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 "profiler.h" // For TimeTaker
  33 #include "settings.h" // For g_settings
  34 #include "emerge.h"
  35 #include "dungeongen.h"
  36 #include "cavegen.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         {"floatlands",  MGV7_FLOATLANDS},
  47         {"caverns",     MGV7_CAVERNS},
  48         {NULL,          0}
  49 };
  50
  51
  52 ////////////////////////////////////////////////////////////////////////////////
  53
  54
  55 MapgenV7::MapgenV7(MapgenV7Params *params, EmergeManager *emerge)
  56         : MapgenBasic(MAPGEN_V7, params, emerge)
  57 {
  58         spflags              = params->spflags;
  59         mount_zero_level     = params->mount_zero_level;
  60         float_mount_density  = params->float_mount_density;
  61         float_mount_exponent = params->float_mount_exponent;
  62         floatland_level      = params->floatland_level;
  63         shadow_limit         = params->shadow_limit;
  64
  65         cave_width           = params->cave_width;
  66         large_cave_depth     = params->large_cave_depth;
  67         lava_depth           = params->lava_depth;
  68         cavern_limit         = params->cavern_limit;
  69         cavern_taper         = params->cavern_taper;
  70         cavern_threshold     = params->cavern_threshold;
  71         dungeon_ymin         = params->dungeon_ymin;
  72         dungeon_ymax         = params->dungeon_ymax;
  73
  74         // This is to avoid a divide-by-zero.
  75         // Parameter will be saved to map_meta.txt in limited form.
  76         params->float_mount_height = std::fmax(params->float_mount_height, 1.0f);
  77         float_mount_height   = params->float_mount_height;
  78
  79         // 2D noise
  80         noise_terrain_base =
  81                 new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  82         noise_terrain_alt =
  83                 new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  84         noise_terrain_persist =
  85                 new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  86         noise_height_select =
  87                 new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  88         noise_filler_depth =
  89                 new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  90
  91         if (spflags & MGV7_MOUNTAINS)
  92                 noise_mount_height =
  93                         new Noise(&params->np_mount_height,      seed, csize.X, csize.Z);
  94
  95         if (spflags & MGV7_FLOATLANDS) {
  96                 noise_floatland_base =
  97                         new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  98                 noise_float_base_height =
  99                         new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
 100         }
 101
 102         if (spflags & MGV7_RIDGES) {
 103                 noise_ridge_uwater =
 104                         new Noise(&params->np_ridge_uwater,      seed, csize.X, csize.Z);
 105         // 3D noise, 1 up, 1 down overgeneration
 106                 noise_ridge =
 107                         new Noise(&params->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
 108         }
 109
 110         // 3D noise, 1 up, 1 down overgeneration
 111         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 112                 noise_mountain =
 113                         new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
 114
 115         // 3D noise, 1 down overgeneration
 116         MapgenBasic::np_cave1  = params->np_cave1;
 117         MapgenBasic::np_cave2  = params->np_cave2;
 118         MapgenBasic::np_cavern = params->np_cavern;
 119 }
 120
 121
 122 MapgenV7::~MapgenV7()
 123 {
 124         delete noise_terrain_base;
 125         delete noise_terrain_alt;
 126         delete noise_terrain_persist;
 127         delete noise_height_select;
 128         delete noise_filler_depth;
 129
 130         if (spflags & MGV7_MOUNTAINS)
 131                 delete noise_mount_height;
 132
 133         if (spflags & MGV7_FLOATLANDS) {
 134                 delete noise_floatland_base;
 135                 delete noise_float_base_height;
 136         }
 137
 138         if (spflags & MGV7_RIDGES) {
 139                 delete noise_ridge_uwater;
 140                 delete noise_ridge;
 141         }
 142
 143         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 144                 delete noise_mountain;
 145 }
 146
 147
 148 MapgenV7Params::MapgenV7Params():
 149         np_terrain_base      (4.0,   70.0,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0),
 150         np_terrain_alt       (4.0,   25.0,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0),
 151         np_terrain_persist   (0.6,   0.1,   v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0),
 152         np_height_select     (-8.0,  16.0,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0),
 153         np_filler_depth      (0.0,   1.2,   v3f(150,  150,  150),  261,   3, 0.7,  2.0),
 154         np_mount_height      (256.0, 112.0, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0),
 155         np_ridge_uwater      (0.0,   1.0,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0),
 156         np_floatland_base    (-0.6,  1.5,   v3f(600,  600,  600),  114,   5, 0.6,  2.0),
 157         np_float_base_height (48.0,  24.0,  v3f(300,  300,  300),  907,   4, 0.7,  2.0),
 158         np_mountain          (-0.6,  1.0,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0),
 159         np_ridge             (0.0,   1.0,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0),
 160         np_cavern            (0.0,   1.0,   v3f(384,  128,  384),  723,   5, 0.63, 2.0),
 161         np_cave1             (0.0,   12.0,  v3f(61,   61,   61),   52534, 3, 0.5,  2.0),
 162         np_cave2             (0.0,   12.0,  v3f(67,   67,   67),   10325, 3, 0.5,  2.0)
 163 {
 164 }
 165
 166
 167 void MapgenV7Params::readParams(const Settings *settings)
 168 {
 169         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 170         settings->getS16NoEx("mgv7_mount_zero_level",       mount_zero_level);
 171         settings->getFloatNoEx("mgv7_cave_width",           cave_width);
 172         settings->getS16NoEx("mgv7_large_cave_depth",       large_cave_depth);
 173         settings->getS16NoEx("mgv7_lava_depth",             lava_depth);
 174         settings->getFloatNoEx("mgv7_float_mount_density",  float_mount_density);
 175         settings->getFloatNoEx("mgv7_float_mount_height",   float_mount_height);
 176         settings->getFloatNoEx("mgv7_float_mount_exponent", float_mount_exponent);
 177         settings->getS16NoEx("mgv7_floatland_level",        floatland_level);
 178         settings->getS16NoEx("mgv7_shadow_limit",           shadow_limit);
 179         settings->getS16NoEx("mgv7_cavern_limit",           cavern_limit);
 180         settings->getS16NoEx("mgv7_cavern_taper",           cavern_taper);
 181         settings->getFloatNoEx("mgv7_cavern_threshold",     cavern_threshold);
 182         settings->getS16NoEx("mgv7_dungeon_ymin",           dungeon_ymin);
 183         settings->getS16NoEx("mgv7_dungeon_ymax",           dungeon_ymax);
 184
 185         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 186         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 187         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 188         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 189         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 190         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 191         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 192         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 193         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 194         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 195         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 196         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 197         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 198         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 199 }
 200
 201
 202 void MapgenV7Params::writeParams(Settings *settings) const
 203 {
 204         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, U32_MAX);
 205         settings->setS16("mgv7_mount_zero_level",       mount_zero_level);
 206         settings->setFloat("mgv7_cave_width",           cave_width);
 207         settings->setS16("mgv7_large_cave_depth",       large_cave_depth);
 208         settings->setS16("mgv7_lava_depth",             lava_depth);
 209         settings->setFloat("mgv7_float_mount_density",  float_mount_density);
 210         settings->setFloat("mgv7_float_mount_height",   float_mount_height);
 211         settings->setFloat("mgv7_float_mount_exponent", float_mount_exponent);
 212         settings->setS16("mgv7_floatland_level",        floatland_level);
 213         settings->setS16("mgv7_shadow_limit",           shadow_limit);
 214         settings->setS16("mgv7_cavern_limit",           cavern_limit);
 215         settings->setS16("mgv7_cavern_taper",           cavern_taper);
 216         settings->setFloat("mgv7_cavern_threshold",     cavern_threshold);
 217         settings->setS16("mgv7_dungeon_ymin",           dungeon_ymin);
 218         settings->setS16("mgv7_dungeon_ymax",           dungeon_ymax);
 219
 220         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 221         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 222         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 223         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 224         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 225         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 226         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 227         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 228         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 229         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 230         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 231         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 232         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 233         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 234 }
 235
 236
 237 ////////////////////////////////////////////////////////////////////////////////
 238
 239
 240 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 241 {
 242         // If rivers are enabled, first check if in a river
 243         if (spflags & MGV7_RIDGES) {
 244                 float width = 0.2f;
 245                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) *
 246                         2.0f;
 247                 if (std::fabs(uwatern) <= width)
 248                         return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
 249         }
 250
 251         // Terrain noise 'offset' is the average level of that terrain.
 252         // At least 50% of terrain will be below the higher of base and alt terrain
 253         // 'offset's.
 254         // Raising the maximum spawn level above 'water_level + 16' is necessary
 255         // for when terrain 'offset's are set much higher than water_level.
 256         s16 max_spawn_y = std::fmax(std::fmax(noise_terrain_alt->np.offset,
 257                         noise_terrain_base->np.offset),
 258                         water_level + 16);
 259         // Base terrain calculation
 260         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 261
 262         // If mountains are disabled, terrain level is base terrain level.
 263         // Avoids mid-air spawn where mountain terrain would have been.
 264         if (!(spflags & MGV7_MOUNTAINS)) {
 265                 if (y < water_level || y > max_spawn_y)
 266                         return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
 267
 268                 // y + 2 because y is surface level and due to biome 'dust'
 269                 return y + 2;
 270         }
 271
 272         // Search upwards for first node without mountain terrain
 273         int iters = 256;
 274         while (iters > 0 && y <= max_spawn_y) {
 275                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {
 276                         if (y <= water_level || y > max_spawn_y)
 277                                 return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
 278
 279                         // y + 1 due to biome 'dust'
 280                         return y + 1;
 281                 }
 282                 y++;
 283                 iters--;
 284         }
 285
 286         // Unsuitable spawn point
 287         return MAX_MAP_GENERATION_LIMIT;
 288 }
 289
 290
 291 void MapgenV7::makeChunk(BlockMakeData *data)
 292 {
 293         // Pre-conditions
 294         assert(data->vmanip);
 295         assert(data->nodedef);
 296         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 297                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 298                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 299         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 300                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 301                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 302
 303         //TimeTaker t("makeChunk");
 304
 305         this->generating = true;
 306         this->vm = data->vmanip;
 307         this->ndef = data->nodedef;
 308
 309         v3s16 blockpos_min = data->blockpos_min;
 310         v3s16 blockpos_max = data->blockpos_max;
 311         node_min = blockpos_min * MAP_BLOCKSIZE;
 312         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 313         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 314         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 315
 316         blockseed = getBlockSeed2(full_node_min, seed);
 317
 318         // Generate base and mountain terrain
 319         s16 stone_surface_max_y = generateTerrain();
 320
 321         // Generate rivers
 322         if (spflags & MGV7_RIDGES)
 323                 generateRidgeTerrain();
 324
 325         // Create heightmap
 326         updateHeightmap(node_min, node_max);
 327
 328         // Init biome generator, place biome-specific nodes, and build biomemap
 329         if (flags & MG_BIOMES) {
 330                 biomegen->calcBiomeNoise(node_min);
 331                 generateBiomes();
 332         }
 333
 334         // Generate tunnels, caverns and large randomwalk caves
 335         if (flags & MG_CAVES) {
 336                 // Generate tunnels first as caverns confuse them
 337                 generateCavesNoiseIntersection(stone_surface_max_y);
 338
 339                 // Generate caverns
 340                 bool near_cavern = false;
 341                 if (spflags & MGV7_CAVERNS)
 342                         near_cavern = generateCavernsNoise(stone_surface_max_y);
 343
 344                 // Generate large randomwalk caves
 345                 if (near_cavern)
 346                         // Disable large randomwalk caves in this mapchunk by setting
 347                         // 'large cave depth' to world base. Avoids excessive liquid in
 348                         // large caverns and floating blobs of overgenerated liquid.
 349                         generateCavesRandomWalk(stone_surface_max_y,
 350                                 -MAX_MAP_GENERATION_LIMIT);
 351                 else
 352                         generateCavesRandomWalk(stone_surface_max_y, large_cave_depth);
 353         }
 354
 355         // Generate the registered ores
 356         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 357
 358         // Generate dungeons
 359         if ((flags & MG_DUNGEONS) && full_node_min.Y >= dungeon_ymin &&
 360                         full_node_max.Y <= dungeon_ymax)
 361                 generateDungeons(stone_surface_max_y);
 362
 363         // Generate the registered decorations
 364         if (flags & MG_DECORATIONS)
 365                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 366
 367         // Sprinkle some dust on top after everything else was generated
 368         if (flags & MG_BIOMES)
 369                 dustTopNodes();
 370
 371         // Update liquids
 372         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 373
 374         // Calculate lighting.
 375         // Limit floatland shadow.
 376         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 377                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 378
 379         if (flags & MG_LIGHT)
 380                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 381                         full_node_min, full_node_max, propagate_shadow);
 382
 383         this->generating = false;
 384
 385         //printf("makeChunk: %lums\n", t.stop());
 386 }
 387
 388
 389 ////////////////////////////////////////////////////////////////////////////////
 390
 391
 392 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 393 {
 394         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 395         hselect = rangelim(hselect, 0.0f, 1.0f);
 396
 397         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 398
 399         noise_terrain_base->np.persist = persist;
 400         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 401
 402         noise_terrain_alt->np.persist = persist;
 403         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 404
 405         if (height_alt > height_base)
 406                 return height_alt;
 407
 408         return (height_base * hselect) + (height_alt * (1.0f - hselect));
 409 }
 410
 411
 412 float MapgenV7::baseTerrainLevelFromMap(int index)
 413 {
 414         float hselect = rangelim(noise_height_select->result[index], 0.0f, 1.0f);
 415         float height_base = noise_terrain_base->result[index];
 416         float height_alt = noise_terrain_alt->result[index];
 417
 418         if (height_alt > height_base)
 419                 return height_alt;
 420
 421         return (height_base * hselect) + (height_alt * (1.0f - hselect));
 422 }
 423
 424
 425 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 426 {
 427         float mnt_h_n =
 428                 std::fmax(NoisePerlin2D(&noise_mount_height->np, x, z, seed), 1.0f);
 429         float density_gradient = -((float)(y - mount_zero_level) / mnt_h_n);
 430         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 431
 432         return mnt_n + density_gradient >= 0.0f;
 433 }
 434
 435
 436 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 437 {
 438         float mounthn = std::fmax(noise_mount_height->result[idx_xz], 1.0f);
 439         float density_gradient = -((float)(y - mount_zero_level) / mounthn);
 440         float mountn = noise_mountain->result[idx_xyz];
 441
 442         return mountn + density_gradient >= 0.0f;
 443 }
 444
 445
 446 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 447 {
 448         // Make rim 2 nodes thick to match floatland base terrain
 449         float density_gradient = (y >= floatland_level) ?
 450                 -std::pow((float)(y - floatland_level) / float_mount_height,
 451                 float_mount_exponent) :
 452                 -std::pow((float)(floatland_level - 1 - y) / float_mount_height,
 453                 float_mount_exponent);
 454
 455         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 456
 457         return floatn + density_gradient >= 0.0f;
 458 }
 459
 460
 461 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max,
 462         int idx_xz)
 463 {
 464         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 465         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 466         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 467
 468         float n_base = noise_floatland_base->result[idx_xz];
 469         if (n_base > 0.0f) {
 470                 float n_base_height =
 471                                 std::fmax(noise_float_base_height->result[idx_xz], 1.0f);
 472                 float amp = n_base * n_base_height;
 473                 float ridge = n_base_height / 3.0f;
 474                 base_min = floatland_level - amp / 1.5f;
 475
 476                 if (amp > ridge * 2.0f) {
 477                         // Lake bed
 478                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 479                 } else {
 480                         // Hills and ridges
 481                         float diff = std::fabs(amp - ridge) / ridge;
 482                         // Smooth ridges using the 'smoothstep function'
 483                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 484                         base_max = floatland_level + ridge - smooth_diff * ridge;
 485                 }
 486         }
 487
 488         *float_base_min = base_min;
 489         *float_base_max = base_max;
 490 }
 491
 492
 493 int MapgenV7::generateTerrain()
 494 {
 495         MapNode n_air(CONTENT_AIR);
 496         MapNode n_stone(c_stone);
 497         MapNode n_water(c_water_source);
 498
 499         //// Calculate noise for terrain generation
 500         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 501         float *persistmap = noise_terrain_persist->result;
 502
 503         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 504         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 505         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 506
 507         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 508                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 509         }
 510
 511         if (spflags & MGV7_MOUNTAINS) {
 512                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 513         }
 514
 515         if (spflags & MGV7_FLOATLANDS) {
 516                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 517                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 518         }
 519
 520         //// Place nodes
 521         const v3s16 &em = vm->m_area.getExtent();
 522         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 523         u32 index2d = 0;
 524
 525         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 526         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 527                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 528                 if (surface_y > stone_surface_max_y)
 529                         stone_surface_max_y = surface_y;
 530
 531                 // Get extent of floatland base terrain
 532                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 533                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 534                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 535                 if (spflags & MGV7_FLOATLANDS)
 536                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 537
 538                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 539                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 540
 541                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1;
 542                                 y++,
 543                                 index3d += ystride,
 544                                 VoxelArea::add_y(em, vi, 1)) {
 545                         if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
 546                                 continue;
 547
 548                         if (y <= surface_y) {
 549                                 vm->m_data[vi] = n_stone; // Base terrain
 550                         } else if ((spflags & MGV7_MOUNTAINS) &&
 551                                         getMountainTerrainFromMap(index3d, index2d, y)) {
 552                                 vm->m_data[vi] = n_stone; // Mountain terrain
 553                                 if (y > stone_surface_max_y)
 554                                         stone_surface_max_y = y;
 555                         } else if ((spflags & MGV7_FLOATLANDS) &&
 556                                         ((y >= float_base_min && y <= float_base_max) ||
 557                                         getFloatlandMountainFromMap(index3d, index2d, y))) {
 558                                 vm->m_data[vi] = n_stone; // Floatland terrain
 559                                 stone_surface_max_y = node_max.Y;
 560                         } else if (y <= water_level) {
 561                                 vm->m_data[vi] = n_water; // Ground level water
 562                         } else if ((spflags & MGV7_FLOATLANDS) &&
 563                                         (y >= float_base_max && y <= floatland_level)) {
 564                                 vm->m_data[vi] = n_water; // Floatland water
 565                         } else {
 566                                 vm->m_data[vi] = n_air;
 567                         }
 568                 }
 569         }
 570
 571         return stone_surface_max_y;
 572 }
 573
 574
 575 void MapgenV7::generateRidgeTerrain()
 576 {
 577         if (node_max.Y < water_level - 16 ||
 578                         ((spflags & MGV7_FLOATLANDS) && node_max.Y > shadow_limit))
 579                 return;
 580
 581         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 582         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 583
 584         MapNode n_water(c_water_source);
 585         MapNode n_air(CONTENT_AIR);
 586         u32 index3d = 0;
 587         float width = 0.2f;
 588
 589         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 590         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 591                 u32 vi = vm->m_area.index(node_min.X, y, z);
 592                 for (s16 x = node_min.X; x <= node_max.X; x++, index3d++, vi++) {
 593                         u32 index2d = (z - node_min.Z) * csize.X + (x - node_min.X);
 594                         float uwatern = noise_ridge_uwater->result[index2d] * 2.0f;
 595                         if (std::fabs(uwatern) > width)
 596                                 continue;
 597                         // Optimises, but also avoids removing nodes placed by mods in
 598                         // 'on-generated', when generating outside mapchunk.
 599                         content_t c = vm->m_data[vi].getContent();
 600                         if (c != c_stone)
 601                                 continue;
 602
 603                         float altitude = y - water_level;
 604                         float height_mod = (altitude + 17.0f) / 2.5f;
 605                         float width_mod = width - std::fabs(uwatern);
 606                         float nridge = noise_ridge->result[index3d] *
 607                                 std::fmax(altitude, 0.0f) / 7.0f;
 608                         if (nridge + width_mod * height_mod < 0.6f)
 609                                 continue;
 610
 611                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 612                 }
 613         }
 614 }