src/mapgen_v6.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   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 #include "mapgen.h"
  21 #include "voxel.h"
  22 #include "noise.h"
  23 #include "mapblock.h"
  24 #include "mapnode.h"
  25 #include "map.h"
  26 //#include "serverobject.h"
  27 #include "content_sao.h"
  28 #include "nodedef.h"
  29 #include "content_mapnode.h" // For content_mapnode_get_new_name
  30 #include "voxelalgorithms.h"
  31 #include "profiler.h"
  32 #include "settings.h" // For g_settings
  33 #include "main.h" // For g_profiler
  34 #include "emerge.h"
  35 #include "dungeongen.h"
  36 #include "cavegen.h"
  37 #include "treegen.h"
  38 #include "mapgen_v6.h"
  39
  40 /////////////////// Mapgen V6 perlin noise default values
  41 NoiseParams nparams_v6_def_terrain_base =
  42         {-AVERAGE_MUD_AMOUNT, 20.0, v3f(250.0, 250.0, 250.0), 82341, 5, 0.6};
  43 NoiseParams nparams_v6_def_terrain_higher =
  44         {20.0, 16.0, v3f(500.0, 500.0, 500.0), 85039, 5, 0.6};
  45 NoiseParams nparams_v6_def_steepness =
  46         {0.85, 0.5, v3f(125.0, 125.0, 125.0), -932, 5, 0.7};
  47 NoiseParams nparams_v6_def_height_select =
  48         {0.5, 1.0, v3f(250.0, 250.0, 250.0), 4213, 5, 0.69};
  49 NoiseParams nparams_v6_def_mud =
  50         {AVERAGE_MUD_AMOUNT, 2.0, v3f(200.0, 200.0, 200.0), 91013, 3, 0.55};
  51 NoiseParams nparams_v6_def_beach =
  52         {0.0, 1.0, v3f(250.0, 250.0, 250.0), 59420, 3, 0.50};
  53 NoiseParams nparams_v6_def_biome =
  54         {0.0, 1.0, v3f(250.0, 250.0, 250.0), 9130, 3, 0.50};
  55 NoiseParams nparams_v6_def_cave =
  56         {6.0, 6.0, v3f(250.0, 250.0, 250.0), 34329, 3, 0.50};
  57 NoiseParams nparams_v6_def_humidity =
  58         {0.5, 0.5, v3f(500.0, 500.0, 500.0), 72384, 4, 0.66};
  59 NoiseParams nparams_v6_def_trees =
  60         {0.0, 1.0, v3f(125.0, 125.0, 125.0), 2, 4, 0.66};
  61 NoiseParams nparams_v6_def_apple_trees =
  62         {0.0, 1.0, v3f(100.0, 100.0, 100.0), 342902, 3, 0.45};
  63
  64
  65 ///////////////////////////////////////////////////////////////////////////////
  66
  67
  68 MapgenV6::MapgenV6(int mapgenid, MapgenV6Params *params, EmergeManager *emerge) {
  69         this->generating  = false;
  70         this->id       = mapgenid;
  71         this->emerge   = emerge;
  72
  73         this->seed     = (int)params->seed;
  74         this->water_level = params->water_level;
  75         this->flags   = params->flags;
  76         this->csize   = v3s16(1, 1, 1) * params->chunksize * MAP_BLOCKSIZE;
  77
  78         this->freq_desert = params->freq_desert;
  79         this->freq_beach  = params->freq_beach;
  80
  81         this->ystride = csize.X; //////fix this
  82
  83         np_cave        = params->np_cave;
  84         np_humidity    = params->np_humidity;
  85         np_trees       = params->np_trees;
  86         np_apple_trees = params->np_apple_trees;
  87
  88         noise_terrain_base   = new Noise(params->np_terrain_base,   seed, csize.X, csize.Y);
  89         noise_terrain_higher = new Noise(params->np_terrain_higher, seed, csize.X, csize.Y);
  90         noise_steepness      = new Noise(params->np_steepness,      seed, csize.X, csize.Y);
  91         noise_height_select  = new Noise(params->np_height_select,  seed, csize.X, csize.Y);
  92         noise_mud            = new Noise(params->np_mud,            seed, csize.X, csize.Y);
  93         noise_beach          = new Noise(params->np_beach,          seed, csize.X, csize.Y);
  94         noise_biome          = new Noise(params->np_biome,          seed, csize.X, csize.Y);
  95 }
  96
  97
  98 MapgenV6::~MapgenV6() {
  99         delete noise_terrain_base;
 100         delete noise_terrain_higher;
 101         delete noise_steepness;
 102         delete noise_height_select;
 103         delete noise_mud;
 104         delete noise_beach;
 105         delete noise_biome;
 106 }
 107
 108
 109 //////////////////////// Some helper functions for the map generator
 110
 111 // Returns Y one under area minimum if not found
 112 s16 MapgenV6::find_ground_level(v2s16 p2d) {
 113         v3s16 em = vm->m_area.getExtent();
 114         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 115         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 116         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 117         s16 y;
 118
 119         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 120                 MapNode &n = vm->m_data[i];
 121                 if(ndef->get(n).walkable)
 122                         break;
 123
 124                 vm->m_area.add_y(em, i, -1);
 125         }
 126         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 127 }
 128
 129 // Returns Y one under area minimum if not found
 130 s16 MapgenV6::find_stone_level(v2s16 p2d) {
 131         v3s16 em = vm->m_area.getExtent();
 132         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 133         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 134         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 135         s16 y;
 136
 137         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 138                 MapNode &n = vm->m_data[i];
 139                 content_t c = n.getContent();
 140                 if (c != CONTENT_IGNORE && (
 141                         c == c_stone || c == c_desert_stone))
 142                         break;
 143
 144                 vm->m_area.add_y(em, i, -1);
 145         }
 146         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 147 }
 148
 149
 150 // Required by mapgen.h
 151 bool MapgenV6::block_is_underground(u64 seed, v3s16 blockpos)
 152 {
 153         /*s16 minimum_groundlevel = (s16)get_sector_minimum_ground_level(
 154                         seed, v2s16(blockpos.X, blockpos.Z));*/
 155         // Nah, this is just a heuristic, just return something
 156         s16 minimum_groundlevel = water_level;
 157
 158         if(blockpos.Y*MAP_BLOCKSIZE + MAP_BLOCKSIZE <= minimum_groundlevel)
 159                 return true;
 160         else
 161                 return false;
 162 }
 163
 164
 165 //////////////////////// Base terrain height functions
 166
 167 float MapgenV6::baseTerrainLevel(float terrain_base, float terrain_higher,
 168                                                                         float steepness, float height_select) {
 169         float base   = water_level + terrain_base;
 170         float higher = water_level + terrain_higher;
 171
 172         // Limit higher ground level to at least base
 173         if(higher < base)
 174                 higher = base;
 175
 176         // Steepness factor of cliffs
 177         float b = steepness;
 178         b = rangelim(b, 0.0, 1000.0);
 179         b = 5 * b * b * b * b * b * b * b;
 180         b = rangelim(b, 0.5, 1000.0);
 181
 182         // Values 1.5...100 give quite horrible looking slopes
 183         if (b > 1.5 && b < 100.0)
 184                 b = (b < 10.0) ? 1.5 : 100.0;
 185
 186         float a_off = -0.20; // Offset to more low
 187         float a = 0.5 + b * (a_off + height_select);
 188         a = rangelim(a, 0.0, 1.0); // Limit
 189
 190         return base * (1.0 - a) + higher * a;
 191 }
 192
 193
 194 float MapgenV6::baseTerrainLevelFromNoise(v2s16 p) {
 195         if (flags & MG_FLAT)
 196                 return water_level;
 197
 198         float terrain_base   = NoisePerlin2DPosOffset(noise_terrain_base->np,
 199                                                         p.X, 0.5, p.Y, 0.5, seed);
 200         float terrain_higher = NoisePerlin2DPosOffset(noise_terrain_higher->np,
 201                                                         p.X, 0.5, p.Y, 0.5, seed);
 202         float steepness      = NoisePerlin2DPosOffset(noise_steepness->np,
 203                                                         p.X, 0.5, p.Y, 0.5, seed);
 204         float height_select  = NoisePerlin2DNoTxfmPosOffset(noise_height_select->np,
 205                                                         p.X, 0.5, p.Y, 0.5, seed);
 206
 207         return baseTerrainLevel(terrain_base, terrain_higher,
 208                                                         steepness,    height_select);
 209 }
 210
 211
 212 float MapgenV6::baseTerrainLevelFromMap(v2s16 p) {
 213         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 214         return baseTerrainLevelFromMap(index);
 215 }
 216
 217
 218 float MapgenV6::baseTerrainLevelFromMap(int index) {
 219         if (flags & MG_FLAT)
 220                 return water_level;
 221
 222         float terrain_base   = noise_terrain_base->result[index];
 223         float terrain_higher = noise_terrain_higher->result[index];
 224         float steepness      = noise_steepness->result[index];
 225         float height_select  = noise_height_select->result[index];
 226
 227         return baseTerrainLevel(terrain_base, terrain_higher,
 228                                                         steepness,    height_select);
 229 }
 230
 231
 232 s16 MapgenV6::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision) {
 233         return baseTerrainLevelFromNoise(p2d) + AVERAGE_MUD_AMOUNT;
 234 }
 235
 236
 237 int MapgenV6::getGroundLevelAtPoint(v2s16 p) {
 238         return baseTerrainLevelFromNoise(p) + AVERAGE_MUD_AMOUNT;
 239 }
 240
 241
 242 //////////////////////// Noise functions
 243
 244 float MapgenV6::getMudAmount(v2s16 p) {
 245         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 246         return getMudAmount(index);
 247 }
 248
 249
 250 bool MapgenV6::getHaveBeach(v2s16 p) {
 251         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 252         return getHaveBeach(index);
 253 }
 254
 255
 256 BiomeType MapgenV6::getBiome(v2s16 p) {
 257         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 258         return getBiome(index, p);
 259 }
 260
 261
 262 float MapgenV6::getHumidity(v2s16 p)
 263 {
 264         /*double noise = noise2d_perlin(
 265                 0.5+(float)p.X/500, 0.5+(float)p.Y/500,
 266                 seed+72384, 4, 0.66);
 267         noise = (noise + 1.0)/2.0;*/
 268
 269         float noise = NoisePerlin2D(np_humidity, p.X, p.Y, seed);
 270
 271         if (noise < 0.0)
 272                 noise = 0.0;
 273         if (noise > 1.0)
 274                 noise = 1.0;
 275         return noise;
 276 }
 277
 278
 279 float MapgenV6::getTreeAmount(v2s16 p)
 280 {
 281         /*double noise = noise2d_perlin(
 282                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 283                         seed+2, 4, 0.66);*/
 284
 285         float noise = NoisePerlin2D(np_trees, p.X, p.Y, seed);
 286         float zeroval = -0.39;
 287         if (noise < zeroval)
 288                 return 0;
 289         else
 290                 return 0.04 * (noise-zeroval) / (1.0-zeroval);
 291 }
 292
 293
 294 bool MapgenV6::getHaveAppleTree(v2s16 p)
 295 {
 296         /*is_apple_tree = noise2d_perlin(
 297                 0.5+(float)p.X/100, 0.5+(float)p.Z/100,
 298                 data->seed+342902, 3, 0.45) > 0.2;*/
 299
 300         float noise = NoisePerlin2D(np_apple_trees, p.X, p.Y, seed);
 301
 302         return noise > 0.2;
 303 }
 304
 305
 306 float MapgenV6::getMudAmount(int index)
 307 {
 308         if (flags & MG_FLAT)
 309                 return AVERAGE_MUD_AMOUNT;
 310
 311         /*return ((float)AVERAGE_MUD_AMOUNT + 2.0 * noise2d_perlin(
 312                         0.5+(float)p.X/200, 0.5+(float)p.Y/200,
 313                         seed+91013, 3, 0.55));*/
 314
 315         return noise_mud->result[index];
 316 }
 317
 318
 319 bool MapgenV6::getHaveBeach(int index)
 320 {
 321         // Determine whether to have sand here
 322         /*double sandnoise = noise2d_perlin(
 323                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 324                         seed+59420, 3, 0.50);*/
 325
 326         float sandnoise = noise_beach->result[index];
 327         return (sandnoise > freq_beach);
 328 }
 329
 330
 331 BiomeType MapgenV6::getBiome(int index, v2s16 p)
 332 {
 333         // Just do something very simple as for now
 334         /*double d = noise2d_perlin(
 335                         0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
 336                         seed+9130, 3, 0.50);*/
 337
 338         float d = noise_biome->result[index];
 339         if (d > freq_desert)
 340                 return BT_DESERT;
 341
 342         if ((flags & MGV6_BIOME_BLEND) &&
 343                 (d > freq_desert - 0.10) &&
 344                 ((noise2d(p.X, p.Y, seed) + 1.0) > (freq_desert - d) * 20.0))
 345                 return BT_DESERT;
 346
 347         return BT_NORMAL;
 348 }
 349
 350
 351 u32 MapgenV6::get_blockseed(u64 seed, v3s16 p)
 352 {
 353         s32 x=p.X, y=p.Y, z=p.Z;
 354         return (u32)(seed%0x100000000ULL) + z*38134234 + y*42123 + x*23;
 355 }
 356
 357
 358 //////////////////////// Map generator
 359
 360 void MapgenV6::makeChunk(BlockMakeData *data) {
 361         assert(data->vmanip);
 362         assert(data->nodedef);
 363         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 364                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 365                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 366         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 367                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 368                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 369
 370         this->generating = true;
 371         this->vm   = data->vmanip;
 372         this->ndef = data->nodedef;
 373
 374         // Hack: use minimum block coords for old code that assumes a single block
 375         v3s16 blockpos = data->blockpos_requested;
 376         v3s16 blockpos_min = data->blockpos_min;
 377         v3s16 blockpos_max = data->blockpos_max;
 378         v3s16 blockpos_full_min = blockpos_min - v3s16(1,1,1);
 379         v3s16 blockpos_full_max = blockpos_max + v3s16(1,1,1);
 380
 381         // Area of central chunk
 382         node_min = blockpos_min*MAP_BLOCKSIZE;
 383         node_max = (blockpos_max+v3s16(1,1,1))*MAP_BLOCKSIZE-v3s16(1,1,1);
 384
 385         // Full allocated area
 386         full_node_min = (blockpos_min-1)*MAP_BLOCKSIZE;
 387         full_node_max = (blockpos_max+2)*MAP_BLOCKSIZE-v3s16(1,1,1);
 388
 389         central_area_size = node_max - node_min + v3s16(1,1,1);
 390         assert(central_area_size.X == central_area_size.Z);
 391
 392         int volume_blocks = (blockpos_max.X - blockpos_min.X + 1)
 393                                           * (blockpos_max.Y - blockpos_min.Y + 1)
 394                                           * (blockpos_max.Z - blockpos_max.Z + 1);
 395
 396         volume_nodes = volume_blocks *
 397                 MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 398
 399         // Create a block-specific seed
 400         blockseed = get_blockseed(data->seed, full_node_min);
 401
 402         // Make some noise
 403         calculateNoise();
 404
 405         c_stone           = ndef->getId("mapgen_stone");
 406         c_dirt            = ndef->getId("mapgen_dirt");
 407         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
 408         c_sand            = ndef->getId("mapgen_sand");
 409         c_water_source    = ndef->getId("mapgen_water_source");
 410         c_lava_source     = ndef->getId("mapgen_lava_source");
 411         c_gravel          = ndef->getId("mapgen_gravel");
 412         c_cobble          = ndef->getId("mapgen_cobble");
 413         c_desert_sand     = ndef->getId("mapgen_desert_sand");
 414         c_desert_stone    = ndef->getId("mapgen_desert_stone");
 415         if (c_desert_sand == CONTENT_IGNORE)
 416                 c_desert_sand = c_sand;
 417         if (c_desert_stone == CONTENT_IGNORE)
 418                 c_desert_stone = c_stone;
 419
 420         // Maximum height of the stone surface and obstacles.
 421         // This is used to guide the cave generation
 422         s16 stone_surface_max_y;
 423
 424         // Generate general ground level to full area
 425         stone_surface_max_y = generateGround();
 426
 427         generateExperimental();
 428
 429         const s16 max_spread_amount = MAP_BLOCKSIZE;
 430         // Limit dirt flow area by 1 because mud is flown into neighbors.
 431         s16 mudflow_minpos = -max_spread_amount + 1;
 432         s16 mudflow_maxpos = central_area_size.X + max_spread_amount - 2;
 433
 434         // Loop this part, it will make stuff look older and newer nicely
 435         const u32 age_loops = 2;
 436         for (u32 i_age = 0; i_age < age_loops; i_age++) { // Aging loop
 437                 // Make caves (this code is relatively horrible)
 438                 if (flags & MG_CAVES)
 439                         generateCaves(stone_surface_max_y);
 440
 441                 // Add mud to the central chunk
 442                 addMud();
 443
 444                 // Add blobs of dirt and gravel underground
 445                 addDirtGravelBlobs();
 446
 447                 // Flow mud away from steep edges
 448                 flowMud(mudflow_minpos, mudflow_maxpos);
 449
 450         }
 451
 452         // Add dungeons
 453         if (flags & MG_DUNGEONS) {
 454                 DungeonGen dgen(ndef, data->seed, water_level);
 455                 dgen.generate(vm, blockseed, full_node_min, full_node_max);
 456         }
 457
 458         // Add top and bottom side of water to transforming_liquid queue
 459         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 460
 461         // Grow grass
 462         growGrass();
 463
 464         // Generate some trees, and add grass, if a jungle
 465         if (flags & MG_TREES)
 466                 placeTreesAndJungleGrass();
 467
 468         // Generate the registered ores
 469         for (unsigned int i = 0; i != emerge->ores.size(); i++) {
 470                 Ore *ore = emerge->ores[i];
 471                 ore->placeOre(this, blockseed + i, node_min, node_max);
 472         }
 473
 474         // Calculate lighting
 475         calcLighting(node_min - v3s16(1, 1, 1) * MAP_BLOCKSIZE,
 476                                  node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE);
 477
 478         this->generating = false;
 479 }
 480
 481
 482 void MapgenV6::calculateNoise() {
 483         int x = node_min.X;
 484         int z = node_min.Z;
 485
 486         // Need to adjust for the original implementation's +.5 offset...
 487         if (!(flags & MG_FLAT)) {
 488                 noise_terrain_base->perlinMap2D(
 489                         x + 0.5 * noise_terrain_base->np->spread.X,
 490                         z + 0.5 * noise_terrain_base->np->spread.Z);
 491                 noise_terrain_base->transformNoiseMap();
 492
 493                 noise_terrain_higher->perlinMap2D(
 494                         x + 0.5 * noise_terrain_higher->np->spread.X,
 495                         z + 0.5 * noise_terrain_higher->np->spread.Z);
 496                 noise_terrain_higher->transformNoiseMap();
 497
 498                 noise_steepness->perlinMap2D(
 499                         x + 0.5 * noise_steepness->np->spread.X,
 500                         z + 0.5 * noise_steepness->np->spread.Z);
 501                 noise_steepness->transformNoiseMap();
 502
 503                 noise_height_select->perlinMap2D(
 504                         x + 0.5 * noise_height_select->np->spread.X,
 505                         z + 0.5 * noise_height_select->np->spread.Z);
 506
 507                 noise_mud->perlinMap2D(
 508                         x + 0.5 * noise_mud->np->spread.X,
 509                         z + 0.5 * noise_mud->np->spread.Z);
 510                 noise_mud->transformNoiseMap();
 511         }
 512
 513         noise_beach->perlinMap2D(
 514                 x + 0.2 * noise_beach->np->spread.X,
 515                 z + 0.7 * noise_beach->np->spread.Z);
 516
 517         noise_biome->perlinMap2D(
 518                 x + 0.6 * noise_biome->np->spread.X,
 519                 z + 0.2 * noise_biome->np->spread.Z);
 520 }
 521
 522
 523 int MapgenV6::generateGround() {
 524         //TimeTaker timer1("Generating ground level");
 525         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 526         MapNode n_stone(c_stone), n_desert_stone(c_desert_stone);
 527         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 528         u32 index = 0;
 529
 530         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 531         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 532                 // Surface height
 533                 s16 surface_y = (s16)baseTerrainLevelFromMap(index);
 534
 535                 // Log it
 536                 if (surface_y > stone_surface_max_y)
 537                         stone_surface_max_y = surface_y;
 538
 539                 BiomeType bt = getBiome(index, v2s16(x, z));
 540
 541                 // Fill ground with stone
 542                 v3s16 em = vm->m_area.getExtent();
 543                 u32 i = vm->m_area.index(x, node_min.Y, z);
 544                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 545                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 546                                 if (y <= surface_y) {
 547                                         vm->m_data[i] = (y > water_level && bt == BT_DESERT) ?
 548                                                 n_desert_stone : n_stone;
 549                                 } else if (y <= water_level) {
 550                                         vm->m_data[i] = n_water_source;
 551                                 } else {
 552                                         vm->m_data[i] = n_air;
 553                                 }
 554                         }
 555                         vm->m_area.add_y(em, i, 1);
 556                 }
 557         }
 558
 559         return stone_surface_max_y;
 560 }
 561
 562
 563 void MapgenV6::addMud() {
 564         // 15ms @cs=8
 565         //TimeTaker timer1("add mud");
 566         MapNode n_dirt(c_dirt), n_gravel(c_gravel);
 567         MapNode n_sand(c_sand), n_desert_sand(c_desert_sand);
 568         MapNode addnode;
 569
 570         u32 index = 0;
 571         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 572         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 573                 // Randomize mud amount
 574                 s16 mud_add_amount = getMudAmount(index) / 2.0 + 0.5;
 575
 576                 // Find ground level
 577                 s16 surface_y = find_stone_level(v2s16(x, z)); /////////////////optimize this!
 578
 579                 // Handle area not found
 580                 if (surface_y == vm->m_area.MinEdge.Y - 1)
 581                         continue;
 582
 583                 BiomeType bt = getBiome(index, v2s16(x, z));
 584                 addnode = (bt == BT_DESERT) ? n_desert_sand : n_dirt;
 585
 586                 if (bt == BT_DESERT && surface_y + mud_add_amount <= water_level + 1) {
 587                         addnode = n_sand;
 588                 } else if (mud_add_amount <= 0) {
 589                         mud_add_amount = 1 - mud_add_amount;
 590                         addnode = n_gravel;
 591                 } else if (bt == BT_NORMAL && getHaveBeach(index) &&
 592                                 surface_y + mud_add_amount <= water_level + 2) {
 593                         addnode = n_sand;
 594                 }
 595
 596                 if (bt == BT_DESERT && surface_y > 20)
 597                         mud_add_amount = MYMAX(0, mud_add_amount - (surface_y - 20) / 5);
 598
 599                 // If topmost node is grass, change it to mud.  It might be if it was
 600                 // flown to there from a neighboring chunk and then converted.
 601                 u32 i = vm->m_area.index(x, surface_y, z);
 602                 if (vm->m_data[i].getContent() == c_dirt_with_grass)
 603                         vm->m_data[i] = n_dirt;
 604
 605                 // Add mud on ground
 606                 s16 mudcount = 0;
 607                 v3s16 em = vm->m_area.getExtent();
 608                 s16 y_start = surface_y + 1;
 609                 i = vm->m_area.index(x, y_start, z);
 610                 for (s16 y = y_start; y <= node_max.Y; y++) {
 611                         if (mudcount >= mud_add_amount)
 612                                 break;
 613
 614                         vm->m_data[i] = addnode;
 615                         mudcount++;
 616
 617                         vm->m_area.add_y(em, i, 1);
 618                 }
 619         }
 620 }
 621
 622
 623 void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos) {
 624         // 340ms @cs=8
 625         TimeTaker timer1("flow mud");
 626
 627         // Iterate a few times
 628         for(s16 k = 0; k < 3; k++) {
 629                 for (s16 z = mudflow_minpos; z <= mudflow_maxpos; z++)
 630                 for (s16 x = mudflow_minpos; x <= mudflow_maxpos; x++) {
 631                         // Invert coordinates every 2nd iteration
 632                         if (k % 2 == 0) {
 633                                 x = mudflow_maxpos - (x - mudflow_minpos);
 634                                 z = mudflow_maxpos - (z - mudflow_minpos);
 635                         }
 636
 637                         // Node position in 2d
 638                         v2s16 p2d = v2s16(node_min.X, node_min.Z) + v2s16(x, z);
 639
 640                         v3s16 em = vm->m_area.getExtent();
 641                         u32 i = vm->m_area.index(p2d.X, node_max.Y, p2d.Y);
 642                         s16 y = node_max.Y;
 643
 644                         while(y >= node_min.Y)
 645                         {
 646
 647                         for(;; y--)
 648                         {
 649                                 MapNode *n = NULL;
 650                                 // Find mud
 651                                 for(; y >= node_min.Y; y--) {
 652                                         n = &vm->m_data[i];
 653                                         if (n->getContent() == c_dirt ||
 654                                                 n->getContent() == c_dirt_with_grass ||
 655                                                 n->getContent() == c_gravel)
 656                                                 break;
 657
 658                                         vm->m_area.add_y(em, i, -1);
 659                                 }
 660
 661                                 // Stop if out of area
 662                                 //if(vmanip.m_area.contains(i) == false)
 663                                 if (y < node_min.Y)
 664                                         break;
 665
 666                                 if (n->getContent() == c_dirt ||
 667                                         n->getContent() == c_dirt_with_grass)
 668                                 {
 669                                         // Make it exactly mud
 670                                         n->setContent(c_dirt);
 671
 672                                         // Don't flow it if the stuff under it is not mud
 673                                         {
 674                                                 u32 i2 = i;
 675                                                 vm->m_area.add_y(em, i2, -1);
 676                                                 // Cancel if out of area
 677                                                 if(vm->m_area.contains(i2) == false)
 678                                                         continue;
 679                                                 MapNode *n2 = &vm->m_data[i2];
 680                                                 if (n2->getContent() != c_dirt &&
 681                                                         n2->getContent() != c_dirt_with_grass)
 682                                                         continue;
 683                                         }
 684                                 }
 685
 686                                 v3s16 dirs4[4] = {
 687                                         v3s16(0,0,1), // back
 688                                         v3s16(1,0,0), // right
 689                                         v3s16(0,0,-1), // front
 690                                         v3s16(-1,0,0), // left
 691                                 };
 692
 693                                 // Check that upper is air or doesn't exist.
 694                                 // Cancel dropping if upper keeps it in place
 695                                 u32 i3 = i;
 696                                 vm->m_area.add_y(em, i3, 1);
 697                                 if (vm->m_area.contains(i3) == true &&
 698                                         ndef->get(vm->m_data[i3]).walkable)
 699                                         continue;
 700
 701                                 // Drop mud on side
 702                                 for(u32 di=0; di<4; di++) {
 703                                         v3s16 dirp = dirs4[di];
 704                                         u32 i2 = i;
 705                                         // Move to side
 706                                         vm->m_area.add_p(em, i2, dirp);
 707                                         // Fail if out of area
 708                                         if (vm->m_area.contains(i2) == false)
 709                                                 continue;
 710                                         // Check that side is air
 711                                         MapNode *n2 = &vm->m_data[i2];
 712                                         if (ndef->get(*n2).walkable)
 713                                                 continue;
 714                                         // Check that under side is air
 715                                         vm->m_area.add_y(em, i2, -1);
 716                                         if (vm->m_area.contains(i2) == false)
 717                                                 continue;
 718                                         n2 = &vm->m_data[i2];
 719                                         if (ndef->get(*n2).walkable)
 720                                                 continue;
 721                                         // Loop further down until not air
 722                                         bool dropped_to_unknown = false;
 723                                         do {
 724                                                 vm->m_area.add_y(em, i2, -1);
 725                                                 n2 = &vm->m_data[i2];
 726                                                 // if out of known area
 727                                                 if(vm->m_area.contains(i2) == false ||
 728                                                         n2->getContent() == CONTENT_IGNORE) {
 729                                                         dropped_to_unknown = true;
 730                                                         break;
 731                                                 }
 732                                         } while (ndef->get(*n2).walkable == false);
 733                                         // Loop one up so that we're in air
 734                                         vm->m_area.add_y(em, i2, 1);
 735                                         n2 = &vm->m_data[i2];
 736
 737                                         bool old_is_water = (n->getContent() == c_water_source);
 738                                         // Move mud to new place
 739                                         if (!dropped_to_unknown) {
 740                                                 *n2 = *n;
 741                                                 // Set old place to be air (or water)
 742                                                 if(old_is_water)
 743                                                         *n = MapNode(c_water_source);
 744                                                 else
 745                                                         *n = MapNode(CONTENT_AIR);
 746                                         }
 747
 748                                         // Done
 749                                         break;
 750                                 }
 751                         }
 752                         }
 753                 }
 754         }
 755 }
 756
 757
 758 void MapgenV6::addDirtGravelBlobs() {
 759         if (getBiome(v2s16(node_min.X, node_min.Z)) != BT_NORMAL)
 760                 return;
 761
 762         PseudoRandom pr(blockseed + 983);
 763         for (int i = 0; i < volume_nodes/10/10/10; i++) {
 764                 bool only_fill_cave = (myrand_range(0,1) != 0);
 765                 v3s16 size(
 766                         pr.range(1, 8),
 767                         pr.range(1, 8),
 768                         pr.range(1, 8)
 769                 );
 770                 v3s16 p0(
 771                         pr.range(node_min.X, node_max.X) - size.X / 2,
 772                         pr.range(node_min.Y, node_max.Y) - size.Y / 2,
 773                         pr.range(node_min.Z, node_max.Z) - size.Z / 2
 774                 );
 775
 776                 MapNode n1((p0.Y > -32 && !pr.range(0, 1)) ? c_dirt : c_gravel);
 777                 for (int z1 = 0; z1 < size.Z; z1++)
 778                 for (int y1 = 0; y1 < size.Y; y1++)
 779                 for (int x1 = 0; x1 < size.X; x1++) {
 780                         v3s16 p = p0 + v3s16(x1, y1, z1);
 781                         u32 i = vm->m_area.index(p);
 782                         if (!vm->m_area.contains(i))
 783                                 continue;
 784                         // Cancel if not stone and not cave air
 785                         if (vm->m_data[i].getContent() != c_stone &&
 786                                 !(vm->m_flags[i] & VMANIP_FLAG_CAVE))
 787                                 continue;
 788                         if (only_fill_cave && !(vm->m_flags[i] & VMANIP_FLAG_CAVE))
 789                                 continue;
 790                         vm->m_data[i] = n1;
 791                 }
 792         }
 793 }
 794
 795
 796 void MapgenV6::placeTreesAndJungleGrass() {
 797         //TimeTaker t("placeTrees");
 798         if (node_max.Y < water_level)
 799                 return;
 800
 801         PseudoRandom grassrandom(blockseed + 53);
 802         content_t c_junglegrass = ndef->getId("mapgen_junglegrass");
 803         // if we don't have junglegrass, don't place cignore... that's bad
 804         if (c_junglegrass == CONTENT_IGNORE)
 805                 c_junglegrass = CONTENT_AIR;
 806         MapNode n_junglegrass(c_junglegrass);
 807         v3s16 em = vm->m_area.getExtent();
 808
 809         // Divide area into parts
 810         s16 div = 8;
 811         s16 sidelen = central_area_size.X / div;
 812         double area = sidelen * sidelen;
 813
 814         // N.B.  We must add jungle grass first, since tree leaves will
 815         // obstruct the ground, giving us a false ground level
 816         for (s16 z0 = 0; z0 < div; z0++)
 817         for (s16 x0 = 0; x0 < div; x0++) {
 818                 // Center position of part of division
 819                 v2s16 p2d_center(
 820                         node_min.X + sidelen / 2 + sidelen * x0,
 821                         node_min.Z + sidelen / 2 + sidelen * z0
 822                 );
 823                 // Minimum edge of part of division
 824                 v2s16 p2d_min(
 825                         node_min.X + sidelen * x0,
 826                         node_min.Z + sidelen * z0
 827                 );
 828                 // Maximum edge of part of division
 829                 v2s16 p2d_max(
 830                         node_min.X + sidelen + sidelen * x0 - 1,
 831                         node_min.Z + sidelen + sidelen * z0 - 1
 832                 );
 833
 834                 // Amount of trees, jungle area
 835                 u32 tree_count = area * getTreeAmount(p2d_center);
 836
 837                 float humidity;
 838                 bool is_jungle = false;
 839                 if (flags & MGV6_JUNGLES) {
 840                         humidity = getHumidity(p2d_center);
 841                         if (humidity > 0.75) {
 842                                 is_jungle = true;
 843                                 tree_count *= 4;
 844                         }
 845                 }
 846
 847                 // Add jungle grass
 848                 if (is_jungle) {
 849                         u32 grass_count = 5 * humidity * tree_count;
 850                         for (u32 i = 0; i < grass_count; i++) {
 851                                 s16 x = grassrandom.range(p2d_min.X, p2d_max.X);
 852                                 s16 z = grassrandom.range(p2d_min.Y, p2d_max.Y);
 853
 854                                 s16 y = find_ground_level(v2s16(x, z)); ////////////////optimize this!
 855                                 if (y < water_level || y < node_min.Y || y > node_max.Y)
 856                                         continue;
 857
 858                                 u32 vi = vm->m_area.index(x, y, z);
 859                                 // place on dirt_with_grass, since we know it is exposed to sunlight
 860                                 if (vm->m_data[vi].getContent() == c_dirt_with_grass) {
 861                                         vm->m_area.add_y(em, vi, 1);
 862                                         vm->m_data[vi] = n_junglegrass;
 863                                 }
 864                         }
 865                 }
 866
 867                 // Put trees in random places on part of division
 868                 for (u32 i = 0; i < tree_count; i++) {
 869                         s16 x = myrand_range(p2d_min.X, p2d_max.X);
 870                         s16 z = myrand_range(p2d_min.Y, p2d_max.Y);
 871                         s16 y = find_ground_level(v2s16(x, z)); ////////////////////optimize this!
 872                         // Don't make a tree under water level
 873                         // Don't make a tree so high that it doesn't fit
 874                         if(y < water_level || y > node_max.Y - 6)
 875                                 continue;
 876
 877                         v3s16 p(x,y,z);
 878                         // Trees grow only on mud and grass
 879                         {
 880                                 u32 i = vm->m_area.index(p);
 881                                 MapNode *n = &vm->m_data[i];
 882                                 if (n->getContent() != c_dirt &&
 883                                         n->getContent() != c_dirt_with_grass)
 884                                         continue;
 885                         }
 886                         p.Y++;
 887
 888                         // Make a tree
 889                         if (is_jungle) {
 890                                 treegen::make_jungletree(*vm, p, ndef, myrand());
 891                         } else {
 892                                 bool is_apple_tree = (myrand_range(0, 3) == 0) &&
 893                                                                                 getHaveAppleTree(v2s16(x, z));
 894                                 treegen::make_tree(*vm, p, is_apple_tree, ndef, myrand());
 895                         }
 896                 }
 897         }
 898         //printf("placeTreesAndJungleGrass: %dms\n", t.stop());
 899 }
 900
 901
 902 void MapgenV6::growGrass() {
 903         for (s16 z = full_node_min.Z; z <= full_node_max.Z; z++)
 904         for (s16 x = full_node_min.X; x <= full_node_max.X; x++) {
 905                 // Find the lowest surface to which enough light ends up to make
 906                 // grass grow.  Basically just wait until not air and not leaves.
 907                 s16 surface_y = 0;
 908                 {
 909                         v3s16 em = vm->m_area.getExtent();
 910                         u32 i = vm->m_area.index(x, node_max.Y, z);
 911                         s16 y;
 912                         // Go to ground level
 913                         for (y = node_max.Y; y >= full_node_min.Y; y--) {
 914                                 MapNode &n = vm->m_data[i];
 915                                 if (ndef->get(n).param_type != CPT_LIGHT ||
 916                                         ndef->get(n).liquid_type != LIQUID_NONE)
 917                                         break;
 918                                 vm->m_area.add_y(em, i, -1);
 919                         }
 920                         surface_y = (y >= full_node_min.Y) ? y : full_node_min.Y;
 921                 }
 922
 923                 u32 i = vm->m_area.index(x, surface_y, z);
 924                 MapNode *n = &vm->m_data[i];
 925                 if (n->getContent() == c_dirt && surface_y >= water_level - 20)
 926                         n->setContent(c_dirt_with_grass);
 927         }
 928 }
 929
 930
 931 void MapgenV6::generateCaves(int max_stone_y) {
 932         float cave_amount = NoisePerlin2D(np_cave, node_min.X, node_min.Y, seed);
 933         int volume_nodes = (node_max.X - node_min.X + 1) *
 934                                            (node_max.Y - node_min.Y + 1) * MAP_BLOCKSIZE;
 935         cave_amount = MYMAX(0.0, cave_amount);
 936         u32 caves_count = cave_amount * volume_nodes / 50000;
 937         u32 bruises_count = 1;
 938         PseudoRandom ps(blockseed + 21343);
 939         PseudoRandom ps2(blockseed + 1032);
 940
 941         if (ps.range(1, 6) == 1)
 942                 bruises_count = ps.range(0, ps.range(0, 2));
 943
 944         if (getBiome(v2s16(node_min.X, node_min.Z)) == BT_DESERT) {
 945                 caves_count   /= 3;
 946                 bruises_count /= 3;
 947         }
 948
 949         for (u32 i = 0; i < caves_count + bruises_count; i++) {
 950                 bool large_cave = (i >= caves_count);
 951                 CaveV6 cave(this, &ps, &ps2, large_cave, c_water_source, c_lava_source);
 952
 953                 cave.makeCave(node_min, node_max, max_stone_y);
 954         }
 955 }