src/mapgen.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 "biome.h"
  24 #include "mapblock.h"
  25 #include "mapnode.h"
  26 #include "map.h"
  27 //#include "serverobject.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "content_mapnode.h" // For content_mapnode_get_new_name
  31 #include "voxelalgorithms.h"
  32 #include "profiler.h"
  33 #include "settings.h" // For g_settings
  34 #include "main.h" // For g_profiler
  35 #include "treegen.h"
  36 #include "mapgen_v6.h"
  37 #include "mapgen_v7.h"
  38
  39 FlagDesc flagdesc_mapgen[] = {
  40         {"trees",          MG_TREES},
  41         {"caves",          MG_CAVES},
  42         {"dungeons",       MG_DUNGEONS},
  43         {"v6_jungles",     MGV6_JUNGLES},
  44         {"v6_biome_blend", MGV6_BIOME_BLEND},
  45         {"flat",           MG_FLAT},
  46         {NULL,             0}
  47 };
  48
  49 FlagDesc flagdesc_ore[] = {
  50         {"absheight",            OREFLAG_ABSHEIGHT},
  51         {"scatter_noisedensity", OREFLAG_DENSITY},
  52         {"claylike_nodeisnt",    OREFLAG_NODEISNT},
  53         {NULL,                   0}
  54 };
  55
  56
  57 ///////////////////////////////////////////////////////////////////////////////
  58
  59
  60 Ore *createOre(OreType type) {
  61         switch (type) {
  62                 case ORE_SCATTER:
  63                         return new OreScatter;
  64                 case ORE_SHEET:
  65                         return new OreSheet;
  66                 //case ORE_CLAYLIKE: //TODO: implement this!
  67                 //      return new OreClaylike;
  68                 default:
  69                         return NULL;
  70         }
  71 }
  72
  73
  74 Ore::~Ore() {
  75         delete np;
  76         delete noise;
  77 }
  78
  79
  80 void Ore::resolveNodeNames(INodeDefManager *ndef) {
  81         if (ore == CONTENT_IGNORE) {
  82                 ore = ndef->getId(ore_name);
  83                 if (ore == CONTENT_IGNORE) {
  84                         errorstream << "Ore::resolveNodeNames: ore node '"
  85                                 << ore_name << "' not defined";
  86                         ore     = CONTENT_AIR;
  87                         wherein = CONTENT_AIR;
  88                 }
  89         }
  90
  91         if (wherein == CONTENT_IGNORE) {
  92                 wherein = ndef->getId(wherein_name);
  93                 if (wherein == CONTENT_IGNORE) {
  94                         errorstream << "Ore::resolveNodeNames: wherein node '"
  95                                 << wherein_name << "' not defined";
  96                         ore     = CONTENT_AIR;
  97                         wherein = CONTENT_AIR;
  98                 }
  99         }
 100 }
 101
 102
 103 void Ore::placeOre(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax) {
 104         int in_range = 0;
 105
 106         in_range |= (nmin.Y <= height_max && nmax.Y >= height_min);
 107         if (flags & OREFLAG_ABSHEIGHT)
 108                 in_range |= (nmin.Y >= -height_max && nmax.Y <= -height_min) << 1;
 109         if (!in_range)
 110                 return;
 111
 112         resolveNodeNames(mg->ndef);
 113
 114         int ymin, ymax;
 115         if (in_range & ORE_RANGE_MIRROR) {
 116                 ymin = MYMAX(nmin.Y, -height_max);
 117                 ymax = MYMIN(nmax.Y, -height_min);
 118         } else {
 119                 ymin = MYMAX(nmin.Y, height_min);
 120                 ymax = MYMIN(nmax.Y, height_max);
 121         }
 122         if (clust_size >= ymax - ymin + 1)
 123                 return;
 124
 125         nmin.Y = ymin;
 126         nmax.Y = ymax;
 127         generate(mg->vm, mg->seed, blockseed, nmin, nmax);
 128 }
 129
 130
 131 void OreScatter::generate(ManualMapVoxelManipulator *vm, int seed,
 132                                                   u32 blockseed, v3s16 nmin, v3s16 nmax) {
 133         PseudoRandom pr(blockseed);
 134         MapNode n_ore(ore, 0, ore_param2);
 135
 136         int volume = (nmax.X - nmin.X + 1) *
 137                                  (nmax.Y - nmin.Y + 1) *
 138                                  (nmax.Z - nmin.Z + 1);
 139         int csize     = clust_size;
 140         int orechance = (csize * csize * csize) / clust_num_ores;
 141         int nclusters = volume / clust_scarcity;
 142
 143         for (int i = 0; i != nclusters; i++) {
 144                 int x0 = pr.range(nmin.X, nmax.X - csize + 1);
 145                 int y0 = pr.range(nmin.Y, nmax.Y - csize + 1);
 146                 int z0 = pr.range(nmin.Z, nmax.Z - csize + 1);
 147
 148                 if (np && (NoisePerlin3D(np, x0, y0, z0, seed) < nthresh))
 149                         continue;
 150
 151                 for (int z1 = 0; z1 != csize; z1++)
 152                 for (int y1 = 0; y1 != csize; y1++)
 153                 for (int x1 = 0; x1 != csize; x1++) {
 154                         if (pr.range(1, orechance) != 1)
 155                                 continue;
 156
 157                         u32 i = vm->m_area.index(x0 + x1, y0 + y1, z0 + z1);
 158                         if (vm->m_data[i].getContent() == wherein)
 159                                 vm->m_data[i] = n_ore;
 160                 }
 161         }
 162 }
 163
 164
 165 void OreSheet::generate(ManualMapVoxelManipulator *vm, int seed,
 166                                                 u32 blockseed, v3s16 nmin, v3s16 nmax) {
 167         PseudoRandom pr(blockseed + 4234);
 168         MapNode n_ore(ore, 0, ore_param2);
 169
 170         int max_height = clust_size;
 171         int y_start = pr.range(nmin.Y, nmax.Y - max_height);
 172
 173         if (!noise) {
 174                 int sx = nmax.X - nmin.X + 1;
 175                 int sz = nmax.Z - nmin.Z + 1;
 176                 noise = new Noise(np, 0, sx, sz);
 177         }
 178         noise->seed = seed + y_start;
 179         noise->perlinMap2D(nmin.X, nmin.Z);
 180
 181         int index = 0;
 182         for (int z = nmin.Z; z <= nmax.Z; z++)
 183         for (int x = nmin.X; x <= nmax.X; x++) {
 184                 float noiseval = noise->result[index++];
 185                 if (noiseval < nthresh)
 186                         continue;
 187
 188                 int height = max_height * (1. / pr.range(1, 3));
 189                 int y0 = y_start + np->scale * noiseval; //pr.range(1, 3) - 1;
 190                 int y1 = y0 + height;
 191                 for (int y = y0; y != y1; y++) {
 192                         u32 i = vm->m_area.index(x, y, z);
 193                         if (!vm->m_area.contains(i))
 194                                 continue;
 195
 196                         if (vm->m_data[i].getContent() == wherein)
 197                                 vm->m_data[i] = n_ore;
 198                 }
 199         }
 200 }
 201
 202
 203 Decoration *createDecoration(DecorationType type) {
 204         switch (type) {
 205                 case DECO_SIMPLE:
 206                         return new DecoSimple;
 207                 //case DECO_SCHEMATIC:
 208                 //      return new DecoSchematic;
 209                 //case DECO_LSYSTEM:
 210                 //      return new DecoLSystem;
 211                 default:
 212                         return NULL;
 213         }
 214 }
 215
 216
 217 Decoration::~Decoration() {
 218         delete np;
 219 }
 220
 221
 222 void Decoration::resolveNodeNames(INodeDefManager *ndef) {
 223         if (c_place_on == CONTENT_IGNORE)
 224                 c_place_on = ndef->getId(place_on_name);
 225 }
 226
 227
 228 void Decoration::placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax) {
 229         resolveNodeNames(mg->ndef);
 230
 231         PseudoRandom ps(blockseed + 53);
 232         int carea_size = nmax.X - nmin.X + 1;
 233
 234         // Divide area into parts
 235         if (carea_size % sidelen) {
 236                 errorstream << "Decoration::placeDeco: chunk size is not divisible by "
 237                         "sidelen; setting sidelen to " << carea_size << std::endl;
 238                 sidelen = carea_size;
 239         }
 240
 241         s16 divlen = carea_size / sidelen;
 242         int area = sidelen * sidelen;
 243
 244         for (s16 z0 = 0; z0 < divlen; z0++)
 245         for (s16 x0 = 0; x0 < divlen; x0++) {
 246                 v2s16 p2d_center( // Center position of part of division
 247                         nmin.X + sidelen / 2 + sidelen * x0,
 248                         nmin.Z + sidelen / 2 + sidelen * z0
 249                 );
 250                 v2s16 p2d_min( // Minimum edge of part of division
 251                         nmin.X + sidelen * x0,
 252                         nmin.Z + sidelen * z0
 253                 );
 254                 v2s16 p2d_max( // Maximum edge of part of division
 255                         nmin.X + sidelen + sidelen * x0 - 1,
 256                         nmin.Z + sidelen + sidelen * z0 - 1
 257                 );
 258
 259                 // Amount of decorations
 260                 float nval = np ?
 261                         NoisePerlin2D(np, p2d_center.X, p2d_center.Y, mapseed) :
 262                         fill_ratio;
 263                 u32 deco_count = area * MYMAX(nval, 0.f);
 264
 265                 for (u32 i = 0; i < deco_count; i++) {
 266                         s16 x = ps.range(p2d_min.X, p2d_max.X);
 267                         s16 z = ps.range(p2d_min.Y, p2d_max.Y);
 268
 269                         int mapindex = carea_size * (z - nmin.Z) + (x - nmin.X);
 270
 271                         s16 y = mg->heightmap ?
 272                                         mg->heightmap[mapindex] :
 273                                         mg->findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
 274
 275                         if (y < nmin.Y || y > nmax.Y)
 276                                 continue;
 277
 278                         int height = getHeight();
 279                         int max_y = nmax.Y + MAP_BLOCKSIZE;
 280                         if (y + 1 + height > max_y) {
 281                                 continue;
 282 #if 0
 283                                 printf("Decoration at (%d %d %d) cut off\n", x, y, z);
 284                                 //add to queue
 285                                 JMutexAutoLock cutofflock(cutoff_mutex);
 286                                 cutoffs.push_back(CutoffData(x, y, z, height));
 287 #endif
 288                         }
 289
 290                         if (mg->biomemap) {
 291                                 std::set<u8>::iterator iter;
 292
 293                                 if (biomes.size()) {
 294                                         iter = biomes.find(mg->biomemap[mapindex]);
 295                                         if (iter == biomes.end())
 296                                                 continue;
 297                                 }
 298                         }
 299
 300                         generate(mg, &ps, max_y, 0, v3s16(x, y, z));
 301                 }
 302         }
 303 }
 304
 305
 306 #if 0
 307 void Decoration::placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax) {
 308         PseudoRandom pr(blockseed + 53);
 309         std::vector<CutoffData> handled_cutoffs;
 310
 311         // Copy over the cutoffs we're interested in so we don't needlessly hold a lock
 312         {
 313                 JMutexAutoLock cutofflock(cutoff_mutex);
 314                 for (std::list<CutoffData>::iterator i = cutoffs.begin();
 315                         i != cutoffs.end(); ++i) {
 316                         CutoffData cutoff = *i;
 317                         v3s16 p    = cutoff.p;
 318                         s16 height = cutoff.height;
 319                         if (p.X < nmin.X || p.X > nmax.X ||
 320                                 p.Z < nmin.Z || p.Z > nmax.Z)
 321                                 continue;
 322                         if (p.Y + height < nmin.Y || p.Y > nmax.Y)
 323                                 continue;
 324
 325                         handled_cutoffs.push_back(cutoff);
 326                 }
 327         }
 328
 329         // Generate the cutoffs
 330         for (size_t i = 0; i != handled_cutoffs.size(); i++) {
 331                 v3s16 p    = handled_cutoffs[i].p;
 332                 s16 height = handled_cutoffs[i].height;
 333
 334                 if (p.Y + height > nmax.Y) {
 335                         //printf("Decoration at (%d %d %d) cut off again!\n", p.X, p.Y, p.Z);
 336                         cuttoffs.push_back(v3s16(p.X, p.Y, p.Z));
 337                 }
 338
 339                 generate(mg, &pr, nmax.Y, nmin.Y - p.Y, v3s16(p.X, nmin.Y, p.Z));
 340         }
 341
 342         // Remove cutoffs that were handled from the cutoff list
 343         {
 344                 JMutexAutoLock cutofflock(cutoff_mutex);
 345                 for (std::list<CutoffData>::iterator i = cutoffs.begin();
 346                         i != cutoffs.end(); ++i) {
 347
 348                         for (size_t j = 0; j != handled_cutoffs.size(); j++) {
 349                                 CutoffData coff = *i;
 350                                 if (coff.p == handled_cutoffs[j].p)
 351                                         i = cutoffs.erase(i);
 352                         }
 353                 }
 354         }
 355 }
 356 #endif
 357
 358
 359 void DecoSimple::resolveNodeNames(INodeDefManager *ndef) {
 360         Decoration::resolveNodeNames(ndef);
 361
 362         if (c_deco == CONTENT_IGNORE) {
 363                 c_deco = ndef->getId(deco_name);
 364                 if (c_deco == CONTENT_IGNORE) {
 365                         errorstream << "DecoSimple::resolveNodeNames: decoration node '"
 366                                 << deco_name << "' not defined";
 367                         c_deco = CONTENT_AIR;
 368                 }
 369         }
 370         if (c_spawnby == CONTENT_IGNORE) {
 371                 c_spawnby = ndef->getId(spawnby_name);
 372                 if (c_spawnby == CONTENT_IGNORE) {
 373                         errorstream << "DecoSimple::resolveNodeNames: spawnby node '"
 374                                 << deco_name << "' not defined";
 375                         nspawnby = -1;
 376                         c_spawnby = CONTENT_AIR;
 377                 }
 378         }
 379
 380         if (c_decolist.size())
 381                 return;
 382
 383         for (size_t i = 0; i != decolist_names.size(); i++) {
 384                 content_t c = ndef->getId(decolist_names[i]);
 385                 if (c == CONTENT_IGNORE) {
 386                         errorstream << "DecoSimple::resolveNodeNames: decolist node '"
 387                                 << decolist_names[i] << "' not defined";
 388                         c = CONTENT_AIR;
 389                 }
 390                 c_decolist.push_back(c);
 391         }
 392 }
 393
 394
 395 void DecoSimple::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, s16 start_y, v3s16 p) {
 396         ManualMapVoxelManipulator *vm = mg->vm;
 397
 398         u32 vi = vm->m_area.index(p);
 399         if (vm->m_data[vi].getContent() != c_place_on &&
 400                 c_place_on != CONTENT_IGNORE)
 401                 return;
 402
 403         if (nspawnby != -1) {
 404                 int nneighs = 0;
 405                 v3s16 dirs[8] = { // a Moore neighborhood
 406                         v3s16( 0, 0,  1),
 407                         v3s16( 0, 0, -1),
 408                         v3s16( 1, 0,  0),
 409                         v3s16(-1, 0,  0),
 410                         v3s16( 1, 0,  1),
 411                         v3s16(-1, 0,  1),
 412                         v3s16(-1, 0, -1),
 413                         v3s16( 1, 0, -1)
 414                 };
 415
 416                 for (int i = 0; i != 8; i++) {
 417                         u32 index = vm->m_area.index(p + dirs[i]);
 418                         if (vm->m_area.contains(index) &&
 419                                 vm->m_data[index].getContent() == c_spawnby)
 420                                 nneighs++;
 421                 }
 422
 423                 if (nneighs < nspawnby)
 424                         return;
 425         }
 426
 427         size_t ndecos = c_decolist.size();
 428         content_t c = ndecos ? c_decolist[pr->range(0, ndecos - 1)] : c_deco;
 429
 430         s16 height = (deco_height_max > 0) ?
 431                 pr->range(deco_height, deco_height_max) : deco_height;
 432
 433         height = MYMIN(height, max_y - p.Y);
 434
 435         v3s16 em = vm->m_area.getExtent();
 436         for (int i = start_y; i < height; i++) {
 437                 vm->m_area.add_y(em, vi, 1);
 438                 vm->m_data[vi] = MapNode(c);
 439         }
 440 }
 441
 442
 443 int DecoSimple::getHeight() {
 444         return (deco_height_max > 0) ? deco_height_max : deco_height;
 445 }
 446
 447
 448 std::string DecoSimple::getName() {
 449         return deco_name;
 450 }
 451
 452
 453 ///////////////////////////////////////////////////////////////////////////////
 454
 455
 456 Mapgen::Mapgen() {
 457         seed        = 0;
 458         water_level = 0;
 459         generating  = false;
 460         id          = -1;
 461         vm          = NULL;
 462         ndef        = NULL;
 463         heightmap   = NULL;
 464         biomemap    = NULL;
 465 }
 466
 467
 468 // Returns Y one under area minimum if not found
 469 s16 Mapgen::findGroundLevelFull(v2s16 p2d) {
 470         v3s16 em = vm->m_area.getExtent();
 471         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 472         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 473         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 474         s16 y;
 475
 476         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 477                 MapNode &n = vm->m_data[i];
 478                 if (ndef->get(n).walkable)
 479                         break;
 480
 481                 vm->m_area.add_y(em, i, -1);
 482         }
 483         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 484 }
 485
 486
 487 s16 Mapgen::findGroundLevel(v2s16 p2d, s16 ymin, s16 ymax) {
 488         v3s16 em = vm->m_area.getExtent();
 489         u32 i = vm->m_area.index(p2d.X, ymax, p2d.Y);
 490         s16 y;
 491
 492         for (y = ymax; y >= ymin; y--) {
 493                 MapNode &n = vm->m_data[i];
 494                 if (ndef->get(n).walkable)
 495                         break;
 496
 497                 vm->m_area.add_y(em, i, -1);
 498         }
 499         return y;
 500 }
 501
 502
 503 void Mapgen::updateHeightmap(v3s16 nmin, v3s16 nmax) {
 504         if (!heightmap)
 505                 return;
 506
 507         //TimeTaker t("Mapgen::updateHeightmap", NULL, PRECISION_MICRO);
 508         int index = 0;
 509         for (s16 z = nmin.Z; z <= nmax.Z; z++) {
 510                 for (s16 x = nmin.X; x <= nmax.X; x++) {
 511                         s16 y = findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
 512                         heightmap[index++] = y;
 513                 }
 514         }
 515         //printf("updateHeightmap: %dus\n", t.stop());
 516 }
 517
 518
 519 void Mapgen::updateLiquid(UniqueQueue<v3s16> *trans_liquid, v3s16 nmin, v3s16 nmax) {
 520         bool isliquid, wasliquid;
 521         v3s16 em  = vm->m_area.getExtent();
 522
 523         for (s16 z = nmin.Z; z <= nmax.Z; z++) {
 524                 for (s16 x = nmin.X; x <= nmax.X; x++) {
 525                         wasliquid = true;
 526
 527                         u32 i = vm->m_area.index(x, nmax.Y, z);
 528                         for (s16 y = nmax.Y; y >= nmin.Y; y--) {
 529                                 isliquid = ndef->get(vm->m_data[i]).isLiquid();
 530
 531                                 // there was a change between liquid and nonliquid, add to queue
 532                                 if (isliquid != wasliquid)
 533                                         trans_liquid->push_back(v3s16(x, y, z));
 534
 535                                 wasliquid = isliquid;
 536                                 vm->m_area.add_y(em, i, -1);
 537                         }
 538                 }
 539         }
 540 }
 541
 542
 543 void Mapgen::setLighting(v3s16 nmin, v3s16 nmax, u8 light) {
 544         ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update", SPT_AVG);
 545         VoxelArea a(nmin, nmax);
 546
 547         for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
 548                 for (int y = a.MinEdge.Y; y <= a.MaxEdge.Y; y++) {
 549                         u32 i = vm->m_area.index(a.MinEdge.X, y, z);
 550                         for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++, i++)
 551                                 vm->m_data[i].param1 = light;
 552                 }
 553         }
 554 }
 555
 556
 557 void Mapgen::lightSpread(VoxelArea &a, v3s16 p, u8 light) {
 558         if (light <= 1 || !a.contains(p))
 559                 return;
 560
 561         u32 vi = vm->m_area.index(p);
 562         MapNode &nn = vm->m_data[vi];
 563
 564         light--;
 565         // should probably compare masked, but doesn't seem to make a difference
 566         if (light <= nn.param1 || !ndef->get(nn).light_propagates)
 567                 return;
 568
 569         nn.param1 = light;
 570
 571         lightSpread(a, p + v3s16(0, 0, 1), light);
 572         lightSpread(a, p + v3s16(0, 1, 0), light);
 573         lightSpread(a, p + v3s16(1, 0, 0), light);
 574         lightSpread(a, p - v3s16(0, 0, 1), light);
 575         lightSpread(a, p - v3s16(0, 1, 0), light);
 576         lightSpread(a, p - v3s16(1, 0, 0), light);
 577 }
 578
 579
 580 void Mapgen::calcLighting(v3s16 nmin, v3s16 nmax) {
 581         VoxelArea a(nmin, nmax);
 582         bool block_is_underground = (water_level >= nmax.Y);
 583
 584         ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update", SPT_AVG);
 585         //TimeTaker t("updateLighting");
 586
 587         // first, send vertical rays of sunshine downward
 588         v3s16 em = vm->m_area.getExtent();
 589         for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
 590                 for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++) {
 591                         // see if we can get a light value from the overtop
 592                         u32 i = vm->m_area.index(x, a.MaxEdge.Y + 1, z);
 593                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 594                                 if (block_is_underground)
 595                                         continue;
 596                         } else if ((vm->m_data[i].param1 & 0x0F) != LIGHT_SUN) {
 597                                 continue;
 598                         }
 599                         vm->m_area.add_y(em, i, -1);
 600
 601                         for (int y = a.MaxEdge.Y; y >= a.MinEdge.Y; y--) {
 602                                 MapNode &n = vm->m_data[i];
 603                                 if (!ndef->get(n).sunlight_propagates)
 604                                         break;
 605                                 n.param1 = LIGHT_SUN;
 606                                 vm->m_area.add_y(em, i, -1);
 607                         }
 608                 }
 609         }
 610
 611         // now spread the sunlight and light up any sources
 612         for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
 613                 for (int y = a.MinEdge.Y; y <= a.MaxEdge.Y; y++) {
 614                         u32 i = vm->m_area.index(a.MinEdge.X, y, z);
 615                         for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++, i++) {
 616                                 MapNode &n = vm->m_data[i];
 617                                 if (n.getContent() == CONTENT_IGNORE ||
 618                                         !ndef->get(n).light_propagates)
 619                                         continue;
 620
 621                                 u8 light_produced = ndef->get(n).light_source & 0x0F;
 622                                 if (light_produced)
 623                                         n.param1 = light_produced;
 624
 625                                 u8 light = n.param1 & 0x0F;
 626                                 if (light) {
 627                                         lightSpread(a, v3s16(x,     y,     z + 1), light);
 628                                         lightSpread(a, v3s16(x,     y + 1, z    ), light);
 629                                         lightSpread(a, v3s16(x + 1, y,     z    ), light);
 630                                         lightSpread(a, v3s16(x,     y,     z - 1), light);
 631                                         lightSpread(a, v3s16(x,     y - 1, z    ), light);
 632                                         lightSpread(a, v3s16(x - 1, y,     z    ), light);
 633                                 }
 634                         }
 635                 }
 636         }
 637
 638         //printf("updateLighting: %dms\n", t.stop());
 639 }
 640
 641
 642 void Mapgen::calcLightingOld(v3s16 nmin, v3s16 nmax) {
 643         enum LightBank banks[2] = {LIGHTBANK_DAY, LIGHTBANK_NIGHT};
 644         VoxelArea a(nmin, nmax);
 645         bool block_is_underground = (water_level > nmax.Y);
 646         bool sunlight = !block_is_underground;
 647
 648         ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update", SPT_AVG);
 649
 650         for (int i = 0; i < 2; i++) {
 651                 enum LightBank bank = banks[i];
 652                 std::set<v3s16> light_sources;
 653                 std::map<v3s16, u8> unlight_from;
 654
 655                 voxalgo::clearLightAndCollectSources(*vm, a, bank, ndef,
 656                                                                                          light_sources, unlight_from);
 657                 voxalgo::propagateSunlight(*vm, a, sunlight, light_sources, ndef);
 658
 659                 vm->unspreadLight(bank, unlight_from, light_sources, ndef);
 660                 vm->spreadLight(bank, light_sources, ndef);
 661         }
 662 }
 663
 664
 665 //////////////////////// Mapgen V6 parameter read/write
 666
 667 bool MapgenV6Params::readParams(Settings *settings) {
 668         freq_desert = settings->getFloat("mgv6_freq_desert");
 669         freq_beach  = settings->getFloat("mgv6_freq_beach");
 670
 671         bool success =
 672                 settings->getNoiseParams("mgv6_np_terrain_base",   np_terrain_base)   &&
 673                 settings->getNoiseParams("mgv6_np_terrain_higher", np_terrain_higher) &&
 674                 settings->getNoiseParams("mgv6_np_steepness",      np_steepness)      &&
 675                 settings->getNoiseParams("mgv6_np_height_select",  np_height_select)  &&
 676                 settings->getNoiseParams("mgv6_np_mud",            np_mud)            &&
 677                 settings->getNoiseParams("mgv6_np_beach",          np_beach)          &&
 678                 settings->getNoiseParams("mgv6_np_biome",          np_biome)          &&
 679                 settings->getNoiseParams("mgv6_np_cave",           np_cave)           &&
 680                 settings->getNoiseParams("mgv6_np_humidity",       np_humidity)       &&
 681                 settings->getNoiseParams("mgv6_np_trees",          np_trees)          &&
 682                 settings->getNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 683         return success;
 684 }
 685
 686
 687 void MapgenV6Params::writeParams(Settings *settings) {
 688         settings->setFloat("mgv6_freq_desert", freq_desert);
 689         settings->setFloat("mgv6_freq_beach",  freq_beach);
 690
 691         settings->setNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 692         settings->setNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 693         settings->setNoiseParams("mgv6_np_steepness",      np_steepness);
 694         settings->setNoiseParams("mgv6_np_height_select",  np_height_select);
 695         settings->setNoiseParams("mgv6_np_mud",            np_mud);
 696         settings->setNoiseParams("mgv6_np_beach",          np_beach);
 697         settings->setNoiseParams("mgv6_np_biome",          np_biome);
 698         settings->setNoiseParams("mgv6_np_cave",           np_cave);
 699         settings->setNoiseParams("mgv6_np_humidity",       np_humidity);
 700         settings->setNoiseParams("mgv6_np_trees",          np_trees);
 701         settings->setNoiseParams("mgv6_np_apple_trees",    np_apple_trees);
 702 }
 703
 704
 705 bool MapgenV7Params::readParams(Settings *settings) {
 706         bool success =
 707                 settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base)    &&
 708                 settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt)     &&
 709                 settings->getNoiseParams("mgv7_np_terrain_mod",     np_terrain_mod)     &&
 710                 settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist) &&
 711                 settings->getNoiseParams("mgv7_np_height_select",   np_height_select)   &&
 712                 settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 713         return success;
 714 }
 715
 716
 717 void MapgenV7Params::writeParams(Settings *settings) {
 718         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 719         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 720         settings->setNoiseParams("mgv7_np_terrain_mod",     np_terrain_mod);
 721         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 722         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 723         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 724 }
 725
 726
 727 /////////////////////////////////// legacy static functions for farmesh
 728
 729 s16 Mapgen::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision) {
 730         //just need to return something
 731         s16 level = 5;
 732         return level;
 733 }
 734
 735
 736 bool Mapgen::get_have_beach(u64 seed, v2s16 p2d) {
 737         double sandnoise = noise2d_perlin(
 738                                 0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 739                                 seed+59420, 3, 0.50);
 740
 741         return (sandnoise > 0.15);
 742 }
 743
 744
 745 double Mapgen::tree_amount_2d(u64 seed, v2s16 p) {
 746         double noise = noise2d_perlin(
 747                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 748                         seed+2, 4, 0.66);
 749         double zeroval = -0.39;
 750         if(noise < zeroval)
 751                 return 0;
 752         else
 753                 return 0.04 * (noise-zeroval) / (1.0-zeroval);
 754 }