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 "main.h" // For g_profiler
  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_v7.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_v7[] = {
  44         {"mountains", MGV7_MOUNTAINS},
  45         {"ridges",    MGV7_RIDGES},
  46         {NULL,        0}
  47 };
  48
  49 ///////////////////////////////////////////////////////////////////////////////
  50
  51
  52 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  53         : Mapgen(mapgenid, params, emerge)
  54 {
  55         this->m_emerge = emerge;
  56         this->bmgr     = emerge->biomemgr;
  57
  58         //// amount of elements to skip for the next index
  59         //// for noise/height/biome maps (not vmanip)
  60         this->ystride = csize.X;
  61         this->zstride = csize.X * csize.Y;
  62
  63         this->biomemap  = new u8[csize.X * csize.Z];
  64         this->heightmap = new s16[csize.X * csize.Z];
  65         this->ridge_heightmap = new s16[csize.X * csize.Z];
  66
  67         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  68         this->spflags = sp->spflags;
  69
  70         //// Terrain noise
  71         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  72         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  73         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  74         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  75         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  76         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  77         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  78
  79         //// 3d terrain noise
  80         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y, csize.Z);
  81         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y, csize.Z);
  82         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y, csize.Z);
  83         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y, csize.Z);
  84
  85         //// Biome noise
  86         noise_heat     = new Noise(&params->np_biome_heat,     seed, csize.X, csize.Z);
  87         noise_humidity = new Noise(&params->np_biome_humidity, seed, csize.X, csize.Z);
  88
  89         //// Resolve nodes to be used
  90         INodeDefManager *ndef = emerge->ndef;
  91
  92         c_stone           = ndef->getId("mapgen_stone");
  93         c_dirt            = ndef->getId("mapgen_dirt");
  94         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  95         c_sand            = ndef->getId("mapgen_sand");
  96         c_water_source    = ndef->getId("mapgen_water_source");
  97         c_lava_source     = ndef->getId("mapgen_lava_source");
  98         c_ice             = ndef->getId("default:ice");
  99         c_cobble          = ndef->getId("mapgen_cobble");
 100         c_desert_stone    = ndef->getId("mapgen_desert_stone");
 101         c_mossycobble     = ndef->getId("mapgen_mossycobble");
 102         c_sandbrick       = ndef->getId("mapgen_sandstonebrick");
 103         c_stair_cobble    = ndef->getId("mapgen_stair_cobble");
 104         c_stair_sandstone = ndef->getId("mapgen_stair_sandstone");
 105         if (c_ice == CONTENT_IGNORE)
 106                 c_ice = CONTENT_AIR;
 107         if (c_mossycobble == CONTENT_IGNORE)
 108                 c_mossycobble = c_cobble;
 109         if (c_sandbrick == CONTENT_IGNORE)
 110                 c_sandbrick = c_desert_stone;
 111         if (c_stair_cobble == CONTENT_IGNORE)
 112                 c_stair_cobble = c_cobble;
 113         if (c_stair_sandstone == CONTENT_IGNORE)
 114                 c_stair_sandstone = c_sandbrick;
 115 }
 116
 117
 118 MapgenV7::~MapgenV7()
 119 {
 120         delete noise_terrain_base;
 121         delete noise_terrain_persist;
 122         delete noise_height_select;
 123         delete noise_terrain_alt;
 124         delete noise_filler_depth;
 125         delete noise_mount_height;
 126         delete noise_ridge_uwater;
 127         delete noise_mountain;
 128         delete noise_ridge;
 129         delete noise_cave1;
 130         delete noise_cave2;
 131
 132         delete noise_heat;
 133         delete noise_humidity;
 134
 135         delete[] ridge_heightmap;
 136         delete[] heightmap;
 137         delete[] biomemap;
 138 }
 139
 140
 141 MapgenV7Params::MapgenV7Params()
 142 {
 143         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 144
 145         np_terrain_base    = NoiseParams(4,    70,  v3f(300, 300, 300), 82341, 6, 0.7,  2.0);
 146         np_terrain_alt     = NoiseParams(4,    25,  v3f(600, 600, 600), 5934,  5, 0.6,  2.0);
 147         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500, 500, 500), 539,   3, 0.6,  2.0);
 148         np_height_select   = NoiseParams(-0.5, 1,   v3f(250, 250, 250), 4213,  5, 0.69, 2.0);
 149         np_filler_depth    = NoiseParams(0,    1.2, v3f(150, 150, 150), 261,   4, 0.7,  2.0);
 150         np_mount_height    = NoiseParams(100,  30,  v3f(500, 500, 500), 72449, 4, 0.6,  2.0);
 151         np_ridge_uwater    = NoiseParams(0,    1,   v3f(500, 500, 500), 85039, 4, 0.6,  2.0);
 152         np_mountain        = NoiseParams(-0.6, 1,   v3f(250, 350, 250), 5333,  5, 0.68, 2.0);
 153         np_ridge           = NoiseParams(0,    1,   v3f(100, 100, 100), 6467,  4, 0.75, 2.0);
 154         np_cave1           = NoiseParams(0,    12,  v3f(100, 100, 100), 52534, 4, 0.5,  2.0);
 155         np_cave2           = NoiseParams(0,    12,  v3f(100, 100, 100), 10325, 4, 0.5,  2.0);
 156 }
 157
 158
 159 void MapgenV7Params::readParams(const Settings *settings)
 160 {
 161         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 162
 163         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 164         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 165         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 166         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 167         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 168         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 169         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 170         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 171         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 172         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 173         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 174 }
 175
 176
 177 void MapgenV7Params::writeParams(Settings *settings) const
 178 {
 179         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 180
 181         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 182         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 183         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 184         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 185         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 186         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 187         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 188         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 189         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 190         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 191         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 192 }
 193
 194
 195 ///////////////////////////////////////
 196
 197
 198 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 199 {
 200         // Base terrain calculation
 201         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 202
 203         // Ridge/river terrain calculation
 204         float width = 0.2;
 205         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 206         // actually computing the depth of the ridge is much more expensive;
 207         // if inside a river, simply guess
 208         if (fabs(uwatern) <= width)
 209                 return water_level - 10;
 210
 211         // Mountain terrain calculation
 212         int iters = 128; // don't even bother iterating more than 128 times..
 213         while (iters--) {
 214                 //current point would have been air
 215                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 216                         return y;
 217
 218                 y++;
 219         }
 220
 221         return y;
 222 }
 223
 224
 225 void MapgenV7::makeChunk(BlockMakeData *data)
 226 {
 227         // Pre-conditions
 228         assert(data->vmanip);
 229         assert(data->nodedef);
 230         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 231                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 232                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 233         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 234                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 235                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 236
 237         this->generating = true;
 238         this->vm   = data->vmanip;
 239         this->ndef = data->nodedef;
 240         //TimeTaker t("makeChunk");
 241
 242         v3s16 blockpos_min = data->blockpos_min;
 243         v3s16 blockpos_max = data->blockpos_max;
 244         node_min = blockpos_min * MAP_BLOCKSIZE;
 245         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 246         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 247         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 248
 249         blockseed = getBlockSeed2(full_node_min, seed);
 250
 251         // Make some noise
 252         calculateNoise();
 253
 254         // Generate base terrain, mountains, and ridges with initial heightmaps
 255         s16 stone_surface_max_y = generateTerrain();
 256
 257         // Create heightmap
 258         updateHeightmap(node_min, node_max);
 259
 260         // Create biomemap at heightmap surface
 261         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 262                 noise_humidity->result, heightmap, biomemap);
 263
 264         // Actually place the biome-specific nodes
 265         bool desert_stone = generateBiomes(noise_heat->result, noise_humidity->result);
 266
 267         if (flags & MG_CAVES)
 268                 generateCaves(stone_surface_max_y);
 269
 270         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 271                 DungeonParams dp;
 272
 273                 dp.np_rarity  = nparams_dungeon_rarity;
 274                 dp.np_density = nparams_dungeon_density;
 275                 dp.np_wetness = nparams_dungeon_wetness;
 276                 dp.c_water = c_water_source;
 277                 if (desert_stone) {
 278                         dp.c_cobble  = c_sandbrick;
 279                         dp.c_moss    = c_sandbrick; // should make this 'cracked sandstone' later
 280                         dp.c_stair   = c_stair_sandstone;
 281
 282                         dp.diagonal_dirs = true;
 283                         dp.mossratio  = 0.0;
 284                         dp.holesize   = v3s16(2, 3, 2);
 285                         dp.roomsize   = v3s16(2, 5, 2);
 286                         dp.notifytype = GENNOTIFY_TEMPLE;
 287                 } else {
 288                         dp.c_cobble  = c_cobble;
 289                         dp.c_moss    = c_mossycobble;
 290                         dp.c_stair   = c_stair_cobble;
 291
 292                         dp.diagonal_dirs = false;
 293                         dp.mossratio  = 3.0;
 294                         dp.holesize   = v3s16(1, 2, 1);
 295                         dp.roomsize   = v3s16(0, 0, 0);
 296                         dp.notifytype = GENNOTIFY_DUNGEON;
 297                 }
 298
 299                 DungeonGen dgen(this, &dp);
 300                 dgen.generate(blockseed, full_node_min, full_node_max);
 301         }
 302
 303         // Generate the registered decorations
 304         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 305
 306         // Generate the registered ores
 307         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 308
 309         // Sprinkle some dust on top after everything else was generated
 310         dustTopNodes();
 311
 312         //printf("makeChunk: %dms\n", t.stop());
 313
 314         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 315
 316         if (flags & MG_LIGHT)
 317                 calcLighting(node_min, node_max);
 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;
 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, z);
 493                 for (s16 y = node_min.Y; y <= node_max.Y; 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; y <= node_max.Y; 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; y <= node_max.Y; 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         MapNode n_air(CONTENT_AIR);
 587         MapNode n_stone(c_stone);
 588         MapNode n_water(c_water_source);
 589
 590         v3s16 em = vm->m_area.getExtent();
 591         u32 index = 0;
 592         bool desert_stone = false;
 593
 594         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 595         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 596                 Biome *biome = NULL;
 597                 s16 dfiller = 0;
 598                 s16 y0_top = 0;
 599                 s16 y0_filler = 0;
 600                 s16 depth_water_top = 0;
 601
 602                 s16 nplaced = 0;
 603                 u32 i = vm->m_area.index(x, node_max.Y, z);
 604
 605                 content_t c_above = vm->m_data[i + em.X].getContent();
 606                 bool have_air = c_above == CONTENT_AIR;
 607
 608                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 609                         content_t c = vm->m_data[i].getContent();
 610
 611                         // It could be the case that the elevation is equal to the chunk
 612                         // boundary, but the chunk above has not been generated yet
 613                         if (y == node_max.Y && c_above == CONTENT_IGNORE &&
 614                                 y == heightmap[index] && c == c_stone) {
 615                                 int j = (z - node_min.Z) * zstride +
 616                                                 (y - node_min.Y) * ystride +
 617                                                 (x - node_min.X);
 618                                 have_air = !getMountainTerrainFromMap(j, index, y);
 619                         }
 620
 621                         if (c != CONTENT_IGNORE && c != CONTENT_AIR && (y == node_max.Y || have_air)) {
 622                                 biome           = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 623                                 dfiller         = biome->depth_filler + noise_filler_depth->result[index];
 624                                 y0_top          = biome->depth_top;
 625                                 y0_filler       = biome->depth_top + dfiller;
 626                                 depth_water_top = biome->depth_water_top;
 627
 628                                 if (biome->c_stone == c_desert_stone)
 629                                         desert_stone = true;
 630                         }
 631
 632                         if (c == c_stone && have_air) {
 633                                 content_t c_below = vm->m_data[i - em.X].getContent();
 634
 635                                 if (c_below != CONTENT_AIR) {
 636                                         if (nplaced < y0_top) {
 637                                                 vm->m_data[i] = MapNode(biome->c_top);
 638                                                 nplaced++;
 639                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 640                                                 vm->m_data[i] = MapNode(biome->c_filler);
 641                                                 nplaced++;
 642                                         } else if (c == c_stone) {
 643                                                 have_air = false;
 644                                                 nplaced  = 0;
 645                                                 vm->m_data[i] = MapNode(biome->c_stone);
 646                                         } else {
 647                                                 have_air = false;
 648                                                 nplaced  = 0;
 649                                         }
 650                                 } else if (c == c_stone) {
 651                                         have_air = false;
 652                                         nplaced = 0;
 653                                         vm->m_data[i] = MapNode(biome->c_stone);
 654                                 }
 655                         } else if (c == c_stone) {
 656                                 have_air = false;
 657                                 nplaced = 0;
 658                                 vm->m_data[i] = MapNode(biome->c_stone);
 659                         } else if (c == c_water_source) {
 660                                 have_air = true;
 661                                 nplaced = 0;
 662                                 if (y > water_level - depth_water_top)
 663                                         vm->m_data[i] = MapNode(biome->c_water_top);
 664                                 else
 665                                         vm->m_data[i] = MapNode(biome->c_water);
 666                         } else if (c == CONTENT_AIR) {
 667                                 have_air = true;
 668                                 nplaced = 0;
 669                         }
 670
 671                         vm->m_area.add_y(em, i, -1);
 672                 }
 673         }
 674
 675         return desert_stone;
 676 }
 677
 678
 679 void MapgenV7::dustTopNodes()
 680 {
 681         if (node_max.Y < water_level)
 682                 return;
 683
 684         v3s16 em = vm->m_area.getExtent();
 685         u32 index = 0;
 686
 687         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 688         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 689                 Biome *biome = (Biome *)bmgr->get(biomemap[index]);
 690
 691                 if (biome->c_dust == CONTENT_IGNORE)
 692                         continue;
 693
 694                 s16 y_full_max = full_node_max.Y;
 695                 u32 vi_full_max = vm->m_area.index(x, y_full_max, z);
 696                 content_t c_full_max = vm->m_data[vi_full_max].getContent();
 697                 s16 y_start;
 698
 699                 if (c_full_max == CONTENT_AIR) {
 700                         y_start = y_full_max - 1;
 701                 } else if (c_full_max == CONTENT_IGNORE) {
 702                         s16 y_max = node_max.Y;
 703                         u32 vi_max = vm->m_area.index(x, y_max, z);
 704                         content_t c_max = vm->m_data[vi_max].getContent();
 705
 706                         if (c_max == CONTENT_AIR)
 707                                 y_start = y_max - 1;
 708                         else
 709                                 continue;
 710                 } else {
 711                         continue;
 712                 }
 713
 714                 u32 vi = vm->m_area.index(x, y_start, z);
 715                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 716                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 717                                 break;
 718
 719                         vm->m_area.add_y(em, vi, -1);
 720                 }
 721
 722                 content_t c = vm->m_data[vi].getContent();
 723                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 724                         vm->m_area.add_y(em, vi, 1);
 725                         vm->m_data[vi] = MapNode(biome->c_dust);
 726                 }
 727         }
 728 }
 729
 730
 731 #if 0
 732 void MapgenV7::addTopNodes()
 733 {
 734         v3s16 em = vm->m_area.getExtent();
 735         s16 ntopnodes;
 736         u32 index = 0;
 737
 738         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 739         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 740                 Biome *biome = bmgr->biomes[biomemap[index]];
 741
 742                 //////////////////// First, add top nodes below the ridge
 743                 s16 y = ridge_heightmap[index];
 744
 745                 // This cutoff is good enough, but not perfect.
 746                 // It will cut off potentially placed top nodes at chunk boundaries
 747                 if (y < node_min.Y)
 748                         continue;
 749                 if (y > node_max.Y) {
 750                         y = node_max.Y; // Let's see if we can still go downward anyway
 751                         u32 vi = vm->m_area.index(x, y, z);
 752                         content_t c = vm->m_data[vi].getContent();
 753                         if (ndef->get(c).walkable)
 754                                 continue;
 755                 }
 756
 757                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 758                 // might not be the actual height, just the lowest part in the chunk
 759                 // where a ridge had been carved
 760                 u32 i = vm->m_area.index(x, y, z);
 761                 for (; y >= node_min.Y; y--) {
 762                         content_t c = vm->m_data[i].getContent();
 763                         if (ndef->get(c).walkable)
 764                                 break;
 765                         vm->m_area.add_y(em, i, -1);
 766                 }
 767
 768                 if (y != node_min.Y - 1 && y >= water_level) {
 769                         ridge_heightmap[index] = y; //update ridgeheight
 770                         ntopnodes = biome->top_depth;
 771                         for (; y <= node_max.Y && ntopnodes; y++) {
 772                                 ntopnodes--;
 773                                 vm->m_data[i] = MapNode(biome->c_top);
 774                                 vm->m_area.add_y(em, i, 1);
 775                         }
 776                         // If dirt, grow grass on it.
 777                         if (y > water_level - 10 &&
 778                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 779                                 vm->m_area.add_y(em, i, -1);
 780                                 if (vm->m_data[i].getContent() == c_dirt)
 781                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 782                         }
 783                 }
 784
 785                 //////////////////// Now, add top nodes on top of the ridge
 786                 y = heightmap[index];
 787                 if (y > node_max.Y) {
 788                         y = node_max.Y; // Let's see if we can still go downward anyway
 789                         u32 vi = vm->m_area.index(x, y, z);
 790                         content_t c = vm->m_data[vi].getContent();
 791                         if (ndef->get(c).walkable)
 792                                 continue;
 793                 }
 794
 795                 i = vm->m_area.index(x, y, z);
 796                 for (; y >= node_min.Y; y--) {
 797                         content_t c = vm->m_data[i].getContent();
 798                         if (ndef->get(c).walkable)
 799                                 break;
 800                         vm->m_area.add_y(em, i, -1);
 801                 }
 802
 803                 if (y != node_min.Y - 1) {
 804                         ntopnodes = biome->top_depth;
 805                         // Let's see if we've already added it...
 806                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 807                                 continue;
 808
 809                         for (; y <= node_max.Y && ntopnodes; y++) {
 810                                 ntopnodes--;
 811                                 vm->m_data[i] = MapNode(biome->c_top);
 812                                 vm->m_area.add_y(em, i, 1);
 813                         }
 814                         // If dirt, grow grass on it.
 815                         if (y > water_level - 10 &&
 816                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 817                                 vm->m_area.add_y(em, i, -1);
 818                                 if (vm->m_data[i].getContent() == c_dirt)
 819                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 820                         }
 821                 }
 822         }
 823 }
 824 #endif
 825
 826
 827 void MapgenV7::generateCaves(int max_stone_y)
 828 {
 829         if (max_stone_y >= node_min.Y) {
 830                 u32 index   = 0;
 831                 u32 index2d = 0;
 832
 833                 for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 834                         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 835                                 u32 i = vm->m_area.index(node_min.X, y, z);
 836                                 for (s16 x = node_min.X; x <= node_max.X;
 837                                                 x++, i++, index++, index2d++) {
 838                                         Biome *biome = (Biome *)bmgr->get(biomemap[index2d]);
 839                                         content_t c = vm->m_data[i].getContent();
 840                                         if (c == CONTENT_AIR || (y <= water_level &&
 841                                                 c != biome->c_stone && c != c_stone))
 842                                                 continue;
 843
 844                                         float d1 = contour(noise_cave1->result[index]);
 845                                         float d2 = contour(noise_cave2->result[index]);
 846                                         if (d1 * d2 > 0.3)
 847                                                 vm->m_data[i] = MapNode(CONTENT_AIR);
 848                                 }
 849                                 index2d -= ystride;
 850                         }
 851                         index2d += ystride;
 852                 }
 853         }
 854
 855         PseudoRandom ps(blockseed + 21343);
 856         u32 bruises_count = (ps.range(1, 5) == 1) ? ps.range(1, 2) : 0;
 857         for (u32 i = 0; i < bruises_count; i++) {
 858                 CaveV7 cave(this, &ps);
 859                 cave.makeCave(node_min, node_max, max_stone_y);
 860         }
 861 }
 862