src/mapgen_fractal.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2010-2015 paramat, Matt Gregory
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21
  22 #include "mapgen.h"
  23 #include "voxel.h"
  24 #include "noise.h"
  25 #include "mapblock.h"
  26 #include "mapnode.h"
  27 #include "map.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "voxelalgorithms.h"
  31 #include "profiler.h" // For TimeTaker
  32 #include "settings.h" // For g_settings
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.h"
  36 #include "treegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_fractal.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_fractal[] = {
  44         {"julia", MGFRACTAL_JULIA},
  45         {NULL,    0}
  46 };
  47
  48 ///////////////////////////////////////////////////////////////////////////////////////
  49
  50
  51 MapgenFractal::MapgenFractal(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  52         : Mapgen(mapgenid, params, emerge)
  53 {
  54         this->m_emerge = emerge;
  55         this->bmgr     = emerge->biomemgr;
  56
  57         //// amount of elements to skip for the next index
  58         //// for noise/height/biome maps (not vmanip)
  59         this->ystride = csize.X;
  60         this->zstride = csize.X * (csize.Y + 2);
  61
  62         this->biomemap  = new u8[csize.X * csize.Z];
  63         this->heightmap = new s16[csize.X * csize.Z];
  64         this->heatmap   = NULL;
  65         this->humidmap  = NULL;
  66
  67         MapgenFractalParams *sp = (MapgenFractalParams *)params->sparams;
  68         this->spflags = sp->spflags;
  69
  70         this->formula    = sp->formula;
  71         this->iterations = sp->iterations;
  72         this->scale      = sp->scale;
  73         this->offset     = sp->offset;
  74         this->slice_w    = sp->slice_w;
  75
  76         this->julia_x = sp->julia_x;
  77         this->julia_y = sp->julia_y;
  78         this->julia_z = sp->julia_z;
  79         this->julia_w = sp->julia_w;
  80
  81         //// 2D terrain noise
  82         noise_seabed       = new Noise(&sp->np_seabed, seed, csize.X, csize.Z);
  83         noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
  84
  85         //// 3D terrain noise
  86         noise_cave1 = new Noise(&sp->np_cave1, seed, csize.X, csize.Y + 2, csize.Z);
  87         noise_cave2 = new Noise(&sp->np_cave2, seed, csize.X, csize.Y + 2, csize.Z);
  88
  89         //// Biome noise
  90         noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
  91         noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
  92         noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
  93         noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
  94
  95         //// Resolve nodes to be used
  96         INodeDefManager *ndef = emerge->ndef;
  97
  98         c_stone                = ndef->getId("mapgen_stone");
  99         c_water_source         = ndef->getId("mapgen_water_source");
 100         c_lava_source          = ndef->getId("mapgen_lava_source");
 101         c_desert_stone         = ndef->getId("mapgen_desert_stone");
 102         c_ice                  = ndef->getId("mapgen_ice");
 103         c_sandstone            = ndef->getId("mapgen_sandstone");
 104
 105         c_cobble               = ndef->getId("mapgen_cobble");
 106         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 107         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 108         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 109         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 110
 111         if (c_ice == CONTENT_IGNORE)
 112                 c_ice = CONTENT_AIR;
 113         if (c_mossycobble == CONTENT_IGNORE)
 114                 c_mossycobble = c_cobble;
 115         if (c_stair_cobble == CONTENT_IGNORE)
 116                 c_stair_cobble = c_cobble;
 117         if (c_sandstonebrick == CONTENT_IGNORE)
 118                 c_sandstonebrick = c_sandstone;
 119         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 120                 c_stair_sandstonebrick = c_sandstone;
 121 }
 122
 123
 124 MapgenFractal::~MapgenFractal()
 125 {
 126         delete noise_seabed;
 127         delete noise_filler_depth;
 128         delete noise_cave1;
 129         delete noise_cave2;
 130
 131         delete noise_heat;
 132         delete noise_humidity;
 133         delete noise_heat_blend;
 134         delete noise_humidity_blend;
 135
 136         delete[] heightmap;
 137         delete[] biomemap;
 138 }
 139
 140
 141 MapgenFractalParams::MapgenFractalParams()
 142 {
 143         spflags = 0;
 144
 145         formula = 1;
 146         iterations = 9;
 147         scale = v3f(1024.0, 256.0, 1024.0);
 148         offset = v3f(1.75, 0.0, 0.0);
 149         slice_w = 0.0;
 150
 151         julia_x = 0.33;
 152         julia_y = 0.33;
 153         julia_z = 0.33;
 154         julia_w = 0.33;
 155
 156         np_seabed       = NoiseParams(-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0);
 157         np_filler_depth = NoiseParams(0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0);
 158         np_cave1        = NoiseParams(0,   12,  v3f(128, 128, 128), 52534, 4, 0.5, 2.0);
 159         np_cave2        = NoiseParams(0,   12,  v3f(128, 128, 128), 10325, 4, 0.5, 2.0);
 160 }
 161
 162
 163 void MapgenFractalParams::readParams(const Settings *settings)
 164 {
 165         settings->getFlagStrNoEx("mgfractal_spflags", spflags, flagdesc_mapgen_fractal);
 166
 167         settings->getU16NoEx("mgfractal_formula", formula);
 168         settings->getU16NoEx("mgfractal_iterations", iterations);
 169         settings->getV3FNoEx("mgfractal_scale", scale);
 170         settings->getV3FNoEx("mgfractal_offset", offset);
 171         settings->getFloatNoEx("mgfractal_slice_w", slice_w);
 172
 173         settings->getFloatNoEx("mgfractal_julia_x", julia_x);
 174         settings->getFloatNoEx("mgfractal_julia_y", julia_y);
 175         settings->getFloatNoEx("mgfractal_julia_z", julia_z);
 176         settings->getFloatNoEx("mgfractal_julia_w", julia_w);
 177
 178         settings->getNoiseParams("mgfractal_np_seabed", np_seabed);
 179         settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 180         settings->getNoiseParams("mgfractal_np_cave1", np_cave1);
 181         settings->getNoiseParams("mgfractal_np_cave2", np_cave2);
 182 }
 183
 184
 185 void MapgenFractalParams::writeParams(Settings *settings) const
 186 {
 187         settings->setFlagStr("mgfractal_spflags", spflags, flagdesc_mapgen_fractal, U32_MAX);
 188
 189         settings->setU16("mgfractal_formula", formula);
 190         settings->setU16("mgfractal_iterations", iterations);
 191         settings->setV3F("mgfractal_scale", scale);
 192         settings->setV3F("mgfractal_offset", offset);
 193         settings->setFloat("mgfractal_slice_w", slice_w);
 194
 195         settings->setFloat("mgfractal_julia_x", julia_x);
 196         settings->setFloat("mgfractal_julia_y", julia_y);
 197         settings->setFloat("mgfractal_julia_z", julia_z);
 198         settings->setFloat("mgfractal_julia_w", julia_w);
 199
 200         settings->setNoiseParams("mgfractal_np_seabed", np_seabed);
 201         settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 202         settings->setNoiseParams("mgfractal_np_cave1", np_cave1);
 203         settings->setNoiseParams("mgfractal_np_cave2", np_cave2);
 204 }
 205
 206
 207 /////////////////////////////////////////////////////////////////
 208
 209
 210 int MapgenFractal::getGroundLevelAtPoint(v2s16 p)
 211 {
 212         s16 search_start = 128;
 213         s16 search_end = -128;
 214
 215         for (s16 y = search_start; y >= search_end; y--) {
 216                 if (getFractalAtPoint(p.X, y, p.Y))
 217                         return y;
 218         }
 219
 220         return -MAX_MAP_GENERATION_LIMIT;
 221 }
 222
 223
 224 void MapgenFractal::makeChunk(BlockMakeData *data)
 225 {
 226         // Pre-conditions
 227         assert(data->vmanip);
 228         assert(data->nodedef);
 229         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 230                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 231                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 232         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 233                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 234                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 235
 236         this->generating = true;
 237         this->vm   = data->vmanip;
 238         this->ndef = data->nodedef;
 239         TimeTaker t("makeChunk");
 240
 241         v3s16 blockpos_min = data->blockpos_min;
 242         v3s16 blockpos_max = data->blockpos_max;
 243         node_min = blockpos_min * MAP_BLOCKSIZE;
 244         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 245         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 246         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 247
 248         blockseed = getBlockSeed2(full_node_min, seed);
 249
 250         // Make some noise
 251         calculateNoise();
 252
 253         // Generate base terrain, mountains, and ridges with initial heightmaps
 254         s16 stone_surface_max_y = generateTerrain();
 255
 256         // Create heightmap
 257         updateHeightmap(node_min, node_max);
 258
 259         // Create biomemap at heightmap surface
 260         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 261                 noise_humidity->result, heightmap, biomemap);
 262
 263         // Actually place the biome-specific nodes
 264         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 265
 266         if (flags & MG_CAVES)
 267                 generateCaves(stone_surface_max_y);
 268
 269         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 270                 DungeonParams dp;
 271
 272                 dp.np_rarity  = nparams_dungeon_rarity;
 273                 dp.np_density = nparams_dungeon_density;
 274                 dp.np_wetness = nparams_dungeon_wetness;
 275                 dp.c_water    = c_water_source;
 276                 if (stone_type == STONE) {
 277                         dp.c_cobble = c_cobble;
 278                         dp.c_moss   = c_mossycobble;
 279                         dp.c_stair  = c_stair_cobble;
 280
 281                         dp.diagonal_dirs = false;
 282                         dp.mossratio     = 3.0;
 283                         dp.holesize      = v3s16(1, 2, 1);
 284                         dp.roomsize      = v3s16(0, 0, 0);
 285                         dp.notifytype    = GENNOTIFY_DUNGEON;
 286                 } else if (stone_type == DESERT_STONE) {
 287                         dp.c_cobble = c_desert_stone;
 288                         dp.c_moss   = c_desert_stone;
 289                         dp.c_stair  = c_desert_stone;
 290
 291                         dp.diagonal_dirs = true;
 292                         dp.mossratio     = 0.0;
 293                         dp.holesize      = v3s16(2, 3, 2);
 294                         dp.roomsize      = v3s16(2, 5, 2);
 295                         dp.notifytype    = GENNOTIFY_TEMPLE;
 296                 } else if (stone_type == SANDSTONE) {
 297                         dp.c_cobble = c_sandstonebrick;
 298                         dp.c_moss   = c_sandstonebrick;
 299                         dp.c_stair  = c_sandstonebrick;
 300
 301                         dp.diagonal_dirs = false;
 302                         dp.mossratio     = 0.0;
 303                         dp.holesize      = v3s16(2, 2, 2);
 304                         dp.roomsize      = v3s16(2, 0, 2);
 305                         dp.notifytype    = GENNOTIFY_DUNGEON;
 306                 }
 307
 308                 DungeonGen dgen(this, &dp);
 309                 dgen.generate(blockseed, full_node_min, full_node_max);
 310         }
 311
 312         // Generate the registered decorations
 313         if (flags & MG_DECORATIONS)
 314                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 315
 316         // Generate the registered ores
 317         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 318
 319         // Sprinkle some dust on top after everything else was generated
 320         dustTopNodes();
 321
 322         printf("makeChunk: %dms\n", t.stop());
 323
 324         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 325
 326         if (flags & MG_LIGHT)
 327                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 328                         full_node_min, full_node_max);
 329
 330         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 331         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 332
 333         this->generating = false;
 334 }
 335
 336
 337 void MapgenFractal::calculateNoise()
 338 {
 339         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 340         int x = node_min.X;
 341         int y = node_min.Y - 1;
 342         int z = node_min.Z;
 343
 344         noise_seabed->perlinMap2D(x, z);
 345         noise_filler_depth->perlinMap2D(x, z);
 346
 347         if (flags & MG_CAVES) {
 348                 noise_cave1->perlinMap3D(x, y, z);
 349                 noise_cave2->perlinMap3D(x, y, z);
 350         }
 351
 352         noise_heat->perlinMap2D(x, z);
 353         noise_humidity->perlinMap2D(x, z);
 354         noise_heat_blend->perlinMap2D(x, z);
 355         noise_humidity_blend->perlinMap2D(x, z);
 356
 357         for (s32 i = 0; i < csize.X * csize.Z; i++) {
 358                 noise_heat->result[i] += noise_heat_blend->result[i];
 359                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 360         }
 361
 362         heatmap = noise_heat->result;
 363         humidmap = noise_humidity->result;
 364         //printf("calculateNoise: %dus\n", t.stop());
 365 }
 366
 367
 368 bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
 369 {
 370         float cx, cy, cz, cw, ox, oy, oz, ow;
 371
 372         if (spflags & MGFRACTAL_JULIA) {  // Julia set
 373                 cx = julia_x;
 374                 cy = julia_y;
 375                 cz = julia_z;
 376                 cw = julia_w;
 377                 ox = (float)x / scale.X - offset.X;
 378                 oy = (float)y / scale.Y - offset.Y;
 379                 oz = (float)z / scale.Z - offset.Z;
 380                 ow = slice_w;
 381         } else {  // Mandelbrot set
 382                 cx = (float)x / scale.X - offset.X;
 383                 cy = (float)y / scale.Y - offset.Y;
 384                 cz = (float)z / scale.Z - offset.Z;
 385                 cw = slice_w;
 386                 ox = 0.0f;
 387                 oy = 0.0f;
 388                 oz = 0.0f;
 389                 ow = 0.0f;
 390         }
 391
 392         for (u16 iter = 0; iter < iterations; iter++) {
 393                 float nx = 0.0f;
 394                 float ny = 0.0f;
 395                 float nz = 0.0f;
 396                 float nw = 0.0f;
 397
 398                 if (formula == 1) {  // 4D "Roundy" Mandelbrot Set
 399                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 400                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 401                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 402                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 403                 } else if (formula == 2) {  // 4D "Squarry" Mandelbrot Set
 404                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 405                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 406                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 407                         nw = 2.0f * (ox * ow - oy * oz) + cw;
 408                 } else if (formula == 3) {  // 4D "Mandy Cousin" Mandelbrot Set
 409                         nx = ox * ox - oy * oy - oz * oz + ow * ow + cx;
 410                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 411                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 412                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 413                 } else if (formula == 4) {  // 4D Mandelbrot Set Variation
 414                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 415                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 416                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 417                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 418                 }
 419
 420                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 421                         return false;
 422
 423                 ox = nx;
 424                 oy = ny;
 425                 oz = nz;
 426                 ow = nw;
 427         }
 428
 429         return true;
 430 }
 431
 432
 433 s16 MapgenFractal::generateTerrain()
 434 {
 435         MapNode n_air(CONTENT_AIR);
 436         MapNode n_stone(c_stone);
 437         MapNode n_water(c_water_source);
 438
 439         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 440         u32 index2d = 0;
 441
 442         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 443                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 444                         u32 vi = vm->m_area.index(node_min.X, y, z);
 445                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 446                                 if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 447                                         s16 seabed_height = noise_seabed->result[index2d];
 448
 449                                         if (y <= seabed_height || getFractalAtPoint(x, y, z)) {
 450                                                 vm->m_data[vi] = n_stone;
 451                                                 if (y > stone_surface_max_y)
 452                                                         stone_surface_max_y = y;
 453                                         } else if (y <= water_level) {
 454                                                 vm->m_data[vi] = n_water;
 455                                         } else {
 456                                                 vm->m_data[vi] = n_air;
 457                                         }
 458                                 }
 459                         }
 460                         index2d -= ystride;
 461                 }
 462                 index2d += ystride;
 463         }
 464
 465         return stone_surface_max_y;
 466 }
 467
 468
 469 MgStoneType MapgenFractal::generateBiomes(float *heat_map, float *humidity_map)
 470 {
 471         v3s16 em = vm->m_area.getExtent();
 472         u32 index = 0;
 473         MgStoneType stone_type = STONE;
 474
 475         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 476         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 477                 Biome *biome = NULL;
 478                 u16 depth_top = 0;
 479                 u16 base_filler = 0;
 480                 u16 depth_water_top = 0;
 481                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 482
 483                 // Check node at base of mapchunk above, either a node of a previously
 484                 // generated mapchunk or if not, a node of overgenerated base terrain.
 485                 content_t c_above = vm->m_data[vi + em.X].getContent();
 486                 bool air_above = c_above == CONTENT_AIR;
 487                 bool water_above = c_above == c_water_source;
 488
 489                 // If there is air or water above enable top/filler placement, otherwise force
 490                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 491                 u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
 492
 493
 494                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 495                         content_t c = vm->m_data[vi].getContent();
 496
 497                         // Biome is recalculated each time an upper surface is detected while
 498                         // working down a column. The selected biome then remains in effect for
 499                         // all nodes below until the next surface and biome recalculation.
 500                         // Biome is recalculated:
 501                         // 1. At the surface of stone below air or water.
 502                         // 2. At the surface of water below air.
 503                         // 3. When stone or water is detected but biome has not yet been calculated.
 504                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 505                                         (c == c_water_source && (air_above || !biome))) {
 506                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 507                                 depth_top = biome->depth_top;
 508                                 base_filler = MYMAX(depth_top + biome->depth_filler
 509                                         + noise_filler_depth->result[index], 0);
 510                                 depth_water_top = biome->depth_water_top;
 511
 512                                 // Detect stone type for dungeons during every biome calculation.
 513                                 // This is more efficient than detecting per-node and will not
 514                                 // miss any desert stone or sandstone biomes.
 515                                 if (biome->c_stone == c_desert_stone)
 516                                         stone_type = DESERT_STONE;
 517                                 else if (biome->c_stone == c_sandstone)
 518                                         stone_type = SANDSTONE;
 519                         }
 520
 521                         if (c == c_stone) {
 522                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 523
 524                                 // If the node below isn't solid, make this node stone, so that
 525                                 // any top/filler nodes above are structurally supported.
 526                                 // This is done by aborting the cycle of top/filler placement
 527                                 // immediately by forcing nplaced to stone level.
 528                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 529                                         nplaced = U16_MAX;
 530
 531                                 if (nplaced < depth_top) {
 532                                         vm->m_data[vi] = MapNode(biome->c_top);
 533                                         nplaced++;
 534                                 } else if (nplaced < base_filler) {
 535                                         vm->m_data[vi] = MapNode(biome->c_filler);
 536                                         nplaced++;
 537                                 } else {
 538                                         vm->m_data[vi] = MapNode(biome->c_stone);
 539                                 }
 540
 541                                 air_above = false;
 542                                 water_above = false;
 543                         } else if (c == c_water_source) {
 544                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 545                                                 biome->c_water_top : biome->c_water);
 546                                 nplaced = 0;  // Enable top/filler placement for next surface
 547                                 air_above = false;
 548                                 water_above = true;
 549                         } else if (c == CONTENT_AIR) {
 550                                 nplaced = 0;  // Enable top/filler placement for next surface
 551                                 air_above = true;
 552                                 water_above = false;
 553                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 554                                 nplaced = U16_MAX;  // Disable top/filler placement
 555                                 air_above = false;
 556                                 water_above = false;
 557                         }
 558
 559                         vm->m_area.add_y(em, vi, -1);
 560                 }
 561         }
 562
 563         return stone_type;
 564 }
 565
 566
 567 void MapgenFractal::dustTopNodes()
 568 {
 569         if (node_max.Y < water_level)
 570                 return;
 571
 572         v3s16 em = vm->m_area.getExtent();
 573         u32 index = 0;
 574
 575         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 576         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 577                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 578
 579                 if (biome->c_dust == CONTENT_IGNORE)
 580                         continue;
 581
 582                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 583                 content_t c_full_max = vm->m_data[vi].getContent();
 584                 s16 y_start;
 585
 586                 if (c_full_max == CONTENT_AIR) {
 587                         y_start = full_node_max.Y - 1;
 588                 } else if (c_full_max == CONTENT_IGNORE) {
 589                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 590                         content_t c_max = vm->m_data[vi].getContent();
 591
 592                         if (c_max == CONTENT_AIR)
 593                                 y_start = node_max.Y;
 594                         else
 595                                 continue;
 596                 } else {
 597                         continue;
 598                 }
 599
 600                 vi = vm->m_area.index(x, y_start, z);
 601                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 602                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 603                                 break;
 604
 605                         vm->m_area.add_y(em, vi, -1);
 606                 }
 607
 608                 content_t c = vm->m_data[vi].getContent();
 609                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 610                         vm->m_area.add_y(em, vi, 1);
 611                         vm->m_data[vi] = MapNode(biome->c_dust);
 612                 }
 613         }
 614 }
 615
 616
 617 void MapgenFractal::generateCaves(s16 max_stone_y)
 618 {
 619         if (max_stone_y >= node_min.Y) {
 620                 u32 index = 0;
 621
 622                 for (s16 z = node_min.Z; z <= node_max.Z; z++)
 623                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 624                         u32 vi = vm->m_area.index(node_min.X, y, z);
 625                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index++) {
 626                                 float d1 = contour(noise_cave1->result[index]);
 627                                 float d2 = contour(noise_cave2->result[index]);
 628                                 if (d1 * d2 > 0.4f) {
 629                                         content_t c = vm->m_data[vi].getContent();
 630                                         if (!ndef->get(c).is_ground_content || c == CONTENT_AIR)
 631                                                 continue;
 632
 633                                         vm->m_data[vi] = MapNode(CONTENT_AIR);
 634                                 }
 635                         }
 636                 }
 637         }
 638
 639         if (node_max.Y > MGFRACTAL_LARGE_CAVE_DEPTH)
 640                 return;
 641
 642         PseudoRandom ps(blockseed + 21343);
 643         u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
 644         for (u32 i = 0; i < bruises_count; i++) {
 645                 CaveV5 cave(this, &ps);
 646                 cave.makeCave(node_min, node_max, max_stone_y);
 647         }
 648 }