src/mapgen/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013-2018 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2014-2018 paramat
   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 <cmath>
  24 #include "voxel.h"
  25 #include "noise.h"
  26 #include "mapblock.h"
  27 #include "mapnode.h"
  28 #include "map.h"
  29 #include "content_sao.h"
  30 #include "nodedef.h"
  31 #include "voxelalgorithms.h"
  32 #include "settings.h" // For g_settings
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.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         {"floatlands",  MGV7_FLOATLANDS},
  46         {"caverns",     MGV7_CAVERNS},
  47         {NULL,          0}
  48 };
  49
  50
  51 ///////////////////////////////////////////////////////////////////////////////
  52
  53
  54 MapgenV7::MapgenV7(int mapgenid, MapgenV7Params *params, EmergeManager *emerge)
  55         : MapgenBasic(mapgenid, params, emerge)
  56 {
  57         spflags              = params->spflags;
  58         mount_zero_level     = params->mount_zero_level;
  59         cave_width           = params->cave_width;
  60         large_cave_depth     = params->large_cave_depth;
  61         lava_depth           = params->lava_depth;
  62         float_mount_density  = params->float_mount_density;
  63         float_mount_exponent = params->float_mount_exponent;
  64         floatland_level      = params->floatland_level;
  65         shadow_limit         = params->shadow_limit;
  66         cavern_limit         = params->cavern_limit;
  67         cavern_taper         = params->cavern_taper;
  68         cavern_threshold     = params->cavern_threshold;
  69         dungeon_ymin         = params->dungeon_ymin;
  70         dungeon_ymax         = params->dungeon_ymax;
  71
  72         // This is to avoid a divide-by-zero.
  73         // Parameter will be saved to map_meta.txt in limited form.
  74         params->float_mount_height = MYMAX(params->float_mount_height, 1.0f);
  75         float_mount_height   = params->float_mount_height;
  76
  77         // 2D noise
  78         noise_terrain_base    = new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  79         noise_terrain_alt     = new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  80         noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  81         noise_height_select   = new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  82         noise_filler_depth    = new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  83
  84         if (spflags & MGV7_MOUNTAINS)
  85                 noise_mount_height = new Noise(&params->np_mount_height, seed, csize.X, csize.Z);
  86
  87         if (spflags & MGV7_FLOATLANDS) {
  88                 noise_floatland_base    = new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  89                 noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
  90         }
  91
  92         if (spflags & MGV7_RIDGES) {
  93                 noise_ridge_uwater = new Noise(&params->np_ridge_uwater, seed, csize.X, csize.Z);
  94         // 3D noise, 1-up 1-down overgeneration
  95                 noise_ridge = new Noise(&params->np_ridge, seed, csize.X, csize.Y + 2, csize.Z);
  96         }
  97         // 3D noise, 1 up, 1 down overgeneration
  98         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
  99                 noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
 100         // 3D noise, 1 down overgeneration
 101         MapgenBasic::np_cave1  = params->np_cave1;
 102         MapgenBasic::np_cave2  = params->np_cave2;
 103         MapgenBasic::np_cavern = params->np_cavern;
 104 }
 105
 106
 107 MapgenV7::~MapgenV7()
 108 {
 109         delete noise_terrain_base;
 110         delete noise_terrain_alt;
 111         delete noise_terrain_persist;
 112         delete noise_height_select;
 113         delete noise_filler_depth;
 114
 115         if (spflags & MGV7_MOUNTAINS)
 116                 delete noise_mount_height;
 117
 118         if (spflags & MGV7_FLOATLANDS) {
 119                 delete noise_floatland_base;
 120                 delete noise_float_base_height;
 121         }
 122
 123         if (spflags & MGV7_RIDGES) {
 124                 delete noise_ridge_uwater;
 125                 delete noise_ridge;
 126         }
 127
 128         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 129                 delete noise_mountain;
 130 }
 131
 132
 133 MapgenV7Params::MapgenV7Params():
 134         np_terrain_base      (4,    70,   v3f(600,  600,  600),  82341, 5, 0.6,  2.0),
 135         np_terrain_alt       (4,    25,   v3f(600,  600,  600),  5934,  5, 0.6,  2.0),
 136         np_terrain_persist   (0.6,  0.1,  v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0),
 137         np_height_select     (-8,   16,   v3f(500,  500,  500),  4213,  6, 0.7,  2.0),
 138         np_filler_depth      (0,    1.2,  v3f(150,  150,  150),  261,   3, 0.7,  2.0),
 139         np_mount_height      (256,  112,  v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0),
 140         np_ridge_uwater      (0,    1,    v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0),
 141         np_floatland_base    (-0.6, 1.5,  v3f(600,  600,  600),  114,   5, 0.6,  2.0),
 142         np_float_base_height (48,   24,   v3f(300,  300,  300),  907,   4, 0.7,  2.0),
 143         np_mountain          (-0.6, 1,    v3f(250,  350,  250),  5333,  5, 0.63, 2.0),
 144         np_ridge             (0,    1,    v3f(100,  100,  100),  6467,  4, 0.75, 2.0),
 145         np_cavern            (0,    1,    v3f(384,  128,  384),  723,   5, 0.63, 2.0),
 146         np_cave1             (0,    12,   v3f(61,   61,   61),   52534, 3, 0.5,  2.0),
 147         np_cave2             (0,    12,   v3f(67,   67,   67),   10325, 3, 0.5,  2.0)
 148 {
 149 }
 150
 151
 152 void MapgenV7Params::readParams(const Settings *settings)
 153 {
 154         settings->getFlagStrNoEx("mgv7_spflags",            spflags, flagdesc_mapgen_v7);
 155         settings->getS16NoEx("mgv7_mount_zero_level",       mount_zero_level);
 156         settings->getFloatNoEx("mgv7_cave_width",           cave_width);
 157         settings->getS16NoEx("mgv7_large_cave_depth",       large_cave_depth);
 158         settings->getS16NoEx("mgv7_lava_depth",             lava_depth);
 159         settings->getFloatNoEx("mgv7_float_mount_density",  float_mount_density);
 160         settings->getFloatNoEx("mgv7_float_mount_height",   float_mount_height);
 161         settings->getFloatNoEx("mgv7_float_mount_exponent", float_mount_exponent);
 162         settings->getS16NoEx("mgv7_floatland_level",        floatland_level);
 163         settings->getS16NoEx("mgv7_shadow_limit",           shadow_limit);
 164         settings->getS16NoEx("mgv7_cavern_limit",           cavern_limit);
 165         settings->getS16NoEx("mgv7_cavern_taper",           cavern_taper);
 166         settings->getFloatNoEx("mgv7_cavern_threshold",     cavern_threshold);
 167         settings->getS16NoEx("mgv7_dungeon_ymin",           dungeon_ymin);
 168         settings->getS16NoEx("mgv7_dungeon_ymax",           dungeon_ymax);
 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_floatland_base",    np_floatland_base);
 178         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 179         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 180         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 181         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 182         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 183         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 184 }
 185
 186
 187 void MapgenV7Params::writeParams(Settings *settings) const
 188 {
 189         settings->setFlagStr("mgv7_spflags",            spflags, flagdesc_mapgen_v7, U32_MAX);
 190         settings->setS16("mgv7_mount_zero_level",       mount_zero_level);
 191         settings->setFloat("mgv7_cave_width",           cave_width);
 192         settings->setS16("mgv7_large_cave_depth",       large_cave_depth);
 193         settings->setS16("mgv7_lava_depth",             lava_depth);
 194         settings->setFloat("mgv7_float_mount_density",  float_mount_density);
 195         settings->setFloat("mgv7_float_mount_height",   float_mount_height);
 196         settings->setFloat("mgv7_float_mount_exponent", float_mount_exponent);
 197         settings->setS16("mgv7_floatland_level",        floatland_level);
 198         settings->setS16("mgv7_shadow_limit",           shadow_limit);
 199         settings->setS16("mgv7_cavern_limit",           cavern_limit);
 200         settings->setS16("mgv7_cavern_taper",           cavern_taper);
 201         settings->setFloat("mgv7_cavern_threshold",     cavern_threshold);
 202         settings->setS16("mgv7_dungeon_ymin",           dungeon_ymin);
 203         settings->setS16("mgv7_dungeon_ymax",           dungeon_ymax);
 204
 205         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 206         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 207         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 208         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 209         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 210         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 211         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 212         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 213         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 214         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 215         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 216         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 217         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 218         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 219 }
 220
 221
 222 ///////////////////////////////////////////////////////////////////////////////
 223
 224
 225 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 226 {
 227         // If rivers are enabled, first check if in a river
 228         if (spflags & MGV7_RIDGES) {
 229                 float width = 0.2;
 230                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 231                 if (std::fabs(uwatern) <= width)
 232                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 233         }
 234
 235         // Terrain noise 'offset' is the average level of that terrain.
 236         // At least 50% of terrain will be below the higher of base and alt terrain
 237         // 'offset's.
 238         // Raising the maximum spawn level above 'water_level + 16' is necessary
 239         // for when terrain 'offset's are set much higher than water_level.
 240         s16 max_spawn_y = MYMAX(MYMAX(noise_terrain_alt->np.offset,
 241                         noise_terrain_base->np.offset),
 242                         water_level + 16);
 243         // Base terrain calculation
 244         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 245
 246         // If mountains are disabled, terrain level is base terrain level.
 247         // Avoids mid-air spawn where mountain terrain would have been.
 248         if (!(spflags & MGV7_MOUNTAINS)) {
 249                 if (y < water_level || y > max_spawn_y)
 250                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 251
 252                 // y + 2 because y is surface level and due to biome 'dust'
 253                 return y + 2;
 254         }
 255
 256         // Search upwards for first node without mountain terrain
 257         int iters = 256;
 258         while (iters > 0 && y <= max_spawn_y) {
 259                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {
 260                         if (y <= water_level || y > max_spawn_y)
 261                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 262
 263                         // y + 1 due to biome 'dust'
 264                         return y + 1;
 265                 }
 266                 y++;
 267                 iters--;
 268         }
 269
 270         // Unsuitable spawn point
 271         return MAX_MAP_GENERATION_LIMIT;
 272 }
 273
 274
 275 void MapgenV7::makeChunk(BlockMakeData *data)
 276 {
 277         // Pre-conditions
 278         assert(data->vmanip);
 279         assert(data->nodedef);
 280         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 281                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 282                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 283         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 284                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 285                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 286
 287         this->generating = true;
 288         this->vm   = data->vmanip;
 289         this->ndef = data->nodedef;
 290         //TimeTaker t("makeChunk");
 291
 292         v3s16 blockpos_min = data->blockpos_min;
 293         v3s16 blockpos_max = data->blockpos_max;
 294         node_min = blockpos_min * MAP_BLOCKSIZE;
 295         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 296         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 297         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 298
 299         blockseed = getBlockSeed2(full_node_min, seed);
 300
 301         // Generate base and mountain terrain
 302         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 303         s16 stone_surface_max_y = generateTerrain();
 304
 305         // Generate rivers
 306         if (spflags & MGV7_RIDGES)
 307                 generateRidgeTerrain();
 308
 309         // Create heightmap
 310         updateHeightmap(node_min, node_max);
 311
 312         // Init biome generator, place biome-specific nodes, and build biomemap
 313         biomegen->calcBiomeNoise(node_min);
 314         generateBiomes();
 315
 316         // Generate caverns, tunnels and classic caves
 317         if (flags & MG_CAVES) {
 318                 bool near_cavern = false;
 319                 // Generate caverns
 320                 if (spflags & MGV7_CAVERNS)
 321                         near_cavern = generateCaverns(stone_surface_max_y);
 322                 // Generate tunnels and classic caves
 323                 if (near_cavern)
 324                         // Disable classic caves in this mapchunk by setting
 325                         // 'large cave depth' to world base. Avoids excessive liquid in
 326                         // large caverns and floating blobs of overgenerated liquid.
 327                         generateCaves(stone_surface_max_y, -MAX_MAP_GENERATION_LIMIT);
 328                 else
 329                         generateCaves(stone_surface_max_y, large_cave_depth);
 330         }
 331
 332         // Generate dungeons
 333         if ((flags & MG_DUNGEONS) && full_node_min.Y >= dungeon_ymin &&
 334                         full_node_max.Y <= dungeon_ymax)
 335                 generateDungeons(stone_surface_max_y);
 336
 337         // Generate the registered decorations
 338         if (flags & MG_DECORATIONS)
 339                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 340
 341         // Generate the registered ores
 342         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 343
 344         // Sprinkle some dust on top after everything else was generated
 345         dustTopNodes();
 346
 347         //printf("makeChunk: %dms\n", t.stop());
 348
 349         // Update liquids
 350         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 351
 352         // Calculate lighting
 353         // Limit floatland shadow
 354         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 355                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 356
 357         if (flags & MG_LIGHT)
 358                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 359                         full_node_min, full_node_max, propagate_shadow);
 360
 361         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 362         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 363
 364         this->generating = false;
 365 }
 366
 367
 368 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 369 {
 370         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 371         hselect = rangelim(hselect, 0.0, 1.0);
 372
 373         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 374
 375         noise_terrain_base->np.persist = persist;
 376         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 377
 378         noise_terrain_alt->np.persist = persist;
 379         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 380
 381         if (height_alt > height_base)
 382                 return height_alt;
 383
 384         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 385 }
 386
 387
 388 float MapgenV7::baseTerrainLevelFromMap(int index)
 389 {
 390         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 391         float height_base = noise_terrain_base->result[index];
 392         float height_alt  = noise_terrain_alt->result[index];
 393
 394         if (height_alt > height_base)
 395                 return height_alt;
 396
 397         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 398 }
 399
 400
 401 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 402 {
 403         float mnt_h_n =
 404                         MYMAX(NoisePerlin2D(&noise_mount_height->np, x, z, seed), 1.0f);
 405         float density_gradient = -((float)(y - mount_zero_level) / mnt_h_n);
 406         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 407
 408         return mnt_n + density_gradient >= 0.0;
 409 }
 410
 411
 412 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 413 {
 414         float mounthn = MYMAX(noise_mount_height->result[idx_xz], 1.0f);
 415         float density_gradient = -((float)(y - mount_zero_level) / mounthn);
 416         float mountn = noise_mountain->result[idx_xyz];
 417
 418         return mountn + density_gradient >= 0.0;
 419 }
 420
 421
 422 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 423 {
 424         // Make rim 2 nodes thick to match floatland base terrain
 425         float density_gradient = (y >= floatland_level) ?
 426                 -std::pow((float)(y - floatland_level) / float_mount_height,
 427                 float_mount_exponent) :
 428                 -std::pow((float)(floatland_level - 1 - y) / float_mount_height,
 429                 float_mount_exponent);
 430
 431         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 432
 433         return floatn + density_gradient >= 0.0f;
 434 }
 435
 436
 437 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
 438 {
 439         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 440         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 441         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 442
 443         float n_base = noise_floatland_base->result[idx_xz];
 444         if (n_base > 0.0f) {
 445                 float n_base_height =
 446                                 MYMAX(noise_float_base_height->result[idx_xz], 1.0f);
 447                 float amp = n_base * n_base_height;
 448                 float ridge = n_base_height / 3.0f;
 449                 base_min = floatland_level - amp / 1.5f;
 450
 451                 if (amp > ridge * 2.0f) {
 452                         // Lake bed
 453                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 454                 } else {
 455                         // Hills and ridges
 456                         float diff = std::fabs(amp - ridge) / ridge;
 457                         // Smooth ridges using the 'smoothstep function'
 458                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 459                         base_max = floatland_level + ridge - smooth_diff * ridge;
 460                 }
 461         }
 462
 463         *float_base_min = base_min;
 464         *float_base_max = base_max;
 465 }
 466
 467
 468 int MapgenV7::generateTerrain()
 469 {
 470         MapNode n_air(CONTENT_AIR);
 471         MapNode n_stone(c_stone);
 472         MapNode n_water(c_water_source);
 473
 474         //// Calculate noise for terrain generation
 475         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 476         float *persistmap = noise_terrain_persist->result;
 477
 478         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 479         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 480         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 481
 482         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 483                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 484         }
 485
 486         if (spflags & MGV7_MOUNTAINS) {
 487                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 488         }
 489
 490         if (spflags & MGV7_FLOATLANDS) {
 491                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 492                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 493         }
 494
 495         //// Place nodes
 496         const v3s16 &em = vm->m_area.getExtent();
 497         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 498         u32 index2d = 0;
 499
 500         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 501         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 502                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 503                 if (surface_y > stone_surface_max_y)
 504                         stone_surface_max_y = surface_y;
 505
 506                 // Get extent of floatland base terrain
 507                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 508                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 509                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 510                 if (spflags & MGV7_FLOATLANDS)
 511                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 512
 513                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 514                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 515
 516                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 517                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 518                                 if (y <= surface_y) {
 519                                         vm->m_data[vi] = n_stone;  // Base terrain
 520                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 521                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 522                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 523                                         if (y > stone_surface_max_y)
 524                                                 stone_surface_max_y = y;
 525                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 526                                                 ((y >= float_base_min && y <= float_base_max) ||
 527                                                 getFloatlandMountainFromMap(index3d, index2d, y))) {
 528                                         vm->m_data[vi] = n_stone;  // Floatland terrain
 529                                         stone_surface_max_y = node_max.Y;
 530                                 } else if (y <= water_level) {
 531                                         vm->m_data[vi] = n_water;  // Ground level water
 532                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 533                                                 (y >= float_base_max && y <= floatland_level)) {
 534                                         vm->m_data[vi] = n_water;  // Floatland water
 535                                 } else {
 536                                         vm->m_data[vi] = n_air;
 537                                 }
 538                         }
 539                         VoxelArea::add_y(em, vi, 1);
 540                         index3d += ystride;
 541                 }
 542         }
 543
 544         return stone_surface_max_y;
 545 }
 546
 547
 548 void MapgenV7::generateRidgeTerrain()
 549 {
 550         if (node_max.Y < water_level - 16 ||
 551                         ((spflags & MGV7_FLOATLANDS) && node_max.Y > shadow_limit))
 552                 return;
 553
 554         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 555         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 556
 557         MapNode n_water(c_water_source);
 558         MapNode n_air(CONTENT_AIR);
 559         u32 index = 0;
 560         float width = 0.2;
 561
 562         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 563         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 564                 u32 vi = vm->m_area.index(node_min.X, y, z);
 565                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 566                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 567
 568                         float uwatern = noise_ridge_uwater->result[j] * 2;
 569                         if (std::fabs(uwatern) > width)
 570                                 continue;
 571
 572                         float altitude = y - water_level;
 573                         float height_mod = (altitude + 17) / 2.5;
 574                         float width_mod  = width - std::fabs(uwatern);
 575                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 576
 577                         if (nridge + width_mod * height_mod < 0.6)
 578                                 continue;
 579
 580                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 581                 }
 582         }
 583 }