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         : MapgenBasic(mapgenid, params, emerge)
  55 {
  56         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  57
  58         this->spflags    = sp->spflags;
  59         this->cave_width = sp->cave_width;
  60
  61         //// Terrain noise
  62         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  63         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  64         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  65         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  66         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  67         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  68         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  69
  70         //// 3d terrain noise
  71         // 1-up 1-down overgeneration
  72         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  73         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  74
  75         MapgenBasic::np_cave1 = sp->np_cave1;
  76         MapgenBasic::np_cave2 = sp->np_cave2;
  77
  78         // Content used for dungeon generation
  79         c_cobble               = ndef->getId("mapgen_cobble");
  80         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
  81         c_mossycobble          = ndef->getId("mapgen_mossycobble");
  82         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
  83         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
  84
  85         // Fall back to more basic content if not defined
  86         if (c_mossycobble == CONTENT_IGNORE)
  87                 c_mossycobble = c_cobble;
  88         if (c_stair_cobble == CONTENT_IGNORE)
  89                 c_stair_cobble = c_cobble;
  90         if (c_sandstonebrick == CONTENT_IGNORE)
  91                 c_sandstonebrick = c_sandstone;
  92         if (c_stair_sandstonebrick == CONTENT_IGNORE)
  93                 c_stair_sandstonebrick = c_sandstone;
  94 }
  95
  96
  97 MapgenV7::~MapgenV7()
  98 {
  99         delete noise_terrain_base;
 100         delete noise_terrain_persist;
 101         delete noise_height_select;
 102         delete noise_terrain_alt;
 103         delete noise_filler_depth;
 104         delete noise_mount_height;
 105         delete noise_ridge_uwater;
 106         delete noise_mountain;
 107         delete noise_ridge;
 108 }
 109
 110
 111 MapgenV7Params::MapgenV7Params()
 112 {
 113         spflags    = MGV7_MOUNTAINS | MGV7_RIDGES;
 114         cave_width = 0.3;
 115
 116         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 117         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 118         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 119         np_height_select   = NoiseParams(-8,   16,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 120         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 121         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 122         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 123         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 124         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 125         np_cave1           = NoiseParams(0,    12,  v3f(96,   96,   96),   52534, 4, 0.5,  2.0);
 126         np_cave2           = NoiseParams(0,    12,  v3f(96,   96,   96),   10325, 4, 0.5,  2.0);
 127 }
 128
 129
 130 void MapgenV7Params::readParams(const Settings *settings)
 131 {
 132         settings->getFlagStrNoEx("mgv7_spflags",  spflags, flagdesc_mapgen_v7);
 133         settings->getFloatNoEx("mgv7_cave_width", cave_width);
 134
 135         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 136         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 137         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 138         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 139         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 140         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 141         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 142         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 143         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 144         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 145         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 146 }
 147
 148
 149 void MapgenV7Params::writeParams(Settings *settings) const
 150 {
 151         settings->setFlagStr("mgv7_spflags",  spflags, flagdesc_mapgen_v7, U32_MAX);
 152         settings->setFloat("mgv7_cave_width", cave_width);
 153
 154         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 155         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 156         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 157         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 158         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 159         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 160         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 161         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 162         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 163         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 164         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 165 }
 166
 167
 168 ///////////////////////////////////////////////////////////////////////////////
 169
 170
 171 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 172 {
 173         // Base terrain calculation
 174         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 175
 176         // Ridge/river terrain calculation
 177         float width = 0.2;
 178         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 179         // if inside a river this is an unsuitable spawn point
 180         if (fabs(uwatern) <= width)
 181                 return MAX_MAP_GENERATION_LIMIT;
 182
 183         // Mountain terrain calculation
 184         int iters = 128;
 185         while (iters--) {
 186                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // Air, y is ground level
 187                         if (y <= water_level || y > water_level + 16)
 188                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 189                         else
 190                                 return y;
 191                 }
 192                 y++;
 193         }
 194
 195         // Unsuitable spawn point, no ground surface found
 196         return MAX_MAP_GENERATION_LIMIT;
 197 }
 198
 199
 200 void MapgenV7::makeChunk(BlockMakeData *data)
 201 {
 202         // Pre-conditions
 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         // Generate terrain and ridges with initial heightmaps
 227         s16 stone_surface_max_y = generateTerrain();
 228
 229         if (spflags & MGV7_RIDGES)
 230                 generateRidgeTerrain();
 231
 232         // Update heightmap to include mountain terrain
 233         updateHeightmap(node_min, node_max);
 234
 235         // Init biome generator, place biome-specific nodes, and build biomemap
 236         biomegen->calcBiomeNoise(node_min);
 237         biomegen->getBiomes(heightmap);
 238         MgStoneType stone_type = generateBiomes();
 239
 240         if (flags & MG_CAVES)
 241                 generateCaves(stone_surface_max_y, water_level);
 242
 243         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 244                 DungeonParams dp;
 245
 246                 dp.np_rarity  = nparams_dungeon_rarity;
 247                 dp.np_density = nparams_dungeon_density;
 248                 dp.np_wetness = nparams_dungeon_wetness;
 249                 dp.c_water    = c_water_source;
 250                 if (stone_type == MGSTONE_STONE) {
 251                         dp.c_cobble = c_cobble;
 252                         dp.c_moss   = c_mossycobble;
 253                         dp.c_stair  = c_stair_cobble;
 254
 255                         dp.diagonal_dirs = false;
 256                         dp.mossratio     = 3.0;
 257                         dp.holesize      = v3s16(1, 2, 1);
 258                         dp.roomsize      = v3s16(0, 0, 0);
 259                         dp.notifytype    = GENNOTIFY_DUNGEON;
 260                 } else if (stone_type == MGSTONE_DESERT_STONE) {
 261                         dp.c_cobble = c_desert_stone;
 262                         dp.c_moss   = c_desert_stone;
 263                         dp.c_stair  = c_desert_stone;
 264
 265                         dp.diagonal_dirs = true;
 266                         dp.mossratio     = 0.0;
 267                         dp.holesize      = v3s16(2, 3, 2);
 268                         dp.roomsize      = v3s16(2, 5, 2);
 269                         dp.notifytype    = GENNOTIFY_TEMPLE;
 270                 } else if (stone_type == MGSTONE_SANDSTONE) {
 271                         dp.c_cobble = c_sandstonebrick;
 272                         dp.c_moss   = c_sandstonebrick;
 273                         dp.c_stair  = c_sandstonebrick;
 274
 275                         dp.diagonal_dirs = false;
 276                         dp.mossratio     = 0.0;
 277                         dp.holesize      = v3s16(2, 2, 2);
 278                         dp.roomsize      = v3s16(2, 0, 2);
 279                         dp.notifytype    = GENNOTIFY_DUNGEON;
 280                 }
 281
 282                 DungeonGen dgen(this, &dp);
 283                 dgen.generate(blockseed, full_node_min, full_node_max);
 284         }
 285
 286         // Generate the registered decorations
 287         if (flags & MG_DECORATIONS)
 288                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 289
 290         // Generate the registered ores
 291         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 292
 293         // Sprinkle some dust on top after everything else was generated
 294         dustTopNodes();
 295
 296         //printf("makeChunk: %dms\n", t.stop());
 297
 298         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 299
 300         if (flags & MG_LIGHT)
 301                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 302                         full_node_min, full_node_max);
 303
 304         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 305         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 306
 307         this->generating = false;
 308 }
 309
 310
 311 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 312 {
 313         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 314         hselect = rangelim(hselect, 0.0, 1.0);
 315
 316         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 317
 318         noise_terrain_base->np.persist = persist;
 319         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 320
 321         noise_terrain_alt->np.persist = persist;
 322         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 323
 324         if (height_alt > height_base)
 325                 return height_alt;
 326
 327         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 328 }
 329
 330
 331 float MapgenV7::baseTerrainLevelFromMap(int index)
 332 {
 333         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 334         float height_base = noise_terrain_base->result[index];
 335         float height_alt  = noise_terrain_alt->result[index];
 336
 337         if (height_alt > height_base)
 338                 return height_alt;
 339
 340         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 341 }
 342
 343
 344 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 345 {
 346         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 347         float density_gradient = -((float)y / mnt_h_n);
 348         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 349
 350         return mnt_n + density_gradient >= 0.0;
 351 }
 352
 353
 354 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 355 {
 356         float mounthn = noise_mount_height->result[idx_xz];
 357         float density_gradient = -((float)y / mounthn);
 358         float mountn = noise_mountain->result[idx_xyz];
 359
 360         return mountn + density_gradient >= 0.0;
 361 }
 362
 363
 364 int MapgenV7::generateTerrain()
 365 {
 366         MapNode n_air(CONTENT_AIR);
 367         MapNode n_stone(c_stone);
 368         MapNode n_water(c_water_source);
 369
 370         //// Calculate noise for terrain generation
 371         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 372         float *persistmap = noise_terrain_persist->result;
 373
 374         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 375         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 376         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 377
 378         if (spflags & MGV7_MOUNTAINS) {
 379                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 380                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 381         }
 382
 383         //// Place nodes
 384         v3s16 em = vm->m_area.getExtent();
 385         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 386         u32 index2d = 0;
 387
 388         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 389         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 390                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 391                 heightmap[index2d] = surface_y;  // Create base terrain heightmap
 392
 393                 if (surface_y > stone_surface_max_y)
 394                         stone_surface_max_y = surface_y;
 395
 396                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 397                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 398
 399                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 400                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 401                                 if (y <= surface_y) {
 402                                         vm->m_data[vi] = n_stone;  // Base terrain
 403                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 404                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 405                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 406                                         if (y > stone_surface_max_y)
 407                                                 stone_surface_max_y = y;
 408                                 } else if (y <= water_level) {
 409                                         vm->m_data[vi] = n_water;
 410                                 } else {
 411                                         vm->m_data[vi] = n_air;
 412                                 }
 413                         }
 414                         vm->m_area.add_y(em, vi, 1);
 415                         index3d += ystride;
 416                 }
 417         }
 418
 419         return stone_surface_max_y;
 420 }
 421
 422
 423 void MapgenV7::generateRidgeTerrain()
 424 {
 425         if (node_max.Y < water_level - 16)
 426                 return;
 427
 428         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 429         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 430
 431         MapNode n_water(c_water_source);
 432         MapNode n_air(CONTENT_AIR);
 433         u32 index = 0;
 434         float width = 0.2;
 435
 436         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 437         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 438                 u32 vi = vm->m_area.index(node_min.X, y, z);
 439                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 440                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 441
 442                         if (heightmap[j] < water_level - 16)  // Use base terrain heightmap
 443                                 continue;
 444
 445                         float uwatern = noise_ridge_uwater->result[j] * 2;
 446                         if (fabs(uwatern) > width)
 447                                 continue;
 448
 449                         float altitude = y - water_level;
 450                         float height_mod = (altitude + 17) / 2.5;
 451                         float width_mod  = width - fabs(uwatern);
 452                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 453
 454                         if (nridge + width_mod * height_mod < 0.6)
 455                                 continue;
 456
 457                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 458                 }
 459         }
 460 }
 461
 462
 463 ////////////////////////////////////////////////////////////////////////////////
 464 //// Code Boneyard
 465 ////
 466 //// Much of the stuff here has potential to become useful again at some point
 467 //// in the future, but we don't want it to get lost or forgotten in version
 468 //// control.
 469 ////
 470
 471 #if 0
 472 int MapgenV7::generateMountainTerrain(s16 ymax)
 473 {
 474         MapNode n_stone(c_stone);
 475         u32 j = 0;
 476
 477         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 478         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 479                 u32 vi = vm->m_area.index(node_min.X, y, z);
 480                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 481                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 482                         content_t c = vm->m_data[vi].getContent();
 483
 484                         if (getMountainTerrainFromMap(j, index, y)
 485                                         && (c == CONTENT_AIR || c == c_water_source)) {
 486                                 vm->m_data[vi] = n_stone;
 487                                 if (y > ymax)
 488                                         ymax = y;
 489                         }
 490
 491                         vi++;
 492                         j++;
 493                 }
 494         }
 495
 496         return ymax;
 497 }
 498 #endif
 499
 500
 501 #if 0
 502 void MapgenV7::carveRivers() {
 503         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 504         MapNode n_stone(c_stone);
 505         u32 index = 0;
 506
 507         int river_depth = 4;
 508
 509         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 510         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 511                 float terrain_mod  = noise_terrain_mod->result[index];
 512                 NoiseParams *np = noise_terrain_river->np;
 513                 np.persist = noise_terrain_persist->result[index];
 514                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 515                 float height = terrain_river * (1 - abs(terrain_mod)) *
 516                                                 noise_terrain_river->np.scale;
 517                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 518
 519                 s16 y = heightmap[index];
 520                 if (height < 1.0 && y > river_depth &&
 521                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 522
 523                         for (s16 ry = y; ry != y - river_depth; ry--) {
 524                                 u32 vi = vm->m_area.index(x, ry, z);
 525                                 vm->m_data[vi] = n_air;
 526                         }
 527
 528                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 529                         vm->m_data[vi] = n_water_source;
 530                 }
 531         }
 532 }
 533 #endif
 534
 535
 536 #if 0
 537 void MapgenV7::addTopNodes()
 538 {
 539         v3s16 em = vm->m_area.getExtent();
 540         s16 ntopnodes;
 541         u32 index = 0;
 542
 543         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 544         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 545                 Biome *biome = bmgr->biomes[biomemap[index]];
 546
 547                 //////////////////// First, add top nodes below the ridge
 548                 s16 y = ridge_heightmap[index];
 549
 550                 // This cutoff is good enough, but not perfect.
 551                 // It will cut off potentially placed top nodes at chunk boundaries
 552                 if (y < node_min.Y)
 553                         continue;
 554                 if (y > node_max.Y) {
 555                         y = node_max.Y; // Let's see if we can still go downward anyway
 556                         u32 vi = vm->m_area.index(x, y, z);
 557                         content_t c = vm->m_data[vi].getContent();
 558                         if (ndef->get(c).walkable)
 559                                 continue;
 560                 }
 561
 562                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 563                 // might not be the actual height, just the lowest part in the chunk
 564                 // where a ridge had been carved
 565                 u32 i = vm->m_area.index(x, y, z);
 566                 for (; y >= node_min.Y; y--) {
 567                         content_t c = vm->m_data[i].getContent();
 568                         if (ndef->get(c).walkable)
 569                                 break;
 570                         vm->m_area.add_y(em, i, -1);
 571                 }
 572
 573                 if (y != node_min.Y - 1 && y >= water_level) {
 574                         ridge_heightmap[index] = y; //update ridgeheight
 575                         ntopnodes = biome->top_depth;
 576                         for (; y <= node_max.Y && ntopnodes; y++) {
 577                                 ntopnodes--;
 578                                 vm->m_data[i] = MapNode(biome->c_top);
 579                                 vm->m_area.add_y(em, i, 1);
 580                         }
 581                         // If dirt, grow grass on it.
 582                         if (y > water_level - 10 &&
 583                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 584                                 vm->m_area.add_y(em, i, -1);
 585                                 if (vm->m_data[i].getContent() == c_dirt)
 586                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 587                         }
 588                 }
 589
 590                 //////////////////// Now, add top nodes on top of the ridge
 591                 y = heightmap[index];
 592                 if (y > node_max.Y) {
 593                         y = node_max.Y; // Let's see if we can still go downward anyway
 594                         u32 vi = vm->m_area.index(x, y, z);
 595                         content_t c = vm->m_data[vi].getContent();
 596                         if (ndef->get(c).walkable)
 597                                 continue;
 598                 }
 599
 600                 i = vm->m_area.index(x, y, z);
 601                 for (; y >= node_min.Y; y--) {
 602                         content_t c = vm->m_data[i].getContent();
 603                         if (ndef->get(c).walkable)
 604                                 break;
 605                         vm->m_area.add_y(em, i, -1);
 606                 }
 607
 608                 if (y != node_min.Y - 1) {
 609                         ntopnodes = biome->top_depth;
 610                         // Let's see if we've already added it...
 611                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 612                                 continue;
 613
 614                         for (; y <= node_max.Y && ntopnodes; y++) {
 615                                 ntopnodes--;
 616                                 vm->m_data[i] = MapNode(biome->c_top);
 617                                 vm->m_area.add_y(em, i, 1);
 618                         }
 619                         // If dirt, grow grass on it.
 620                         if (y > water_level - 10 &&
 621                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 622                                 vm->m_area.add_y(em, i, -1);
 623                                 if (vm->m_data[i].getContent() == c_dirt)
 624                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 625                         }
 626                 }
 627         }
 628 }
 629 #endif