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_dirt            = ndef->getId("mapgen_dirt");
  93         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  94         c_sand            = ndef->getId("mapgen_sand");
  95         c_water_source    = ndef->getId("mapgen_water_source");
  96         c_lava_source     = ndef->getId("mapgen_lava_source");
  97         c_ice             = ndef->getId("default:ice");
  98         c_cobble          = ndef->getId("mapgen_cobble");
  99         c_desert_stone    = ndef->getId("mapgen_desert_stone");
 100         c_mossycobble     = ndef->getId("mapgen_mossycobble");
 101         c_sandbrick       = ndef->getId("mapgen_sandstonebrick");
 102         c_stair_cobble    = ndef->getId("mapgen_stair_cobble");
 103         c_stair_sandstone = ndef->getId("mapgen_stair_sandstone");
 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_sandbrick == CONTENT_IGNORE)
 109                 c_sandbrick = c_desert_stone;
 110         if (c_stair_cobble == CONTENT_IGNORE)
 111                 c_stair_cobble = c_cobble;
 112         if (c_stair_sandstone == CONTENT_IGNORE)
 113                 c_stair_sandstone = c_sandbrick;
 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         bool desert_stone = 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 (desert_stone) {
 277                         dp.c_cobble  = c_sandbrick;
 278                         dp.c_moss    = c_sandbrick; // should make this 'cracked sandstone' later
 279                         dp.c_stair   = c_stair_sandstone;
 280
 281                         dp.diagonal_dirs = true;
 282                         dp.mossratio  = 0.0;
 283                         dp.holesize   = v3s16(2, 3, 2);
 284                         dp.roomsize   = v3s16(2, 5, 2);
 285                         dp.notifytype = GENNOTIFY_TEMPLE;
 286                 } else {
 287                         dp.c_cobble  = c_cobble;
 288                         dp.c_moss    = c_mossycobble;
 289                         dp.c_stair   = c_stair_cobble;
 290
 291                         dp.diagonal_dirs = false;
 292                         dp.mossratio  = 3.0;
 293                         dp.holesize   = v3s16(1, 2, 1);
 294                         dp.roomsize   = v3s16(0, 0, 0);
 295                         dp.notifytype = GENNOTIFY_DUNGEON;
 296                 }
 297
 298                 DungeonGen dgen(this, &dp);
 299                 dgen.generate(blockseed, full_node_min, full_node_max);
 300         }
 301
 302         // Generate the registered decorations
 303         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 304
 305         // Generate the registered ores
 306         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 307
 308         // Sprinkle some dust on top after everything else was generated
 309         dustTopNodes();
 310
 311         //printf("makeChunk: %dms\n", t.stop());
 312
 313         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 314
 315         if (flags & MG_LIGHT)
 316                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 317                         full_node_min, full_node_max);
 318
 319         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 320         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 321
 322         this->generating = false;
 323 }
 324
 325
 326 void MapgenV7::calculateNoise()
 327 {
 328         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 329         int x = node_min.X;
 330         int y = node_min.Y - 1;
 331         int z = node_min.Z;
 332
 333         noise_terrain_persist->perlinMap2D(x, z);
 334         float *persistmap = noise_terrain_persist->result;
 335
 336         noise_terrain_base->perlinMap2D(x, z, persistmap);
 337         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 338         noise_height_select->perlinMap2D(x, z);
 339
 340         if (flags & MG_CAVES) {
 341                 noise_cave1->perlinMap3D(x, y, z);
 342                 noise_cave2->perlinMap3D(x, y, z);
 343         }
 344
 345         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 346                 noise_ridge->perlinMap3D(x, y, z);
 347                 noise_ridge_uwater->perlinMap2D(x, z);
 348         }
 349
 350         if ((spflags & MGV7_MOUNTAINS) && node_max.Y >= 0) {
 351                 noise_mountain->perlinMap3D(x, y, z);
 352                 noise_mount_height->perlinMap2D(x, z);
 353         }
 354
 355         if (node_max.Y >= water_level) {
 356                 noise_filler_depth->perlinMap2D(x, z);
 357                 noise_heat->perlinMap2D(x, z);
 358                 noise_humidity->perlinMap2D(x, z);
 359         }
 360         //printf("calculateNoise: %dus\n", t.stop());
 361 }
 362
 363
 364 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 365 {
 366         float heat      = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed);
 367         float humidity  = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed);
 368         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 369
 370         return bmgr->getBiome(heat, humidity, groundlevel);
 371 }
 372
 373 //needs to be updated
 374 float MapgenV7::baseTerrainLevelAtPoint(int x, int z)
 375 {
 376         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 377         hselect = rangelim(hselect, 0.0, 1.0);
 378
 379         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 380
 381         noise_terrain_base->np.persist = persist;
 382         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 383
 384         noise_terrain_alt->np.persist = persist;
 385         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 386
 387         if (height_alt > height_base)
 388                 return height_alt;
 389
 390         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 391 }
 392
 393
 394 float MapgenV7::baseTerrainLevelFromMap(int index)
 395 {
 396         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 397         float height_base = noise_terrain_base->result[index];
 398         float height_alt  = noise_terrain_alt->result[index];
 399
 400         if (height_alt > height_base)
 401                 return height_alt;
 402
 403         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 404 }
 405
 406
 407 bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z)
 408 {
 409         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 410         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 411         return mnt_n * mnt_h_n >= (float)y;
 412 }
 413
 414
 415 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y)
 416 {
 417         float mounthn = noise_mount_height->result[idx_xz];
 418         float mountn = noise_mountain->result[idx_xyz];
 419         return mountn * mounthn >= (float)y;
 420 }
 421
 422
 423 #if 0
 424 void MapgenV7::carveRivers() {
 425         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 426         MapNode n_stone(c_stone);
 427         u32 index = 0;
 428
 429         int river_depth = 4;
 430
 431         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 432         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 433                 float terrain_mod  = noise_terrain_mod->result[index];
 434                 NoiseParams *np = noise_terrain_river->np;
 435                 np.persist = noise_terrain_persist->result[index];
 436                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 437                 float height = terrain_river * (1 - abs(terrain_mod)) *
 438                                                 noise_terrain_river->np.scale;
 439                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 440
 441                 s16 y = heightmap[index];
 442                 if (height < 1.0 && y > river_depth &&
 443                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 444
 445                         for (s16 ry = y; ry != y - river_depth; ry--) {
 446                                 u32 vi = vm->m_area.index(x, ry, z);
 447                                 vm->m_data[vi] = n_air;
 448                         }
 449
 450                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 451                         vm->m_data[vi] = n_water_source;
 452                 }
 453         }
 454 }
 455 #endif
 456
 457
 458 int MapgenV7::generateTerrain()
 459 {
 460         int ymax = generateBaseTerrain();
 461
 462         if (spflags & MGV7_MOUNTAINS)
 463                 ymax = generateMountainTerrain(ymax);
 464
 465         if (spflags & MGV7_RIDGES)
 466                 generateRidgeTerrain();
 467
 468         return ymax;
 469 }
 470
 471
 472 int MapgenV7::generateBaseTerrain()
 473 {
 474         MapNode n_air(CONTENT_AIR);
 475         MapNode n_stone(c_stone);
 476         MapNode n_water(c_water_source);
 477
 478         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 479         v3s16 em = vm->m_area.getExtent();
 480         u32 index = 0;
 481
 482         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 483         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 484                 float surface_height = baseTerrainLevelFromMap(index);
 485                 s16 surface_y = (s16)surface_height;
 486
 487                 heightmap[index]       = surface_y;
 488                 ridge_heightmap[index] = surface_y;
 489
 490                 if (surface_y > stone_surface_max_y)
 491                         stone_surface_max_y = surface_y;
 492
 493                 u32 i = vm->m_area.index(x, node_min.Y - 1, z);
 494                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 495                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 496                                 if (y <= surface_y)
 497                                         vm->m_data[i] = n_stone;
 498                                 else if (y <= water_level)
 499                                         vm->m_data[i] = n_water;
 500                                 else
 501                                         vm->m_data[i] = n_air;
 502                         }
 503                         vm->m_area.add_y(em, i, 1);
 504                 }
 505         }
 506
 507         return stone_surface_max_y;
 508 }
 509
 510
 511 int MapgenV7::generateMountainTerrain(int ymax)
 512 {
 513         if (node_max.Y < 0)
 514                 return ymax;
 515
 516         MapNode n_stone(c_stone);
 517         u32 j = 0;
 518
 519         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 520         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 521                 u32 vi = vm->m_area.index(node_min.X, y, z);
 522                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 523                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 524                         content_t c = vm->m_data[vi].getContent();
 525
 526                         if (getMountainTerrainFromMap(j, index, y)
 527                                         && (c == CONTENT_AIR || c == c_water_source)) {
 528                                 vm->m_data[vi] = n_stone;
 529                                 if (y > ymax)
 530                                         ymax = y;
 531                         }
 532
 533                         vi++;
 534                         j++;
 535                 }
 536         }
 537
 538         return ymax;
 539 }
 540
 541
 542 void MapgenV7::generateRidgeTerrain()
 543 {
 544         if (node_max.Y < water_level)
 545                 return;
 546
 547         MapNode n_water(c_water_source);
 548         MapNode n_air(CONTENT_AIR);
 549         u32 index = 0;
 550         float width = 0.2; // TODO: figure out acceptable perlin noise values
 551
 552         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 553         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 554                 u32 vi = vm->m_area.index(node_min.X, y, z);
 555                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 556                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 557
 558                         if (heightmap[j] < water_level - 16)
 559                                 continue;
 560
 561                         float uwatern = noise_ridge_uwater->result[j] * 2;
 562                         if (fabs(uwatern) > width)
 563                                 continue;
 564
 565                         float altitude = y - water_level;
 566                         float height_mod = (altitude + 17) / 2.5;
 567                         float width_mod  = width - fabs(uwatern);
 568                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 569
 570                         if (nridge + width_mod * height_mod < 0.6)
 571                                 continue;
 572
 573                         if (y < ridge_heightmap[j])
 574                                 ridge_heightmap[j] = y - 1;
 575
 576                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 577                 }
 578         }
 579 }
 580
 581
 582 bool MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 583 {
 584         if (node_max.Y < water_level)
 585                 return false;
 586
 587         v3s16 em = vm->m_area.getExtent();
 588         u32 index = 0;
 589         bool desert_stone = false;
 590
 591         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 592         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 593                 Biome *biome = NULL;
 594                 s16 dfiller = 0;
 595                 s16 y0_top = 0;
 596                 s16 y0_filler = 0;
 597                 s16 depth_water_top = 0;
 598
 599                 s16 nplaced = 0;
 600                 u32 i = vm->m_area.index(x, node_max.Y, z);
 601
 602                 content_t c_above = vm->m_data[i + em.X].getContent();
 603                 bool have_air = c_above == CONTENT_AIR;
 604
 605                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 606                         content_t c = vm->m_data[i].getContent();
 607
 608                         if (c != CONTENT_IGNORE && c != CONTENT_AIR &&
 609                                         (y == node_max.Y || have_air)) {
 610                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 611                                 dfiller = biome->depth_filler + noise_filler_depth->result[index];
 612                                 y0_top = biome->depth_top;
 613                                 y0_filler = biome->depth_top + dfiller;
 614                                 depth_water_top = biome->depth_water_top;
 615
 616                                 if (biome->c_stone == c_desert_stone)
 617                                         desert_stone = true;
 618                         }
 619
 620                         if (c == c_stone && have_air) {
 621                                 content_t c_below = vm->m_data[i - em.X].getContent();
 622
 623                                 if (c_below != CONTENT_AIR) {
 624                                         if (nplaced < y0_top) {
 625                                                 vm->m_data[i] = MapNode(biome->c_top);
 626                                                 nplaced++;
 627                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 628                                                 vm->m_data[i] = MapNode(biome->c_filler);
 629                                                 nplaced++;
 630                                         } else if (c == c_stone) {
 631                                                 have_air = false;
 632                                                 nplaced  = 0;
 633                                                 vm->m_data[i] = MapNode(biome->c_stone);
 634                                         } else {
 635                                                 have_air = false;
 636                                                 nplaced  = 0;
 637                                         }
 638                                 } else if (c == c_stone) {
 639                                         have_air = false;
 640                                         nplaced = 0;
 641                                         vm->m_data[i] = MapNode(biome->c_stone);
 642                                 }
 643                         } else if (c == c_stone) {
 644                                 have_air = false;
 645                                 nplaced = 0;
 646                                 vm->m_data[i] = MapNode(biome->c_stone);
 647                         } else if (c == c_water_source) {
 648                                 have_air = true;
 649                                 nplaced = 0;
 650                                 if (y > water_level - depth_water_top)
 651                                         vm->m_data[i] = MapNode(biome->c_water_top);
 652                                 else
 653                                         vm->m_data[i] = MapNode(biome->c_water);
 654                         } else if (c == CONTENT_AIR) {
 655                                 have_air = true;
 656                                 nplaced = 0;
 657                         }
 658
 659                         vm->m_area.add_y(em, i, -1);
 660                 }
 661         }
 662
 663         return desert_stone;
 664 }
 665
 666
 667 void MapgenV7::dustTopNodes()
 668 {
 669         if (node_max.Y < water_level)
 670                 return;
 671
 672         v3s16 em = vm->m_area.getExtent();
 673         u32 index = 0;
 674
 675         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 676         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 677                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 678
 679                 if (biome->c_dust == CONTENT_IGNORE)
 680                         continue;
 681
 682                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 683                 content_t c_full_max = vm->m_data[vi].getContent();
 684                 s16 y_start;
 685
 686                 if (c_full_max == CONTENT_AIR) {
 687                         y_start = full_node_max.Y - 1;
 688                 } else if (c_full_max == CONTENT_IGNORE) {
 689                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 690                         content_t c_max = vm->m_data[vi].getContent();
 691
 692                         if (c_max == CONTENT_AIR)
 693                                 y_start = node_max.Y;
 694                         else
 695                                 continue;
 696                 } else {
 697                         continue;
 698                 }
 699
 700                 vi = vm->m_area.index(x, y_start, z);
 701                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 702                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 703                                 break;
 704
 705                         vm->m_area.add_y(em, vi, -1);
 706                 }
 707
 708                 content_t c = vm->m_data[vi].getContent();
 709                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 710                         vm->m_area.add_y(em, vi, 1);
 711                         vm->m_data[vi] = MapNode(biome->c_dust);
 712                 }
 713         }
 714 }
 715
 716
 717 #if 0
 718 void MapgenV7::addTopNodes()
 719 {
 720         v3s16 em = vm->m_area.getExtent();
 721         s16 ntopnodes;
 722         u32 index = 0;
 723
 724         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 725         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 726                 Biome *biome = bmgr->biomes[biomemap[index]];
 727
 728                 //////////////////// First, add top nodes below the ridge
 729                 s16 y = ridge_heightmap[index];
 730
 731                 // This cutoff is good enough, but not perfect.
 732                 // It will cut off potentially placed top nodes at chunk boundaries
 733                 if (y < node_min.Y)
 734                         continue;
 735                 if (y > node_max.Y) {
 736                         y = node_max.Y; // Let's see if we can still go downward anyway
 737                         u32 vi = vm->m_area.index(x, y, z);
 738                         content_t c = vm->m_data[vi].getContent();
 739                         if (ndef->get(c).walkable)
 740                                 continue;
 741                 }
 742
 743                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 744                 // might not be the actual height, just the lowest part in the chunk
 745                 // where a ridge had been carved
 746                 u32 i = vm->m_area.index(x, y, z);
 747                 for (; y >= node_min.Y; y--) {
 748                         content_t c = vm->m_data[i].getContent();
 749                         if (ndef->get(c).walkable)
 750                                 break;
 751                         vm->m_area.add_y(em, i, -1);
 752                 }
 753
 754                 if (y != node_min.Y - 1 && y >= water_level) {
 755                         ridge_heightmap[index] = y; //update ridgeheight
 756                         ntopnodes = biome->top_depth;
 757                         for (; y <= node_max.Y && ntopnodes; y++) {
 758                                 ntopnodes--;
 759                                 vm->m_data[i] = MapNode(biome->c_top);
 760                                 vm->m_area.add_y(em, i, 1);
 761                         }
 762                         // If dirt, grow grass on it.
 763                         if (y > water_level - 10 &&
 764                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 765                                 vm->m_area.add_y(em, i, -1);
 766                                 if (vm->m_data[i].getContent() == c_dirt)
 767                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 768                         }
 769                 }
 770
 771                 //////////////////// Now, add top nodes on top of the ridge
 772                 y = heightmap[index];
 773                 if (y > node_max.Y) {
 774                         y = node_max.Y; // Let's see if we can still go downward anyway
 775                         u32 vi = vm->m_area.index(x, y, z);
 776                         content_t c = vm->m_data[vi].getContent();
 777                         if (ndef->get(c).walkable)
 778                                 continue;
 779                 }
 780
 781                 i = vm->m_area.index(x, y, z);
 782                 for (; y >= node_min.Y; y--) {
 783                         content_t c = vm->m_data[i].getContent();
 784                         if (ndef->get(c).walkable)
 785                                 break;
 786                         vm->m_area.add_y(em, i, -1);
 787                 }
 788
 789                 if (y != node_min.Y - 1) {
 790                         ntopnodes = biome->top_depth;
 791                         // Let's see if we've already added it...
 792                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 793                                 continue;
 794
 795                         for (; y <= node_max.Y && ntopnodes; y++) {
 796                                 ntopnodes--;
 797                                 vm->m_data[i] = MapNode(biome->c_top);
 798                                 vm->m_area.add_y(em, i, 1);
 799                         }
 800                         // If dirt, grow grass on it.
 801                         if (y > water_level - 10 &&
 802                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 803                                 vm->m_area.add_y(em, i, -1);
 804                                 if (vm->m_data[i].getContent() == c_dirt)
 805                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 806                         }
 807                 }
 808         }
 809 }
 810 #endif
 811
 812
 813 void MapgenV7::generateCaves(int max_stone_y)
 814 {
 815         if (max_stone_y >= node_min.Y) {
 816                 u32 index   = 0;
 817                 u32 index2d = 0;
 818
 819                 for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 820                         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 821                                 u32 i = vm->m_area.index(node_min.X, y, z);
 822                                 for (s16 x = node_min.X; x <= node_max.X;
 823                                                 x++, i++, index++, index2d++) {
 824                                         float d1 = contour(noise_cave1->result[index]);
 825                                         float d2 = contour(noise_cave2->result[index]);
 826                                         if (d1 * d2 > 0.3) {
 827                                                 Biome *biome = (Biome *)bmgr->
 828                                                                         getRaw(biomemap[index2d]);
 829                                                 content_t c = vm->m_data[i].getContent();
 830                                                 if (!ndef->get(c).is_ground_content ||
 831                                                                 c == CONTENT_AIR ||
 832                                                                 (y <= water_level &&
 833                                                                 c != biome->c_stone &&
 834                                                                 c != c_stone))
 835                                                         continue;
 836
 837                                                 vm->m_data[i] = MapNode(CONTENT_AIR);
 838                                         }
 839                                 }
 840                                 index2d -= ystride;
 841                         }
 842                         index2d += ystride;
 843                 }
 844         }
 845
 846         PseudoRandom ps(blockseed + 21343);
 847         u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
 848         for (u32 i = 0; i < bruises_count; i++) {
 849                 CaveV7 cave(this, &ps);
 850                 cave.makeCave(node_min, node_max, max_stone_y);
 851         }
 852 }
 853