src/mapgen/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013-2016 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2014-2017 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 "voxel.h"
  24 #include "noise.h"
  25 #include "mapblock.h"
  26 #include "mapnode.h"
  27 #include "map.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "voxelalgorithms.h"
  31 //#include "profiler.h" // For TimeTaker
  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
  70         // This is to avoid a divide-by-zero.
  71         // Parameter will be saved to map_meta.txt in limited form.
  72         params->float_mount_height = MYMAX(params->float_mount_height, 1.0f);
  73         float_mount_height   = params->float_mount_height;
  74
  75         // 2D noise
  76         noise_terrain_base    = new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  77         noise_terrain_alt     = new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  78         noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  79         noise_height_select   = new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  80         noise_filler_depth    = new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  81
  82         if (spflags & MGV7_MOUNTAINS)
  83                 noise_mount_height = new Noise(&params->np_mount_height, seed, csize.X, csize.Z);
  84
  85         if (spflags & MGV7_FLOATLANDS) {
  86                 noise_floatland_base    = new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  87                 noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
  88         }
  89
  90         if (spflags & MGV7_RIDGES) {
  91                 noise_ridge_uwater = new Noise(&params->np_ridge_uwater, seed, csize.X, csize.Z);
  92         // 3D noise, 1-up 1-down overgeneration
  93                 noise_ridge = new Noise(&params->np_ridge, seed, csize.X, csize.Y + 2, csize.Z);
  94         }
  95         // 3D noise, 1 up, 1 down overgeneration
  96         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
  97                 noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  98         // 3D noise, 1 down overgeneration
  99         MapgenBasic::np_cave1  = params->np_cave1;
 100         MapgenBasic::np_cave2  = params->np_cave2;
 101         MapgenBasic::np_cavern = params->np_cavern;
 102 }
 103
 104
 105 MapgenV7::~MapgenV7()
 106 {
 107         delete noise_terrain_base;
 108         delete noise_terrain_alt;
 109         delete noise_terrain_persist;
 110         delete noise_height_select;
 111         delete noise_filler_depth;
 112
 113         if (spflags & MGV7_MOUNTAINS)
 114                 delete noise_mount_height;
 115
 116         if (spflags & MGV7_FLOATLANDS) {
 117                 delete noise_floatland_base;
 118                 delete noise_float_base_height;
 119         }
 120
 121         if (spflags & MGV7_RIDGES) {
 122                 delete noise_ridge_uwater;
 123                 delete noise_ridge;
 124         }
 125
 126         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 127                 delete noise_mountain;
 128 }
 129
 130
 131 MapgenV7Params::MapgenV7Params():
 132         np_terrain_base      (4,    70,   v3f(600,  600,  600),  82341, 5, 0.6,  2.0),
 133         np_terrain_alt       (4,    25,   v3f(600,  600,  600),  5934,  5, 0.6,  2.0),
 134         np_terrain_persist   (0.6,  0.1,  v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0),
 135         np_height_select     (-8,   16,   v3f(500,  500,  500),  4213,  6, 0.7,  2.0),
 136         np_filler_depth      (0,    1.2,  v3f(150,  150,  150),  261,   3, 0.7,  2.0),
 137         np_mount_height      (256,  112,  v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0),
 138         np_ridge_uwater      (0,    1,    v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0),
 139         np_floatland_base    (-0.6, 1.5,  v3f(600,  600,  600),  114,   5, 0.6,  2.0),
 140         np_float_base_height (48,   24,   v3f(300,  300,  300),  907,   4, 0.7,  2.0),
 141         np_mountain          (-0.6, 1,    v3f(250,  350,  250),  5333,  5, 0.63, 2.0),
 142         np_ridge             (0,    1,    v3f(100,  100,  100),  6467,  4, 0.75, 2.0),
 143         np_cavern            (0,    1,    v3f(384,  128,  384),  723,   5, 0.63, 2.0),
 144         np_cave1             (0,    12,   v3f(61,   61,   61),   52534, 3, 0.5,  2.0),
 145         np_cave2             (0,    12,   v3f(67,   67,   67),   10325, 3, 0.5,  2.0)
 146 {
 147 }
 148
 149
 150 void MapgenV7Params::readParams(const Settings *settings)
 151 {
 152         settings->getFlagStrNoEx("mgv7_spflags",            spflags, flagdesc_mapgen_v7);
 153         settings->getS16NoEx("mgv7_mount_zero_level",       mount_zero_level);
 154         settings->getFloatNoEx("mgv7_cave_width",           cave_width);
 155         settings->getS16NoEx("mgv7_large_cave_depth",       large_cave_depth);
 156         settings->getS16NoEx("mgv7_lava_depth",             lava_depth);
 157         settings->getFloatNoEx("mgv7_float_mount_density",  float_mount_density);
 158         settings->getFloatNoEx("mgv7_float_mount_height",   float_mount_height);
 159         settings->getFloatNoEx("mgv7_float_mount_exponent", float_mount_exponent);
 160         settings->getS16NoEx("mgv7_floatland_level",        floatland_level);
 161         settings->getS16NoEx("mgv7_shadow_limit",           shadow_limit);
 162         settings->getS16NoEx("mgv7_cavern_limit",           cavern_limit);
 163         settings->getS16NoEx("mgv7_cavern_taper",           cavern_taper);
 164         settings->getFloatNoEx("mgv7_cavern_threshold",     cavern_threshold);
 165
 166         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 167         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 168         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 169         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 170         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 171         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 172         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 173         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 174         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 175         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 176         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 177         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 178         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 179         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 180 }
 181
 182
 183 void MapgenV7Params::writeParams(Settings *settings) const
 184 {
 185         settings->setFlagStr("mgv7_spflags",            spflags, flagdesc_mapgen_v7, U32_MAX);
 186         settings->setS16("mgv7_mount_zero_level",       mount_zero_level);
 187         settings->setFloat("mgv7_cave_width",           cave_width);
 188         settings->setS16("mgv7_large_cave_depth",       large_cave_depth);
 189         settings->setS16("mgv7_lava_depth",             lava_depth);
 190         settings->setFloat("mgv7_float_mount_density",  float_mount_density);
 191         settings->setFloat("mgv7_float_mount_height",   float_mount_height);
 192         settings->setFloat("mgv7_float_mount_exponent", float_mount_exponent);
 193         settings->setS16("mgv7_floatland_level",        floatland_level);
 194         settings->setS16("mgv7_shadow_limit",           shadow_limit);
 195         settings->setS16("mgv7_cavern_limit",           cavern_limit);
 196         settings->setS16("mgv7_cavern_taper",           cavern_taper);
 197         settings->setFloat("mgv7_cavern_threshold",     cavern_threshold);
 198
 199         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 200         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 201         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 202         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 203         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 204         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 205         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 206         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 207         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 208         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 209         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 210         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 211         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 212         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 213 }
 214
 215
 216 ///////////////////////////////////////////////////////////////////////////////
 217
 218
 219 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 220 {
 221         // If rivers are enabled, first check if in a river
 222         if (spflags & MGV7_RIDGES) {
 223                 float width = 0.2;
 224                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 225                 if (fabs(uwatern) <= width)
 226                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 227         }
 228
 229         // Terrain noise 'offset' is the average level of that terrain.
 230         // At least 50% of terrain will be below the higher of base and alt terrain
 231         // 'offset's.
 232         // Raising the maximum spawn level above 'water_level + 16' is necessary
 233         // for when terrain 'offset's are set much higher than water_level.
 234         s16 max_spawn_y = MYMAX(MYMAX(noise_terrain_alt->np.offset,
 235                         noise_terrain_base->np.offset),
 236                         water_level + 16);
 237         // Base terrain calculation
 238         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 239
 240         // If mountains are disabled, terrain level is base terrain level.
 241         // Avoids mid-air spawn where mountain terrain would have been.
 242         if (!(spflags & MGV7_MOUNTAINS)) {
 243                 if (y < water_level || y > max_spawn_y)
 244                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 245
 246                 // y + 2 because y is surface level and due to biome 'dust'
 247                 return y + 2;
 248         }
 249
 250         // Search upwards for first node without mountain terrain
 251         int iters = 256;
 252         while (iters > 0 && y <= max_spawn_y) {
 253                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {
 254                         if (y <= water_level || y > max_spawn_y)
 255                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 256
 257                         // y + 1 due to biome 'dust'
 258                         return y + 1;
 259                 }
 260                 y++;
 261                 iters--;
 262         }
 263
 264         // Unsuitable spawn point
 265         return MAX_MAP_GENERATION_LIMIT;
 266 }
 267
 268
 269 void MapgenV7::makeChunk(BlockMakeData *data)
 270 {
 271         // Pre-conditions
 272         assert(data->vmanip);
 273         assert(data->nodedef);
 274         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 275                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 276                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 277         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 278                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 279                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 280
 281         this->generating = true;
 282         this->vm   = data->vmanip;
 283         this->ndef = data->nodedef;
 284         //TimeTaker t("makeChunk");
 285
 286         v3s16 blockpos_min = data->blockpos_min;
 287         v3s16 blockpos_max = data->blockpos_max;
 288         node_min = blockpos_min * MAP_BLOCKSIZE;
 289         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 290         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 291         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 292
 293         blockseed = getBlockSeed2(full_node_min, seed);
 294
 295         // Generate base and mountain terrain
 296         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 297         s16 stone_surface_max_y = generateTerrain();
 298
 299         // Generate rivers
 300         if (spflags & MGV7_RIDGES)
 301                 generateRidgeTerrain();
 302
 303         // Create heightmap
 304         updateHeightmap(node_min, node_max);
 305
 306         // Init biome generator, place biome-specific nodes, and build biomemap
 307         biomegen->calcBiomeNoise(node_min);
 308
 309         MgStoneType mgstone_type;
 310         content_t biome_stone;
 311         generateBiomes(&mgstone_type, &biome_stone);
 312
 313         // Generate caverns, tunnels and classic caves
 314         if (flags & MG_CAVES) {
 315                 bool near_cavern = false;
 316                 // Generate caverns
 317                 if (spflags & MGV7_CAVERNS)
 318                         near_cavern = generateCaverns(stone_surface_max_y);
 319                 // Generate tunnels and classic caves
 320                 if (near_cavern)
 321                         // Disable classic caves in this mapchunk by setting
 322                         // 'large cave depth' to world base. Avoids excessive liquid in
 323                         // large caverns and floating blobs of overgenerated liquid.
 324                         generateCaves(stone_surface_max_y, -MAX_MAP_GENERATION_LIMIT);
 325                 else
 326                         generateCaves(stone_surface_max_y, large_cave_depth);
 327         }
 328
 329         // Generate dungeons
 330         if (flags & MG_DUNGEONS)
 331                 generateDungeons(stone_surface_max_y, mgstone_type, biome_stone);
 332
 333         // Generate the registered decorations
 334         if (flags & MG_DECORATIONS)
 335                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 336
 337         // Generate the registered ores
 338         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 339
 340         // Sprinkle some dust on top after everything else was generated
 341         dustTopNodes();
 342
 343         //printf("makeChunk: %dms\n", t.stop());
 344
 345         // Update liquids
 346         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 347
 348         // Calculate lighting
 349         // Limit floatland shadow
 350         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 351                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 352
 353         if (flags & MG_LIGHT)
 354                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 355                         full_node_min, full_node_max, propagate_shadow);
 356
 357         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 358         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 359
 360         this->generating = false;
 361 }
 362
 363
 364 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 365 {
 366         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 367         hselect = rangelim(hselect, 0.0, 1.0);
 368
 369         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 370
 371         noise_terrain_base->np.persist = persist;
 372         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 373
 374         noise_terrain_alt->np.persist = persist;
 375         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 376
 377         if (height_alt > height_base)
 378                 return height_alt;
 379
 380         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 381 }
 382
 383
 384 float MapgenV7::baseTerrainLevelFromMap(int index)
 385 {
 386         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 387         float height_base = noise_terrain_base->result[index];
 388         float height_alt  = noise_terrain_alt->result[index];
 389
 390         if (height_alt > height_base)
 391                 return height_alt;
 392
 393         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 394 }
 395
 396
 397 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 398 {
 399         float mnt_h_n =
 400                         MYMAX(NoisePerlin2D(&noise_mount_height->np, x, z, seed), 1.0f);
 401         float density_gradient = -((float)(y - mount_zero_level) / mnt_h_n);
 402         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 403
 404         return mnt_n + density_gradient >= 0.0;
 405 }
 406
 407
 408 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 409 {
 410         float mounthn = MYMAX(noise_mount_height->result[idx_xz], 1.0f);
 411         float density_gradient = -((float)(y - mount_zero_level) / mounthn);
 412         float mountn = noise_mountain->result[idx_xyz];
 413
 414         return mountn + density_gradient >= 0.0;
 415 }
 416
 417
 418 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 419 {
 420         // Make rim 2 nodes thick to match floatland base terrain
 421         float density_gradient = (y >= floatland_level) ?
 422                 -pow((float)(y - floatland_level) / float_mount_height,
 423                 float_mount_exponent) :
 424                 -pow((float)(floatland_level - 1 - y) / float_mount_height,
 425                 float_mount_exponent);
 426
 427         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 428
 429         return floatn + density_gradient >= 0.0f;
 430 }
 431
 432
 433 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
 434 {
 435         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 436         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 437         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 438
 439         float n_base = noise_floatland_base->result[idx_xz];
 440         if (n_base > 0.0f) {
 441                 float n_base_height =
 442                                 MYMAX(noise_float_base_height->result[idx_xz], 1.0f);
 443                 float amp = n_base * n_base_height;
 444                 float ridge = n_base_height / 3.0f;
 445                 base_min = floatland_level - amp / 1.5f;
 446
 447                 if (amp > ridge * 2.0f) {
 448                         // Lake bed
 449                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 450                 } else {
 451                         // Hills and ridges
 452                         float diff = fabs(amp - ridge) / ridge;
 453                         // Smooth ridges using the 'smoothstep function'
 454                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 455                         base_max = floatland_level + ridge - smooth_diff * ridge;
 456                 }
 457         }
 458
 459         *float_base_min = base_min;
 460         *float_base_max = base_max;
 461 }
 462
 463
 464 int MapgenV7::generateTerrain()
 465 {
 466         MapNode n_air(CONTENT_AIR);
 467         MapNode n_stone(c_stone);
 468         MapNode n_water(c_water_source);
 469
 470         //// Calculate noise for terrain generation
 471         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 472         float *persistmap = noise_terrain_persist->result;
 473
 474         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 475         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 476         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 477
 478         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 479                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 480         }
 481
 482         if (spflags & MGV7_MOUNTAINS) {
 483                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 484         }
 485
 486         if (spflags & MGV7_FLOATLANDS) {
 487                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 488                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 489         }
 490
 491         //// Place nodes
 492         const v3s16 &em = vm->m_area.getExtent();
 493         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 494         u32 index2d = 0;
 495
 496         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 497         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 498                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 499                 if (surface_y > stone_surface_max_y)
 500                         stone_surface_max_y = surface_y;
 501
 502                 // Get extent of floatland base terrain
 503                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 504                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 505                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 506                 if (spflags & MGV7_FLOATLANDS)
 507                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 508
 509                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 510                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 511
 512                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 513                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 514                                 if (y <= surface_y) {
 515                                         vm->m_data[vi] = n_stone;  // Base terrain
 516                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 517                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 518                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 519                                         if (y > stone_surface_max_y)
 520                                                 stone_surface_max_y = y;
 521                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 522                                                 ((y >= float_base_min && y <= float_base_max) ||
 523                                                 getFloatlandMountainFromMap(index3d, index2d, y))) {
 524                                         vm->m_data[vi] = n_stone;  // Floatland terrain
 525                                         stone_surface_max_y = node_max.Y;
 526                                 } else if (y <= water_level) {
 527                                         vm->m_data[vi] = n_water;  // Ground level water
 528                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 529                                                 (y >= float_base_max && y <= floatland_level)) {
 530                                         vm->m_data[vi] = n_water;  // Floatland water
 531                                 } else {
 532                                         vm->m_data[vi] = n_air;
 533                                 }
 534                         }
 535                         vm->m_area.add_y(em, vi, 1);
 536                         index3d += ystride;
 537                 }
 538         }
 539
 540         return stone_surface_max_y;
 541 }
 542
 543
 544 void MapgenV7::generateRidgeTerrain()
 545 {
 546         if (node_max.Y < water_level - 16 ||
 547                         ((spflags & MGV7_FLOATLANDS) && node_max.Y > shadow_limit))
 548                 return;
 549
 550         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 551         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 552
 553         MapNode n_water(c_water_source);
 554         MapNode n_air(CONTENT_AIR);
 555         u32 index = 0;
 556         float width = 0.2;
 557
 558         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 559         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 560                 u32 vi = vm->m_area.index(node_min.X, y, z);
 561                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 562                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 563
 564                         float uwatern = noise_ridge_uwater->result[j] * 2;
 565                         if (fabs(uwatern) > width)
 566                                 continue;
 567
 568                         float altitude = y - water_level;
 569                         float height_mod = (altitude + 17) / 2.5;
 570                         float width_mod  = width - fabs(uwatern);
 571                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 572
 573                         if (nridge + width_mod * height_mod < 0.6)
 574                                 continue;
 575
 576                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 577                 }
 578         }
 579 }
 580
 581
 582 ////////////////////////////////////////////////////////////////////////////////
 583 //// Code Boneyard
 584 ////
 585 //// Much of the stuff here has potential to become useful again at some point
 586 //// in the future, but we don't want it to get lost or forgotten in version
 587 //// control.
 588 ////
 589
 590 #if 0
 591 int MapgenV7::generateMountainTerrain(s16 ymax)
 592 {
 593         MapNode n_stone(c_stone);
 594         u32 j = 0;
 595
 596         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 597         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 598                 u32 vi = vm->m_area.index(node_min.X, y, z);
 599                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 600                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 601                         content_t c = vm->m_data[vi].getContent();
 602
 603                         if (getMountainTerrainFromMap(j, index, y)
 604                                         && (c == CONTENT_AIR || c == c_water_source)) {
 605                                 vm->m_data[vi] = n_stone;
 606                                 if (y > ymax)
 607                                         ymax = y;
 608                         }
 609
 610                         vi++;
 611                         j++;
 612                 }
 613         }
 614
 615         return ymax;
 616 }
 617 #endif
 618
 619
 620 #if 0
 621 void MapgenV7::carveRivers() {
 622         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 623         MapNode n_stone(c_stone);
 624         u32 index = 0;
 625
 626         int river_depth = 4;
 627
 628         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 629         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 630                 float terrain_mod  = noise_terrain_mod->result[index];
 631                 NoiseParams *np = noise_terrain_river->np;
 632                 np.persist = noise_terrain_persist->result[index];
 633                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 634                 float height = terrain_river * (1 - abs(terrain_mod)) *
 635                                                 noise_terrain_river->np.scale;
 636                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 637
 638                 s16 y = heightmap[index];
 639                 if (height < 1.0 && y > river_depth &&
 640                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 641
 642                         for (s16 ry = y; ry != y - river_depth; ry--) {
 643                                 u32 vi = vm->m_area.index(x, ry, z);
 644                                 vm->m_data[vi] = n_air;
 645                         }
 646
 647                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 648                         vm->m_data[vi] = n_water_source;
 649                 }
 650         }
 651 }
 652 #endif
 653
 654
 655 #if 0
 656 void MapgenV7::addTopNodes()
 657 {
 658         v3s16 em = vm->m_area.getExtent();
 659         s16 ntopnodes;
 660         u32 index = 0;
 661
 662         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 663         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 664                 Biome *biome = bmgr->biomes[biomemap[index]];
 665
 666                 //////////////////// First, add top nodes below the ridge
 667                 s16 y = ridge_heightmap[index];
 668
 669                 // This cutoff is good enough, but not perfect.
 670                 // It will cut off potentially placed top nodes at chunk boundaries
 671                 if (y < node_min.Y)
 672                         continue;
 673                 if (y > node_max.Y) {
 674                         y = node_max.Y; // Let's see if we can still go downward anyway
 675                         u32 vi = vm->m_area.index(x, y, z);
 676                         content_t c = vm->m_data[vi].getContent();
 677                         if (ndef->get(c).walkable)
 678                                 continue;
 679                 }
 680
 681                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 682                 // might not be the actual height, just the lowest part in the chunk
 683                 // where a ridge had been carved
 684                 u32 i = vm->m_area.index(x, y, z);
 685                 for (; y >= node_min.Y; y--) {
 686                         content_t c = vm->m_data[i].getContent();
 687                         if (ndef->get(c).walkable)
 688                                 break;
 689                         vm->m_area.add_y(em, i, -1);
 690                 }
 691
 692                 if (y != node_min.Y - 1 && y >= water_level) {
 693                         ridge_heightmap[index] = y; //update ridgeheight
 694                         ntopnodes = biome->top_depth;
 695                         for (; y <= node_max.Y && ntopnodes; y++) {
 696                                 ntopnodes--;
 697                                 vm->m_data[i] = MapNode(biome->c_top);
 698                                 vm->m_area.add_y(em, i, 1);
 699                         }
 700                         // If dirt, grow grass on it.
 701                         if (y > water_level - 10 &&
 702                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 703                                 vm->m_area.add_y(em, i, -1);
 704                                 if (vm->m_data[i].getContent() == c_dirt)
 705                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 706                         }
 707                 }
 708
 709                 //////////////////// Now, add top nodes on top of the ridge
 710                 y = heightmap[index];
 711                 if (y > node_max.Y) {
 712                         y = node_max.Y; // Let's see if we can still go downward anyway
 713                         u32 vi = vm->m_area.index(x, y, z);
 714                         content_t c = vm->m_data[vi].getContent();
 715                         if (ndef->get(c).walkable)
 716                                 continue;
 717                 }
 718
 719                 i = vm->m_area.index(x, y, z);
 720                 for (; y >= node_min.Y; y--) {
 721                         content_t c = vm->m_data[i].getContent();
 722                         if (ndef->get(c).walkable)
 723                                 break;
 724                         vm->m_area.add_y(em, i, -1);
 725                 }
 726
 727                 if (y != node_min.Y - 1) {
 728                         ntopnodes = biome->top_depth;
 729                         // Let's see if we've already added it...
 730                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 731                                 continue;
 732
 733                         for (; y <= node_max.Y && ntopnodes; y++) {
 734                                 ntopnodes--;
 735                                 vm->m_data[i] = MapNode(biome->c_top);
 736                                 vm->m_area.add_y(em, i, 1);
 737                         }
 738                         // If dirt, grow grass on it.
 739                         if (y > water_level - 10 &&
 740                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 741                                 vm->m_area.add_y(em, i, -1);
 742                                 if (vm->m_data[i].getContent() == c_dirt)
 743                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 744                         }
 745                 }
 746         }
 747 }
 748 #endif