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         // 1-up 1-down overgeneration
  63         this->zstride_1u1d = csize.X * (csize.Y + 2);
  64         // 1-down overgeneration
  65         this->zstride_1d = csize.X * (csize.Y + 1);
  66
  67         this->heightmap       = new s16[csize.X * csize.Z];
  68         this->ridge_heightmap = new s16[csize.X * csize.Z];
  69
  70         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  71
  72         this->spflags    = sp->spflags;
  73         this->cave_width = sp->cave_width;
  74
  75         //// Terrain noise
  76         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  77         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  78         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  79         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  80         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  81         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  82         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  83
  84         //// 3d terrain noise
  85         // 1-up 1-down overgeneration
  86         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  87         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  88         // 1-down overgeneraion
  89         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y + 1, csize.Z);
  90         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y + 1, csize.Z);
  91
  92         // TODO(hmmmm): should we have a way to disable biomemanager biomes?
  93         //// Initialize biome generator
  94         biomegen = emerge->biomemgr->createBiomeGen(
  95                 BIOMEGEN_ORIGINAL, params->bparams, csize);
  96         biomemap = biomegen->biomemap;
  97
  98         //// Resolve nodes to be used
  99         c_stone                = ndef->getId("mapgen_stone");
 100         c_water_source         = ndef->getId("mapgen_water_source");
 101         c_lava_source          = ndef->getId("mapgen_lava_source");
 102         c_desert_stone         = ndef->getId("mapgen_desert_stone");
 103         c_ice                  = ndef->getId("mapgen_ice");
 104         c_sandstone            = ndef->getId("mapgen_sandstone");
 105
 106         c_cobble               = ndef->getId("mapgen_cobble");
 107         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 108         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 109         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 110         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 111
 112         if (c_ice == CONTENT_IGNORE)
 113                 c_ice = CONTENT_AIR;
 114         if (c_mossycobble == CONTENT_IGNORE)
 115                 c_mossycobble = c_cobble;
 116         if (c_stair_cobble == CONTENT_IGNORE)
 117                 c_stair_cobble = c_cobble;
 118         if (c_sandstonebrick == CONTENT_IGNORE)
 119                 c_sandstonebrick = c_sandstone;
 120         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 121                 c_stair_sandstonebrick = c_sandstone;
 122 }
 123
 124
 125 MapgenV7::~MapgenV7()
 126 {
 127         delete noise_terrain_base;
 128         delete noise_terrain_persist;
 129         delete noise_height_select;
 130         delete noise_terrain_alt;
 131         delete noise_filler_depth;
 132         delete noise_mount_height;
 133         delete noise_ridge_uwater;
 134         delete noise_mountain;
 135         delete noise_ridge;
 136         delete noise_cave1;
 137         delete noise_cave2;
 138
 139         delete biomegen;
 140
 141         delete[] ridge_heightmap;
 142         delete[] heightmap;
 143 }
 144
 145
 146 MapgenV7Params::MapgenV7Params()
 147 {
 148         spflags    = MGV7_MOUNTAINS | MGV7_RIDGES;
 149         cave_width = 0.3;
 150
 151         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 152         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 153         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 154         np_height_select   = NoiseParams(-8,   16,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 155         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 156         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 157         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 158         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 159         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 160         np_cave1           = NoiseParams(0,    12,  v3f(96,   96,   96),   52534, 4, 0.5,  2.0);
 161         np_cave2           = NoiseParams(0,    12,  v3f(96,   96,   96),   10325, 4, 0.5,  2.0);
 162 }
 163
 164
 165 void MapgenV7Params::readParams(const Settings *settings)
 166 {
 167         settings->getFlagStrNoEx("mgv7_spflags",  spflags, flagdesc_mapgen_v7);
 168         settings->getFloatNoEx("mgv7_cave_width", cave_width);
 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         settings->setFloat("mgv7_cave_width", cave_width);
 188
 189         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 190         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 191         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 192         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 193         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 194         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 195         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 196         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 197         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 198         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 199         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 200 }
 201
 202
 203 ///////////////////////////////////////////////////////////////////////////////
 204
 205
 206 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 207 {
 208         // Base terrain calculation
 209         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 210
 211         // Ridge/river terrain calculation
 212         float width = 0.2;
 213         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 214         // if inside a river this is an unsuitable spawn point
 215         if (fabs(uwatern) <= width)
 216                 return MAX_MAP_GENERATION_LIMIT;
 217
 218         // Mountain terrain calculation
 219         int iters = 128;
 220         while (iters--) {
 221                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // Air, y is ground level
 222                         if (y <= water_level || y > water_level + 16)
 223                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 224                         else
 225                                 return y;
 226                 }
 227                 y++;
 228         }
 229
 230         // Unsuitable spawn point, no ground surface found
 231         return MAX_MAP_GENERATION_LIMIT;
 232 }
 233
 234
 235 void MapgenV7::makeChunk(BlockMakeData *data)
 236 {
 237         // Pre-conditions
 238         assert(data->vmanip);
 239         assert(data->nodedef);
 240         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 241                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 242                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 243         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 244                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 245                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 246
 247         this->generating = true;
 248         this->vm   = data->vmanip;
 249         this->ndef = data->nodedef;
 250         //TimeTaker t("makeChunk");
 251
 252         v3s16 blockpos_min = data->blockpos_min;
 253         v3s16 blockpos_max = data->blockpos_max;
 254         node_min = blockpos_min * MAP_BLOCKSIZE;
 255         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 256         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 257         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 258
 259         blockseed = getBlockSeed2(full_node_min, seed);
 260
 261         // Make some noise
 262         calculateNoise();
 263
 264         // Generate terrain and ridges with initial heightmaps
 265         s16 stone_surface_max_y = generateTerrain();
 266
 267         if (spflags & MGV7_RIDGES)
 268                 generateRidgeTerrain();
 269
 270         // Update heightmap to include mountain terrain
 271         updateHeightmap(node_min, node_max);
 272
 273         // Init biome generator, place biome-specific nodes, and build biomemap
 274         biomegen->calcBiomeNoise(node_min);
 275         biomegen->getBiomes(heightmap);
 276         MgStoneType stone_type = generateBiomes();
 277
 278         if (flags & MG_CAVES)
 279                 generateCaves(stone_surface_max_y);
 280
 281         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 282                 DungeonParams dp;
 283
 284                 dp.np_rarity  = nparams_dungeon_rarity;
 285                 dp.np_density = nparams_dungeon_density;
 286                 dp.np_wetness = nparams_dungeon_wetness;
 287                 dp.c_water    = c_water_source;
 288                 if (stone_type == STONE) {
 289                         dp.c_cobble = c_cobble;
 290                         dp.c_moss   = c_mossycobble;
 291                         dp.c_stair  = c_stair_cobble;
 292
 293                         dp.diagonal_dirs = false;
 294                         dp.mossratio     = 3.0;
 295                         dp.holesize      = v3s16(1, 2, 1);
 296                         dp.roomsize      = v3s16(0, 0, 0);
 297                         dp.notifytype    = GENNOTIFY_DUNGEON;
 298                 } else if (stone_type == DESERT_STONE) {
 299                         dp.c_cobble = c_desert_stone;
 300                         dp.c_moss   = c_desert_stone;
 301                         dp.c_stair  = c_desert_stone;
 302
 303                         dp.diagonal_dirs = true;
 304                         dp.mossratio     = 0.0;
 305                         dp.holesize      = v3s16(2, 3, 2);
 306                         dp.roomsize      = v3s16(2, 5, 2);
 307                         dp.notifytype    = GENNOTIFY_TEMPLE;
 308                 } else if (stone_type == SANDSTONE) {
 309                         dp.c_cobble = c_sandstonebrick;
 310                         dp.c_moss   = c_sandstonebrick;
 311                         dp.c_stair  = c_sandstonebrick;
 312
 313                         dp.diagonal_dirs = false;
 314                         dp.mossratio     = 0.0;
 315                         dp.holesize      = v3s16(2, 2, 2);
 316                         dp.roomsize      = v3s16(2, 0, 2);
 317                         dp.notifytype    = GENNOTIFY_DUNGEON;
 318                 }
 319
 320                 DungeonGen dgen(this, &dp);
 321                 dgen.generate(blockseed, full_node_min, full_node_max);
 322         }
 323
 324         // Generate the registered decorations
 325         if (flags & MG_DECORATIONS)
 326                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 327
 328         // Generate the registered ores
 329         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 330
 331         // Sprinkle some dust on top after everything else was generated
 332         dustTopNodes();
 333
 334         //printf("makeChunk: %dms\n", t.stop());
 335
 336         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 337
 338         if (flags & MG_LIGHT)
 339                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 340                         full_node_min, full_node_max);
 341
 342         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 343         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 344
 345         this->generating = false;
 346 }
 347
 348
 349 void MapgenV7::calculateNoise()
 350 {
 351         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 352         s16 x = node_min.X;
 353         s16 y = node_min.Y - 1;
 354         s16 z = node_min.Z;
 355
 356         noise_terrain_persist->perlinMap2D(x, z);
 357         float *persistmap = noise_terrain_persist->result;
 358
 359         noise_terrain_base->perlinMap2D(x, z, persistmap);
 360         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 361         noise_height_select->perlinMap2D(x, z);
 362
 363         if (spflags & MGV7_MOUNTAINS) {
 364                 noise_mountain->perlinMap3D(x, y, z);
 365                 noise_mount_height->perlinMap2D(x, z);
 366         }
 367
 368         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 369                 noise_ridge->perlinMap3D(x, y, z);
 370                 noise_ridge_uwater->perlinMap2D(x, z);
 371         }
 372
 373         // Cave noises are calculated in generateCaves()
 374         // only if solid terrain is present in mapchunk
 375
 376         //printf("calculateNoise: %dus\n", t.stop());
 377 }
 378
 379
 380 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 381 {
 382         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 383         hselect = rangelim(hselect, 0.0, 1.0);
 384
 385         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 386
 387         noise_terrain_base->np.persist = persist;
 388         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 389
 390         noise_terrain_alt->np.persist = persist;
 391         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 392
 393         if (height_alt > height_base)
 394                 return height_alt;
 395
 396         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 397 }
 398
 399
 400 float MapgenV7::baseTerrainLevelFromMap(int index)
 401 {
 402         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 403         float height_base = noise_terrain_base->result[index];
 404         float height_alt  = noise_terrain_alt->result[index];
 405
 406         if (height_alt > height_base)
 407                 return height_alt;
 408
 409         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 410 }
 411
 412
 413 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 414 {
 415         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 416         float density_gradient = -((float)y / mnt_h_n);
 417         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 418
 419         return mnt_n + density_gradient >= 0.0;
 420 }
 421
 422
 423 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 424 {
 425         float mounthn = noise_mount_height->result[idx_xz];
 426         float density_gradient = -((float)y / mounthn);
 427         float mountn = noise_mountain->result[idx_xyz];
 428
 429         return mountn + density_gradient >= 0.0;
 430 }
 431
 432
 433 int MapgenV7::generateTerrain()
 434 {
 435         MapNode n_air(CONTENT_AIR);
 436         MapNode n_stone(c_stone);
 437         MapNode n_water(c_water_source);
 438
 439         v3s16 em = vm->m_area.getExtent();
 440         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 441         u32 index2d = 0;
 442         bool mountain_flag = spflags & MGV7_MOUNTAINS;
 443
 444         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 445         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 446                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 447                 heightmap[index2d]       = surface_y;  // Create base terrain heightmap
 448                 ridge_heightmap[index2d] = surface_y;
 449
 450                 if (surface_y > stone_surface_max_y)
 451                         stone_surface_max_y = surface_y;
 452
 453                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 454                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 455
 456                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 457                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 458                                 if (y <= surface_y) {
 459                                         vm->m_data[vi] = n_stone;  // Base terrain
 460                                 } else if (mountain_flag &&
 461                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 462                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 463                                         if (y > stone_surface_max_y)
 464                                                 stone_surface_max_y = y;
 465                                 } else if (y <= water_level) {
 466                                         vm->m_data[vi] = n_water;
 467                                 } else {
 468                                         vm->m_data[vi] = n_air;
 469                                 }
 470                         }
 471                         vm->m_area.add_y(em, vi, 1);
 472                         index3d += ystride;
 473                 }
 474         }
 475
 476         return stone_surface_max_y;
 477 }
 478
 479
 480 void MapgenV7::generateRidgeTerrain()
 481 {
 482         if (node_max.Y < water_level - 16)
 483                 return;
 484
 485         MapNode n_water(c_water_source);
 486         MapNode n_air(CONTENT_AIR);
 487         u32 index = 0;
 488         float width = 0.2;
 489
 490         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 491         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 492                 u32 vi = vm->m_area.index(node_min.X, y, z);
 493                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 494                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 495
 496                         if (heightmap[j] < water_level - 16)  // Use base terrain heightmap
 497                                 continue;
 498
 499                         float uwatern = noise_ridge_uwater->result[j] * 2;
 500                         if (fabs(uwatern) > width)
 501                                 continue;
 502
 503                         float altitude = y - water_level;
 504                         float height_mod = (altitude + 17) / 2.5;
 505                         float width_mod  = width - fabs(uwatern);
 506                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 507
 508                         if (nridge + width_mod * height_mod < 0.6)
 509                                 continue;
 510
 511                         if (y < ridge_heightmap[j])
 512                                 ridge_heightmap[j] = y - 1;
 513
 514                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 515                 }
 516         }
 517 }
 518
 519
 520 MgStoneType MapgenV7::generateBiomes()
 521 {
 522         v3s16 em = vm->m_area.getExtent();
 523         u32 index = 0;
 524         MgStoneType stone_type = STONE;
 525
 526         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 527         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 528                 Biome *biome = NULL;
 529                 u16 depth_top = 0;
 530                 u16 base_filler = 0;
 531                 u16 depth_water_top = 0;
 532                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 533
 534                 // Check node at base of mapchunk above, either a node of a previously
 535                 // generated mapchunk or if not, a node of overgenerated base terrain.
 536                 content_t c_above = vm->m_data[vi + em.X].getContent();
 537                 bool air_above = c_above == CONTENT_AIR;
 538                 bool water_above = c_above == c_water_source;
 539
 540                 // If there is air or water above enable top/filler placement, otherwise force
 541                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 542                 u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
 543
 544                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 545                         content_t c = vm->m_data[vi].getContent();
 546
 547                         // Biome is recalculated each time an upper surface is detected while
 548                         // working down a column. The selected biome then remains in effect for
 549                         // all nodes below until the next surface and biome recalculation.
 550                         // Biome is recalculated:
 551                         // 1. At the surface of stone below air or water.
 552                         // 2. At the surface of water below air.
 553                         // 3. When stone or water is detected but biome has not yet been calculated.
 554                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 555                                         (c == c_water_source && (air_above || !biome))) {
 556                                 biome = biomegen->getBiomeAtIndex(index, y);
 557
 558                                 depth_top = biome->depth_top;
 559                                 base_filler = MYMAX(depth_top + biome->depth_filler
 560                                                 + noise_filler_depth->result[index], 0);
 561                                 depth_water_top = biome->depth_water_top;
 562
 563                                 // Detect stone type for dungeons during every biome calculation.
 564                                 // This is more efficient than detecting per-node and will not
 565                                 // miss any desert stone or sandstone biomes.
 566                                 if (biome->c_stone == c_desert_stone)
 567                                         stone_type = DESERT_STONE;
 568                                 else if (biome->c_stone == c_sandstone)
 569                                         stone_type = SANDSTONE;
 570                         }
 571
 572                         if (c == c_stone) {
 573                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 574
 575                                 // If the node below isn't solid, make this node stone, so that
 576                                 // any top/filler nodes above are structurally supported.
 577                                 // This is done by aborting the cycle of top/filler placement
 578                                 // immediately by forcing nplaced to stone level.
 579                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 580                                         nplaced = U16_MAX;
 581
 582                                 if (nplaced < depth_top) {
 583                                         vm->m_data[vi] = MapNode(biome->c_top);
 584                                         nplaced++;
 585                                 } else if (nplaced < base_filler) {
 586                                         vm->m_data[vi] = MapNode(biome->c_filler);
 587                                         nplaced++;
 588                                 } else {
 589                                         vm->m_data[vi] = MapNode(biome->c_stone);
 590                                 }
 591
 592                                 air_above = false;
 593                                 water_above = false;
 594                         } else if (c == c_water_source) {
 595                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 596                                                 biome->c_water_top : biome->c_water);
 597                                 nplaced = 0;  // Enable top/filler placement for next surface
 598                                 air_above = false;
 599                                 water_above = true;
 600                         } else if (c == CONTENT_AIR) {
 601                                 nplaced = 0;  // Enable top/filler placement for next surface
 602                                 air_above = true;
 603                                 water_above = false;
 604                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 605                                 nplaced = U16_MAX;  // Disable top/filler placement
 606                                 air_above = false;
 607                                 water_above = false;
 608                         }
 609
 610                         vm->m_area.add_y(em, vi, -1);
 611                 }
 612         }
 613
 614         return stone_type;
 615 }
 616
 617
 618 void MapgenV7::dustTopNodes()
 619 {
 620         if (node_max.Y < water_level)
 621                 return;
 622
 623         v3s16 em = vm->m_area.getExtent();
 624         u32 index = 0;
 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 = (Biome *)bmgr->getRaw(biomemap[index]);
 629
 630                 if (biome->c_dust == CONTENT_IGNORE)
 631                         continue;
 632
 633                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 634                 content_t c_full_max = vm->m_data[vi].getContent();
 635                 s16 y_start;
 636
 637                 if (c_full_max == CONTENT_AIR) {
 638                         y_start = full_node_max.Y - 1;
 639                 } else if (c_full_max == CONTENT_IGNORE) {
 640                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 641                         content_t c_max = vm->m_data[vi].getContent();
 642
 643                         if (c_max == CONTENT_AIR)
 644                                 y_start = node_max.Y;
 645                         else
 646                                 continue;
 647                 } else {
 648                         continue;
 649                 }
 650
 651                 vi = vm->m_area.index(x, y_start, z);
 652                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 653                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 654                                 break;
 655
 656                         vm->m_area.add_y(em, vi, -1);
 657                 }
 658
 659                 content_t c = vm->m_data[vi].getContent();
 660                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 661                         vm->m_area.add_y(em, vi, 1);
 662                         vm->m_data[vi] = MapNode(biome->c_dust);
 663                 }
 664         }
 665 }
 666
 667
 668 void MapgenV7::generateCaves(s16 max_stone_y)
 669 {
 670         if (max_stone_y < node_min.Y)
 671                 return;
 672
 673         noise_cave1->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 674         noise_cave2->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 675
 676         v3s16 em = vm->m_area.getExtent();
 677         u32 index2d = 0;
 678
 679         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 680         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 681                 bool column_is_open = false;  // Is column open to overground
 682                 bool is_tunnel = false;  // Is tunnel or tunnel floor
 683                 // Indexes at column top (node_max.Y)
 684                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 685                 u32 index3d = (z - node_min.Z) * zstride_1d + csize.Y * ystride +
 686                         (x - node_min.X);
 687                 // Biome of column
 688                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index2d]);
 689
 690                 // Don't excavate the overgenerated stone at node_max.Y + 1,
 691                 // this creates a 'roof' over the tunnel, preventing light in
 692                 // tunnels at mapchunk borders when generating mapchunks upwards.
 693                 // This 'roof' is removed when the mapchunk above is generated.
 694                 for (s16 y = node_max.Y; y >= node_min.Y - 1; y--,
 695                                 index3d -= ystride,
 696                                 vm->m_area.add_y(em, vi, -1)) {
 697
 698                         content_t c = vm->m_data[vi].getContent();
 699                         if (c == CONTENT_AIR || c == biome->c_water_top ||
 700                                         c == biome->c_water) {
 701                                 column_is_open = true;
 702                                 continue;
 703                         }
 704                         // Ground
 705                         float d1 = contour(noise_cave1->result[index3d]);
 706                         float d2 = contour(noise_cave2->result[index3d]);
 707
 708                         if (d1 * d2 > cave_width && ndef->get(c).is_ground_content) {
 709                                 // In tunnel and ground content, excavate
 710                                 vm->m_data[vi] = MapNode(CONTENT_AIR);
 711                                 is_tunnel = true;
 712                         } else {
 713                                 // Not in tunnel or not ground content
 714                                 if (is_tunnel && column_is_open &&
 715                                                 (c == biome->c_filler || c == biome->c_stone))
 716                                         // Tunnel entrance floor
 717                                         vm->m_data[vi] = MapNode(biome->c_top);
 718
 719                                 column_is_open = false;
 720                                 is_tunnel = false;
 721                         }
 722                 }
 723         }
 724
 725         if (node_min.Y >= water_level)
 726                 return;
 727
 728         PseudoRandom ps(blockseed + 21343);
 729         u32 bruises_count = ps.range(0, 2);
 730         for (u32 i = 0; i < bruises_count; i++) {
 731                 CaveV7 cave(this, &ps);
 732                 cave.makeCave(node_min, node_max, max_stone_y);
 733         }
 734 }
 735
 736
 737 ///////////////////////////////////////////////////////////////
 738
 739
 740 #if 0
 741 int MapgenV7::generateMountainTerrain(s16 ymax)
 742 {
 743         MapNode n_stone(c_stone);
 744         u32 j = 0;
 745
 746         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 747         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 748                 u32 vi = vm->m_area.index(node_min.X, y, z);
 749                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 750                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 751                         content_t c = vm->m_data[vi].getContent();
 752
 753                         if (getMountainTerrainFromMap(j, index, y)
 754                                         && (c == CONTENT_AIR || c == c_water_source)) {
 755                                 vm->m_data[vi] = n_stone;
 756                                 if (y > ymax)
 757                                         ymax = y;
 758                         }
 759
 760                         vi++;
 761                         j++;
 762                 }
 763         }
 764
 765         return ymax;
 766 }
 767 #endif
 768
 769
 770 #if 0
 771 void MapgenV7::carveRivers() {
 772         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 773         MapNode n_stone(c_stone);
 774         u32 index = 0;
 775
 776         int river_depth = 4;
 777
 778         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 779         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 780                 float terrain_mod  = noise_terrain_mod->result[index];
 781                 NoiseParams *np = noise_terrain_river->np;
 782                 np.persist = noise_terrain_persist->result[index];
 783                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 784                 float height = terrain_river * (1 - abs(terrain_mod)) *
 785                                                 noise_terrain_river->np.scale;
 786                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 787
 788                 s16 y = heightmap[index];
 789                 if (height < 1.0 && y > river_depth &&
 790                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 791
 792                         for (s16 ry = y; ry != y - river_depth; ry--) {
 793                                 u32 vi = vm->m_area.index(x, ry, z);
 794                                 vm->m_data[vi] = n_air;
 795                         }
 796
 797                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 798                         vm->m_data[vi] = n_water_source;
 799                 }
 800         }
 801 }
 802 #endif
 803
 804
 805 #if 0
 806 void MapgenV7::addTopNodes()
 807 {
 808         v3s16 em = vm->m_area.getExtent();
 809         s16 ntopnodes;
 810         u32 index = 0;
 811
 812         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 813         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 814                 Biome *biome = bmgr->biomes[biomemap[index]];
 815
 816                 //////////////////// First, add top nodes below the ridge
 817                 s16 y = ridge_heightmap[index];
 818
 819                 // This cutoff is good enough, but not perfect.
 820                 // It will cut off potentially placed top nodes at chunk boundaries
 821                 if (y < node_min.Y)
 822                         continue;
 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                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 832                 // might not be the actual height, just the lowest part in the chunk
 833                 // where a ridge had been carved
 834                 u32 i = vm->m_area.index(x, y, z);
 835                 for (; y >= node_min.Y; y--) {
 836                         content_t c = vm->m_data[i].getContent();
 837                         if (ndef->get(c).walkable)
 838                                 break;
 839                         vm->m_area.add_y(em, i, -1);
 840                 }
 841
 842                 if (y != node_min.Y - 1 && y >= water_level) {
 843                         ridge_heightmap[index] = y; //update ridgeheight
 844                         ntopnodes = biome->top_depth;
 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                 //////////////////// Now, add top nodes on top of the ridge
 860                 y = heightmap[index];
 861                 if (y > node_max.Y) {
 862                         y = node_max.Y; // Let's see if we can still go downward anyway
 863                         u32 vi = vm->m_area.index(x, y, z);
 864                         content_t c = vm->m_data[vi].getContent();
 865                         if (ndef->get(c).walkable)
 866                                 continue;
 867                 }
 868
 869                 i = vm->m_area.index(x, y, z);
 870                 for (; y >= node_min.Y; y--) {
 871                         content_t c = vm->m_data[i].getContent();
 872                         if (ndef->get(c).walkable)
 873                                 break;
 874                         vm->m_area.add_y(em, i, -1);
 875                 }
 876
 877                 if (y != node_min.Y - 1) {
 878                         ntopnodes = biome->top_depth;
 879                         // Let's see if we've already added it...
 880                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 881                                 continue;
 882
 883                         for (; y <= node_max.Y && ntopnodes; y++) {
 884                                 ntopnodes--;
 885                                 vm->m_data[i] = MapNode(biome->c_top);
 886                                 vm->m_area.add_y(em, i, 1);
 887                         }
 888                         // If dirt, grow grass on it.
 889                         if (y > water_level - 10 &&
 890                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 891                                 vm->m_area.add_y(em, i, -1);
 892                                 if (vm->m_data[i].getContent() == c_dirt)
 893                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 894                         }
 895                 }
 896         }
 897 }
 898 #endif