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         c_sandstone            = ndef->getId("mapgen_sandstone");
  97
  98         c_cobble               = ndef->getId("mapgen_cobble");
  99         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 100         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 101         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 102         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 103
 104         if (c_ice == CONTENT_IGNORE)
 105                 c_ice = CONTENT_AIR;
 106         if (c_mossycobble == CONTENT_IGNORE)
 107                 c_mossycobble = c_cobble;
 108         if (c_stair_cobble == CONTENT_IGNORE)
 109                 c_stair_cobble = c_cobble;
 110         if (c_sandstonebrick == CONTENT_IGNORE)
 111                 c_sandstonebrick = c_sandstone;
 112         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 113                 c_stair_sandstonebrick = c_sandstone;
 114 }
 115
 116
 117 MapgenV7::~MapgenV7()
 118 {
 119         delete noise_terrain_base;
 120         delete noise_terrain_persist;
 121         delete noise_height_select;
 122         delete noise_terrain_alt;
 123         delete noise_filler_depth;
 124         delete noise_mount_height;
 125         delete noise_ridge_uwater;
 126         delete noise_mountain;
 127         delete noise_ridge;
 128         delete noise_cave1;
 129         delete noise_cave2;
 130
 131         delete noise_heat;
 132         delete noise_humidity;
 133
 134         delete[] ridge_heightmap;
 135         delete[] heightmap;
 136         delete[] biomemap;
 137 }
 138
 139
 140 MapgenV7Params::MapgenV7Params()
 141 {
 142         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 143
 144         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 6, 0.7,  2.0);
 145         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 146         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500,  500,  500),  539,   3, 0.6,  2.0);
 147         np_height_select   = NoiseParams(-12,  24,  v3f(500,  500,  500),  4213,  6, 0.69, 2.0);
 148         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   4, 0.7,  2.0);
 149         np_mount_height    = NoiseParams(184,  72,  v3f(500,  500,  500),  72449, 4, 0.6,  2.0);
 150         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 151         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.68, 2.0);
 152         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 153         np_cave1           = NoiseParams(0,    12,  v3f(100,  100,  100),  52534, 4, 0.5,  2.0);
 154         np_cave2           = NoiseParams(0,    12,  v3f(100,  100,  100),  10325, 4, 0.5,  2.0);
 155 }
 156
 157
 158 void MapgenV7Params::readParams(const Settings *settings)
 159 {
 160         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 161
 162         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 163         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 164         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 165         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 166         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 167         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 168         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 169         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 170         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 171         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 172         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 173 }
 174
 175
 176 void MapgenV7Params::writeParams(Settings *settings) const
 177 {
 178         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 179
 180         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 181         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 182         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 183         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 184         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 185         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 186         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 187         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 188         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 189         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 190         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 191 }
 192
 193
 194 ///////////////////////////////////////
 195
 196
 197 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 198 {
 199         // Base terrain calculation
 200         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 201
 202         // Ridge/river terrain calculation
 203         float width = 0.2;
 204         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 205         // actually computing the depth of the ridge is much more expensive;
 206         // if inside a river, simply guess
 207         if (fabs(uwatern) <= width)
 208                 return water_level - 10;
 209
 210         // Mountain terrain calculation
 211         int iters = 128; // don't even bother iterating more than 128 times..
 212         while (iters--) {
 213                 //current point would have been air
 214                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 215                         return y;
 216
 217                 y++;
 218         }
 219
 220         return y;
 221 }
 222
 223
 224 void MapgenV7::makeChunk(BlockMakeData *data)
 225 {
 226         // Pre-conditions
 227         assert(data->vmanip);
 228         assert(data->nodedef);
 229         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 230                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 231                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 232         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 233                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 234                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 235
 236         this->generating = true;
 237         this->vm   = data->vmanip;
 238         this->ndef = data->nodedef;
 239         //TimeTaker t("makeChunk");
 240
 241         v3s16 blockpos_min = data->blockpos_min;
 242         v3s16 blockpos_max = data->blockpos_max;
 243         node_min = blockpos_min * MAP_BLOCKSIZE;
 244         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 245         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 246         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 247
 248         blockseed = getBlockSeed2(full_node_min, seed);
 249
 250         // Make some noise
 251         calculateNoise();
 252
 253         // Generate base terrain, mountains, and ridges with initial heightmaps
 254         s16 stone_surface_max_y = generateTerrain();
 255
 256         // Create heightmap
 257         updateHeightmap(node_min, node_max);
 258
 259         // Create biomemap at heightmap surface
 260         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 261                 noise_humidity->result, heightmap, biomemap);
 262
 263         // Actually place the biome-specific nodes
 264         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 265
 266         if (flags & MG_CAVES)
 267                 generateCaves(stone_surface_max_y);
 268
 269         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 270                 DungeonParams dp;
 271
 272                 dp.np_rarity  = nparams_dungeon_rarity;
 273                 dp.np_density = nparams_dungeon_density;
 274                 dp.np_wetness = nparams_dungeon_wetness;
 275                 dp.c_water    = c_water_source;
 276                 if (stone_type == STONE) {
 277                         dp.c_cobble = c_cobble;
 278                         dp.c_moss   = c_mossycobble;
 279                         dp.c_stair  = c_stair_cobble;
 280
 281                         dp.diagonal_dirs = false;
 282                         dp.mossratio     = 3.0;
 283                         dp.holesize      = v3s16(1, 2, 1);
 284                         dp.roomsize      = v3s16(0, 0, 0);
 285                         dp.notifytype    = GENNOTIFY_DUNGEON;
 286                 } else if (stone_type == DESERT_STONE) {
 287                         dp.c_cobble = c_desert_stone;
 288                         dp.c_moss   = c_desert_stone;
 289                         dp.c_stair  = c_desert_stone;
 290
 291                         dp.diagonal_dirs = true;
 292                         dp.mossratio     = 0.0;
 293                         dp.holesize      = v3s16(2, 3, 2);
 294                         dp.roomsize      = v3s16(2, 5, 2);
 295                         dp.notifytype    = GENNOTIFY_TEMPLE;
 296                 } else if (stone_type == SANDSTONE) {
 297                         dp.c_cobble = c_sandstonebrick;
 298                         dp.c_moss   = c_sandstonebrick;
 299                         dp.c_stair  = c_sandstonebrick;
 300
 301                         dp.diagonal_dirs = false;
 302                         dp.mossratio     = 0.0;
 303                         dp.holesize      = v3s16(2, 2, 2);
 304                         dp.roomsize      = v3s16(2, 0, 2);
 305                         dp.notifytype    = GENNOTIFY_DUNGEON;
 306                 }
 307
 308                 DungeonGen dgen(this, &dp);
 309                 dgen.generate(blockseed, full_node_min, full_node_max);
 310         }
 311
 312         // Generate the registered decorations
 313         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 314
 315         // Generate the registered ores
 316         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 317
 318         // Sprinkle some dust on top after everything else was generated
 319         dustTopNodes();
 320
 321         //printf("makeChunk: %dms\n", t.stop());
 322
 323         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 324
 325         if (flags & MG_LIGHT)
 326                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 327                         full_node_min, full_node_max);
 328
 329         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 330         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 331
 332         this->generating = false;
 333 }
 334
 335
 336 void MapgenV7::calculateNoise()
 337 {
 338         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 339         int x = node_min.X;
 340         int y = node_min.Y - 1;
 341         int z = node_min.Z;
 342
 343         noise_terrain_persist->perlinMap2D(x, z);
 344         float *persistmap = noise_terrain_persist->result;
 345
 346         noise_terrain_base->perlinMap2D(x, z, persistmap);
 347         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 348         noise_height_select->perlinMap2D(x, z);
 349
 350         if (flags & MG_CAVES) {
 351                 noise_cave1->perlinMap3D(x, y, z);
 352                 noise_cave2->perlinMap3D(x, y, z);
 353         }
 354
 355         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 356                 noise_ridge->perlinMap3D(x, y, z);
 357                 noise_ridge_uwater->perlinMap2D(x, z);
 358         }
 359
 360         if ((spflags & MGV7_MOUNTAINS) && node_max.Y >= 0) {
 361                 noise_mountain->perlinMap3D(x, y, z);
 362                 noise_mount_height->perlinMap2D(x, z);
 363         }
 364
 365         noise_filler_depth->perlinMap2D(x, z);
 366         noise_heat->perlinMap2D(x, z);
 367         noise_humidity->perlinMap2D(x, z);
 368         //printf("calculateNoise: %dus\n", t.stop());
 369 }
 370
 371
 372 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 373 {
 374         float heat      = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed);
 375         float humidity  = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed);
 376         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 377
 378         return bmgr->getBiome(heat, humidity, groundlevel);
 379 }
 380
 381 //needs to be updated
 382 float MapgenV7::baseTerrainLevelAtPoint(int x, int z)
 383 {
 384         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 385         hselect = rangelim(hselect, 0.0, 1.0);
 386
 387         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 388
 389         noise_terrain_base->np.persist = persist;
 390         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 391
 392         noise_terrain_alt->np.persist = persist;
 393         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 394
 395         if (height_alt > height_base)
 396                 return height_alt;
 397
 398         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 399 }
 400
 401
 402 float MapgenV7::baseTerrainLevelFromMap(int index)
 403 {
 404         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 405         float height_base = noise_terrain_base->result[index];
 406         float height_alt  = noise_terrain_alt->result[index];
 407
 408         if (height_alt > height_base)
 409                 return height_alt;
 410
 411         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 412 }
 413
 414
 415 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z)
 416 {
 417         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 418         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 419         return mnt_n * mnt_h_n >= (float)y;
 420 }
 421
 422
 423 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y)
 424 {
 425         float mounthn = noise_mount_height->result[idx_xz];
 426         float mountn = noise_mountain->result[idx_xyz];
 427         return mountn * mounthn >= (float)y;
 428 }
 429
 430
 431 #if 0
 432 void MapgenV7::carveRivers() {
 433         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 434         MapNode n_stone(c_stone);
 435         u32 index = 0;
 436
 437         int river_depth = 4;
 438
 439         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 440         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 441                 float terrain_mod  = noise_terrain_mod->result[index];
 442                 NoiseParams *np = noise_terrain_river->np;
 443                 np.persist = noise_terrain_persist->result[index];
 444                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 445                 float height = terrain_river * (1 - abs(terrain_mod)) *
 446                                                 noise_terrain_river->np.scale;
 447                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 448
 449                 s16 y = heightmap[index];
 450                 if (height < 1.0 && y > river_depth &&
 451                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 452
 453                         for (s16 ry = y; ry != y - river_depth; ry--) {
 454                                 u32 vi = vm->m_area.index(x, ry, z);
 455                                 vm->m_data[vi] = n_air;
 456                         }
 457
 458                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 459                         vm->m_data[vi] = n_water_source;
 460                 }
 461         }
 462 }
 463 #endif
 464
 465
 466 int MapgenV7::generateTerrain()
 467 {
 468         int ymax = generateBaseTerrain();
 469
 470         if (spflags & MGV7_MOUNTAINS)
 471                 ymax = generateMountainTerrain(ymax);
 472
 473         if (spflags & MGV7_RIDGES)
 474                 generateRidgeTerrain();
 475
 476         return ymax;
 477 }
 478
 479
 480 int MapgenV7::generateBaseTerrain()
 481 {
 482         MapNode n_air(CONTENT_AIR);
 483         MapNode n_stone(c_stone);
 484         MapNode n_water(c_water_source);
 485
 486         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 487         v3s16 em = vm->m_area.getExtent();
 488         u32 index = 0;
 489
 490         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 491         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 492                 float surface_height = baseTerrainLevelFromMap(index);
 493                 s16 surface_y = (s16)surface_height;
 494
 495                 heightmap[index]       = surface_y;
 496                 ridge_heightmap[index] = surface_y;
 497
 498                 if (surface_y > stone_surface_max_y)
 499                         stone_surface_max_y = surface_y;
 500
 501                 u32 i = vm->m_area.index(x, node_min.Y - 1, z);
 502                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 503                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 504                                 if (y <= surface_y)
 505                                         vm->m_data[i] = n_stone;
 506                                 else if (y <= water_level)
 507                                         vm->m_data[i] = n_water;
 508                                 else
 509                                         vm->m_data[i] = n_air;
 510                         }
 511                         vm->m_area.add_y(em, i, 1);
 512                 }
 513         }
 514
 515         return stone_surface_max_y;
 516 }
 517
 518
 519 int MapgenV7::generateMountainTerrain(int ymax)
 520 {
 521         if (node_max.Y < 0)
 522                 return ymax;
 523
 524         MapNode n_stone(c_stone);
 525         u32 j = 0;
 526
 527         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 528         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 529                 u32 vi = vm->m_area.index(node_min.X, y, z);
 530                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 531                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 532                         content_t c = vm->m_data[vi].getContent();
 533
 534                         if (getMountainTerrainFromMap(j, index, y)
 535                                         && (c == CONTENT_AIR || c == c_water_source)) {
 536                                 vm->m_data[vi] = n_stone;
 537                                 if (y > ymax)
 538                                         ymax = y;
 539                         }
 540
 541                         vi++;
 542                         j++;
 543                 }
 544         }
 545
 546         return ymax;
 547 }
 548
 549
 550 void MapgenV7::generateRidgeTerrain()
 551 {
 552         if (node_max.Y < water_level)
 553                 return;
 554
 555         MapNode n_water(c_water_source);
 556         MapNode n_air(CONTENT_AIR);
 557         u32 index = 0;
 558         float width = 0.2; // TODO: figure out acceptable perlin noise values
 559
 560         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 561         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 562                 u32 vi = vm->m_area.index(node_min.X, y, z);
 563                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 564                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 565
 566                         if (heightmap[j] < water_level - 16)
 567                                 continue;
 568
 569                         float uwatern = noise_ridge_uwater->result[j] * 2;
 570                         if (fabs(uwatern) > width)
 571                                 continue;
 572
 573                         float altitude = y - water_level;
 574                         float height_mod = (altitude + 17) / 2.5;
 575                         float width_mod  = width - fabs(uwatern);
 576                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 577
 578                         if (nridge + width_mod * height_mod < 0.6)
 579                                 continue;
 580
 581                         if (y < ridge_heightmap[j])
 582                                 ridge_heightmap[j] = y - 1;
 583
 584                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 585                 }
 586         }
 587 }
 588
 589
 590 MgStoneType MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 591 {
 592         v3s16 em = vm->m_area.getExtent();
 593         u32 index = 0;
 594         MgStoneType stone_type = STONE;
 595
 596         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 597         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 598                 Biome *biome = NULL;
 599                 u16 depth_top = 0;
 600                 u16 base_filler = 0;
 601                 u16 depth_water_top = 0;
 602                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 603
 604                 // Check node at base of mapchunk above, either a node of a previously
 605                 // generated mapchunk or if not, a node of overgenerated base terrain.
 606                 content_t c_above = vm->m_data[vi + em.X].getContent();
 607                 bool air_above = c_above == CONTENT_AIR;
 608                 bool water_above = c_above == c_water_source;
 609
 610                 // If there is air or water above enable top/filler placement, otherwise force
 611                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 612                 u16 nplaced = (air_above || water_above) ? 0 : (u16)-1;
 613
 614                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 615                         content_t c = vm->m_data[vi].getContent();
 616
 617                         // Biome is recalculated each time an upper surface is detected while
 618                         // working down a column. The selected biome then remains in effect for
 619                         // all nodes below until the next surface and biome recalculation.
 620                         // Biome is recalculated:
 621                         // 1. At the surface of stone below air or water.
 622                         // 2. At the surface of water below air.
 623                         // 3. When stone or water is detected but biome has not yet been calculated.
 624                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 625                                         (c == c_water_source && (air_above || !biome))) {
 626                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 627                                 depth_top = biome->depth_top;
 628                                 base_filler = MYMAX(depth_top + biome->depth_filler
 629                                                 + noise_filler_depth->result[index], 0);
 630                                 depth_water_top = biome->depth_water_top;
 631
 632                                 // Detect stone type for dungeons during every biome calculation.
 633                                 // This is more efficient than detecting per-node and will not
 634                                 // miss any desert stone or sandstone biomes.
 635                                 if (biome->c_stone == c_desert_stone)
 636                                         stone_type = DESERT_STONE;
 637                                 else if (biome->c_stone == c_sandstone)
 638                                         stone_type = SANDSTONE;
 639                         }
 640
 641                         if (c == c_stone) {
 642                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 643
 644                                 // If the node below isn't solid, make this node stone, so that
 645                                 // any top/filler nodes above are structurally supported.
 646                                 // This is done by aborting the cycle of top/filler placement
 647                                 // immediately by forcing nplaced to stone level.
 648                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 649                                         nplaced = (u16)-1;
 650
 651                                 if (nplaced < depth_top) {
 652                                         vm->m_data[vi] = MapNode(biome->c_top);
 653                                         nplaced++;
 654                                 } else if (nplaced < base_filler) {
 655                                         vm->m_data[vi] = MapNode(biome->c_filler);
 656                                         nplaced++;
 657                                 } else {
 658                                         vm->m_data[vi] = MapNode(biome->c_stone);
 659                                 }
 660
 661                                 air_above = false;
 662                                 water_above = false;
 663                         } else if (c == c_water_source) {
 664                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 665                                                 biome->c_water_top : biome->c_water);
 666                                 nplaced = 0;  // Enable top/filler placement for next surface
 667                                 air_above = false;
 668                                 water_above = true;
 669                         } else if (c == CONTENT_AIR) {
 670                                 nplaced = 0;  // Enable top/filler placement for next surface
 671                                 air_above = true;
 672                                 water_above = false;
 673                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 674                                 nplaced = (u16)-1;  // Disable top/filler placement
 675                                 air_above = false;
 676                                 water_above = false;
 677                         }
 678
 679                         vm->m_area.add_y(em, vi, -1);
 680                 }
 681         }
 682
 683         return stone_type;
 684 }
 685
 686
 687 void MapgenV7::dustTopNodes()
 688 {
 689         if (node_max.Y < water_level)
 690                 return;
 691
 692         v3s16 em = vm->m_area.getExtent();
 693         u32 index = 0;
 694
 695         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 696         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 697                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 698
 699                 if (biome->c_dust == CONTENT_IGNORE)
 700                         continue;
 701
 702                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 703                 content_t c_full_max = vm->m_data[vi].getContent();
 704                 s16 y_start;
 705
 706                 if (c_full_max == CONTENT_AIR) {
 707                         y_start = full_node_max.Y - 1;
 708                 } else if (c_full_max == CONTENT_IGNORE) {
 709                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 710                         content_t c_max = vm->m_data[vi].getContent();
 711
 712                         if (c_max == CONTENT_AIR)
 713                                 y_start = node_max.Y;
 714                         else
 715                                 continue;
 716                 } else {
 717                         continue;
 718                 }
 719
 720                 vi = vm->m_area.index(x, y_start, z);
 721                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 722                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 723                                 break;
 724
 725                         vm->m_area.add_y(em, vi, -1);
 726                 }
 727
 728                 content_t c = vm->m_data[vi].getContent();
 729                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 730                         vm->m_area.add_y(em, vi, 1);
 731                         vm->m_data[vi] = MapNode(biome->c_dust);
 732                 }
 733         }
 734 }
 735
 736
 737 #if 0
 738 void MapgenV7::addTopNodes()
 739 {
 740         v3s16 em = vm->m_area.getExtent();
 741         s16 ntopnodes;
 742         u32 index = 0;
 743
 744         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 745         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 746                 Biome *biome = bmgr->biomes[biomemap[index]];
 747
 748                 //////////////////// First, add top nodes below the ridge
 749                 s16 y = ridge_heightmap[index];
 750
 751                 // This cutoff is good enough, but not perfect.
 752                 // It will cut off potentially placed top nodes at chunk boundaries
 753                 if (y < node_min.Y)
 754                         continue;
 755                 if (y > node_max.Y) {
 756                         y = node_max.Y; // Let's see if we can still go downward anyway
 757                         u32 vi = vm->m_area.index(x, y, z);
 758                         content_t c = vm->m_data[vi].getContent();
 759                         if (ndef->get(c).walkable)
 760                                 continue;
 761                 }
 762
 763                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 764                 // might not be the actual height, just the lowest part in the chunk
 765                 // where a ridge had been carved
 766                 u32 i = vm->m_area.index(x, y, z);
 767                 for (; y >= node_min.Y; y--) {
 768                         content_t c = vm->m_data[i].getContent();
 769                         if (ndef->get(c).walkable)
 770                                 break;
 771                         vm->m_area.add_y(em, i, -1);
 772                 }
 773
 774                 if (y != node_min.Y - 1 && y >= water_level) {
 775                         ridge_heightmap[index] = y; //update ridgeheight
 776                         ntopnodes = biome->top_depth;
 777                         for (; y <= node_max.Y && ntopnodes; y++) {
 778                                 ntopnodes--;
 779                                 vm->m_data[i] = MapNode(biome->c_top);
 780                                 vm->m_area.add_y(em, i, 1);
 781                         }
 782                         // If dirt, grow grass on it.
 783                         if (y > water_level - 10 &&
 784                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 785                                 vm->m_area.add_y(em, i, -1);
 786                                 if (vm->m_data[i].getContent() == c_dirt)
 787                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 788                         }
 789                 }
 790
 791                 //////////////////// Now, add top nodes on top of the ridge
 792                 y = heightmap[index];
 793                 if (y > node_max.Y) {
 794                         y = node_max.Y; // Let's see if we can still go downward anyway
 795                         u32 vi = vm->m_area.index(x, y, z);
 796                         content_t c = vm->m_data[vi].getContent();
 797                         if (ndef->get(c).walkable)
 798                                 continue;
 799                 }
 800
 801                 i = vm->m_area.index(x, y, z);
 802                 for (; y >= node_min.Y; y--) {
 803                         content_t c = vm->m_data[i].getContent();
 804                         if (ndef->get(c).walkable)
 805                                 break;
 806                         vm->m_area.add_y(em, i, -1);
 807                 }
 808
 809                 if (y != node_min.Y - 1) {
 810                         ntopnodes = biome->top_depth;
 811                         // Let's see if we've already added it...
 812                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 813                                 continue;
 814
 815                         for (; y <= node_max.Y && ntopnodes; y++) {
 816                                 ntopnodes--;
 817                                 vm->m_data[i] = MapNode(biome->c_top);
 818                                 vm->m_area.add_y(em, i, 1);
 819                         }
 820                         // If dirt, grow grass on it.
 821                         if (y > water_level - 10 &&
 822                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 823                                 vm->m_area.add_y(em, i, -1);
 824                                 if (vm->m_data[i].getContent() == c_dirt)
 825                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 826                         }
 827                 }
 828         }
 829 }
 830 #endif
 831
 832
 833 void MapgenV7::generateCaves(int max_stone_y)
 834 {
 835         if (max_stone_y >= node_min.Y) {
 836                 u32 index   = 0;
 837                 u32 index2d = 0;
 838
 839                 for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 840                         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 841                                 u32 i = vm->m_area.index(node_min.X, y, z);
 842                                 for (s16 x = node_min.X; x <= node_max.X;
 843                                                 x++, i++, index++, index2d++) {
 844                                         float d1 = contour(noise_cave1->result[index]);
 845                                         float d2 = contour(noise_cave2->result[index]);
 846                                         if (d1 * d2 > 0.3) {
 847                                                 Biome *biome = (Biome *)bmgr->
 848                                                                         getRaw(biomemap[index2d]);
 849                                                 content_t c = vm->m_data[i].getContent();
 850                                                 if (!ndef->get(c).is_ground_content ||
 851                                                                 c == CONTENT_AIR ||
 852                                                                 (y <= water_level &&
 853                                                                 c != biome->c_stone &&
 854                                                                 c != c_stone))
 855                                                         continue;
 856
 857                                                 vm->m_data[i] = MapNode(CONTENT_AIR);
 858                                         }
 859                                 }
 860                                 index2d -= ystride;
 861                         }
 862                         index2d += ystride;
 863                 }
 864         }
 865
 866         PseudoRandom ps(blockseed + 21343);
 867         u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
 868         for (u32 i = 0; i < bruises_count; i++) {
 869                 CaveV7 cave(this, &ps);
 870                 cave.makeCave(node_min, node_max, max_stone_y);
 871         }
 872 }
 873