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 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 + 2);
  62
  63         this->biomemap        = new u8[csize.X * csize.Z];
  64         this->heightmap       = new s16[csize.X * csize.Z];
  65         this->heatmap         = NULL;
  66         this->humidmap        = NULL;
  67         this->ridge_heightmap = new s16[csize.X * csize.Z];
  68
  69         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  70         this->spflags = sp->spflags;
  71
  72         //// Terrain noise
  73         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  74         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  75         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  76         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  77         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  78         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  79         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  80
  81         //// 3d terrain noise
  82         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  83         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  84         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y + 2, csize.Z);
  85         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y + 2, csize.Z);
  86
  87         //// Biome noise
  88         noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
  89         noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
  90         noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
  91         noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
  92
  93         //// Resolve nodes to be used
  94         INodeDefManager *ndef = emerge->ndef;
  95
  96         c_stone                = ndef->getId("mapgen_stone");
  97         c_water_source         = ndef->getId("mapgen_water_source");
  98         c_lava_source          = ndef->getId("mapgen_lava_source");
  99         c_desert_stone         = ndef->getId("mapgen_desert_stone");
 100         c_ice                  = ndef->getId("mapgen_ice");
 101         c_sandstone            = ndef->getId("mapgen_sandstone");
 102
 103         c_cobble               = ndef->getId("mapgen_cobble");
 104         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 105         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 106         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 107         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 108
 109         if (c_ice == CONTENT_IGNORE)
 110                 c_ice = CONTENT_AIR;
 111         if (c_mossycobble == CONTENT_IGNORE)
 112                 c_mossycobble = c_cobble;
 113         if (c_stair_cobble == CONTENT_IGNORE)
 114                 c_stair_cobble = c_cobble;
 115         if (c_sandstonebrick == CONTENT_IGNORE)
 116                 c_sandstonebrick = c_sandstone;
 117         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 118                 c_stair_sandstonebrick = c_sandstone;
 119 }
 120
 121
 122 MapgenV7::~MapgenV7()
 123 {
 124         delete noise_terrain_base;
 125         delete noise_terrain_persist;
 126         delete noise_height_select;
 127         delete noise_terrain_alt;
 128         delete noise_filler_depth;
 129         delete noise_mount_height;
 130         delete noise_ridge_uwater;
 131         delete noise_mountain;
 132         delete noise_ridge;
 133         delete noise_cave1;
 134         delete noise_cave2;
 135
 136         delete noise_heat;
 137         delete noise_humidity;
 138         delete noise_heat_blend;
 139         delete noise_humidity_blend;
 140
 141         delete[] ridge_heightmap;
 142         delete[] heightmap;
 143         delete[] biomemap;
 144 }
 145
 146
 147 MapgenV7Params::MapgenV7Params()
 148 {
 149         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 150
 151         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 152         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 153         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 154         np_height_select   = NoiseParams(-12,  24,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 155         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 156         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 157         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 158         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 159         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 160         np_cave1           = NoiseParams(0,    12,  v3f(100,  100,  100),  52534, 4, 0.5,  2.0);
 161         np_cave2           = NoiseParams(0,    12,  v3f(100,  100,  100),  10325, 4, 0.5,  2.0);
 162 }
 163
 164
 165 void MapgenV7Params::readParams(const Settings *settings)
 166 {
 167         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 168
 169         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 170         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 171         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 172         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 173         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 174         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 175         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 176         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 177         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 178         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 179         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 180 }
 181
 182
 183 void MapgenV7Params::writeParams(Settings *settings) const
 184 {
 185         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, U32_MAX);
 186
 187         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 188         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 189         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 190         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 191         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 192         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 193         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 194         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 195         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 196         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 197         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 198 }
 199
 200
 201 ///////////////////////////////////////
 202
 203
 204 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 205 {
 206         // Base terrain calculation
 207         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 208
 209         // Ridge/river terrain calculation
 210         float width = 0.2;
 211         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 212         // actually computing the depth of the ridge is much more expensive;
 213         // if inside a river, simply guess
 214         if (fabs(uwatern) <= width)
 215                 return water_level - 10;
 216
 217         // Mountain terrain calculation
 218         int iters = 128; // don't even bother iterating more than 128 times..
 219         while (iters--) {
 220                 //current point would have been air
 221                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 222                         return y;
 223
 224                 y++;
 225         }
 226
 227         return y;
 228 }
 229
 230
 231 void MapgenV7::makeChunk(BlockMakeData *data)
 232 {
 233         // Pre-conditions
 234         assert(data->vmanip);
 235         assert(data->nodedef);
 236         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 237                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 238                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 239         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 240                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 241                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 242
 243         this->generating = true;
 244         this->vm   = data->vmanip;
 245         this->ndef = data->nodedef;
 246         //TimeTaker t("makeChunk");
 247
 248         v3s16 blockpos_min = data->blockpos_min;
 249         v3s16 blockpos_max = data->blockpos_max;
 250         node_min = blockpos_min * MAP_BLOCKSIZE;
 251         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 252         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 253         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 254
 255         blockseed = getBlockSeed2(full_node_min, seed);
 256
 257         // Make some noise
 258         calculateNoise();
 259
 260         // Generate base terrain, mountains, and ridges with initial heightmaps
 261         s16 stone_surface_max_y = generateTerrain();
 262
 263         // Create heightmap
 264         updateHeightmap(node_min, node_max);
 265
 266         // Create biomemap at heightmap surface
 267         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 268                 noise_humidity->result, heightmap, biomemap);
 269
 270         // Actually place the biome-specific nodes
 271         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 272
 273         if (flags & MG_CAVES)
 274                 generateCaves(stone_surface_max_y);
 275
 276         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 277                 DungeonParams dp;
 278
 279                 dp.np_rarity  = nparams_dungeon_rarity;
 280                 dp.np_density = nparams_dungeon_density;
 281                 dp.np_wetness = nparams_dungeon_wetness;
 282                 dp.c_water    = c_water_source;
 283                 if (stone_type == STONE) {
 284                         dp.c_cobble = c_cobble;
 285                         dp.c_moss   = c_mossycobble;
 286                         dp.c_stair  = c_stair_cobble;
 287
 288                         dp.diagonal_dirs = false;
 289                         dp.mossratio     = 3.0;
 290                         dp.holesize      = v3s16(1, 2, 1);
 291                         dp.roomsize      = v3s16(0, 0, 0);
 292                         dp.notifytype    = GENNOTIFY_DUNGEON;
 293                 } else if (stone_type == DESERT_STONE) {
 294                         dp.c_cobble = c_desert_stone;
 295                         dp.c_moss   = c_desert_stone;
 296                         dp.c_stair  = c_desert_stone;
 297
 298                         dp.diagonal_dirs = true;
 299                         dp.mossratio     = 0.0;
 300                         dp.holesize      = v3s16(2, 3, 2);
 301                         dp.roomsize      = v3s16(2, 5, 2);
 302                         dp.notifytype    = GENNOTIFY_TEMPLE;
 303                 } else if (stone_type == SANDSTONE) {
 304                         dp.c_cobble = c_sandstonebrick;
 305                         dp.c_moss   = c_sandstonebrick;
 306                         dp.c_stair  = c_sandstonebrick;
 307
 308                         dp.diagonal_dirs = false;
 309                         dp.mossratio     = 0.0;
 310                         dp.holesize      = v3s16(2, 2, 2);
 311                         dp.roomsize      = v3s16(2, 0, 2);
 312                         dp.notifytype    = GENNOTIFY_DUNGEON;
 313                 }
 314
 315                 DungeonGen dgen(this, &dp);
 316                 dgen.generate(blockseed, full_node_min, full_node_max);
 317         }
 318
 319         // Generate the registered decorations
 320         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 321
 322         // Generate the registered ores
 323         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 324
 325         // Sprinkle some dust on top after everything else was generated
 326         dustTopNodes();
 327
 328         //printf("makeChunk: %dms\n", t.stop());
 329
 330         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 331
 332         if (flags & MG_LIGHT)
 333                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 334                         full_node_min, full_node_max);
 335
 336         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 337         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 338
 339         this->generating = false;
 340 }
 341
 342
 343 void MapgenV7::calculateNoise()
 344 {
 345         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 346         int x = node_min.X;
 347         int y = node_min.Y - 1;
 348         int z = node_min.Z;
 349
 350         noise_terrain_persist->perlinMap2D(x, z);
 351         float *persistmap = noise_terrain_persist->result;
 352
 353         noise_terrain_base->perlinMap2D(x, z, persistmap);
 354         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 355         noise_height_select->perlinMap2D(x, z);
 356
 357         if (flags & MG_CAVES) {
 358                 noise_cave1->perlinMap3D(x, y, z);
 359                 noise_cave2->perlinMap3D(x, y, z);
 360         }
 361
 362         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 363                 noise_ridge->perlinMap3D(x, y, z);
 364                 noise_ridge_uwater->perlinMap2D(x, z);
 365         }
 366
 367         // Mountain noises are calculated in generateMountainTerrain()
 368
 369         noise_filler_depth->perlinMap2D(x, z);
 370         noise_heat->perlinMap2D(x, z);
 371         noise_humidity->perlinMap2D(x, z);
 372         noise_heat_blend->perlinMap2D(x, z);
 373         noise_humidity_blend->perlinMap2D(x, z);
 374
 375         for (s32 i = 0; i < csize.X * csize.Z; i++) {
 376                 noise_heat->result[i] += noise_heat_blend->result[i];
 377                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 378         }
 379
 380         heatmap = noise_heat->result;
 381         humidmap = noise_humidity->result;
 382         //printf("calculateNoise: %dus\n", t.stop());
 383 }
 384
 385
 386 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 387 {
 388         float heat = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed) +
 389                 NoisePerlin2D(&noise_heat_blend->np, p.X, p.Z, seed);
 390         float humidity = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed) +
 391                 NoisePerlin2D(&noise_humidity_blend->np, p.X, p.Z, seed);
 392         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 393
 394         return bmgr->getBiome(heat, humidity, groundlevel);
 395 }
 396
 397 //needs to be updated
 398 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 399 {
 400         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 401         hselect = rangelim(hselect, 0.0, 1.0);
 402
 403         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 404
 405         noise_terrain_base->np.persist = persist;
 406         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 407
 408         noise_terrain_alt->np.persist = persist;
 409         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 410
 411         if (height_alt > height_base)
 412                 return height_alt;
 413
 414         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 415 }
 416
 417
 418 float MapgenV7::baseTerrainLevelFromMap(int index)
 419 {
 420         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 421         float height_base = noise_terrain_base->result[index];
 422         float height_alt  = noise_terrain_alt->result[index];
 423
 424         if (height_alt > height_base)
 425                 return height_alt;
 426
 427         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 428 }
 429
 430
 431 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 432 {
 433         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 434         float density_gradient = -((float)y / mnt_h_n);
 435         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 436
 437         return mnt_n + density_gradient >= 0.0;
 438 }
 439
 440
 441 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 442 {
 443         float mounthn = noise_mount_height->result[idx_xz];
 444         float density_gradient = -((float)y / mounthn);
 445         float mountn = noise_mountain->result[idx_xyz];
 446
 447         return mountn + density_gradient >= 0.0;
 448 }
 449
 450
 451 #if 0
 452 void MapgenV7::carveRivers() {
 453         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 454         MapNode n_stone(c_stone);
 455         u32 index = 0;
 456
 457         int river_depth = 4;
 458
 459         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 460         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 461                 float terrain_mod  = noise_terrain_mod->result[index];
 462                 NoiseParams *np = noise_terrain_river->np;
 463                 np.persist = noise_terrain_persist->result[index];
 464                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 465                 float height = terrain_river * (1 - abs(terrain_mod)) *
 466                                                 noise_terrain_river->np.scale;
 467                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 468
 469                 s16 y = heightmap[index];
 470                 if (height < 1.0 && y > river_depth &&
 471                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 472
 473                         for (s16 ry = y; ry != y - river_depth; ry--) {
 474                                 u32 vi = vm->m_area.index(x, ry, z);
 475                                 vm->m_data[vi] = n_air;
 476                         }
 477
 478                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 479                         vm->m_data[vi] = n_water_source;
 480                 }
 481         }
 482 }
 483 #endif
 484
 485
 486 int MapgenV7::generateTerrain()
 487 {
 488         s16 stone_surface_min_y;
 489         s16 stone_surface_max_y;
 490
 491         generateBaseTerrain(&stone_surface_min_y, &stone_surface_max_y);
 492
 493         if ((spflags & MGV7_MOUNTAINS) && stone_surface_min_y < node_max.Y)
 494                 stone_surface_max_y = generateMountainTerrain(stone_surface_max_y);
 495
 496         if (spflags & MGV7_RIDGES)
 497                 generateRidgeTerrain();
 498
 499         return stone_surface_max_y;
 500 }
 501
 502
 503 void MapgenV7::generateBaseTerrain(s16 *stone_surface_min_y, s16 *stone_surface_max_y)
 504 {
 505         MapNode n_air(CONTENT_AIR);
 506         MapNode n_stone(c_stone);
 507         MapNode n_water(c_water_source);
 508
 509         v3s16 em = vm->m_area.getExtent();
 510         s16 surface_min_y = MAX_MAP_GENERATION_LIMIT;
 511         s16 surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 512         u32 index = 0;
 513
 514         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 515         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 516                 float surface_height = baseTerrainLevelFromMap(index);
 517                 s16 surface_y = (s16)surface_height;
 518
 519                 heightmap[index]       = surface_y;
 520                 ridge_heightmap[index] = surface_y;
 521
 522                 if (surface_y < surface_min_y)
 523                         surface_min_y = surface_y;
 524
 525                 if (surface_y > surface_max_y)
 526                         surface_max_y = surface_y;
 527
 528                 u32 i = vm->m_area.index(x, node_min.Y - 1, z);
 529                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 530                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 531                                 if (y <= surface_y)
 532                                         vm->m_data[i] = n_stone;
 533                                 else if (y <= water_level)
 534                                         vm->m_data[i] = n_water;
 535                                 else
 536                                         vm->m_data[i] = n_air;
 537                         }
 538                         vm->m_area.add_y(em, i, 1);
 539                 }
 540         }
 541
 542         *stone_surface_min_y = surface_min_y;
 543         *stone_surface_max_y = surface_max_y;
 544 }
 545
 546
 547 int MapgenV7::generateMountainTerrain(s16 ymax)
 548 {
 549         noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 550         noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 551
 552         MapNode n_stone(c_stone);
 553         u32 j = 0;
 554
 555         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 556         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 557                 u32 vi = vm->m_area.index(node_min.X, y, z);
 558                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 559                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 560                         content_t c = vm->m_data[vi].getContent();
 561
 562                         if (getMountainTerrainFromMap(j, index, y)
 563                                         && (c == CONTENT_AIR || c == c_water_source)) {
 564                                 vm->m_data[vi] = n_stone;
 565                                 if (y > ymax)
 566                                         ymax = y;
 567                         }
 568
 569                         vi++;
 570                         j++;
 571                 }
 572         }
 573
 574         return ymax;
 575 }
 576
 577
 578 void MapgenV7::generateRidgeTerrain()
 579 {
 580         if (node_max.Y < water_level)
 581                 return;
 582
 583         MapNode n_water(c_water_source);
 584         MapNode n_air(CONTENT_AIR);
 585         u32 index = 0;
 586         float width = 0.2; // TODO: figure out acceptable perlin noise values
 587
 588         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 589         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 590                 u32 vi = vm->m_area.index(node_min.X, y, z);
 591                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 592                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 593
 594                         if (heightmap[j] < water_level - 16)
 595                                 continue;
 596
 597                         float uwatern = noise_ridge_uwater->result[j] * 2;
 598                         if (fabs(uwatern) > width)
 599                                 continue;
 600
 601                         float altitude = y - water_level;
 602                         float height_mod = (altitude + 17) / 2.5;
 603                         float width_mod  = width - fabs(uwatern);
 604                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 605
 606                         if (nridge + width_mod * height_mod < 0.6)
 607                                 continue;
 608
 609                         if (y < ridge_heightmap[j])
 610                                 ridge_heightmap[j] = y - 1;
 611
 612                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 613                 }
 614         }
 615 }
 616
 617
 618 MgStoneType MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 619 {
 620         v3s16 em = vm->m_area.getExtent();
 621         u32 index = 0;
 622         MgStoneType stone_type = STONE;
 623
 624         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 625         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 626                 Biome *biome = NULL;
 627                 u16 depth_top = 0;
 628                 u16 base_filler = 0;
 629                 u16 depth_water_top = 0;
 630                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 631
 632                 // Check node at base of mapchunk above, either a node of a previously
 633                 // generated mapchunk or if not, a node of overgenerated base terrain.
 634                 content_t c_above = vm->m_data[vi + em.X].getContent();
 635                 bool air_above = c_above == CONTENT_AIR;
 636                 bool water_above = c_above == c_water_source;
 637
 638                 // If there is air or water above enable top/filler placement, otherwise force
 639                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 640                 u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
 641
 642                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 643                         content_t c = vm->m_data[vi].getContent();
 644
 645                         // Biome is recalculated each time an upper surface is detected while
 646                         // working down a column. The selected biome then remains in effect for
 647                         // all nodes below until the next surface and biome recalculation.
 648                         // Biome is recalculated:
 649                         // 1. At the surface of stone below air or water.
 650                         // 2. At the surface of water below air.
 651                         // 3. When stone or water is detected but biome has not yet been calculated.
 652                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 653                                         (c == c_water_source && (air_above || !biome))) {
 654                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 655                                 depth_top = biome->depth_top;
 656                                 base_filler = MYMAX(depth_top + biome->depth_filler
 657                                                 + noise_filler_depth->result[index], 0);
 658                                 depth_water_top = biome->depth_water_top;
 659
 660                                 // Detect stone type for dungeons during every biome calculation.
 661                                 // This is more efficient than detecting per-node and will not
 662                                 // miss any desert stone or sandstone biomes.
 663                                 if (biome->c_stone == c_desert_stone)
 664                                         stone_type = DESERT_STONE;
 665                                 else if (biome->c_stone == c_sandstone)
 666                                         stone_type = SANDSTONE;
 667                         }
 668
 669                         if (c == c_stone) {
 670                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 671
 672                                 // If the node below isn't solid, make this node stone, so that
 673                                 // any top/filler nodes above are structurally supported.
 674                                 // This is done by aborting the cycle of top/filler placement
 675                                 // immediately by forcing nplaced to stone level.
 676                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 677                                         nplaced = U16_MAX;
 678
 679                                 if (nplaced < depth_top) {
 680                                         vm->m_data[vi] = MapNode(biome->c_top);
 681                                         nplaced++;
 682                                 } else if (nplaced < base_filler) {
 683                                         vm->m_data[vi] = MapNode(biome->c_filler);
 684                                         nplaced++;
 685                                 } else {
 686                                         vm->m_data[vi] = MapNode(biome->c_stone);
 687                                 }
 688
 689                                 air_above = false;
 690                                 water_above = false;
 691                         } else if (c == c_water_source) {
 692                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 693                                                 biome->c_water_top : biome->c_water);
 694                                 nplaced = 0;  // Enable top/filler placement for next surface
 695                                 air_above = false;
 696                                 water_above = true;
 697                         } else if (c == CONTENT_AIR) {
 698                                 nplaced = 0;  // Enable top/filler placement for next surface
 699                                 air_above = true;
 700                                 water_above = false;
 701                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 702                                 nplaced = U16_MAX;  // Disable top/filler placement
 703                                 air_above = false;
 704                                 water_above = false;
 705                         }
 706
 707                         vm->m_area.add_y(em, vi, -1);
 708                 }
 709         }
 710
 711         return stone_type;
 712 }
 713
 714
 715 void MapgenV7::dustTopNodes()
 716 {
 717         if (node_max.Y < water_level)
 718                 return;
 719
 720         v3s16 em = vm->m_area.getExtent();
 721         u32 index = 0;
 722
 723         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 724         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 725                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 726
 727                 if (biome->c_dust == CONTENT_IGNORE)
 728                         continue;
 729
 730                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 731                 content_t c_full_max = vm->m_data[vi].getContent();
 732                 s16 y_start;
 733
 734                 if (c_full_max == CONTENT_AIR) {
 735                         y_start = full_node_max.Y - 1;
 736                 } else if (c_full_max == CONTENT_IGNORE) {
 737                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 738                         content_t c_max = vm->m_data[vi].getContent();
 739
 740                         if (c_max == CONTENT_AIR)
 741                                 y_start = node_max.Y;
 742                         else
 743                                 continue;
 744                 } else {
 745                         continue;
 746                 }
 747
 748                 vi = vm->m_area.index(x, y_start, z);
 749                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 750                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 751                                 break;
 752
 753                         vm->m_area.add_y(em, vi, -1);
 754                 }
 755
 756                 content_t c = vm->m_data[vi].getContent();
 757                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 758                         vm->m_area.add_y(em, vi, 1);
 759                         vm->m_data[vi] = MapNode(biome->c_dust);
 760                 }
 761         }
 762 }
 763
 764
 765 #if 0
 766 void MapgenV7::addTopNodes()
 767 {
 768         v3s16 em = vm->m_area.getExtent();
 769         s16 ntopnodes;
 770         u32 index = 0;
 771
 772         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 773         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 774                 Biome *biome = bmgr->biomes[biomemap[index]];
 775
 776                 //////////////////// First, add top nodes below the ridge
 777                 s16 y = ridge_heightmap[index];
 778
 779                 // This cutoff is good enough, but not perfect.
 780                 // It will cut off potentially placed top nodes at chunk boundaries
 781                 if (y < node_min.Y)
 782                         continue;
 783                 if (y > node_max.Y) {
 784                         y = node_max.Y; // Let's see if we can still go downward anyway
 785                         u32 vi = vm->m_area.index(x, y, z);
 786                         content_t c = vm->m_data[vi].getContent();
 787                         if (ndef->get(c).walkable)
 788                                 continue;
 789                 }
 790
 791                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 792                 // might not be the actual height, just the lowest part in the chunk
 793                 // where a ridge had been carved
 794                 u32 i = vm->m_area.index(x, y, z);
 795                 for (; y >= node_min.Y; y--) {
 796                         content_t c = vm->m_data[i].getContent();
 797                         if (ndef->get(c).walkable)
 798                                 break;
 799                         vm->m_area.add_y(em, i, -1);
 800                 }
 801
 802                 if (y != node_min.Y - 1 && y >= water_level) {
 803                         ridge_heightmap[index] = y; //update ridgeheight
 804                         ntopnodes = biome->top_depth;
 805                         for (; y <= node_max.Y && ntopnodes; y++) {
 806                                 ntopnodes--;
 807                                 vm->m_data[i] = MapNode(biome->c_top);
 808                                 vm->m_area.add_y(em, i, 1);
 809                         }
 810                         // If dirt, grow grass on it.
 811                         if (y > water_level - 10 &&
 812                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 813                                 vm->m_area.add_y(em, i, -1);
 814                                 if (vm->m_data[i].getContent() == c_dirt)
 815                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 816                         }
 817                 }
 818
 819                 //////////////////// Now, add top nodes on top of the ridge
 820                 y = heightmap[index];
 821                 if (y > node_max.Y) {
 822                         y = node_max.Y; // Let's see if we can still go downward anyway
 823                         u32 vi = vm->m_area.index(x, y, z);
 824                         content_t c = vm->m_data[vi].getContent();
 825                         if (ndef->get(c).walkable)
 826                                 continue;
 827                 }
 828
 829                 i = vm->m_area.index(x, y, z);
 830                 for (; y >= node_min.Y; y--) {
 831                         content_t c = vm->m_data[i].getContent();
 832                         if (ndef->get(c).walkable)
 833                                 break;
 834                         vm->m_area.add_y(em, i, -1);
 835                 }
 836
 837                 if (y != node_min.Y - 1) {
 838                         ntopnodes = biome->top_depth;
 839                         // Let's see if we've already added it...
 840                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 841                                 continue;
 842
 843                         for (; y <= node_max.Y && ntopnodes; y++) {
 844                                 ntopnodes--;
 845                                 vm->m_data[i] = MapNode(biome->c_top);
 846                                 vm->m_area.add_y(em, i, 1);
 847                         }
 848                         // If dirt, grow grass on it.
 849                         if (y > water_level - 10 &&
 850                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 851                                 vm->m_area.add_y(em, i, -1);
 852                                 if (vm->m_data[i].getContent() == c_dirt)
 853                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 854                         }
 855                 }
 856         }
 857 }
 858 #endif
 859
 860
 861 void MapgenV7::generateCaves(s16 max_stone_y)
 862 {
 863         if (max_stone_y >= node_min.Y) {
 864                 u32 index   = 0;
 865
 866                 for (s16 z = node_min.Z; z <= node_max.Z; z++)
 867                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 868                         u32 i = vm->m_area.index(node_min.X, y, z);
 869                         for (s16 x = node_min.X; x <= node_max.X; x++, i++, index++) {
 870                                 float d1 = contour(noise_cave1->result[index]);
 871                                 float d2 = contour(noise_cave2->result[index]);
 872                                 if (d1 * d2 > 0.3) {
 873                                         content_t c = vm->m_data[i].getContent();
 874                                         if (!ndef->get(c).is_ground_content || c == CONTENT_AIR)
 875                                                 continue;
 876
 877                                         vm->m_data[i] = MapNode(CONTENT_AIR);
 878                                 }
 879                         }
 880                 }
 881         }
 882
 883         PseudoRandom ps(blockseed + 21343);
 884         u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
 885         for (u32 i = 0; i < bruises_count; i++) {
 886                 CaveV7 cave(this, &ps);
 887                 cave.makeCave(node_min, node_max, max_stone_y);
 888         }
 889 }