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 "emerge.h"
  33 #include "dungeongen.h"
  34 #include "cavegen.h"
  35 #include "treegen.h"
  36 #include "mg_biome.h"
  37 #include "mg_ore.h"
  38 #include "mg_decoration.h"
  39 #include "mapgen_v7.h"
  40
  41
  42 FlagDesc flagdesc_mapgen_v7[] = {
  43         {"mountains", MGV7_MOUNTAINS},
  44         {"ridges",    MGV7_RIDGES},
  45         {NULL,        0}
  46 };
  47
  48 ///////////////////////////////////////////////////////////////////////////////
  49
  50
  51 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  52         : Mapgen(mapgenid, params, emerge)
  53 {
  54         this->m_emerge = emerge;
  55         this->bmgr     = emerge->biomemgr;
  56
  57         //// amount of elements to skip for the next index
  58         //// for noise/height/biome maps (not vmanip)
  59         this->ystride = csize.X;
  60         this->zstride = csize.X * (csize.Y + 2);
  61
  62         this->biomemap  = new u8[csize.X * csize.Z];
  63         this->heightmap = new s16[csize.X * csize.Z];
  64         this->ridge_heightmap = new s16[csize.X * csize.Z];
  65
  66         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  67         this->spflags = sp->spflags;
  68
  69         //// Terrain noise
  70         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  71         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  72         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  73         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  74         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  75         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  76         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  77
  78         //// 3d terrain noise
  79         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  80         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  81         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y + 2, csize.Z);
  82         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y + 2, csize.Z);
  83
  84         //// Biome noise
  85         noise_heat     = new Noise(&params->np_biome_heat,     seed, csize.X, csize.Z);
  86         noise_humidity = new Noise(&params->np_biome_humidity, seed, csize.X, csize.Z);
  87
  88         //// Resolve nodes to be used
  89         INodeDefManager *ndef = emerge->ndef;
  90
  91         c_stone                = ndef->getId("mapgen_stone");
  92         c_water_source         = ndef->getId("mapgen_water_source");
  93         c_lava_source          = ndef->getId("mapgen_lava_source");
  94         c_desert_stone         = ndef->getId("mapgen_desert_stone");
  95         c_ice                  = ndef->getId("mapgen_ice");
  96         c_sandstone            = ndef->getId("mapgen_sandstone");
  97
  98         c_cobble               = ndef->getId("mapgen_cobble");
  99         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 100         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 101         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 102         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 103
 104         if (c_ice == CONTENT_IGNORE)
 105                 c_ice = CONTENT_AIR;
 106         if (c_mossycobble == CONTENT_IGNORE)
 107                 c_mossycobble = c_cobble;
 108         if (c_stair_cobble == CONTENT_IGNORE)
 109                 c_stair_cobble = c_cobble;
 110         if (c_sandstonebrick == CONTENT_IGNORE)
 111                 c_sandstonebrick = c_sandstone;
 112         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 113                 c_stair_sandstonebrick = c_sandstone;
 114 }
 115
 116
 117 MapgenV7::~MapgenV7()
 118 {
 119         delete noise_terrain_base;
 120         delete noise_terrain_persist;
 121         delete noise_height_select;
 122         delete noise_terrain_alt;
 123         delete noise_filler_depth;
 124         delete noise_mount_height;
 125         delete noise_ridge_uwater;
 126         delete noise_mountain;
 127         delete noise_ridge;
 128         delete noise_cave1;
 129         delete noise_cave2;
 130
 131         delete noise_heat;
 132         delete noise_humidity;
 133
 134         delete[] ridge_heightmap;
 135         delete[] heightmap;
 136         delete[] biomemap;
 137 }
 138
 139
 140 MapgenV7Params::MapgenV7Params()
 141 {
 142         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 143
 144         np_terrain_base    = NoiseParams(4,    70,  v3f(300, 300, 300), 82341, 6, 0.7,  2.0);
 145         np_terrain_alt     = NoiseParams(4,    25,  v3f(600, 600, 600), 5934,  5, 0.6,  2.0);
 146         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(500, 500, 500), 539,   3, 0.6,  2.0);
 147         np_height_select   = NoiseParams(-0.5, 1,   v3f(250, 250, 250), 4213,  5, 0.69, 2.0);
 148         np_filler_depth    = NoiseParams(0,    1.2, v3f(150, 150, 150), 261,   4, 0.7,  2.0);
 149         np_mount_height    = NoiseParams(100,  30,  v3f(500, 500, 500), 72449, 4, 0.6,  2.0);
 150         np_ridge_uwater    = NoiseParams(0,    1,   v3f(500, 500, 500), 85039, 4, 0.6,  2.0);
 151         np_mountain        = NoiseParams(-0.6, 1,   v3f(250, 350, 250), 5333,  5, 0.68, 2.0);
 152         np_ridge           = NoiseParams(0,    1,   v3f(100, 100, 100), 6467,  4, 0.75, 2.0);
 153         np_cave1           = NoiseParams(0,    12,  v3f(100, 100, 100), 52534, 4, 0.5,  2.0);
 154         np_cave2           = NoiseParams(0,    12,  v3f(100, 100, 100), 10325, 4, 0.5,  2.0);
 155 }
 156
 157
 158 void MapgenV7Params::readParams(const Settings *settings)
 159 {
 160         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 161
 162         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 163         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 164         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 165         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 166         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 167         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 168         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 169         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 170         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 171         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 172         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 173 }
 174
 175
 176 void MapgenV7Params::writeParams(Settings *settings) const
 177 {
 178         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 179
 180         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 181         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 182         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 183         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 184         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 185         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 186         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 187         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 188         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 189         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 190         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 191 }
 192
 193
 194 ///////////////////////////////////////
 195
 196
 197 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 198 {
 199         // Base terrain calculation
 200         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 201
 202         // Ridge/river terrain calculation
 203         float width = 0.2;
 204         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 205         // actually computing the depth of the ridge is much more expensive;
 206         // if inside a river, simply guess
 207         if (fabs(uwatern) <= width)
 208                 return water_level - 10;
 209
 210         // Mountain terrain calculation
 211         int iters = 128; // don't even bother iterating more than 128 times..
 212         while (iters--) {
 213                 //current point would have been air
 214                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 215                         return y;
 216
 217                 y++;
 218         }
 219
 220         return y;
 221 }
 222
 223
 224 void MapgenV7::makeChunk(BlockMakeData *data)
 225 {
 226         // Pre-conditions
 227         assert(data->vmanip);
 228         assert(data->nodedef);
 229         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 230                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 231                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 232         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 233                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 234                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 235
 236         this->generating = true;
 237         this->vm   = data->vmanip;
 238         this->ndef = data->nodedef;
 239         //TimeTaker t("makeChunk");
 240
 241         v3s16 blockpos_min = data->blockpos_min;
 242         v3s16 blockpos_max = data->blockpos_max;
 243         node_min = blockpos_min * MAP_BLOCKSIZE;
 244         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 245         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 246         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 247
 248         blockseed = getBlockSeed2(full_node_min, seed);
 249
 250         // Make some noise
 251         calculateNoise();
 252
 253         // Generate base terrain, mountains, and ridges with initial heightmaps
 254         s16 stone_surface_max_y = generateTerrain();
 255
 256         // Create heightmap
 257         updateHeightmap(node_min, node_max);
 258
 259         // Create biomemap at heightmap surface
 260         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 261                 noise_humidity->result, heightmap, biomemap);
 262
 263         // Actually place the biome-specific nodes
 264         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 265
 266         if (flags & MG_CAVES)
 267                 generateCaves(stone_surface_max_y);
 268
 269         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 270                 DungeonParams dp;
 271
 272                 dp.np_rarity  = nparams_dungeon_rarity;
 273                 dp.np_density = nparams_dungeon_density;
 274                 dp.np_wetness = nparams_dungeon_wetness;
 275                 dp.c_water    = c_water_source;
 276                 if (stone_type == STONE) {
 277                         dp.c_cobble = c_cobble;
 278                         dp.c_moss   = c_mossycobble;
 279                         dp.c_stair  = c_stair_cobble;
 280
 281                         dp.diagonal_dirs = false;
 282                         dp.mossratio     = 3.0;
 283                         dp.holesize      = v3s16(1, 2, 1);
 284                         dp.roomsize      = v3s16(0, 0, 0);
 285                         dp.notifytype    = GENNOTIFY_DUNGEON;
 286                 } else if (stone_type == DESERT_STONE) {
 287                         dp.c_cobble = c_desert_stone;
 288                         dp.c_moss   = c_desert_stone;
 289                         dp.c_stair  = c_desert_stone;
 290
 291                         dp.diagonal_dirs = true;
 292                         dp.mossratio     = 0.0;
 293                         dp.holesize      = v3s16(2, 3, 2);
 294                         dp.roomsize      = v3s16(2, 5, 2);
 295                         dp.notifytype    = GENNOTIFY_TEMPLE;
 296                 } else if (stone_type == SANDSTONE) {
 297                         dp.c_cobble = c_sandstonebrick;
 298                         dp.c_moss   = c_sandstonebrick;
 299                         dp.c_stair  = c_sandstonebrick;
 300
 301                         dp.diagonal_dirs = false;
 302                         dp.mossratio     = 0.0;
 303                         dp.holesize      = v3s16(2, 2, 2);
 304                         dp.roomsize      = v3s16(2, 0, 2);
 305                         dp.notifytype    = GENNOTIFY_DUNGEON;
 306                 }
 307
 308                 DungeonGen dgen(this, &dp);
 309                 dgen.generate(blockseed, full_node_min, full_node_max);
 310         }
 311
 312         // Generate the registered decorations
 313         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 314
 315         // Generate the registered ores
 316         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 317
 318         // Sprinkle some dust on top after everything else was generated
 319         dustTopNodes();
 320
 321         //printf("makeChunk: %dms\n", t.stop());
 322
 323         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 324
 325         if (flags & MG_LIGHT)
 326                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 327                         full_node_min, full_node_max);
 328
 329         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 330         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 331
 332         this->generating = false;
 333 }
 334
 335
 336 void MapgenV7::calculateNoise()
 337 {
 338         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 339         int x = node_min.X;
 340         int y = node_min.Y - 1;
 341         int z = node_min.Z;
 342
 343         noise_terrain_persist->perlinMap2D(x, z);
 344         float *persistmap = noise_terrain_persist->result;
 345
 346         noise_terrain_base->perlinMap2D(x, z, persistmap);
 347         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 348         noise_height_select->perlinMap2D(x, z);
 349
 350         if (flags & MG_CAVES) {
 351                 noise_cave1->perlinMap3D(x, y, z);
 352                 noise_cave2->perlinMap3D(x, y, z);
 353         }
 354
 355         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 356                 noise_ridge->perlinMap3D(x, y, z);
 357                 noise_ridge_uwater->perlinMap2D(x, z);
 358         }
 359
 360         if ((spflags & MGV7_MOUNTAINS) && node_max.Y >= 0) {
 361                 noise_mountain->perlinMap3D(x, y, z);
 362                 noise_mount_height->perlinMap2D(x, z);
 363         }
 364
 365         if (node_max.Y >= water_level) {
 366                 noise_filler_depth->perlinMap2D(x, z);
 367                 noise_heat->perlinMap2D(x, z);
 368                 noise_humidity->perlinMap2D(x, z);
 369         }
 370         //printf("calculateNoise: %dus\n", t.stop());
 371 }
 372
 373
 374 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 375 {
 376         float heat      = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed);
 377         float humidity  = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed);
 378         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 379
 380         return bmgr->getBiome(heat, humidity, groundlevel);
 381 }
 382
 383 //needs to be updated
 384 float MapgenV7::baseTerrainLevelAtPoint(int x, int z)
 385 {
 386         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 387         hselect = rangelim(hselect, 0.0, 1.0);
 388
 389         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 390
 391         noise_terrain_base->np.persist = persist;
 392         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 393
 394         noise_terrain_alt->np.persist = persist;
 395         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 396
 397         if (height_alt > height_base)
 398                 return height_alt;
 399
 400         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 401 }
 402
 403
 404 float MapgenV7::baseTerrainLevelFromMap(int index)
 405 {
 406         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 407         float height_base = noise_terrain_base->result[index];
 408         float height_alt  = noise_terrain_alt->result[index];
 409
 410         if (height_alt > height_base)
 411                 return height_alt;
 412
 413         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 414 }
 415
 416
 417 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z)
 418 {
 419         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 420         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 421         return mnt_n * mnt_h_n >= (float)y;
 422 }
 423
 424
 425 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y)
 426 {
 427         float mounthn = noise_mount_height->result[idx_xz];
 428         float mountn = noise_mountain->result[idx_xyz];
 429         return mountn * mounthn >= (float)y;
 430 }
 431
 432
 433 #if 0
 434 void MapgenV7::carveRivers() {
 435         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 436         MapNode n_stone(c_stone);
 437         u32 index = 0;
 438
 439         int river_depth = 4;
 440
 441         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 442         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 443                 float terrain_mod  = noise_terrain_mod->result[index];
 444                 NoiseParams *np = noise_terrain_river->np;
 445                 np.persist = noise_terrain_persist->result[index];
 446                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 447                 float height = terrain_river * (1 - abs(terrain_mod)) *
 448                                                 noise_terrain_river->np.scale;
 449                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 450
 451                 s16 y = heightmap[index];
 452                 if (height < 1.0 && y > river_depth &&
 453                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 454
 455                         for (s16 ry = y; ry != y - river_depth; ry--) {
 456                                 u32 vi = vm->m_area.index(x, ry, z);
 457                                 vm->m_data[vi] = n_air;
 458                         }
 459
 460                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 461                         vm->m_data[vi] = n_water_source;
 462                 }
 463         }
 464 }
 465 #endif
 466
 467
 468 int MapgenV7::generateTerrain()
 469 {
 470         int ymax = generateBaseTerrain();
 471
 472         if (spflags & MGV7_MOUNTAINS)
 473                 ymax = generateMountainTerrain(ymax);
 474
 475         if (spflags & MGV7_RIDGES)
 476                 generateRidgeTerrain();
 477
 478         return ymax;
 479 }
 480
 481
 482 int MapgenV7::generateBaseTerrain()
 483 {
 484         MapNode n_air(CONTENT_AIR);
 485         MapNode n_stone(c_stone);
 486         MapNode n_water(c_water_source);
 487
 488         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 489         v3s16 em = vm->m_area.getExtent();
 490         u32 index = 0;
 491
 492         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 493         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 494                 float surface_height = baseTerrainLevelFromMap(index);
 495                 s16 surface_y = (s16)surface_height;
 496
 497                 heightmap[index]       = surface_y;
 498                 ridge_heightmap[index] = surface_y;
 499
 500                 if (surface_y > stone_surface_max_y)
 501                         stone_surface_max_y = surface_y;
 502
 503                 u32 i = vm->m_area.index(x, node_min.Y - 1, z);
 504                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 505                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 506                                 if (y <= surface_y)
 507                                         vm->m_data[i] = n_stone;
 508                                 else if (y <= water_level)
 509                                         vm->m_data[i] = n_water;
 510                                 else
 511                                         vm->m_data[i] = n_air;
 512                         }
 513                         vm->m_area.add_y(em, i, 1);
 514                 }
 515         }
 516
 517         return stone_surface_max_y;
 518 }
 519
 520
 521 int MapgenV7::generateMountainTerrain(int ymax)
 522 {
 523         if (node_max.Y < 0)
 524                 return ymax;
 525
 526         MapNode n_stone(c_stone);
 527         u32 j = 0;
 528
 529         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 530         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 531                 u32 vi = vm->m_area.index(node_min.X, y, z);
 532                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 533                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 534                         content_t c = vm->m_data[vi].getContent();
 535
 536                         if (getMountainTerrainFromMap(j, index, y)
 537                                         && (c == CONTENT_AIR || c == c_water_source)) {
 538                                 vm->m_data[vi] = n_stone;
 539                                 if (y > ymax)
 540                                         ymax = y;
 541                         }
 542
 543                         vi++;
 544                         j++;
 545                 }
 546         }
 547
 548         return ymax;
 549 }
 550
 551
 552 void MapgenV7::generateRidgeTerrain()
 553 {
 554         if (node_max.Y < water_level)
 555                 return;
 556
 557         MapNode n_water(c_water_source);
 558         MapNode n_air(CONTENT_AIR);
 559         u32 index = 0;
 560         float width = 0.2; // TODO: figure out acceptable perlin noise values
 561
 562         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 563         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 564                 u32 vi = vm->m_area.index(node_min.X, y, z);
 565                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 566                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 567
 568                         if (heightmap[j] < water_level - 16)
 569                                 continue;
 570
 571                         float uwatern = noise_ridge_uwater->result[j] * 2;
 572                         if (fabs(uwatern) > width)
 573                                 continue;
 574
 575                         float altitude = y - water_level;
 576                         float height_mod = (altitude + 17) / 2.5;
 577                         float width_mod  = width - fabs(uwatern);
 578                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 579
 580                         if (nridge + width_mod * height_mod < 0.6)
 581                                 continue;
 582
 583                         if (y < ridge_heightmap[j])
 584                                 ridge_heightmap[j] = y - 1;
 585
 586                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 587                 }
 588         }
 589 }
 590
 591
 592 MgStoneType MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 593 {
 594         if (node_max.Y < water_level)
 595                 return STONE;
 596
 597         v3s16 em = vm->m_area.getExtent();
 598         u32 index = 0;
 599         MgStoneType stone_type = STONE;
 600
 601         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 602         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 603                 Biome *biome = NULL;
 604                 s16 dfiller = 0;
 605                 s16 y0_top = 0;
 606                 s16 y0_filler = 0;
 607                 s16 depth_water_top = 0;
 608
 609                 s16 nplaced = 0;
 610                 u32 i = vm->m_area.index(x, node_max.Y, z);
 611
 612                 content_t c_above = vm->m_data[i + em.X].getContent();
 613                 bool have_air = c_above == CONTENT_AIR;
 614
 615                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 616                         content_t c = vm->m_data[i].getContent();
 617
 618                         if (c != CONTENT_IGNORE && c != CONTENT_AIR &&
 619                                         (y == node_max.Y || have_air)) {
 620                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 621                                 dfiller = biome->depth_filler + noise_filler_depth->result[index];
 622                                 y0_top = biome->depth_top;
 623                                 y0_filler = biome->depth_top + dfiller;
 624                                 depth_water_top = biome->depth_water_top;
 625
 626                                 if (biome->c_stone == c_desert_stone)
 627                                         stone_type = DESERT_STONE;
 628                                 else if (biome->c_stone == c_sandstone)
 629                                         stone_type = SANDSTONE;
 630                         }
 631
 632                         if (c == c_stone && have_air) {
 633                                 content_t c_below = vm->m_data[i - em.X].getContent();
 634
 635                                 if (c_below != CONTENT_AIR && c_below != c_water_source) {
 636                                         if (nplaced < y0_top) {
 637                                                 vm->m_data[i] = MapNode(biome->c_top);
 638                                                 nplaced++;
 639                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 640                                                 vm->m_data[i] = MapNode(biome->c_filler);
 641                                                 nplaced++;
 642                                         } else if (c == c_stone) {
 643                                                 have_air = false;
 644                                                 nplaced  = 0;
 645                                                 vm->m_data[i] = MapNode(biome->c_stone);
 646                                         } else {
 647                                                 have_air = false;
 648                                                 nplaced  = 0;
 649                                         }
 650                                 } else if (c == c_stone) {
 651                                         have_air = false;
 652                                         nplaced = 0;
 653                                         vm->m_data[i] = MapNode(biome->c_stone);
 654                                 }
 655                         } else if (c == c_stone) {
 656                                 have_air = false;
 657                                 nplaced = 0;
 658                                 vm->m_data[i] = MapNode(biome->c_stone);
 659                         } else if (c == c_water_source) {
 660                                 have_air = true;
 661                                 nplaced = 0;
 662                                 if (y > water_level - depth_water_top)
 663                                         vm->m_data[i] = MapNode(biome->c_water_top);
 664                                 else
 665                                         vm->m_data[i] = MapNode(biome->c_water);
 666                         } else if (c == CONTENT_AIR) {
 667                                 have_air = true;
 668                                 nplaced = 0;
 669                         }
 670
 671                         vm->m_area.add_y(em, i, -1);
 672                 }
 673         }
 674
 675         return stone_type;
 676 }
 677
 678
 679 void MapgenV7::dustTopNodes()
 680 {
 681         if (node_max.Y < water_level)
 682                 return;
 683
 684         v3s16 em = vm->m_area.getExtent();
 685         u32 index = 0;
 686
 687         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 688         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 689                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 690
 691                 if (biome->c_dust == CONTENT_IGNORE)
 692                         continue;
 693
 694                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 695                 content_t c_full_max = vm->m_data[vi].getContent();
 696                 s16 y_start;
 697
 698                 if (c_full_max == CONTENT_AIR) {
 699                         y_start = full_node_max.Y - 1;
 700                 } else if (c_full_max == CONTENT_IGNORE) {
 701                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 702                         content_t c_max = vm->m_data[vi].getContent();
 703
 704                         if (c_max == CONTENT_AIR)
 705                                 y_start = node_max.Y;
 706                         else
 707                                 continue;
 708                 } else {
 709                         continue;
 710                 }
 711
 712                 vi = vm->m_area.index(x, y_start, z);
 713                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 714                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 715                                 break;
 716
 717                         vm->m_area.add_y(em, vi, -1);
 718                 }
 719
 720                 content_t c = vm->m_data[vi].getContent();
 721                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 722                         vm->m_area.add_y(em, vi, 1);
 723                         vm->m_data[vi] = MapNode(biome->c_dust);
 724                 }
 725         }
 726 }
 727
 728
 729 #if 0
 730 void MapgenV7::addTopNodes()
 731 {
 732         v3s16 em = vm->m_area.getExtent();
 733         s16 ntopnodes;
 734         u32 index = 0;
 735
 736         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 737         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 738                 Biome *biome = bmgr->biomes[biomemap[index]];
 739
 740                 //////////////////// First, add top nodes below the ridge
 741                 s16 y = ridge_heightmap[index];
 742
 743                 // This cutoff is good enough, but not perfect.
 744                 // It will cut off potentially placed top nodes at chunk boundaries
 745                 if (y < node_min.Y)
 746                         continue;
 747                 if (y > node_max.Y) {
 748                         y = node_max.Y; // Let's see if we can still go downward anyway
 749                         u32 vi = vm->m_area.index(x, y, z);
 750                         content_t c = vm->m_data[vi].getContent();
 751                         if (ndef->get(c).walkable)
 752                                 continue;
 753                 }
 754
 755                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 756                 // might not be the actual height, just the lowest part in the chunk
 757                 // where a ridge had been carved
 758                 u32 i = vm->m_area.index(x, y, z);
 759                 for (; y >= node_min.Y; y--) {
 760                         content_t c = vm->m_data[i].getContent();
 761                         if (ndef->get(c).walkable)
 762                                 break;
 763                         vm->m_area.add_y(em, i, -1);
 764                 }
 765
 766                 if (y != node_min.Y - 1 && y >= water_level) {
 767                         ridge_heightmap[index] = y; //update ridgeheight
 768                         ntopnodes = biome->top_depth;
 769                         for (; y <= node_max.Y && ntopnodes; y++) {
 770                                 ntopnodes--;
 771                                 vm->m_data[i] = MapNode(biome->c_top);
 772                                 vm->m_area.add_y(em, i, 1);
 773                         }
 774                         // If dirt, grow grass on it.
 775                         if (y > water_level - 10 &&
 776                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 777                                 vm->m_area.add_y(em, i, -1);
 778                                 if (vm->m_data[i].getContent() == c_dirt)
 779                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 780                         }
 781                 }
 782
 783                 //////////////////// Now, add top nodes on top of the ridge
 784                 y = heightmap[index];
 785                 if (y > node_max.Y) {
 786                         y = node_max.Y; // Let's see if we can still go downward anyway
 787                         u32 vi = vm->m_area.index(x, y, z);
 788                         content_t c = vm->m_data[vi].getContent();
 789                         if (ndef->get(c).walkable)
 790                                 continue;
 791                 }
 792
 793                 i = vm->m_area.index(x, y, z);
 794                 for (; y >= node_min.Y; y--) {
 795                         content_t c = vm->m_data[i].getContent();
 796                         if (ndef->get(c).walkable)
 797                                 break;
 798                         vm->m_area.add_y(em, i, -1);
 799                 }
 800
 801                 if (y != node_min.Y - 1) {
 802                         ntopnodes = biome->top_depth;
 803                         // Let's see if we've already added it...
 804                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 805                                 continue;
 806
 807                         for (; y <= node_max.Y && ntopnodes; y++) {
 808                                 ntopnodes--;
 809                                 vm->m_data[i] = MapNode(biome->c_top);
 810                                 vm->m_area.add_y(em, i, 1);
 811                         }
 812                         // If dirt, grow grass on it.
 813                         if (y > water_level - 10 &&
 814                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 815                                 vm->m_area.add_y(em, i, -1);
 816                                 if (vm->m_data[i].getContent() == c_dirt)
 817                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 818                         }
 819                 }
 820         }
 821 }
 822 #endif
 823
 824
 825 void MapgenV7::generateCaves(int max_stone_y)
 826 {
 827         if (max_stone_y >= node_min.Y) {
 828                 u32 index   = 0;
 829                 u32 index2d = 0;
 830
 831                 for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 832                         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 833                                 u32 i = vm->m_area.index(node_min.X, y, z);
 834                                 for (s16 x = node_min.X; x <= node_max.X;
 835                                                 x++, i++, index++, index2d++) {
 836                                         float d1 = contour(noise_cave1->result[index]);
 837                                         float d2 = contour(noise_cave2->result[index]);
 838                                         if (d1 * d2 > 0.3) {
 839                                                 Biome *biome = (Biome *)bmgr->
 840                                                                         getRaw(biomemap[index2d]);
 841                                                 content_t c = vm->m_data[i].getContent();
 842                                                 if (!ndef->get(c).is_ground_content ||
 843                                                                 c == CONTENT_AIR ||
 844                                                                 (y <= water_level &&
 845                                                                 c != biome->c_stone &&
 846                                                                 c != c_stone))
 847                                                         continue;
 848
 849                                                 vm->m_data[i] = MapNode(CONTENT_AIR);
 850                                         }
 851                                 }
 852                                 index2d -= ystride;
 853                         }
 854                         index2d += ystride;
 855                 }
 856         }
 857
 858         PseudoRandom ps(blockseed + 21343);
 859         u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
 860         for (u32 i = 0; i < bruises_count; i++) {
 861                 CaveV7 cave(this, &ps);
 862                 cave.makeCave(node_min, node_max, max_stone_y);
 863         }
 864 }
 865