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         small_cave_num_min = params->small_cave_num_min;
  69         small_cave_num_max = params->small_cave_num_max;
  70         large_cave_num_min = params->large_cave_num_min;
  71         large_cave_num_max = params->large_cave_num_max;
  72         large_cave_flooded = params->large_cave_flooded;
  73         cavern_limit       = params->cavern_limit;
  74         cavern_taper       = params->cavern_taper;
  75         cavern_threshold   = params->cavern_threshold;
  76         dungeon_ymin       = params->dungeon_ymin;
  77         dungeon_ymax       = params->dungeon_ymax;
  78
  79         // This is to avoid a divide-by-zero.
  80         // Parameter will be saved to map_meta.txt in limited form.
  81         params->float_mount_height = std::fmax(params->float_mount_height, 1.0f);
  82         float_mount_height   = params->float_mount_height;
  83
  84         // 2D noise
  85         noise_terrain_base =
  86                 new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  87         noise_terrain_alt =
  88                 new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  89         noise_terrain_persist =
  90                 new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  91         noise_height_select =
  92                 new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  93         noise_filler_depth =
  94                 new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  95
  96         if (spflags & MGV7_MOUNTAINS)
  97                 noise_mount_height =
  98                         new Noise(&params->np_mount_height,      seed, csize.X, csize.Z);
  99
 100         if (spflags & MGV7_FLOATLANDS) {
 101                 noise_floatland_base =
 102                         new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
 103                 noise_float_base_height =
 104                         new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
 105         }
 106
 107         if (spflags & MGV7_RIDGES) {
 108                 noise_ridge_uwater =
 109                         new Noise(&params->np_ridge_uwater,      seed, csize.X, csize.Z);
 110         // 3D noise, 1 up, 1 down overgeneration
 111                 noise_ridge =
 112                         new Noise(&params->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
 113         }
 114
 115         // 3D noise, 1 up, 1 down overgeneration
 116         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 117                 noise_mountain =
 118                         new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
 119
 120         // 3D noise, 1 down overgeneration
 121         MapgenBasic::np_cave1    = params->np_cave1;
 122         MapgenBasic::np_cave2    = params->np_cave2;
 123         MapgenBasic::np_cavern   = params->np_cavern;
 124         MapgenBasic::np_dungeons = params->np_dungeons;
 125 }
 126
 127
 128 MapgenV7::~MapgenV7()
 129 {
 130         delete noise_terrain_base;
 131         delete noise_terrain_alt;
 132         delete noise_terrain_persist;
 133         delete noise_height_select;
 134         delete noise_filler_depth;
 135
 136         if (spflags & MGV7_MOUNTAINS)
 137                 delete noise_mount_height;
 138
 139         if (spflags & MGV7_FLOATLANDS) {
 140                 delete noise_floatland_base;
 141                 delete noise_float_base_height;
 142         }
 143
 144         if (spflags & MGV7_RIDGES) {
 145                 delete noise_ridge_uwater;
 146                 delete noise_ridge;
 147         }
 148
 149         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 150                 delete noise_mountain;
 151 }
 152
 153
 154 MapgenV7Params::MapgenV7Params():
 155         np_terrain_base      (4.0,   70.0,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0),
 156         np_terrain_alt       (4.0,   25.0,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0),
 157         np_terrain_persist   (0.6,   0.1,   v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0),
 158         np_height_select     (-8.0,  16.0,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0),
 159         np_filler_depth      (0.0,   1.2,   v3f(150,  150,  150),  261,   3, 0.7,  2.0),
 160         np_mount_height      (256.0, 112.0, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0),
 161         np_ridge_uwater      (0.0,   1.0,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0),
 162         np_floatland_base    (-0.6,  1.5,   v3f(600,  600,  600),  114,   5, 0.6,  2.0),
 163         np_float_base_height (48.0,  24.0,  v3f(300,  300,  300),  907,   4, 0.7,  2.0),
 164         np_mountain          (-0.6,  1.0,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0),
 165         np_ridge             (0.0,   1.0,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0),
 166         np_cavern            (0.0,   1.0,   v3f(384,  128,  384),  723,   5, 0.63, 2.0),
 167         np_cave1             (0.0,   12.0,  v3f(61,   61,   61),   52534, 3, 0.5,  2.0),
 168         np_cave2             (0.0,   12.0,  v3f(67,   67,   67),   10325, 3, 0.5,  2.0),
 169         np_dungeons          (0.9,   0.5,   v3f(500,  500,  500),  0,     2, 0.8,  2.0)
 170 {
 171 }
 172
 173
 174 void MapgenV7Params::readParams(const Settings *settings)
 175 {
 176         settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
 177         settings->getS16NoEx("mgv7_mount_zero_level",       mount_zero_level);
 178         settings->getFloatNoEx("mgv7_cave_width",           cave_width);
 179         settings->getS16NoEx("mgv7_large_cave_depth",       large_cave_depth);
 180         settings->getS16NoEx("mgv7_lava_depth",             lava_depth);
 181         settings->getU16NoEx("mgv7_small_cave_num_min",     small_cave_num_min);
 182         settings->getU16NoEx("mgv7_small_cave_num_max",     small_cave_num_max);
 183         settings->getU16NoEx("mgv7_large_cave_num_min",     large_cave_num_min);
 184         settings->getU16NoEx("mgv7_large_cave_num_max",     large_cave_num_max);
 185         settings->getFloatNoEx("mgv7_large_cave_flooded",   large_cave_flooded);
 186         settings->getFloatNoEx("mgv7_float_mount_density",  float_mount_density);
 187         settings->getFloatNoEx("mgv7_float_mount_height",   float_mount_height);
 188         settings->getFloatNoEx("mgv7_float_mount_exponent", float_mount_exponent);
 189         settings->getS16NoEx("mgv7_floatland_level",        floatland_level);
 190         settings->getS16NoEx("mgv7_shadow_limit",           shadow_limit);
 191         settings->getS16NoEx("mgv7_cavern_limit",           cavern_limit);
 192         settings->getS16NoEx("mgv7_cavern_taper",           cavern_taper);
 193         settings->getFloatNoEx("mgv7_cavern_threshold",     cavern_threshold);
 194         settings->getS16NoEx("mgv7_dungeon_ymin",           dungeon_ymin);
 195         settings->getS16NoEx("mgv7_dungeon_ymax",           dungeon_ymax);
 196
 197         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 198         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 199         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 200         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 201         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 202         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 203         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 204         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 205         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 206         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 207         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 208         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 209         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 210         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 211         settings->getNoiseParams("mgv7_np_dungeons",          np_dungeons);
 212 }
 213
 214
 215 void MapgenV7Params::writeParams(Settings *settings) const
 216 {
 217         settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, U32_MAX);
 218         settings->setS16("mgv7_mount_zero_level",       mount_zero_level);
 219         settings->setFloat("mgv7_cave_width",           cave_width);
 220         settings->setS16("mgv7_large_cave_depth",       large_cave_depth);
 221         settings->setS16("mgv7_lava_depth",             lava_depth);
 222         settings->setU16("mgv7_small_cave_num_min",     small_cave_num_min);
 223         settings->setU16("mgv7_small_cave_num_max",     small_cave_num_max);
 224         settings->setU16("mgv7_large_cave_num_min",     large_cave_num_min);
 225         settings->setU16("mgv7_large_cave_num_max",     large_cave_num_max);
 226         settings->setFloat("mgv7_large_cave_flooded",   large_cave_flooded);
 227         settings->setFloat("mgv7_float_mount_density",  float_mount_density);
 228         settings->setFloat("mgv7_float_mount_height",   float_mount_height);
 229         settings->setFloat("mgv7_float_mount_exponent", float_mount_exponent);
 230         settings->setS16("mgv7_floatland_level",        floatland_level);
 231         settings->setS16("mgv7_shadow_limit",           shadow_limit);
 232         settings->setS16("mgv7_cavern_limit",           cavern_limit);
 233         settings->setS16("mgv7_cavern_taper",           cavern_taper);
 234         settings->setFloat("mgv7_cavern_threshold",     cavern_threshold);
 235         settings->setS16("mgv7_dungeon_ymin",           dungeon_ymin);
 236         settings->setS16("mgv7_dungeon_ymax",           dungeon_ymax);
 237
 238         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 239         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 240         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 241         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 242         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 243         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 244         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 245         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 246         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 247         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 248         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 249         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 250         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 251         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 252         settings->setNoiseParams("mgv7_np_dungeons",          np_dungeons);
 253 }
 254
 255
 256 ////////////////////////////////////////////////////////////////////////////////
 257
 258
 259 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 260 {
 261         // If rivers are enabled, first check if in a river
 262         if (spflags & MGV7_RIDGES) {
 263                 float width = 0.2f;
 264                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) *
 265                         2.0f;
 266                 if (std::fabs(uwatern) <= width)
 267                         return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
 268         }
 269
 270         // Terrain noise 'offset' is the average level of that terrain.
 271         // At least 50% of terrain will be below the higher of base and alt terrain
 272         // 'offset's.
 273         // Raising the maximum spawn level above 'water_level + 16' is necessary
 274         // for when terrain 'offset's are set much higher than water_level.
 275         s16 max_spawn_y = std::fmax(std::fmax(noise_terrain_alt->np.offset,
 276                         noise_terrain_base->np.offset),
 277                         water_level + 16);
 278         // Base terrain calculation
 279         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 280
 281         // If mountains are disabled, terrain level is base terrain level.
 282         // Avoids mid-air spawn where mountain terrain would have been.
 283         if (!(spflags & MGV7_MOUNTAINS)) {
 284                 if (y < water_level || y > max_spawn_y)
 285                         return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
 286
 287                 // y + 2 because y is surface level and due to biome 'dust'
 288                 return y + 2;
 289         }
 290
 291         // Search upwards for first node without mountain terrain
 292         int iters = 256;
 293         while (iters > 0 && y <= max_spawn_y) {
 294                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {
 295                         if (y <= water_level || y > max_spawn_y)
 296                                 return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
 297
 298                         // y + 1 due to biome 'dust'
 299                         return y + 1;
 300                 }
 301                 y++;
 302                 iters--;
 303         }
 304
 305         // Unsuitable spawn point
 306         return MAX_MAP_GENERATION_LIMIT;
 307 }
 308
 309
 310 void MapgenV7::makeChunk(BlockMakeData *data)
 311 {
 312         // Pre-conditions
 313         assert(data->vmanip);
 314         assert(data->nodedef);
 315         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 316                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 317                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 318         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 319                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 320                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 321
 322         //TimeTaker t("makeChunk");
 323
 324         this->generating = true;
 325         this->vm = data->vmanip;
 326         this->ndef = data->nodedef;
 327
 328         v3s16 blockpos_min = data->blockpos_min;
 329         v3s16 blockpos_max = data->blockpos_max;
 330         node_min = blockpos_min * MAP_BLOCKSIZE;
 331         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 332         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 333         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 334
 335         blockseed = getBlockSeed2(full_node_min, seed);
 336
 337         // Generate base and mountain terrain
 338         s16 stone_surface_max_y = generateTerrain();
 339
 340         // Generate rivers
 341         if (spflags & MGV7_RIDGES)
 342                 generateRidgeTerrain();
 343
 344         // Create heightmap
 345         updateHeightmap(node_min, node_max);
 346
 347         // Init biome generator, place biome-specific nodes, and build biomemap
 348         if (flags & MG_BIOMES) {
 349                 biomegen->calcBiomeNoise(node_min);
 350                 generateBiomes();
 351         }
 352
 353         // Generate tunnels, caverns and large randomwalk caves
 354         if (flags & MG_CAVES) {
 355                 // Generate tunnels first as caverns confuse them
 356                 generateCavesNoiseIntersection(stone_surface_max_y);
 357
 358                 // Generate caverns
 359                 bool near_cavern = false;
 360                 if (spflags & MGV7_CAVERNS)
 361                         near_cavern = generateCavernsNoise(stone_surface_max_y);
 362
 363                 // Generate large randomwalk caves
 364                 if (near_cavern)
 365                         // Disable large randomwalk caves in this mapchunk by setting
 366                         // 'large cave depth' to world base. Avoids excessive liquid in
 367                         // large caverns and floating blobs of overgenerated liquid.
 368                         generateCavesRandomWalk(stone_surface_max_y,
 369                                 -MAX_MAP_GENERATION_LIMIT);
 370                 else
 371                         generateCavesRandomWalk(stone_surface_max_y, large_cave_depth);
 372         }
 373
 374         // Generate the registered ores
 375         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 376
 377         // Generate dungeons
 378         if ((flags & MG_DUNGEONS) && full_node_min.Y >= dungeon_ymin &&
 379                         full_node_max.Y <= dungeon_ymax)
 380                 generateDungeons(stone_surface_max_y);
 381
 382         // Generate the registered decorations
 383         if (flags & MG_DECORATIONS)
 384                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 385
 386         // Sprinkle some dust on top after everything else was generated
 387         if (flags & MG_BIOMES)
 388                 dustTopNodes();
 389
 390         // Update liquids
 391         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 392
 393         // Calculate lighting.
 394         // Limit floatland shadow.
 395         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 396                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 397
 398         if (flags & MG_LIGHT)
 399                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 400                         full_node_min, full_node_max, propagate_shadow);
 401
 402         this->generating = false;
 403
 404         //printf("makeChunk: %lums\n", t.stop());
 405 }
 406
 407
 408 ////////////////////////////////////////////////////////////////////////////////
 409
 410
 411 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 412 {
 413         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 414         hselect = rangelim(hselect, 0.0f, 1.0f);
 415
 416         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 417
 418         noise_terrain_base->np.persist = persist;
 419         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 420
 421         noise_terrain_alt->np.persist = persist;
 422         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 423
 424         if (height_alt > height_base)
 425                 return height_alt;
 426
 427         return (height_base * hselect) + (height_alt * (1.0f - hselect));
 428 }
 429
 430
 431 float MapgenV7::baseTerrainLevelFromMap(int index)
 432 {
 433         float hselect = rangelim(noise_height_select->result[index], 0.0f, 1.0f);
 434         float height_base = noise_terrain_base->result[index];
 435         float height_alt = noise_terrain_alt->result[index];
 436
 437         if (height_alt > height_base)
 438                 return height_alt;
 439
 440         return (height_base * hselect) + (height_alt * (1.0f - hselect));
 441 }
 442
 443
 444 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 445 {
 446         float mnt_h_n =
 447                 std::fmax(NoisePerlin2D(&noise_mount_height->np, x, z, seed), 1.0f);
 448         float density_gradient = -((float)(y - mount_zero_level) / mnt_h_n);
 449         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 450
 451         return mnt_n + density_gradient >= 0.0f;
 452 }
 453
 454
 455 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 456 {
 457         float mounthn = std::fmax(noise_mount_height->result[idx_xz], 1.0f);
 458         float density_gradient = -((float)(y - mount_zero_level) / mounthn);
 459         float mountn = noise_mountain->result[idx_xyz];
 460
 461         return mountn + density_gradient >= 0.0f;
 462 }
 463
 464
 465 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 466 {
 467         // Make rim 2 nodes thick to match floatland base terrain
 468         float density_gradient = (y >= floatland_level) ?
 469                 -std::pow((float)(y - floatland_level) / float_mount_height,
 470                 float_mount_exponent) :
 471                 -std::pow((float)(floatland_level - 1 - y) / float_mount_height,
 472                 float_mount_exponent);
 473
 474         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 475
 476         return floatn + density_gradient >= 0.0f;
 477 }
 478
 479
 480 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max,
 481         int idx_xz)
 482 {
 483         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 484         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 485         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 486
 487         float n_base = noise_floatland_base->result[idx_xz];
 488         if (n_base > 0.0f) {
 489                 float n_base_height =
 490                                 std::fmax(noise_float_base_height->result[idx_xz], 1.0f);
 491                 float amp = n_base * n_base_height;
 492                 float ridge = n_base_height / 3.0f;
 493                 base_min = floatland_level - amp / 1.5f;
 494
 495                 if (amp > ridge * 2.0f) {
 496                         // Lake bed
 497                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 498                 } else {
 499                         // Hills and ridges
 500                         float diff = std::fabs(amp - ridge) / ridge;
 501                         // Smooth ridges using the 'smoothstep function'
 502                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 503                         base_max = floatland_level + ridge - smooth_diff * ridge;
 504                 }
 505         }
 506
 507         *float_base_min = base_min;
 508         *float_base_max = base_max;
 509 }
 510
 511
 512 int MapgenV7::generateTerrain()
 513 {
 514         MapNode n_air(CONTENT_AIR);
 515         MapNode n_stone(c_stone);
 516         MapNode n_water(c_water_source);
 517
 518         //// Calculate noise for terrain generation
 519         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 520         float *persistmap = noise_terrain_persist->result;
 521
 522         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 523         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 524         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 525
 526         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 527                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 528         }
 529
 530         if (spflags & MGV7_MOUNTAINS) {
 531                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 532         }
 533
 534         if (spflags & MGV7_FLOATLANDS) {
 535                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 536                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 537         }
 538
 539         //// Place nodes
 540         const v3s16 &em = vm->m_area.getExtent();
 541         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 542         u32 index2d = 0;
 543
 544         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 545         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 546                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 547                 if (surface_y > stone_surface_max_y)
 548                         stone_surface_max_y = surface_y;
 549
 550                 // Get extent of floatland base terrain
 551                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 552                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 553                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 554                 if (spflags & MGV7_FLOATLANDS)
 555                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 556
 557                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 558                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 559
 560                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1;
 561                                 y++,
 562                                 index3d += ystride,
 563                                 VoxelArea::add_y(em, vi, 1)) {
 564                         if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
 565                                 continue;
 566
 567                         if (y <= surface_y) {
 568                                 vm->m_data[vi] = n_stone; // Base terrain
 569                         } else if ((spflags & MGV7_MOUNTAINS) &&
 570                                         getMountainTerrainFromMap(index3d, index2d, y)) {
 571                                 vm->m_data[vi] = n_stone; // Mountain terrain
 572                                 if (y > stone_surface_max_y)
 573                                         stone_surface_max_y = y;
 574                         } else if ((spflags & MGV7_FLOATLANDS) &&
 575                                         ((y >= float_base_min && y <= float_base_max) ||
 576                                         getFloatlandMountainFromMap(index3d, index2d, y))) {
 577                                 vm->m_data[vi] = n_stone; // Floatland terrain
 578                                 stone_surface_max_y = node_max.Y;
 579                         } else if (y <= water_level) {
 580                                 vm->m_data[vi] = n_water; // Ground level water
 581                         } else if ((spflags & MGV7_FLOATLANDS) &&
 582                                         (y >= float_base_max && y <= floatland_level)) {
 583                                 vm->m_data[vi] = n_water; // Floatland water
 584                         } else {
 585                                 vm->m_data[vi] = n_air;
 586                         }
 587                 }
 588         }
 589
 590         return stone_surface_max_y;
 591 }
 592
 593
 594 void MapgenV7::generateRidgeTerrain()
 595 {
 596         if (node_max.Y < water_level - 16 ||
 597                         ((spflags & MGV7_FLOATLANDS) && node_max.Y > shadow_limit))
 598                 return;
 599
 600         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 601         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 602
 603         MapNode n_water(c_water_source);
 604         MapNode n_air(CONTENT_AIR);
 605         u32 index3d = 0;
 606         float width = 0.2f;
 607
 608         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 609         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 610                 u32 vi = vm->m_area.index(node_min.X, y, z);
 611                 for (s16 x = node_min.X; x <= node_max.X; x++, index3d++, vi++) {
 612                         u32 index2d = (z - node_min.Z) * csize.X + (x - node_min.X);
 613                         float uwatern = noise_ridge_uwater->result[index2d] * 2.0f;
 614                         if (std::fabs(uwatern) > width)
 615                                 continue;
 616                         // Optimises, but also avoids removing nodes placed by mods in
 617                         // 'on-generated', when generating outside mapchunk.
 618                         content_t c = vm->m_data[vi].getContent();
 619                         if (c != c_stone)
 620                                 continue;
 621
 622                         float altitude = y - water_level;
 623                         float height_mod = (altitude + 17.0f) / 2.5f;
 624                         float width_mod = width - std::fabs(uwatern);
 625                         float nridge = noise_ridge->result[index3d] *
 626                                 std::fmax(altitude, 0.0f) / 7.0f;
 627                         if (nridge + width_mod * height_mod < 0.6f)
 628                                 continue;
 629
 630                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 631                 }
 632         }
 633 }