src/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2010-2015 paramat, Matt Gregory
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21
  22 #include "mapgen.h"
  23 #include "voxel.h"
  24 #include "noise.h"
  25 #include "mapblock.h"
  26 #include "mapnode.h"
  27 #include "map.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "voxelalgorithms.h"
  31 //#include "profiler.h" // For TimeTaker
  32 #include "settings.h" // For g_settings
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.h"
  36 #include "treegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_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
  53 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  54         : Mapgen(mapgenid, params, emerge)
  55 {
  56         this->m_emerge = emerge;
  57         this->bmgr     = emerge->biomemgr;
  58
  59         //// amount of elements to skip for the next index
  60         //// for noise/height/biome maps (not vmanip)
  61         this->ystride = csize.X;
  62         this->zstride = csize.X * (csize.Y + 2);
  63
  64         this->biomemap        = new u8[csize.X * csize.Z];
  65         this->heightmap       = new s16[csize.X * csize.Z];
  66         this->heatmap         = NULL;
  67         this->humidmap        = NULL;
  68         this->ridge_heightmap = new s16[csize.X * csize.Z];
  69
  70         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  71         this->spflags = sp->spflags;
  72
  73         //// Terrain noise
  74         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  75         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  76         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  77         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  78         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  79         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  80         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  81
  82         //// 3d terrain noise
  83         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  84         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  85         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y + 2, csize.Z);
  86         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y + 2, csize.Z);
  87
  88         //// Biome noise
  89         noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
  90         noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
  91         noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
  92         noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
  93
  94         //// Resolve nodes to be used
  95         INodeDefManager *ndef = emerge->ndef;
  96
  97         c_stone                = ndef->getId("mapgen_stone");
  98         c_water_source         = ndef->getId("mapgen_water_source");
  99         c_lava_source          = ndef->getId("mapgen_lava_source");
 100         c_desert_stone         = ndef->getId("mapgen_desert_stone");
 101         c_ice                  = ndef->getId("mapgen_ice");
 102         c_sandstone            = ndef->getId("mapgen_sandstone");
 103
 104         c_cobble               = ndef->getId("mapgen_cobble");
 105         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 106         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 107         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 108         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 109
 110         if (c_ice == CONTENT_IGNORE)
 111                 c_ice = CONTENT_AIR;
 112         if (c_mossycobble == CONTENT_IGNORE)
 113                 c_mossycobble = c_cobble;
 114         if (c_stair_cobble == CONTENT_IGNORE)
 115                 c_stair_cobble = c_cobble;
 116         if (c_sandstonebrick == CONTENT_IGNORE)
 117                 c_sandstonebrick = c_sandstone;
 118         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 119                 c_stair_sandstonebrick = c_sandstone;
 120 }
 121
 122
 123 MapgenV7::~MapgenV7()
 124 {
 125         delete noise_terrain_base;
 126         delete noise_terrain_persist;
 127         delete noise_height_select;
 128         delete noise_terrain_alt;
 129         delete noise_filler_depth;
 130         delete noise_mount_height;
 131         delete noise_ridge_uwater;
 132         delete noise_mountain;
 133         delete noise_ridge;
 134         delete noise_cave1;
 135         delete noise_cave2;
 136
 137         delete noise_heat;
 138         delete noise_humidity;
 139         delete noise_heat_blend;
 140         delete noise_humidity_blend;
 141
 142         delete[] ridge_heightmap;
 143         delete[] heightmap;
 144         delete[] biomemap;
 145 }
 146
 147
 148 MapgenV7Params::MapgenV7Params()
 149 {
 150         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 151
 152         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 153         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 154         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 155         np_height_select   = NoiseParams(-12,  24,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 156         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 157         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 158         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 159         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 160         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 161         np_cave1           = NoiseParams(0,    12,  v3f(96,   96,   96),   52534, 4, 0.5,  2.0);
 162         np_cave2           = NoiseParams(0,    12,  v3f(96,   96,   96),   10325, 4, 0.5,  2.0);
 163 }
 164
 165
 166 void MapgenV7Params::readParams(const Settings *settings)
 167 {
 168         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 169
 170         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 171         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 172         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 173         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 174         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 175         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 176         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 177         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 178         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 179         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 180         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 181 }
 182
 183
 184 void MapgenV7Params::writeParams(Settings *settings) const
 185 {
 186         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, U32_MAX);
 187
 188         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 189         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 190         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 191         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 192         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 193         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 194         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 195         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 196         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 197         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 198         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 199 }
 200
 201
 202 ///////////////////////////////////////
 203
 204
 205 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 206 {
 207         // Base terrain calculation
 208         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 209
 210         // Ridge/river terrain calculation
 211         float width = 0.2;
 212         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 213         // actually computing the depth of the ridge is much more expensive;
 214         // if inside a river, simply guess
 215         if (fabs(uwatern) <= width)
 216                 return water_level - 10;
 217
 218         // Mountain terrain calculation
 219         int iters = 128; // don't even bother iterating more than 128 times..
 220         while (iters--) {
 221                 //current point would have been air
 222                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 223                         return y;
 224
 225                 y++;
 226         }
 227
 228         return y;
 229 }
 230
 231
 232 void MapgenV7::makeChunk(BlockMakeData *data)
 233 {
 234         // Pre-conditions
 235         assert(data->vmanip);
 236         assert(data->nodedef);
 237         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 238                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 239                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 240         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 241                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 242                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 243
 244         this->generating = true;
 245         this->vm   = data->vmanip;
 246         this->ndef = data->nodedef;
 247         //TimeTaker t("makeChunk");
 248
 249         v3s16 blockpos_min = data->blockpos_min;
 250         v3s16 blockpos_max = data->blockpos_max;
 251         node_min = blockpos_min * MAP_BLOCKSIZE;
 252         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 253         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 254         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 255
 256         blockseed = getBlockSeed2(full_node_min, seed);
 257
 258         // Make some noise
 259         calculateNoise();
 260
 261         // Generate base terrain, mountains, and ridges with initial heightmaps
 262         s16 stone_surface_max_y = generateTerrain();
 263
 264         // Create heightmap
 265         updateHeightmap(node_min, node_max);
 266
 267         // Create biomemap at heightmap surface
 268         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 269                 noise_humidity->result, heightmap, biomemap);
 270
 271         // Actually place the biome-specific nodes
 272         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 273
 274         if (flags & MG_CAVES)
 275                 generateCaves(stone_surface_max_y);
 276
 277         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 278                 DungeonParams dp;
 279
 280                 dp.np_rarity  = nparams_dungeon_rarity;
 281                 dp.np_density = nparams_dungeon_density;
 282                 dp.np_wetness = nparams_dungeon_wetness;
 283                 dp.c_water    = c_water_source;
 284                 if (stone_type == STONE) {
 285                         dp.c_cobble = c_cobble;
 286                         dp.c_moss   = c_mossycobble;
 287                         dp.c_stair  = c_stair_cobble;
 288
 289                         dp.diagonal_dirs = false;
 290                         dp.mossratio     = 3.0;
 291                         dp.holesize      = v3s16(1, 2, 1);
 292                         dp.roomsize      = v3s16(0, 0, 0);
 293                         dp.notifytype    = GENNOTIFY_DUNGEON;
 294                 } else if (stone_type == DESERT_STONE) {
 295                         dp.c_cobble = c_desert_stone;
 296                         dp.c_moss   = c_desert_stone;
 297                         dp.c_stair  = c_desert_stone;
 298
 299                         dp.diagonal_dirs = true;
 300                         dp.mossratio     = 0.0;
 301                         dp.holesize      = v3s16(2, 3, 2);
 302                         dp.roomsize      = v3s16(2, 5, 2);
 303                         dp.notifytype    = GENNOTIFY_TEMPLE;
 304                 } else if (stone_type == SANDSTONE) {
 305                         dp.c_cobble = c_sandstonebrick;
 306                         dp.c_moss   = c_sandstonebrick;
 307                         dp.c_stair  = c_sandstonebrick;
 308
 309                         dp.diagonal_dirs = false;
 310                         dp.mossratio     = 0.0;
 311                         dp.holesize      = v3s16(2, 2, 2);
 312                         dp.roomsize      = v3s16(2, 0, 2);
 313                         dp.notifytype    = GENNOTIFY_DUNGEON;
 314                 }
 315
 316                 DungeonGen dgen(this, &dp);
 317                 dgen.generate(blockseed, full_node_min, full_node_max);
 318         }
 319
 320         // Generate the registered decorations
 321         if (flags & MG_DECORATIONS)
 322                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 323
 324         // Generate the registered ores
 325         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 326
 327         // Sprinkle some dust on top after everything else was generated
 328         dustTopNodes();
 329
 330         //printf("makeChunk: %dms\n", t.stop());
 331
 332         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 333
 334         if (flags & MG_LIGHT)
 335                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 336                         full_node_min, full_node_max);
 337
 338         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 339         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 340
 341         this->generating = false;
 342 }
 343
 344
 345 void MapgenV7::calculateNoise()
 346 {
 347         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 348         int x = node_min.X;
 349         int y = node_min.Y - 1;
 350         int z = node_min.Z;
 351
 352         noise_terrain_persist->perlinMap2D(x, z);
 353         float *persistmap = noise_terrain_persist->result;
 354
 355         noise_terrain_base->perlinMap2D(x, z, persistmap);
 356         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 357         noise_height_select->perlinMap2D(x, z);
 358
 359         if (flags & MG_CAVES) {
 360                 noise_cave1->perlinMap3D(x, y, z);
 361                 noise_cave2->perlinMap3D(x, y, z);
 362         }
 363
 364         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 365                 noise_ridge->perlinMap3D(x, y, z);
 366                 noise_ridge_uwater->perlinMap2D(x, z);
 367         }
 368
 369         // Mountain noises are calculated in generateMountainTerrain()
 370
 371         noise_filler_depth->perlinMap2D(x, z);
 372         noise_heat->perlinMap2D(x, z);
 373         noise_humidity->perlinMap2D(x, z);
 374         noise_heat_blend->perlinMap2D(x, z);
 375         noise_humidity_blend->perlinMap2D(x, z);
 376
 377         for (s32 i = 0; i < csize.X * csize.Z; i++) {
 378                 noise_heat->result[i] += noise_heat_blend->result[i];
 379                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 380         }
 381
 382         heatmap = noise_heat->result;
 383         humidmap = noise_humidity->result;
 384         //printf("calculateNoise: %dus\n", t.stop());
 385 }
 386
 387
 388 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 389 {
 390         float heat = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed) +
 391                 NoisePerlin2D(&noise_heat_blend->np, p.X, p.Z, seed);
 392         float humidity = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed) +
 393                 NoisePerlin2D(&noise_humidity_blend->np, p.X, p.Z, seed);
 394         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 395
 396         return bmgr->getBiome(heat, humidity, groundlevel);
 397 }
 398
 399 //needs to be updated
 400 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 401 {
 402         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 403         hselect = rangelim(hselect, 0.0, 1.0);
 404
 405         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 406
 407         noise_terrain_base->np.persist = persist;
 408         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 409
 410         noise_terrain_alt->np.persist = persist;
 411         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 412
 413         if (height_alt > height_base)
 414                 return height_alt;
 415
 416         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 417 }
 418
 419
 420 float MapgenV7::baseTerrainLevelFromMap(int index)
 421 {
 422         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 423         float height_base = noise_terrain_base->result[index];
 424         float height_alt  = noise_terrain_alt->result[index];
 425
 426         if (height_alt > height_base)
 427                 return height_alt;
 428
 429         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 430 }
 431
 432
 433 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 434 {
 435         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 436         float density_gradient = -((float)y / mnt_h_n);
 437         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 438
 439         return mnt_n + density_gradient >= 0.0;
 440 }
 441
 442
 443 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 444 {
 445         float mounthn = noise_mount_height->result[idx_xz];
 446         float density_gradient = -((float)y / mounthn);
 447         float mountn = noise_mountain->result[idx_xyz];
 448
 449         return mountn + density_gradient >= 0.0;
 450 }
 451
 452
 453 #if 0
 454 void MapgenV7::carveRivers() {
 455         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 456         MapNode n_stone(c_stone);
 457         u32 index = 0;
 458
 459         int river_depth = 4;
 460
 461         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 462         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 463                 float terrain_mod  = noise_terrain_mod->result[index];
 464                 NoiseParams *np = noise_terrain_river->np;
 465                 np.persist = noise_terrain_persist->result[index];
 466                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 467                 float height = terrain_river * (1 - abs(terrain_mod)) *
 468                                                 noise_terrain_river->np.scale;
 469                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 470
 471                 s16 y = heightmap[index];
 472                 if (height < 1.0 && y > river_depth &&
 473                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 474
 475                         for (s16 ry = y; ry != y - river_depth; ry--) {
 476                                 u32 vi = vm->m_area.index(x, ry, z);
 477                                 vm->m_data[vi] = n_air;
 478                         }
 479
 480                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 481                         vm->m_data[vi] = n_water_source;
 482                 }
 483         }
 484 }
 485 #endif
 486
 487
 488 int MapgenV7::generateTerrain()
 489 {
 490         s16 stone_surface_min_y;
 491         s16 stone_surface_max_y;
 492
 493         generateBaseTerrain(&stone_surface_min_y, &stone_surface_max_y);
 494
 495         if ((spflags & MGV7_MOUNTAINS) && stone_surface_min_y < node_max.Y)
 496                 stone_surface_max_y = generateMountainTerrain(stone_surface_max_y);
 497
 498         if (spflags & MGV7_RIDGES)
 499                 generateRidgeTerrain();
 500
 501         return stone_surface_max_y;
 502 }
 503
 504
 505 void MapgenV7::generateBaseTerrain(s16 *stone_surface_min_y, s16 *stone_surface_max_y)
 506 {
 507         MapNode n_air(CONTENT_AIR);
 508         MapNode n_stone(c_stone);
 509         MapNode n_water(c_water_source);
 510
 511         v3s16 em = vm->m_area.getExtent();
 512         s16 surface_min_y = MAX_MAP_GENERATION_LIMIT;
 513         s16 surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 514         u32 index = 0;
 515
 516         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 517         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 518                 float surface_height = baseTerrainLevelFromMap(index);
 519                 s16 surface_y = (s16)surface_height;
 520
 521                 heightmap[index]       = surface_y;
 522                 ridge_heightmap[index] = surface_y;
 523
 524                 if (surface_y < surface_min_y)
 525                         surface_min_y = surface_y;
 526
 527                 if (surface_y > surface_max_y)
 528                         surface_max_y = surface_y;
 529
 530                 u32 i = vm->m_area.index(x, node_min.Y - 1, z);
 531                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 532                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 533                                 if (y <= surface_y)
 534                                         vm->m_data[i] = n_stone;
 535                                 else if (y <= water_level)
 536                                         vm->m_data[i] = n_water;
 537                                 else
 538                                         vm->m_data[i] = n_air;
 539                         }
 540                         vm->m_area.add_y(em, i, 1);
 541                 }
 542         }
 543
 544         *stone_surface_min_y = surface_min_y;
 545         *stone_surface_max_y = surface_max_y;
 546 }
 547
 548
 549 int MapgenV7::generateMountainTerrain(s16 ymax)
 550 {
 551         noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 552         noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 553
 554         MapNode n_stone(c_stone);
 555         u32 j = 0;
 556
 557         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 558         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 559                 u32 vi = vm->m_area.index(node_min.X, y, z);
 560                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 561                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 562                         content_t c = vm->m_data[vi].getContent();
 563
 564                         if (getMountainTerrainFromMap(j, index, y)
 565                                         && (c == CONTENT_AIR || c == c_water_source)) {
 566                                 vm->m_data[vi] = n_stone;
 567                                 if (y > ymax)
 568                                         ymax = y;
 569                         }
 570
 571                         vi++;
 572                         j++;
 573                 }
 574         }
 575
 576         return ymax;
 577 }
 578
 579
 580 void MapgenV7::generateRidgeTerrain()
 581 {
 582         if (node_max.Y < water_level)
 583                 return;
 584
 585         MapNode n_water(c_water_source);
 586         MapNode n_air(CONTENT_AIR);
 587         u32 index = 0;
 588         float width = 0.2; // TODO: figure out acceptable perlin noise values
 589
 590         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 591         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 592                 u32 vi = vm->m_area.index(node_min.X, y, z);
 593                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 594                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 595
 596                         if (heightmap[j] < water_level - 16)
 597                                 continue;
 598
 599                         float uwatern = noise_ridge_uwater->result[j] * 2;
 600                         if (fabs(uwatern) > width)
 601                                 continue;
 602
 603                         float altitude = y - water_level;
 604                         float height_mod = (altitude + 17) / 2.5;
 605                         float width_mod  = width - fabs(uwatern);
 606                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 607
 608                         if (nridge + width_mod * height_mod < 0.6)
 609                                 continue;
 610
 611                         if (y < ridge_heightmap[j])
 612                                 ridge_heightmap[j] = y - 1;
 613
 614                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 615                 }
 616         }
 617 }
 618
 619
 620 MgStoneType MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 621 {
 622         v3s16 em = vm->m_area.getExtent();
 623         u32 index = 0;
 624         MgStoneType stone_type = STONE;
 625
 626         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 627         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 628                 Biome *biome = NULL;
 629                 u16 depth_top = 0;
 630                 u16 base_filler = 0;
 631                 u16 depth_water_top = 0;
 632                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 633
 634                 // Check node at base of mapchunk above, either a node of a previously
 635                 // generated mapchunk or if not, a node of overgenerated base terrain.
 636                 content_t c_above = vm->m_data[vi + em.X].getContent();
 637                 bool air_above = c_above == CONTENT_AIR;
 638                 bool water_above = c_above == c_water_source;
 639
 640                 // If there is air or water above enable top/filler placement, otherwise force
 641                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 642                 u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
 643
 644                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 645                         content_t c = vm->m_data[vi].getContent();
 646
 647                         // Biome is recalculated each time an upper surface is detected while
 648                         // working down a column. The selected biome then remains in effect for
 649                         // all nodes below until the next surface and biome recalculation.
 650                         // Biome is recalculated:
 651                         // 1. At the surface of stone below air or water.
 652                         // 2. At the surface of water below air.
 653                         // 3. When stone or water is detected but biome has not yet been calculated.
 654                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 655                                         (c == c_water_source && (air_above || !biome))) {
 656                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 657                                 depth_top = biome->depth_top;
 658                                 base_filler = MYMAX(depth_top + biome->depth_filler
 659                                                 + noise_filler_depth->result[index], 0);
 660                                 depth_water_top = biome->depth_water_top;
 661
 662                                 // Detect stone type for dungeons during every biome calculation.
 663                                 // This is more efficient than detecting per-node and will not
 664                                 // miss any desert stone or sandstone biomes.
 665                                 if (biome->c_stone == c_desert_stone)
 666                                         stone_type = DESERT_STONE;
 667                                 else if (biome->c_stone == c_sandstone)
 668                                         stone_type = SANDSTONE;
 669                         }
 670
 671                         if (c == c_stone) {
 672                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 673
 674                                 // If the node below isn't solid, make this node stone, so that
 675                                 // any top/filler nodes above are structurally supported.
 676                                 // This is done by aborting the cycle of top/filler placement
 677                                 // immediately by forcing nplaced to stone level.
 678                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 679                                         nplaced = U16_MAX;
 680
 681                                 if (nplaced < depth_top) {
 682                                         vm->m_data[vi] = MapNode(biome->c_top);
 683                                         nplaced++;
 684                                 } else if (nplaced < base_filler) {
 685                                         vm->m_data[vi] = MapNode(biome->c_filler);
 686                                         nplaced++;
 687                                 } else {
 688                                         vm->m_data[vi] = MapNode(biome->c_stone);
 689                                 }
 690
 691                                 air_above = false;
 692                                 water_above = false;
 693                         } else if (c == c_water_source) {
 694                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 695                                                 biome->c_water_top : biome->c_water);
 696                                 nplaced = 0;  // Enable top/filler placement for next surface
 697                                 air_above = false;
 698                                 water_above = true;
 699                         } else if (c == CONTENT_AIR) {
 700                                 nplaced = 0;  // Enable top/filler placement for next surface
 701                                 air_above = true;
 702                                 water_above = false;
 703                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 704                                 nplaced = U16_MAX;  // Disable top/filler placement
 705                                 air_above = false;
 706                                 water_above = false;
 707                         }
 708
 709                         vm->m_area.add_y(em, vi, -1);
 710                 }
 711         }
 712
 713         return stone_type;
 714 }
 715
 716
 717 void MapgenV7::dustTopNodes()
 718 {
 719         if (node_max.Y < water_level)
 720                 return;
 721
 722         v3s16 em = vm->m_area.getExtent();
 723         u32 index = 0;
 724
 725         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 726         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 727                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 728
 729                 if (biome->c_dust == CONTENT_IGNORE)
 730                         continue;
 731
 732                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 733                 content_t c_full_max = vm->m_data[vi].getContent();
 734                 s16 y_start;
 735
 736                 if (c_full_max == CONTENT_AIR) {
 737                         y_start = full_node_max.Y - 1;
 738                 } else if (c_full_max == CONTENT_IGNORE) {
 739                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 740                         content_t c_max = vm->m_data[vi].getContent();
 741
 742                         if (c_max == CONTENT_AIR)
 743                                 y_start = node_max.Y;
 744                         else
 745                                 continue;
 746                 } else {
 747                         continue;
 748                 }
 749
 750                 vi = vm->m_area.index(x, y_start, z);
 751                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 752                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 753                                 break;
 754
 755                         vm->m_area.add_y(em, vi, -1);
 756                 }
 757
 758                 content_t c = vm->m_data[vi].getContent();
 759                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 760                         vm->m_area.add_y(em, vi, 1);
 761                         vm->m_data[vi] = MapNode(biome->c_dust);
 762                 }
 763         }
 764 }
 765
 766
 767 #if 0
 768 void MapgenV7::addTopNodes()
 769 {
 770         v3s16 em = vm->m_area.getExtent();
 771         s16 ntopnodes;
 772         u32 index = 0;
 773
 774         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 775         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 776                 Biome *biome = bmgr->biomes[biomemap[index]];
 777
 778                 //////////////////// First, add top nodes below the ridge
 779                 s16 y = ridge_heightmap[index];
 780
 781                 // This cutoff is good enough, but not perfect.
 782                 // It will cut off potentially placed top nodes at chunk boundaries
 783                 if (y < node_min.Y)
 784                         continue;
 785                 if (y > node_max.Y) {
 786                         y = node_max.Y; // Let's see if we can still go downward anyway
 787                         u32 vi = vm->m_area.index(x, y, z);
 788                         content_t c = vm->m_data[vi].getContent();
 789                         if (ndef->get(c).walkable)
 790                                 continue;
 791                 }
 792
 793                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 794                 // might not be the actual height, just the lowest part in the chunk
 795                 // where a ridge had been carved
 796                 u32 i = vm->m_area.index(x, y, z);
 797                 for (; y >= node_min.Y; y--) {
 798                         content_t c = vm->m_data[i].getContent();
 799                         if (ndef->get(c).walkable)
 800                                 break;
 801                         vm->m_area.add_y(em, i, -1);
 802                 }
 803
 804                 if (y != node_min.Y - 1 && y >= water_level) {
 805                         ridge_heightmap[index] = y; //update ridgeheight
 806                         ntopnodes = biome->top_depth;
 807                         for (; y <= node_max.Y && ntopnodes; y++) {
 808                                 ntopnodes--;
 809                                 vm->m_data[i] = MapNode(biome->c_top);
 810                                 vm->m_area.add_y(em, i, 1);
 811                         }
 812                         // If dirt, grow grass on it.
 813                         if (y > water_level - 10 &&
 814                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 815                                 vm->m_area.add_y(em, i, -1);
 816                                 if (vm->m_data[i].getContent() == c_dirt)
 817                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 818                         }
 819                 }
 820
 821                 //////////////////// Now, add top nodes on top of the ridge
 822                 y = heightmap[index];
 823                 if (y > node_max.Y) {
 824                         y = node_max.Y; // Let's see if we can still go downward anyway
 825                         u32 vi = vm->m_area.index(x, y, z);
 826                         content_t c = vm->m_data[vi].getContent();
 827                         if (ndef->get(c).walkable)
 828                                 continue;
 829                 }
 830
 831                 i = vm->m_area.index(x, y, z);
 832                 for (; y >= node_min.Y; y--) {
 833                         content_t c = vm->m_data[i].getContent();
 834                         if (ndef->get(c).walkable)
 835                                 break;
 836                         vm->m_area.add_y(em, i, -1);
 837                 }
 838
 839                 if (y != node_min.Y - 1) {
 840                         ntopnodes = biome->top_depth;
 841                         // Let's see if we've already added it...
 842                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 843                                 continue;
 844
 845                         for (; y <= node_max.Y && ntopnodes; y++) {
 846                                 ntopnodes--;
 847                                 vm->m_data[i] = MapNode(biome->c_top);
 848                                 vm->m_area.add_y(em, i, 1);
 849                         }
 850                         // If dirt, grow grass on it.
 851                         if (y > water_level - 10 &&
 852                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 853                                 vm->m_area.add_y(em, i, -1);
 854                                 if (vm->m_data[i].getContent() == c_dirt)
 855                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 856                         }
 857                 }
 858         }
 859 }
 860 #endif
 861
 862
 863 void MapgenV7::generateCaves(s16 max_stone_y)
 864 {
 865         if (max_stone_y >= node_min.Y) {
 866                 v3s16 em = vm->m_area.getExtent();
 867                 u32 index2d = 0;
 868                 u32 index3d;
 869
 870                 for (s16 z = node_min.Z; z <= node_max.Z; z++)
 871                 for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 872                         bool open = false;  // Is column open to overground
 873                         u32 vi = vm->m_area.index(x, node_max.Y + 1, z);
 874                         index3d = (z - node_min.Z) * zstride + (csize.Y + 1) * ystride +
 875                                 (x - node_min.X);
 876                         // Biome of column
 877                         Biome *biome = (Biome *)bmgr->getRaw(biomemap[index2d]);
 878
 879                         for (s16 y = node_max.Y + 1; y >= node_min.Y - 1;
 880                                         y--, index3d -= ystride, vm->m_area.add_y(em, vi, -1)) {
 881                                 content_t c = vm->m_data[vi].getContent();
 882                                 if (c == CONTENT_AIR || c == biome->c_water_top ||
 883                                                 c == biome->c_water) {
 884                                         open = true;
 885                                         continue;
 886                                 }
 887                                 // Ground
 888                                 float d1 = contour(noise_cave1->result[index3d]);
 889                                 float d2 = contour(noise_cave2->result[index3d]);
 890                                 if (d1 * d2 > 0.3f && ndef->get(c).is_ground_content) {
 891                                         // In tunnel and ground content, excavate
 892                                         vm->m_data[vi] = MapNode(CONTENT_AIR);
 893                                 } else if (open && (c == biome->c_filler || c == biome->c_stone)) {
 894                                         // Tunnel entrance floor
 895                                         vm->m_data[vi] = MapNode(biome->c_top);
 896                                         open = false;
 897                                 } else {
 898                                         open = false;
 899                                 }
 900                         }
 901                 }
 902         }
 903
 904         PseudoRandom ps(blockseed + 21343);
 905         u32 bruises_count = ps.range(0, 2);
 906         for (u32 i = 0; i < bruises_count; i++) {
 907                 CaveV7 cave(this, &ps);
 908                 cave.makeCave(node_min, node_max, max_stone_y);
 909         }
 910 }