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 "settings.h" // For g_settings
  31 #include "emerge.h"
  32 #include "dungeongen.h"
  33 #include "cavegen.h"
  34 #include "treegen.h"
  35 #include "mg_biome.h"
  36 #include "mg_ore.h"
  37 #include "mg_decoration.h"
  38 #include "mapgen_v7.h"
  39
  40
  41 FlagDesc flagdesc_mapgen_v7[] = {
  42         {"mountains", MGV7_MOUNTAINS},
  43         {"ridges",    MGV7_RIDGES},
  44         {NULL,        0}
  45 };
  46
  47 ///////////////////////////////////////////////////////////////////////////////
  48
  49
  50 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  51         : Mapgen(mapgenid, params, emerge)
  52 {
  53         this->m_emerge = emerge;
  54         this->bmgr     = emerge->biomemgr;
  55
  56         //// amount of elements to skip for the next index
  57         //// for noise/height/biome maps (not vmanip)
  58         this->ystride = csize.X;
  59         this->zstride = csize.X * (csize.Y + 2);
  60
  61         this->biomemap        = new u8[csize.X * csize.Z];
  62         this->heightmap       = new s16[csize.X * csize.Z];
  63         this->heatmap         = NULL;
  64         this->humidmap        = NULL;
  65         this->ridge_heightmap = new s16[csize.X * csize.Z];
  66
  67         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  68         this->spflags = sp->spflags;
  69
  70         //// Terrain noise
  71         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  72         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  73         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  74         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  75         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  76         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  77         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  78
  79         //// 3d terrain noise
  80         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  81         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  82         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y + 2, csize.Z);
  83         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y + 2, csize.Z);
  84
  85         //// Biome noise
  86         noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
  87         noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
  88         noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
  89         noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
  90
  91         //// Resolve nodes to be used
  92         INodeDefManager *ndef = emerge->ndef;
  93
  94         c_stone                = ndef->getId("mapgen_stone");
  95         c_water_source         = ndef->getId("mapgen_water_source");
  96         c_lava_source          = ndef->getId("mapgen_lava_source");
  97         c_desert_stone         = ndef->getId("mapgen_desert_stone");
  98         c_ice                  = ndef->getId("mapgen_ice");
  99         c_sandstone            = ndef->getId("mapgen_sandstone");
 100
 101         c_cobble               = ndef->getId("mapgen_cobble");
 102         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 103         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 104         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 105         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 106
 107         if (c_ice == CONTENT_IGNORE)
 108                 c_ice = CONTENT_AIR;
 109         if (c_mossycobble == CONTENT_IGNORE)
 110                 c_mossycobble = c_cobble;
 111         if (c_stair_cobble == CONTENT_IGNORE)
 112                 c_stair_cobble = c_cobble;
 113         if (c_sandstonebrick == CONTENT_IGNORE)
 114                 c_sandstonebrick = c_sandstone;
 115         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 116                 c_stair_sandstonebrick = c_sandstone;
 117 }
 118
 119
 120 MapgenV7::~MapgenV7()
 121 {
 122         delete noise_terrain_base;
 123         delete noise_terrain_persist;
 124         delete noise_height_select;
 125         delete noise_terrain_alt;
 126         delete noise_filler_depth;
 127         delete noise_mount_height;
 128         delete noise_ridge_uwater;
 129         delete noise_mountain;
 130         delete noise_ridge;
 131         delete noise_cave1;
 132         delete noise_cave2;
 133
 134         delete noise_heat;
 135         delete noise_humidity;
 136         delete noise_heat_blend;
 137         delete noise_humidity_blend;
 138
 139         delete[] ridge_heightmap;
 140         delete[] heightmap;
 141         delete[] biomemap;
 142 }
 143
 144
 145 MapgenV7Params::MapgenV7Params()
 146 {
 147         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 148
 149         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 150         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 151         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 152         np_height_select   = NoiseParams(-12,  24,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 153         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 154         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 155         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 156         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 157         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 158         np_cave1           = NoiseParams(0,    12,  v3f(100,  100,  100),  52534, 4, 0.5,  2.0);
 159         np_cave2           = NoiseParams(0,    12,  v3f(100,  100,  100),  10325, 4, 0.5,  2.0);
 160 }
 161
 162
 163 void MapgenV7Params::readParams(const Settings *settings)
 164 {
 165         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 166
 167         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 168         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 169         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 170         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 171         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 172         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 173         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 174         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 175         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 176         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 177         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 178 }
 179
 180
 181 void MapgenV7Params::writeParams(Settings *settings) const
 182 {
 183         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
 184
 185         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 186         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 187         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 188         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 189         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 190         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 191         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 192         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 193         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 194         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 195         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 196 }
 197
 198
 199 ///////////////////////////////////////
 200
 201
 202 int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 203 {
 204         // Base terrain calculation
 205         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 206
 207         // Ridge/river terrain calculation
 208         float width = 0.2;
 209         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 210         // actually computing the depth of the ridge is much more expensive;
 211         // if inside a river, simply guess
 212         if (fabs(uwatern) <= width)
 213                 return water_level - 10;
 214
 215         // Mountain terrain calculation
 216         int iters = 128; // don't even bother iterating more than 128 times..
 217         while (iters--) {
 218                 //current point would have been air
 219                 if (!getMountainTerrainAtPoint(p.X, y, p.Y))
 220                         return y;
 221
 222                 y++;
 223         }
 224
 225         return y;
 226 }
 227
 228
 229 void MapgenV7::makeChunk(BlockMakeData *data)
 230 {
 231         // Pre-conditions
 232         assert(data->vmanip);
 233         assert(data->nodedef);
 234         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 235                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 236                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 237         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 238                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 239                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 240
 241         this->generating = true;
 242         this->vm   = data->vmanip;
 243         this->ndef = data->nodedef;
 244         //TimeTaker t("makeChunk");
 245
 246         v3s16 blockpos_min = data->blockpos_min;
 247         v3s16 blockpos_max = data->blockpos_max;
 248         node_min = blockpos_min * MAP_BLOCKSIZE;
 249         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 250         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 251         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 252
 253         blockseed = getBlockSeed2(full_node_min, seed);
 254
 255         // Make some noise
 256         calculateNoise();
 257
 258         // Generate base terrain, mountains, and ridges with initial heightmaps
 259         s16 stone_surface_max_y = generateTerrain();
 260
 261         // Create heightmap
 262         updateHeightmap(node_min, node_max);
 263
 264         // Create biomemap at heightmap surface
 265         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 266                 noise_humidity->result, heightmap, biomemap);
 267
 268         // Actually place the biome-specific nodes
 269         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 270
 271         if (flags & MG_CAVES)
 272                 generateCaves(stone_surface_max_y);
 273
 274         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 275                 DungeonParams dp;
 276
 277                 dp.np_rarity  = nparams_dungeon_rarity;
 278                 dp.np_density = nparams_dungeon_density;
 279                 dp.np_wetness = nparams_dungeon_wetness;
 280                 dp.c_water    = c_water_source;
 281                 if (stone_type == STONE) {
 282                         dp.c_cobble = c_cobble;
 283                         dp.c_moss   = c_mossycobble;
 284                         dp.c_stair  = c_stair_cobble;
 285
 286                         dp.diagonal_dirs = false;
 287                         dp.mossratio     = 3.0;
 288                         dp.holesize      = v3s16(1, 2, 1);
 289                         dp.roomsize      = v3s16(0, 0, 0);
 290                         dp.notifytype    = GENNOTIFY_DUNGEON;
 291                 } else if (stone_type == DESERT_STONE) {
 292                         dp.c_cobble = c_desert_stone;
 293                         dp.c_moss   = c_desert_stone;
 294                         dp.c_stair  = c_desert_stone;
 295
 296                         dp.diagonal_dirs = true;
 297                         dp.mossratio     = 0.0;
 298                         dp.holesize      = v3s16(2, 3, 2);
 299                         dp.roomsize      = v3s16(2, 5, 2);
 300                         dp.notifytype    = GENNOTIFY_TEMPLE;
 301                 } else if (stone_type == SANDSTONE) {
 302                         dp.c_cobble = c_sandstonebrick;
 303                         dp.c_moss   = c_sandstonebrick;
 304                         dp.c_stair  = c_sandstonebrick;
 305
 306                         dp.diagonal_dirs = false;
 307                         dp.mossratio     = 0.0;
 308                         dp.holesize      = v3s16(2, 2, 2);
 309                         dp.roomsize      = v3s16(2, 0, 2);
 310                         dp.notifytype    = GENNOTIFY_DUNGEON;
 311                 }
 312
 313                 DungeonGen dgen(this, &dp);
 314                 dgen.generate(blockseed, full_node_min, full_node_max);
 315         }
 316
 317         // Generate the registered decorations
 318         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 319
 320         // Generate the registered ores
 321         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 322
 323         // Sprinkle some dust on top after everything else was generated
 324         dustTopNodes();
 325
 326         //printf("makeChunk: %dms\n", t.stop());
 327
 328         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 329
 330         if (flags & MG_LIGHT)
 331                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 332                         full_node_min, full_node_max);
 333
 334         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 335         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 336
 337         this->generating = false;
 338 }
 339
 340
 341 void MapgenV7::calculateNoise()
 342 {
 343         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 344         int x = node_min.X;
 345         int y = node_min.Y - 1;
 346         int z = node_min.Z;
 347
 348         noise_terrain_persist->perlinMap2D(x, z);
 349         float *persistmap = noise_terrain_persist->result;
 350
 351         noise_terrain_base->perlinMap2D(x, z, persistmap);
 352         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 353         noise_height_select->perlinMap2D(x, z);
 354
 355         if (flags & MG_CAVES) {
 356                 noise_cave1->perlinMap3D(x, y, z);
 357                 noise_cave2->perlinMap3D(x, y, z);
 358         }
 359
 360         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 361                 noise_ridge->perlinMap3D(x, y, z);
 362                 noise_ridge_uwater->perlinMap2D(x, z);
 363         }
 364
 365         // Mountain noises are calculated in generateMountainTerrain()
 366
 367         noise_filler_depth->perlinMap2D(x, z);
 368         noise_heat->perlinMap2D(x, z);
 369         noise_humidity->perlinMap2D(x, z);
 370         noise_heat_blend->perlinMap2D(x, z);
 371         noise_humidity_blend->perlinMap2D(x, z);
 372
 373         for (s32 i = 0; i < csize.X * csize.Z; i++) {
 374                 noise_heat->result[i] += noise_heat_blend->result[i];
 375                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 376         }
 377
 378         heatmap = noise_heat->result;
 379         humidmap = noise_humidity->result;
 380         //printf("calculateNoise: %dus\n", t.stop());
 381 }
 382
 383
 384 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 385 {
 386         float heat = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed) +
 387                 NoisePerlin2D(&noise_heat_blend->np, p.X, p.Z, seed);
 388         float humidity = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed) +
 389                 NoisePerlin2D(&noise_humidity_blend->np, p.X, p.Z, seed);
 390         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 391
 392         return bmgr->getBiome(heat, humidity, groundlevel);
 393 }
 394
 395 //needs to be updated
 396 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 397 {
 398         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 399         hselect = rangelim(hselect, 0.0, 1.0);
 400
 401         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 402
 403         noise_terrain_base->np.persist = persist;
 404         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 405
 406         noise_terrain_alt->np.persist = persist;
 407         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 408
 409         if (height_alt > height_base)
 410                 return height_alt;
 411
 412         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 413 }
 414
 415
 416 float MapgenV7::baseTerrainLevelFromMap(int index)
 417 {
 418         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 419         float height_base = noise_terrain_base->result[index];
 420         float height_alt  = noise_terrain_alt->result[index];
 421
 422         if (height_alt > height_base)
 423                 return height_alt;
 424
 425         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 426 }
 427
 428
 429 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 430 {
 431         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 432         float density_gradient = -((float)y / mnt_h_n);
 433         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 434
 435         return mnt_n + density_gradient >= 0.0;
 436 }
 437
 438
 439 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 440 {
 441         float mounthn = noise_mount_height->result[idx_xz];
 442         float density_gradient = -((float)y / mounthn);
 443         float mountn = noise_mountain->result[idx_xyz];
 444
 445         return mountn + density_gradient >= 0.0;
 446 }
 447
 448
 449 #if 0
 450 void MapgenV7::carveRivers() {
 451         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 452         MapNode n_stone(c_stone);
 453         u32 index = 0;
 454
 455         int river_depth = 4;
 456
 457         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 458         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 459                 float terrain_mod  = noise_terrain_mod->result[index];
 460                 NoiseParams *np = noise_terrain_river->np;
 461                 np.persist = noise_terrain_persist->result[index];
 462                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 463                 float height = terrain_river * (1 - abs(terrain_mod)) *
 464                                                 noise_terrain_river->np.scale;
 465                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 466
 467                 s16 y = heightmap[index];
 468                 if (height < 1.0 && y > river_depth &&
 469                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 470
 471                         for (s16 ry = y; ry != y - river_depth; ry--) {
 472                                 u32 vi = vm->m_area.index(x, ry, z);
 473                                 vm->m_data[vi] = n_air;
 474                         }
 475
 476                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 477                         vm->m_data[vi] = n_water_source;
 478                 }
 479         }
 480 }
 481 #endif
 482
 483
 484 int MapgenV7::generateTerrain()
 485 {
 486         s16 stone_surface_min_y;
 487         s16 stone_surface_max_y;
 488
 489         generateBaseTerrain(&stone_surface_min_y, &stone_surface_max_y);
 490
 491         if ((spflags & MGV7_MOUNTAINS) && stone_surface_min_y < node_max.Y)
 492                 stone_surface_max_y = generateMountainTerrain(stone_surface_max_y);
 493
 494         if (spflags & MGV7_RIDGES)
 495                 generateRidgeTerrain();
 496
 497         return stone_surface_max_y;
 498 }
 499
 500
 501 void MapgenV7::generateBaseTerrain(s16 *stone_surface_min_y, s16 *stone_surface_max_y)
 502 {
 503         MapNode n_air(CONTENT_AIR);
 504         MapNode n_stone(c_stone);
 505         MapNode n_water(c_water_source);
 506
 507         v3s16 em = vm->m_area.getExtent();
 508         s16 surface_min_y = MAX_MAP_GENERATION_LIMIT;
 509         s16 surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 510         u32 index = 0;
 511
 512         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 513         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 514                 float surface_height = baseTerrainLevelFromMap(index);
 515                 s16 surface_y = (s16)surface_height;
 516
 517                 heightmap[index]       = surface_y;
 518                 ridge_heightmap[index] = surface_y;
 519
 520                 if (surface_y < surface_min_y)
 521                         surface_min_y = surface_y;
 522
 523                 if (surface_y > surface_max_y)
 524                         surface_max_y = surface_y;
 525
 526                 u32 i = vm->m_area.index(x, node_min.Y - 1, z);
 527                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 528                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 529                                 if (y <= surface_y)
 530                                         vm->m_data[i] = n_stone;
 531                                 else if (y <= water_level)
 532                                         vm->m_data[i] = n_water;
 533                                 else
 534                                         vm->m_data[i] = n_air;
 535                         }
 536                         vm->m_area.add_y(em, i, 1);
 537                 }
 538         }
 539
 540         *stone_surface_min_y = surface_min_y;
 541         *stone_surface_max_y = surface_max_y;
 542 }
 543
 544
 545 int MapgenV7::generateMountainTerrain(s16 ymax)
 546 {
 547         noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 548         noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 549
 550         MapNode n_stone(c_stone);
 551         u32 j = 0;
 552
 553         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 554         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 555                 u32 vi = vm->m_area.index(node_min.X, y, z);
 556                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 557                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 558                         content_t c = vm->m_data[vi].getContent();
 559
 560                         if (getMountainTerrainFromMap(j, index, y)
 561                                         && (c == CONTENT_AIR || c == c_water_source)) {
 562                                 vm->m_data[vi] = n_stone;
 563                                 if (y > ymax)
 564                                         ymax = y;
 565                         }
 566
 567                         vi++;
 568                         j++;
 569                 }
 570         }
 571
 572         return ymax;
 573 }
 574
 575
 576 void MapgenV7::generateRidgeTerrain()
 577 {
 578         if (node_max.Y < water_level)
 579                 return;
 580
 581         MapNode n_water(c_water_source);
 582         MapNode n_air(CONTENT_AIR);
 583         u32 index = 0;
 584         float width = 0.2; // TODO: figure out acceptable perlin noise values
 585
 586         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 587         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 588                 u32 vi = vm->m_area.index(node_min.X, y, z);
 589                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 590                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 591
 592                         if (heightmap[j] < water_level - 16)
 593                                 continue;
 594
 595                         float uwatern = noise_ridge_uwater->result[j] * 2;
 596                         if (fabs(uwatern) > width)
 597                                 continue;
 598
 599                         float altitude = y - water_level;
 600                         float height_mod = (altitude + 17) / 2.5;
 601                         float width_mod  = width - fabs(uwatern);
 602                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 603
 604                         if (nridge + width_mod * height_mod < 0.6)
 605                                 continue;
 606
 607                         if (y < ridge_heightmap[j])
 608                                 ridge_heightmap[j] = y - 1;
 609
 610                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 611                 }
 612         }
 613 }
 614
 615
 616 MgStoneType MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 617 {
 618         v3s16 em = vm->m_area.getExtent();
 619         u32 index = 0;
 620         MgStoneType stone_type = STONE;
 621
 622         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 623         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 624                 Biome *biome = NULL;
 625                 u16 depth_top = 0;
 626                 u16 base_filler = 0;
 627                 u16 depth_water_top = 0;
 628                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 629
 630                 // Check node at base of mapchunk above, either a node of a previously
 631                 // generated mapchunk or if not, a node of overgenerated base terrain.
 632                 content_t c_above = vm->m_data[vi + em.X].getContent();
 633                 bool air_above = c_above == CONTENT_AIR;
 634                 bool water_above = c_above == c_water_source;
 635
 636                 // If there is air or water above enable top/filler placement, otherwise force
 637                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 638                 u16 nplaced = (air_above || water_above) ? 0 : (u16)-1;
 639
 640                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 641                         content_t c = vm->m_data[vi].getContent();
 642
 643                         // Biome is recalculated each time an upper surface is detected while
 644                         // working down a column. The selected biome then remains in effect for
 645                         // all nodes below until the next surface and biome recalculation.
 646                         // Biome is recalculated:
 647                         // 1. At the surface of stone below air or water.
 648                         // 2. At the surface of water below air.
 649                         // 3. When stone or water is detected but biome has not yet been calculated.
 650                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 651                                         (c == c_water_source && (air_above || !biome))) {
 652                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 653                                 depth_top = biome->depth_top;
 654                                 base_filler = MYMAX(depth_top + biome->depth_filler
 655                                                 + noise_filler_depth->result[index], 0);
 656                                 depth_water_top = biome->depth_water_top;
 657
 658                                 // Detect stone type for dungeons during every biome calculation.
 659                                 // This is more efficient than detecting per-node and will not
 660                                 // miss any desert stone or sandstone biomes.
 661                                 if (biome->c_stone == c_desert_stone)
 662                                         stone_type = DESERT_STONE;
 663                                 else if (biome->c_stone == c_sandstone)
 664                                         stone_type = SANDSTONE;
 665                         }
 666
 667                         if (c == c_stone) {
 668                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 669
 670                                 // If the node below isn't solid, make this node stone, so that
 671                                 // any top/filler nodes above are structurally supported.
 672                                 // This is done by aborting the cycle of top/filler placement
 673                                 // immediately by forcing nplaced to stone level.
 674                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 675                                         nplaced = (u16)-1;
 676
 677                                 if (nplaced < depth_top) {
 678                                         vm->m_data[vi] = MapNode(biome->c_top);
 679                                         nplaced++;
 680                                 } else if (nplaced < base_filler) {
 681                                         vm->m_data[vi] = MapNode(biome->c_filler);
 682                                         nplaced++;
 683                                 } else {
 684                                         vm->m_data[vi] = MapNode(biome->c_stone);
 685                                 }
 686
 687                                 air_above = false;
 688                                 water_above = false;
 689                         } else if (c == c_water_source) {
 690                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 691                                                 biome->c_water_top : biome->c_water);
 692                                 nplaced = 0;  // Enable top/filler placement for next surface
 693                                 air_above = false;
 694                                 water_above = true;
 695                         } else if (c == CONTENT_AIR) {
 696                                 nplaced = 0;  // Enable top/filler placement for next surface
 697                                 air_above = true;
 698                                 water_above = false;
 699                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 700                                 nplaced = (u16)-1;  // Disable top/filler placement
 701                                 air_above = false;
 702                                 water_above = false;
 703                         }
 704
 705                         vm->m_area.add_y(em, vi, -1);
 706                 }
 707         }
 708
 709         return stone_type;
 710 }
 711
 712
 713 void MapgenV7::dustTopNodes()
 714 {
 715         if (node_max.Y < water_level)
 716                 return;
 717
 718         v3s16 em = vm->m_area.getExtent();
 719         u32 index = 0;
 720
 721         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 722         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 723                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 724
 725                 if (biome->c_dust == CONTENT_IGNORE)
 726                         continue;
 727
 728                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 729                 content_t c_full_max = vm->m_data[vi].getContent();
 730                 s16 y_start;
 731
 732                 if (c_full_max == CONTENT_AIR) {
 733                         y_start = full_node_max.Y - 1;
 734                 } else if (c_full_max == CONTENT_IGNORE) {
 735                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 736                         content_t c_max = vm->m_data[vi].getContent();
 737
 738                         if (c_max == CONTENT_AIR)
 739                                 y_start = node_max.Y;
 740                         else
 741                                 continue;
 742                 } else {
 743                         continue;
 744                 }
 745
 746                 vi = vm->m_area.index(x, y_start, z);
 747                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 748                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 749                                 break;
 750
 751                         vm->m_area.add_y(em, vi, -1);
 752                 }
 753
 754                 content_t c = vm->m_data[vi].getContent();
 755                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 756                         vm->m_area.add_y(em, vi, 1);
 757                         vm->m_data[vi] = MapNode(biome->c_dust);
 758                 }
 759         }
 760 }
 761
 762
 763 #if 0
 764 void MapgenV7::addTopNodes()
 765 {
 766         v3s16 em = vm->m_area.getExtent();
 767         s16 ntopnodes;
 768         u32 index = 0;
 769
 770         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 771         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 772                 Biome *biome = bmgr->biomes[biomemap[index]];
 773
 774                 //////////////////// First, add top nodes below the ridge
 775                 s16 y = ridge_heightmap[index];
 776
 777                 // This cutoff is good enough, but not perfect.
 778                 // It will cut off potentially placed top nodes at chunk boundaries
 779                 if (y < node_min.Y)
 780                         continue;
 781                 if (y > node_max.Y) {
 782                         y = node_max.Y; // Let's see if we can still go downward anyway
 783                         u32 vi = vm->m_area.index(x, y, z);
 784                         content_t c = vm->m_data[vi].getContent();
 785                         if (ndef->get(c).walkable)
 786                                 continue;
 787                 }
 788
 789                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 790                 // might not be the actual height, just the lowest part in the chunk
 791                 // where a ridge had been carved
 792                 u32 i = vm->m_area.index(x, y, z);
 793                 for (; y >= node_min.Y; y--) {
 794                         content_t c = vm->m_data[i].getContent();
 795                         if (ndef->get(c).walkable)
 796                                 break;
 797                         vm->m_area.add_y(em, i, -1);
 798                 }
 799
 800                 if (y != node_min.Y - 1 && y >= water_level) {
 801                         ridge_heightmap[index] = y; //update ridgeheight
 802                         ntopnodes = biome->top_depth;
 803                         for (; y <= node_max.Y && ntopnodes; y++) {
 804                                 ntopnodes--;
 805                                 vm->m_data[i] = MapNode(biome->c_top);
 806                                 vm->m_area.add_y(em, i, 1);
 807                         }
 808                         // If dirt, grow grass on it.
 809                         if (y > water_level - 10 &&
 810                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 811                                 vm->m_area.add_y(em, i, -1);
 812                                 if (vm->m_data[i].getContent() == c_dirt)
 813                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 814                         }
 815                 }
 816
 817                 //////////////////// Now, add top nodes on top of the ridge
 818                 y = heightmap[index];
 819                 if (y > node_max.Y) {
 820                         y = node_max.Y; // Let's see if we can still go downward anyway
 821                         u32 vi = vm->m_area.index(x, y, z);
 822                         content_t c = vm->m_data[vi].getContent();
 823                         if (ndef->get(c).walkable)
 824                                 continue;
 825                 }
 826
 827                 i = vm->m_area.index(x, y, z);
 828                 for (; y >= node_min.Y; y--) {
 829                         content_t c = vm->m_data[i].getContent();
 830                         if (ndef->get(c).walkable)
 831                                 break;
 832                         vm->m_area.add_y(em, i, -1);
 833                 }
 834
 835                 if (y != node_min.Y - 1) {
 836                         ntopnodes = biome->top_depth;
 837                         // Let's see if we've already added it...
 838                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 839                                 continue;
 840
 841                         for (; y <= node_max.Y && ntopnodes; y++) {
 842                                 ntopnodes--;
 843                                 vm->m_data[i] = MapNode(biome->c_top);
 844                                 vm->m_area.add_y(em, i, 1);
 845                         }
 846                         // If dirt, grow grass on it.
 847                         if (y > water_level - 10 &&
 848                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 849                                 vm->m_area.add_y(em, i, -1);
 850                                 if (vm->m_data[i].getContent() == c_dirt)
 851                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 852                         }
 853                 }
 854         }
 855 }
 856 #endif
 857
 858
 859 void MapgenV7::generateCaves(s16 max_stone_y)
 860 {
 861         if (max_stone_y >= node_min.Y) {
 862                 u32 index   = 0;
 863
 864                 for (s16 z = node_min.Z; z <= node_max.Z; z++)
 865                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 866                         u32 i = vm->m_area.index(node_min.X, y, z);
 867                         for (s16 x = node_min.X; x <= node_max.X; x++, i++, index++) {
 868                                 float d1 = contour(noise_cave1->result[index]);
 869                                 float d2 = contour(noise_cave2->result[index]);
 870                                 if (d1 * d2 > 0.3) {
 871                                         content_t c = vm->m_data[i].getContent();
 872                                         if (!ndef->get(c).is_ground_content || c == CONTENT_AIR)
 873                                                 continue;
 874
 875                                         vm->m_data[i] = MapNode(CONTENT_AIR);
 876                                 }
 877                         }
 878                 }
 879         }
 880
 881         PseudoRandom ps(blockseed + 21343);
 882         u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
 883         for (u32 i = 0; i < bruises_count; i++) {
 884                 CaveV7 cave(this, &ps);
 885                 cave.makeCave(node_min, node_max, max_stone_y);
 886         }
 887 }