src/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20
  21 #include "mapgen.h"
  22 #include "voxel.h"
  23 #include "noise.h"
  24 #include "mapblock.h"
  25 #include "mapnode.h"
  26 #include "map.h"
  27 #include "content_sao.h"
  28 #include "nodedef.h"
  29 #include "voxelalgorithms.h"
  30 #include "profiler.h"
  31 #include "settings.h" // For g_settings
  32 #include "main.h" // For g_profiler
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.h"
  36 #include "treegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_v7.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_v7[] = {
  44         {"mountains", MGV7_MOUNTAINS},
  45         {"ridges",    MGV7_RIDGES},
  46         {NULL,        0}
  47 };
  48
  49 ///////////////////////////////////////////////////////////////////////////////
  50
  51
  52 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  53         : Mapgen(mapgenid, params, emerge)
  54 {
  55         this->m_emerge = emerge;
  56         this->bmgr     = emerge->biomemgr;
  57
  58         //// amount of elements to skip for the next index
  59         //// for noise/height/biome maps (not vmanip)
  60         this->ystride = csize.X;
  61         this->zstride = csize.X * csize.Y;
  62
  63         this->biomemap  = new u8[csize.X * csize.Z];
  64         this->heightmap = new s16[csize.X * csize.Z];
  65         this->ridge_heightmap = new s16[csize.X * csize.Z];
  66
  67         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  68         this->spflags = sp->spflags;
  69
  70         //// Terrain noise
  71         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  72         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  73         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  74         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  75         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  76         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  77         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  78
  79         //// 3d terrain noise
  80         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y, csize.Z);
  81         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y, csize.Z);
  82
  83         //// Biome noise
  84         noise_heat     = new Noise(&params->np_biome_heat,     seed, csize.X, csize.Z);
  85         noise_humidity = new Noise(&params->np_biome_humidity, seed, csize.X, csize.Z);
  86
  87         //// Resolve nodes to be used
  88         INodeDefManager *ndef = emerge->ndef;
  89
  90         c_stone           = ndef->getId("mapgen_stone");
  91         c_dirt            = ndef->getId("mapgen_dirt");
  92         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  93         c_sand            = ndef->getId("mapgen_sand");
  94         c_water_source    = ndef->getId("mapgen_water_source");
  95         c_lava_source     = ndef->getId("mapgen_lava_source");
  96         c_ice             = ndef->getId("default:ice");
  97         if (c_ice == CONTENT_IGNORE)
  98                 c_ice = CONTENT_AIR;
  99 }
 100
 101
 102 MapgenV7::~MapgenV7()
 103 {
 104         delete noise_terrain_base;
 105         delete noise_terrain_persist;
 106         delete noise_height_select;
 107         delete noise_terrain_alt;
 108         delete noise_filler_depth;
 109         delete noise_mount_height;
 110         delete noise_ridge_uwater;
 111         delete noise_mountain;
 112         delete noise_ridge;
 113
 114         delete noise_heat;
 115         delete noise_humidity;
 116
 117         delete[] ridge_heightmap;
 118         delete[] heightmap;
 119         delete[] biomemap;
 120 }
 121
 122
 123 MapgenV7Params::MapgenV7Params()
 124 {
 125         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 126
 127         np_terrain_base    = NoiseParams(4,    70,  v3f(300, 300, 300), 82341, 6, 0.7,  2.0);
 128         np_terrain_alt     = NoiseParams(4,    25,  v3f(600, 600, 600), 5934,  5, 0.6,  2.0);
 129         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500, 500, 500), 539,   3, 0.6,  2.0);
 130         np_height_select   = NoiseParams(-0.5, 1,   v3f(250, 250, 250), 4213,  5, 0.69, 2.0);
 131         np_filler_depth    = NoiseParams(0,    1.2, v3f(150, 150, 150), 261,   4, 0.7,  2.0);
 132         np_mount_height    = NoiseParams(100,  30,  v3f(500, 500, 500), 72449, 4, 0.6,  2.0);
 133         np_ridge_uwater    = NoiseParams(0,    1,   v3f(500, 500, 500), 85039, 4, 0.6,  2.0);
 134         np_mountain        = NoiseParams(0,    1,   v3f(250, 350, 250), 5333,  5, 0.68, 2.0);
 135         np_ridge           = NoiseParams(0,    1,   v3f(100, 100, 100), 6467,  4, 0.75, 2.0);
 136 }
 137
 138
 139 void MapgenV7Params::readParams(Settings *settings)
 140 {
 141         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 142
 143         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 144         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 145         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 146         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 147         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 148         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 149         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 150         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 151         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 152 }
 153
 154
 155 void MapgenV7Params::writeParams(Settings *settings)
 156 {
 157         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 158
 159         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 160         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 161         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 162         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 163         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 164         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 165         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 166         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 167         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 168 }
 169
 170
 171 ///////////////////////////////////////
 172
 173
 174 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 175 {
 176         // Base terrain calculation
 177         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 178
 179         // Ridge/river terrain calculation
 180         float width = 0.3;
 181         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 182         // actually computing the depth of the ridge is much more expensive;
 183         // if inside a river, simply guess
 184         if (uwatern >= -width && uwatern <= width)
 185                 return water_level - 10;
 186
 187         // Mountain terrain calculation
 188         int iters = 128; // don't even bother iterating more than 128 times..
 189         while (iters--) {
 190                 //current point would have been air
 191                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 192                         return y;
 193
 194                 y++;
 195         }
 196
 197         return y;
 198 }
 199
 200
 201 void MapgenV7::makeChunk(BlockMakeData *data)
 202 {
 203         assert(data->vmanip);
 204         assert(data->nodedef);
 205         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 206                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 207                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 208         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 209                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 210                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 211
 212         this->generating = true;
 213         this->vm   = data->vmanip;
 214         this->ndef = data->nodedef;
 215         //TimeTaker t("makeChunk");
 216
 217         v3s16 blockpos_min = data->blockpos_min;
 218         v3s16 blockpos_max = data->blockpos_max;
 219         node_min = blockpos_min * MAP_BLOCKSIZE;
 220         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 221         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 222         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 223
 224         blockseed = getBlockSeed2(full_node_min, seed);
 225
 226         // Make some noise
 227         calculateNoise();
 228
 229         // Generate base terrain, mountains, and ridges with initial heightmaps
 230         s16 stone_surface_max_y = generateTerrain();
 231
 232         updateHeightmap(node_min, node_max);
 233
 234         // Calculate biomes
 235         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 236                 noise_humidity->result, heightmap, biomemap);
 237
 238         // Actually place the biome-specific nodes and what not
 239         generateBiomes();
 240
 241         if (flags & MG_CAVES)
 242                 generateCaves(stone_surface_max_y);
 243
 244         if (flags & MG_DUNGEONS) {
 245                 DungeonGen dgen(this, NULL);
 246                 dgen.generate(blockseed, full_node_min, full_node_max);
 247         }
 248
 249         // Generate the registered decorations
 250         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 251
 252         // Generate the registered ores
 253         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 254
 255         // Sprinkle some dust on top after everything else was generated
 256         dustTopNodes();
 257
 258         //printf("makeChunk: %dms\n", t.stop());
 259
 260         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 261
 262         if (flags & MG_LIGHT)
 263                 calcLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 264                                          node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE);
 265         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 266         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 267
 268         this->generating = false;
 269 }
 270
 271
 272 void MapgenV7::calculateNoise()
 273 {
 274         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 275         int x = node_min.X;
 276         int y = node_min.Y;
 277         int z = node_min.Z;
 278
 279         noise_height_select->perlinMap2D(x, z);
 280         noise_terrain_persist->perlinMap2D(x, z);
 281         float *persistmap = noise_terrain_persist->result;
 282         for (int i = 0; i != csize.X * csize.Z; i++)
 283                 persistmap[i] = rangelim(persistmap[i], 0.4, 0.9);
 284
 285         noise_terrain_base->perlinMap2D(x, z, persistmap);
 286         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 287         noise_filler_depth->perlinMap2D(x, z);
 288
 289         if (spflags & MGV7_MOUNTAINS) {
 290                 noise_mountain->perlinMap3D(x, y, z);
 291                 noise_mount_height->perlinMap2D(x, z);
 292         }
 293
 294         if (spflags & MGV7_RIDGES) {
 295                 noise_ridge->perlinMap3D(x, y, z);
 296                 noise_ridge_uwater->perlinMap2D(x, z);
 297         }
 298
 299         noise_heat->perlinMap2D(x, z);
 300         noise_humidity->perlinMap2D(x, z);
 301
 302         //printf("calculateNoise: %dus\n", t.stop());
 303 }
 304
 305
 306 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 307 {
 308         float heat      = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed);
 309         float humidity  = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed);
 310         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 311
 312         return bmgr->getBiome(heat, humidity, groundlevel);
 313 }
 314
 315 //needs to be updated
 316 float MapgenV7::baseTerrainLevelAtPoint(int x, int z)
 317 {
 318         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 319         hselect = rangelim(hselect, 0.0, 1.0);
 320
 321         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 322         persist = rangelim(persist, 0.4, 0.9);
 323
 324         noise_terrain_base->np.persist = persist;
 325         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 326
 327         noise_terrain_alt->np.persist = persist;
 328         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 329
 330         if (height_alt > height_base)
 331                 return height_alt;
 332
 333         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 334 }
 335
 336
 337 float MapgenV7::baseTerrainLevelFromMap(int index)
 338 {
 339         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 340         float height_base = noise_terrain_base->result[index];
 341         float height_alt  = noise_terrain_alt->result[index];
 342
 343         if (height_alt > height_base)
 344                 return height_alt;
 345
 346         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 347 }
 348
 349
 350 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z)
 351 {
 352         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 353         float height_modifier = -((float)y / rangelim(mnt_h_n, 80.0, 150.0));
 354         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 355
 356         return mnt_n + height_modifier >= 0.6;
 357 }
 358
 359
 360 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y)
 361 {
 362         float mounthn = noise_mount_height->result[idx_xz];
 363         float height_modifier = -((float)y / rangelim(mounthn, 80.0, 150.0));
 364         return (noise_mountain->result[idx_xyz] + height_modifier >= 0.6);
 365 }
 366
 367
 368 #if 0
 369 void MapgenV7::carveRivers() {
 370         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 371         MapNode n_stone(c_stone);
 372         u32 index = 0;
 373
 374         int river_depth = 4;
 375
 376         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 377         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 378                 float terrain_mod  = noise_terrain_mod->result[index];
 379                 NoiseParams *np = noise_terrain_river->np;
 380                 np.persist = noise_terrain_persist->result[index];
 381                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 382                 float height = terrain_river * (1 - abs(terrain_mod)) *
 383                                                 noise_terrain_river->np.scale;
 384                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 385
 386                 s16 y = heightmap[index];
 387                 if (height < 1.0 && y > river_depth &&
 388                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 389
 390                         for (s16 ry = y; ry != y - river_depth; ry--) {
 391                                 u32 vi = vm->m_area.index(x, ry, z);
 392                                 vm->m_data[vi] = n_air;
 393                         }
 394
 395                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 396                         vm->m_data[vi] = n_water_source;
 397                 }
 398         }
 399 }
 400 #endif
 401
 402
 403 int MapgenV7::generateTerrain()
 404 {
 405         int ymax = generateBaseTerrain();
 406
 407         if (spflags & MGV7_MOUNTAINS)
 408                 generateMountainTerrain();
 409
 410         if (spflags & MGV7_RIDGES)
 411                 generateRidgeTerrain();
 412
 413         return ymax;
 414 }
 415
 416
 417 int MapgenV7::generateBaseTerrain()
 418 {
 419         MapNode n_air(CONTENT_AIR);
 420         MapNode n_stone(c_stone);
 421         MapNode n_water(c_water_source);
 422
 423         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 424         v3s16 em = vm->m_area.getExtent();
 425         u32 index = 0;
 426
 427         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 428         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 429                 float surface_height = baseTerrainLevelFromMap(index);
 430                 s16 surface_y = (s16)surface_height;
 431
 432                 heightmap[index]       = surface_y;
 433                 ridge_heightmap[index] = surface_y;
 434
 435                 if (surface_y > stone_surface_max_y)
 436                         stone_surface_max_y = surface_y;
 437
 438                 u32 i = vm->m_area.index(x, node_min.Y, z);
 439                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 440                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 441                                 if (y <= surface_y)
 442                                         vm->m_data[i] = n_stone;
 443                                 else if (y <= water_level)
 444                                         vm->m_data[i] = n_water;
 445                                 else
 446                                         vm->m_data[i] = n_air;
 447                         }
 448                         vm->m_area.add_y(em, i, 1);
 449                 }
 450         }
 451
 452         return stone_surface_max_y;
 453 }
 454
 455
 456 void MapgenV7::generateMountainTerrain()
 457 {
 458         if (node_max.Y <= water_level)
 459                 return;
 460
 461         MapNode n_stone(c_stone);
 462         u32 j = 0;
 463
 464         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 465         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 466                 u32 vi = vm->m_area.index(node_min.X, y, z);
 467                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 468                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 469
 470                         if (getMountainTerrainFromMap(j, index, y))
 471                                 vm->m_data[vi] = n_stone;
 472
 473                         vi++;
 474                         j++;
 475                 }
 476         }
 477 }
 478
 479
 480 void MapgenV7::generateRidgeTerrain()
 481 {
 482         MapNode n_water(c_water_source);
 483         MapNode n_air(CONTENT_AIR);
 484         u32 index = 0;
 485
 486         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 487         for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 488                 u32 vi = vm->m_area.index(node_min.X, y, z);
 489                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 490                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 491
 492                         if (heightmap[j] < water_level - 4)
 493                                 continue;
 494
 495                         float widthn = (noise_terrain_persist->result[j] - 0.6) / 0.1;
 496                         //widthn = rangelim(widthn, -0.05, 0.5);
 497
 498                         float width = 0.3; // TODO: figure out acceptable perlin noise values
 499                         float uwatern = noise_ridge_uwater->result[j] * 2;
 500                         if (uwatern < -width || uwatern > width)
 501                                 continue;
 502
 503                         float height_mod = (float)(y + 17) / 2.5;
 504                         float width_mod  = (width - fabs(uwatern));
 505                         float nridge = noise_ridge->result[index] * (float)y / 7.0;
 506
 507                         if (y < water_level)
 508                                 nridge = -fabs(nridge) * 3.0 * widthn * 0.3;
 509
 510                         if (nridge + width_mod * height_mod < 0.6)
 511                                 continue;
 512
 513                         if (y < ridge_heightmap[j])
 514                                 ridge_heightmap[j] = y - 1;
 515
 516                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 517                 }
 518         }
 519 }
 520
 521
 522 void MapgenV7::generateBiomes()
 523 {
 524         if (node_max.Y < water_level)
 525                 return;
 526
 527         MapNode n_air(CONTENT_AIR);
 528         MapNode n_stone(c_stone);
 529         MapNode n_water(c_water_source);
 530
 531         v3s16 em = vm->m_area.getExtent();
 532         u32 index = 0;
 533
 534         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 535         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 536                 Biome *biome        = (Biome *)bmgr->get(biomemap[index]);
 537                 s16 dfiller         = biome->depth_filler + noise_filler_depth->result[index];
 538                 s16 y0_top          = biome->depth_top;
 539                 s16 y0_filler       = biome->depth_top + dfiller;
 540                 s16 shore_max       = water_level + biome->height_shore;
 541                 s16 depth_water_top = biome->depth_water_top;
 542
 543                 s16 nplaced = 0;
 544                 u32 i = vm->m_area.index(x, node_max.Y, z);
 545
 546                 content_t c_above = vm->m_data[i + em.X].getContent();
 547                 bool have_air = c_above == CONTENT_AIR;
 548
 549                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 550                         content_t c = vm->m_data[i].getContent();
 551
 552                         // It could be the case that the elevation is equal to the chunk
 553                         // boundary, but the chunk above has not been generated yet
 554                         if (y == node_max.Y && c_above == CONTENT_IGNORE &&
 555                                 y == heightmap[index] && c == c_stone) {
 556                                 int j = (z - node_min.Z) * zstride +
 557                                                 (y - node_min.Y) * ystride +
 558                                                 (x - node_min.X);
 559                                 have_air = !getMountainTerrainFromMap(j, index, y);
 560                         }
 561
 562                         if (c == c_stone && have_air) {
 563                                 content_t c_below = vm->m_data[i - em.X].getContent();
 564
 565                                 if (c_below != CONTENT_AIR) {
 566                                         if (nplaced < y0_top) {
 567                                                 if(y < water_level)
 568                                                         vm->m_data[i] = MapNode(biome->c_underwater);
 569                                                 else if(y <= shore_max)
 570                                                         vm->m_data[i] = MapNode(biome->c_shore_top);
 571                                                 else
 572                                                         vm->m_data[i] = MapNode(biome->c_top);
 573                                                 nplaced++;
 574                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 575                                                 if(y < water_level)
 576                                                         vm->m_data[i] = MapNode(biome->c_underwater);
 577                                                 else if(y <= shore_max)
 578                                                         vm->m_data[i] = MapNode(biome->c_shore_filler);
 579                                                 else
 580                                                         vm->m_data[i] = MapNode(biome->c_filler);
 581                                                 nplaced++;
 582                                         } else if (c == c_stone) {
 583                                                 have_air = false;
 584                                                 nplaced  = 0;
 585                                                 vm->m_data[i] = MapNode(biome->c_stone);
 586                                         } else {
 587                                                 have_air = false;
 588                                                 nplaced  = 0;
 589                                         }
 590                                 } else if (c == c_stone) {
 591                                         have_air = false;
 592                                         nplaced = 0;
 593                                         vm->m_data[i] = MapNode(biome->c_stone);
 594                                 }
 595                         } else if (c == c_stone) {
 596                                 have_air = false;
 597                                 nplaced = 0;
 598                                 vm->m_data[i] = MapNode(biome->c_stone);
 599                         } else if (c == c_water_source) {
 600                                 have_air = true;
 601                                 nplaced = 0;
 602                                 if(y > water_level - depth_water_top)
 603                                         vm->m_data[i] = MapNode(biome->c_water_top);
 604                                 else
 605                                         vm->m_data[i] = MapNode(biome->c_water);
 606                         } else if (c == CONTENT_AIR) {
 607                                 have_air = true;
 608                                 nplaced = 0;
 609                         }
 610
 611                         vm->m_area.add_y(em, i, -1);
 612                 }
 613         }
 614 }
 615
 616
 617 void MapgenV7::dustTopNodes()
 618 {
 619         v3s16 em = vm->m_area.getExtent();
 620         u32 index = 0;
 621
 622         if (water_level > node_max.Y)
 623                 return;
 624
 625         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 626         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 627                 Biome *biome = (Biome *)bmgr->get(biomemap[index]);
 628
 629                 if (biome->c_dust == CONTENT_IGNORE)
 630                         continue;
 631
 632                 s16 y = node_max.Y;
 633                 u32 vi = vm->m_area.index(x, y, z);
 634                 for (; y >= node_min.Y; y--) {
 635                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 636                                 break;
 637
 638                         vm->m_area.add_y(em, vi, -1);
 639                 }
 640
 641                 content_t c = vm->m_data[vi].getContent();
 642                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE) {
 643                         if (y == node_max.Y)
 644                                 continue;
 645
 646                         vm->m_area.add_y(em, vi, 1);
 647                         vm->m_data[vi] = MapNode(biome->c_dust);
 648                 }
 649         }
 650 }
 651
 652
 653 #if 0
 654 void MapgenV7::addTopNodes()
 655 {
 656         v3s16 em = vm->m_area.getExtent();
 657         s16 ntopnodes;
 658         u32 index = 0;
 659
 660         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 661         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 662                 Biome *biome = bmgr->biomes[biomemap[index]];
 663
 664                 //////////////////// First, add top nodes below the ridge
 665                 s16 y = ridge_heightmap[index];
 666
 667                 // This cutoff is good enough, but not perfect.
 668                 // It will cut off potentially placed top nodes at chunk boundaries
 669                 if (y < node_min.Y)
 670                         continue;
 671                 if (y > node_max.Y) {
 672                         y = node_max.Y; // Let's see if we can still go downward anyway
 673                         u32 vi = vm->m_area.index(x, y, z);
 674                         content_t c = vm->m_data[vi].getContent();
 675                         if (ndef->get(c).walkable)
 676                                 continue;
 677                 }
 678
 679                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 680                 // might not be the actual height, just the lowest part in the chunk
 681                 // where a ridge had been carved
 682                 u32 i = vm->m_area.index(x, y, z);
 683                 for (; y >= node_min.Y; y--) {
 684                         content_t c = vm->m_data[i].getContent();
 685                         if (ndef->get(c).walkable)
 686                                 break;
 687                         vm->m_area.add_y(em, i, -1);
 688                 }
 689
 690                 if (y != node_min.Y - 1 && y >= water_level) {
 691                         ridge_heightmap[index] = y; //update ridgeheight
 692                         ntopnodes = biome->top_depth;
 693                         for (; y <= node_max.Y && ntopnodes; y++) {
 694                                 ntopnodes--;
 695                                 vm->m_data[i] = MapNode(biome->c_top);
 696                                 vm->m_area.add_y(em, i, 1);
 697                         }
 698                         // If dirt, grow grass on it.
 699                         if (y > water_level - 10 &&
 700                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 701                                 vm->m_area.add_y(em, i, -1);
 702                                 if (vm->m_data[i].getContent() == c_dirt)
 703                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 704                         }
 705                 }
 706
 707                 //////////////////// Now, add top nodes on top of the ridge
 708                 y = heightmap[index];
 709                 if (y > node_max.Y) {
 710                         y = node_max.Y; // Let's see if we can still go downward anyway
 711                         u32 vi = vm->m_area.index(x, y, z);
 712                         content_t c = vm->m_data[vi].getContent();
 713                         if (ndef->get(c).walkable)
 714                                 continue;
 715                 }
 716
 717                 i = vm->m_area.index(x, y, z);
 718                 for (; y >= node_min.Y; y--) {
 719                         content_t c = vm->m_data[i].getContent();
 720                         if (ndef->get(c).walkable)
 721                                 break;
 722                         vm->m_area.add_y(em, i, -1);
 723                 }
 724
 725                 if (y != node_min.Y - 1) {
 726                         ntopnodes = biome->top_depth;
 727                         // Let's see if we've already added it...
 728                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 729                                 continue;
 730
 731                         for (; y <= node_max.Y && ntopnodes; y++) {
 732                                 ntopnodes--;
 733                                 vm->m_data[i] = MapNode(biome->c_top);
 734                                 vm->m_area.add_y(em, i, 1);
 735                         }
 736                         // If dirt, grow grass on it.
 737                         if (y > water_level - 10 &&
 738                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 739                                 vm->m_area.add_y(em, i, -1);
 740                                 if (vm->m_data[i].getContent() == c_dirt)
 741                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 742                         }
 743                 }
 744         }
 745 }
 746 #endif
 747
 748
 749 NoiseParams nparams_v7_def_cave(6, 6.0, v3f(250.0, 250.0, 250.0), 34329, 3, 0.50, 2.0);
 750
 751 void MapgenV7::generateCaves(int max_stone_y)
 752 {
 753         PseudoRandom ps(blockseed + 21343);
 754
 755         int volume_nodes = (node_max.X - node_min.X + 1) *
 756                                            (node_max.Y - node_min.Y + 1) *
 757                                            (node_max.Z - node_min.Z + 1);
 758         float cave_amount = NoisePerlin2D(&nparams_v7_def_cave,
 759                                                                 node_min.X, node_min.Y, seed);
 760
 761         u32 caves_count = MYMAX(0.0, cave_amount) * volume_nodes / 250000;
 762         for (u32 i = 0; i < caves_count; i++) {
 763                 CaveV7 cave(this, &ps, false);
 764                 cave.makeCave(node_min, node_max, max_stone_y);
 765         }
 766
 767         u32 bruises_count = (ps.range(1, 8) == 1) ? ps.range(0, ps.range(0, 2)) : 1;
 768         for (u32 i = 0; i < bruises_count; i++) {
 769                 CaveV7 cave(this, &ps, true);
 770                 cave.makeCave(node_min, node_max, max_stone_y);
 771         }
 772 }