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, MapgenV7Params *params, EmergeManager *emerge)
  54         : MapgenBasic(mapgenid, params, emerge)
  55 {
  56         this->spflags    = params->spflags;
  57         this->cave_width = params->cave_width;
  58
  59         //// Terrain noise
  60         noise_terrain_base    = new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  61         noise_terrain_alt     = new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  62         noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  63         noise_height_select   = new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  64         noise_filler_depth    = new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  65         noise_mount_height    = new Noise(&params->np_mount_height,    seed, csize.X, csize.Z);
  66         noise_ridge_uwater    = new Noise(&params->np_ridge_uwater,    seed, csize.X, csize.Z);
  67
  68         //// 3d terrain noise
  69         // 1-up 1-down overgeneration
  70         noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  71         noise_ridge    = new Noise(&params->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  72
  73         MapgenBasic::np_cave1 = params->np_cave1;
  74         MapgenBasic::np_cave2 = params->np_cave2;
  75 }
  76
  77
  78 MapgenV7::~MapgenV7()
  79 {
  80         delete noise_terrain_base;
  81         delete noise_terrain_persist;
  82         delete noise_height_select;
  83         delete noise_terrain_alt;
  84         delete noise_filler_depth;
  85         delete noise_mount_height;
  86         delete noise_ridge_uwater;
  87         delete noise_mountain;
  88         delete noise_ridge;
  89 }
  90
  91
  92 MapgenV7Params::MapgenV7Params()
  93 {
  94         spflags    = MGV7_MOUNTAINS | MGV7_RIDGES;
  95         cave_width = 0.2;
  96
  97         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
  98         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
  99         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 100         np_height_select   = NoiseParams(-8,   16,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 101         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 102         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 103         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 104         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 105         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 106         np_cave1           = NoiseParams(0,    12,  v3f(61,   61,   61),   52534, 3, 0.5,  2.0);
 107         np_cave2           = NoiseParams(0,    12,  v3f(67,   67,   67),   10325, 3, 0.5,  2.0);
 108 }
 109
 110
 111 void MapgenV7Params::readParams(const Settings *settings)
 112 {
 113         settings->getFlagStrNoEx("mgv7_spflags",  spflags, flagdesc_mapgen_v7);
 114         settings->getFloatNoEx("mgv7_cave_width", cave_width);
 115
 116         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 117         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 118         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 119         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 120         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 121         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 122         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 123         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 124         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 125         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 126         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 127 }
 128
 129
 130 void MapgenV7Params::writeParams(Settings *settings) const
 131 {
 132         settings->setFlagStr("mgv7_spflags",  spflags, flagdesc_mapgen_v7, U32_MAX);
 133         settings->setFloat("mgv7_cave_width", cave_width);
 134
 135         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 136         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 137         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 138         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 139         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 140         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 141         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 142         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 143         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 144         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 145         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 146 }
 147
 148
 149 ///////////////////////////////////////////////////////////////////////////////
 150
 151
 152 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 153 {
 154         // Base terrain calculation
 155         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 156
 157         // Ridge/river terrain calculation
 158         float width = 0.2;
 159         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 160         // if inside a river this is an unsuitable spawn point
 161         if (fabs(uwatern) <= width)
 162                 return MAX_MAP_GENERATION_LIMIT;
 163
 164         // Mountain terrain calculation
 165         int iters = 128;
 166         while (iters--) {
 167                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // Air, y is ground level
 168                         if (y <= water_level || y > water_level + 16)
 169                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 170                         else
 171                                 return y;
 172                 }
 173                 y++;
 174         }
 175
 176         // Unsuitable spawn point, no ground surface found
 177         return MAX_MAP_GENERATION_LIMIT;
 178 }
 179
 180
 181 void MapgenV7::makeChunk(BlockMakeData *data)
 182 {
 183         // Pre-conditions
 184         assert(data->vmanip);
 185         assert(data->nodedef);
 186         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 187                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 188                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 189         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 190                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 191                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 192
 193         this->generating = true;
 194         this->vm   = data->vmanip;
 195         this->ndef = data->nodedef;
 196         //TimeTaker t("makeChunk");
 197
 198         v3s16 blockpos_min = data->blockpos_min;
 199         v3s16 blockpos_max = data->blockpos_max;
 200         node_min = blockpos_min * MAP_BLOCKSIZE;
 201         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 202         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 203         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 204
 205         blockseed = getBlockSeed2(full_node_min, seed);
 206
 207         // Generate base and mountain terrain
 208         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 209         s16 stone_surface_max_y = generateTerrain();
 210
 211         // Generate rivers
 212         if (spflags & MGV7_RIDGES)
 213                 generateRidgeTerrain();
 214
 215         // Create heightmap
 216         updateHeightmap(node_min, node_max);
 217
 218         // Init biome generator, place biome-specific nodes, and build biomemap
 219         biomegen->calcBiomeNoise(node_min);
 220         MgStoneType stone_type = generateBiomes();
 221
 222         if (flags & MG_CAVES)
 223                 generateCaves(stone_surface_max_y, water_level);
 224
 225         if (flags & MG_DUNGEONS)
 226                 generateDungeons(stone_surface_max_y, stone_type);
 227
 228         // Generate the registered decorations
 229         if (flags & MG_DECORATIONS)
 230                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 231
 232         // Generate the registered ores
 233         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 234
 235         // Sprinkle some dust on top after everything else was generated
 236         dustTopNodes();
 237
 238         //printf("makeChunk: %dms\n", t.stop());
 239
 240         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 241
 242         if (flags & MG_LIGHT)
 243                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 244                         full_node_min, full_node_max);
 245
 246         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 247         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 248
 249         this->generating = false;
 250 }
 251
 252
 253 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 254 {
 255         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 256         hselect = rangelim(hselect, 0.0, 1.0);
 257
 258         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 259
 260         noise_terrain_base->np.persist = persist;
 261         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 262
 263         noise_terrain_alt->np.persist = persist;
 264         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 265
 266         if (height_alt > height_base)
 267                 return height_alt;
 268
 269         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 270 }
 271
 272
 273 float MapgenV7::baseTerrainLevelFromMap(int index)
 274 {
 275         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 276         float height_base = noise_terrain_base->result[index];
 277         float height_alt  = noise_terrain_alt->result[index];
 278
 279         if (height_alt > height_base)
 280                 return height_alt;
 281
 282         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 283 }
 284
 285
 286 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 287 {
 288         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 289         float density_gradient = -((float)y / mnt_h_n);
 290         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 291
 292         return mnt_n + density_gradient >= 0.0;
 293 }
 294
 295
 296 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 297 {
 298         float mounthn = noise_mount_height->result[idx_xz];
 299         float density_gradient = -((float)y / mounthn);
 300         float mountn = noise_mountain->result[idx_xyz];
 301
 302         return mountn + density_gradient >= 0.0;
 303 }
 304
 305
 306 int MapgenV7::generateTerrain()
 307 {
 308         MapNode n_air(CONTENT_AIR);
 309         MapNode n_stone(c_stone);
 310         MapNode n_water(c_water_source);
 311
 312         //// Calculate noise for terrain generation
 313         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 314         float *persistmap = noise_terrain_persist->result;
 315
 316         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 317         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 318         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 319
 320         if (spflags & MGV7_MOUNTAINS) {
 321                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 322                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 323         }
 324
 325         //// Place nodes
 326         v3s16 em = vm->m_area.getExtent();
 327         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 328         u32 index2d = 0;
 329
 330         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 331         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 332                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 333
 334                 if (surface_y > stone_surface_max_y)
 335                         stone_surface_max_y = surface_y;
 336
 337                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 338                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 339
 340                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 341                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 342                                 if (y <= surface_y) {
 343                                         vm->m_data[vi] = n_stone;  // Base terrain
 344                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 345                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 346                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 347                                         if (y > stone_surface_max_y)
 348                                                 stone_surface_max_y = y;
 349                                 } else if (y <= water_level) {
 350                                         vm->m_data[vi] = n_water;
 351                                 } else {
 352                                         vm->m_data[vi] = n_air;
 353                                 }
 354                         }
 355                         vm->m_area.add_y(em, vi, 1);
 356                         index3d += ystride;
 357                 }
 358         }
 359
 360         return stone_surface_max_y;
 361 }
 362
 363
 364 void MapgenV7::generateRidgeTerrain()
 365 {
 366         if (node_max.Y < water_level - 16)
 367                 return;
 368
 369         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 370         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 371
 372         MapNode n_water(c_water_source);
 373         MapNode n_air(CONTENT_AIR);
 374         u32 index = 0;
 375         float width = 0.2;
 376
 377         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 378         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 379                 u32 vi = vm->m_area.index(node_min.X, y, z);
 380                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 381                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 382
 383                         float uwatern = noise_ridge_uwater->result[j] * 2;
 384                         if (fabs(uwatern) > width)
 385                                 continue;
 386
 387                         float altitude = y - water_level;
 388                         float height_mod = (altitude + 17) / 2.5;
 389                         float width_mod  = width - fabs(uwatern);
 390                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 391
 392                         if (nridge + width_mod * height_mod < 0.6)
 393                                 continue;
 394
 395                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 396                 }
 397         }
 398 }
 399
 400
 401 ////////////////////////////////////////////////////////////////////////////////
 402 //// Code Boneyard
 403 ////
 404 //// Much of the stuff here has potential to become useful again at some point
 405 //// in the future, but we don't want it to get lost or forgotten in version
 406 //// control.
 407 ////
 408
 409 #if 0
 410 int MapgenV7::generateMountainTerrain(s16 ymax)
 411 {
 412         MapNode n_stone(c_stone);
 413         u32 j = 0;
 414
 415         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 416         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 417                 u32 vi = vm->m_area.index(node_min.X, y, z);
 418                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 419                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 420                         content_t c = vm->m_data[vi].getContent();
 421
 422                         if (getMountainTerrainFromMap(j, index, y)
 423                                         && (c == CONTENT_AIR || c == c_water_source)) {
 424                                 vm->m_data[vi] = n_stone;
 425                                 if (y > ymax)
 426                                         ymax = y;
 427                         }
 428
 429                         vi++;
 430                         j++;
 431                 }
 432         }
 433
 434         return ymax;
 435 }
 436 #endif
 437
 438
 439 #if 0
 440 void MapgenV7::carveRivers() {
 441         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 442         MapNode n_stone(c_stone);
 443         u32 index = 0;
 444
 445         int river_depth = 4;
 446
 447         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 448         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 449                 float terrain_mod  = noise_terrain_mod->result[index];
 450                 NoiseParams *np = noise_terrain_river->np;
 451                 np.persist = noise_terrain_persist->result[index];
 452                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 453                 float height = terrain_river * (1 - abs(terrain_mod)) *
 454                                                 noise_terrain_river->np.scale;
 455                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 456
 457                 s16 y = heightmap[index];
 458                 if (height < 1.0 && y > river_depth &&
 459                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 460
 461                         for (s16 ry = y; ry != y - river_depth; ry--) {
 462                                 u32 vi = vm->m_area.index(x, ry, z);
 463                                 vm->m_data[vi] = n_air;
 464                         }
 465
 466                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 467                         vm->m_data[vi] = n_water_source;
 468                 }
 469         }
 470 }
 471 #endif
 472
 473
 474 #if 0
 475 void MapgenV7::addTopNodes()
 476 {
 477         v3s16 em = vm->m_area.getExtent();
 478         s16 ntopnodes;
 479         u32 index = 0;
 480
 481         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 482         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 483                 Biome *biome = bmgr->biomes[biomemap[index]];
 484
 485                 //////////////////// First, add top nodes below the ridge
 486                 s16 y = ridge_heightmap[index];
 487
 488                 // This cutoff is good enough, but not perfect.
 489                 // It will cut off potentially placed top nodes at chunk boundaries
 490                 if (y < node_min.Y)
 491                         continue;
 492                 if (y > node_max.Y) {
 493                         y = node_max.Y; // Let's see if we can still go downward anyway
 494                         u32 vi = vm->m_area.index(x, y, z);
 495                         content_t c = vm->m_data[vi].getContent();
 496                         if (ndef->get(c).walkable)
 497                                 continue;
 498                 }
 499
 500                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 501                 // might not be the actual height, just the lowest part in the chunk
 502                 // where a ridge had been carved
 503                 u32 i = vm->m_area.index(x, y, z);
 504                 for (; y >= node_min.Y; y--) {
 505                         content_t c = vm->m_data[i].getContent();
 506                         if (ndef->get(c).walkable)
 507                                 break;
 508                         vm->m_area.add_y(em, i, -1);
 509                 }
 510
 511                 if (y != node_min.Y - 1 && y >= water_level) {
 512                         ridge_heightmap[index] = y; //update ridgeheight
 513                         ntopnodes = biome->top_depth;
 514                         for (; y <= node_max.Y && ntopnodes; y++) {
 515                                 ntopnodes--;
 516                                 vm->m_data[i] = MapNode(biome->c_top);
 517                                 vm->m_area.add_y(em, i, 1);
 518                         }
 519                         // If dirt, grow grass on it.
 520                         if (y > water_level - 10 &&
 521                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 522                                 vm->m_area.add_y(em, i, -1);
 523                                 if (vm->m_data[i].getContent() == c_dirt)
 524                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 525                         }
 526                 }
 527
 528                 //////////////////// Now, add top nodes on top of the ridge
 529                 y = heightmap[index];
 530                 if (y > node_max.Y) {
 531                         y = node_max.Y; // Let's see if we can still go downward anyway
 532                         u32 vi = vm->m_area.index(x, y, z);
 533                         content_t c = vm->m_data[vi].getContent();
 534                         if (ndef->get(c).walkable)
 535                                 continue;
 536                 }
 537
 538                 i = vm->m_area.index(x, y, z);
 539                 for (; y >= node_min.Y; y--) {
 540                         content_t c = vm->m_data[i].getContent();
 541                         if (ndef->get(c).walkable)
 542                                 break;
 543                         vm->m_area.add_y(em, i, -1);
 544                 }
 545
 546                 if (y != node_min.Y - 1) {
 547                         ntopnodes = biome->top_depth;
 548                         // Let's see if we've already added it...
 549                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 550                                 continue;
 551
 552                         for (; y <= node_max.Y && ntopnodes; y++) {
 553                                 ntopnodes--;
 554                                 vm->m_data[i] = MapNode(biome->c_top);
 555                                 vm->m_area.add_y(em, i, 1);
 556                         }
 557                         // If dirt, grow grass on it.
 558                         if (y > water_level - 10 &&
 559                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 560                                 vm->m_area.add_y(em, i, -1);
 561                                 if (vm->m_data[i].getContent() == c_dirt)
 562                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 563                         }
 564                 }
 565         }
 566 }
 567 #endif