src/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   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
  21 #include "mapgen.h"
  22 #include "voxel.h"
  23 #include "noise.h"
  24 #include "mapblock.h"
  25 #include "mapnode.h"
  26 #include "map.h"
  27 #include "content_sao.h"
  28 #include "nodedef.h"
  29 #include "voxelalgorithms.h"
  30 #include "profiler.h"
  31 #include "settings.h" // For g_settings
  32 #include "emerge.h"
  33 #include "dungeongen.h"
  34 #include "cavegen.h"
  35 #include "treegen.h"
  36 #include "mg_biome.h"
  37 #include "mg_ore.h"
  38 #include "mg_decoration.h"
  39 #include "mapgen_v7.h"
  40
  41
  42 FlagDesc flagdesc_mapgen_v7[] = {
  43         {"mountains", MGV7_MOUNTAINS},
  44         {"ridges",    MGV7_RIDGES},
  45         {NULL,        0}
  46 };
  47
  48 ///////////////////////////////////////////////////////////////////////////////
  49
  50
  51 MapgenV7::MapgenV7(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->ridge_heightmap = new s16[csize.X * csize.Z];
  65
  66         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  67         this->spflags = sp->spflags;
  68
  69         //// Terrain noise
  70         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  71         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  72         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  73         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  74         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  75         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  76         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  77
  78         //// 3d terrain noise
  79         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  80         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  81         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y + 2, csize.Z);
  82         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y + 2, csize.Z);
  83
  84         //// Biome noise
  85         noise_heat     = new Noise(&params->np_biome_heat,     seed, csize.X, csize.Z);
  86         noise_humidity = new Noise(&params->np_biome_humidity, seed, csize.X, csize.Z);
  87
  88         //// Resolve nodes to be used
  89         INodeDefManager *ndef = emerge->ndef;
  90
  91         c_stone                = ndef->getId("mapgen_stone");
  92         c_water_source         = ndef->getId("mapgen_water_source");
  93         c_lava_source          = ndef->getId("mapgen_lava_source");
  94         c_desert_stone         = ndef->getId("mapgen_desert_stone");
  95         c_ice                  = ndef->getId("mapgen_ice");
  96
  97         c_cobble               = ndef->getId("mapgen_cobble");
  98         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
  99         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 100         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 101         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 102
 103         if (c_ice == CONTENT_IGNORE)
 104                 c_ice = CONTENT_AIR;
 105         if (c_mossycobble == CONTENT_IGNORE)
 106                 c_mossycobble = c_cobble;
 107         if (c_stair_cobble == CONTENT_IGNORE)
 108                 c_stair_cobble = c_cobble;
 109         if (c_sandstonebrick == CONTENT_IGNORE)
 110                 c_sandstonebrick = c_desert_stone;
 111         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 112                 c_stair_sandstonebrick = c_sandstonebrick;
 113 }
 114
 115
 116 MapgenV7::~MapgenV7()
 117 {
 118         delete noise_terrain_base;
 119         delete noise_terrain_persist;
 120         delete noise_height_select;
 121         delete noise_terrain_alt;
 122         delete noise_filler_depth;
 123         delete noise_mount_height;
 124         delete noise_ridge_uwater;
 125         delete noise_mountain;
 126         delete noise_ridge;
 127         delete noise_cave1;
 128         delete noise_cave2;
 129
 130         delete noise_heat;
 131         delete noise_humidity;
 132
 133         delete[] ridge_heightmap;
 134         delete[] heightmap;
 135         delete[] biomemap;
 136 }
 137
 138
 139 MapgenV7Params::MapgenV7Params()
 140 {
 141         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 142
 143         np_terrain_base    = NoiseParams(4,    70,  v3f(300, 300, 300), 82341, 6, 0.7,  2.0);
 144         np_terrain_alt     = NoiseParams(4,    25,  v3f(600, 600, 600), 5934,  5, 0.6,  2.0);
 145         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500, 500, 500), 539,   3, 0.6,  2.0);
 146         np_height_select   = NoiseParams(-0.5, 1,   v3f(250, 250, 250), 4213,  5, 0.69, 2.0);
 147         np_filler_depth    = NoiseParams(0,    1.2, v3f(150, 150, 150), 261,   4, 0.7,  2.0);
 148         np_mount_height    = NoiseParams(100,  30,  v3f(500, 500, 500), 72449, 4, 0.6,  2.0);
 149         np_ridge_uwater    = NoiseParams(0,    1,   v3f(500, 500, 500), 85039, 4, 0.6,  2.0);
 150         np_mountain        = NoiseParams(-0.6, 1,   v3f(250, 350, 250), 5333,  5, 0.68, 2.0);
 151         np_ridge           = NoiseParams(0,    1,   v3f(100, 100, 100), 6467,  4, 0.75, 2.0);
 152         np_cave1           = NoiseParams(0,    12,  v3f(100, 100, 100), 52534, 4, 0.5,  2.0);
 153         np_cave2           = NoiseParams(0,    12,  v3f(100, 100, 100), 10325, 4, 0.5,  2.0);
 154 }
 155
 156
 157 void MapgenV7Params::readParams(const Settings *settings)
 158 {
 159         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 160
 161         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 162         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 163         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 164         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 165         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 166         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 167         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 168         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 169         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 170         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 171         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 172 }
 173
 174
 175 void MapgenV7Params::writeParams(Settings *settings) const
 176 {
 177         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 178
 179         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 180         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 181         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 182         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 183         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 184         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 185         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 186         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 187         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 188         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 189         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 190 }
 191
 192
 193 ///////////////////////////////////////
 194
 195
 196 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 197 {
 198         // Base terrain calculation
 199         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 200
 201         // Ridge/river terrain calculation
 202         float width = 0.2;
 203         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 204         // actually computing the depth of the ridge is much more expensive;
 205         // if inside a river, simply guess
 206         if (fabs(uwatern) <= width)
 207                 return water_level - 10;
 208
 209         // Mountain terrain calculation
 210         int iters = 128; // don't even bother iterating more than 128 times..
 211         while (iters--) {
 212                 //current point would have been air
 213                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 214                         return y;
 215
 216                 y++;
 217         }
 218
 219         return y;
 220 }
 221
 222
 223 void MapgenV7::makeChunk(BlockMakeData *data)
 224 {
 225         // Pre-conditions
 226         assert(data->vmanip);
 227         assert(data->nodedef);
 228         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 229                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 230                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 231         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 232                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 233                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 234
 235         this->generating = true;
 236         this->vm   = data->vmanip;
 237         this->ndef = data->nodedef;
 238         //TimeTaker t("makeChunk");
 239
 240         v3s16 blockpos_min = data->blockpos_min;
 241         v3s16 blockpos_max = data->blockpos_max;
 242         node_min = blockpos_min * MAP_BLOCKSIZE;
 243         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 244         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 245         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 246
 247         blockseed = getBlockSeed2(full_node_min, seed);
 248
 249         // Make some noise
 250         calculateNoise();
 251
 252         // Generate base terrain, mountains, and ridges with initial heightmaps
 253         s16 stone_surface_max_y = generateTerrain();
 254
 255         // Create heightmap
 256         updateHeightmap(node_min, node_max);
 257
 258         // Create biomemap at heightmap surface
 259         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 260                 noise_humidity->result, heightmap, biomemap);
 261
 262         // Actually place the biome-specific nodes
 263         bool desert_stone = generateBiomes(noise_heat->result, noise_humidity->result);
 264
 265         if (flags & MG_CAVES)
 266                 generateCaves(stone_surface_max_y);
 267
 268         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 269                 DungeonParams dp;
 270
 271                 dp.np_rarity  = nparams_dungeon_rarity;
 272                 dp.np_density = nparams_dungeon_density;
 273                 dp.np_wetness = nparams_dungeon_wetness;
 274                 dp.c_water    = c_water_source;
 275                 if (desert_stone) {
 276                         dp.c_cobble = c_desert_stone;
 277                         dp.c_moss   = c_desert_stone;
 278                         dp.c_stair  = c_desert_stone;
 279
 280                         dp.diagonal_dirs = true;
 281                         dp.mossratio     = 0.0;
 282                         dp.holesize      = v3s16(2, 3, 2);
 283                         dp.roomsize      = v3s16(2, 5, 2);
 284                         dp.notifytype    = GENNOTIFY_TEMPLE;
 285                 } else {
 286                         dp.c_cobble = c_cobble;
 287                         dp.c_moss   = c_mossycobble;
 288                         dp.c_stair  = c_stair_cobble;
 289
 290                         dp.diagonal_dirs = false;
 291                         dp.mossratio     = 3.0;
 292                         dp.holesize      = v3s16(1, 2, 1);
 293                         dp.roomsize      = v3s16(0, 0, 0);
 294                         dp.notifytype    = GENNOTIFY_DUNGEON;
 295                 }
 296
 297                 DungeonGen dgen(this, &dp);
 298                 dgen.generate(blockseed, full_node_min, full_node_max);
 299         }
 300
 301         // Generate the registered decorations
 302         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 303
 304         // Generate the registered ores
 305         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 306
 307         // Sprinkle some dust on top after everything else was generated
 308         dustTopNodes();
 309
 310         //printf("makeChunk: %dms\n", t.stop());
 311
 312         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 313
 314         if (flags & MG_LIGHT)
 315                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 316                         full_node_min, full_node_max);
 317
 318         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 319         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 320
 321         this->generating = false;
 322 }
 323
 324
 325 void MapgenV7::calculateNoise()
 326 {
 327         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 328         int x = node_min.X;
 329         int y = node_min.Y - 1;
 330         int z = node_min.Z;
 331
 332         noise_terrain_persist->perlinMap2D(x, z);
 333         float *persistmap = noise_terrain_persist->result;
 334
 335         noise_terrain_base->perlinMap2D(x, z, persistmap);
 336         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 337         noise_height_select->perlinMap2D(x, z);
 338
 339         if (flags & MG_CAVES) {
 340                 noise_cave1->perlinMap3D(x, y, z);
 341                 noise_cave2->perlinMap3D(x, y, z);
 342         }
 343
 344         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 345                 noise_ridge->perlinMap3D(x, y, z);
 346                 noise_ridge_uwater->perlinMap2D(x, z);
 347         }
 348
 349         if ((spflags & MGV7_MOUNTAINS) && node_max.Y >= 0) {
 350                 noise_mountain->perlinMap3D(x, y, z);
 351                 noise_mount_height->perlinMap2D(x, z);
 352         }
 353
 354         if (node_max.Y >= water_level) {
 355                 noise_filler_depth->perlinMap2D(x, z);
 356                 noise_heat->perlinMap2D(x, z);
 357                 noise_humidity->perlinMap2D(x, z);
 358         }
 359         //printf("calculateNoise: %dus\n", t.stop());
 360 }
 361
 362
 363 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 364 {
 365         float heat      = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed);
 366         float humidity  = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed);
 367         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 368
 369         return bmgr->getBiome(heat, humidity, groundlevel);
 370 }
 371
 372 //needs to be updated
 373 float MapgenV7::baseTerrainLevelAtPoint(int x, int z)
 374 {
 375         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 376         hselect = rangelim(hselect, 0.0, 1.0);
 377
 378         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 379
 380         noise_terrain_base->np.persist = persist;
 381         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 382
 383         noise_terrain_alt->np.persist = persist;
 384         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 385
 386         if (height_alt > height_base)
 387                 return height_alt;
 388
 389         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 390 }
 391
 392
 393 float MapgenV7::baseTerrainLevelFromMap(int index)
 394 {
 395         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 396         float height_base = noise_terrain_base->result[index];
 397         float height_alt  = noise_terrain_alt->result[index];
 398
 399         if (height_alt > height_base)
 400                 return height_alt;
 401
 402         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 403 }
 404
 405
 406 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z)
 407 {
 408         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 409         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 410         return mnt_n * mnt_h_n >= (float)y;
 411 }
 412
 413
 414 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y)
 415 {
 416         float mounthn = noise_mount_height->result[idx_xz];
 417         float mountn = noise_mountain->result[idx_xyz];
 418         return mountn * mounthn >= (float)y;
 419 }
 420
 421
 422 #if 0
 423 void MapgenV7::carveRivers() {
 424         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 425         MapNode n_stone(c_stone);
 426         u32 index = 0;
 427
 428         int river_depth = 4;
 429
 430         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 431         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 432                 float terrain_mod  = noise_terrain_mod->result[index];
 433                 NoiseParams *np = noise_terrain_river->np;
 434                 np.persist = noise_terrain_persist->result[index];
 435                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 436                 float height = terrain_river * (1 - abs(terrain_mod)) *
 437                                                 noise_terrain_river->np.scale;
 438                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 439
 440                 s16 y = heightmap[index];
 441                 if (height < 1.0 && y > river_depth &&
 442                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 443
 444                         for (s16 ry = y; ry != y - river_depth; ry--) {
 445                                 u32 vi = vm->m_area.index(x, ry, z);
 446                                 vm->m_data[vi] = n_air;
 447                         }
 448
 449                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 450                         vm->m_data[vi] = n_water_source;
 451                 }
 452         }
 453 }
 454 #endif
 455
 456
 457 int MapgenV7::generateTerrain()
 458 {
 459         int ymax = generateBaseTerrain();
 460
 461         if (spflags & MGV7_MOUNTAINS)
 462                 ymax = generateMountainTerrain(ymax);
 463
 464         if (spflags & MGV7_RIDGES)
 465                 generateRidgeTerrain();
 466
 467         return ymax;
 468 }
 469
 470
 471 int MapgenV7::generateBaseTerrain()
 472 {
 473         MapNode n_air(CONTENT_AIR);
 474         MapNode n_stone(c_stone);
 475         MapNode n_water(c_water_source);
 476
 477         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 478         v3s16 em = vm->m_area.getExtent();
 479         u32 index = 0;
 480
 481         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 482         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 483                 float surface_height = baseTerrainLevelFromMap(index);
 484                 s16 surface_y = (s16)surface_height;
 485
 486                 heightmap[index]       = surface_y;
 487                 ridge_heightmap[index] = surface_y;
 488
 489                 if (surface_y > stone_surface_max_y)
 490                         stone_surface_max_y = surface_y;
 491
 492                 u32 i = vm->m_area.index(x, node_min.Y - 1, z);
 493                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 494                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 495                                 if (y <= surface_y)
 496                                         vm->m_data[i] = n_stone;
 497                                 else if (y <= water_level)
 498                                         vm->m_data[i] = n_water;
 499                                 else
 500                                         vm->m_data[i] = n_air;
 501                         }
 502                         vm->m_area.add_y(em, i, 1);
 503                 }
 504         }
 505
 506         return stone_surface_max_y;
 507 }
 508
 509
 510 int MapgenV7::generateMountainTerrain(int ymax)
 511 {
 512         if (node_max.Y < 0)
 513                 return ymax;
 514
 515         MapNode n_stone(c_stone);
 516         u32 j = 0;
 517
 518         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 519         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 520                 u32 vi = vm->m_area.index(node_min.X, y, z);
 521                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 522                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 523                         content_t c = vm->m_data[vi].getContent();
 524
 525                         if (getMountainTerrainFromMap(j, index, y)
 526                                         && (c == CONTENT_AIR || c == c_water_source)) {
 527                                 vm->m_data[vi] = n_stone;
 528                                 if (y > ymax)
 529                                         ymax = y;
 530                         }
 531
 532                         vi++;
 533                         j++;
 534                 }
 535         }
 536
 537         return ymax;
 538 }
 539
 540
 541 void MapgenV7::generateRidgeTerrain()
 542 {
 543         if (node_max.Y < water_level)
 544                 return;
 545
 546         MapNode n_water(c_water_source);
 547         MapNode n_air(CONTENT_AIR);
 548         u32 index = 0;
 549         float width = 0.2; // TODO: figure out acceptable perlin noise values
 550
 551         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 552         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 553                 u32 vi = vm->m_area.index(node_min.X, y, z);
 554                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 555                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 556
 557                         if (heightmap[j] < water_level - 16)
 558                                 continue;
 559
 560                         float uwatern = noise_ridge_uwater->result[j] * 2;
 561                         if (fabs(uwatern) > width)
 562                                 continue;
 563
 564                         float altitude = y - water_level;
 565                         float height_mod = (altitude + 17) / 2.5;
 566                         float width_mod  = width - fabs(uwatern);
 567                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 568
 569                         if (nridge + width_mod * height_mod < 0.6)
 570                                 continue;
 571
 572                         if (y < ridge_heightmap[j])
 573                                 ridge_heightmap[j] = y - 1;
 574
 575                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 576                 }
 577         }
 578 }
 579
 580
 581 bool MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 582 {
 583         if (node_max.Y < water_level)
 584                 return false;
 585
 586         v3s16 em = vm->m_area.getExtent();
 587         u32 index = 0;
 588         bool desert_stone = false;
 589
 590         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 591         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 592                 Biome *biome = NULL;
 593                 s16 dfiller = 0;
 594                 s16 y0_top = 0;
 595                 s16 y0_filler = 0;
 596                 s16 depth_water_top = 0;
 597
 598                 s16 nplaced = 0;
 599                 u32 i = vm->m_area.index(x, node_max.Y, z);
 600
 601                 content_t c_above = vm->m_data[i + em.X].getContent();
 602                 bool have_air = c_above == CONTENT_AIR;
 603
 604                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 605                         content_t c = vm->m_data[i].getContent();
 606
 607                         if (c != CONTENT_IGNORE && c != CONTENT_AIR &&
 608                                         (y == node_max.Y || have_air)) {
 609                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 610                                 dfiller = biome->depth_filler + noise_filler_depth->result[index];
 611                                 y0_top = biome->depth_top;
 612                                 y0_filler = biome->depth_top + dfiller;
 613                                 depth_water_top = biome->depth_water_top;
 614
 615                                 if (biome->c_stone == c_desert_stone)
 616                                         desert_stone = true;
 617                         }
 618
 619                         if (c == c_stone && have_air) {
 620                                 content_t c_below = vm->m_data[i - em.X].getContent();
 621
 622                                 if (c_below != CONTENT_AIR && c_below != c_water_source) {
 623                                         if (nplaced < y0_top) {
 624                                                 vm->m_data[i] = MapNode(biome->c_top);
 625                                                 nplaced++;
 626                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 627                                                 vm->m_data[i] = MapNode(biome->c_filler);
 628                                                 nplaced++;
 629                                         } else if (c == c_stone) {
 630                                                 have_air = false;
 631                                                 nplaced  = 0;
 632                                                 vm->m_data[i] = MapNode(biome->c_stone);
 633                                         } else {
 634                                                 have_air = false;
 635                                                 nplaced  = 0;
 636                                         }
 637                                 } else if (c == c_stone) {
 638                                         have_air = false;
 639                                         nplaced = 0;
 640                                         vm->m_data[i] = MapNode(biome->c_stone);
 641                                 }
 642                         } else if (c == c_stone) {
 643                                 have_air = false;
 644                                 nplaced = 0;
 645                                 vm->m_data[i] = MapNode(biome->c_stone);
 646                         } else if (c == c_water_source) {
 647                                 have_air = true;
 648                                 nplaced = 0;
 649                                 if (y > water_level - depth_water_top)
 650                                         vm->m_data[i] = MapNode(biome->c_water_top);
 651                                 else
 652                                         vm->m_data[i] = MapNode(biome->c_water);
 653                         } else if (c == CONTENT_AIR) {
 654                                 have_air = true;
 655                                 nplaced = 0;
 656                         }
 657
 658                         vm->m_area.add_y(em, i, -1);
 659                 }
 660         }
 661
 662         return desert_stone;
 663 }
 664
 665
 666 void MapgenV7::dustTopNodes()
 667 {
 668         if (node_max.Y < water_level)
 669                 return;
 670
 671         v3s16 em = vm->m_area.getExtent();
 672         u32 index = 0;
 673
 674         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 675         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 676                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 677
 678                 if (biome->c_dust == CONTENT_IGNORE)
 679                         continue;
 680
 681                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 682                 content_t c_full_max = vm->m_data[vi].getContent();
 683                 s16 y_start;
 684
 685                 if (c_full_max == CONTENT_AIR) {
 686                         y_start = full_node_max.Y - 1;
 687                 } else if (c_full_max == CONTENT_IGNORE) {
 688                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 689                         content_t c_max = vm->m_data[vi].getContent();
 690
 691                         if (c_max == CONTENT_AIR)
 692                                 y_start = node_max.Y;
 693                         else
 694                                 continue;
 695                 } else {
 696                         continue;
 697                 }
 698
 699                 vi = vm->m_area.index(x, y_start, z);
 700                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 701                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 702                                 break;
 703
 704                         vm->m_area.add_y(em, vi, -1);
 705                 }
 706
 707                 content_t c = vm->m_data[vi].getContent();
 708                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 709                         vm->m_area.add_y(em, vi, 1);
 710                         vm->m_data[vi] = MapNode(biome->c_dust);
 711                 }
 712         }
 713 }
 714
 715
 716 #if 0
 717 void MapgenV7::addTopNodes()
 718 {
 719         v3s16 em = vm->m_area.getExtent();
 720         s16 ntopnodes;
 721         u32 index = 0;
 722
 723         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 724         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 725                 Biome *biome = bmgr->biomes[biomemap[index]];
 726
 727                 //////////////////// First, add top nodes below the ridge
 728                 s16 y = ridge_heightmap[index];
 729
 730                 // This cutoff is good enough, but not perfect.
 731                 // It will cut off potentially placed top nodes at chunk boundaries
 732                 if (y < node_min.Y)
 733                         continue;
 734                 if (y > node_max.Y) {
 735                         y = node_max.Y; // Let's see if we can still go downward anyway
 736                         u32 vi = vm->m_area.index(x, y, z);
 737                         content_t c = vm->m_data[vi].getContent();
 738                         if (ndef->get(c).walkable)
 739                                 continue;
 740                 }
 741
 742                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 743                 // might not be the actual height, just the lowest part in the chunk
 744                 // where a ridge had been carved
 745                 u32 i = vm->m_area.index(x, y, z);
 746                 for (; y >= node_min.Y; y--) {
 747                         content_t c = vm->m_data[i].getContent();
 748                         if (ndef->get(c).walkable)
 749                                 break;
 750                         vm->m_area.add_y(em, i, -1);
 751                 }
 752
 753                 if (y != node_min.Y - 1 && y >= water_level) {
 754                         ridge_heightmap[index] = y; //update ridgeheight
 755                         ntopnodes = biome->top_depth;
 756                         for (; y <= node_max.Y && ntopnodes; y++) {
 757                                 ntopnodes--;
 758                                 vm->m_data[i] = MapNode(biome->c_top);
 759                                 vm->m_area.add_y(em, i, 1);
 760                         }
 761                         // If dirt, grow grass on it.
 762                         if (y > water_level - 10 &&
 763                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 764                                 vm->m_area.add_y(em, i, -1);
 765                                 if (vm->m_data[i].getContent() == c_dirt)
 766                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 767                         }
 768                 }
 769
 770                 //////////////////// Now, add top nodes on top of the ridge
 771                 y = heightmap[index];
 772                 if (y > node_max.Y) {
 773                         y = node_max.Y; // Let's see if we can still go downward anyway
 774                         u32 vi = vm->m_area.index(x, y, z);
 775                         content_t c = vm->m_data[vi].getContent();
 776                         if (ndef->get(c).walkable)
 777                                 continue;
 778                 }
 779
 780                 i = vm->m_area.index(x, y, z);
 781                 for (; y >= node_min.Y; y--) {
 782                         content_t c = vm->m_data[i].getContent();
 783                         if (ndef->get(c).walkable)
 784                                 break;
 785                         vm->m_area.add_y(em, i, -1);
 786                 }
 787
 788                 if (y != node_min.Y - 1) {
 789                         ntopnodes = biome->top_depth;
 790                         // Let's see if we've already added it...
 791                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 792                                 continue;
 793
 794                         for (; y <= node_max.Y && ntopnodes; y++) {
 795                                 ntopnodes--;
 796                                 vm->m_data[i] = MapNode(biome->c_top);
 797                                 vm->m_area.add_y(em, i, 1);
 798                         }
 799                         // If dirt, grow grass on it.
 800                         if (y > water_level - 10 &&
 801                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 802                                 vm->m_area.add_y(em, i, -1);
 803                                 if (vm->m_data[i].getContent() == c_dirt)
 804                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 805                         }
 806                 }
 807         }
 808 }
 809 #endif
 810
 811
 812 void MapgenV7::generateCaves(int max_stone_y)
 813 {
 814         if (max_stone_y >= node_min.Y) {
 815                 u32 index   = 0;
 816                 u32 index2d = 0;
 817
 818                 for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 819                         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 820                                 u32 i = vm->m_area.index(node_min.X, y, z);
 821                                 for (s16 x = node_min.X; x <= node_max.X;
 822                                                 x++, i++, index++, index2d++) {
 823                                         float d1 = contour(noise_cave1->result[index]);
 824                                         float d2 = contour(noise_cave2->result[index]);
 825                                         if (d1 * d2 > 0.3) {
 826                                                 Biome *biome = (Biome *)bmgr->
 827                                                                         getRaw(biomemap[index2d]);
 828                                                 content_t c = vm->m_data[i].getContent();
 829                                                 if (!ndef->get(c).is_ground_content ||
 830                                                                 c == CONTENT_AIR ||
 831                                                                 (y <= water_level &&
 832                                                                 c != biome->c_stone &&
 833                                                                 c != c_stone))
 834                                                         continue;
 835
 836                                                 vm->m_data[i] = MapNode(CONTENT_AIR);
 837                                         }
 838                                 }
 839                                 index2d -= ystride;
 840                         }
 841                         index2d += ystride;
 842                 }
 843         }
 844
 845         PseudoRandom ps(blockseed + 21343);
 846         u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
 847         for (u32 i = 0; i < bruises_count; i++) {
 848                 CaveV7 cave(this, &ps);
 849                 cave.makeCave(node_min, node_max, max_stone_y);
 850         }
 851 }
 852