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