src/mapgen_v6.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "mapgen.h"
  21 #include "voxel.h"
  22 #include "noise.h"
  23 #include "mapblock.h"
  24 #include "mapnode.h"
  25 #include "map.h"
  26 //#include "serverobject.h"
  27 #include "content_sao.h"
  28 #include "nodedef.h"
  29 #include "content_mapnode.h" // For content_mapnode_get_new_name
  30 #include "voxelalgorithms.h"
  31 #include "profiler.h"
  32 #include "settings.h" // For g_settings
  33 #include "main.h" // For g_profiler
  34 #include "emerge.h"
  35 #include "dungeongen.h"
  36 #include "cavegen.h"
  37 #include "treegen.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_v6.h"
  41
  42 FlagDesc flagdesc_mapgen_v6[] = {
  43         {"jungles",    MGV6_JUNGLES},
  44         {"biomeblend", MGV6_BIOMEBLEND},
  45         {"mudflow",    MGV6_MUDFLOW},
  46         {NULL,         0}
  47 };
  48
  49 ///////////////////////////////////////////////////////////////////////////////
  50
  51
  52 MapgenV6::MapgenV6(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  53         : Mapgen(mapgenid, params, emerge)
  54 {
  55         this->m_emerge = emerge;
  56         this->ystride = csize.X; //////fix this
  57
  58         this->heightmap = new s16[csize.X * csize.Z];
  59
  60         initHeightMap(this->heightmap, csize.X * csize.Z);
  61
  62         MapgenV6Params *sp = (MapgenV6Params *)params->sparams;
  63         this->spflags     = sp->spflags;
  64         this->freq_desert = sp->freq_desert;
  65         this->freq_beach  = sp->freq_beach;
  66
  67         np_cave        = &sp->np_cave;
  68         np_humidity    = &sp->np_humidity;
  69         np_trees       = &sp->np_trees;
  70         np_apple_trees = &sp->np_apple_trees;
  71
  72         //// Create noise objects
  73         noise_terrain_base   = new Noise(&sp->np_terrain_base,   seed, csize.X, csize.Y);
  74         noise_terrain_higher = new Noise(&sp->np_terrain_higher, seed, csize.X, csize.Y);
  75         noise_steepness      = new Noise(&sp->np_steepness,      seed, csize.X, csize.Y);
  76         noise_height_select  = new Noise(&sp->np_height_select,  seed, csize.X, csize.Y);
  77         noise_mud            = new Noise(&sp->np_mud,            seed, csize.X, csize.Y);
  78         noise_beach          = new Noise(&sp->np_beach,          seed, csize.X, csize.Y);
  79         noise_biome          = new Noise(&sp->np_biome,          seed, csize.X, csize.Y);
  80
  81         //// Resolve nodes to be used
  82         INodeDefManager *ndef = emerge->ndef;
  83
  84         c_stone           = ndef->getId("mapgen_stone");
  85         c_dirt            = ndef->getId("mapgen_dirt");
  86         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  87         c_sand            = ndef->getId("mapgen_sand");
  88         c_water_source    = ndef->getId("mapgen_water_source");
  89         c_lava_source     = ndef->getId("mapgen_lava_source");
  90         c_gravel          = ndef->getId("mapgen_gravel");
  91         c_cobble          = ndef->getId("mapgen_cobble");
  92         c_desert_sand     = ndef->getId("mapgen_desert_sand");
  93         c_desert_stone    = ndef->getId("mapgen_desert_stone");
  94         c_mossycobble     = ndef->getId("mapgen_mossycobble");
  95         c_sandbrick       = ndef->getId("mapgen_sandstonebrick");
  96         c_stair_cobble    = ndef->getId("mapgen_stair_cobble");
  97         c_stair_sandstone = ndef->getId("mapgen_stair_sandstone");
  98         if (c_desert_sand == CONTENT_IGNORE)
  99                 c_desert_sand = c_sand;
 100         if (c_desert_stone == CONTENT_IGNORE)
 101                 c_desert_stone = c_stone;
 102         if (c_mossycobble == CONTENT_IGNORE)
 103                 c_mossycobble = c_cobble;
 104         if (c_sandbrick == CONTENT_IGNORE)
 105                 c_sandbrick = c_desert_stone;
 106         if (c_stair_cobble == CONTENT_IGNORE)
 107                 c_stair_cobble = c_cobble;
 108         if (c_stair_sandstone == CONTENT_IGNORE)
 109                 c_stair_sandstone = c_sandbrick;
 110 }
 111
 112
 113 MapgenV6::~MapgenV6()
 114 {
 115         delete noise_terrain_base;
 116         delete noise_terrain_higher;
 117         delete noise_steepness;
 118         delete noise_height_select;
 119         delete noise_mud;
 120         delete noise_beach;
 121         delete noise_biome;
 122
 123         delete[] heightmap;
 124 }
 125
 126
 127 MapgenV6Params::MapgenV6Params()
 128 {
 129         spflags     = MGV6_BIOMEBLEND | MGV6_MUDFLOW;
 130         freq_desert = 0.45;
 131         freq_beach  = 0.15;
 132
 133         np_terrain_base   = NoiseParams(-4,  20.0, v3f(250.0, 250.0, 250.0), 82341,  5, 0.6, 2.0);
 134         np_terrain_higher = NoiseParams(20,  16.0, v3f(500.0, 500.0, 500.0), 85039,  5, 0.6, 2.0);
 135         np_steepness      = NoiseParams(0.85,0.5,  v3f(125.0, 125.0, 125.0), -932,   5, 0.7, 2.0);
 136         np_height_select  = NoiseParams(0,   1.0,  v3f(250.0, 250.0, 250.0), 4213,   5, 0.69, 2.0);
 137         np_mud            = NoiseParams(4,   2.0,  v3f(200.0, 200.0, 200.0), 91013,  3, 0.55, 2.0);
 138         np_beach          = NoiseParams(0,   1.0,  v3f(250.0, 250.0, 250.0), 59420,  3, 0.50, 2.0);
 139         np_biome          = NoiseParams(0,   1.0,  v3f(250.0, 250.0, 250.0), 9130,   3, 0.50, 2.0);
 140         np_cave           = NoiseParams(6,   6.0,  v3f(250.0, 250.0, 250.0), 34329,  3, 0.50, 2.0);
 141         np_humidity       = NoiseParams(0.5, 0.5,  v3f(500.0, 500.0, 500.0), 72384,  4, 0.66, 2.0);
 142         np_trees          = NoiseParams(0,   1.0,  v3f(125.0, 125.0, 125.0), 2,      4, 0.66, 2.0);
 143         np_apple_trees    = NoiseParams(0,   1.0,  v3f(100.0, 100.0, 100.0), 342902, 3, 0.45, 2.0);
 144 }
 145
 146
 147 void MapgenV6Params::readParams(Settings *settings)
 148 {
 149         settings->getFlagStrNoEx("mgv6_spflags", spflags, flagdesc_mapgen_v6);
 150         settings->getFloatNoEx("mgv6_freq_desert", freq_desert);
 151         settings->getFloatNoEx("mgv6_freq_beach",  freq_beach);
 152
 153         settings->getNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 154         settings->getNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 155         settings->getNoiseParams("mgv6_np_steepness",      np_steepness);
 156         settings->getNoiseParams("mgv6_np_height_select",  np_height_select);
 157         settings->getNoiseParams("mgv6_np_mud",            np_mud);
 158         settings->getNoiseParams("mgv6_np_beach",          np_beach);
 159         settings->getNoiseParams("mgv6_np_biome",          np_biome);
 160         settings->getNoiseParams("mgv6_np_cave",           np_cave);
 161         settings->getNoiseParams("mgv6_np_humidity",       np_humidity);
 162         settings->getNoiseParams("mgv6_np_trees",          np_trees);
 163         settings->getNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 164 }
 165
 166
 167 void MapgenV6Params::writeParams(Settings *settings)
 168 {
 169         settings->setFlagStr("mgv6_spflags", spflags, flagdesc_mapgen_v6, (u32)-1);
 170         settings->setFloat("mgv6_freq_desert", freq_desert);
 171         settings->setFloat("mgv6_freq_beach",  freq_beach);
 172
 173         settings->setNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 174         settings->setNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 175         settings->setNoiseParams("mgv6_np_steepness",      np_steepness);
 176         settings->setNoiseParams("mgv6_np_height_select",  np_height_select);
 177         settings->setNoiseParams("mgv6_np_mud",            np_mud);
 178         settings->setNoiseParams("mgv6_np_beach",          np_beach);
 179         settings->setNoiseParams("mgv6_np_biome",          np_biome);
 180         settings->setNoiseParams("mgv6_np_cave",           np_cave);
 181         settings->setNoiseParams("mgv6_np_humidity",       np_humidity);
 182         settings->setNoiseParams("mgv6_np_trees",          np_trees);
 183         settings->setNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 184 }
 185
 186
 187 //////////////////////// Some helper functions for the map generator
 188
 189
 190 // Returns Y one under area minimum if not found
 191 s16 MapgenV6::find_stone_level(v2s16 p2d)
 192 {
 193         v3s16 em = vm->m_area.getExtent();
 194         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 195         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 196         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 197         s16 y;
 198
 199         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 200                 MapNode &n = vm->m_data[i];
 201                 content_t c = n.getContent();
 202                 if (c != CONTENT_IGNORE && (
 203                         c == c_stone || c == c_desert_stone))
 204                         break;
 205
 206                 vm->m_area.add_y(em, i, -1);
 207         }
 208         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 209 }
 210
 211
 212 // Required by mapgen.h
 213 bool MapgenV6::block_is_underground(u64 seed, v3s16 blockpos)
 214 {
 215         /*s16 minimum_groundlevel = (s16)get_sector_minimum_ground_level(
 216                         seed, v2s16(blockpos.X, blockpos.Z));*/
 217         // Nah, this is just a heuristic, just return something
 218         s16 minimum_groundlevel = water_level;
 219
 220         if(blockpos.Y*MAP_BLOCKSIZE + MAP_BLOCKSIZE <= minimum_groundlevel)
 221                 return true;
 222         else
 223                 return false;
 224 }
 225
 226
 227 //////////////////////// Base terrain height functions
 228
 229 float MapgenV6::baseTerrainLevel(float terrain_base, float terrain_higher,
 230         float steepness, float height_select)
 231 {
 232         float base   = 1 + terrain_base;
 233         float higher = 1 + terrain_higher;
 234
 235         // Limit higher ground level to at least base
 236         if(higher < base)
 237                 higher = base;
 238
 239         // Steepness factor of cliffs
 240         float b = steepness;
 241         b = rangelim(b, 0.0, 1000.0);
 242         b = 5 * b * b * b * b * b * b * b;
 243         b = rangelim(b, 0.5, 1000.0);
 244
 245         // Values 1.5...100 give quite horrible looking slopes
 246         if (b > 1.5 && b < 100.0)
 247                 b = (b < 10.0) ? 1.5 : 100.0;
 248
 249         float a_off = -0.20; // Offset to more low
 250         float a = 0.5 + b * (a_off + height_select);
 251         a = rangelim(a, 0.0, 1.0); // Limit
 252
 253         return base * (1.0 - a) + higher * a;
 254 }
 255
 256
 257 float MapgenV6::baseTerrainLevelFromNoise(v2s16 p)
 258 {
 259         if (flags & MG_FLAT)
 260                 return water_level;
 261
 262         float terrain_base   = NoisePerlin2D_PO(&noise_terrain_base->np,
 263                                                         p.X, 0.5, p.Y, 0.5, seed);
 264         float terrain_higher = NoisePerlin2D_PO(&noise_terrain_higher->np,
 265                                                         p.X, 0.5, p.Y, 0.5, seed);
 266         float steepness      = NoisePerlin2D_PO(&noise_steepness->np,
 267                                                         p.X, 0.5, p.Y, 0.5, seed);
 268         float height_select  = NoisePerlin2D_PO(&noise_height_select->np,
 269                                                         p.X, 0.5, p.Y, 0.5, seed);
 270
 271         return baseTerrainLevel(terrain_base, terrain_higher,
 272                                                         steepness,    height_select);
 273 }
 274
 275
 276 float MapgenV6::baseTerrainLevelFromMap(v2s16 p)
 277 {
 278         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 279         return baseTerrainLevelFromMap(index);
 280 }
 281
 282
 283 float MapgenV6::baseTerrainLevelFromMap(int index)
 284 {
 285         if (flags & MG_FLAT)
 286                 return water_level;
 287
 288         float terrain_base   = noise_terrain_base->result[index];
 289         float terrain_higher = noise_terrain_higher->result[index];
 290         float steepness      = noise_steepness->result[index];
 291         float height_select  = noise_height_select->result[index];
 292
 293         return baseTerrainLevel(terrain_base, terrain_higher,
 294                                                         steepness,    height_select);
 295 }
 296
 297
 298 s16 MapgenV6::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision)
 299 {
 300         return baseTerrainLevelFromNoise(p2d) + AVERAGE_MUD_AMOUNT;
 301 }
 302
 303
 304 int MapgenV6::getGroundLevelAtPoint(v2s16 p)
 305 {
 306         return baseTerrainLevelFromNoise(p) + AVERAGE_MUD_AMOUNT;
 307 }
 308
 309
 310 //////////////////////// Noise functions
 311
 312 float MapgenV6::getMudAmount(v2s16 p)
 313 {
 314         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 315         return getMudAmount(index);
 316 }
 317
 318
 319 bool MapgenV6::getHaveBeach(v2s16 p)
 320 {
 321         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 322         return getHaveBeach(index);
 323 }
 324
 325
 326 BiomeV6Type MapgenV6::getBiome(v2s16 p)
 327 {
 328         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 329         return getBiome(index, p);
 330 }
 331
 332
 333 float MapgenV6::getHumidity(v2s16 p)
 334 {
 335         /*double noise = noise2d_perlin(
 336                 0.5+(float)p.X/500, 0.5+(float)p.Y/500,
 337                 seed+72384, 4, 0.66);
 338         noise = (noise + 1.0)/2.0;*/
 339
 340         float noise = NoisePerlin2D(np_humidity, p.X, p.Y, seed);
 341
 342         if (noise < 0.0)
 343                 noise = 0.0;
 344         if (noise > 1.0)
 345                 noise = 1.0;
 346         return noise;
 347 }
 348
 349
 350 float MapgenV6::getTreeAmount(v2s16 p)
 351 {
 352         /*double noise = noise2d_perlin(
 353                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 354                         seed+2, 4, 0.66);*/
 355
 356         float noise = NoisePerlin2D(np_trees, p.X, p.Y, seed);
 357         float zeroval = -0.39;
 358         if (noise < zeroval)
 359                 return 0;
 360         else
 361                 return 0.04 * (noise-zeroval) / (1.0-zeroval);
 362 }
 363
 364
 365 bool MapgenV6::getHaveAppleTree(v2s16 p)
 366 {
 367         /*is_apple_tree = noise2d_perlin(
 368                 0.5+(float)p.X/100, 0.5+(float)p.Z/100,
 369                 data->seed+342902, 3, 0.45) > 0.2;*/
 370
 371         float noise = NoisePerlin2D(np_apple_trees, p.X, p.Y, seed);
 372
 373         return noise > 0.2;
 374 }
 375
 376
 377 float MapgenV6::getMudAmount(int index)
 378 {
 379         if (flags & MG_FLAT)
 380                 return AVERAGE_MUD_AMOUNT;
 381
 382         /*return ((float)AVERAGE_MUD_AMOUNT + 2.0 * noise2d_perlin(
 383                         0.5+(float)p.X/200, 0.5+(float)p.Y/200,
 384                         seed+91013, 3, 0.55));*/
 385
 386         return noise_mud->result[index];
 387 }
 388
 389
 390 bool MapgenV6::getHaveBeach(int index)
 391 {
 392         // Determine whether to have sand here
 393         /*double sandnoise = noise2d_perlin(
 394                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 395                         seed+59420, 3, 0.50);*/
 396
 397         float sandnoise = noise_beach->result[index];
 398         return (sandnoise > freq_beach);
 399 }
 400
 401
 402 BiomeV6Type MapgenV6::getBiome(int index, v2s16 p)
 403 {
 404         // Just do something very simple as for now
 405         /*double d = noise2d_perlin(
 406                         0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
 407                         seed+9130, 3, 0.50);*/
 408
 409         float d = noise_biome->result[index];
 410         if (d > freq_desert)
 411                 return BT_DESERT;
 412
 413         if ((spflags & MGV6_BIOMEBLEND) &&
 414                 (d > freq_desert - 0.10) &&
 415                 ((noise2d(p.X, p.Y, seed) + 1.0) > (freq_desert - d) * 20.0))
 416                 return BT_DESERT;
 417
 418         return BT_NORMAL;
 419 }
 420
 421
 422 u32 MapgenV6::get_blockseed(u64 seed, v3s16 p)
 423 {
 424         s32 x=p.X, y=p.Y, z=p.Z;
 425         return (u32)(seed%0x100000000ULL) + z*38134234 + y*42123 + x*23;
 426 }
 427
 428
 429 //////////////////////// Map generator
 430
 431 void MapgenV6::makeChunk(BlockMakeData *data)
 432 {
 433         // Pre-conditions
 434         assert(data->vmanip);
 435         assert(data->nodedef);
 436         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 437                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 438                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 439         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 440                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 441                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 442
 443         this->generating = true;
 444         this->vm   = data->vmanip;
 445         this->ndef = data->nodedef;
 446
 447         // Hack: use minimum block coords for old code that assumes a single block
 448         v3s16 blockpos_min = data->blockpos_min;
 449         v3s16 blockpos_max = data->blockpos_max;
 450
 451         // Area of central chunk
 452         node_min = blockpos_min*MAP_BLOCKSIZE;
 453         node_max = (blockpos_max+v3s16(1,1,1))*MAP_BLOCKSIZE-v3s16(1,1,1);
 454
 455         // Full allocated area
 456         full_node_min = (blockpos_min-1)*MAP_BLOCKSIZE;
 457         full_node_max = (blockpos_max+2)*MAP_BLOCKSIZE-v3s16(1,1,1);
 458
 459         central_area_size = node_max - node_min + v3s16(1,1,1);
 460         assert(central_area_size.X == central_area_size.Z);
 461
 462         int volume_blocks = (blockpos_max.X - blockpos_min.X + 1)
 463                                           * (blockpos_max.Y - blockpos_min.Y + 1)
 464                                           * (blockpos_max.Z - blockpos_max.Z + 1);
 465
 466         volume_nodes = volume_blocks *
 467                 MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 468
 469         // Create a block-specific seed
 470         blockseed = get_blockseed(data->seed, full_node_min);
 471
 472         // Make some noise
 473         calculateNoise();
 474
 475         // Maximum height of the stone surface and obstacles.
 476         // This is used to guide the cave generation
 477         s16 stone_surface_max_y;
 478
 479         // Generate general ground level to full area
 480         stone_surface_max_y = generateGround();
 481
 482         generateExperimental();
 483
 484         const s16 max_spread_amount = MAP_BLOCKSIZE;
 485         // Limit dirt flow area by 1 because mud is flown into neighbors.
 486         s16 mudflow_minpos = -max_spread_amount + 1;
 487         s16 mudflow_maxpos = central_area_size.X + max_spread_amount - 2;
 488
 489         // Loop this part, it will make stuff look older and newer nicely
 490         const u32 age_loops = 2;
 491         for (u32 i_age = 0; i_age < age_loops; i_age++) { // Aging loop
 492                 // Make caves (this code is relatively horrible)
 493                 if (flags & MG_CAVES)
 494                         generateCaves(stone_surface_max_y);
 495
 496                 // Add mud to the central chunk
 497                 addMud();
 498
 499                 // Add blobs of dirt and gravel underground
 500                 addDirtGravelBlobs();
 501
 502                 // Flow mud away from steep edges
 503                 if (spflags & MGV6_MUDFLOW)
 504                         flowMud(mudflow_minpos, mudflow_maxpos);
 505
 506         }
 507
 508         // Create heightmap after mudflow
 509         updateHeightmap(node_min, node_max);
 510
 511         // Add dungeons
 512         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 513                 DungeonParams dp;
 514
 515                 dp.np_rarity  = nparams_dungeon_rarity;
 516                 dp.np_density = nparams_dungeon_density;
 517                 dp.np_wetness = nparams_dungeon_wetness;
 518                 dp.c_water = c_water_source;
 519                 if (getBiome(0, v2s16(node_min.X, node_min.Z)) == BT_NORMAL) {
 520                         dp.c_cobble  = c_cobble;
 521                         dp.c_moss    = c_mossycobble;
 522                         dp.c_stair   = c_stair_cobble;
 523
 524                         dp.diagonal_dirs = false;
 525                         dp.mossratio  = 3.0;
 526                         dp.holesize   = v3s16(1, 2, 1);
 527                         dp.roomsize   = v3s16(0, 0, 0);
 528                         dp.notifytype = GENNOTIFY_DUNGEON;
 529                 } else {
 530                         dp.c_cobble  = c_sandbrick;
 531                         dp.c_moss    = c_sandbrick; // should make this 'cracked sandstone' later
 532                         dp.c_stair   = c_stair_sandstone;
 533
 534                         dp.diagonal_dirs = true;
 535                         dp.mossratio  = 0.0;
 536                         dp.holesize   = v3s16(2, 3, 2);
 537                         dp.roomsize   = v3s16(2, 5, 2);
 538                         dp.notifytype = GENNOTIFY_TEMPLE;
 539                 }
 540
 541                 DungeonGen dgen(this, &dp);
 542                 dgen.generate(blockseed, full_node_min, full_node_max);
 543         }
 544
 545         // Add top and bottom side of water to transforming_liquid queue
 546         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 547
 548         // Grow grass
 549         growGrass();
 550
 551         // Generate some trees, and add grass, if a jungle
 552         if (flags & MG_TREES)
 553                 placeTreesAndJungleGrass();
 554
 555         // Generate the registered decorations
 556         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 557
 558         // Generate the registered ores
 559         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 560
 561         // Calculate lighting
 562         if (flags & MG_LIGHT)
 563                 calcLighting(node_min, node_max);
 564
 565         this->generating = false;
 566 }
 567
 568
 569 void MapgenV6::calculateNoise()
 570 {
 571         int x = node_min.X;
 572         int z = node_min.Z;
 573
 574         if (!(flags & MG_FLAT)) {
 575                 noise_terrain_base->perlinMap2D_PO(x, 0.5, z, 0.5);
 576                 noise_terrain_higher->perlinMap2D_PO(x, 0.5, z, 0.5);
 577                 noise_steepness->perlinMap2D_PO(x, 0.5, z, 0.5);
 578                 noise_height_select->perlinMap2D_PO(x, 0.5, z, 0.5);
 579                 noise_mud->perlinMap2D_PO(x, 0.5, z, 0.5);
 580         }
 581
 582         noise_beach->perlinMap2D_PO(x, 0.2, z, 0.7);
 583         noise_biome->perlinMap2D_PO(x, 0.6, z, 0.2);
 584 }
 585
 586
 587 int MapgenV6::generateGround()
 588 {
 589         //TimeTaker timer1("Generating ground level");
 590         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 591         MapNode n_stone(c_stone), n_desert_stone(c_desert_stone);
 592         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 593         u32 index = 0;
 594
 595         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 596         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 597                 // Surface height
 598                 s16 surface_y = (s16)baseTerrainLevelFromMap(index);
 599
 600                 // Log it
 601                 if (surface_y > stone_surface_max_y)
 602                         stone_surface_max_y = surface_y;
 603
 604                 BiomeV6Type bt = getBiome(index, v2s16(x, z));
 605
 606                 // Fill ground with stone
 607                 v3s16 em = vm->m_area.getExtent();
 608                 u32 i = vm->m_area.index(x, node_min.Y, z);
 609                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 610                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 611                                 if (y <= surface_y) {
 612                                         vm->m_data[i] = (y > water_level && bt == BT_DESERT) ?
 613                                                 n_desert_stone : n_stone;
 614                                 } else if (y <= water_level) {
 615                                         vm->m_data[i] = n_water_source;
 616                                 } else {
 617                                         vm->m_data[i] = n_air;
 618                                 }
 619                         }
 620                         vm->m_area.add_y(em, i, 1);
 621                 }
 622         }
 623
 624         return stone_surface_max_y;
 625 }
 626
 627
 628 void MapgenV6::addMud()
 629 {
 630         // 15ms @cs=8
 631         //TimeTaker timer1("add mud");
 632         MapNode n_dirt(c_dirt), n_gravel(c_gravel);
 633         MapNode n_sand(c_sand), n_desert_sand(c_desert_sand);
 634         MapNode addnode;
 635
 636         u32 index = 0;
 637         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 638         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 639                 // Randomize mud amount
 640                 s16 mud_add_amount = getMudAmount(index) / 2.0 + 0.5;
 641
 642                 // Find ground level
 643                 s16 surface_y = find_stone_level(v2s16(x, z)); /////////////////optimize this!
 644
 645                 // Handle area not found
 646                 if (surface_y == vm->m_area.MinEdge.Y - 1)
 647                         continue;
 648
 649                 BiomeV6Type bt = getBiome(index, v2s16(x, z));
 650                 addnode = (bt == BT_DESERT) ? n_desert_sand : n_dirt;
 651
 652                 if (bt == BT_DESERT && surface_y + mud_add_amount <= water_level + 1) {
 653                         addnode = n_sand;
 654                 } else if (mud_add_amount <= 0) {
 655                         mud_add_amount = 1 - mud_add_amount;
 656                         addnode = n_gravel;
 657                 } else if (bt == BT_NORMAL && getHaveBeach(index) &&
 658                                 surface_y + mud_add_amount <= water_level + 2) {
 659                         addnode = n_sand;
 660                 }
 661
 662                 if (bt == BT_DESERT && surface_y > 20)
 663                         mud_add_amount = MYMAX(0, mud_add_amount - (surface_y - 20) / 5);
 664
 665                 // If topmost node is grass, change it to mud.  It might be if it was
 666                 // flown to there from a neighboring chunk and then converted.
 667                 u32 i = vm->m_area.index(x, surface_y, z);
 668                 if (vm->m_data[i].getContent() == c_dirt_with_grass)
 669                         vm->m_data[i] = n_dirt;
 670
 671                 // Add mud on ground
 672                 s16 mudcount = 0;
 673                 v3s16 em = vm->m_area.getExtent();
 674                 s16 y_start = surface_y + 1;
 675                 i = vm->m_area.index(x, y_start, z);
 676                 for (s16 y = y_start; y <= node_max.Y; y++) {
 677                         if (mudcount >= mud_add_amount)
 678                                 break;
 679
 680                         vm->m_data[i] = addnode;
 681                         mudcount++;
 682
 683                         vm->m_area.add_y(em, i, 1);
 684                 }
 685         }
 686 }
 687
 688
 689 void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos)
 690 {
 691         // 340ms @cs=8
 692         TimeTaker timer1("flow mud");
 693
 694         // Iterate a few times
 695         for(s16 k = 0; k < 3; k++) {
 696                 for (s16 z = mudflow_minpos; z <= mudflow_maxpos; z++)
 697                 for (s16 x = mudflow_minpos; x <= mudflow_maxpos; x++) {
 698                         // Invert coordinates every 2nd iteration
 699                         if (k % 2 == 0) {
 700                                 x = mudflow_maxpos - (x - mudflow_minpos);
 701                                 z = mudflow_maxpos - (z - mudflow_minpos);
 702                         }
 703
 704                         // Node position in 2d
 705                         v2s16 p2d = v2s16(node_min.X, node_min.Z) + v2s16(x, z);
 706
 707                         v3s16 em = vm->m_area.getExtent();
 708                         u32 i = vm->m_area.index(p2d.X, node_max.Y, p2d.Y);
 709                         s16 y = node_max.Y;
 710
 711                         while(y >= node_min.Y)
 712                         {
 713
 714                         for(;; y--)
 715                         {
 716                                 MapNode *n = NULL;
 717                                 // Find mud
 718                                 for(; y >= node_min.Y; y--) {
 719                                         n = &vm->m_data[i];
 720                                         if (n->getContent() == c_dirt ||
 721                                                 n->getContent() == c_dirt_with_grass ||
 722                                                 n->getContent() == c_gravel)
 723                                                 break;
 724
 725                                         vm->m_area.add_y(em, i, -1);
 726                                 }
 727
 728                                 // Stop if out of area
 729                                 //if(vmanip.m_area.contains(i) == false)
 730                                 if (y < node_min.Y)
 731                                         break;
 732
 733                                 if (n->getContent() == c_dirt ||
 734                                         n->getContent() == c_dirt_with_grass)
 735                                 {
 736                                         // Make it exactly mud
 737                                         n->setContent(c_dirt);
 738
 739                                         // Don't flow it if the stuff under it is not mud
 740                                         {
 741                                                 u32 i2 = i;
 742                                                 vm->m_area.add_y(em, i2, -1);
 743                                                 // Cancel if out of area
 744                                                 if(vm->m_area.contains(i2) == false)
 745                                                         continue;
 746                                                 MapNode *n2 = &vm->m_data[i2];
 747                                                 if (n2->getContent() != c_dirt &&
 748                                                         n2->getContent() != c_dirt_with_grass)
 749                                                         continue;
 750                                         }
 751                                 }
 752
 753                                 v3s16 dirs4[4] = {
 754                                         v3s16(0,0,1), // back
 755                                         v3s16(1,0,0), // right
 756                                         v3s16(0,0,-1), // front
 757                                         v3s16(-1,0,0), // left
 758                                 };
 759
 760                                 // Check that upper is air or doesn't exist.
 761                                 // Cancel dropping if upper keeps it in place
 762                                 u32 i3 = i;
 763                                 vm->m_area.add_y(em, i3, 1);
 764                                 if (vm->m_area.contains(i3) == true &&
 765                                         ndef->get(vm->m_data[i3]).walkable)
 766                                         continue;
 767
 768                                 // Drop mud on side
 769                                 for(u32 di=0; di<4; di++) {
 770                                         v3s16 dirp = dirs4[di];
 771                                         u32 i2 = i;
 772                                         // Move to side
 773                                         vm->m_area.add_p(em, i2, dirp);
 774                                         // Fail if out of area
 775                                         if (vm->m_area.contains(i2) == false)
 776                                                 continue;
 777                                         // Check that side is air
 778                                         MapNode *n2 = &vm->m_data[i2];
 779                                         if (ndef->get(*n2).walkable)
 780                                                 continue;
 781                                         // Check that under side is air
 782                                         vm->m_area.add_y(em, i2, -1);
 783                                         if (vm->m_area.contains(i2) == false)
 784                                                 continue;
 785                                         n2 = &vm->m_data[i2];
 786                                         if (ndef->get(*n2).walkable)
 787                                                 continue;
 788                                         // Loop further down until not air
 789                                         bool dropped_to_unknown = false;
 790                                         do {
 791                                                 vm->m_area.add_y(em, i2, -1);
 792                                                 n2 = &vm->m_data[i2];
 793                                                 // if out of known area
 794                                                 if(vm->m_area.contains(i2) == false ||
 795                                                         n2->getContent() == CONTENT_IGNORE) {
 796                                                         dropped_to_unknown = true;
 797                                                         break;
 798                                                 }
 799                                         } while (ndef->get(*n2).walkable == false);
 800                                         // Loop one up so that we're in air
 801                                         vm->m_area.add_y(em, i2, 1);
 802                                         n2 = &vm->m_data[i2];
 803
 804                                         bool old_is_water = (n->getContent() == c_water_source);
 805                                         // Move mud to new place
 806                                         if (!dropped_to_unknown) {
 807                                                 *n2 = *n;
 808                                                 // Set old place to be air (or water)
 809                                                 if(old_is_water)
 810                                                         *n = MapNode(c_water_source);
 811                                                 else
 812                                                         *n = MapNode(CONTENT_AIR);
 813                                         }
 814
 815                                         // Done
 816                                         break;
 817                                 }
 818                         }
 819                         }
 820                 }
 821         }
 822 }
 823
 824
 825 void MapgenV6::addDirtGravelBlobs()
 826 {
 827         if (getBiome(v2s16(node_min.X, node_min.Z)) != BT_NORMAL)
 828                 return;
 829
 830         PseudoRandom pr(blockseed + 983);
 831         for (int i = 0; i < volume_nodes/10/10/10; i++) {
 832                 bool only_fill_cave = (myrand_range(0,1) != 0);
 833                 v3s16 size(
 834                         pr.range(1, 8),
 835                         pr.range(1, 8),
 836                         pr.range(1, 8)
 837                 );
 838                 v3s16 p0(
 839                         pr.range(node_min.X, node_max.X) - size.X / 2,
 840                         pr.range(node_min.Y, node_max.Y) - size.Y / 2,
 841                         pr.range(node_min.Z, node_max.Z) - size.Z / 2
 842                 );
 843
 844                 MapNode n1((p0.Y > -32 && !pr.range(0, 1)) ? c_dirt : c_gravel);
 845                 for (int z1 = 0; z1 < size.Z; z1++)
 846                 for (int y1 = 0; y1 < size.Y; y1++)
 847                 for (int x1 = 0; x1 < size.X; x1++) {
 848                         v3s16 p = p0 + v3s16(x1, y1, z1);
 849                         u32 i = vm->m_area.index(p);
 850                         if (!vm->m_area.contains(i))
 851                                 continue;
 852                         // Cancel if not stone and not cave air
 853                         if (vm->m_data[i].getContent() != c_stone &&
 854                                 !(vm->m_flags[i] & VMANIP_FLAG_CAVE))
 855                                 continue;
 856                         if (only_fill_cave && !(vm->m_flags[i] & VMANIP_FLAG_CAVE))
 857                                 continue;
 858                         vm->m_data[i] = n1;
 859                 }
 860         }
 861 }
 862
 863
 864 void MapgenV6::placeTreesAndJungleGrass()
 865 {
 866         //TimeTaker t("placeTrees");
 867         if (node_max.Y < water_level)
 868                 return;
 869
 870         PseudoRandom grassrandom(blockseed + 53);
 871         content_t c_junglegrass = ndef->getId("mapgen_junglegrass");
 872         // if we don't have junglegrass, don't place cignore... that's bad
 873         if (c_junglegrass == CONTENT_IGNORE)
 874                 c_junglegrass = CONTENT_AIR;
 875         MapNode n_junglegrass(c_junglegrass);
 876         v3s16 em = vm->m_area.getExtent();
 877
 878         // Divide area into parts
 879         s16 div = 8;
 880         s16 sidelen = central_area_size.X / div;
 881         double area = sidelen * sidelen;
 882
 883         // N.B.  We must add jungle grass first, since tree leaves will
 884         // obstruct the ground, giving us a false ground level
 885         for (s16 z0 = 0; z0 < div; z0++)
 886         for (s16 x0 = 0; x0 < div; x0++) {
 887                 // Center position of part of division
 888                 v2s16 p2d_center(
 889                         node_min.X + sidelen / 2 + sidelen * x0,
 890                         node_min.Z + sidelen / 2 + sidelen * z0
 891                 );
 892                 // Minimum edge of part of division
 893                 v2s16 p2d_min(
 894                         node_min.X + sidelen * x0,
 895                         node_min.Z + sidelen * z0
 896                 );
 897                 // Maximum edge of part of division
 898                 v2s16 p2d_max(
 899                         node_min.X + sidelen + sidelen * x0 - 1,
 900                         node_min.Z + sidelen + sidelen * z0 - 1
 901                 );
 902
 903                 // Amount of trees, jungle area
 904                 u32 tree_count = area * getTreeAmount(p2d_center);
 905
 906                 float humidity;
 907                 bool is_jungle = false;
 908                 if (spflags & MGV6_JUNGLES) {
 909                         humidity = getHumidity(p2d_center);
 910                         if (humidity > 0.75) {
 911                                 is_jungle = true;
 912                                 tree_count *= 4;
 913                         }
 914                 }
 915
 916                 // Add jungle grass
 917                 if (is_jungle) {
 918                         u32 grass_count = 5 * humidity * tree_count;
 919                         for (u32 i = 0; i < grass_count; i++) {
 920                                 s16 x = grassrandom.range(p2d_min.X, p2d_max.X);
 921                                 s16 z = grassrandom.range(p2d_min.Y, p2d_max.Y);
 922
 923                                 s16 y = findGroundLevelFull(v2s16(x, z)); ////////////////optimize this!
 924                                 if (y < water_level || y < node_min.Y || y > node_max.Y)
 925                                         continue;
 926
 927                                 u32 vi = vm->m_area.index(x, y, z);
 928                                 // place on dirt_with_grass, since we know it is exposed to sunlight
 929                                 if (vm->m_data[vi].getContent() == c_dirt_with_grass) {
 930                                         vm->m_area.add_y(em, vi, 1);
 931                                         vm->m_data[vi] = n_junglegrass;
 932                                 }
 933                         }
 934                 }
 935
 936                 // Put trees in random places on part of division
 937                 for (u32 i = 0; i < tree_count; i++) {
 938                         s16 x = myrand_range(p2d_min.X, p2d_max.X);
 939                         s16 z = myrand_range(p2d_min.Y, p2d_max.Y);
 940                         s16 y = findGroundLevelFull(v2s16(x, z)); ////////////////////optimize this!
 941                         // Don't make a tree under water level
 942                         // Don't make a tree so high that it doesn't fit
 943                         if(y < water_level || y > node_max.Y - 6)
 944                                 continue;
 945
 946                         v3s16 p(x,y,z);
 947                         // Trees grow only on mud and grass
 948                         {
 949                                 u32 i = vm->m_area.index(p);
 950                                 MapNode *n = &vm->m_data[i];
 951                                 if (n->getContent() != c_dirt &&
 952                                         n->getContent() != c_dirt_with_grass)
 953                                         continue;
 954                         }
 955                         p.Y++;
 956
 957                         // Make a tree
 958                         if (is_jungle) {
 959                                 treegen::make_jungletree(*vm, p, ndef, myrand());
 960                         } else {
 961                                 bool is_apple_tree = (myrand_range(0, 3) == 0) &&
 962                                                                                 getHaveAppleTree(v2s16(x, z));
 963                                 treegen::make_tree(*vm, p, is_apple_tree, ndef, myrand());
 964                         }
 965                 }
 966         }
 967         //printf("placeTreesAndJungleGrass: %dms\n", t.stop());
 968 }
 969
 970
 971 void MapgenV6::growGrass()
 972 {
 973         for (s16 z = full_node_min.Z; z <= full_node_max.Z; z++)
 974         for (s16 x = full_node_min.X; x <= full_node_max.X; x++) {
 975                 // Find the lowest surface to which enough light ends up to make
 976                 // grass grow.  Basically just wait until not air and not leaves.
 977                 s16 surface_y = 0;
 978                 {
 979                         v3s16 em = vm->m_area.getExtent();
 980                         u32 i = vm->m_area.index(x, node_max.Y, z);
 981                         s16 y;
 982                         // Go to ground level
 983                         for (y = node_max.Y; y >= full_node_min.Y; y--) {
 984                                 MapNode &n = vm->m_data[i];
 985                                 if (ndef->get(n).param_type != CPT_LIGHT ||
 986                                         ndef->get(n).liquid_type != LIQUID_NONE)
 987                                         break;
 988                                 vm->m_area.add_y(em, i, -1);
 989                         }
 990                         surface_y = (y >= full_node_min.Y) ? y : full_node_min.Y;
 991                 }
 992
 993                 u32 i = vm->m_area.index(x, surface_y, z);
 994                 MapNode *n = &vm->m_data[i];
 995                 if (n->getContent() == c_dirt && surface_y >= water_level - 20)
 996                         n->setContent(c_dirt_with_grass);
 997         }
 998 }
 999
1000
1001 void MapgenV6::generateCaves(int max_stone_y)
1002 {
1003         float cave_amount = NoisePerlin2D(np_cave, node_min.X, node_min.Y, seed);
1004         int volume_nodes = (node_max.X - node_min.X + 1) *
1005                                            (node_max.Y - node_min.Y + 1) * MAP_BLOCKSIZE;
1006         cave_amount = MYMAX(0.0, cave_amount);
1007         u32 caves_count = cave_amount * volume_nodes / 50000;
1008         u32 bruises_count = 1;
1009         PseudoRandom ps(blockseed + 21343);
1010         PseudoRandom ps2(blockseed + 1032);
1011
1012         if (ps.range(1, 6) == 1)
1013                 bruises_count = ps.range(0, ps.range(0, 2));
1014
1015         if (getBiome(v2s16(node_min.X, node_min.Z)) == BT_DESERT) {
1016                 caves_count   /= 3;
1017                 bruises_count /= 3;
1018         }
1019
1020         for (u32 i = 0; i < caves_count + bruises_count; i++) {
1021                 bool large_cave = (i >= caves_count);
1022                 CaveV6 cave(this, &ps, &ps2, large_cave);
1023
1024                 cave.makeCave(node_min, node_max, max_stone_y);
1025         }
1026 }