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