 1.0 && y > river_depth &&
 391                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 392
 393                         for (s16 ry = y; ry != y - river_depth; ry--) {
 394                                 u32 vi = vm->m_area.index(x, ry, z);
 395                                 vm->m_data[vi] = n_air;
 396                         }
 397
 398                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 399                         vm->m_data[vi] = n_water_source;
 400                 }
 401         }
 402 }
 403 #endif
 404
 405
 406 int MapgenV7::generateTerrain() {
 407         int ymax = generateBaseTerrain();
 408
 409         if (spflags & MGV7_MOUNTAINS)
 410                 generateMountainTerrain();
 411
 412         if (spflags & MGV7_RIDGES)
 413                 generateRidgeTerrain();
 414
 415         return ymax;
 416 }
 417
 418
 419 int MapgenV7::generateBaseTerrain() {
 420         MapNode n_air(CONTENT_AIR);
 421         MapNode n_stone(c_stone);
 422         MapNode n_water(c_water_source);
 423
 424         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 425         v3s16 em = vm->m_area.getExtent();
 426         u32 index = 0;
 427
 428         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 429         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 430                 float surface_height = baseTerrainLevelFromMap(index);
 431                 s16 surface_y = (s16)surface_height;
 432
 433                 heightmap[index]       = surface_y;
 434                 ridge_heightmap[index] = surface_y;
 435
 436                 if (surface_y > stone_surface_max_y)
 437                         stone_surface_max_y = surface_y;
 438
 439                 u32 i = vm->m_area.index(x, node_min.Y, z);
 440                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 441                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 442                                 if (y <= surface_y)
 443                                         vm->m_data[i] = n_stone;
 444                                 else if (y <= water_level)
 445                                         vm->m_data[i] = n_water;
 446                                 else
 447                                         vm->m_data[i] = n_air;
 448                         }
 449                         vm->m_area.add_y(em, i, 1);
 450                 }
 451         }
 452
 453         return stone_surface_max_y;
 454 }
 455
 456
 457 void MapgenV7::generateMountainTerrain() {
 458         if (node_max.Y <= water_level)
 459                 return;
 460
 461         MapNode n_stone(c_stone);
 462         u32 j = 0;
 463
 464         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 465         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 466                 u32 vi = vm->m_area.index(node_min.X, y, z);
 467                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 468                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 469
 470                         if (getMountainTerrainFromMap(j, index, y))
 471                                 vm->m_data[vi] = n_stone;
 472
 473                         vi++;
 474                         j++;
 475                 }
 476         }
 477 }
 478
 479
 480 void MapgenV7::generateRidgeTerrain() {
 481         MapNode n_water(c_water_source);
 482         MapNode n_air(CONTENT_AIR);
 483         u32 index = 0;
 484
 485         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 486         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 487                 u32 vi = vm->m_area.index(node_min.X, y, z);
 488                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 489                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 490
 491                         if (heightmap[j] < water_level - 4)
 492                                 continue;
 493
 494                         float widthn = (noise_terrain_persist->result[j] - 0.6) / 0.1;
 495                         //widthn = rangelim(widthn, -0.05, 0.5);
 496
 497                         float width = 0.3; // TODO: figure out acceptable perlin noise values
 498                         float uwatern = noise_ridge_uwater->result[j] * 2;
 499                         if (uwatern < -width || uwatern > width)
 500                                 continue;
 501
 502                         float height_mod = (float)(y + 17) / 2.5;
 503                         float width_mod  = (width - fabs(uwatern));
 504                         float nridge = noise_ridge->result[index] * (float)y / 7.0;
 505
 506                         if (y < water_level)
 507                                 nridge = -fabs(nridge) * 3.0 * widthn * 0.3;
 508
 509                         if (nridge + width_mod * height_mod < 0.6)
 510                                 continue;
 511
 512                         if (y < ridge_heightmap[j])
 513                                 ridge_heightmap[j] = y - 1;
 514
 515                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 516                 }
 517         }
 518 }
 519
 520
 521 void MapgenV7::generateBiomes() {
 522         if (node_max.Y < water_level)
 523                 return;
 524
 525         MapNode n_air(CONTENT_AIR);
 526         MapNode n_stone(c_stone);
 527         MapNode n_water(c_water_source);
 528
 529         v3s16 em = vm->m_area.getExtent();
 530         u32 index = 0;
 531
 532         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 533         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 534                 Biome *biome  = (Biome *)bmgr->get(biomemap[index]);
 535                 s16 dfiller   = biome->depth_filler + noise_filler_depth->result[index];
 536                 s16 y0_top    = biome->depth_top;
 537                 s16 y0_filler = biome->depth_filler + biome->depth_top + dfiller;
 538
 539                 s16 nplaced = 0;
 540                 u32 i = vm->m_area.index(x, node_max.Y, z);
 541
 542                 content_t c_above = vm->m_data[i + em.X].getContent();
 543                 bool have_air = c_above == CONTENT_AIR;
 544
 545                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 546                         content_t c = vm->m_data[i].getContent();
 547
 548                         // It could be the case that the elevation is equal to the chunk
 549                         // boundary, but the chunk above has not been generated yet
 550                         if (y == node_max.Y && c_above == CONTENT_IGNORE &&
 551                                 y == heightmap[index] && c == c_stone) {
 552                                 int j = (z - node_min.Z) * zstride +
 553                                                 (y - node_min.Y) * ystride +
 554                                                 (x - node_min.X);
 555                                 have_air = !getMountainTerrainFromMap(j, index, y);
 556                         }
 557
 558                         if (c == c_stone && have_air) {
 559                                 content_t c_below = vm->m_data[i - em.X].getContent();
 560
 561                                 if (c_below != CONTENT_AIR) {
 562                                         if (nplaced < y0_top) {
 563                                                 // A hack to prevent dirt_with_grass from being
 564                                                 // placed below water.  TODO: fix later
 565                                                 content_t c_place = ((y < water_level) &&
 566                                                                 (biome->c_top == c_dirt_with_grass)) ?
 567                                                                  c_dirt : biome->c_top;
 568
 569                                                 vm->m_data[i] = MapNode(c_place);
 570                                                 nplaced++;
 571                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 572                                                 vm->m_data[i] = MapNode(biome->c_filler);
 573                                                 nplaced++;
 574                                         } else {
 575                                                 have_air = false;
 576                                                 nplaced  = 0;
 577                                         }
 578                                 }
 579                         } else if (c == c_water_source) {
 580                                 have_air = true;
 581                                 nplaced = 0;
 582                                 vm->m_data[i] = MapNode(biome->c_water);
 583                         } else if (c == CONTENT_AIR) {
 584                                 have_air = true;
 585                                 nplaced = 0;
 586                         }
 587
 588                         vm->m_area.add_y(em, i, -1);
 589                 }
 590         }
 591 }
 592
 593
 594 void MapgenV7::dustTopNodes() {
 595         v3s16 em = vm->m_area.getExtent();
 596         u32 index = 0;
 597
 598         if (water_level > node_max.Y)
 599                 return;
 600
 601         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 602         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 603                 Biome *biome = (Biome *)bmgr->get(biomemap[index]);
 604
 605                 if (biome->c_dust == CONTENT_IGNORE)
 606                         continue;
 607
 608                 s16 y = node_max.Y;
 609                 u32 vi = vm->m_area.index(x, y, z);
 610                 for (; y >= node_min.Y; y--) {
 611                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 612                                 break;
 613
 614                         vm->m_area.add_y(em, vi, -1);
 615                 }
 616
 617                 content_t c = vm->m_data[vi].getContent();
 618                 if (c == biome->c_water && biome->c_dust_water != CONTENT_IGNORE) {
 619                         if (y < node_min.Y)
 620                                 continue;
 621
 622                         vm->m_data[vi] = MapNode(biome->c_dust_water);
 623                 } else if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE) {
 624                         if (y == node_max.Y)
 625                                 continue;
 626
 627                         vm->m_area.add_y(em, vi, 1);
 628                         vm->m_data[vi] = MapNode(biome->c_dust);
 629                 }
 630         }
 631 }
 632
 633
 634 #if 0
 635 void MapgenV7::addTopNodes() {
 636         v3s16 em = vm->m_area.getExtent();
 637         s16 ntopnodes;
 638         u32 index = 0;
 639
 640         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 641         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 642                 Biome *biome = bmgr->biomes[biomemap[index]];
 643
 644                 //////////////////// First, add top nodes below the ridge
 645                 s16 y = ridge_heightmap[index];
 646
 647                 // This cutoff is good enough, but not perfect.
 648                 // It will cut off potentially placed top nodes at chunk boundaries
 649                 if (y < node_min.Y)
 650                         continue;
 651                 if (y > node_max.Y) {
 652                         y = node_max.Y; // Let's see if we can still go downward anyway
 653                         u32 vi = vm->m_area.index(x, y, z);
 654                         content_t c = vm->m_data[vi].getContent();
 655                         if (ndef->get(c).walkable)
 656                                 continue;
 657                 }
 658
 659                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 660                 // might not be the actual height, just the lowest part in the chunk
 661                 // where a ridge had been carved
 662                 u32 i = vm->m_area.index(x, y, z);
 663                 for (; y >= node_min.Y; y--) {
 664                         content_t c = vm->m_data[i].getContent();
 665                         if (ndef->get(c).walkable)
 666                                 break;
 667                         vm->m_area.add_y(em, i, -1);
 668                 }
 669
 670                 if (y != node_min.Y - 1 && y >= water_level) {
 671                         ridge_heightmap[index] = y; //update ridgeheight
 672                         ntopnodes = biome->top_depth;
 673                         for (; y <= node_max.Y && ntopnodes; y++) {
 674                                 ntopnodes--;
 675                                 vm->m_data[i] = MapNode(biome->c_top);
 676                                 vm->m_area.add_y(em, i, 1);
 677                         }
 678                         // If dirt, grow grass on it.
 679                         if (y > water_level - 10 &&
 680                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 681                                 vm->m_area.add_y(em, i, -1);
 682                                 if (vm->m_data[i].getContent() == c_dirt)
 683                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 684                         }
 685                 }
 686
 687                 //////////////////// Now, add top nodes on top of the ridge
 688                 y = heightmap[index];
 689                 if (y > node_max.Y) {
 690                         y = node_max.Y; // Let's see if we can still go downward anyway
 691                         u32 vi = vm->m_area.index(x, y, z);
 692                         content_t c = vm->m_data[vi].getContent();
 693                         if (ndef->get(c).walkable)
 694                                 continue;
 695                 }
 696
 697                 i = vm->m_area.index(x, y, z);
 698                 for (; y >= node_min.Y; y--) {
 699                         content_t c = vm->m_data[i].getContent();
 700                         if (ndef->get(c).walkable)
 701                                 break;
 702                         vm->m_area.add_y(em, i, -1);
 703                 }
 704
 705                 if (y != node_min.Y - 1) {
 706                         ntopnodes = biome->top_depth;
 707                         // Let's see if we've already added it...
 708                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 709                                 continue;
 710
 711                         for (; y <= node_max.Y && ntopnodes; y++) {
 712                                 ntopnodes--;
 713                                 vm->m_data[i] = MapNode(biome->c_top);
 714                                 vm->m_area.add_y(em, i, 1);
 715                         }
 716                         // If dirt, grow grass on it.
 717                         if (y > water_level - 10 &&
 718                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 719                                 vm->m_area.add_y(em, i, -1);
 720                                 if (vm->m_data[i].getContent() == c_dirt)
 721                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 722                         }
 723                 }
 724         }
 725 }
 726 #endif
 727
 728
 729 NoiseParams nparams_v7_def_cave(6, 6.0, v3f(250.0, 250.0, 250.0), 34329, 3, 0.50);
 730
 731 void MapgenV7::generateCaves(int max_stone_y) {
 732         PseudoRandom ps(blockseed + 21343);
 733
 734         int volume_nodes = (node_max.X - node_min.X + 1) *
 735                                            (node_max.Y - node_min.Y + 1) *
 736                                            (node_max.Z - node_min.Z + 1);
 737         float cave_amount = NoisePerlin2D(&nparams_v7_def_cave,
 738                                                                 node_min.X, node_min.Y, seed);
 739
 740         u32 caves_count = MYMAX(0.0, cave_amount) * volume_nodes / 250000;
 741         for (u32 i = 0; i < caves_count; i++) {
 742                 CaveV7 cave(this, &ps, false);
 743                 cave.makeCave(node_min, node_max, max_stone_y);
 744         }
 745
 746         u32 bruises_count = (ps.range(1, 8) == 1) ? ps.range(0, ps.range(0, 2)) : 1;
 747         for (u32 i = 0; i < bruises_count; i++) {
 748                 CaveV7 cave(this, &ps, true);
 749                 cave.makeCave(node_min, node_max, max_stone_y);
 750         }
 751 }