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_JUNGLES | MGV6_SNOWBIOMES | MGV6_TREES |
 144                 MGV6_BIOMEBLEND | MGV6_MUDFLOW;
 145
 146         freq_desert = 0.45;
 147         freq_beach  = 0.15;
 148
 149         np_terrain_base   = NoiseParams(-4,   20.0, v3f(250.0, 250.0, 250.0), 82341,  5, 0.6,  2.0);
 150         np_terrain_higher = NoiseParams(20,   16.0, v3f(500.0, 500.0, 500.0), 85039,  5, 0.6,  2.0);
 151         np_steepness      = NoiseParams(0.85, 0.5,  v3f(125.0, 125.0, 125.0), -932,   5, 0.7,  2.0);
 152         np_height_select  = NoiseParams(0,    1.0,  v3f(250.0, 250.0, 250.0), 4213,   5, 0.69, 2.0);
 153         np_mud            = NoiseParams(4,    2.0,  v3f(200.0, 200.0, 200.0), 91013,  3, 0.55, 2.0);
 154         np_beach          = NoiseParams(0,    1.0,  v3f(250.0, 250.0, 250.0), 59420,  3, 0.50, 2.0);
 155         np_biome          = NoiseParams(0,    1.0,  v3f(500.0, 500.0, 500.0), 9130,   3, 0.50, 2.0);
 156         np_cave           = NoiseParams(6,    6.0,  v3f(250.0, 250.0, 250.0), 34329,  3, 0.50, 2.0);
 157         np_humidity       = NoiseParams(0.5,  0.5,  v3f(500.0, 500.0, 500.0), 72384,  3, 0.50, 2.0);
 158         np_trees          = NoiseParams(0,    1.0,  v3f(125.0, 125.0, 125.0), 2,      4, 0.66, 2.0);
 159         np_apple_trees    = NoiseParams(0,    1.0,  v3f(100.0, 100.0, 100.0), 342902, 3, 0.45, 2.0);
 160 }
 161
 162
 163 void MapgenV6Params::readParams(const Settings *settings)
 164 {
 165         settings->getFlagStrNoEx("mgv6_spflags", spflags, flagdesc_mapgen_v6);
 166         settings->getFloatNoEx("mgv6_freq_desert", freq_desert);
 167         settings->getFloatNoEx("mgv6_freq_beach",  freq_beach);
 168
 169         settings->getNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 170         settings->getNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 171         settings->getNoiseParams("mgv6_np_steepness",      np_steepness);
 172         settings->getNoiseParams("mgv6_np_height_select",  np_height_select);
 173         settings->getNoiseParams("mgv6_np_mud",            np_mud);
 174         settings->getNoiseParams("mgv6_np_beach",          np_beach);
 175         settings->getNoiseParams("mgv6_np_biome",          np_biome);
 176         settings->getNoiseParams("mgv6_np_cave",           np_cave);
 177         settings->getNoiseParams("mgv6_np_humidity",       np_humidity);
 178         settings->getNoiseParams("mgv6_np_trees",          np_trees);
 179         settings->getNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 180 }
 181
 182
 183 void MapgenV6Params::writeParams(Settings *settings) const
 184 {
 185         settings->setFlagStr("mgv6_spflags", spflags, flagdesc_mapgen_v6, U32_MAX);
 186         settings->setFloat("mgv6_freq_desert", freq_desert);
 187         settings->setFloat("mgv6_freq_beach",  freq_beach);
 188
 189         settings->setNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 190         settings->setNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 191         settings->setNoiseParams("mgv6_np_steepness",      np_steepness);
 192         settings->setNoiseParams("mgv6_np_height_select",  np_height_select);
 193         settings->setNoiseParams("mgv6_np_mud",            np_mud);
 194         settings->setNoiseParams("mgv6_np_beach",          np_beach);
 195         settings->setNoiseParams("mgv6_np_biome",          np_biome);
 196         settings->setNoiseParams("mgv6_np_cave",           np_cave);
 197         settings->setNoiseParams("mgv6_np_humidity",       np_humidity);
 198         settings->setNoiseParams("mgv6_np_trees",          np_trees);
 199         settings->setNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 200 }
 201
 202
 203 //////////////////////// Some helper functions for the map generator
 204
 205 // Returns Y one under area minimum if not found
 206 s16 MapgenV6::find_stone_level(v2s16 p2d)
 207 {
 208         v3s16 em = vm->m_area.getExtent();
 209         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 210         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 211         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 212         s16 y;
 213
 214         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 215                 content_t c = vm->m_data[i].getContent();
 216                 if (c != CONTENT_IGNORE && (c == c_stone || c == c_desert_stone))
 217                         break;
 218
 219                 vm->m_area.add_y(em, i, -1);
 220         }
 221         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 222 }
 223
 224
 225 // Required by mapgen.h
 226 bool MapgenV6::block_is_underground(u64 seed, v3s16 blockpos)
 227 {
 228         /*s16 minimum_groundlevel = (s16)get_sector_minimum_ground_level(
 229                         seed, v2s16(blockpos.X, blockpos.Z));*/
 230         // Nah, this is just a heuristic, just return something
 231         s16 minimum_groundlevel = water_level;
 232
 233         if(blockpos.Y * MAP_BLOCKSIZE + MAP_BLOCKSIZE <= minimum_groundlevel)
 234                 return true;
 235         else
 236                 return false;
 237 }
 238
 239
 240 //////////////////////// Base terrain height functions
 241
 242 float MapgenV6::baseTerrainLevel(float terrain_base, float terrain_higher,
 243         float steepness, float height_select)
 244 {
 245         float base   = 1 + terrain_base;
 246         float higher = 1 + terrain_higher;
 247
 248         // Limit higher ground level to at least base
 249         if(higher < base)
 250                 higher = base;
 251
 252         // Steepness factor of cliffs
 253         float b = steepness;
 254         b = rangelim(b, 0.0, 1000.0);
 255         b = 5 * b * b * b * b * b * b * b;
 256         b = rangelim(b, 0.5, 1000.0);
 257
 258         // Values 1.5...100 give quite horrible looking slopes
 259         if (b > 1.5 && b < 100.0)
 260                 b = (b < 10.0) ? 1.5 : 100.0;
 261
 262         float a_off = -0.20; // Offset to more low
 263         float a = 0.5 + b * (a_off + height_select);
 264         a = rangelim(a, 0.0, 1.0); // Limit
 265
 266         return base * (1.0 - a) + higher * a;
 267 }
 268
 269
 270 float MapgenV6::baseTerrainLevelFromNoise(v2s16 p)
 271 {
 272         if ((spflags & MGV6_FLAT) || (flags & MG_FLAT))
 273                 return water_level;
 274
 275         float terrain_base   = NoisePerlin2D_PO(&noise_terrain_base->np,
 276                                                         p.X, 0.5, p.Y, 0.5, seed);
 277         float terrain_higher = NoisePerlin2D_PO(&noise_terrain_higher->np,
 278                                                         p.X, 0.5, p.Y, 0.5, seed);
 279         float steepness      = NoisePerlin2D_PO(&noise_steepness->np,
 280                                                         p.X, 0.5, p.Y, 0.5, seed);
 281         float height_select  = NoisePerlin2D_PO(&noise_height_select->np,
 282                                                         p.X, 0.5, p.Y, 0.5, seed);
 283
 284         return baseTerrainLevel(terrain_base, terrain_higher,
 285                                                         steepness, height_select);
 286 }
 287
 288
 289 float MapgenV6::baseTerrainLevelFromMap(v2s16 p)
 290 {
 291         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 292         return baseTerrainLevelFromMap(index);
 293 }
 294
 295
 296 float MapgenV6::baseTerrainLevelFromMap(int index)
 297 {
 298         if ((spflags & MGV6_FLAT) || (flags & MG_FLAT))
 299                 return water_level;
 300
 301         float terrain_base   = noise_terrain_base->result[index];
 302         float terrain_higher = noise_terrain_higher->result[index];
 303         float steepness      = noise_steepness->result[index];
 304         float height_select  = noise_height_select->result[index];
 305
 306         return baseTerrainLevel(terrain_base, terrain_higher,
 307                                                         steepness, height_select);
 308 }
 309
 310
 311 s16 MapgenV6::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision)
 312 {
 313         return baseTerrainLevelFromNoise(p2d) + MGV6_AVERAGE_MUD_AMOUNT;
 314 }
 315
 316
 317 int MapgenV6::getGroundLevelAtPoint(v2s16 p)
 318 {
 319         return baseTerrainLevelFromNoise(p) + MGV6_AVERAGE_MUD_AMOUNT;
 320 }
 321
 322
 323 int MapgenV6::getSpawnLevelAtPoint(v2s16 p)
 324 {
 325         s16 level_at_point = baseTerrainLevelFromNoise(p) + MGV6_AVERAGE_MUD_AMOUNT;
 326         if (level_at_point <= water_level ||
 327                         level_at_point > water_level + 16)
 328                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 329         else
 330                 return level_at_point;
 331 }
 332
 333
 334 //////////////////////// Noise functions
 335
 336 float MapgenV6::getMudAmount(v2s16 p)
 337 {
 338         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 339         return getMudAmount(index);
 340 }
 341
 342
 343 bool MapgenV6::getHaveBeach(v2s16 p)
 344 {
 345         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 346         return getHaveBeach(index);
 347 }
 348
 349
 350 BiomeV6Type MapgenV6::getBiome(v2s16 p)
 351 {
 352         int index = (p.Y - full_node_min.Z) * (ystride + 2 * MAP_BLOCKSIZE)
 353                         + (p.X - full_node_min.X);
 354         return getBiome(index, p);
 355 }
 356
 357
 358 float MapgenV6::getHumidity(v2s16 p)
 359 {
 360         /*double noise = noise2d_perlin(
 361                 0.5+(float)p.X/500, 0.5+(float)p.Y/500,
 362                 seed+72384, 4, 0.66);
 363         noise = (noise + 1.0)/2.0;*/
 364
 365         int index = (p.Y - full_node_min.Z) * (ystride + 2 * MAP_BLOCKSIZE)
 366                         + (p.X - full_node_min.X);
 367         float noise = noise_humidity->result[index];
 368
 369         if (noise < 0.0)
 370                 noise = 0.0;
 371         if (noise > 1.0)
 372                 noise = 1.0;
 373         return noise;
 374 }
 375
 376
 377 float MapgenV6::getTreeAmount(v2s16 p)
 378 {
 379         /*double noise = noise2d_perlin(
 380                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 381                         seed+2, 4, 0.66);*/
 382
 383         float noise = NoisePerlin2D(np_trees, p.X, p.Y, seed);
 384         float zeroval = -0.39;
 385         if (noise < zeroval)
 386                 return 0;
 387         else
 388                 return 0.04 * (noise - zeroval) / (1.0 - zeroval);
 389 }
 390
 391
 392 bool MapgenV6::getHaveAppleTree(v2s16 p)
 393 {
 394         /*is_apple_tree = noise2d_perlin(
 395                 0.5+(float)p.X/100, 0.5+(float)p.Z/100,
 396                 data->seed+342902, 3, 0.45) > 0.2;*/
 397
 398         float noise = NoisePerlin2D(np_apple_trees, p.X, p.Y, seed);
 399
 400         return noise > 0.2;
 401 }
 402
 403
 404 float MapgenV6::getMudAmount(int index)
 405 {
 406         if ((spflags & MGV6_FLAT) || (flags & MG_FLAT))
 407                 return MGV6_AVERAGE_MUD_AMOUNT;
 408
 409         /*return ((float)AVERAGE_MUD_AMOUNT + 2.0 * noise2d_perlin(
 410                         0.5+(float)p.X/200, 0.5+(float)p.Y/200,
 411                         seed+91013, 3, 0.55));*/
 412
 413         return noise_mud->result[index];
 414 }
 415
 416
 417 bool MapgenV6::getHaveBeach(int index)
 418 {
 419         // Determine whether to have sand here
 420         /*double sandnoise = noise2d_perlin(
 421                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 422                         seed+59420, 3, 0.50);*/
 423
 424         float sandnoise = noise_beach->result[index];
 425         return (sandnoise > freq_beach);
 426 }
 427
 428
 429 BiomeV6Type MapgenV6::getBiome(int index, v2s16 p)
 430 {
 431         // Just do something very simple as for now
 432         /*double d = noise2d_perlin(
 433                         0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
 434                         seed+9130, 3, 0.50);*/
 435
 436         float d = noise_biome->result[index];
 437         float h = noise_humidity->result[index];
 438
 439         if (spflags & MGV6_SNOWBIOMES) {
 440                 float blend = (spflags & MGV6_BIOMEBLEND) ? noise2d(p.X, p.Y, seed) / 40 : 0;
 441
 442                 if (d > MGV6_FREQ_HOT + blend) {
 443                         if (h > MGV6_FREQ_JUNGLE + blend)
 444                                 return BT_JUNGLE;
 445                         else
 446                                 return BT_DESERT;
 447                 } else if (d < MGV6_FREQ_SNOW + blend) {
 448                         if (h > MGV6_FREQ_TAIGA + blend)
 449                                 return BT_TAIGA;
 450                         else
 451                                 return BT_TUNDRA;
 452                 } else {
 453                         return BT_NORMAL;
 454                 }
 455         } else {
 456                 if (d > freq_desert)
 457                         return BT_DESERT;
 458
 459                 if ((spflags & MGV6_BIOMEBLEND) && (d > freq_desert - 0.10) &&
 460                                 ((noise2d(p.X, p.Y, seed) + 1.0) > (freq_desert - d) * 20.0))
 461                         return BT_DESERT;
 462
 463                 if ((spflags & MGV6_JUNGLES) && h > 0.75)
 464                         return BT_JUNGLE;
 465                 else
 466                         return BT_NORMAL;
 467         }
 468 }
 469
 470
 471 u32 MapgenV6::get_blockseed(u64 seed, v3s16 p)
 472 {
 473         s32 x = p.X, y = p.Y, z = p.Z;
 474         return (u32)(seed % 0x100000000ULL) + z * 38134234 + y * 42123 + x * 23;
 475 }
 476
 477
 478 //////////////////////// Map generator
 479
 480 void MapgenV6::makeChunk(BlockMakeData *data)
 481 {
 482         // Pre-conditions
 483         assert(data->vmanip);
 484         assert(data->nodedef);
 485         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 486                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 487                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 488         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 489                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 490                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 491
 492         this->generating = true;
 493         this->vm   = data->vmanip;
 494         this->ndef = data->nodedef;
 495
 496         // Hack: use minimum block coords for old code that assumes a single block
 497         v3s16 blockpos_min = data->blockpos_min;
 498         v3s16 blockpos_max = data->blockpos_max;
 499
 500         // Area of central chunk
 501         node_min = blockpos_min * MAP_BLOCKSIZE;
 502         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 503
 504         // Full allocated area
 505         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 506         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 507
 508         central_area_size = node_max - node_min + v3s16(1, 1, 1);
 509         assert(central_area_size.X == central_area_size.Z);
 510
 511         int volume_blocks = (blockpos_max.X - blockpos_min.X + 1)
 512                                           * (blockpos_max.Y - blockpos_min.Y + 1)
 513                                           * (blockpos_max.Z - blockpos_max.Z + 1);
 514
 515         volume_nodes = volume_blocks *
 516                 MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 517
 518         // Create a block-specific seed
 519         blockseed = get_blockseed(data->seed, full_node_min);
 520
 521         // Make some noise
 522         calculateNoise();
 523
 524         // Maximum height of the stone surface and obstacles.
 525         // This is used to guide the cave generation
 526         s16 stone_surface_max_y;
 527
 528         // Generate general ground level to full area
 529         stone_surface_max_y = generateGround();
 530
 531         // Create initial heightmap to limit caves
 532         updateHeightmap(node_min, node_max);
 533
 534         const s16 max_spread_amount = MAP_BLOCKSIZE;
 535         // Limit dirt flow area by 1 because mud is flown into neighbors.
 536         s16 mudflow_minpos = -max_spread_amount + 1;
 537         s16 mudflow_maxpos = central_area_size.X + max_spread_amount - 2;
 538
 539         // Loop this part, it will make stuff look older and newer nicely
 540         const u32 age_loops = 2;
 541         for (u32 i_age = 0; i_age < age_loops; i_age++) { // Aging loop
 542                 // Make caves (this code is relatively horrible)
 543                 if (flags & MG_CAVES)
 544                         generateCaves(stone_surface_max_y);
 545
 546                 // Add mud to the central chunk
 547                 addMud();
 548
 549                 // Flow mud away from steep edges
 550                 if (spflags & MGV6_MUDFLOW)
 551                         flowMud(mudflow_minpos, mudflow_maxpos);
 552
 553         }
 554
 555         // Update heightmap after mudflow
 556         updateHeightmap(node_min, node_max);
 557
 558         // Add dungeons
 559         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 560                 DungeonParams dp;
 561
 562                 dp.np_rarity  = nparams_dungeon_rarity;
 563                 dp.np_density = nparams_dungeon_density;
 564                 dp.np_wetness = nparams_dungeon_wetness;
 565                 dp.c_water    = c_water_source;
 566                 if (getBiome(0, v2s16(node_min.X, node_min.Z)) == BT_DESERT) {
 567                         dp.c_cobble = c_desert_stone;
 568                         dp.c_moss   = c_desert_stone;
 569                         dp.c_stair  = c_desert_stone;
 570
 571                         dp.diagonal_dirs = true;
 572                         dp.mossratio     = 0.0;
 573                         dp.holesize      = v3s16(2, 3, 2);
 574                         dp.roomsize      = v3s16(2, 5, 2);
 575                         dp.notifytype    = GENNOTIFY_TEMPLE;
 576                 } else {
 577                         dp.c_cobble = c_cobble;
 578                         dp.c_moss   = c_mossycobble;
 579                         dp.c_stair  = c_stair_cobble;
 580
 581                         dp.diagonal_dirs = false;
 582                         dp.mossratio     = 3.0;
 583                         dp.holesize      = v3s16(1, 2, 1);
 584                         dp.roomsize      = v3s16(0, 0, 0);
 585                         dp.notifytype    = GENNOTIFY_DUNGEON;
 586                 }
 587
 588                 DungeonGen dgen(this, &dp);
 589                 dgen.generate(blockseed, full_node_min, full_node_max);
 590         }
 591
 592         // Add top and bottom side of water to transforming_liquid queue
 593         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 594
 595         // Add surface nodes
 596         growGrass();
 597
 598         // Generate some trees, and add grass, if a jungle
 599         if ((spflags & MGV6_TREES) || (flags & MG_TREES))
 600                 placeTreesAndJungleGrass();
 601
 602         // Generate the registered decorations
 603         if (flags & MG_DECORATIONS)
 604                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 605
 606         // Generate the registered ores
 607         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 608
 609         // Calculate lighting
 610         if (flags & MG_LIGHT)
 611                 calcLighting(node_min - v3s16(1, 1, 1) * MAP_BLOCKSIZE,
 612                         node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 613                         full_node_min, full_node_max);
 614
 615         this->generating = false;
 616 }
 617
 618
 619 void MapgenV6::calculateNoise()
 620 {
 621         int x = node_min.X;
 622         int z = node_min.Z;
 623         int fx = full_node_min.X;
 624         int fz = full_node_min.Z;
 625
 626         if (!((spflags & MGV6_FLAT) || (flags & MG_FLAT))) {
 627                 noise_terrain_base->perlinMap2D_PO(x, 0.5, z, 0.5);
 628                 noise_terrain_higher->perlinMap2D_PO(x, 0.5, z, 0.5);
 629                 noise_steepness->perlinMap2D_PO(x, 0.5, z, 0.5);
 630                 noise_height_select->perlinMap2D_PO(x, 0.5, z, 0.5);
 631                 noise_mud->perlinMap2D_PO(x, 0.5, z, 0.5);
 632         }
 633
 634         noise_beach->perlinMap2D_PO(x, 0.2, z, 0.7);
 635
 636         noise_biome->perlinMap2D_PO(fx, 0.6, fz, 0.2);
 637         noise_humidity->perlinMap2D_PO(fx, 0.0, fz, 0.0);
 638         // Humidity map does not need range limiting 0 to 1,
 639         // only humidity at point does
 640 }
 641
 642
 643 int MapgenV6::generateGround()
 644 {
 645         //TimeTaker timer1("Generating ground level");
 646         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 647         MapNode n_stone(c_stone), n_desert_stone(c_desert_stone);
 648         MapNode n_ice(c_ice);
 649         int stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 650
 651         u32 index = 0;
 652         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 653         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 654                 // Surface height
 655                 s16 surface_y = (s16)baseTerrainLevelFromMap(index);
 656
 657                 // Log it
 658                 if (surface_y > stone_surface_max_y)
 659                         stone_surface_max_y = surface_y;
 660
 661                 BiomeV6Type bt = getBiome(v2s16(x, z));
 662
 663                 // Fill ground with stone
 664                 v3s16 em = vm->m_area.getExtent();
 665                 u32 i = vm->m_area.index(x, node_min.Y, z);
 666                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 667                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 668                                 if (y <= surface_y) {
 669                                         vm->m_data[i] = (y >= MGV6_DESERT_STONE_BASE
 670                                                         && bt == BT_DESERT) ?
 671                                                 n_desert_stone : n_stone;
 672                                 } else if (y <= water_level) {
 673                                         vm->m_data[i] = (y >= MGV6_ICE_BASE
 674                                                         && bt == BT_TUNDRA) ?
 675                                                 n_ice : n_water_source;
 676                                 } else {
 677                                         vm->m_data[i] = n_air;
 678                                 }
 679                         }
 680                         vm->m_area.add_y(em, i, 1);
 681                 }
 682         }
 683
 684         return stone_surface_max_y;
 685 }
 686
 687
 688 void MapgenV6::addMud()
 689 {
 690         // 15ms @cs=8
 691         //TimeTaker timer1("add mud");
 692         MapNode n_dirt(c_dirt), n_gravel(c_gravel);
 693         MapNode n_sand(c_sand), n_desert_sand(c_desert_sand);
 694         MapNode addnode;
 695
 696         u32 index = 0;
 697         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 698         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 699                 // Randomize mud amount
 700                 s16 mud_add_amount = getMudAmount(index) / 2.0 + 0.5;
 701
 702                 // Find ground level
 703                 s16 surface_y = find_stone_level(v2s16(x, z)); /////////////////optimize this!
 704
 705                 // Handle area not found
 706                 if (surface_y == vm->m_area.MinEdge.Y - 1)
 707                         continue;
 708
 709                 BiomeV6Type bt = getBiome(v2s16(x, z));
 710                 addnode = (bt == BT_DESERT) ? n_desert_sand : n_dirt;
 711
 712                 if (bt == BT_DESERT && surface_y + mud_add_amount <= water_level + 1) {
 713                         addnode = n_sand;
 714                 } else if (mud_add_amount <= 0) {
 715                         mud_add_amount = 1 - mud_add_amount;
 716                         addnode = n_gravel;
 717                 } else if (bt != BT_DESERT && getHaveBeach(index) &&
 718                                 surface_y + mud_add_amount <= water_level + 2) {
 719                         addnode = n_sand;
 720                 }
 721
 722                 if ((bt == BT_DESERT || bt == BT_TUNDRA) && surface_y > 20)
 723                         mud_add_amount = MYMAX(0, mud_add_amount - (surface_y - 20) / 5);
 724
 725                 /* If topmost node is grass, change it to mud.  It might be if it was
 726                 // flown to there from a neighboring chunk and then converted.
 727                 u32 i = vm->m_area.index(x, surface_y, z);
 728                 if (vm->m_data[i].getContent() == c_dirt_with_grass)
 729                         vm->m_data[i] = n_dirt;*/
 730
 731                 // Add mud on ground
 732                 s16 mudcount = 0;
 733                 v3s16 em = vm->m_area.getExtent();
 734                 s16 y_start = surface_y + 1;
 735                 u32 i = vm->m_area.index(x, y_start, z);
 736                 for (s16 y = y_start; y <= node_max.Y; y++) {
 737                         if (mudcount >= mud_add_amount)
 738                                 break;
 739
 740                         vm->m_data[i] = addnode;
 741                         mudcount++;
 742
 743                         vm->m_area.add_y(em, i, 1);
 744                 }
 745         }
 746 }
 747
 748
 749 void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos)
 750 {
 751         // 340ms @cs=8
 752         //TimeTaker timer1("flow mud");
 753
 754         // Iterate a few times
 755         for (s16 k = 0; k < 3; k++) {
 756                 for (s16 z = mudflow_minpos; z <= mudflow_maxpos; z++)
 757                 for (s16 x = mudflow_minpos; x <= mudflow_maxpos; x++) {
 758                         // Invert coordinates every 2nd iteration
 759                         if (k % 2 == 0) {
 760                                 x = mudflow_maxpos - (x - mudflow_minpos);
 761                                 z = mudflow_maxpos - (z - mudflow_minpos);
 762                         }
 763
 764                         // Node position in 2d
 765                         v2s16 p2d = v2s16(node_min.X, node_min.Z) + v2s16(x, z);
 766
 767                         v3s16 em = vm->m_area.getExtent();
 768                         u32 i = vm->m_area.index(p2d.X, node_max.Y, p2d.Y);
 769                         s16 y = node_max.Y;
 770
 771                         while (y >= node_min.Y) {
 772
 773                         for (;; y--) {
 774                                 MapNode *n = NULL;
 775                                 // Find mud
 776                                 for (; y >= node_min.Y; y--) {
 777                                         n = &vm->m_data[i];
 778                                         if (n->getContent() == c_dirt ||
 779                                                         n->getContent() == c_dirt_with_grass ||
 780                                                         n->getContent() == c_gravel)
 781                                                 break;
 782
 783                                         vm->m_area.add_y(em, i, -1);
 784                                 }
 785
 786                                 // Stop if out of area
 787                                 //if(vmanip.m_area.contains(i) == false)
 788                                 if (y < node_min.Y)
 789                                         break;
 790
 791                                 if (n->getContent() == c_dirt ||
 792                                                 n->getContent() == c_dirt_with_grass) {
 793                                         // Make it exactly mud
 794                                         n->setContent(c_dirt);
 795
 796                                         // Don't flow it if the stuff under it is not mud
 797                                         {
 798                                                 u32 i2 = i;
 799                                                 vm->m_area.add_y(em, i2, -1);
 800                                                 // Cancel if out of area
 801                                                 if (vm->m_area.contains(i2) == false)
 802                                                         continue;
 803                                                 MapNode *n2 = &vm->m_data[i2];
 804                                                 if (n2->getContent() != c_dirt &&
 805                                                                 n2->getContent() != c_dirt_with_grass)
 806                                                         continue;
 807                                         }
 808                                 }
 809
 810                                 v3s16 dirs4[4] = {
 811                                         v3s16(0, 0, 1), // back
 812                                         v3s16(1, 0, 0), // right
 813                                         v3s16(0, 0, -1), // front
 814                                         v3s16(-1, 0, 0), // left
 815                                 };
 816
 817                                 // Check that upper is air or doesn't exist.
 818                                 // Cancel dropping if upper keeps it in place
 819                                 u32 i3 = i;
 820                                 vm->m_area.add_y(em, i3, 1);
 821                                 if (vm->m_area.contains(i3) == true &&
 822                                                 ndef->get(vm->m_data[i3]).walkable)
 823                                         continue;
 824
 825                                 // Drop mud on side
 826                                 for (u32 di = 0; di < 4; di++) {
 827                                         v3s16 dirp = dirs4[di];
 828                                         u32 i2 = i;
 829                                         // Move to side
 830                                         vm->m_area.add_p(em, i2, dirp);
 831                                         // Fail if out of area
 832                                         if (vm->m_area.contains(i2) == false)
 833                                                 continue;
 834                                         // Check that side is air
 835                                         MapNode *n2 = &vm->m_data[i2];
 836                                         if (ndef->get(*n2).walkable)
 837                                                 continue;
 838                                         // Check that under side is air
 839                                         vm->m_area.add_y(em, i2, -1);
 840                                         if (vm->m_area.contains(i2) == false)
 841                                                 continue;
 842                                         n2 = &vm->m_data[i2];
 843                                         if (ndef->get(*n2).walkable)
 844                                                 continue;
 845                                         // Loop further down until not air
 846                                         bool dropped_to_unknown = false;
 847                                         do {
 848                                                 vm->m_area.add_y(em, i2, -1);
 849                                                 n2 = &vm->m_data[i2];
 850                                                 // if out of known area
 851                                                 if (vm->m_area.contains(i2) == false ||
 852                                                                 n2->getContent() == CONTENT_IGNORE) {
 853                                                         dropped_to_unknown = true;
 854                                                         break;
 855                                                 }
 856                                         } while (ndef->get(*n2).walkable == false);
 857                                         // Loop one up so that we're in air
 858                                         vm->m_area.add_y(em, i2, 1);
 859                                         n2 = &vm->m_data[i2];
 860
 861                                         bool old_is_water = (n->getContent() == c_water_source);
 862                                         // Move mud to new place
 863                                         if (!dropped_to_unknown) {
 864                                                 *n2 = *n;
 865                                                 // Set old place to be air (or water)
 866                                                 if (old_is_water)
 867                                                         *n = MapNode(c_water_source);
 868                                                 else
 869                                                         *n = MapNode(CONTENT_AIR);
 870                                         }
 871
 872                                         // Done
 873                                         break;
 874                                 }
 875                         }
 876                         }
 877                 }
 878         }
 879 }
 880
 881
 882 void MapgenV6::placeTreesAndJungleGrass()
 883 {
 884         //TimeTaker t("placeTrees");
 885         if (node_max.Y < water_level)
 886                 return;
 887
 888         PseudoRandom grassrandom(blockseed + 53);
 889         content_t c_junglegrass = ndef->getId("mapgen_junglegrass");
 890         // if we don't have junglegrass, don't place cignore... that's bad
 891         if (c_junglegrass == CONTENT_IGNORE)
 892                 c_junglegrass = CONTENT_AIR;
 893         MapNode n_junglegrass(c_junglegrass);
 894         v3s16 em = vm->m_area.getExtent();
 895
 896         // Divide area into parts
 897         s16 div = 8;
 898         s16 sidelen = central_area_size.X / div;
 899         double area = sidelen * sidelen;
 900
 901         // N.B.  We must add jungle grass first, since tree leaves will
 902         // obstruct the ground, giving us a false ground level
 903         for (s16 z0 = 0; z0 < div; z0++)
 904         for (s16 x0 = 0; x0 < div; x0++) {
 905                 // Center position of part of division
 906                 v2s16 p2d_center(
 907                         node_min.X + sidelen / 2 + sidelen * x0,
 908                         node_min.Z + sidelen / 2 + sidelen * z0
 909                 );
 910                 // Minimum edge of part of division
 911                 v2s16 p2d_min(
 912                         node_min.X + sidelen * x0,
 913                         node_min.Z + sidelen * z0
 914                 );
 915                 // Maximum edge of part of division
 916                 v2s16 p2d_max(
 917                         node_min.X + sidelen + sidelen * x0 - 1,
 918                         node_min.Z + sidelen + sidelen * z0 - 1
 919                 );
 920
 921                 // Get biome at center position of part of division
 922                 BiomeV6Type bt = getBiome(p2d_center);
 923
 924                 // Amount of trees
 925                 u32 tree_count;
 926                 if (bt == BT_JUNGLE || bt == BT_TAIGA || bt == BT_NORMAL) {
 927                         tree_count = area * getTreeAmount(p2d_center);
 928                         if (bt == BT_JUNGLE)
 929                                 tree_count *= 4;
 930                 } else {
 931                         tree_count = 0;
 932                 }
 933
 934                 // Add jungle grass
 935                 if (bt == BT_JUNGLE) {
 936                         float humidity = getHumidity(p2d_center);
 937                         u32 grass_count = 5 * humidity * tree_count;
 938                         for (u32 i = 0; i < grass_count; i++) {
 939                                 s16 x = grassrandom.range(p2d_min.X, p2d_max.X);
 940                                 s16 z = grassrandom.range(p2d_min.Y, p2d_max.Y);
 941                                 int mapindex = central_area_size.X * (z - node_min.Z)
 942                                                                 + (x - node_min.X);
 943                                 s16 y = heightmap[mapindex];
 944                                 if (y < water_level)
 945                                         continue;
 946
 947                                 u32 vi = vm->m_area.index(x, y, z);
 948                                 // place on dirt_with_grass, since we know it is exposed to sunlight
 949                                 if (vm->m_data[vi].getContent() == c_dirt_with_grass) {
 950                                         vm->m_area.add_y(em, vi, 1);
 951                                         vm->m_data[vi] = n_junglegrass;
 952                                 }
 953                         }
 954                 }
 955
 956                 // Put trees in random places on part of division
 957                 for (u32 i = 0; i < tree_count; i++) {
 958                         s16 x = myrand_range(p2d_min.X, p2d_max.X);
 959                         s16 z = myrand_range(p2d_min.Y, p2d_max.Y);
 960                         int mapindex = central_area_size.X * (z - node_min.Z)
 961                                                         + (x - node_min.X);
 962                         s16 y = heightmap[mapindex];
 963                         // Don't make a tree under water level
 964                         // Don't make a tree so high that it doesn't fit
 965                         if (y < water_level || y > node_max.Y - 6)
 966                                 continue;
 967
 968                         v3s16 p(x, y, z);
 969                         // Trees grow only on mud and grass and snowblock
 970                         {
 971                                 u32 i = vm->m_area.index(p);
 972                                 content_t c = vm->m_data[i].getContent();
 973                                 if (c != c_dirt &&
 974                                                 c != c_dirt_with_grass &&
 975                                                 c != c_dirt_with_snow &&
 976                                                 c != c_snowblock)
 977                                         continue;
 978                         }
 979                         p.Y++;
 980
 981                         // Make a tree
 982                         if (bt == BT_JUNGLE) {
 983                                 treegen::make_jungletree(*vm, p, ndef, myrand());
 984                         } else if (bt == BT_TAIGA) {
 985                                 treegen::make_pine_tree(*vm, p - v3s16(0, 1, 0), ndef, myrand());
 986                         } else if (bt == BT_NORMAL) {
 987                                 bool is_apple_tree = (myrand_range(0, 3) == 0) &&
 988                                                         getHaveAppleTree(v2s16(x, z));
 989                                 treegen::make_tree(*vm, p, is_apple_tree, ndef, myrand());
 990                         }
 991                 }
 992         }
 993         //printf("placeTreesAndJungleGrass: %dms\n", t.stop());
 994 }
 995
 996
 997 void MapgenV6::growGrass() // Add surface nodes
 998 {
 999         MapNode n_dirt_with_grass(c_dirt_with_grass);
1000         MapNode n_dirt_with_snow(c_dirt_with_snow);
1001         MapNode n_snowblock(c_snowblock);
1002         MapNode n_snow(c_snow);
1003         v3s16 em = vm->m_area.getExtent();
1004
1005         u32 index = 0;
1006         for (s16 z = full_node_min.Z; z <= full_node_max.Z; z++)
1007         for (s16 x = full_node_min.X; x <= full_node_max.X; x++, index++) {
1008                 // Find the lowest surface to which enough light ends up to make
1009                 // grass grow.  Basically just wait until not air and not leaves.
1010                 s16 surface_y = 0;
1011                 {
1012                         u32 i = vm->m_area.index(x, node_max.Y, z);
1013                         s16 y;
1014                         // Go to ground level
1015                         for (y = node_max.Y; y >= full_node_min.Y; y--) {
1016                                 MapNode &n = vm->m_data[i];
1017                                 if (ndef->get(n).param_type != CPT_LIGHT ||
1018                                                 ndef->get(n).liquid_type != LIQUID_NONE ||
1019                                                 n.getContent() == c_ice)
1020                                         break;
1021                                 vm->m_area.add_y(em, i, -1);
1022                         }
1023                         surface_y = (y >= full_node_min.Y) ? y : full_node_min.Y;
1024                 }
1025
1026                 BiomeV6Type bt = getBiome(index, v2s16(x, z));
1027                 u32 i = vm->m_area.index(x, surface_y, z);
1028                 content_t c = vm->m_data[i].getContent();
1029                 if (surface_y >= water_level - 20) {
1030                         if (bt == BT_TAIGA && c == c_dirt) {
1031                                 vm->m_data[i] = n_snowblock;
1032                                 vm->m_area.add_y(em, i, -1);
1033                                 vm->m_data[i] = n_dirt_with_snow;
1034                         } else if (bt == BT_TUNDRA) {
1035                                 if (c == c_dirt) {
1036                                         vm->m_data[i] = n_dirt_with_snow;
1037                                 } else if (c == c_stone && surface_y < node_max.Y) {
1038                                         vm->m_area.add_y(em, i, 1);
1039                                         vm->m_data[i] = n_snow;
1040                                 }
1041                         } else if (c == c_dirt) {
1042                                 vm->m_data[i] = n_dirt_with_grass;
1043                         }
1044                 }
1045         }
1046 }
1047
1048
1049 void MapgenV6::generateCaves(int max_stone_y)
1050 {
1051         float cave_amount = NoisePerlin2D(np_cave, node_min.X, node_min.Y, seed);
1052         int volume_nodes = (node_max.X - node_min.X + 1) *
1053                                            (node_max.Y - node_min.Y + 1) * MAP_BLOCKSIZE;
1054         cave_amount = MYMAX(0.0, cave_amount);
1055         u32 caves_count = cave_amount * volume_nodes / 50000;
1056         u32 bruises_count = 1;
1057         PseudoRandom ps(blockseed + 21343);
1058         PseudoRandom ps2(blockseed + 1032);
1059
1060         if (ps.range(1, 6) == 1)
1061                 bruises_count = ps.range(0, ps.range(0, 2));
1062
1063         if (getBiome(v2s16(node_min.X, node_min.Z)) == BT_DESERT) {
1064                 caves_count   /= 3;
1065                 bruises_count /= 3;
1066         }
1067
1068         for (u32 i = 0; i < caves_count + bruises_count; i++) {
1069                 bool large_cave = (i >= caves_count);
1070                 CaveV6 cave(this, &ps, &ps2, large_cave);
1071
1072                 cave.makeCave(node_min, node_max, max_stone_y);
1073         }
1074 }