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