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 "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         dungeon_ymin         = params->dungeon_ymin;
  70         dungeon_ymax         = params->dungeon_ymax;
  71
  72         // This is to avoid a divide-by-zero.
  73         // Parameter will be saved to map_meta.txt in limited form.
  74         params->float_mount_height = MYMAX(params->float_mount_height, 1.0f);
  75         float_mount_height   = params->float_mount_height;
  76
  77         // 2D noise
  78         noise_terrain_base    = new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  79         noise_terrain_alt     = new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  80         noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  81         noise_height_select   = new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  82         noise_filler_depth    = new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  83
  84         if (spflags & MGV7_MOUNTAINS)
  85                 noise_mount_height = new Noise(&params->np_mount_height, seed, csize.X, csize.Z);
  86
  87         if (spflags & MGV7_FLOATLANDS) {
  88                 noise_floatland_base    = new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  89                 noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
  90         }
  91
  92         if (spflags & MGV7_RIDGES) {
  93                 noise_ridge_uwater = new Noise(&params->np_ridge_uwater, seed, csize.X, csize.Z);
  94         // 3D noise, 1-up 1-down overgeneration
  95                 noise_ridge = new Noise(&params->np_ridge, seed, csize.X, csize.Y + 2, csize.Z);
  96         }
  97         // 3D noise, 1 up, 1 down overgeneration
  98         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
  99                 noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
 100         // 3D noise, 1 down overgeneration
 101         MapgenBasic::np_cave1  = params->np_cave1;
 102         MapgenBasic::np_cave2  = params->np_cave2;
 103         MapgenBasic::np_cavern = params->np_cavern;
 104 }
 105
 106
 107 MapgenV7::~MapgenV7()
 108 {
 109         delete noise_terrain_base;
 110         delete noise_terrain_alt;
 111         delete noise_terrain_persist;
 112         delete noise_height_select;
 113         delete noise_filler_depth;
 114
 115         if (spflags & MGV7_MOUNTAINS)
 116                 delete noise_mount_height;
 117
 118         if (spflags & MGV7_FLOATLANDS) {
 119                 delete noise_floatland_base;
 120                 delete noise_float_base_height;
 121         }
 122
 123         if (spflags & MGV7_RIDGES) {
 124                 delete noise_ridge_uwater;
 125                 delete noise_ridge;
 126         }
 127
 128         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 129                 delete noise_mountain;
 130 }
 131
 132
 133 MapgenV7Params::MapgenV7Params():
 134         np_terrain_base      (4,    70,   v3f(600,  600,  600),  82341, 5, 0.6,  2.0),
 135         np_terrain_alt       (4,    25,   v3f(600,  600,  600),  5934,  5, 0.6,  2.0),
 136         np_terrain_persist   (0.6,  0.1,  v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0),
 137         np_height_select     (-8,   16,   v3f(500,  500,  500),  4213,  6, 0.7,  2.0),
 138         np_filler_depth      (0,    1.2,  v3f(150,  150,  150),  261,   3, 0.7,  2.0),
 139         np_mount_height      (256,  112,  v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0),
 140         np_ridge_uwater      (0,    1,    v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0),
 141         np_floatland_base    (-0.6, 1.5,  v3f(600,  600,  600),  114,   5, 0.6,  2.0),
 142         np_float_base_height (48,   24,   v3f(300,  300,  300),  907,   4, 0.7,  2.0),
 143         np_mountain          (-0.6, 1,    v3f(250,  350,  250),  5333,  5, 0.63, 2.0),
 144         np_ridge             (0,    1,    v3f(100,  100,  100),  6467,  4, 0.75, 2.0),
 145         np_cavern            (0,    1,    v3f(384,  128,  384),  723,   5, 0.63, 2.0),
 146         np_cave1             (0,    12,   v3f(61,   61,   61),   52534, 3, 0.5,  2.0),
 147         np_cave2             (0,    12,   v3f(67,   67,   67),   10325, 3, 0.5,  2.0)
 148 {
 149 }
 150
 151
 152 void MapgenV7Params::readParams(const Settings *settings)
 153 {
 154         settings->getFlagStrNoEx("mgv7_spflags",            spflags, flagdesc_mapgen_v7);
 155         settings->getS16NoEx("mgv7_mount_zero_level",       mount_zero_level);
 156         settings->getFloatNoEx("mgv7_cave_width",           cave_width);
 157         settings->getS16NoEx("mgv7_large_cave_depth",       large_cave_depth);
 158         settings->getS16NoEx("mgv7_lava_depth",             lava_depth);
 159         settings->getFloatNoEx("mgv7_float_mount_density",  float_mount_density);
 160         settings->getFloatNoEx("mgv7_float_mount_height",   float_mount_height);
 161         settings->getFloatNoEx("mgv7_float_mount_exponent", float_mount_exponent);
 162         settings->getS16NoEx("mgv7_floatland_level",        floatland_level);
 163         settings->getS16NoEx("mgv7_shadow_limit",           shadow_limit);
 164         settings->getS16NoEx("mgv7_cavern_limit",           cavern_limit);
 165         settings->getS16NoEx("mgv7_cavern_taper",           cavern_taper);
 166         settings->getFloatNoEx("mgv7_cavern_threshold",     cavern_threshold);
 167         settings->getS16NoEx("mgv7_dungeon_ymin",           dungeon_ymin);
 168         settings->getS16NoEx("mgv7_dungeon_ymax",           dungeon_ymax);
 169
 170         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 171         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 172         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 173         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 174         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 175         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 176         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 177         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 178         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 179         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 180         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 181         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 182         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 183         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 184 }
 185
 186
 187 void MapgenV7Params::writeParams(Settings *settings) const
 188 {
 189         settings->setFlagStr("mgv7_spflags",            spflags, flagdesc_mapgen_v7, U32_MAX);
 190         settings->setS16("mgv7_mount_zero_level",       mount_zero_level);
 191         settings->setFloat("mgv7_cave_width",           cave_width);
 192         settings->setS16("mgv7_large_cave_depth",       large_cave_depth);
 193         settings->setS16("mgv7_lava_depth",             lava_depth);
 194         settings->setFloat("mgv7_float_mount_density",  float_mount_density);
 195         settings->setFloat("mgv7_float_mount_height",   float_mount_height);
 196         settings->setFloat("mgv7_float_mount_exponent", float_mount_exponent);
 197         settings->setS16("mgv7_floatland_level",        floatland_level);
 198         settings->setS16("mgv7_shadow_limit",           shadow_limit);
 199         settings->setS16("mgv7_cavern_limit",           cavern_limit);
 200         settings->setS16("mgv7_cavern_taper",           cavern_taper);
 201         settings->setFloat("mgv7_cavern_threshold",     cavern_threshold);
 202         settings->setS16("mgv7_dungeon_ymin",           dungeon_ymin);
 203         settings->setS16("mgv7_dungeon_ymax",           dungeon_ymax);
 204
 205         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 206         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 207         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 208         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 209         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 210         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 211         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 212         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 213         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 214         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 215         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 216         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 217         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 218         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 219 }
 220
 221
 222 ///////////////////////////////////////////////////////////////////////////////
 223
 224
 225 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 226 {
 227         // If rivers are enabled, first check if in a river
 228         if (spflags & MGV7_RIDGES) {
 229                 float width = 0.2;
 230                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 231                 if (fabs(uwatern) <= width)
 232                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 233         }
 234
 235         // Terrain noise 'offset' is the average level of that terrain.
 236         // At least 50% of terrain will be below the higher of base and alt terrain
 237         // 'offset's.
 238         // Raising the maximum spawn level above 'water_level + 16' is necessary
 239         // for when terrain 'offset's are set much higher than water_level.
 240         s16 max_spawn_y = MYMAX(MYMAX(noise_terrain_alt->np.offset,
 241                         noise_terrain_base->np.offset),
 242                         water_level + 16);
 243         // Base terrain calculation
 244         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 245
 246         // If mountains are disabled, terrain level is base terrain level.
 247         // Avoids mid-air spawn where mountain terrain would have been.
 248         if (!(spflags & MGV7_MOUNTAINS)) {
 249                 if (y < water_level || y > max_spawn_y)
 250                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 251
 252                 // y + 2 because y is surface level and due to biome 'dust'
 253                 return y + 2;
 254         }
 255
 256         // Search upwards for first node without mountain terrain
 257         int iters = 256;
 258         while (iters > 0 && y <= max_spawn_y) {
 259                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {
 260                         if (y <= water_level || y > max_spawn_y)
 261                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 262
 263                         // y + 1 due to biome 'dust'
 264                         return y + 1;
 265                 }
 266                 y++;
 267                 iters--;
 268         }
 269
 270         // Unsuitable spawn point
 271         return MAX_MAP_GENERATION_LIMIT;
 272 }
 273
 274
 275 void MapgenV7::makeChunk(BlockMakeData *data)
 276 {
 277         // Pre-conditions
 278         assert(data->vmanip);
 279         assert(data->nodedef);
 280         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 281                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 282                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 283         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 284                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 285                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 286
 287         this->generating = true;
 288         this->vm   = data->vmanip;
 289         this->ndef = data->nodedef;
 290         //TimeTaker t("makeChunk");
 291
 292         v3s16 blockpos_min = data->blockpos_min;
 293         v3s16 blockpos_max = data->blockpos_max;
 294         node_min = blockpos_min * MAP_BLOCKSIZE;
 295         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 296         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 297         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 298
 299         blockseed = getBlockSeed2(full_node_min, seed);
 300
 301         // Generate base and mountain terrain
 302         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 303         s16 stone_surface_max_y = generateTerrain();
 304
 305         // Generate rivers
 306         if (spflags & MGV7_RIDGES)
 307                 generateRidgeTerrain();
 308
 309         // Create heightmap
 310         updateHeightmap(node_min, node_max);
 311
 312         // Init biome generator, place biome-specific nodes, and build biomemap
 313         biomegen->calcBiomeNoise(node_min);
 314
 315         MgStoneType mgstone_type;
 316         content_t biome_stone;
 317         generateBiomes(&mgstone_type, &biome_stone);
 318
 319         // Generate caverns, tunnels and classic caves
 320         if (flags & MG_CAVES) {
 321                 bool near_cavern = false;
 322                 // Generate caverns
 323                 if (spflags & MGV7_CAVERNS)
 324                         near_cavern = generateCaverns(stone_surface_max_y);
 325                 // Generate tunnels and classic caves
 326                 if (near_cavern)
 327                         // Disable classic caves in this mapchunk by setting
 328                         // 'large cave depth' to world base. Avoids excessive liquid in
 329                         // large caverns and floating blobs of overgenerated liquid.
 330                         generateCaves(stone_surface_max_y, -MAX_MAP_GENERATION_LIMIT);
 331                 else
 332                         generateCaves(stone_surface_max_y, large_cave_depth);
 333         }
 334
 335         // Generate dungeons
 336         if ((flags & MG_DUNGEONS) && full_node_min.Y >= dungeon_ymin &&
 337                         full_node_max.Y <= dungeon_ymax)
 338                 generateDungeons(stone_surface_max_y, mgstone_type, biome_stone);
 339
 340         // Generate the registered decorations
 341         if (flags & MG_DECORATIONS)
 342                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 343
 344         // Generate the registered ores
 345         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 346
 347         // Sprinkle some dust on top after everything else was generated
 348         dustTopNodes();
 349
 350         //printf("makeChunk: %dms\n", t.stop());
 351
 352         // Update liquids
 353         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 354
 355         // Calculate lighting
 356         // Limit floatland shadow
 357         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 358                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 359
 360         if (flags & MG_LIGHT)
 361                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 362                         full_node_min, full_node_max, propagate_shadow);
 363
 364         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 365         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 366
 367         this->generating = false;
 368 }
 369
 370
 371 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 372 {
 373         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 374         hselect = rangelim(hselect, 0.0, 1.0);
 375
 376         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 377
 378         noise_terrain_base->np.persist = persist;
 379         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 380
 381         noise_terrain_alt->np.persist = persist;
 382         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 383
 384         if (height_alt > height_base)
 385                 return height_alt;
 386
 387         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 388 }
 389
 390
 391 float MapgenV7::baseTerrainLevelFromMap(int index)
 392 {
 393         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 394         float height_base = noise_terrain_base->result[index];
 395         float height_alt  = noise_terrain_alt->result[index];
 396
 397         if (height_alt > height_base)
 398                 return height_alt;
 399
 400         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 401 }
 402
 403
 404 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 405 {
 406         float mnt_h_n =
 407                         MYMAX(NoisePerlin2D(&noise_mount_height->np, x, z, seed), 1.0f);
 408         float density_gradient = -((float)(y - mount_zero_level) / mnt_h_n);
 409         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 410
 411         return mnt_n + density_gradient >= 0.0;
 412 }
 413
 414
 415 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 416 {
 417         float mounthn = MYMAX(noise_mount_height->result[idx_xz], 1.0f);
 418         float density_gradient = -((float)(y - mount_zero_level) / mounthn);
 419         float mountn = noise_mountain->result[idx_xyz];
 420
 421         return mountn + density_gradient >= 0.0;
 422 }
 423
 424
 425 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 426 {
 427         // Make rim 2 nodes thick to match floatland base terrain
 428         float density_gradient = (y >= floatland_level) ?
 429                 -pow((float)(y - floatland_level) / float_mount_height,
 430                 float_mount_exponent) :
 431                 -pow((float)(floatland_level - 1 - y) / float_mount_height,
 432                 float_mount_exponent);
 433
 434         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 435
 436         return floatn + density_gradient >= 0.0f;
 437 }
 438
 439
 440 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
 441 {
 442         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 443         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 444         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 445
 446         float n_base = noise_floatland_base->result[idx_xz];
 447         if (n_base > 0.0f) {
 448                 float n_base_height =
 449                                 MYMAX(noise_float_base_height->result[idx_xz], 1.0f);
 450                 float amp = n_base * n_base_height;
 451                 float ridge = n_base_height / 3.0f;
 452                 base_min = floatland_level - amp / 1.5f;
 453
 454                 if (amp > ridge * 2.0f) {
 455                         // Lake bed
 456                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 457                 } else {
 458                         // Hills and ridges
 459                         float diff = fabs(amp - ridge) / ridge;
 460                         // Smooth ridges using the 'smoothstep function'
 461                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 462                         base_max = floatland_level + ridge - smooth_diff * ridge;
 463                 }
 464         }
 465
 466         *float_base_min = base_min;
 467         *float_base_max = base_max;
 468 }
 469
 470
 471 int MapgenV7::generateTerrain()
 472 {
 473         MapNode n_air(CONTENT_AIR);
 474         MapNode n_stone(c_stone);
 475         MapNode n_water(c_water_source);
 476
 477         //// Calculate noise for terrain generation
 478         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 479         float *persistmap = noise_terrain_persist->result;
 480
 481         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 482         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 483         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 484
 485         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 486                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 487         }
 488
 489         if (spflags & MGV7_MOUNTAINS) {
 490                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 491         }
 492
 493         if (spflags & MGV7_FLOATLANDS) {
 494                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 495                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 496         }
 497
 498         //// Place nodes
 499         const v3s16 &em = vm->m_area.getExtent();
 500         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 501         u32 index2d = 0;
 502
 503         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 504         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 505                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 506                 if (surface_y > stone_surface_max_y)
 507                         stone_surface_max_y = surface_y;
 508
 509                 // Get extent of floatland base terrain
 510                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 511                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 512                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 513                 if (spflags & MGV7_FLOATLANDS)
 514                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 515
 516                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 517                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 518
 519                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 520                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 521                                 if (y <= surface_y) {
 522                                         vm->m_data[vi] = n_stone;  // Base terrain
 523                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 524                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 525                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 526                                         if (y > stone_surface_max_y)
 527                                                 stone_surface_max_y = y;
 528                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 529                                                 ((y >= float_base_min && y <= float_base_max) ||
 530                                                 getFloatlandMountainFromMap(index3d, index2d, y))) {
 531                                         vm->m_data[vi] = n_stone;  // Floatland terrain
 532                                         stone_surface_max_y = node_max.Y;
 533                                 } else if (y <= water_level) {
 534                                         vm->m_data[vi] = n_water;  // Ground level water
 535                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 536                                                 (y >= float_base_max && y <= floatland_level)) {
 537                                         vm->m_data[vi] = n_water;  // Floatland water
 538                                 } else {
 539                                         vm->m_data[vi] = n_air;
 540                                 }
 541                         }
 542                         vm->m_area.add_y(em, vi, 1);
 543                         index3d += ystride;
 544                 }
 545         }
 546
 547         return stone_surface_max_y;
 548 }
 549
 550
 551 void MapgenV7::generateRidgeTerrain()
 552 {
 553         if (node_max.Y < water_level - 16 ||
 554                         ((spflags & MGV7_FLOATLANDS) && node_max.Y > shadow_limit))
 555                 return;
 556
 557         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 558         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 559
 560         MapNode n_water(c_water_source);
 561         MapNode n_air(CONTENT_AIR);
 562         u32 index = 0;
 563         float width = 0.2;
 564
 565         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 566         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 567                 u32 vi = vm->m_area.index(node_min.X, y, z);
 568                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 569                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 570
 571                         float uwatern = noise_ridge_uwater->result[j] * 2;
 572                         if (fabs(uwatern) > width)
 573                                 continue;
 574
 575                         float altitude = y - water_level;
 576                         float height_mod = (altitude + 17) / 2.5;
 577                         float width_mod  = width - fabs(uwatern);
 578                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 579
 580                         if (nridge + width_mod * height_mod < 0.6)
 581                                 continue;
 582
 583                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 584                 }
 585         }
 586 }
 587
 588
 589 ////////////////////////////////////////////////////////////////////////////////
 590 //// Code Boneyard
 591 ////
 592 //// Much of the stuff here has potential to become useful again at some point
 593 //// in the future, but we don't want it to get lost or forgotten in version
 594 //// control.
 595 ////
 596
 597 #if 0
 598 int MapgenV7::generateMountainTerrain(s16 ymax)
 599 {
 600         MapNode n_stone(c_stone);
 601         u32 j = 0;
 602
 603         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 604         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 605                 u32 vi = vm->m_area.index(node_min.X, y, z);
 606                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 607                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 608                         content_t c = vm->m_data[vi].getContent();
 609
 610                         if (getMountainTerrainFromMap(j, index, y)
 611                                         && (c == CONTENT_AIR || c == c_water_source)) {
 612                                 vm->m_data[vi] = n_stone;
 613                                 if (y > ymax)
 614                                         ymax = y;
 615                         }
 616
 617                         vi++;
 618                         j++;
 619                 }
 620         }
 621
 622         return ymax;
 623 }
 624 #endif
 625
 626
 627 #if 0
 628 void MapgenV7::carveRivers() {
 629         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 630         MapNode n_stone(c_stone);
 631         u32 index = 0;
 632
 633         int river_depth = 4;
 634
 635         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 636         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 637                 float terrain_mod  = noise_terrain_mod->result[index];
 638                 NoiseParams *np = noise_terrain_river->np;
 639                 np.persist = noise_terrain_persist->result[index];
 640                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 641                 float height = terrain_river * (1 - abs(terrain_mod)) *
 642                                                 noise_terrain_river->np.scale;
 643                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 644
 645                 s16 y = heightmap[index];
 646                 if (height < 1.0 && y > river_depth &&
 647                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 648
 649                         for (s16 ry = y; ry != y - river_depth; ry--) {
 650                                 u32 vi = vm->m_area.index(x, ry, z);
 651                                 vm->m_data[vi] = n_air;
 652                         }
 653
 654                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 655                         vm->m_data[vi] = n_water_source;
 656                 }
 657         }
 658 }
 659 #endif
 660
 661
 662 #if 0
 663 void MapgenV7::addTopNodes()
 664 {
 665         v3s16 em = vm->m_area.getExtent();
 666         s16 ntopnodes;
 667         u32 index = 0;
 668
 669         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 670         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 671                 Biome *biome = bmgr->biomes[biomemap[index]];
 672
 673                 //////////////////// First, add top nodes below the ridge
 674                 s16 y = ridge_heightmap[index];
 675
 676                 // This cutoff is good enough, but not perfect.
 677                 // It will cut off potentially placed top nodes at chunk boundaries
 678                 if (y < node_min.Y)
 679                         continue;
 680                 if (y > node_max.Y) {
 681                         y = node_max.Y; // Let's see if we can still go downward anyway
 682                         u32 vi = vm->m_area.index(x, y, z);
 683                         content_t c = vm->m_data[vi].getContent();
 684                         if (ndef->get(c).walkable)
 685                                 continue;
 686                 }
 687
 688                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 689                 // might not be the actual height, just the lowest part in the chunk
 690                 // where a ridge had been carved
 691                 u32 i = vm->m_area.index(x, y, z);
 692                 for (; y >= node_min.Y; y--) {
 693                         content_t c = vm->m_data[i].getContent();
 694                         if (ndef->get(c).walkable)
 695                                 break;
 696                         vm->m_area.add_y(em, i, -1);
 697                 }
 698
 699                 if (y != node_min.Y - 1 && y >= water_level) {
 700                         ridge_heightmap[index] = y; //update ridgeheight
 701                         ntopnodes = biome->top_depth;
 702                         for (; y <= node_max.Y && ntopnodes; y++) {
 703                                 ntopnodes--;
 704                                 vm->m_data[i] = MapNode(biome->c_top);
 705                                 vm->m_area.add_y(em, i, 1);
 706                         }
 707                         // If dirt, grow grass on it.
 708                         if (y > water_level - 10 &&
 709                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 710                                 vm->m_area.add_y(em, i, -1);
 711                                 if (vm->m_data[i].getContent() == c_dirt)
 712                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 713                         }
 714                 }
 715
 716                 //////////////////// Now, add top nodes on top of the ridge
 717                 y = heightmap[index];
 718                 if (y > node_max.Y) {
 719                         y = node_max.Y; // Let's see if we can still go downward anyway
 720                         u32 vi = vm->m_area.index(x, y, z);
 721                         content_t c = vm->m_data[vi].getContent();
 722                         if (ndef->get(c).walkable)
 723                                 continue;
 724                 }
 725
 726                 i = vm->m_area.index(x, y, z);
 727                 for (; y >= node_min.Y; y--) {
 728                         content_t c = vm->m_data[i].getContent();
 729                         if (ndef->get(c).walkable)
 730                                 break;
 731                         vm->m_area.add_y(em, i, -1);
 732                 }
 733
 734                 if (y != node_min.Y - 1) {
 735                         ntopnodes = biome->top_depth;
 736                         // Let's see if we've already added it...
 737                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 738                                 continue;
 739
 740                         for (; y <= node_max.Y && ntopnodes; y++) {
 741                                 ntopnodes--;
 742                                 vm->m_data[i] = MapNode(biome->c_top);
 743                                 vm->m_area.add_y(em, i, 1);
 744                         }
 745                         // If dirt, grow grass on it.
 746                         if (y > water_level - 10 &&
 747                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 748                                 vm->m_area.add_y(em, i, -1);
 749                                 if (vm->m_data[i].getContent() == c_dirt)
 750                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 751                         }
 752                 }
 753         }
 754 }
 755 #endif