src/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2010-2015 paramat, Matt Gregory
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21
  22 #include "mapgen.h"
  23 #include "voxel.h"
  24 #include "noise.h"
  25 #include "mapblock.h"
  26 #include "mapnode.h"
  27 #include "map.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "voxelalgorithms.h"
  31 //#include "profiler.h" // For TimeTaker
  32 #include "settings.h" // For g_settings
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.h"
  36 #include "treegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_v7.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_v7[] = {
  44         {"mountains", MGV7_MOUNTAINS},
  45         {"ridges",    MGV7_RIDGES},
  46         {NULL,        0}
  47 };
  48
  49
  50 ///////////////////////////////////////////////////////////////////////////////
  51
  52
  53 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  54         : Mapgen(mapgenid, params, emerge)
  55 {
  56         this->m_emerge = emerge;
  57         this->bmgr     = emerge->biomemgr;
  58
  59         //// amount of elements to skip for the next index
  60         //// for noise/height/biome maps (not vmanip)
  61         this->ystride = csize.X;
  62         this->zstride = csize.X * (csize.Y + 2);
  63
  64         this->biomemap        = new u8[csize.X * csize.Z];
  65         this->heightmap       = new s16[csize.X * csize.Z];
  66         this->heatmap         = NULL;
  67         this->humidmap        = NULL;
  68         this->ridge_heightmap = new s16[csize.X * csize.Z];
  69
  70         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  71         this->spflags = sp->spflags;
  72
  73         //// Terrain noise
  74         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  75         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  76         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  77         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  78         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  79         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  80         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  81
  82         //// 3d terrain noise
  83         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  84         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  85         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y + 2, csize.Z);
  86         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y + 2, csize.Z);
  87
  88         //// Biome noise
  89         noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
  90         noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
  91         noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
  92         noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
  93
  94         //// Resolve nodes to be used
  95         INodeDefManager *ndef = emerge->ndef;
  96
  97         c_stone                = ndef->getId("mapgen_stone");
  98         c_water_source         = ndef->getId("mapgen_water_source");
  99         c_lava_source          = ndef->getId("mapgen_lava_source");
 100         c_desert_stone         = ndef->getId("mapgen_desert_stone");
 101         c_ice                  = ndef->getId("mapgen_ice");
 102         c_sandstone            = ndef->getId("mapgen_sandstone");
 103
 104         c_cobble               = ndef->getId("mapgen_cobble");
 105         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 106         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 107         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 108         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 109
 110         if (c_ice == CONTENT_IGNORE)
 111                 c_ice = CONTENT_AIR;
 112         if (c_mossycobble == CONTENT_IGNORE)
 113                 c_mossycobble = c_cobble;
 114         if (c_stair_cobble == CONTENT_IGNORE)
 115                 c_stair_cobble = c_cobble;
 116         if (c_sandstonebrick == CONTENT_IGNORE)
 117                 c_sandstonebrick = c_sandstone;
 118         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 119                 c_stair_sandstonebrick = c_sandstone;
 120 }
 121
 122
 123 MapgenV7::~MapgenV7()
 124 {
 125         delete noise_terrain_base;
 126         delete noise_terrain_persist;
 127         delete noise_height_select;
 128         delete noise_terrain_alt;
 129         delete noise_filler_depth;
 130         delete noise_mount_height;
 131         delete noise_ridge_uwater;
 132         delete noise_mountain;
 133         delete noise_ridge;
 134         delete noise_cave1;
 135         delete noise_cave2;
 136
 137         delete noise_heat;
 138         delete noise_humidity;
 139         delete noise_heat_blend;
 140         delete noise_humidity_blend;
 141
 142         delete[] ridge_heightmap;
 143         delete[] heightmap;
 144         delete[] biomemap;
 145 }
 146
 147
 148 MapgenV7Params::MapgenV7Params()
 149 {
 150         spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
 151
 152         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 153         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 154         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 155         np_height_select   = NoiseParams(-12,  24,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 156         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 157         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 158         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 159         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 160         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 161         np_cave1           = NoiseParams(0,    12,  v3f(96,   96,   96),   52534, 4, 0.5,  2.0);
 162         np_cave2           = NoiseParams(0,    12,  v3f(96,   96,   96),   10325, 4, 0.5,  2.0);
 163 }
 164
 165
 166 void MapgenV7Params::readParams(const Settings *settings)
 167 {
 168         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 169
 170         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 171         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 172         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 173         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 174         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 175         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 176         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 177         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 178         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 179         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 180         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 181 }
 182
 183
 184 void MapgenV7Params::writeParams(Settings *settings) const
 185 {
 186         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, U32_MAX);
 187
 188         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 189         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 190         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 191         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 192         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 193         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 194         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 195         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 196         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 197         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 198         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 199 }
 200
 201
 202 ///////////////////////////////////////
 203
 204
 205 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 206 {
 207         // Base terrain calculation
 208         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 209
 210         // Ridge/river terrain calculation
 211         float width = 0.2;
 212         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 213         // if inside a river this is an unsuitable spawn point
 214         if (fabs(uwatern) <= width)
 215                 return MAX_MAP_GENERATION_LIMIT;
 216
 217         // Mountain terrain calculation
 218         int iters = 128;
 219         while (iters--) {
 220                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // Air, y is ground level
 221                         if (y <= water_level || y > water_level + 16)
 222                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 223                         else
 224                                 return y;
 225                 }
 226                 y++;
 227         }
 228
 229         // Unsuitable spawn point, no ground surface found
 230         return MAX_MAP_GENERATION_LIMIT;
 231 }
 232
 233
 234 void MapgenV7::makeChunk(BlockMakeData *data)
 235 {
 236         // Pre-conditions
 237         assert(data->vmanip);
 238         assert(data->nodedef);
 239         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 240                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 241                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 242         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 243                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 244                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 245
 246         this->generating = true;
 247         this->vm   = data->vmanip;
 248         this->ndef = data->nodedef;
 249         //TimeTaker t("makeChunk");
 250
 251         v3s16 blockpos_min = data->blockpos_min;
 252         v3s16 blockpos_max = data->blockpos_max;
 253         node_min = blockpos_min * MAP_BLOCKSIZE;
 254         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 255         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 256         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 257
 258         blockseed = getBlockSeed2(full_node_min, seed);
 259
 260         // Make some noise
 261         calculateNoise();
 262
 263         // Generate base terrain, mountains, and ridges with initial heightmaps
 264         s16 stone_surface_max_y = generateTerrain();
 265
 266         // Create heightmap
 267         updateHeightmap(node_min, node_max);
 268
 269         // Create biomemap at heightmap surface
 270         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 271                 noise_humidity->result, heightmap, biomemap);
 272
 273         // Actually place the biome-specific nodes
 274         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 275
 276         if (flags & MG_CAVES)
 277                 generateCaves(stone_surface_max_y);
 278
 279         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 280                 DungeonParams dp;
 281
 282                 dp.np_rarity  = nparams_dungeon_rarity;
 283                 dp.np_density = nparams_dungeon_density;
 284                 dp.np_wetness = nparams_dungeon_wetness;
 285                 dp.c_water    = c_water_source;
 286                 if (stone_type == STONE) {
 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                 } else if (stone_type == DESERT_STONE) {
 297                         dp.c_cobble = c_desert_stone;
 298                         dp.c_moss   = c_desert_stone;
 299                         dp.c_stair  = c_desert_stone;
 300
 301                         dp.diagonal_dirs = true;
 302                         dp.mossratio     = 0.0;
 303                         dp.holesize      = v3s16(2, 3, 2);
 304                         dp.roomsize      = v3s16(2, 5, 2);
 305                         dp.notifytype    = GENNOTIFY_TEMPLE;
 306                 } else if (stone_type == SANDSTONE) {
 307                         dp.c_cobble = c_sandstonebrick;
 308                         dp.c_moss   = c_sandstonebrick;
 309                         dp.c_stair  = c_sandstonebrick;
 310
 311                         dp.diagonal_dirs = false;
 312                         dp.mossratio     = 0.0;
 313                         dp.holesize      = v3s16(2, 2, 2);
 314                         dp.roomsize      = v3s16(2, 0, 2);
 315                         dp.notifytype    = GENNOTIFY_DUNGEON;
 316                 }
 317
 318                 DungeonGen dgen(this, &dp);
 319                 dgen.generate(blockseed, full_node_min, full_node_max);
 320         }
 321
 322         // Generate the registered decorations
 323         if (flags & MG_DECORATIONS)
 324                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 325
 326         // Generate the registered ores
 327         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 328
 329         // Sprinkle some dust on top after everything else was generated
 330         dustTopNodes();
 331
 332         //printf("makeChunk: %dms\n", t.stop());
 333
 334         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 335
 336         if (flags & MG_LIGHT)
 337                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 338                         full_node_min, full_node_max);
 339
 340         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 341         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 342
 343         this->generating = false;
 344 }
 345
 346
 347 void MapgenV7::calculateNoise()
 348 {
 349         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 350         s16 x = node_min.X;
 351         s16 y = node_min.Y - 1;
 352         s16 z = node_min.Z;
 353
 354         noise_terrain_persist->perlinMap2D(x, z);
 355         float *persistmap = noise_terrain_persist->result;
 356
 357         noise_terrain_base->perlinMap2D(x, z, persistmap);
 358         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 359         noise_height_select->perlinMap2D(x, z);
 360
 361         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 362                 noise_ridge->perlinMap3D(x, y, z);
 363                 noise_ridge_uwater->perlinMap2D(x, z);
 364         }
 365
 366         // Cave noises are calculated in generateCaves()
 367         // only if solid terrain is present in mapchunk
 368
 369         // Mountain noises are calculated in generateMountainTerrain()
 370         // only if solid terrain surface dips into mapchunk
 371
 372         noise_filler_depth->perlinMap2D(x, z);
 373         noise_heat->perlinMap2D(x, z);
 374         noise_humidity->perlinMap2D(x, z);
 375         noise_heat_blend->perlinMap2D(x, z);
 376         noise_humidity_blend->perlinMap2D(x, z);
 377
 378         for (s32 i = 0; i < csize.X * csize.Z; i++) {
 379                 noise_heat->result[i] += noise_heat_blend->result[i];
 380                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 381         }
 382
 383         heatmap = noise_heat->result;
 384         humidmap = noise_humidity->result;
 385         //printf("calculateNoise: %dus\n", t.stop());
 386 }
 387
 388
 389 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 390 {
 391         float heat = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed) +
 392                 NoisePerlin2D(&noise_heat_blend->np, p.X, p.Z, seed);
 393         float humidity = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed) +
 394                 NoisePerlin2D(&noise_humidity_blend->np, p.X, p.Z, seed);
 395         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 396
 397         return bmgr->getBiome(heat, humidity, groundlevel);
 398 }
 399
 400 //needs to be updated
 401 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 402 {
 403         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 404         hselect = rangelim(hselect, 0.0, 1.0);
 405
 406         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 407
 408         noise_terrain_base->np.persist = persist;
 409         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 410
 411         noise_terrain_alt->np.persist = persist;
 412         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 413
 414         if (height_alt > height_base)
 415                 return height_alt;
 416
 417         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 418 }
 419
 420
 421 float MapgenV7::baseTerrainLevelFromMap(int index)
 422 {
 423         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 424         float height_base = noise_terrain_base->result[index];
 425         float height_alt  = noise_terrain_alt->result[index];
 426
 427         if (height_alt > height_base)
 428                 return height_alt;
 429
 430         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 431 }
 432
 433
 434 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 435 {
 436         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 437         float density_gradient = -((float)y / mnt_h_n);
 438         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 439
 440         return mnt_n + density_gradient >= 0.0;
 441 }
 442
 443
 444 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 445 {
 446         float mounthn = noise_mount_height->result[idx_xz];
 447         float density_gradient = -((float)y / mounthn);
 448         float mountn = noise_mountain->result[idx_xyz];
 449
 450         return mountn + density_gradient >= 0.0;
 451 }
 452
 453
 454 #if 0
 455 void MapgenV7::carveRivers() {
 456         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 457         MapNode n_stone(c_stone);
 458         u32 index = 0;
 459
 460         int river_depth = 4;
 461
 462         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 463         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 464                 float terrain_mod  = noise_terrain_mod->result[index];
 465                 NoiseParams *np = noise_terrain_river->np;
 466                 np.persist = noise_terrain_persist->result[index];
 467                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 468                 float height = terrain_river * (1 - abs(terrain_mod)) *
 469                                                 noise_terrain_river->np.scale;
 470                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 471
 472                 s16 y = heightmap[index];
 473                 if (height < 1.0 && y > river_depth &&
 474                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 475
 476                         for (s16 ry = y; ry != y - river_depth; ry--) {
 477                                 u32 vi = vm->m_area.index(x, ry, z);
 478                                 vm->m_data[vi] = n_air;
 479                         }
 480
 481                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 482                         vm->m_data[vi] = n_water_source;
 483                 }
 484         }
 485 }
 486 #endif
 487
 488
 489 int MapgenV7::generateTerrain()
 490 {
 491         s16 stone_surface_min_y;
 492         s16 stone_surface_max_y;
 493
 494         generateBaseTerrain(&stone_surface_min_y, &stone_surface_max_y);
 495
 496         if ((spflags & MGV7_MOUNTAINS) && stone_surface_min_y < node_max.Y)
 497                 stone_surface_max_y = generateMountainTerrain(stone_surface_max_y);
 498
 499         if (spflags & MGV7_RIDGES)
 500                 generateRidgeTerrain();
 501
 502         return stone_surface_max_y;
 503 }
 504
 505
 506 void MapgenV7::generateBaseTerrain(s16 *stone_surface_min_y, s16 *stone_surface_max_y)
 507 {
 508         MapNode n_air(CONTENT_AIR);
 509         MapNode n_stone(c_stone);
 510         MapNode n_water(c_water_source);
 511
 512         v3s16 em = vm->m_area.getExtent();
 513         s16 surface_min_y = MAX_MAP_GENERATION_LIMIT;
 514         s16 surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 515         u32 index = 0;
 516
 517         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 518         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 519                 float surface_height = baseTerrainLevelFromMap(index);
 520                 s16 surface_y = (s16)surface_height;
 521
 522                 heightmap[index]       = surface_y;
 523                 ridge_heightmap[index] = surface_y;
 524
 525                 if (surface_y < surface_min_y)
 526                         surface_min_y = surface_y;
 527
 528                 if (surface_y > surface_max_y)
 529                         surface_max_y = surface_y;
 530
 531                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 532                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 533                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 534                                 if (y <= surface_y)
 535                                         vm->m_data[vi] = n_stone;
 536                                 else if (y <= water_level)
 537                                         vm->m_data[vi] = n_water;
 538                                 else
 539                                         vm->m_data[vi] = n_air;
 540                         }
 541                         vm->m_area.add_y(em, vi, 1);
 542                 }
 543         }
 544
 545         *stone_surface_min_y = surface_min_y;
 546         *stone_surface_max_y = surface_max_y;
 547 }
 548
 549
 550 int MapgenV7::generateMountainTerrain(s16 ymax)
 551 {
 552         noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 553         noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 554
 555         MapNode n_stone(c_stone);
 556         u32 j = 0;
 557
 558         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 559         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 560                 u32 vi = vm->m_area.index(node_min.X, y, z);
 561                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 562                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 563                         content_t c = vm->m_data[vi].getContent();
 564
 565                         if (getMountainTerrainFromMap(j, index, y)
 566                                         && (c == CONTENT_AIR || c == c_water_source)) {
 567                                 vm->m_data[vi] = n_stone;
 568                                 if (y > ymax)
 569                                         ymax = y;
 570                         }
 571
 572                         vi++;
 573                         j++;
 574                 }
 575         }
 576
 577         return ymax;
 578 }
 579
 580
 581 void MapgenV7::generateRidgeTerrain()
 582 {
 583         if (node_max.Y < water_level)
 584                 return;
 585
 586         MapNode n_water(c_water_source);
 587         MapNode n_air(CONTENT_AIR);
 588         u32 index = 0;
 589         float width = 0.2;
 590
 591         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 592         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 593                 u32 vi = vm->m_area.index(node_min.X, y, z);
 594                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 595                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 596
 597                         if (heightmap[j] < water_level - 16)
 598                                 continue;
 599
 600                         float uwatern = noise_ridge_uwater->result[j] * 2;
 601                         if (fabs(uwatern) > width)
 602                                 continue;
 603
 604                         float altitude = y - water_level;
 605                         float height_mod = (altitude + 17) / 2.5;
 606                         float width_mod  = width - fabs(uwatern);
 607                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 608
 609                         if (nridge + width_mod * height_mod < 0.6)
 610                                 continue;
 611
 612                         if (y < ridge_heightmap[j])
 613                                 ridge_heightmap[j] = y - 1;
 614
 615                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 616                 }
 617         }
 618 }
 619
 620
 621 MgStoneType MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 622 {
 623         v3s16 em = vm->m_area.getExtent();
 624         u32 index = 0;
 625         MgStoneType stone_type = STONE;
 626
 627         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 628         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 629                 Biome *biome = NULL;
 630                 u16 depth_top = 0;
 631                 u16 base_filler = 0;
 632                 u16 depth_water_top = 0;
 633                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 634
 635                 // Check node at base of mapchunk above, either a node of a previously
 636                 // generated mapchunk or if not, a node of overgenerated base terrain.
 637                 content_t c_above = vm->m_data[vi + em.X].getContent();
 638                 bool air_above = c_above == CONTENT_AIR;
 639                 bool water_above = c_above == c_water_source;
 640
 641                 // If there is air or water above enable top/filler placement, otherwise force
 642                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 643                 u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
 644
 645                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 646                         content_t c = vm->m_data[vi].getContent();
 647
 648                         // Biome is recalculated each time an upper surface is detected while
 649                         // working down a column. The selected biome then remains in effect for
 650                         // all nodes below until the next surface and biome recalculation.
 651                         // Biome is recalculated:
 652                         // 1. At the surface of stone below air or water.
 653                         // 2. At the surface of water below air.
 654                         // 3. When stone or water is detected but biome has not yet been calculated.
 655                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 656                                         (c == c_water_source && (air_above || !biome))) {
 657                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 658                                 depth_top = biome->depth_top;
 659                                 base_filler = MYMAX(depth_top + biome->depth_filler
 660                                                 + noise_filler_depth->result[index], 0);
 661                                 depth_water_top = biome->depth_water_top;
 662
 663                                 // Detect stone type for dungeons during every biome calculation.
 664                                 // This is more efficient than detecting per-node and will not
 665                                 // miss any desert stone or sandstone biomes.
 666                                 if (biome->c_stone == c_desert_stone)
 667                                         stone_type = DESERT_STONE;
 668                                 else if (biome->c_stone == c_sandstone)
 669                                         stone_type = SANDSTONE;
 670                         }
 671
 672                         if (c == c_stone) {
 673                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 674
 675                                 // If the node below isn't solid, make this node stone, so that
 676                                 // any top/filler nodes above are structurally supported.
 677                                 // This is done by aborting the cycle of top/filler placement
 678                                 // immediately by forcing nplaced to stone level.
 679                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 680                                         nplaced = U16_MAX;
 681
 682                                 if (nplaced < depth_top) {
 683                                         vm->m_data[vi] = MapNode(biome->c_top);
 684                                         nplaced++;
 685                                 } else if (nplaced < base_filler) {
 686                                         vm->m_data[vi] = MapNode(biome->c_filler);
 687                                         nplaced++;
 688                                 } else {
 689                                         vm->m_data[vi] = MapNode(biome->c_stone);
 690                                 }
 691
 692                                 air_above = false;
 693                                 water_above = false;
 694                         } else if (c == c_water_source) {
 695                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 696                                                 biome->c_water_top : biome->c_water);
 697                                 nplaced = 0;  // Enable top/filler placement for next surface
 698                                 air_above = false;
 699                                 water_above = true;
 700                         } else if (c == CONTENT_AIR) {
 701                                 nplaced = 0;  // Enable top/filler placement for next surface
 702                                 air_above = true;
 703                                 water_above = false;
 704                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 705                                 nplaced = U16_MAX;  // Disable top/filler placement
 706                                 air_above = false;
 707                                 water_above = false;
 708                         }
 709
 710                         vm->m_area.add_y(em, vi, -1);
 711                 }
 712         }
 713
 714         return stone_type;
 715 }
 716
 717
 718 void MapgenV7::dustTopNodes()
 719 {
 720         if (node_max.Y < water_level)
 721                 return;
 722
 723         v3s16 em = vm->m_area.getExtent();
 724         u32 index = 0;
 725
 726         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 727         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 728                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 729
 730                 if (biome->c_dust == CONTENT_IGNORE)
 731                         continue;
 732
 733                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 734                 content_t c_full_max = vm->m_data[vi].getContent();
 735                 s16 y_start;
 736
 737                 if (c_full_max == CONTENT_AIR) {
 738                         y_start = full_node_max.Y - 1;
 739                 } else if (c_full_max == CONTENT_IGNORE) {
 740                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 741                         content_t c_max = vm->m_data[vi].getContent();
 742
 743                         if (c_max == CONTENT_AIR)
 744                                 y_start = node_max.Y;
 745                         else
 746                                 continue;
 747                 } else {
 748                         continue;
 749                 }
 750
 751                 vi = vm->m_area.index(x, y_start, z);
 752                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 753                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 754                                 break;
 755
 756                         vm->m_area.add_y(em, vi, -1);
 757                 }
 758
 759                 content_t c = vm->m_data[vi].getContent();
 760                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 761                         vm->m_area.add_y(em, vi, 1);
 762                         vm->m_data[vi] = MapNode(biome->c_dust);
 763                 }
 764         }
 765 }
 766
 767
 768 #if 0
 769 void MapgenV7::addTopNodes()
 770 {
 771         v3s16 em = vm->m_area.getExtent();
 772         s16 ntopnodes;
 773         u32 index = 0;
 774
 775         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 776         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 777                 Biome *biome = bmgr->biomes[biomemap[index]];
 778
 779                 //////////////////// First, add top nodes below the ridge
 780                 s16 y = ridge_heightmap[index];
 781
 782                 // This cutoff is good enough, but not perfect.
 783                 // It will cut off potentially placed top nodes at chunk boundaries
 784                 if (y < node_min.Y)
 785                         continue;
 786                 if (y > node_max.Y) {
 787                         y = node_max.Y; // Let's see if we can still go downward anyway
 788                         u32 vi = vm->m_area.index(x, y, z);
 789                         content_t c = vm->m_data[vi].getContent();
 790                         if (ndef->get(c).walkable)
 791                                 continue;
 792                 }
 793
 794                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 795                 // might not be the actual height, just the lowest part in the chunk
 796                 // where a ridge had been carved
 797                 u32 i = vm->m_area.index(x, y, z);
 798                 for (; y >= node_min.Y; y--) {
 799                         content_t c = vm->m_data[i].getContent();
 800                         if (ndef->get(c).walkable)
 801                                 break;
 802                         vm->m_area.add_y(em, i, -1);
 803                 }
 804
 805                 if (y != node_min.Y - 1 && y >= water_level) {
 806                         ridge_heightmap[index] = y; //update ridgeheight
 807                         ntopnodes = biome->top_depth;
 808                         for (; y <= node_max.Y && ntopnodes; y++) {
 809                                 ntopnodes--;
 810                                 vm->m_data[i] = MapNode(biome->c_top);
 811                                 vm->m_area.add_y(em, i, 1);
 812                         }
 813                         // If dirt, grow grass on it.
 814                         if (y > water_level - 10 &&
 815                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 816                                 vm->m_area.add_y(em, i, -1);
 817                                 if (vm->m_data[i].getContent() == c_dirt)
 818                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 819                         }
 820                 }
 821
 822                 //////////////////// Now, add top nodes on top of the ridge
 823                 y = heightmap[index];
 824                 if (y > node_max.Y) {
 825                         y = node_max.Y; // Let's see if we can still go downward anyway
 826                         u32 vi = vm->m_area.index(x, y, z);
 827                         content_t c = vm->m_data[vi].getContent();
 828                         if (ndef->get(c).walkable)
 829                                 continue;
 830                 }
 831
 832                 i = vm->m_area.index(x, y, z);
 833                 for (; y >= node_min.Y; y--) {
 834                         content_t c = vm->m_data[i].getContent();
 835                         if (ndef->get(c).walkable)
 836                                 break;
 837                         vm->m_area.add_y(em, i, -1);
 838                 }
 839
 840                 if (y != node_min.Y - 1) {
 841                         ntopnodes = biome->top_depth;
 842                         // Let's see if we've already added it...
 843                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 844                                 continue;
 845
 846                         for (; y <= node_max.Y && ntopnodes; y++) {
 847                                 ntopnodes--;
 848                                 vm->m_data[i] = MapNode(biome->c_top);
 849                                 vm->m_area.add_y(em, i, 1);
 850                         }
 851                         // If dirt, grow grass on it.
 852                         if (y > water_level - 10 &&
 853                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 854                                 vm->m_area.add_y(em, i, -1);
 855                                 if (vm->m_data[i].getContent() == c_dirt)
 856                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 857                         }
 858                 }
 859         }
 860 }
 861 #endif
 862
 863
 864 void MapgenV7::generateCaves(s16 max_stone_y)
 865 {
 866         if (max_stone_y < node_min.Y)
 867                 return;
 868
 869         noise_cave1->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 870         noise_cave2->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 871
 872         v3s16 em = vm->m_area.getExtent();
 873         u32 index2d = 0;
 874
 875         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 876         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 877                 bool column_is_open = false;  // Is column open to overground
 878                 u32 vi = vm->m_area.index(x, node_max.Y + 1, z);
 879                 u32 index3d = (z - node_min.Z) * zstride + (csize.Y + 1) * ystride +
 880                         (x - node_min.X);
 881                 // Biome of column
 882                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index2d]);
 883
 884                 for (s16 y = node_max.Y + 1; y >= node_min.Y - 1;
 885                                 y--, index3d -= ystride, vm->m_area.add_y(em, vi, -1)) {
 886                         content_t c = vm->m_data[vi].getContent();
 887                         if (c == CONTENT_AIR || c == biome->c_water_top ||
 888                                         c == biome->c_water) {
 889                                 column_is_open = true;
 890                                 continue;
 891                         }
 892                         // Ground
 893                         float d1 = contour(noise_cave1->result[index3d]);
 894                         float d2 = contour(noise_cave2->result[index3d]);
 895                         if (d1 * d2 > 0.3f && ndef->get(c).is_ground_content) {
 896                                 // In tunnel and ground content, excavate
 897                                 vm->m_data[vi] = MapNode(CONTENT_AIR);
 898                         } else if (column_is_open &&
 899                                         (c == biome->c_filler || c == biome->c_stone)) {
 900                                 // Tunnel entrance floor
 901                                 vm->m_data[vi] = MapNode(biome->c_top);
 902                                 column_is_open = false;
 903                         } else {
 904                                 column_is_open = false;
 905                         }
 906                 }
 907         }
 908
 909         PseudoRandom ps(blockseed + 21343);
 910         u32 bruises_count = ps.range(0, 2);
 911         for (u32 i = 0; i < bruises_count; i++) {
 912                 CaveV7 cave(this, &ps);
 913                 cave.makeCave(node_min, node_max, max_stone_y);
 914         }
 915 }