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 "biome.h"
  38 #include "mapgen_v7.h"
  39
  40
  41 FlagDesc flagdesc_mapgen_v7[] = {
  42         {"mountains", MGV7_MOUNTAINS},
  43         {"ridges",    MGV7_RIDGES},
  44         {NULL,        0}
  45 };
  46
  47 ///////////////////////////////////////////////////////////////////////////////
  48
  49
  50 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge) {
  51         this->generating  = false;
  52         this->id     = mapgenid;
  53         this->emerge = emerge;
  54         this->bmgr   = emerge->biomedef;
  55
  56         this->seed        = (int)params->seed;
  57         this->water_level = params->water_level;
  58         this->flags       = params->flags;
  59         this->gennotify   = emerge->gennotify;
  60
  61         this->csize   = v3s16(1, 1, 1) * params->chunksize * MAP_BLOCKSIZE;
  62
  63         //// amount of elements to skip for the next index
  64         //// for noise/height/biome maps (not vmanip)
  65         this->ystride = csize.X;
  66         this->zstride = csize.X * csize.Y;
  67
  68         this->biomemap  = new u8[csize.X * csize.Z];
  69         this->heightmap = new s16[csize.X * csize.Z];
  70         this->ridge_heightmap = new s16[csize.X * csize.Z];
  71
  72         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  73
  74         //// Terrain noise
  75         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  76         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  77         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  78         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  79         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  80         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  81         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  82
  83         //// 3d terrain noise
  84         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y, csize.Z);
  85         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y, csize.Z);
  86
  87         //// Biome noise
  88         noise_heat     = new Noise(bmgr->np_heat,     seed, csize.X, csize.Z);
  89         noise_humidity = new Noise(bmgr->np_humidity, seed, csize.X, csize.Z);
  90
  91         //// Resolve nodes to be used
  92         INodeDefManager *ndef = emerge->ndef;
  93
  94         c_stone           = ndef->getId("mapgen_stone");
  95         c_dirt            = ndef->getId("mapgen_dirt");
  96         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  97         c_sand            = ndef->getId("mapgen_sand");
  98         c_water_source    = ndef->getId("mapgen_water_source");
  99         c_lava_source     = ndef->getId("mapgen_lava_source");
 100         c_ice             = ndef->getId("default:ice");
 101         if (c_ice == CONTENT_IGNORE)
 102                 c_ice = CONTENT_AIR;
 103 }
 104
 105
 106 MapgenV7::~MapgenV7() {
 107         delete noise_terrain_base;
 108         delete noise_terrain_persist;
 109         delete noise_height_select;
 110         delete noise_terrain_alt;
 111         delete noise_filler_depth;
 112         delete noise_mount_height;
 113         delete noise_ridge_uwater;
 114         delete noise_mountain;
 115         delete noise_ridge;
 116
 117         delete noise_heat;
 118         delete noise_humidity;
 119
 120         delete[] ridge_heightmap;
 121         delete[] heightmap;
 122         delete[] biomemap;
 123 }
 124
 125
 126 MapgenV7Params::MapgenV7Params() {
 127         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 128
 129         np_terrain_base    = NoiseParams(4,    70,  v3f(300, 300, 300), 82341, 6, 0.7);
 130         np_terrain_alt     = NoiseParams(4,    25,  v3f(600, 600, 600), 5934,  5, 0.6);
 131         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500, 500, 500), 539,   3, 0.6);
 132         np_height_select   = NoiseParams(-0.5, 1,   v3f(250, 250, 250), 4213,  5, 0.69);
 133         np_filler_depth    = NoiseParams(0,    1.2, v3f(150, 150, 150), 261,   4, 0.7);
 134         np_mount_height    = NoiseParams(100,  30,  v3f(500, 500, 500), 72449, 4, 0.6);
 135         np_ridge_uwater    = NoiseParams(0,    1,   v3f(500, 500, 500), 85039, 4, 0.6);
 136         np_mountain        = NoiseParams(0,    1,   v3f(250, 350, 250), 5333,  5, 0.68);
 137         np_ridge           = NoiseParams(0,    1,   v3f(100, 100, 100), 6467,  4, 0.75);
 138 }
 139
 140
 141 void MapgenV7Params::readParams(Settings *settings) {
 142         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 143
 144         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 145         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 146         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 147         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 148         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 149         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 150         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 151         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 152         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 153 }
 154
 155
 156 void MapgenV7Params::writeParams(Settings *settings) {
 157         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 158
 159         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 160         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 161         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 162         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 163         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 164         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 165         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 166         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 167         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 168 }
 169
 170
 171 ///////////////////////////////////////
 172
 173
 174 int MapgenV7::getGroundLevelAtPoint(v2s16 p) {
 175         // Base terrain calculation
 176         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 177
 178         // Ridge/river terrain calculation
 179         float width = 0.3;
 180         float uwatern = NoisePerlin2DNoTxfm(noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 181         // actually computing the depth of the ridge is much more expensive;
 182         // if inside a river, simply guess
 183         if (uwatern >= -width && uwatern <= width)
 184                 return water_level - 10;
 185
 186         // Mountain terrain calculation
 187         int iters = 128; // don't even bother iterating more than 128 times..
 188         while (iters--) {
 189                 //current point would have been air
 190                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 191                         return y;
 192
 193                 y++;
 194         }
 195
 196         return y;
 197 }
 198
 199
 200 void MapgenV7::makeChunk(BlockMakeData *data) {
 201         assert(data->vmanip);
 202         assert(data->nodedef);
 203         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 204                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 205                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 206         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 207                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 208                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 209
 210         this->generating = true;
 211         this->vm   = data->vmanip;
 212         this->ndef = data->nodedef;
 213         //TimeTaker t("makeChunk");
 214
 215         v3s16 blockpos_min = data->blockpos_min;
 216         v3s16 blockpos_max = data->blockpos_max;
 217         node_min = blockpos_min * MAP_BLOCKSIZE;
 218         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 219         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 220         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 221
 222         blockseed = emerge->getBlockSeed(full_node_min);  //////use getBlockSeed2()!
 223
 224         // Make some noise
 225         calculateNoise();
 226
 227         // Generate base terrain, mountains, and ridges with initial heightmaps
 228         s16 stone_surface_max_y = generateTerrain();
 229
 230         updateHeightmap(node_min, node_max);
 231
 232         // Calculate biomes
 233         BiomeNoiseInput binput;
 234         binput.mapsize      = v2s16(csize.X, csize.Z);
 235         binput.heat_map     = noise_heat->result;
 236         binput.humidity_map = noise_humidity->result;
 237         binput.height_map   = heightmap;
 238         bmgr->calcBiomes(&binput, biomemap);
 239
 240         // Actually place the biome-specific nodes and what not
 241         generateBiomes();
 242
 243         if (flags & MG_CAVES)
 244                 generateCaves(stone_surface_max_y);
 245
 246         if (flags & MG_DUNGEONS) {
 247                 DungeonGen dgen(this, NULL);
 248                 dgen.generate(blockseed, full_node_min, full_node_max);
 249         }
 250
 251         for (size_t i = 0; i != emerge->decorations.size(); i++) {
 252                 Decoration *deco = emerge->decorations[i];
 253                 deco->placeDeco(this, blockseed + i, node_min, node_max);
 254         }
 255
 256         for (size_t i = 0; i != emerge->ores.size(); i++) {
 257                 Ore *ore = emerge->ores[i];
 258                 ore->placeOre(this, blockseed + i, node_min, node_max);
 259         }
 260
 261         // Sprinkle some dust on top after everything else was generated
 262         dustTopNodes();
 263
 264         //printf("makeChunk: %dms\n", t.stop());
 265
 266         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 267
 268         if (flags & MG_LIGHT)
 269                 calcLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 270                                          node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE);
 271         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 272         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 273
 274         this->generating = false;
 275 }
 276
 277
 278 void MapgenV7::calculateNoise() {
 279         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 280         int x = node_min.X;
 281         int y = node_min.Y;
 282         int z = node_min.Z;
 283
 284         noise_height_select->perlinMap2D(x, z);
 285         noise_height_select->transformNoiseMap();
 286
 287         noise_terrain_persist->perlinMap2D(x, z);
 288         noise_terrain_persist->transformNoiseMap();
 289         float *persistmap = noise_terrain_persist->result;
 290         for (int i = 0; i != csize.X * csize.Z; i++)
 291                 persistmap[i] = rangelim(persistmap[i], 0.4, 0.9);
 292
 293         noise_terrain_base->perlinMap2DModulated(x, z, persistmap);
 294         noise_terrain_base->transformNoiseMap();
 295
 296         noise_terrain_alt->perlinMap2DModulated(x, z, persistmap);
 297         noise_terrain_alt->transformNoiseMap();
 298
 299         noise_filler_depth->perlinMap2D(x, z);
 300
 301         if (spflags & MGV7_MOUNTAINS) {
 302                 noise_mountain->perlinMap3D(x, y, z);
 303                 noise_mount_height->perlinMap2D(x, z);
 304                 noise_mount_height->transformNoiseMap();
 305         }
 306
 307         if (spflags & MGV7_RIDGES) {
 308                 noise_ridge->perlinMap3D(x, y, z);
 309                 noise_ridge_uwater->perlinMap2D(x, z);
 310         }
 311
 312         noise_heat->perlinMap2D(x, z);
 313         noise_humidity->perlinMap2D(x, z);
 314
 315         //printf("calculateNoise: %dus\n", t.stop());
 316 }
 317
 318
 319 Biome *MapgenV7::getBiomeAtPoint(v3s16 p) {
 320         float heat      = NoisePerlin2D(bmgr->np_heat, p.X, p.Z, seed);
 321         float humidity  = NoisePerlin2D(bmgr->np_humidity, p.X, p.Z, seed);
 322         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 323
 324         return bmgr->getBiome(heat, humidity, groundlevel);
 325 }
 326
 327 //needs to be updated
 328 float MapgenV7::baseTerrainLevelAtPoint(int x, int z) {
 329         float hselect = NoisePerlin2D(noise_height_select->np, x, z, seed);
 330         hselect = rangelim(hselect, 0.0, 1.0);
 331
 332         float persist = NoisePerlin2D(noise_terrain_persist->np, x, z, seed);
 333         persist = rangelim(persist, 0.4, 0.9);
 334
 335         noise_terrain_base->np->persist = persist;
 336         float height_base = NoisePerlin2D(noise_terrain_base->np, x, z, seed);
 337
 338         noise_terrain_alt->np->persist = persist;
 339         float height_alt = NoisePerlin2D(noise_terrain_alt->np, x, z, seed);
 340
 341         if (height_alt > height_base)
 342                 return height_alt;
 343
 344         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 345 }
 346
 347
 348 float MapgenV7::baseTerrainLevelFromMap(int index) {
 349         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 350         float height_base = noise_terrain_base->result[index];
 351         float height_alt  = noise_terrain_alt->result[index];
 352
 353         if (height_alt > height_base)
 354                 return height_alt;
 355
 356         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 357 }
 358
 359
 360 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z) {
 361         float mnt_h_n = NoisePerlin2D(noise_mount_height->np, x, z, seed);
 362         float height_modifier = -((float)y / rangelim(mnt_h_n, 80.0, 150.0));
 363         float mnt_n = NoisePerlin3D(noise_mountain->np, x, y, z, seed);
 364
 365         return mnt_n + height_modifier >= 0.6;
 366 }
 367
 368
 369 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y) {
 370         float mounthn = noise_mount_height->result[idx_xz];
 371         float height_modifier = -((float)y / rangelim(mounthn, 80.0, 150.0));
 372         return (noise_mountain->result[idx_xyz] + height_modifier >= 0.6);
 373 }
 374
 375
 376 #if 0
 377 void MapgenV7::carveRivers() {
 378         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 379         MapNode n_stone(c_stone);
 380         u32 index = 0;
 381
 382         int river_depth = 4;
 383
 384         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 385         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 386                 float terrain_mod  = noise_terrain_mod->result[index];
 387                 NoiseParams *np = noise_terrain_river->np;
 388                 np->persist = noise_terrain_persist->result[index];
 389                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 390                 float height = terrain_river * (1 - abs(terrain_mod)) *
 391                                                 noise_terrain_river->np->scale;
 392                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 393
 394                 s16 y = heightmap[index];
 395                 if (height < 1.0 && y > river_depth &&
 396                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 397
 398                         for (s16 ry = y; ry != y - river_depth; ry--) {
 399                                 u32 vi = vm->m_area.index(x, ry, z);
 400                                 vm->m_data[vi] = n_air;
 401                         }
 402
 403                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 404                         vm->m_data[vi] = n_water_source;
 405                 }
 406         }
 407 }
 408 #endif
 409
 410
 411 int MapgenV7::generateTerrain() {
 412         int ymax = generateBaseTerrain();
 413
 414         if (spflags & MGV7_MOUNTAINS)
 415                 generateMountainTerrain();
 416
 417         if (spflags & MGV7_RIDGES)
 418                 generateRidgeTerrain();
 419
 420         return ymax;
 421 }
 422
 423
 424 int MapgenV7::generateBaseTerrain() {
 425         MapNode n_air(CONTENT_AIR);
 426         MapNode n_stone(c_stone);
 427         MapNode n_water(c_water_source);
 428
 429         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 430         v3s16 em = vm->m_area.getExtent();
 431         u32 index = 0;
 432
 433         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 434         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 435                 float surface_height = baseTerrainLevelFromMap(index);
 436                 s16 surface_y = (s16)surface_height;
 437
 438                 heightmap[index]       = surface_y;
 439                 ridge_heightmap[index] = surface_y;
 440
 441                 if (surface_y > stone_surface_max_y)
 442                         stone_surface_max_y = surface_y;
 443
 444                 u32 i = vm->m_area.index(x, node_min.Y, z);
 445                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 446                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 447                                 if (y <= surface_y)
 448                                         vm->m_data[i] = n_stone;
 449                                 else if (y <= water_level)
 450                                         vm->m_data[i] = n_water;
 451                                 else
 452                                         vm->m_data[i] = n_air;
 453                         }
 454                         vm->m_area.add_y(em, i, 1);
 455                 }
 456         }
 457
 458         return stone_surface_max_y;
 459 }
 460
 461
 462 void MapgenV7::generateMountainTerrain() {
 463         if (node_max.Y <= water_level)
 464                 return;
 465
 466         MapNode n_stone(c_stone);
 467         u32 j = 0;
 468
 469         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 470         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 471                 u32 vi = vm->m_area.index(node_min.X, y, z);
 472                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 473                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 474
 475                         if (getMountainTerrainFromMap(j, index, y))
 476                                 vm->m_data[vi] = n_stone;
 477
 478                         vi++;
 479                         j++;
 480                 }
 481         }
 482 }
 483
 484
 485 void MapgenV7::generateRidgeTerrain() {
 486         MapNode n_water(c_water_source);
 487         MapNode n_air(CONTENT_AIR);
 488         u32 index = 0;
 489
 490         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 491         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 492                 u32 vi = vm->m_area.index(node_min.X, y, z);
 493                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 494                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 495
 496                         if (heightmap[j] < water_level - 4)
 497                                 continue;
 498
 499                         float widthn = (noise_terrain_persist->result[j] - 0.6) / 0.1;
 500                         //widthn = rangelim(widthn, -0.05, 0.5);
 501
 502                         float width = 0.3; // TODO: figure out acceptable perlin noise values
 503                         float uwatern = noise_ridge_uwater->result[j] * 2;
 504                         if (uwatern < -width || uwatern > width)
 505                                 continue;
 506
 507                         float height_mod = (float)(y + 17) / 2.5;
 508                         float width_mod  = (width - fabs(uwatern));
 509                         float nridge = noise_ridge->result[index] * (float)y / 7.0;
 510
 511                         if (y < water_level)
 512                                 nridge = -fabs(nridge) * 3.0 * widthn * 0.3;
 513
 514                         if (nridge + width_mod * height_mod < 0.6)
 515                                 continue;
 516
 517                         if (y < ridge_heightmap[j])
 518                                 ridge_heightmap[j] = y - 1;
 519
 520                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 521                 }
 522         }
 523 }
 524
 525
 526 void MapgenV7::generateBiomes() {
 527         if (node_max.Y < water_level)
 528                 return;
 529
 530         MapNode n_air(CONTENT_AIR);
 531         MapNode n_stone(c_stone);
 532         MapNode n_water(c_water_source);
 533
 534         v3s16 em = vm->m_area.getExtent();
 535         u32 index = 0;
 536
 537         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 538         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 539                 Biome *biome  = bmgr->biomes[biomemap[index]];
 540                 s16 dfiller   = biome->depth_filler + noise_filler_depth->result[index];
 541                 s16 y0_top    = biome->depth_top;
 542                 s16 y0_filler = biome->depth_filler + biome->depth_top + dfiller;
 543
 544                 s16 nplaced = 0;
 545                 u32 i = vm->m_area.index(x, node_max.Y, z);
 546
 547                 content_t c_above = vm->m_data[i + em.X].getContent();
 548                 bool have_air = c_above == CONTENT_AIR;
 549
 550                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 551                         content_t c = vm->m_data[i].getContent();
 552
 553                         // It could be the case that the elevation is equal to the chunk
 554                         // boundary, but the chunk above has not been generated yet
 555                         if (y == node_max.Y && c_above == CONTENT_IGNORE &&
 556                                 y == heightmap[index] && c == c_stone) {
 557                                 int j = (z - node_min.Z) * zstride +
 558                                                 (y - node_min.Y) * ystride +
 559                                                 (x - node_min.X);
 560                                 have_air = !getMountainTerrainFromMap(j, index, y);
 561                         }
 562
 563                         if (c == c_stone && have_air) {
 564                                 content_t c_below = vm->m_data[i - em.X].getContent();
 565
 566                                 if (c_below != CONTENT_AIR) {
 567                                         if (nplaced < y0_top) {
 568                                                 // A hack to prevent dirt_with_grass from being
 569                                                 // placed below water.  TODO: fix later
 570                                                 content_t c_place = ((y < water_level) &&
 571                                                                 (biome->c_top == c_dirt_with_grass)) ?
 572                                                                  c_dirt : biome->c_top;
 573
 574                                                 vm->m_data[i] = MapNode(c_place);
 575                                                 nplaced++;
 576                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 577                                                 vm->m_data[i] = MapNode(biome->c_filler);
 578                                                 nplaced++;
 579                                         } else {
 580                                                 have_air = false;
 581                                                 nplaced  = 0;
 582                                         }
 583                                 }
 584                         } else if (c == c_water_source) {
 585                                 have_air = true;
 586                                 nplaced = 0;
 587                                 vm->m_data[i] = MapNode(biome->c_water);
 588                         } else if (c == CONTENT_AIR) {
 589                                 have_air = true;
 590                                 nplaced = 0;
 591                         }
 592
 593                         vm->m_area.add_y(em, i, -1);
 594                 }
 595         }
 596 }
 597
 598
 599 void MapgenV7::dustTopNodes() {
 600         v3s16 em = vm->m_area.getExtent();
 601         u32 index = 0;
 602
 603         if (water_level > node_max.Y)
 604                 return;
 605
 606         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 607         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 608                 Biome *biome = bmgr->biomes[biomemap[index]];
 609
 610                 if (biome->c_dust == CONTENT_IGNORE)
 611                         continue;
 612
 613                 s16 y = node_max.Y;
 614                 u32 vi = vm->m_area.index(x, y, z);
 615                 for (; y >= node_min.Y; y--) {
 616                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 617                                 break;
 618
 619                         vm->m_area.add_y(em, vi, -1);
 620                 }
 621
 622                 content_t c = vm->m_data[vi].getContent();
 623                 if (c == biome->c_water && biome->c_dust_water != CONTENT_IGNORE) {
 624                         if (y < node_min.Y)
 625                                 continue;
 626
 627                         vm->m_data[vi] = MapNode(biome->c_dust_water);
 628                 } else if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE) {
 629                         if (y == node_max.Y)
 630                                 continue;
 631
 632                         vm->m_area.add_y(em, vi, 1);
 633                         vm->m_data[vi] = MapNode(biome->c_dust);
 634                 }
 635         }
 636 }
 637
 638
 639 #if 0
 640 void MapgenV7::addTopNodes() {
 641         v3s16 em = vm->m_area.getExtent();
 642         s16 ntopnodes;
 643         u32 index = 0;
 644
 645         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 646         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 647                 Biome *biome = bmgr->biomes[biomemap[index]];
 648
 649                 //////////////////// First, add top nodes below the ridge
 650                 s16 y = ridge_heightmap[index];
 651
 652                 // This cutoff is good enough, but not perfect.
 653                 // It will cut off potentially placed top nodes at chunk boundaries
 654                 if (y < node_min.Y)
 655                         continue;
 656                 if (y > node_max.Y) {
 657                         y = node_max.Y; // Let's see if we can still go downward anyway
 658                         u32 vi = vm->m_area.index(x, y, z);
 659                         content_t c = vm->m_data[vi].getContent();
 660                         if (ndef->get(c).walkable)
 661                                 continue;
 662                 }
 663
 664                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 665                 // might not be the actual height, just the lowest part in the chunk
 666                 // where a ridge had been carved
 667                 u32 i = vm->m_area.index(x, y, z);
 668                 for (; y >= node_min.Y; y--) {
 669                         content_t c = vm->m_data[i].getContent();
 670                         if (ndef->get(c).walkable)
 671                                 break;
 672                         vm->m_area.add_y(em, i, -1);
 673                 }
 674
 675                 if (y != node_min.Y - 1 && y >= water_level) {
 676                         ridge_heightmap[index] = y; //update ridgeheight
 677                         ntopnodes = biome->top_depth;
 678                         for (; y <= node_max.Y && ntopnodes; y++) {
 679                                 ntopnodes--;
 680                                 vm->m_data[i] = MapNode(biome->c_top);
 681                                 vm->m_area.add_y(em, i, 1);
 682                         }
 683                         // If dirt, grow grass on it.
 684                         if (y > water_level - 10 &&
 685                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 686                                 vm->m_area.add_y(em, i, -1);
 687                                 if (vm->m_data[i].getContent() == c_dirt)
 688                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 689                         }
 690                 }
 691
 692                 //////////////////// Now, add top nodes on top of the ridge
 693                 y = heightmap[index];
 694                 if (y > node_max.Y) {
 695                         y = node_max.Y; // Let's see if we can still go downward anyway
 696                         u32 vi = vm->m_area.index(x, y, z);
 697                         content_t c = vm->m_data[vi].getContent();
 698                         if (ndef->get(c).walkable)
 699                                 continue;
 700                 }
 701
 702                 i = vm->m_area.index(x, y, z);
 703                 for (; y >= node_min.Y; y--) {
 704                         content_t c = vm->m_data[i].getContent();
 705                         if (ndef->get(c).walkable)
 706                                 break;
 707                         vm->m_area.add_y(em, i, -1);
 708                 }
 709
 710                 if (y != node_min.Y - 1) {
 711                         ntopnodes = biome->top_depth;
 712                         // Let's see if we've already added it...
 713                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 714                                 continue;
 715
 716                         for (; y <= node_max.Y && ntopnodes; y++) {
 717                                 ntopnodes--;
 718                                 vm->m_data[i] = MapNode(biome->c_top);
 719                                 vm->m_area.add_y(em, i, 1);
 720                         }
 721                         // If dirt, grow grass on it.
 722                         if (y > water_level - 10 &&
 723                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 724                                 vm->m_area.add_y(em, i, -1);
 725                                 if (vm->m_data[i].getContent() == c_dirt)
 726                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 727                         }
 728                 }
 729         }
 730 }
 731 #endif
 732
 733
 734 NoiseParams nparams_v7_def_cave(6, 6.0, v3f(250.0, 250.0, 250.0), 34329, 3, 0.50);
 735
 736 void MapgenV7::generateCaves(int max_stone_y) {
 737         PseudoRandom ps(blockseed + 21343);
 738
 739         int volume_nodes = (node_max.X - node_min.X + 1) *
 740                                            (node_max.Y - node_min.Y + 1) *
 741                                            (node_max.Z - node_min.Z + 1);
 742         float cave_amount = NoisePerlin2D(&nparams_v7_def_cave,
 743                                                                 node_min.X, node_min.Y, seed);
 744
 745         u32 caves_count = MYMAX(0.0, cave_amount) * volume_nodes / 250000;
 746         for (u32 i = 0; i < caves_count; i++) {
 747                 CaveV7 cave(this, &ps, false);
 748                 cave.makeCave(node_min, node_max, max_stone_y);
 749         }
 750
 751         u32 bruises_count = (ps.range(1, 8) == 1) ? ps.range(0, ps.range(0, 2)) : 1;
 752         for (u32 i = 0; i < bruises_count; i++) {
 753                 CaveV7 cave(this, &ps, true);
 754                 cave.makeCave(node_min, node_max, max_stone_y);
 755         }
 756 }