src/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         this->spflags             = params->spflags;
  58         this->cave_width          = params->cave_width;
  59         this->float_mount_density = params->float_mount_density;
  60         this->float_mount_height  = params->float_mount_height;
  61         this->floatland_level     = params->floatland_level;
  62         this->shadow_limit        = params->shadow_limit;
  63         this->cavern_limit        = params->cavern_limit;
  64         this->cavern_taper        = params->cavern_taper;
  65         this->cavern_threshold    = params->cavern_threshold;
  66
  67         // 2D noise
  68         noise_terrain_base    = new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  69         noise_terrain_alt     = new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  70         noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  71         noise_height_select   = new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  72         noise_filler_depth    = new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  73
  74         if (spflags & MGV7_MOUNTAINS)
  75                 noise_mount_height = new Noise(&params->np_mount_height, seed, csize.X, csize.Z);
  76
  77         if (spflags & MGV7_FLOATLANDS) {
  78                 noise_floatland_base    = new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  79                 noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
  80         }
  81
  82         if (spflags & MGV7_RIDGES) {
  83                 noise_ridge_uwater = new Noise(&params->np_ridge_uwater, seed, csize.X, csize.Z);
  84         // 3D noise, 1-up 1-down overgeneration
  85                 noise_ridge = new Noise(&params->np_ridge, seed, csize.X, csize.Y + 2, csize.Z);
  86         }
  87         // 3D noise, 1 up, 1 down overgeneration
  88         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
  89                 noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  90         // 3D noise, 1 down overgeneration
  91         MapgenBasic::np_cave1  = params->np_cave1;
  92         MapgenBasic::np_cave2  = params->np_cave2;
  93         MapgenBasic::np_cavern = params->np_cavern;
  94 }
  95
  96
  97 MapgenV7::~MapgenV7()
  98 {
  99         delete noise_terrain_base;
 100         delete noise_terrain_alt;
 101         delete noise_terrain_persist;
 102         delete noise_height_select;
 103         delete noise_filler_depth;
 104
 105         if (spflags & MGV7_MOUNTAINS)
 106                 delete noise_mount_height;
 107
 108         if (spflags & MGV7_FLOATLANDS) {
 109                 delete noise_floatland_base;
 110                 delete noise_float_base_height;
 111         }
 112
 113         if (spflags & MGV7_RIDGES) {
 114                 delete noise_ridge_uwater;
 115                 delete noise_ridge;
 116         }
 117
 118         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 119                 delete noise_mountain;
 120 }
 121
 122
 123 MapgenV7Params::MapgenV7Params()
 124 {
 125         np_terrain_base      = NoiseParams(4,    70,   v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 126         np_terrain_alt       = NoiseParams(4,    25,   v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 127         np_terrain_persist   = NoiseParams(0.6,  0.1,  v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 128         np_height_select     = NoiseParams(-8,   16,   v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 129         np_filler_depth      = NoiseParams(0,    1.2,  v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 130         np_mount_height      = NoiseParams(256,  112,  v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 131         np_ridge_uwater      = NoiseParams(0,    1,    v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 132         np_floatland_base    = NoiseParams(-0.6, 1.5,  v3f(600,  600,  600),  114,   5, 0.6,  2.0);
 133         np_float_base_height = NoiseParams(48,   24,   v3f(300,  300,  300),  907,   4, 0.7,  2.0);
 134         np_mountain          = NoiseParams(-0.6, 1,    v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 135         np_ridge             = NoiseParams(0,    1,    v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 136         np_cavern            = NoiseParams(0,    1,    v3f(384,  128,  384),  723,   5, 0.63, 2.0);
 137         np_cave1             = NoiseParams(0,    12,   v3f(61,   61,   61),   52534, 3, 0.5,  2.0);
 138         np_cave2             = NoiseParams(0,    12,   v3f(67,   67,   67),   10325, 3, 0.5,  2.0);
 139 }
 140
 141
 142 void MapgenV7Params::readParams(const Settings *settings)
 143 {
 144         settings->getFlagStrNoEx("mgv7_spflags",           spflags, flagdesc_mapgen_v7);
 145         settings->getFloatNoEx("mgv7_cave_width",          cave_width);
 146         settings->getFloatNoEx("mgv7_float_mount_density", float_mount_density);
 147         settings->getFloatNoEx("mgv7_float_mount_height",  float_mount_height);
 148         settings->getS16NoEx("mgv7_floatland_level",       floatland_level);
 149         settings->getS16NoEx("mgv7_shadow_limit",          shadow_limit);
 150         settings->getS16NoEx("mgv7_cavern_limit",          cavern_limit);
 151         settings->getS16NoEx("mgv7_cavern_taper",          cavern_taper);
 152         settings->getFloatNoEx("mgv7_cavern_threshold",    cavern_threshold);
 153
 154         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 155         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 156         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 157         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 158         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 159         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 160         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 161         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 162         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 163         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 164         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 165         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 166         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 167         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 168 }
 169
 170
 171 void MapgenV7Params::writeParams(Settings *settings) const
 172 {
 173         settings->setFlagStr("mgv7_spflags",           spflags, flagdesc_mapgen_v7, U32_MAX);
 174         settings->setFloat("mgv7_cave_width",          cave_width);
 175         settings->setFloat("mgv7_float_mount_density", float_mount_density);
 176         settings->setFloat("mgv7_float_mount_height",  float_mount_height);
 177         settings->setS16("mgv7_floatland_level",       floatland_level);
 178         settings->setS16("mgv7_shadow_limit",          shadow_limit);
 179         settings->setS16("mgv7_cavern_limit",          cavern_limit);
 180         settings->setS16("mgv7_cavern_taper",          cavern_taper);
 181         settings->setFloat("mgv7_cavern_threshold",    cavern_threshold);
 182
 183         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 184         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 185         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 186         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 187         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 188         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 189         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 190         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 191         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 192         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 193         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 194         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 195         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 196         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 197 }
 198
 199
 200 ///////////////////////////////////////////////////////////////////////////////
 201
 202
 203 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 204 {
 205         // If rivers are enabled, first check if in a river
 206         if (spflags & MGV7_RIDGES) {
 207                 float width = 0.2;
 208                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 209                 if (fabs(uwatern) <= width)
 210                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 211         }
 212
 213         // Terrain noise 'offset' is the average level of that terrain.
 214         // At least 50% of terrain will be below the higher of base and alt terrain
 215         // 'offset's.
 216         // Raising the maximum spawn level above 'water_level + 16' is necessary
 217         // for when terrain 'offset's are set much higher than water_level.
 218         s16 max_spawn_y = MYMAX(MYMAX(noise_terrain_alt->np.offset,
 219                         noise_terrain_base->np.offset),
 220                         water_level + 16);
 221         // Base terrain calculation
 222         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 223
 224         // If mountains are disabled, terrain level is base terrain level.
 225         // Avoids mid-air spawn where mountain terrain would have been.
 226         if (!(spflags & MGV7_MOUNTAINS)) {
 227                 if (y <= water_level || y > max_spawn_y)
 228                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 229                 else
 230                         // + 1 to not be half-buried in a potential node-deep biome 'dust'
 231                         return y + 1;
 232         }
 233
 234         // Search upwards for first node without mountain terrain
 235         int iters = 256;
 236         while (iters > 0 && y <= max_spawn_y) {
 237                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // If air above
 238                         if (y <= water_level || y > max_spawn_y)
 239                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 240                         else
 241                                 return y + 1;
 242                 }
 243                 y++;
 244                 iters--;
 245         }
 246
 247         // Unsuitable spawn point
 248         return MAX_MAP_GENERATION_LIMIT;
 249 }
 250
 251
 252 void MapgenV7::makeChunk(BlockMakeData *data)
 253 {
 254         // Pre-conditions
 255         assert(data->vmanip);
 256         assert(data->nodedef);
 257         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 258                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 259                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 260         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 261                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 262                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 263
 264         this->generating = true;
 265         this->vm   = data->vmanip;
 266         this->ndef = data->nodedef;
 267         //TimeTaker t("makeChunk");
 268
 269         v3s16 blockpos_min = data->blockpos_min;
 270         v3s16 blockpos_max = data->blockpos_max;
 271         node_min = blockpos_min * MAP_BLOCKSIZE;
 272         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 273         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 274         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 275
 276         blockseed = getBlockSeed2(full_node_min, seed);
 277
 278         // Generate base and mountain terrain
 279         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 280         s16 stone_surface_max_y = generateTerrain();
 281
 282         // Generate rivers
 283         if (spflags & MGV7_RIDGES)
 284                 generateRidgeTerrain();
 285
 286         // Create heightmap
 287         updateHeightmap(node_min, node_max);
 288
 289         // Init biome generator, place biome-specific nodes, and build biomemap
 290         biomegen->calcBiomeNoise(node_min);
 291         MgStoneType stone_type = generateBiomes();
 292
 293         // Generate caverns, tunnels and classic caves
 294         if (flags & MG_CAVES) {
 295                 bool near_cavern = false;
 296                 // Generate caverns
 297                 if (spflags & MGV7_CAVERNS)
 298                         near_cavern = generateCaverns(stone_surface_max_y);
 299                 // Generate tunnels and classic caves
 300                 if (near_cavern)
 301                         // Disable classic caves in this mapchunk by setting
 302                         // 'large cave depth' to world base. Avoids excessive liquid in
 303                         // large caverns and floating blobs of overgenerated liquid.
 304                         generateCaves(stone_surface_max_y, -MAX_MAP_GENERATION_LIMIT);
 305                 else
 306                         generateCaves(stone_surface_max_y, water_level);
 307         }
 308
 309         // Generate dungeons
 310         if (flags & MG_DUNGEONS)
 311                 generateDungeons(stone_surface_max_y, stone_type);
 312
 313         // Generate the registered decorations
 314         if (flags & MG_DECORATIONS)
 315                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 316
 317         // Generate the registered ores
 318         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 319
 320         // Sprinkle some dust on top after everything else was generated
 321         dustTopNodes();
 322
 323         //printf("makeChunk: %dms\n", t.stop());
 324
 325         // Update liquids
 326         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 327
 328         // Calculate lighting
 329         // Limit floatland shadow
 330         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 331                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 332
 333         if (flags & MG_LIGHT)
 334                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 335                         full_node_min, full_node_max, propagate_shadow);
 336
 337         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 338         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 339
 340         this->generating = false;
 341 }
 342
 343
 344 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 345 {
 346         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 347         hselect = rangelim(hselect, 0.0, 1.0);
 348
 349         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 350
 351         noise_terrain_base->np.persist = persist;
 352         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 353
 354         noise_terrain_alt->np.persist = persist;
 355         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 356
 357         if (height_alt > height_base)
 358                 return height_alt;
 359
 360         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 361 }
 362
 363
 364 float MapgenV7::baseTerrainLevelFromMap(int index)
 365 {
 366         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 367         float height_base = noise_terrain_base->result[index];
 368         float height_alt  = noise_terrain_alt->result[index];
 369
 370         if (height_alt > height_base)
 371                 return height_alt;
 372
 373         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 374 }
 375
 376
 377 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 378 {
 379         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 380         float density_gradient = -((float)y / mnt_h_n);
 381         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 382
 383         return mnt_n + density_gradient >= 0.0;
 384 }
 385
 386
 387 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 388 {
 389         float mounthn = noise_mount_height->result[idx_xz];
 390         float density_gradient = -((float)y / mounthn);
 391         float mountn = noise_mountain->result[idx_xyz];
 392
 393         return mountn + density_gradient >= 0.0;
 394 }
 395
 396
 397 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 398 {
 399         // Make rim 2 nodes thick to match floatland base terrain
 400         float density_gradient = (y >= floatland_level) ?
 401                 -pow((float)(y - floatland_level) / float_mount_height, 0.75f) :
 402                 -pow((float)(floatland_level - 1 - y) / float_mount_height, 0.75f);
 403
 404         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 405
 406         return floatn + density_gradient >= 0.0f;
 407 }
 408
 409
 410 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
 411 {
 412         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 413         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 414         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 415
 416         float n_base = noise_floatland_base->result[idx_xz];
 417         if (n_base > 0.0f) {
 418                 float n_base_height = noise_float_base_height->result[idx_xz];
 419                 float amp = n_base * n_base_height;
 420                 float ridge = n_base_height / 3.0f;
 421                 base_min = floatland_level - amp / 1.5f;
 422
 423                 if (amp > ridge * 2.0f) {
 424                         // Lake bed
 425                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 426                 } else {
 427                         // Hills and ridges
 428                         float diff = fabs(amp - ridge) / ridge;
 429                         // Smooth ridges using the 'smoothstep function'
 430                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 431                         base_max = floatland_level + ridge - smooth_diff * ridge;
 432                 }
 433         }
 434
 435         *float_base_min = base_min;
 436         *float_base_max = base_max;
 437 }
 438
 439
 440 int MapgenV7::generateTerrain()
 441 {
 442         MapNode n_air(CONTENT_AIR);
 443         MapNode n_stone(c_stone);
 444         MapNode n_water(c_water_source);
 445
 446         //// Calculate noise for terrain generation
 447         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 448         float *persistmap = noise_terrain_persist->result;
 449
 450         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 451         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 452         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 453
 454         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 455                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 456         }
 457
 458         if (spflags & MGV7_MOUNTAINS) {
 459                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 460         }
 461
 462         if (spflags & MGV7_FLOATLANDS) {
 463                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 464                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 465         }
 466
 467         //// Place nodes
 468         v3s16 em = vm->m_area.getExtent();
 469         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 470         u32 index2d = 0;
 471
 472         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 473         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 474                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 475                 if (surface_y > stone_surface_max_y)
 476                         stone_surface_max_y = surface_y;
 477
 478                 // Get extent of floatland base terrain
 479                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 480                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 481                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 482                 if (spflags & MGV7_FLOATLANDS)
 483                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 484
 485                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 486                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 487
 488                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 489                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 490                                 if (y <= surface_y) {
 491                                         vm->m_data[vi] = n_stone;  // Base terrain
 492                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 493                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 494                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 495                                         if (y > stone_surface_max_y)
 496                                                 stone_surface_max_y = y;
 497                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 498                                                 ((y >= float_base_min && y <= float_base_max) ||
 499                                                 getFloatlandMountainFromMap(index3d, index2d, y))) {
 500                                         vm->m_data[vi] = n_stone;  // Floatland terrain
 501                                         stone_surface_max_y = node_max.Y;
 502                                 } else if (y <= water_level) {
 503                                         vm->m_data[vi] = n_water;  // Ground level water
 504                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 505                                                 (y >= float_base_max && y <= floatland_level)) {
 506                                         vm->m_data[vi] = n_water;  // Floatland water
 507                                 } else {
 508                                         vm->m_data[vi] = n_air;
 509                                 }
 510                         }
 511                         vm->m_area.add_y(em, vi, 1);
 512                         index3d += ystride;
 513                 }
 514         }
 515
 516         return stone_surface_max_y;
 517 }
 518
 519
 520 void MapgenV7::generateRidgeTerrain()
 521 {
 522         if (node_max.Y < water_level - 16 ||
 523                         ((spflags & MGV7_FLOATLANDS) && node_max.Y > shadow_limit))
 524                 return;
 525
 526         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 527         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 528
 529         MapNode n_water(c_water_source);
 530         MapNode n_air(CONTENT_AIR);
 531         u32 index = 0;
 532         float width = 0.2;
 533
 534         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 535         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 536                 u32 vi = vm->m_area.index(node_min.X, y, z);
 537                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 538                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 539
 540                         float uwatern = noise_ridge_uwater->result[j] * 2;
 541                         if (fabs(uwatern) > width)
 542                                 continue;
 543
 544                         float altitude = y - water_level;
 545                         float height_mod = (altitude + 17) / 2.5;
 546                         float width_mod  = width - fabs(uwatern);
 547                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 548
 549                         if (nridge + width_mod * height_mod < 0.6)
 550                                 continue;
 551
 552                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 553                 }
 554         }
 555 }
 556
 557
 558 ////////////////////////////////////////////////////////////////////////////////
 559 //// Code Boneyard
 560 ////
 561 //// Much of the stuff here has potential to become useful again at some point
 562 //// in the future, but we don't want it to get lost or forgotten in version
 563 //// control.
 564 ////
 565
 566 #if 0
 567 int MapgenV7::generateMountainTerrain(s16 ymax)
 568 {
 569         MapNode n_stone(c_stone);
 570         u32 j = 0;
 571
 572         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 573         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 574                 u32 vi = vm->m_area.index(node_min.X, y, z);
 575                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 576                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 577                         content_t c = vm->m_data[vi].getContent();
 578
 579                         if (getMountainTerrainFromMap(j, index, y)
 580                                         && (c == CONTENT_AIR || c == c_water_source)) {
 581                                 vm->m_data[vi] = n_stone;
 582                                 if (y > ymax)
 583                                         ymax = y;
 584                         }
 585
 586                         vi++;
 587                         j++;
 588                 }
 589         }
 590
 591         return ymax;
 592 }
 593 #endif
 594
 595
 596 #if 0
 597 void MapgenV7::carveRivers() {
 598         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 599         MapNode n_stone(c_stone);
 600         u32 index = 0;
 601
 602         int river_depth = 4;
 603
 604         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 605         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 606                 float terrain_mod  = noise_terrain_mod->result[index];
 607                 NoiseParams *np = noise_terrain_river->np;
 608                 np.persist = noise_terrain_persist->result[index];
 609                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 610                 float height = terrain_river * (1 - abs(terrain_mod)) *
 611                                                 noise_terrain_river->np.scale;
 612                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 613
 614                 s16 y = heightmap[index];
 615                 if (height < 1.0 && y > river_depth &&
 616                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 617
 618                         for (s16 ry = y; ry != y - river_depth; ry--) {
 619                                 u32 vi = vm->m_area.index(x, ry, z);
 620                                 vm->m_data[vi] = n_air;
 621                         }
 622
 623                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 624                         vm->m_data[vi] = n_water_source;
 625                 }
 626         }
 627 }
 628 #endif
 629
 630
 631 #if 0
 632 void MapgenV7::addTopNodes()
 633 {
 634         v3s16 em = vm->m_area.getExtent();
 635         s16 ntopnodes;
 636         u32 index = 0;
 637
 638         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 639         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 640                 Biome *biome = bmgr->biomes[biomemap[index]];
 641
 642                 //////////////////// First, add top nodes below the ridge
 643                 s16 y = ridge_heightmap[index];
 644
 645                 // This cutoff is good enough, but not perfect.
 646                 // It will cut off potentially placed top nodes at chunk boundaries
 647                 if (y < node_min.Y)
 648                         continue;
 649                 if (y > node_max.Y) {
 650                         y = node_max.Y; // Let's see if we can still go downward anyway
 651                         u32 vi = vm->m_area.index(x, y, z);
 652                         content_t c = vm->m_data[vi].getContent();
 653                         if (ndef->get(c).walkable)
 654                                 continue;
 655                 }
 656
 657                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 658                 // might not be the actual height, just the lowest part in the chunk
 659                 // where a ridge had been carved
 660                 u32 i = vm->m_area.index(x, y, z);
 661                 for (; y >= node_min.Y; y--) {
 662                         content_t c = vm->m_data[i].getContent();
 663                         if (ndef->get(c).walkable)
 664                                 break;
 665                         vm->m_area.add_y(em, i, -1);
 666                 }
 667
 668                 if (y != node_min.Y - 1 && y >= water_level) {
 669                         ridge_heightmap[index] = y; //update ridgeheight
 670                         ntopnodes = biome->top_depth;
 671                         for (; y <= node_max.Y && ntopnodes; y++) {
 672                                 ntopnodes--;
 673                                 vm->m_data[i] = MapNode(biome->c_top);
 674                                 vm->m_area.add_y(em, i, 1);
 675                         }
 676                         // If dirt, grow grass on it.
 677                         if (y > water_level - 10 &&
 678                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 679                                 vm->m_area.add_y(em, i, -1);
 680                                 if (vm->m_data[i].getContent() == c_dirt)
 681                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 682                         }
 683                 }
 684
 685                 //////////////////// Now, add top nodes on top of the ridge
 686                 y = heightmap[index];
 687                 if (y > node_max.Y) {
 688                         y = node_max.Y; // Let's see if we can still go downward anyway
 689                         u32 vi = vm->m_area.index(x, y, z);
 690                         content_t c = vm->m_data[vi].getContent();
 691                         if (ndef->get(c).walkable)
 692                                 continue;
 693                 }
 694
 695                 i = vm->m_area.index(x, y, z);
 696                 for (; y >= node_min.Y; y--) {
 697                         content_t c = vm->m_data[i].getContent();
 698                         if (ndef->get(c).walkable)
 699                                 break;
 700                         vm->m_area.add_y(em, i, -1);
 701                 }
 702
 703                 if (y != node_min.Y - 1) {
 704                         ntopnodes = biome->top_depth;
 705                         // Let's see if we've already added it...
 706                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 707                                 continue;
 708
 709                         for (; y <= node_max.Y && ntopnodes; y++) {
 710                                 ntopnodes--;
 711                                 vm->m_data[i] = MapNode(biome->c_top);
 712                                 vm->m_area.add_y(em, i, 1);
 713                         }
 714                         // If dirt, grow grass on it.
 715                         if (y > water_level - 10 &&
 716                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 717                                 vm->m_area.add_y(em, i, -1);
 718                                 if (vm->m_data[i].getContent() == c_dirt)
 719                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 720                         }
 721                 }
 722         }
 723 }
 724 #endif