src/mapgen_v6.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "mapgen.h"
  21 #include "voxel.h"
  22 #include "noise.h"
  23 #include "mapblock.h"
  24 #include "mapnode.h"
  25 #include "map.h"
  26 //#include "serverobject.h"
  27 #include "content_sao.h"
  28 #include "nodedef.h"
  29 #include "content_mapnode.h" // For content_mapnode_get_new_name
  30 #include "voxelalgorithms.h"
  31 #include "profiler.h"
  32 #include "settings.h" // For g_settings
  33 #include "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 FlagDesc flagdesc_mapgen_v6[] = {
  42         {"jungles",    MGV6_JUNGLES},
  43         {"biomeblend", MGV6_BIOMEBLEND},
  44         {"mudflow",    MGV6_MUDFLOW},
  45         {NULL,         0}
  46 };
  47
  48 ///////////////////////////////////////////////////////////////////////////////
  49
  50
  51 MapgenV6::MapgenV6(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  52         : Mapgen(mapgenid, params, emerge)
  53 {
  54         this->m_emerge = emerge;
  55         this->ystride = csize.X; //////fix this
  56
  57         this->heightmap = new s16[csize.X * csize.Z];
  58
  59         MapgenV6Params *sp = (MapgenV6Params *)params->sparams;
  60         this->spflags     = sp->spflags;
  61         this->freq_desert = sp->freq_desert;
  62         this->freq_beach  = sp->freq_beach;
  63
  64         np_cave        = &sp->np_cave;
  65         np_humidity    = &sp->np_humidity;
  66         np_trees       = &sp->np_trees;
  67         np_apple_trees = &sp->np_apple_trees;
  68
  69         //// Create noise objects
  70         noise_terrain_base   = new Noise(&sp->np_terrain_base,   seed, csize.X, csize.Y);
  71         noise_terrain_higher = new Noise(&sp->np_terrain_higher, seed, csize.X, csize.Y);
  72         noise_steepness      = new Noise(&sp->np_steepness,      seed, csize.X, csize.Y);
  73         noise_height_select  = new Noise(&sp->np_height_select,  seed, csize.X, csize.Y);
  74         noise_mud            = new Noise(&sp->np_mud,            seed, csize.X, csize.Y);
  75         noise_beach          = new Noise(&sp->np_beach,          seed, csize.X, csize.Y);
  76         noise_biome          = new Noise(&sp->np_biome,          seed, csize.X, csize.Y);
  77
  78         //// Resolve nodes to be used
  79         INodeDefManager *ndef = emerge->ndef;
  80
  81         c_stone           = ndef->getId("mapgen_stone");
  82         c_dirt            = ndef->getId("mapgen_dirt");
  83         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  84         c_sand            = ndef->getId("mapgen_sand");
  85         c_water_source    = ndef->getId("mapgen_water_source");
  86         c_lava_source     = ndef->getId("mapgen_lava_source");
  87         c_gravel          = ndef->getId("mapgen_gravel");
  88         c_cobble          = ndef->getId("mapgen_cobble");
  89         c_desert_sand     = ndef->getId("mapgen_desert_sand");
  90         c_desert_stone    = ndef->getId("mapgen_desert_stone");
  91         c_mossycobble     = ndef->getId("mapgen_mossycobble");
  92         c_sandbrick       = ndef->getId("mapgen_sandstonebrick");
  93         c_stair_cobble    = ndef->getId("mapgen_stair_cobble");
  94         c_stair_sandstone = ndef->getId("mapgen_stair_sandstone");
  95         if (c_desert_sand == CONTENT_IGNORE)
  96                 c_desert_sand = c_sand;
  97         if (c_desert_stone == CONTENT_IGNORE)
  98                 c_desert_stone = c_stone;
  99         if (c_mossycobble == CONTENT_IGNORE)
 100                 c_mossycobble = c_cobble;
 101         if (c_sandbrick == CONTENT_IGNORE)
 102                 c_sandbrick = c_desert_stone;
 103         if (c_stair_cobble == CONTENT_IGNORE)
 104                 c_stair_cobble = c_cobble;
 105         if (c_stair_sandstone == CONTENT_IGNORE)
 106                 c_stair_sandstone = c_sandbrick;
 107 }
 108
 109
 110 MapgenV6::~MapgenV6()
 111 {
 112         delete noise_terrain_base;
 113         delete noise_terrain_higher;
 114         delete noise_steepness;
 115         delete noise_height_select;
 116         delete noise_mud;
 117         delete noise_beach;
 118         delete noise_biome;
 119
 120         delete[] heightmap;
 121 }
 122
 123
 124 MapgenV6Params::MapgenV6Params()
 125 {
 126         spflags     = MGV6_BIOMEBLEND | MGV6_MUDFLOW;
 127         freq_desert = 0.45;
 128         freq_beach  = 0.15;
 129
 130         np_terrain_base   = NoiseParams(-4,  20.0, v3f(250.0, 250.0, 250.0), 82341,  5, 0.6, 2.0);
 131         np_terrain_higher = NoiseParams(20,  16.0, v3f(500.0, 500.0, 500.0), 85039,  5, 0.6, 2.0);
 132         np_steepness      = NoiseParams(0.85,0.5,  v3f(125.0, 125.0, 125.0), -932,   5, 0.7, 2.0);
 133         np_height_select  = NoiseParams(0,   1.0,  v3f(250.0, 250.0, 250.0), 4213,   5, 0.69, 2.0);
 134         np_mud            = NoiseParams(4,   2.0,  v3f(200.0, 200.0, 200.0), 91013,  3, 0.55, 2.0);
 135         np_beach          = NoiseParams(0,   1.0,  v3f(250.0, 250.0, 250.0), 59420,  3, 0.50, 2.0);
 136         np_biome          = NoiseParams(0,   1.0,  v3f(250.0, 250.0, 250.0), 9130,   3, 0.50, 2.0);
 137         np_cave           = NoiseParams(6,   6.0,  v3f(250.0, 250.0, 250.0), 34329,  3, 0.50, 2.0);
 138         np_humidity       = NoiseParams(0.5, 0.5,  v3f(500.0, 500.0, 500.0), 72384,  4, 0.66, 2.0);
 139         np_trees          = NoiseParams(0,   1.0,  v3f(125.0, 125.0, 125.0), 2,      4, 0.66, 2.0);
 140         np_apple_trees    = NoiseParams(0,   1.0,  v3f(100.0, 100.0, 100.0), 342902, 3, 0.45, 2.0);
 141 }
 142
 143
 144 void MapgenV6Params::readParams(const Settings *settings)
 145 {
 146         settings->getFlagStrNoEx("mgv6_spflags", spflags, flagdesc_mapgen_v6);
 147         settings->getFloatNoEx("mgv6_freq_desert", freq_desert);
 148         settings->getFloatNoEx("mgv6_freq_beach",  freq_beach);
 149
 150         settings->getNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 151         settings->getNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 152         settings->getNoiseParams("mgv6_np_steepness",      np_steepness);
 153         settings->getNoiseParams("mgv6_np_height_select",  np_height_select);
 154         settings->getNoiseParams("mgv6_np_mud",            np_mud);
 155         settings->getNoiseParams("mgv6_np_beach",          np_beach);
 156         settings->getNoiseParams("mgv6_np_biome",          np_biome);
 157         settings->getNoiseParams("mgv6_np_cave",           np_cave);
 158         settings->getNoiseParams("mgv6_np_humidity",       np_humidity);
 159         settings->getNoiseParams("mgv6_np_trees",          np_trees);
 160         settings->getNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 161 }
 162
 163
 164 void MapgenV6Params::writeParams(Settings *settings) const
 165 {
 166         settings->setFlagStr("mgv6_spflags", spflags, flagdesc_mapgen_v6, (u32)-1);
 167         settings->setFloat("mgv6_freq_desert", freq_desert);
 168         settings->setFloat("mgv6_freq_beach",  freq_beach);
 169
 170         settings->setNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 171         settings->setNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 172         settings->setNoiseParams("mgv6_np_steepness",      np_steepness);
 173         settings->setNoiseParams("mgv6_np_height_select",  np_height_select);
 174         settings->setNoiseParams("mgv6_np_mud",            np_mud);
 175         settings->setNoiseParams("mgv6_np_beach",          np_beach);
 176         settings->setNoiseParams("mgv6_np_biome",          np_biome);
 177         settings->setNoiseParams("mgv6_np_cave",           np_cave);
 178         settings->setNoiseParams("mgv6_np_humidity",       np_humidity);
 179         settings->setNoiseParams("mgv6_np_trees",          np_trees);
 180         settings->setNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 181 }
 182
 183
 184 //////////////////////// Some helper functions for the map generator
 185
 186
 187 // Returns Y one under area minimum if not found
 188 s16 MapgenV6::find_stone_level(v2s16 p2d)
 189 {
 190         v3s16 em = vm->m_area.getExtent();
 191         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 192         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 193         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 194         s16 y;
 195
 196         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 197                 MapNode &n = vm->m_data[i];
 198                 content_t c = n.getContent();
 199                 if (c != CONTENT_IGNORE && (
 200                         c == c_stone || c == c_desert_stone))
 201                         break;
 202
 203                 vm->m_area.add_y(em, i, -1);
 204         }
 205         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 206 }
 207
 208
 209 // Required by mapgen.h
 210 bool MapgenV6::block_is_underground(u64 seed, v3s16 blockpos)
 211 {
 212         /*s16 minimum_groundlevel = (s16)get_sector_minimum_ground_level(
 213                         seed, v2s16(blockpos.X, blockpos.Z));*/
 214         // Nah, this is just a heuristic, just return something
 215         s16 minimum_groundlevel = water_level;
 216
 217         if(blockpos.Y*MAP_BLOCKSIZE + MAP_BLOCKSIZE <= minimum_groundlevel)
 218                 return true;
 219         else
 220                 return false;
 221 }
 222
 223
 224 //////////////////////// Base terrain height functions
 225
 226 float MapgenV6::baseTerrainLevel(float terrain_base, float terrain_higher,
 227         float steepness, float height_select)
 228 {
 229         float base   = 1 + terrain_base;
 230         float higher = 1 + terrain_higher;
 231
 232         // Limit higher ground level to at least base
 233         if(higher < base)
 234                 higher = base;
 235
 236         // Steepness factor of cliffs
 237         float b = steepness;
 238         b = rangelim(b, 0.0, 1000.0);
 239         b = 5 * b * b * b * b * b * b * b;
 240         b = rangelim(b, 0.5, 1000.0);
 241
 242         // Values 1.5...100 give quite horrible looking slopes
 243         if (b > 1.5 && b < 100.0)
 244                 b = (b < 10.0) ? 1.5 : 100.0;
 245
 246         float a_off = -0.20; // Offset to more low
 247         float a = 0.5 + b * (a_off + height_select);
 248         a = rangelim(a, 0.0, 1.0); // Limit
 249
 250         return base * (1.0 - a) + higher * a;
 251 }
 252
 253
 254 float MapgenV6::baseTerrainLevelFromNoise(v2s16 p)
 255 {
 256         if (flags & MG_FLAT)
 257                 return water_level;
 258
 259         float terrain_base   = NoisePerlin2D_PO(&noise_terrain_base->np,
 260                                                         p.X, 0.5, p.Y, 0.5, seed);
 261         float terrain_higher = NoisePerlin2D_PO(&noise_terrain_higher->np,
 262                                                         p.X, 0.5, p.Y, 0.5, seed);
 263         float steepness      = NoisePerlin2D_PO(&noise_steepness->np,
 264                                                         p.X, 0.5, p.Y, 0.5, seed);
 265         float height_select  = NoisePerlin2D_PO(&noise_height_select->np,
 266                                                         p.X, 0.5, p.Y, 0.5, seed);
 267
 268         return baseTerrainLevel(terrain_base, terrain_higher,
 269                                                         steepness,    height_select);
 270 }
 271
 272
 273 float MapgenV6::baseTerrainLevelFromMap(v2s16 p)
 274 {
 275         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 276         return baseTerrainLevelFromMap(index);
 277 }
 278
 279
 280 float MapgenV6::baseTerrainLevelFromMap(int index)
 281 {
 282         if (flags & MG_FLAT)
 283                 return water_level;
 284
 285         float terrain_base   = noise_terrain_base->result[index];
 286         float terrain_higher = noise_terrain_higher->result[index];
 287         float steepness      = noise_steepness->result[index];
 288         float height_select  = noise_height_select->result[index];
 289
 290         return baseTerrainLevel(terrain_base, terrain_higher,
 291                                                         steepness,    height_select);
 292 }
 293
 294
 295 s16 MapgenV6::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision)
 296 {
 297         return baseTerrainLevelFromNoise(p2d) + AVERAGE_MUD_AMOUNT;
 298 }
 299
 300
 301 int MapgenV6::getGroundLevelAtPoint(v2s16 p)
 302 {
 303         return baseTerrainLevelFromNoise(p) + AVERAGE_MUD_AMOUNT;
 304 }
 305
 306
 307 //////////////////////// Noise functions
 308
 309 float MapgenV6::getMudAmount(v2s16 p)
 310 {
 311         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 312         return getMudAmount(index);
 313 }
 314
 315
 316 bool MapgenV6::getHaveBeach(v2s16 p)
 317 {
 318         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 319         return getHaveBeach(index);
 320 }
 321
 322
 323 BiomeV6Type MapgenV6::getBiome(v2s16 p)
 324 {
 325         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 326         return getBiome(index, p);
 327 }
 328
 329
 330 float MapgenV6::getHumidity(v2s16 p)
 331 {
 332         /*double noise = noise2d_perlin(
 333                 0.5+(float)p.X/500, 0.5+(float)p.Y/500,
 334                 seed+72384, 4, 0.66);
 335         noise = (noise + 1.0)/2.0;*/
 336
 337         float noise = NoisePerlin2D(np_humidity, p.X, p.Y, seed);
 338
 339         if (noise < 0.0)
 340                 noise = 0.0;
 341         if (noise > 1.0)
 342                 noise = 1.0;
 343         return noise;
 344 }
 345
 346
 347 float MapgenV6::getTreeAmount(v2s16 p)
 348 {
 349         /*double noise = noise2d_perlin(
 350                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 351                         seed+2, 4, 0.66);*/
 352
 353         float noise = NoisePerlin2D(np_trees, p.X, p.Y, seed);
 354         float zeroval = -0.39;
 355         if (noise < zeroval)
 356                 return 0;
 357         else
 358                 return 0.04 * (noise-zeroval) / (1.0-zeroval);
 359 }
 360
 361
 362 bool MapgenV6::getHaveAppleTree(v2s16 p)
 363 {
 364         /*is_apple_tree = noise2d_perlin(
 365                 0.5+(float)p.X/100, 0.5+(float)p.Z/100,
 366                 data->seed+342902, 3, 0.45) > 0.2;*/
 367
 368         float noise = NoisePerlin2D(np_apple_trees, p.X, p.Y, seed);
 369
 370         return noise > 0.2;
 371 }
 372
 373
 374 float MapgenV6::getMudAmount(int index)
 375 {
 376         if (flags & MG_FLAT)
 377                 return AVERAGE_MUD_AMOUNT;
 378
 379         /*return ((float)AVERAGE_MUD_AMOUNT + 2.0 * noise2d_perlin(
 380                         0.5+(float)p.X/200, 0.5+(float)p.Y/200,
 381                         seed+91013, 3, 0.55));*/
 382
 383         return noise_mud->result[index];
 384 }
 385
 386
 387 bool MapgenV6::getHaveBeach(int index)
 388 {
 389         // Determine whether to have sand here
 390         /*double sandnoise = noise2d_perlin(
 391                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 392                         seed+59420, 3, 0.50);*/
 393
 394         float sandnoise = noise_beach->result[index];
 395         return (sandnoise > freq_beach);
 396 }
 397
 398
 399 BiomeV6Type MapgenV6::getBiome(int index, v2s16 p)
 400 {
 401         // Just do something very simple as for now
 402         /*double d = noise2d_perlin(
 403                         0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
 404                         seed+9130, 3, 0.50);*/
 405
 406         float d = noise_biome->result[index];
 407         if (d > freq_desert)
 408                 return BT_DESERT;
 409
 410         if ((spflags & MGV6_BIOMEBLEND) &&
 411                 (d > freq_desert - 0.10) &&
 412                 ((noise2d(p.X, p.Y, seed) + 1.0) > (freq_desert - d) * 20.0))
 413                 return BT_DESERT;
 414
 415         return BT_NORMAL;
 416 }
 417
 418
 419 u32 MapgenV6::get_blockseed(u64 seed, v3s16 p)
 420 {
 421         s32 x=p.X, y=p.Y, z=p.Z;
 422         return (u32)(seed%0x100000000ULL) + z*38134234 + y*42123 + x*23;
 423 }
 424
 425
 426 //////////////////////// Map generator
 427
 428 void MapgenV6::makeChunk(BlockMakeData *data)
 429 {
 430         // Pre-conditions
 431         assert(data->vmanip);
 432         assert(data->nodedef);
 433         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 434                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 435                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 436         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 437                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 438                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 439
 440         this->generating = true;
 441         this->vm   = data->vmanip;
 442         this->ndef = data->nodedef;
 443
 444         // Hack: use minimum block coords for old code that assumes a single block
 445         v3s16 blockpos_min = data->blockpos_min;
 446         v3s16 blockpos_max = data->blockpos_max;
 447
 448         // Area of central chunk
 449         node_min = blockpos_min*MAP_BLOCKSIZE;
 450         node_max = (blockpos_max+v3s16(1,1,1))*MAP_BLOCKSIZE-v3s16(1,1,1);
 451
 452         // Full allocated area
 453         full_node_min = (blockpos_min-1)*MAP_BLOCKSIZE;
 454         full_node_max = (blockpos_max+2)*MAP_BLOCKSIZE-v3s16(1,1,1);
 455
 456         central_area_size = node_max - node_min + v3s16(1,1,1);
 457         assert(central_area_size.X == central_area_size.Z);
 458
 459         int volume_blocks = (blockpos_max.X - blockpos_min.X + 1)
 460                                           * (blockpos_max.Y - blockpos_min.Y + 1)
 461                                           * (blockpos_max.Z - blockpos_max.Z + 1);
 462
 463         volume_nodes = volume_blocks *
 464                 MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 465
 466         // Create a block-specific seed
 467         blockseed = get_blockseed(data->seed, full_node_min);
 468
 469         // Make some noise
 470         calculateNoise();
 471
 472         // Maximum height of the stone surface and obstacles.
 473         // This is used to guide the cave generation
 474         s16 stone_surface_max_y;
 475
 476         // Generate general ground level to full area
 477         stone_surface_max_y = generateGround();
 478
 479         // Create initial heightmap to limit caves
 480         updateHeightmap(node_min, node_max);
 481
 482         const s16 max_spread_amount = MAP_BLOCKSIZE;
 483         // Limit dirt flow area by 1 because mud is flown into neighbors.
 484         s16 mudflow_minpos = -max_spread_amount + 1;
 485         s16 mudflow_maxpos = central_area_size.X + max_spread_amount - 2;
 486
 487         // Loop this part, it will make stuff look older and newer nicely
 488         const u32 age_loops = 2;
 489         for (u32 i_age = 0; i_age < age_loops; i_age++) { // Aging loop
 490                 // Make caves (this code is relatively horrible)
 491                 if (flags & MG_CAVES)
 492                         generateCaves(stone_surface_max_y);
 493
 494                 // Add mud to the central chunk
 495                 addMud();
 496
 497                 // Flow mud away from steep edges
 498                 if (spflags & MGV6_MUDFLOW)
 499                         flowMud(mudflow_minpos, mudflow_maxpos);
 500
 501         }
 502
 503         // Update heightmap after mudflow
 504         updateHeightmap(node_min, node_max);
 505
 506         // Add dungeons
 507         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 508                 DungeonParams dp;
 509
 510                 dp.np_rarity  = nparams_dungeon_rarity;
 511                 dp.np_density = nparams_dungeon_density;
 512                 dp.np_wetness = nparams_dungeon_wetness;
 513                 dp.c_water = c_water_source;
 514                 if (getBiome(0, v2s16(node_min.X, node_min.Z)) == BT_NORMAL) {
 515                         dp.c_cobble  = c_cobble;
 516                         dp.c_moss    = c_mossycobble;
 517                         dp.c_stair   = c_stair_cobble;
 518
 519                         dp.diagonal_dirs = false;
 520                         dp.mossratio  = 3.0;
 521                         dp.holesize   = v3s16(1, 2, 1);
 522                         dp.roomsize   = v3s16(0, 0, 0);
 523                         dp.notifytype = GENNOTIFY_DUNGEON;
 524                 } else {
 525                         dp.c_cobble  = c_sandbrick;
 526                         dp.c_moss    = c_sandbrick; // should make this 'cracked sandstone' later
 527                         dp.c_stair   = c_stair_sandstone;
 528
 529                         dp.diagonal_dirs = true;
 530                         dp.mossratio  = 0.0;
 531                         dp.holesize   = v3s16(2, 3, 2);
 532                         dp.roomsize   = v3s16(2, 5, 2);
 533                         dp.notifytype = GENNOTIFY_TEMPLE;
 534                 }
 535
 536                 DungeonGen dgen(this, &dp);
 537                 dgen.generate(blockseed, full_node_min, full_node_max);
 538         }
 539
 540         // Add top and bottom side of water to transforming_liquid queue
 541         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 542
 543         // Grow grass
 544         growGrass();
 545
 546         // Generate some trees, and add grass, if a jungle
 547         if (flags & MG_TREES)
 548                 placeTreesAndJungleGrass();
 549
 550         // Generate the registered decorations
 551         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 552
 553         // Generate the registered ores
 554         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 555
 556         // Calculate lighting
 557         if (flags & MG_LIGHT)
 558                 calcLighting(node_min, node_max);
 559
 560         this->generating = false;
 561 }
 562
 563
 564 void MapgenV6::calculateNoise()
 565 {
 566         int x = node_min.X;
 567         int z = node_min.Z;
 568
 569         if (!(flags & MG_FLAT)) {
 570                 noise_terrain_base->perlinMap2D_PO(x, 0.5, z, 0.5);
 571                 noise_terrain_higher->perlinMap2D_PO(x, 0.5, z, 0.5);
 572                 noise_steepness->perlinMap2D_PO(x, 0.5, z, 0.5);
 573                 noise_height_select->perlinMap2D_PO(x, 0.5, z, 0.5);
 574                 noise_mud->perlinMap2D_PO(x, 0.5, z, 0.5);
 575         }
 576
 577         noise_beach->perlinMap2D_PO(x, 0.2, z, 0.7);
 578         noise_biome->perlinMap2D_PO(x, 0.6, z, 0.2);
 579 }
 580
 581
 582 int MapgenV6::generateGround()
 583 {
 584         //TimeTaker timer1("Generating ground level");
 585         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 586         MapNode n_stone(c_stone), n_desert_stone(c_desert_stone);
 587         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 588         u32 index = 0;
 589
 590         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 591         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 592                 // Surface height
 593                 s16 surface_y = (s16)baseTerrainLevelFromMap(index);
 594
 595                 // Log it
 596                 if (surface_y > stone_surface_max_y)
 597                         stone_surface_max_y = surface_y;
 598
 599                 BiomeV6Type bt = getBiome(index, v2s16(x, z));
 600
 601                 // Fill ground with stone
 602                 v3s16 em = vm->m_area.getExtent();
 603                 u32 i = vm->m_area.index(x, node_min.Y, z);
 604                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 605                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 606                                 if (y <= surface_y) {
 607                                         vm->m_data[i] = (y >= DESERT_STONE_BASE
 608                                                                 && bt == BT_DESERT) ?
 609                                                 n_desert_stone : n_stone;
 610                                 } else if (y <= water_level) {
 611                                         vm->m_data[i] = n_water_source;
 612                                 } else {
 613                                         vm->m_data[i] = n_air;
 614                                 }
 615                         }
 616                         vm->m_area.add_y(em, i, 1);
 617                 }
 618         }
 619
 620         return stone_surface_max_y;
 621 }
 622
 623
 624 void MapgenV6::addMud()
 625 {
 626         // 15ms @cs=8
 627         //TimeTaker timer1("add mud");
 628         MapNode n_dirt(c_dirt), n_gravel(c_gravel);
 629         MapNode n_sand(c_sand), n_desert_sand(c_desert_sand);
 630         MapNode addnode;
 631
 632         u32 index = 0;
 633         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 634         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 635                 // Randomize mud amount
 636                 s16 mud_add_amount = getMudAmount(index) / 2.0 + 0.5;
 637
 638                 // Find ground level
 639                 s16 surface_y = find_stone_level(v2s16(x, z)); /////////////////optimize this!
 640
 641                 // Handle area not found
 642                 if (surface_y == vm->m_area.MinEdge.Y - 1)
 643                         continue;
 644
 645                 BiomeV6Type bt = getBiome(index, v2s16(x, z));
 646                 addnode = (bt == BT_DESERT) ? n_desert_sand : n_dirt;
 647
 648                 if (bt == BT_DESERT && surface_y + mud_add_amount <= water_level + 1) {
 649                         addnode = n_sand;
 650                 } else if (mud_add_amount <= 0) {
 651                         mud_add_amount = 1 - mud_add_amount;
 652                         addnode = n_gravel;
 653                 } else if (bt == BT_NORMAL && getHaveBeach(index) &&
 654                                 surface_y + mud_add_amount <= water_level + 2) {
 655                         addnode = n_sand;
 656                 }
 657
 658                 if (bt == BT_DESERT && surface_y > 20)
 659                         mud_add_amount = MYMAX(0, mud_add_amount - (surface_y - 20) / 5);
 660
 661                 // If topmost node is grass, change it to mud.  It might be if it was
 662                 // flown to there from a neighboring chunk and then converted.
 663                 u32 i = vm->m_area.index(x, surface_y, z);
 664                 if (vm->m_data[i].getContent() == c_dirt_with_grass)
 665                         vm->m_data[i] = n_dirt;
 666
 667                 // Add mud on ground
 668                 s16 mudcount = 0;
 669                 v3s16 em = vm->m_area.getExtent();
 670                 s16 y_start = surface_y + 1;
 671                 i = vm->m_area.index(x, y_start, z);
 672                 for (s16 y = y_start; y <= node_max.Y; y++) {
 673                         if (mudcount >= mud_add_amount)
 674                                 break;
 675
 676                         vm->m_data[i] = addnode;
 677                         mudcount++;
 678
 679                         vm->m_area.add_y(em, i, 1);
 680                 }
 681         }
 682 }
 683
 684
 685 void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos)
 686 {
 687         // 340ms @cs=8
 688         TimeTaker timer1("flow mud");
 689
 690         // Iterate a few times
 691         for(s16 k = 0; k < 3; k++) {
 692                 for (s16 z = mudflow_minpos; z <= mudflow_maxpos; z++)
 693                 for (s16 x = mudflow_minpos; x <= mudflow_maxpos; x++) {
 694                         // Invert coordinates every 2nd iteration
 695                         if (k % 2 == 0) {
 696                                 x = mudflow_maxpos - (x - mudflow_minpos);
 697                                 z = mudflow_maxpos - (z - mudflow_minpos);
 698                         }
 699
 700                         // Node position in 2d
 701                         v2s16 p2d = v2s16(node_min.X, node_min.Z) + v2s16(x, z);
 702
 703                         v3s16 em = vm->m_area.getExtent();
 704                         u32 i = vm->m_area.index(p2d.X, node_max.Y, p2d.Y);
 705                         s16 y = node_max.Y;
 706
 707                         while(y >= node_min.Y)
 708                         {
 709
 710                         for(;; y--)
 711                         {
 712                                 MapNode *n = NULL;
 713                                 // Find mud
 714                                 for(; y >= node_min.Y; y--) {
 715                                         n = &vm->m_data[i];
 716                                         if (n->getContent() == c_dirt ||
 717                                                 n->getContent() == c_dirt_with_grass ||
 718                                                 n->getContent() == c_gravel)
 719                                                 break;
 720
 721                                         vm->m_area.add_y(em, i, -1);
 722                                 }
 723
 724                                 // Stop if out of area
 725                                 //if(vmanip.m_area.contains(i) == false)
 726                                 if (y < node_min.Y)
 727                                         break;
 728
 729                                 if (n->getContent() == c_dirt ||
 730                                         n->getContent() == c_dirt_with_grass)
 731                                 {
 732                                         // Make it exactly mud
 733                                         n->setContent(c_dirt);
 734
 735                                         // Don't flow it if the stuff under it is not mud
 736                                         {
 737                                                 u32 i2 = i;
 738                                                 vm->m_area.add_y(em, i2, -1);
 739                                                 // Cancel if out of area
 740                                                 if(vm->m_area.contains(i2) == false)
 741                                                         continue;
 742                                                 MapNode *n2 = &vm->m_data[i2];
 743                                                 if (n2->getContent() != c_dirt &&
 744                                                         n2->getContent() != c_dirt_with_grass)
 745                                                         continue;
 746                                         }
 747                                 }
 748
 749                                 v3s16 dirs4[4] = {
 750                                         v3s16(0,0,1), // back
 751                                         v3s16(1,0,0), // right
 752                                         v3s16(0,0,-1), // front
 753                                         v3s16(-1,0,0), // left
 754                                 };
 755
 756                                 // Check that upper is air or doesn't exist.
 757                                 // Cancel dropping if upper keeps it in place
 758                                 u32 i3 = i;
 759                                 vm->m_area.add_y(em, i3, 1);
 760                                 if (vm->m_area.contains(i3) == true &&
 761                                         ndef->get(vm->m_data[i3]).walkable)
 762                                         continue;
 763
 764                                 // Drop mud on side
 765                                 for(u32 di=0; di<4; di++) {
 766                                         v3s16 dirp = dirs4[di];
 767                                         u32 i2 = i;
 768                                         // Move to side
 769                                         vm->m_area.add_p(em, i2, dirp);
 770                                         // Fail if out of area
 771                                         if (vm->m_area.contains(i2) == false)
 772                                                 continue;
 773                                         // Check that side is air
 774                                         MapNode *n2 = &vm->m_data[i2];
 775                                         if (ndef->get(*n2).walkable)
 776                                                 continue;
 777                                         // Check that under side is air
 778                                         vm->m_area.add_y(em, i2, -1);
 779                                         if (vm->m_area.contains(i2) == false)
 780                                                 continue;
 781                                         n2 = &vm->m_data[i2];
 782                                         if (ndef->get(*n2).walkable)
 783                                                 continue;
 784                                         // Loop further down until not air
 785                                         bool dropped_to_unknown = false;
 786                                         do {
 787                                                 vm->m_area.add_y(em, i2, -1);
 788                                                 n2 = &vm->m_data[i2];
 789                                                 // if out of known area
 790                                                 if(vm->m_area.contains(i2) == false ||
 791                                                         n2->getContent() == CONTENT_IGNORE) {
 792                                                         dropped_to_unknown = true;
 793                                                         break;
 794                                                 }
 795                                         } while (ndef->get(*n2).walkable == false);
 796                                         // Loop one up so that we're in air
 797                                         vm->m_area.add_y(em, i2, 1);
 798                                         n2 = &vm->m_data[i2];
 799
 800                                         bool old_is_water = (n->getContent() == c_water_source);
 801                                         // Move mud to new place
 802                                         if (!dropped_to_unknown) {
 803                                                 *n2 = *n;
 804                                                 // Set old place to be air (or water)
 805                                                 if(old_is_water)
 806                                                         *n = MapNode(c_water_source);
 807                                                 else
 808                                                         *n = MapNode(CONTENT_AIR);
 809                                         }
 810
 811                                         // Done
 812                                         break;
 813                                 }
 814                         }
 815                         }
 816                 }
 817         }
 818 }
 819
 820
 821 void MapgenV6::placeTreesAndJungleGrass()
 822 {
 823         //TimeTaker t("placeTrees");
 824         if (node_max.Y < water_level)
 825                 return;
 826
 827         PseudoRandom grassrandom(blockseed + 53);
 828         content_t c_junglegrass = ndef->getId("mapgen_junglegrass");
 829         // if we don't have junglegrass, don't place cignore... that's bad
 830         if (c_junglegrass == CONTENT_IGNORE)
 831                 c_junglegrass = CONTENT_AIR;
 832         MapNode n_junglegrass(c_junglegrass);
 833         v3s16 em = vm->m_area.getExtent();
 834
 835         // Divide area into parts
 836         s16 div = 8;
 837         s16 sidelen = central_area_size.X / div;
 838         double area = sidelen * sidelen;
 839
 840         // N.B.  We must add jungle grass first, since tree leaves will
 841         // obstruct the ground, giving us a false ground level
 842         for (s16 z0 = 0; z0 < div; z0++)
 843         for (s16 x0 = 0; x0 < div; x0++) {
 844                 // Center position of part of division
 845                 v2s16 p2d_center(
 846                         node_min.X + sidelen / 2 + sidelen * x0,
 847                         node_min.Z + sidelen / 2 + sidelen * z0
 848                 );
 849                 // Minimum edge of part of division
 850                 v2s16 p2d_min(
 851                         node_min.X + sidelen * x0,
 852                         node_min.Z + sidelen * z0
 853                 );
 854                 // Maximum edge of part of division
 855                 v2s16 p2d_max(
 856                         node_min.X + sidelen + sidelen * x0 - 1,
 857                         node_min.Z + sidelen + sidelen * z0 - 1
 858                 );
 859
 860                 // Amount of trees, jungle area
 861                 u32 tree_count = area * getTreeAmount(p2d_center);
 862
 863                 float humidity;
 864                 bool is_jungle = false;
 865                 if (spflags & MGV6_JUNGLES) {
 866                         humidity = getHumidity(p2d_center);
 867                         if (humidity > 0.75) {
 868                                 is_jungle = true;
 869                                 tree_count *= 4;
 870                         }
 871                 }
 872
 873                 // Add jungle grass
 874                 if (is_jungle) {
 875                         u32 grass_count = 5 * humidity * tree_count;
 876                         for (u32 i = 0; i < grass_count; i++) {
 877                                 s16 x = grassrandom.range(p2d_min.X, p2d_max.X);
 878                                 s16 z = grassrandom.range(p2d_min.Y, p2d_max.Y);
 879                                 int mapindex = central_area_size.X * (z - node_min.Z)
 880                                                                 + (x - node_min.X);
 881                                 s16 y = heightmap[mapindex];
 882                                 if (y < water_level)
 883                                         continue;
 884
 885                                 u32 vi = vm->m_area.index(x, y, z);
 886                                 // place on dirt_with_grass, since we know it is exposed to sunlight
 887                                 if (vm->m_data[vi].getContent() == c_dirt_with_grass) {
 888                                         vm->m_area.add_y(em, vi, 1);
 889                                         vm->m_data[vi] = n_junglegrass;
 890                                 }
 891                         }
 892                 }
 893
 894                 // Put trees in random places on part of division
 895                 for (u32 i = 0; i < tree_count; i++) {
 896                         s16 x = myrand_range(p2d_min.X, p2d_max.X);
 897                         s16 z = myrand_range(p2d_min.Y, p2d_max.Y);
 898                         int mapindex = central_area_size.X * (z - node_min.Z)
 899                                                         + (x - node_min.X);
 900                         s16 y = heightmap[mapindex];
 901                         // Don't make a tree under water level
 902                         // Don't make a tree so high that it doesn't fit
 903                         if(y < water_level || y > node_max.Y - 6)
 904                                 continue;
 905
 906                         v3s16 p(x,y,z);
 907                         // Trees grow only on mud and grass
 908                         {
 909                                 u32 i = vm->m_area.index(p);
 910                                 MapNode *n = &vm->m_data[i];
 911                                 if (n->getContent() != c_dirt &&
 912                                         n->getContent() != c_dirt_with_grass)
 913                                         continue;
 914                         }
 915                         p.Y++;
 916
 917                         // Make a tree
 918                         if (is_jungle) {
 919                                 treegen::make_jungletree(*vm, p, ndef, myrand());
 920                         } else {
 921                                 bool is_apple_tree = (myrand_range(0, 3) == 0) &&
 922                                                         getHaveAppleTree(v2s16(x, z));
 923                                 treegen::make_tree(*vm, p, is_apple_tree, ndef, myrand());
 924                         }
 925                 }
 926         }
 927         //printf("placeTreesAndJungleGrass: %dms\n", t.stop());
 928 }
 929
 930
 931 void MapgenV6::growGrass()
 932 {
 933         for (s16 z = full_node_min.Z; z <= full_node_max.Z; z++)
 934         for (s16 x = full_node_min.X; x <= full_node_max.X; x++) {
 935                 // Find the lowest surface to which enough light ends up to make
 936                 // grass grow.  Basically just wait until not air and not leaves.
 937                 s16 surface_y = 0;
 938                 {
 939                         v3s16 em = vm->m_area.getExtent();
 940                         u32 i = vm->m_area.index(x, node_max.Y, z);
 941                         s16 y;
 942                         // Go to ground level
 943                         for (y = node_max.Y; y >= full_node_min.Y; y--) {
 944                                 MapNode &n = vm->m_data[i];
 945                                 if (ndef->get(n).param_type != CPT_LIGHT ||
 946                                         ndef->get(n).liquid_type != LIQUID_NONE)
 947                                         break;
 948                                 vm->m_area.add_y(em, i, -1);
 949                         }
 950                         surface_y = (y >= full_node_min.Y) ? y : full_node_min.Y;
 951                 }
 952
 953                 u32 i = vm->m_area.index(x, surface_y, z);
 954                 MapNode *n = &vm->m_data[i];
 955                 if (n->getContent() == c_dirt && surface_y >= water_level - 20)
 956                         n->setContent(c_dirt_with_grass);
 957         }
 958 }
 959
 960
 961 void MapgenV6::generateCaves(int max_stone_y)
 962 {
 963         float cave_amount = NoisePerlin2D(np_cave, node_min.X, node_min.Y, seed);
 964         int volume_nodes = (node_max.X - node_min.X + 1) *
 965                                            (node_max.Y - node_min.Y + 1) * MAP_BLOCKSIZE;
 966         cave_amount = MYMAX(0.0, cave_amount);
 967         u32 caves_count = cave_amount * volume_nodes / 50000;
 968         u32 bruises_count = 1;
 969         PseudoRandom ps(blockseed + 21343);
 970         PseudoRandom ps2(blockseed + 1032);
 971
 972         if (ps.range(1, 6) == 1)
 973                 bruises_count = ps.range(0, ps.range(0, 2));
 974
 975         if (getBiome(v2s16(node_min.X, node_min.Z)) == BT_DESERT) {
 976                 caves_count   /= 3;
 977                 bruises_count /= 3;
 978         }
 979
 980         for (u32 i = 0; i < caves_count + bruises_count; i++) {
 981                 bool large_cave = (i >= caves_count);
 982                 CaveV6 cave(this, &ps, &ps2, large_cave);
 983
 984                 cave.makeCave(node_min, node_max, max_stone_y);
 985         }
 986 }