src/mapgen_v6.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 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
  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 "serverobject.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "voxelalgorithms.h"
  31 //#include "profiler.h" // For TimeTaker
  32 #include "settings.h" // For g_settings
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.h"
  36 #include "treegen.h"
  37 #include "mg_ore.h"
  38 #include "mg_decoration.h"
  39 #include "mapgen_v6.h"
  40
  41
  42 FlagDesc flagdesc_mapgen_v6[] = {
  43         {"jungles",    MGV6_JUNGLES},
  44         {"biomeblend", MGV6_BIOMEBLEND},
  45         {"mudflow",    MGV6_MUDFLOW},
  46         {"snowbiomes", MGV6_SNOWBIOMES},
  47         {"flat",       MGV6_FLAT},
  48         {"trees",      MGV6_TREES},
  49         {NULL,         0}
  50 };
  51
  52
  53 /////////////////////////////////////////////////////////////////////////////
  54
  55
  56 MapgenV6::MapgenV6(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  57         : Mapgen(mapgenid, params, emerge)
  58 {
  59         this->m_emerge = emerge;
  60         this->ystride = csize.X; //////fix this
  61
  62         this->heightmap = new s16[csize.X * csize.Z];
  63
  64         MapgenV6Params *sp = (MapgenV6Params *)params->sparams;
  65         this->spflags     = sp->spflags;
  66         this->freq_desert = sp->freq_desert;
  67         this->freq_beach  = sp->freq_beach;
  68
  69         np_cave        = &sp->np_cave;
  70         np_humidity    = &sp->np_humidity;
  71         np_trees       = &sp->np_trees;
  72         np_apple_trees = &sp->np_apple_trees;
  73
  74         //// Create noise objects
  75         noise_terrain_base   = new Noise(&sp->np_terrain_base,   seed, csize.X, csize.Y);
  76         noise_terrain_higher = new Noise(&sp->np_terrain_higher, seed, csize.X, csize.Y);
  77         noise_steepness      = new Noise(&sp->np_steepness,      seed, csize.X, csize.Y);
  78         noise_height_select  = new Noise(&sp->np_height_select,  seed, csize.X, csize.Y);
  79         noise_mud            = new Noise(&sp->np_mud,            seed, csize.X, csize.Y);
  80         noise_beach          = new Noise(&sp->np_beach,          seed, csize.X, csize.Y);
  81         noise_biome          = new Noise(&sp->np_biome,          seed,
  82                         csize.X + 2 * MAP_BLOCKSIZE, csize.Y + 2 * MAP_BLOCKSIZE);
  83         noise_humidity       = new Noise(&sp->np_humidity,       seed,
  84                         csize.X + 2 * MAP_BLOCKSIZE, csize.Y + 2 * MAP_BLOCKSIZE);
  85
  86         //// Resolve nodes to be used
  87         INodeDefManager *ndef = emerge->ndef;
  88
  89         c_stone           = ndef->getId("mapgen_stone");
  90         c_dirt            = ndef->getId("mapgen_dirt");
  91         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  92         c_sand            = ndef->getId("mapgen_sand");
  93         c_water_source    = ndef->getId("mapgen_water_source");
  94         c_lava_source     = ndef->getId("mapgen_lava_source");
  95         c_gravel          = ndef->getId("mapgen_gravel");
  96         c_desert_stone    = ndef->getId("mapgen_desert_stone");
  97         c_desert_sand     = ndef->getId("mapgen_desert_sand");
  98         c_dirt_with_snow  = ndef->getId("mapgen_dirt_with_snow");
  99         c_snow            = ndef->getId("mapgen_snow");
 100         c_snowblock       = ndef->getId("mapgen_snowblock");
 101         c_ice             = ndef->getId("mapgen_ice");
 102
 103         c_cobble          = ndef->getId("mapgen_cobble");
 104         c_stair_cobble    = ndef->getId("mapgen_stair_cobble");
 105         c_mossycobble     = ndef->getId("mapgen_mossycobble");
 106
 107         if (c_desert_sand == CONTENT_IGNORE)
 108                 c_desert_sand = c_sand;
 109         if (c_desert_stone == CONTENT_IGNORE)
 110                 c_desert_stone = c_stone;
 111         if (c_mossycobble == CONTENT_IGNORE)
 112                 c_mossycobble = c_cobble;
 113         if (c_stair_cobble == CONTENT_IGNORE)
 114                 c_stair_cobble = c_cobble;
 115         if (c_dirt_with_snow == CONTENT_IGNORE)
 116                 c_dirt_with_snow = c_dirt_with_grass;
 117         if (c_snow == CONTENT_IGNORE)
 118                 c_snow = CONTENT_AIR;
 119         if (c_snowblock == CONTENT_IGNORE)
 120                 c_snowblock = c_dirt_with_grass;
 121         if (c_ice == CONTENT_IGNORE)
 122                 c_ice = c_water_source;
 123 }
 124
 125
 126 MapgenV6::~MapgenV6()
 127 {
 128         delete noise_terrain_base;
 129         delete noise_terrain_higher;
 130         delete noise_steepness;
 131         delete noise_height_select;
 132         delete noise_mud;
 133         delete noise_beach;
 134         delete noise_biome;
 135         delete noise_humidity;
 136
 137         delete[] heightmap;
 138 }
 139
 140
 141 MapgenV6Params::MapgenV6Params()
 142 {
 143         spflags     = MGV6_BIOMEBLEND | MGV6_MUDFLOW;
 144         freq_desert = 0.45;
 145         freq_beach  = 0.15;
 146
 147         np_terrain_base   = NoiseParams(-4,   20.0, v3f(250.0, 250.0, 250.0), 82341,  5, 0.6,  2.0);
 148         np_terrain_higher = NoiseParams(20,   16.0, v3f(500.0, 500.0, 500.0), 85039,  5, 0.6,  2.0);
 149         np_steepness      = NoiseParams(0.85, 0.5,  v3f(125.0, 125.0, 125.0), -932,   5, 0.7,  2.0);
 150         np_height_select  = NoiseParams(0,    1.0,  v3f(250.0, 250.0, 250.0), 4213,   5, 0.69, 2.0);
 151         np_mud            = NoiseParams(4,    2.0,  v3f(200.0, 200.0, 200.0), 91013,  3, 0.55, 2.0);
 152         np_beach          = NoiseParams(0,    1.0,  v3f(250.0, 250.0, 250.0), 59420,  3, 0.50, 2.0);
 153         np_biome          = NoiseParams(0,    1.0,  v3f(500.0, 500.0, 500.0), 9130,   3, 0.50, 2.0);
 154         np_cave           = NoiseParams(6,    6.0,  v3f(250.0, 250.0, 250.0), 34329,  3, 0.50, 2.0);
 155         np_humidity       = NoiseParams(0.5,  0.5,  v3f(500.0, 500.0, 500.0), 72384,  3, 0.50, 2.0);
 156         np_trees          = NoiseParams(0,    1.0,  v3f(125.0, 125.0, 125.0), 2,      4, 0.66, 2.0);
 157         np_apple_trees    = NoiseParams(0,    1.0,  v3f(100.0, 100.0, 100.0), 342902, 3, 0.45, 2.0);
 158 }
 159
 160
 161 void MapgenV6Params::readParams(const Settings *settings)
 162 {
 163         settings->getFlagStrNoEx("mgv6_spflags", spflags, flagdesc_mapgen_v6);
 164         settings->getFloatNoEx("mgv6_freq_desert", freq_desert);
 165         settings->getFloatNoEx("mgv6_freq_beach",  freq_beach);
 166
 167         settings->getNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 168         settings->getNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 169         settings->getNoiseParams("mgv6_np_steepness",      np_steepness);
 170         settings->getNoiseParams("mgv6_np_height_select",  np_height_select);
 171         settings->getNoiseParams("mgv6_np_mud",            np_mud);
 172         settings->getNoiseParams("mgv6_np_beach",          np_beach);
 173         settings->getNoiseParams("mgv6_np_biome",          np_biome);
 174         settings->getNoiseParams("mgv6_np_cave",           np_cave);
 175         settings->getNoiseParams("mgv6_np_humidity",       np_humidity);
 176         settings->getNoiseParams("mgv6_np_trees",          np_trees);
 177         settings->getNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 178 }
 179
 180
 181 void MapgenV6Params::writeParams(Settings *settings) const
 182 {
 183         settings->setFlagStr("mgv6_spflags", spflags, flagdesc_mapgen_v6, U32_MAX);
 184         settings->setFloat("mgv6_freq_desert", freq_desert);
 185         settings->setFloat("mgv6_freq_beach",  freq_beach);
 186
 187         settings->setNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 188         settings->setNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 189         settings->setNoiseParams("mgv6_np_steepness",      np_steepness);
 190         settings->setNoiseParams("mgv6_np_height_select",  np_height_select);
 191         settings->setNoiseParams("mgv6_np_mud",            np_mud);
 192         settings->setNoiseParams("mgv6_np_beach",          np_beach);
 193         settings->setNoiseParams("mgv6_np_biome",          np_biome);
 194         settings->setNoiseParams("mgv6_np_cave",           np_cave);
 195         settings->setNoiseParams("mgv6_np_humidity",       np_humidity);
 196         settings->setNoiseParams("mgv6_np_trees",          np_trees);
 197         settings->setNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 198 }
 199
 200
 201 //////////////////////// Some helper functions for the map generator
 202
 203 // Returns Y one under area minimum if not found
 204 s16 MapgenV6::find_stone_level(v2s16 p2d)
 205 {
 206         v3s16 em = vm->m_area.getExtent();
 207         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 208         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 209         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 210         s16 y;
 211
 212         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 213                 content_t c = vm->m_data[i].getContent();
 214                 if (c != CONTENT_IGNORE && (c == c_stone || c == c_desert_stone))
 215                         break;
 216
 217                 vm->m_area.add_y(em, i, -1);
 218         }
 219         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 220 }
 221
 222
 223 // Required by mapgen.h
 224 bool MapgenV6::block_is_underground(u64 seed, v3s16 blockpos)
 225 {
 226         /*s16 minimum_groundlevel = (s16)get_sector_minimum_ground_level(
 227                         seed, v2s16(blockpos.X, blockpos.Z));*/
 228         // Nah, this is just a heuristic, just return something
 229         s16 minimum_groundlevel = water_level;
 230
 231         if(blockpos.Y * MAP_BLOCKSIZE + MAP_BLOCKSIZE <= minimum_groundlevel)
 232                 return true;
 233         else
 234                 return false;
 235 }
 236
 237
 238 //////////////////////// Base terrain height functions
 239
 240 float MapgenV6::baseTerrainLevel(float terrain_base, float terrain_higher,
 241         float steepness, float height_select)
 242 {
 243         float base   = 1 + terrain_base;
 244         float higher = 1 + terrain_higher;
 245
 246         // Limit higher ground level to at least base
 247         if(higher < base)
 248                 higher = base;
 249
 250         // Steepness factor of cliffs
 251         float b = steepness;
 252         b = rangelim(b, 0.0, 1000.0);
 253         b = 5 * b * b * b * b * b * b * b;
 254         b = rangelim(b, 0.5, 1000.0);
 255
 256         // Values 1.5...100 give quite horrible looking slopes
 257         if (b > 1.5 && b < 100.0)
 258                 b = (b < 10.0) ? 1.5 : 100.0;
 259
 260         float a_off = -0.20; // Offset to more low
 261         float a = 0.5 + b * (a_off + height_select);
 262         a = rangelim(a, 0.0, 1.0); // Limit
 263
 264         return base * (1.0 - a) + higher * a;
 265 }
 266
 267
 268 float MapgenV6::baseTerrainLevelFromNoise(v2s16 p)
 269 {
 270         if ((spflags & MGV6_FLAT) || (flags & MG_FLAT))
 271                 return water_level;
 272
 273         float terrain_base   = NoisePerlin2D_PO(&noise_terrain_base->np,
 274                                                         p.X, 0.5, p.Y, 0.5, seed);
 275         float terrain_higher = NoisePerlin2D_PO(&noise_terrain_higher->np,
 276                                                         p.X, 0.5, p.Y, 0.5, seed);
 277         float steepness      = NoisePerlin2D_PO(&noise_steepness->np,
 278                                                         p.X, 0.5, p.Y, 0.5, seed);
 279         float height_select  = NoisePerlin2D_PO(&noise_height_select->np,
 280                                                         p.X, 0.5, p.Y, 0.5, seed);
 281
 282         return baseTerrainLevel(terrain_base, terrain_higher,
 283                                                         steepness, height_select);
 284 }
 285
 286
 287 float MapgenV6::baseTerrainLevelFromMap(v2s16 p)
 288 {
 289         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 290         return baseTerrainLevelFromMap(index);
 291 }
 292
 293
 294 float MapgenV6::baseTerrainLevelFromMap(int index)
 295 {
 296         if ((spflags & MGV6_FLAT) || (flags & MG_FLAT))
 297                 return water_level;
 298
 299         float terrain_base   = noise_terrain_base->result[index];
 300         float terrain_higher = noise_terrain_higher->result[index];
 301         float steepness      = noise_steepness->result[index];
 302         float height_select  = noise_height_select->result[index];
 303
 304         return baseTerrainLevel(terrain_base, terrain_higher,
 305                                                         steepness, height_select);
 306 }
 307
 308
 309 s16 MapgenV6::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision)
 310 {
 311         return baseTerrainLevelFromNoise(p2d) + MGV6_AVERAGE_MUD_AMOUNT;
 312 }
 313
 314
 315 int MapgenV6::getGroundLevelAtPoint(v2s16 p)
 316 {
 317         return baseTerrainLevelFromNoise(p) + MGV6_AVERAGE_MUD_AMOUNT;
 318 }
 319
 320
 321 int MapgenV6::getSpawnLevelAtPoint(v2s16 p)
 322 {
 323         s16 level_at_point = baseTerrainLevelFromNoise(p) + MGV6_AVERAGE_MUD_AMOUNT;
 324         if (level_at_point <= water_level ||
 325                         level_at_point > water_level + 16)
 326                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 327         else
 328                 return level_at_point;
 329 }
 330
 331
 332 //////////////////////// Noise functions
 333
 334 float MapgenV6::getMudAmount(v2s16 p)
 335 {
 336         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 337         return getMudAmount(index);
 338 }
 339
 340
 341 bool MapgenV6::getHaveBeach(v2s16 p)
 342 {
 343         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 344         return getHaveBeach(index);
 345 }
 346
 347
 348 BiomeV6Type MapgenV6::getBiome(v2s16 p)
 349 {
 350         int index = (p.Y - full_node_min.Z) * (ystride + 2 * MAP_BLOCKSIZE)
 351                         + (p.X - full_node_min.X);
 352         return getBiome(index, p);
 353 }
 354
 355
 356 float MapgenV6::getHumidity(v2s16 p)
 357 {
 358         /*double noise = noise2d_perlin(
 359                 0.5+(float)p.X/500, 0.5+(float)p.Y/500,
 360                 seed+72384, 4, 0.66);
 361         noise = (noise + 1.0)/2.0;*/
 362
 363         int index = (p.Y - full_node_min.Z) * (ystride + 2 * MAP_BLOCKSIZE)
 364                         + (p.X - full_node_min.X);
 365         float noise = noise_humidity->result[index];
 366
 367         if (noise < 0.0)
 368                 noise = 0.0;
 369         if (noise > 1.0)
 370                 noise = 1.0;
 371         return noise;
 372 }
 373
 374
 375 float MapgenV6::getTreeAmount(v2s16 p)
 376 {
 377         /*double noise = noise2d_perlin(
 378                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 379                         seed+2, 4, 0.66);*/
 380
 381         float noise = NoisePerlin2D(np_trees, p.X, p.Y, seed);
 382         float zeroval = -0.39;
 383         if (noise < zeroval)
 384                 return 0;
 385         else
 386                 return 0.04 * (noise - zeroval) / (1.0 - zeroval);
 387 }
 388
 389
 390 bool MapgenV6::getHaveAppleTree(v2s16 p)
 391 {
 392         /*is_apple_tree = noise2d_perlin(
 393                 0.5+(float)p.X/100, 0.5+(float)p.Z/100,
 394                 data->seed+342902, 3, 0.45) > 0.2;*/
 395
 396         float noise = NoisePerlin2D(np_apple_trees, p.X, p.Y, seed);
 397
 398         return noise > 0.2;
 399 }
 400
 401
 402 float MapgenV6::getMudAmount(int index)
 403 {
 404         if ((spflags & MGV6_FLAT) || (flags & MG_FLAT))
 405                 return MGV6_AVERAGE_MUD_AMOUNT;
 406
 407         /*return ((float)AVERAGE_MUD_AMOUNT + 2.0 * noise2d_perlin(
 408                         0.5+(float)p.X/200, 0.5+(float)p.Y/200,
 409                         seed+91013, 3, 0.55));*/
 410
 411         return noise_mud->result[index];
 412 }
 413
 414
 415 bool MapgenV6::getHaveBeach(int index)
 416 {
 417         // Determine whether to have sand here
 418         /*double sandnoise = noise2d_perlin(
 419                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 420                         seed+59420, 3, 0.50);*/
 421
 422         float sandnoise = noise_beach->result[index];
 423         return (sandnoise > freq_beach);
 424 }
 425
 426
 427 BiomeV6Type MapgenV6::getBiome(int index, v2s16 p)
 428 {
 429         // Just do something very simple as for now
 430         /*double d = noise2d_perlin(
 431                         0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
 432                         seed+9130, 3, 0.50);*/
 433
 434         float d = noise_biome->result[index];
 435         float h = noise_humidity->result[index];
 436
 437         if (spflags & MGV6_SNOWBIOMES) {
 438                 float blend = (spflags & MGV6_BIOMEBLEND) ? noise2d(p.X, p.Y, seed) / 40 : 0;
 439
 440                 if (d > MGV6_FREQ_HOT + blend) {
 441                         if (h > MGV6_FREQ_JUNGLE + blend)
 442                                 return BT_JUNGLE;
 443                         else
 444                                 return BT_DESERT;
 445                 } else if (d < MGV6_FREQ_SNOW + blend) {
 446                         if (h > MGV6_FREQ_TAIGA + blend)
 447                                 return BT_TAIGA;
 448                         else
 449                                 return BT_TUNDRA;
 450                 } else {
 451                         return BT_NORMAL;
 452                 }
 453         } else {
 454                 if (d > freq_desert)
 455                         return BT_DESERT;
 456
 457                 if ((spflags & MGV6_BIOMEBLEND) && (d > freq_desert - 0.10) &&
 458                                 ((noise2d(p.X, p.Y, seed) + 1.0) > (freq_desert - d) * 20.0))
 459                         return BT_DESERT;
 460
 461                 if ((spflags & MGV6_JUNGLES) && h > 0.75)
 462                         return BT_JUNGLE;
 463                 else
 464                         return BT_NORMAL;
 465         }
 466 }
 467
 468
 469 u32 MapgenV6::get_blockseed(u64 seed, v3s16 p)
 470 {
 471         s32 x = p.X, y = p.Y, z = p.Z;
 472         return (u32)(seed % 0x100000000ULL) + z * 38134234 + y * 42123 + x * 23;
 473 }
 474
 475
 476 //////////////////////// Map generator
 477
 478 void MapgenV6::makeChunk(BlockMakeData *data)
 479 {
 480         // Pre-conditions
 481         assert(data->vmanip);
 482         assert(data->nodedef);
 483         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 484                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 485                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 486         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 487                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 488                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 489
 490         this->generating = true;
 491         this->vm   = data->vmanip;
 492         this->ndef = data->nodedef;
 493
 494         // Hack: use minimum block coords for old code that assumes a single block
 495         v3s16 blockpos_min = data->blockpos_min;
 496         v3s16 blockpos_max = data->blockpos_max;
 497
 498         // Area of central chunk
 499         node_min = blockpos_min * MAP_BLOCKSIZE;
 500         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 501
 502         // Full allocated area
 503         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 504         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 505
 506         central_area_size = node_max - node_min + v3s16(1, 1, 1);
 507         assert(central_area_size.X == central_area_size.Z);
 508
 509         int volume_blocks = (blockpos_max.X - blockpos_min.X + 1)
 510                                           * (blockpos_max.Y - blockpos_min.Y + 1)
 511                                           * (blockpos_max.Z - blockpos_max.Z + 1);
 512
 513         volume_nodes = volume_blocks *
 514                 MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 515
 516         // Create a block-specific seed
 517         blockseed = get_blockseed(data->seed, full_node_min);
 518
 519         // Make some noise
 520         calculateNoise();
 521
 522         // Maximum height of the stone surface and obstacles.
 523         // This is used to guide the cave generation
 524         s16 stone_surface_max_y;
 525
 526         // Generate general ground level to full area
 527         stone_surface_max_y = generateGround();
 528
 529         // Create initial heightmap to limit caves
 530         updateHeightmap(node_min, node_max);
 531
 532         const s16 max_spread_amount = MAP_BLOCKSIZE;
 533         // Limit dirt flow area by 1 because mud is flown into neighbors.
 534         s16 mudflow_minpos = -max_spread_amount + 1;
 535         s16 mudflow_maxpos = central_area_size.X + max_spread_amount - 2;
 536
 537         // Loop this part, it will make stuff look older and newer nicely
 538         const u32 age_loops = 2;
 539         for (u32 i_age = 0; i_age < age_loops; i_age++) { // Aging loop
 540                 // Make caves (this code is relatively horrible)
 541                 if (flags & MG_CAVES)
 542                         generateCaves(stone_surface_max_y);
 543
 544                 // Add mud to the central chunk
 545                 addMud();
 546
 547                 // Flow mud away from steep edges
 548                 if (spflags & MGV6_MUDFLOW)
 549                         flowMud(mudflow_minpos, mudflow_maxpos);
 550
 551         }
 552
 553         // Update heightmap after mudflow
 554         updateHeightmap(node_min, node_max);
 555
 556         // Add dungeons
 557         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 558                 DungeonParams dp;
 559
 560                 dp.np_rarity  = nparams_dungeon_rarity;
 561                 dp.np_density = nparams_dungeon_density;
 562                 dp.np_wetness = nparams_dungeon_wetness;
 563                 dp.c_water    = c_water_source;
 564                 if (getBiome(0, v2s16(node_min.X, node_min.Z)) == BT_DESERT) {
 565                         dp.c_cobble = c_desert_stone;
 566                         dp.c_moss   = c_desert_stone;
 567                         dp.c_stair  = c_desert_stone;
 568
 569                         dp.diagonal_dirs = true;
 570                         dp.mossratio     = 0.0;
 571                         dp.holesize      = v3s16(2, 3, 2);
 572                         dp.roomsize      = v3s16(2, 5, 2);
 573                         dp.notifytype    = GENNOTIFY_TEMPLE;
 574                 } else {
 575                         dp.c_cobble = c_cobble;
 576                         dp.c_moss   = c_mossycobble;
 577                         dp.c_stair  = c_stair_cobble;
 578
 579                         dp.diagonal_dirs = false;
 580                         dp.mossratio     = 3.0;
 581                         dp.holesize      = v3s16(1, 2, 1);
 582                         dp.roomsize      = v3s16(0, 0, 0);
 583                         dp.notifytype    = GENNOTIFY_DUNGEON;
 584                 }
 585
 586                 DungeonGen dgen(this, &dp);
 587                 dgen.generate(blockseed, full_node_min, full_node_max);
 588         }
 589
 590         // Add top and bottom side of water to transforming_liquid queue
 591         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 592
 593         // Add surface nodes
 594         growGrass();
 595
 596         // Generate some trees, and add grass, if a jungle
 597         if ((spflags & MGV6_TREES) || (flags & MG_TREES))
 598                 placeTreesAndJungleGrass();
 599
 600         // Generate the registered decorations
 601         if (flags & MG_DECORATIONS)
 602                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 603
 604         // Generate the registered ores
 605         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 606
 607         // Calculate lighting
 608         if (flags & MG_LIGHT)
 609                 calcLighting(node_min - v3s16(1, 1, 1) * MAP_BLOCKSIZE,
 610                         node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 611                         full_node_min, full_node_max);
 612
 613         this->generating = false;
 614 }
 615
 616
 617 void MapgenV6::calculateNoise()
 618 {
 619         int x = node_min.X;
 620         int z = node_min.Z;
 621         int fx = full_node_min.X;
 622         int fz = full_node_min.Z;
 623
 624         if (!((spflags & MGV6_FLAT) || (flags & MG_FLAT))) {
 625                 noise_terrain_base->perlinMap2D_PO(x, 0.5, z, 0.5);
 626                 noise_terrain_higher->perlinMap2D_PO(x, 0.5, z, 0.5);
 627                 noise_steepness->perlinMap2D_PO(x, 0.5, z, 0.5);
 628                 noise_height_select->perlinMap2D_PO(x, 0.5, z, 0.5);
 629                 noise_mud->perlinMap2D_PO(x, 0.5, z, 0.5);
 630         }
 631
 632         noise_beach->perlinMap2D_PO(x, 0.2, z, 0.7);
 633
 634         noise_biome->perlinMap2D_PO(fx, 0.6, fz, 0.2);
 635         noise_humidity->perlinMap2D_PO(fx, 0.0, fz, 0.0);
 636         // Humidity map does not need range limiting 0 to 1,
 637         // only humidity at point does
 638 }
 639
 640
 641 int MapgenV6::generateGround()
 642 {
 643         //TimeTaker timer1("Generating ground level");
 644         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 645         MapNode n_stone(c_stone), n_desert_stone(c_desert_stone);
 646         MapNode n_ice(c_ice);
 647         int stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 648
 649         u32 index = 0;
 650         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 651         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 652                 // Surface height
 653                 s16 surface_y = (s16)baseTerrainLevelFromMap(index);
 654
 655                 // Log it
 656                 if (surface_y > stone_surface_max_y)
 657                         stone_surface_max_y = surface_y;
 658
 659                 BiomeV6Type bt = getBiome(v2s16(x, z));
 660
 661                 // Fill ground with stone
 662                 v3s16 em = vm->m_area.getExtent();
 663                 u32 i = vm->m_area.index(x, node_min.Y, z);
 664                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 665                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 666                                 if (y <= surface_y) {
 667                                         vm->m_data[i] = (y >= MGV6_DESERT_STONE_BASE
 668                                                         && bt == BT_DESERT) ?
 669                                                 n_desert_stone : n_stone;
 670                                 } else if (y <= water_level) {
 671                                         vm->m_data[i] = (y >= MGV6_ICE_BASE
 672                                                         && bt == BT_TUNDRA) ?
 673                                                 n_ice : n_water_source;
 674                                 } else {
 675                                         vm->m_data[i] = n_air;
 676                                 }
 677                         }
 678                         vm->m_area.add_y(em, i, 1);
 679                 }
 680         }
 681
 682         return stone_surface_max_y;
 683 }
 684
 685
 686 void MapgenV6::addMud()
 687 {
 688         // 15ms @cs=8
 689         //TimeTaker timer1("add mud");
 690         MapNode n_dirt(c_dirt), n_gravel(c_gravel);
 691         MapNode n_sand(c_sand), n_desert_sand(c_desert_sand);
 692         MapNode addnode;
 693
 694         u32 index = 0;
 695         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 696         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 697                 // Randomize mud amount
 698                 s16 mud_add_amount = getMudAmount(index) / 2.0 + 0.5;
 699
 700                 // Find ground level
 701                 s16 surface_y = find_stone_level(v2s16(x, z)); /////////////////optimize this!
 702
 703                 // Handle area not found
 704                 if (surface_y == vm->m_area.MinEdge.Y - 1)
 705                         continue;
 706
 707                 BiomeV6Type bt = getBiome(v2s16(x, z));
 708                 addnode = (bt == BT_DESERT) ? n_desert_sand : n_dirt;
 709
 710                 if (bt == BT_DESERT && surface_y + mud_add_amount <= water_level + 1) {
 711                         addnode = n_sand;
 712                 } else if (mud_add_amount <= 0) {
 713                         mud_add_amount = 1 - mud_add_amount;
 714                         addnode = n_gravel;
 715                 } else if (bt != BT_DESERT && getHaveBeach(index) &&
 716                                 surface_y + mud_add_amount <= water_level + 2) {
 717                         addnode = n_sand;
 718                 }
 719
 720                 if ((bt == BT_DESERT || bt == BT_TUNDRA) && surface_y > 20)
 721                         mud_add_amount = MYMAX(0, mud_add_amount - (surface_y - 20) / 5);
 722
 723                 /* If topmost node is grass, change it to mud.  It might be if it was
 724                 // flown to there from a neighboring chunk and then converted.
 725                 u32 i = vm->m_area.index(x, surface_y, z);
 726                 if (vm->m_data[i].getContent() == c_dirt_with_grass)
 727                         vm->m_data[i] = n_dirt;*/
 728
 729                 // Add mud on ground
 730                 s16 mudcount = 0;
 731                 v3s16 em = vm->m_area.getExtent();
 732                 s16 y_start = surface_y + 1;
 733                 u32 i = vm->m_area.index(x, y_start, z);
 734                 for (s16 y = y_start; y <= node_max.Y; y++) {
 735                         if (mudcount >= mud_add_amount)
 736                                 break;
 737
 738                         vm->m_data[i] = addnode;
 739                         mudcount++;
 740
 741                         vm->m_area.add_y(em, i, 1);
 742                 }
 743         }
 744 }
 745
 746
 747 void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos)
 748 {
 749         // 340ms @cs=8
 750         //TimeTaker timer1("flow mud");
 751
 752         // Iterate a few times
 753         for (s16 k = 0; k < 3; k++) {
 754                 for (s16 z = mudflow_minpos; z <= mudflow_maxpos; z++)
 755                 for (s16 x = mudflow_minpos; x <= mudflow_maxpos; x++) {
 756                         // Invert coordinates every 2nd iteration
 757                         if (k % 2 == 0) {
 758                                 x = mudflow_maxpos - (x - mudflow_minpos);
 759                                 z = mudflow_maxpos - (z - mudflow_minpos);
 760                         }
 761
 762                         // Node position in 2d
 763                         v2s16 p2d = v2s16(node_min.X, node_min.Z) + v2s16(x, z);
 764
 765                         v3s16 em = vm->m_area.getExtent();
 766                         u32 i = vm->m_area.index(p2d.X, node_max.Y, p2d.Y);
 767                         s16 y = node_max.Y;
 768
 769                         while (y >= node_min.Y) {
 770
 771                         for (;; y--) {
 772                                 MapNode *n = NULL;
 773                                 // Find mud
 774                                 for (; y >= node_min.Y; y--) {
 775                                         n = &vm->m_data[i];
 776                                         if (n->getContent() == c_dirt ||
 777                                                         n->getContent() == c_dirt_with_grass ||
 778                                                         n->getContent() == c_gravel)
 779                                                 break;
 780
 781                                         vm->m_area.add_y(em, i, -1);
 782                                 }
 783
 784                                 // Stop if out of area
 785                                 //if(vmanip.m_area.contains(i) == false)
 786                                 if (y < node_min.Y)
 787                                         break;
 788
 789                                 if (n->getContent() == c_dirt ||
 790                                                 n->getContent() == c_dirt_with_grass) {
 791                                         // Make it exactly mud
 792                                         n->setContent(c_dirt);
 793
 794                                         // Don't flow it if the stuff under it is not mud
 795                                         {
 796                                                 u32 i2 = i;
 797                                                 vm->m_area.add_y(em, i2, -1);
 798                                                 // Cancel if out of area
 799                                                 if (vm->m_area.contains(i2) == false)
 800                                                         continue;
 801                                                 MapNode *n2 = &vm->m_data[i2];
 802                                                 if (n2->getContent() != c_dirt &&
 803                                                                 n2->getContent() != c_dirt_with_grass)
 804                                                         continue;
 805                                         }
 806                                 }
 807
 808                                 v3s16 dirs4[4] = {
 809                                         v3s16(0, 0, 1), // back
 810                                         v3s16(1, 0, 0), // right
 811                                         v3s16(0, 0, -1), // front
 812                                         v3s16(-1, 0, 0), // left
 813                                 };
 814
 815                                 // Check that upper is air or doesn't exist.
 816                                 // Cancel dropping if upper keeps it in place
 817                                 u32 i3 = i;
 818                                 vm->m_area.add_y(em, i3, 1);
 819                                 if (vm->m_area.contains(i3) == true &&
 820                                                 ndef->get(vm->m_data[i3]).walkable)
 821                                         continue;
 822
 823                                 // Drop mud on side
 824                                 for (u32 di = 0; di < 4; di++) {
 825                                         v3s16 dirp = dirs4[di];
 826                                         u32 i2 = i;
 827                                         // Move to side
 828                                         vm->m_area.add_p(em, i2, dirp);
 829                                         // Fail if out of area
 830                                         if (vm->m_area.contains(i2) == false)
 831                                                 continue;
 832                                         // Check that side is air
 833                                         MapNode *n2 = &vm->m_data[i2];
 834                                         if (ndef->get(*n2).walkable)
 835                                                 continue;
 836                                         // Check that under side is air
 837                                         vm->m_area.add_y(em, i2, -1);
 838                                         if (vm->m_area.contains(i2) == false)
 839                                                 continue;
 840                                         n2 = &vm->m_data[i2];
 841                                         if (ndef->get(*n2).walkable)
 842                                                 continue;
 843                                         // Loop further down until not air
 844                                         bool dropped_to_unknown = false;
 845                                         do {
 846                                                 vm->m_area.add_y(em, i2, -1);
 847                                                 n2 = &vm->m_data[i2];
 848                                                 // if out of known area
 849                                                 if (vm->m_area.contains(i2) == false ||
 850                                                                 n2->getContent() == CONTENT_IGNORE) {
 851                                                         dropped_to_unknown = true;
 852                                                         break;
 853                                                 }
 854                                         } while (ndef->get(*n2).walkable == false);
 855                                         // Loop one up so that we're in air
 856                                         vm->m_area.add_y(em, i2, 1);
 857                                         n2 = &vm->m_data[i2];
 858
 859                                         bool old_is_water = (n->getContent() == c_water_source);
 860                                         // Move mud to new place
 861                                         if (!dropped_to_unknown) {
 862                                                 *n2 = *n;
 863                                                 // Set old place to be air (or water)
 864                                                 if (old_is_water)
 865                                                         *n = MapNode(c_water_source);
 866                                                 else
 867                                                         *n = MapNode(CONTENT_AIR);
 868                                         }
 869
 870                                         // Done
 871                                         break;
 872                                 }
 873                         }
 874                         }
 875                 }
 876         }
 877 }
 878
 879
 880 void MapgenV6::placeTreesAndJungleGrass()
 881 {
 882         //TimeTaker t("placeTrees");
 883         if (node_max.Y < water_level)
 884                 return;
 885
 886         PseudoRandom grassrandom(blockseed + 53);
 887         content_t c_junglegrass = ndef->getId("mapgen_junglegrass");
 888         // if we don't have junglegrass, don't place cignore... that's bad
 889         if (c_junglegrass == CONTENT_IGNORE)
 890                 c_junglegrass = CONTENT_AIR;
 891         MapNode n_junglegrass(c_junglegrass);
 892         v3s16 em = vm->m_area.getExtent();
 893
 894         // Divide area into parts
 895         s16 div = 8;
 896         s16 sidelen = central_area_size.X / div;
 897         double area = sidelen * sidelen;
 898
 899         // N.B.  We must add jungle grass first, since tree leaves will
 900         // obstruct the ground, giving us a false ground level
 901         for (s16 z0 = 0; z0 < div; z0++)
 902         for (s16 x0 = 0; x0 < div; x0++) {
 903                 // Center position of part of division
 904                 v2s16 p2d_center(
 905                         node_min.X + sidelen / 2 + sidelen * x0,
 906                         node_min.Z + sidelen / 2 + sidelen * z0
 907                 );
 908                 // Minimum edge of part of division
 909                 v2s16 p2d_min(
 910                         node_min.X + sidelen * x0,
 911                         node_min.Z + sidelen * z0
 912                 );
 913                 // Maximum edge of part of division
 914                 v2s16 p2d_max(
 915                         node_min.X + sidelen + sidelen * x0 - 1,
 916                         node_min.Z + sidelen + sidelen * z0 - 1
 917                 );
 918
 919                 // Get biome at center position of part of division
 920                 BiomeV6Type bt = getBiome(p2d_center);
 921
 922                 // Amount of trees
 923                 u32 tree_count;
 924                 if (bt == BT_JUNGLE || bt == BT_TAIGA || bt == BT_NORMAL) {
 925                         tree_count = area * getTreeAmount(p2d_center);
 926                         if (bt == BT_JUNGLE)
 927                                 tree_count *= 4;
 928                 } else {
 929                         tree_count = 0;
 930                 }
 931
 932                 // Add jungle grass
 933                 if (bt == BT_JUNGLE) {
 934                         float humidity = getHumidity(p2d_center);
 935                         u32 grass_count = 5 * humidity * tree_count;
 936                         for (u32 i = 0; i < grass_count; i++) {
 937                                 s16 x = grassrandom.range(p2d_min.X, p2d_max.X);
 938                                 s16 z = grassrandom.range(p2d_min.Y, p2d_max.Y);
 939                                 int mapindex = central_area_size.X * (z - node_min.Z)
 940                                                                 + (x - node_min.X);
 941                                 s16 y = heightmap[mapindex];
 942                                 if (y < water_level)
 943                                         continue;
 944
 945                                 u32 vi = vm->m_area.index(x, y, z);
 946                                 // place on dirt_with_grass, since we know it is exposed to sunlight
 947                                 if (vm->m_data[vi].getContent() == c_dirt_with_grass) {
 948                                         vm->m_area.add_y(em, vi, 1);
 949                                         vm->m_data[vi] = n_junglegrass;
 950                                 }
 951                         }
 952                 }
 953
 954                 // Put trees in random places on part of division
 955                 for (u32 i = 0; i < tree_count; i++) {
 956                         s16 x = myrand_range(p2d_min.X, p2d_max.X);
 957                         s16 z = myrand_range(p2d_min.Y, p2d_max.Y);
 958                         int mapindex = central_area_size.X * (z - node_min.Z)
 959                                                         + (x - node_min.X);
 960                         s16 y = heightmap[mapindex];
 961                         // Don't make a tree under water level
 962                         // Don't make a tree so high that it doesn't fit
 963                         if (y < water_level || y > node_max.Y - 6)
 964                                 continue;
 965
 966                         v3s16 p(x, y, z);
 967                         // Trees grow only on mud and grass and snowblock
 968                         {
 969                                 u32 i = vm->m_area.index(p);
 970                                 content_t c = vm->m_data[i].getContent();
 971                                 if (c != c_dirt &&
 972                                                 c != c_dirt_with_grass &&
 973                                                 c != c_dirt_with_snow &&
 974                                                 c != c_snowblock)
 975                                         continue;
 976                         }
 977                         p.Y++;
 978
 979                         // Make a tree
 980                         if (bt == BT_JUNGLE) {
 981                                 treegen::make_jungletree(*vm, p, ndef, myrand());
 982                         } else if (bt == BT_TAIGA) {
 983                                 treegen::make_pine_tree(*vm, p - v3s16(0, 1, 0), ndef, myrand());
 984                         } else if (bt == BT_NORMAL) {
 985                                 bool is_apple_tree = (myrand_range(0, 3) == 0) &&
 986                                                         getHaveAppleTree(v2s16(x, z));
 987                                 treegen::make_tree(*vm, p, is_apple_tree, ndef, myrand());
 988                         }
 989                 }
 990         }
 991         //printf("placeTreesAndJungleGrass: %dms\n", t.stop());
 992 }
 993
 994
 995 void MapgenV6::growGrass() // Add surface nodes
 996 {
 997         MapNode n_dirt_with_grass(c_dirt_with_grass);
 998         MapNode n_dirt_with_snow(c_dirt_with_snow);
 999         MapNode n_snowblock(c_snowblock);
1000         MapNode n_snow(c_snow);
1001         v3s16 em = vm->m_area.getExtent();
1002
1003         u32 index = 0;
1004         for (s16 z = full_node_min.Z; z <= full_node_max.Z; z++)
1005         for (s16 x = full_node_min.X; x <= full_node_max.X; x++, index++) {
1006                 // Find the lowest surface to which enough light ends up to make
1007                 // grass grow.  Basically just wait until not air and not leaves.
1008                 s16 surface_y = 0;
1009                 {
1010                         u32 i = vm->m_area.index(x, node_max.Y, z);
1011                         s16 y;
1012                         // Go to ground level
1013                         for (y = node_max.Y; y >= full_node_min.Y; y--) {
1014                                 MapNode &n = vm->m_data[i];
1015                                 if (ndef->get(n).param_type != CPT_LIGHT ||
1016                                                 ndef->get(n).liquid_type != LIQUID_NONE ||
1017                                                 n.getContent() == c_ice)
1018                                         break;
1019                                 vm->m_area.add_y(em, i, -1);
1020                         }
1021                         surface_y = (y >= full_node_min.Y) ? y : full_node_min.Y;
1022                 }
1023
1024                 BiomeV6Type bt = getBiome(index, v2s16(x, z));
1025                 u32 i = vm->m_area.index(x, surface_y, z);
1026                 content_t c = vm->m_data[i].getContent();
1027                 if (surface_y >= water_level - 20) {
1028                         if (bt == BT_TAIGA && c == c_dirt) {
1029                                 vm->m_data[i] = n_snowblock;
1030                                 vm->m_area.add_y(em, i, -1);
1031                                 vm->m_data[i] = n_dirt_with_snow;
1032                         } else if (bt == BT_TUNDRA) {
1033                                 if (c == c_dirt) {
1034                                         vm->m_data[i] = n_dirt_with_snow;
1035                                 } else if (c == c_stone && surface_y < node_max.Y) {
1036                                         vm->m_area.add_y(em, i, 1);
1037                                         vm->m_data[i] = n_snow;
1038                                 }
1039                         } else if (c == c_dirt) {
1040                                 vm->m_data[i] = n_dirt_with_grass;
1041                         }
1042                 }
1043         }
1044 }
1045
1046
1047 void MapgenV6::generateCaves(int max_stone_y)
1048 {
1049         float cave_amount = NoisePerlin2D(np_cave, node_min.X, node_min.Y, seed);
1050         int volume_nodes = (node_max.X - node_min.X + 1) *
1051                                            (node_max.Y - node_min.Y + 1) * MAP_BLOCKSIZE;
1052         cave_amount = MYMAX(0.0, cave_amount);
1053         u32 caves_count = cave_amount * volume_nodes / 50000;
1054         u32 bruises_count = 1;
1055         PseudoRandom ps(blockseed + 21343);
1056         PseudoRandom ps2(blockseed + 1032);
1057
1058         if (ps.range(1, 6) == 1)
1059                 bruises_count = ps.range(0, ps.range(0, 2));
1060
1061         if (getBiome(v2s16(node_min.X, node_min.Z)) == BT_DESERT) {
1062                 caves_count   /= 3;
1063                 bruises_count /= 3;
1064         }
1065
1066         for (u32 i = 0; i < caves_count + bruises_count; i++) {
1067                 bool large_cave = (i >= caves_count);
1068                 CaveV6 cave(this, &ps, &ps2, large_cave);
1069
1070                 cave.makeCave(node_min, node_max, max_stone_y);
1071         }
1072 }