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         {NULL,    0}
  45 };
  46
  47 ///////////////////////////////////////////////////////////////////////////////////////
  48
  49
  50 MapgenFractal::MapgenFractal(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  51         : Mapgen(mapgenid, params, emerge)
  52 {
  53         this->m_emerge = emerge;
  54         this->bmgr     = emerge->biomemgr;
  55
  56         //// amount of elements to skip for the next index
  57         //// for noise/height/biome maps (not vmanip)
  58         this->ystride = csize.X;
  59         // 1-down overgeneration
  60         this->zstride_1d = csize.X * (csize.Y + 1);
  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->fractal    = sp->fractal;
  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         this->formula = fractal / 2 + fractal % 2;
  82         this->julia   = fractal % 2 == 0;
  83
  84         //// 2D terrain noise
  85         noise_seabed       = new Noise(&sp->np_seabed, seed, csize.X, csize.Z);
  86         noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
  87
  88         //// 3D terrain noise
  89         // 1-down overgeneraion
  90         noise_cave1 = new Noise(&sp->np_cave1, seed, csize.X, csize.Y + 1, csize.Z);
  91         noise_cave2 = new Noise(&sp->np_cave2, seed, csize.X, csize.Y + 1, csize.Z);
  92
  93         //// Biome noise
  94         noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
  95         noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
  96         noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
  97         noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
  98
  99         //// Resolve nodes to be used
 100         INodeDefManager *ndef = emerge->ndef;
 101
 102         c_stone                = ndef->getId("mapgen_stone");
 103         c_water_source         = ndef->getId("mapgen_water_source");
 104         c_lava_source          = ndef->getId("mapgen_lava_source");
 105         c_desert_stone         = ndef->getId("mapgen_desert_stone");
 106         c_ice                  = ndef->getId("mapgen_ice");
 107         c_sandstone            = ndef->getId("mapgen_sandstone");
 108
 109         c_cobble               = ndef->getId("mapgen_cobble");
 110         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 111         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 112         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 113         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 114
 115         if (c_ice == CONTENT_IGNORE)
 116                 c_ice = CONTENT_AIR;
 117         if (c_mossycobble == CONTENT_IGNORE)
 118                 c_mossycobble = c_cobble;
 119         if (c_stair_cobble == CONTENT_IGNORE)
 120                 c_stair_cobble = c_cobble;
 121         if (c_sandstonebrick == CONTENT_IGNORE)
 122                 c_sandstonebrick = c_sandstone;
 123         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 124                 c_stair_sandstonebrick = c_sandstone;
 125 }
 126
 127
 128 MapgenFractal::~MapgenFractal()
 129 {
 130         delete noise_seabed;
 131         delete noise_filler_depth;
 132         delete noise_cave1;
 133         delete noise_cave2;
 134
 135         delete noise_heat;
 136         delete noise_humidity;
 137         delete noise_heat_blend;
 138         delete noise_humidity_blend;
 139
 140         delete[] heightmap;
 141         delete[] biomemap;
 142 }
 143
 144
 145 MapgenFractalParams::MapgenFractalParams()
 146 {
 147         spflags = 0;
 148
 149         fractal = 1;
 150         iterations = 11;
 151         scale = v3f(4096.0, 1024.0, 4096.0);
 152         offset = v3f(1.79, 0.0, 0.0);
 153         slice_w = 0.0;
 154
 155         julia_x = 0.33;
 156         julia_y = 0.33;
 157         julia_z = 0.33;
 158         julia_w = 0.33;
 159
 160         np_seabed       = NoiseParams(-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0);
 161         np_filler_depth = NoiseParams(0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0);
 162         np_cave1        = NoiseParams(0,   12,  v3f(96,  96,  96),  52534, 4, 0.5, 2.0);
 163         np_cave2        = NoiseParams(0,   12,  v3f(96,  96,  96),  10325, 4, 0.5, 2.0);
 164 }
 165
 166
 167 void MapgenFractalParams::readParams(const Settings *settings)
 168 {
 169         settings->getFlagStrNoEx("mgfractal_spflags", spflags, flagdesc_mapgen_fractal);
 170
 171         settings->getU16NoEx("mgfractal_fractal", fractal);
 172         settings->getU16NoEx("mgfractal_iterations", iterations);
 173         settings->getV3FNoEx("mgfractal_scale", scale);
 174         settings->getV3FNoEx("mgfractal_offset", offset);
 175         settings->getFloatNoEx("mgfractal_slice_w", slice_w);
 176
 177         settings->getFloatNoEx("mgfractal_julia_x", julia_x);
 178         settings->getFloatNoEx("mgfractal_julia_y", julia_y);
 179         settings->getFloatNoEx("mgfractal_julia_z", julia_z);
 180         settings->getFloatNoEx("mgfractal_julia_w", julia_w);
 181
 182         settings->getNoiseParams("mgfractal_np_seabed", np_seabed);
 183         settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 184         settings->getNoiseParams("mgfractal_np_cave1", np_cave1);
 185         settings->getNoiseParams("mgfractal_np_cave2", np_cave2);
 186 }
 187
 188
 189 void MapgenFractalParams::writeParams(Settings *settings) const
 190 {
 191         settings->setFlagStr("mgfractal_spflags", spflags, flagdesc_mapgen_fractal, U32_MAX);
 192
 193         settings->setU16("mgfractal_fractal", fractal);
 194         settings->setU16("mgfractal_iterations", iterations);
 195         settings->setV3F("mgfractal_scale", scale);
 196         settings->setV3F("mgfractal_offset", offset);
 197         settings->setFloat("mgfractal_slice_w", slice_w);
 198
 199         settings->setFloat("mgfractal_julia_x", julia_x);
 200         settings->setFloat("mgfractal_julia_y", julia_y);
 201         settings->setFloat("mgfractal_julia_z", julia_z);
 202         settings->setFloat("mgfractal_julia_w", julia_w);
 203
 204         settings->setNoiseParams("mgfractal_np_seabed", np_seabed);
 205         settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 206         settings->setNoiseParams("mgfractal_np_cave1", np_cave1);
 207         settings->setNoiseParams("mgfractal_np_cave2", np_cave2);
 208 }
 209
 210
 211 /////////////////////////////////////////////////////////////////
 212
 213
 214 int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 215 {
 216         bool solid_below = false;  // Dry solid node is present below to spawn on
 217         u8 air_count = 0;  // Consecutive air nodes above the dry solid node
 218         s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
 219         // Seabed can rise above water_level or might be raised to create dry land
 220         s16 search_start = MYMAX(seabed_level, water_level + 1);
 221         if (seabed_level > water_level)
 222                 solid_below = true;
 223
 224         for (s16 y = search_start; y <= search_start + 128; y++) {
 225                 if (getFractalAtPoint(p.X, y, p.Y)) {  // Fractal node
 226                         solid_below = true;
 227                         air_count = 0;
 228                 } else if (solid_below) {  // Air above solid node
 229                         air_count++;
 230                         if (air_count == 2)
 231                                 return y - 2;
 232                 }
 233         }
 234
 235         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 236 }
 237
 238
 239 void MapgenFractal::makeChunk(BlockMakeData *data)
 240 {
 241         // Pre-conditions
 242         assert(data->vmanip);
 243         assert(data->nodedef);
 244         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 245                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 246                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 247         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 248                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 249                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 250
 251         this->generating = true;
 252         this->vm   = data->vmanip;
 253         this->ndef = data->nodedef;
 254         //TimeTaker t("makeChunk");
 255
 256         v3s16 blockpos_min = data->blockpos_min;
 257         v3s16 blockpos_max = data->blockpos_max;
 258         node_min = blockpos_min * MAP_BLOCKSIZE;
 259         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 260         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 261         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 262
 263         blockseed = getBlockSeed2(full_node_min, seed);
 264
 265         // Make some noise
 266         calculateNoise();
 267
 268         // Generate base terrain, mountains, and ridges with initial heightmaps
 269         s16 stone_surface_max_y = generateTerrain();
 270
 271         // Create heightmap
 272         updateHeightmap(node_min, node_max);
 273
 274         // Create biomemap at heightmap surface
 275         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 276                 noise_humidity->result, heightmap, biomemap);
 277
 278         // Actually place the biome-specific nodes
 279         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 280
 281         if (flags & MG_CAVES)
 282                 generateCaves(stone_surface_max_y);
 283
 284         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 285                 DungeonParams dp;
 286
 287                 dp.np_rarity  = nparams_dungeon_rarity;
 288                 dp.np_density = nparams_dungeon_density;
 289                 dp.np_wetness = nparams_dungeon_wetness;
 290                 dp.c_water    = c_water_source;
 291                 if (stone_type == STONE) {
 292                         dp.c_cobble = c_cobble;
 293                         dp.c_moss   = c_mossycobble;
 294                         dp.c_stair  = c_stair_cobble;
 295
 296                         dp.diagonal_dirs = false;
 297                         dp.mossratio     = 3.0;
 298                         dp.holesize      = v3s16(1, 2, 1);
 299                         dp.roomsize      = v3s16(0, 0, 0);
 300                         dp.notifytype    = GENNOTIFY_DUNGEON;
 301                 } else if (stone_type == DESERT_STONE) {
 302                         dp.c_cobble = c_desert_stone;
 303                         dp.c_moss   = c_desert_stone;
 304                         dp.c_stair  = c_desert_stone;
 305
 306                         dp.diagonal_dirs = true;
 307                         dp.mossratio     = 0.0;
 308                         dp.holesize      = v3s16(2, 3, 2);
 309                         dp.roomsize      = v3s16(2, 5, 2);
 310                         dp.notifytype    = GENNOTIFY_TEMPLE;
 311                 } else if (stone_type == SANDSTONE) {
 312                         dp.c_cobble = c_sandstonebrick;
 313                         dp.c_moss   = c_sandstonebrick;
 314                         dp.c_stair  = c_sandstonebrick;
 315
 316                         dp.diagonal_dirs = false;
 317                         dp.mossratio     = 0.0;
 318                         dp.holesize      = v3s16(2, 2, 2);
 319                         dp.roomsize      = v3s16(2, 0, 2);
 320                         dp.notifytype    = GENNOTIFY_DUNGEON;
 321                 }
 322
 323                 DungeonGen dgen(this, &dp);
 324                 dgen.generate(blockseed, full_node_min, full_node_max);
 325         }
 326
 327         // Generate the registered decorations
 328         if (flags & MG_DECORATIONS)
 329                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 330
 331         // Generate the registered ores
 332         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 333
 334         // Sprinkle some dust on top after everything else was generated
 335         dustTopNodes();
 336
 337         //printf("makeChunk: %dms\n", t.stop());
 338
 339         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 340
 341         if (flags & MG_LIGHT)
 342                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 343                         full_node_min, full_node_max);
 344
 345         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 346         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 347
 348         this->generating = false;
 349 }
 350
 351
 352 void MapgenFractal::calculateNoise()
 353 {
 354         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 355         s16 x = node_min.X;
 356         s16 z = node_min.Z;
 357
 358         noise_seabed->perlinMap2D(x, z);
 359
 360         // Cave noises are calculated in generateCaves()
 361         // only if solid terrain is present in mapchunk
 362
 363         noise_filler_depth->perlinMap2D(x, z);
 364         noise_heat->perlinMap2D(x, z);
 365         noise_humidity->perlinMap2D(x, z);
 366         noise_heat_blend->perlinMap2D(x, z);
 367         noise_humidity_blend->perlinMap2D(x, z);
 368
 369         for (s32 i = 0; i < csize.X * csize.Z; i++) {
 370                 noise_heat->result[i] += noise_heat_blend->result[i];
 371                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 372         }
 373
 374         heatmap = noise_heat->result;
 375         humidmap = noise_humidity->result;
 376         //printf("calculateNoise: %dus\n", t.stop());
 377 }
 378
 379
 380 bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
 381 {
 382         float cx, cy, cz, cw, ox, oy, oz, ow;
 383
 384         if (julia) {  // Julia set
 385                 cx = julia_x;
 386                 cy = julia_y;
 387                 cz = julia_z;
 388                 cw = julia_w;
 389                 ox = (float)x / scale.X - offset.X;
 390                 oy = (float)y / scale.Y - offset.Y;
 391                 oz = (float)z / scale.Z - offset.Z;
 392                 ow = slice_w;
 393         } else {  // Mandelbrot set
 394                 cx = (float)x / scale.X - offset.X;
 395                 cy = (float)y / scale.Y - offset.Y;
 396                 cz = (float)z / scale.Z - offset.Z;
 397                 cw = slice_w;
 398                 ox = 0.0f;
 399                 oy = 0.0f;
 400                 oz = 0.0f;
 401                 ow = 0.0f;
 402         }
 403
 404         float nx = 0.0f;
 405         float ny = 0.0f;
 406         float nz = 0.0f;
 407         float nw = 0.0f;
 408
 409         for (u16 iter = 0; iter < iterations; iter++) {
 410
 411                 if (formula == 1) {  // 4D "Roundy"
 412                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 413                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 414                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 415                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 416                 } else if (formula == 2) {  // 4D "Squarry"
 417                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 418                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 419                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 420                         nw = 2.0f * (ox * ow - oy * oz) + cw;
 421                 } else if (formula == 3) {  // 4D "Mandy Cousin"
 422                         nx = ox * ox - oy * oy - oz * oz + ow * ow + cx;
 423                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 424                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 425                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 426                 } else if (formula == 4) {  // 4D "Variation"
 427                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 428                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 429                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 430                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 431                 } else if (formula == 5) {  // 3D "Mandelbrot/Mandelbar"
 432                         nx = ox * ox - oy * oy - oz * oz + cx;
 433                         ny = 2.0f * ox * oy + cy;
 434                         nz = -2.0f * ox * oz + cz;
 435                 } else if (formula == 6) {  // 3D "Christmas Tree"
 436                         // Altering the formula here is necessary to avoid division by zero
 437                         if (fabs(oz) < 0.000000001f) {
 438                                 nx = ox * ox - oy * oy - oz * oz + cx;
 439                                 ny = 2.0f * oy * ox + cy;
 440                                 nz = 4.0f * oz * ox + cz;
 441                         } else {
 442                                 float a = (2.0f * ox) / (sqrt(oy * oy + oz * oz));
 443                                 nx = ox * ox - oy * oy - oz * oz + cx;
 444                                 ny = a * (oy * oy - oz * oz) + cy;
 445                                 nz = a * 2.0f * oy * oz + cz;
 446                         }
 447                 } else if (formula == 7) {  // 3D "Mandelbulb"
 448                         if (fabs(oy) < 0.000000001f) {
 449                                 nx = ox * ox - oz * oz + cx;
 450                                 ny = cy;
 451                                 nz = -2.0f * oz * sqrt(ox * ox) + cz;
 452                         } else {
 453                                 float a = 1.0f - (oz * oz) / (ox * ox + oy * oy);
 454                                 nx = (ox * ox - oy * oy) * a + cx;
 455                                 ny = 2.0f * ox * oy * a + cy;
 456                                 nz = -2.0f * oz * sqrt(ox * ox + oy * oy) + cz;
 457                         }
 458                 } else if (formula == 8) {  // 3D "Cosine Mandelbulb"
 459                         if (fabs(oy) < 0.000000001f) {
 460                                 nx = 2.0f * ox * oz + cx;
 461                                 ny = 4.0f * oy * oz + cy;
 462                                 nz = oz * oz - ox * ox - oy * oy + cz;
 463                         } else {
 464                                 float a = (2.0f * oz) / sqrt(ox * ox + oy * oy);
 465                                 nx = (ox * ox - oy * oy) * a + cx;
 466                                 ny = 2.0f * ox * oy * a + cy;
 467                                 nz = oz * oz - ox * ox - oy * oy + cz;
 468                         }
 469                 } else if (formula == 9) {  // 4D "Mandelbulb"
 470                         float rxy = sqrt(ox * ox + oy * oy);
 471                         float rxyz = sqrt(ox * ox + oy * oy + oz * oz);
 472                         if (fabs(ow) < 0.000000001f && fabs(oz) < 0.000000001f) {
 473                                 nx = (ox * ox - oy * oy) + cx;
 474                                 ny = 2.0f * ox * oy + cy;
 475                                 nz = -2.0f * rxy * oz + cz;
 476                                 nw = 2.0f * rxyz * ow + cw;
 477                         } else {
 478                                 float a = 1.0f - (ow * ow) / (rxyz * rxyz);
 479                                 float b = a * (1.0f - (oz * oz) / (rxy * rxy));
 480                                 nx = (ox * ox - oy * oy) * b + cx;
 481                                 ny = 2.0f * ox * oy * b + cy;
 482                                 nz = -2.0f * rxy * oz * a + cz;
 483                                 nw = 2.0f * rxyz * ow + cw;
 484                         }
 485                 }
 486
 487                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 488                         return false;
 489
 490                 ox = nx;
 491                 oy = ny;
 492                 oz = nz;
 493                 ow = nw;
 494         }
 495
 496         return true;
 497 }
 498
 499
 500 s16 MapgenFractal::generateTerrain()
 501 {
 502         MapNode n_air(CONTENT_AIR);
 503         MapNode n_stone(c_stone);
 504         MapNode n_water(c_water_source);
 505
 506         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 507         u32 index2d = 0;
 508
 509         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 510                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 511                         u32 vi = vm->m_area.index(node_min.X, y, z);
 512                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 513                                 if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 514                                         s16 seabed_height = noise_seabed->result[index2d];
 515
 516                                         if (y <= seabed_height || getFractalAtPoint(x, y, z)) {
 517                                                 vm->m_data[vi] = n_stone;
 518                                                 if (y > stone_surface_max_y)
 519                                                         stone_surface_max_y = y;
 520                                         } else if (y <= water_level) {
 521                                                 vm->m_data[vi] = n_water;
 522                                         } else {
 523                                                 vm->m_data[vi] = n_air;
 524                                         }
 525                                 }
 526                         }
 527                         index2d -= ystride;
 528                 }
 529                 index2d += ystride;
 530         }
 531
 532         return stone_surface_max_y;
 533 }
 534
 535
 536 MgStoneType MapgenFractal::generateBiomes(float *heat_map, float *humidity_map)
 537 {
 538         v3s16 em = vm->m_area.getExtent();
 539         u32 index = 0;
 540         MgStoneType stone_type = STONE;
 541
 542         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 543         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 544                 Biome *biome = NULL;
 545                 u16 depth_top = 0;
 546                 u16 base_filler = 0;
 547                 u16 depth_water_top = 0;
 548                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 549
 550                 // Check node at base of mapchunk above, either a node of a previously
 551                 // generated mapchunk or if not, a node of overgenerated base terrain.
 552                 content_t c_above = vm->m_data[vi + em.X].getContent();
 553                 bool air_above = c_above == CONTENT_AIR;
 554                 bool water_above = c_above == c_water_source;
 555
 556                 // If there is air or water above enable top/filler placement, otherwise force
 557                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 558                 u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
 559
 560
 561                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 562                         content_t c = vm->m_data[vi].getContent();
 563
 564                         // Biome is recalculated each time an upper surface is detected while
 565                         // working down a column. The selected biome then remains in effect for
 566                         // all nodes below until the next surface and biome recalculation.
 567                         // Biome is recalculated:
 568                         // 1. At the surface of stone below air or water.
 569                         // 2. At the surface of water below air.
 570                         // 3. When stone or water is detected but biome has not yet been calculated.
 571                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 572                                         (c == c_water_source && (air_above || !biome))) {
 573                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 574                                 depth_top = biome->depth_top;
 575                                 base_filler = MYMAX(depth_top + biome->depth_filler
 576                                         + noise_filler_depth->result[index], 0);
 577                                 depth_water_top = biome->depth_water_top;
 578
 579                                 // Detect stone type for dungeons during every biome calculation.
 580                                 // This is more efficient than detecting per-node and will not
 581                                 // miss any desert stone or sandstone biomes.
 582                                 if (biome->c_stone == c_desert_stone)
 583                                         stone_type = DESERT_STONE;
 584                                 else if (biome->c_stone == c_sandstone)
 585                                         stone_type = SANDSTONE;
 586                         }
 587
 588                         if (c == c_stone) {
 589                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 590
 591                                 // If the node below isn't solid, make this node stone, so that
 592                                 // any top/filler nodes above are structurally supported.
 593                                 // This is done by aborting the cycle of top/filler placement
 594                                 // immediately by forcing nplaced to stone level.
 595                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 596                                         nplaced = U16_MAX;
 597
 598                                 if (nplaced < depth_top) {
 599                                         vm->m_data[vi] = MapNode(biome->c_top);
 600                                         nplaced++;
 601                                 } else if (nplaced < base_filler) {
 602                                         vm->m_data[vi] = MapNode(biome->c_filler);
 603                                         nplaced++;
 604                                 } else {
 605                                         vm->m_data[vi] = MapNode(biome->c_stone);
 606                                 }
 607
 608                                 air_above = false;
 609                                 water_above = false;
 610                         } else if (c == c_water_source) {
 611                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 612                                                 biome->c_water_top : biome->c_water);
 613                                 nplaced = 0;  // Enable top/filler placement for next surface
 614                                 air_above = false;
 615                                 water_above = true;
 616                         } else if (c == CONTENT_AIR) {
 617                                 nplaced = 0;  // Enable top/filler placement for next surface
 618                                 air_above = true;
 619                                 water_above = false;
 620                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 621                                 nplaced = U16_MAX;  // Disable top/filler placement
 622                                 air_above = false;
 623                                 water_above = false;
 624                         }
 625
 626                         vm->m_area.add_y(em, vi, -1);
 627                 }
 628         }
 629
 630         return stone_type;
 631 }
 632
 633
 634 void MapgenFractal::dustTopNodes()
 635 {
 636         if (node_max.Y < water_level)
 637                 return;
 638
 639         v3s16 em = vm->m_area.getExtent();
 640         u32 index = 0;
 641
 642         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 643         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 644                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 645
 646                 if (biome->c_dust == CONTENT_IGNORE)
 647                         continue;
 648
 649                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 650                 content_t c_full_max = vm->m_data[vi].getContent();
 651                 s16 y_start;
 652
 653                 if (c_full_max == CONTENT_AIR) {
 654                         y_start = full_node_max.Y - 1;
 655                 } else if (c_full_max == CONTENT_IGNORE) {
 656                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 657                         content_t c_max = vm->m_data[vi].getContent();
 658
 659                         if (c_max == CONTENT_AIR)
 660                                 y_start = node_max.Y;
 661                         else
 662                                 continue;
 663                 } else {
 664                         continue;
 665                 }
 666
 667                 vi = vm->m_area.index(x, y_start, z);
 668                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 669                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 670                                 break;
 671
 672                         vm->m_area.add_y(em, vi, -1);
 673                 }
 674
 675                 content_t c = vm->m_data[vi].getContent();
 676                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 677                         vm->m_area.add_y(em, vi, 1);
 678                         vm->m_data[vi] = MapNode(biome->c_dust);
 679                 }
 680         }
 681 }
 682
 683
 684 void MapgenFractal::generateCaves(s16 max_stone_y)
 685 {
 686         if (max_stone_y < node_min.Y)
 687                 return;
 688
 689         noise_cave1->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 690         noise_cave2->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 691
 692         v3s16 em = vm->m_area.getExtent();
 693         u32 index2d = 0;
 694
 695         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 696         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 697                 bool column_is_open = false;  // Is column open to overground
 698                 bool is_tunnel = false;  // Is tunnel or tunnel floor
 699                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 700                 u32 index3d = (z - node_min.Z) * zstride_1d + csize.Y * ystride +
 701                         (x - node_min.X);
 702                 // Biome of column
 703                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index2d]);
 704
 705                 // Don't excavate the overgenerated stone at node_max.Y + 1,
 706                 // this creates a 'roof' over the tunnel, preventing light in
 707                 // tunnels at mapchunk borders when generating mapchunks upwards.
 708                 // This 'roof' is removed when the mapchunk above is generated.
 709                 for (s16 y = node_max.Y; y >= node_min.Y - 1; y--,
 710                                 index3d -= ystride,
 711                                 vm->m_area.add_y(em, vi, -1)) {
 712
 713                         content_t c = vm->m_data[vi].getContent();
 714                         if (c == CONTENT_AIR || c == biome->c_water_top ||
 715                                         c == biome->c_water) {
 716                                 column_is_open = true;
 717                                 continue;
 718                         }
 719                         // Ground
 720                         float d1 = contour(noise_cave1->result[index3d]);
 721                         float d2 = contour(noise_cave2->result[index3d]);
 722
 723                         if (d1 * d2 > 0.3f && ndef->get(c).is_ground_content) {
 724                                 // In tunnel and ground content, excavate
 725                                 vm->m_data[vi] = MapNode(CONTENT_AIR);
 726                                 is_tunnel = true;
 727                         } else {
 728                                 // Not in tunnel or not ground content
 729                                 if (is_tunnel && column_is_open &&
 730                                                 (c == biome->c_filler || c == biome->c_stone))
 731                                         // Tunnel entrance floor
 732                                         vm->m_data[vi] = MapNode(biome->c_top);
 733
 734                                 column_is_open = false;
 735                                 is_tunnel = false;
 736                         }
 737                 }
 738         }
 739
 740         if (node_max.Y > MGFRACTAL_LARGE_CAVE_DEPTH)
 741                 return;
 742
 743         PseudoRandom ps(blockseed + 21343);
 744         u32 bruises_count = ps.range(0, 2);
 745         for (u32 i = 0; i < bruises_count; i++) {
 746                 CaveV5 cave(this, &ps);
 747                 cave.makeCave(node_min, node_max, max_stone_y);
 748         }
 749 }