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