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