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->large_cave_depth    = params->large_cave_depth;
  60         this->float_mount_density = params->float_mount_density;
  61         this->float_mount_height  = params->float_mount_height;
  62         this->floatland_level     = params->floatland_level;
  63         this->shadow_limit        = params->shadow_limit;
  64         this->cavern_limit        = params->cavern_limit;
  65         this->cavern_taper        = params->cavern_taper;
  66         this->cavern_threshold    = params->cavern_threshold;
  67
  68         // 2D noise
  69         noise_terrain_base    = new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  70         noise_terrain_alt     = new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  71         noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  72         noise_height_select   = new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  73         noise_filler_depth    = new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  74
  75         if (spflags & MGV7_MOUNTAINS)
  76                 noise_mount_height = new Noise(&params->np_mount_height, seed, csize.X, csize.Z);
  77
  78         if (spflags & MGV7_FLOATLANDS) {
  79                 noise_floatland_base    = new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  80                 noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
  81         }
  82
  83         if (spflags & MGV7_RIDGES) {
  84                 noise_ridge_uwater = new Noise(&params->np_ridge_uwater, seed, csize.X, csize.Z);
  85         // 3D noise, 1-up 1-down overgeneration
  86                 noise_ridge = new Noise(&params->np_ridge, seed, csize.X, csize.Y + 2, csize.Z);
  87         }
  88         // 3D noise, 1 up, 1 down overgeneration
  89         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
  90                 noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  91         // 3D noise, 1 down overgeneration
  92         MapgenBasic::np_cave1  = params->np_cave1;
  93         MapgenBasic::np_cave2  = params->np_cave2;
  94         MapgenBasic::np_cavern = params->np_cavern;
  95 }
  96
  97
  98 MapgenV7::~MapgenV7()
  99 {
 100         delete noise_terrain_base;
 101         delete noise_terrain_alt;
 102         delete noise_terrain_persist;
 103         delete noise_height_select;
 104         delete noise_filler_depth;
 105
 106         if (spflags & MGV7_MOUNTAINS)
 107                 delete noise_mount_height;
 108
 109         if (spflags & MGV7_FLOATLANDS) {
 110                 delete noise_floatland_base;
 111                 delete noise_float_base_height;
 112         }
 113
 114         if (spflags & MGV7_RIDGES) {
 115                 delete noise_ridge_uwater;
 116                 delete noise_ridge;
 117         }
 118
 119         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 120                 delete noise_mountain;
 121 }
 122
 123
 124 MapgenV7Params::MapgenV7Params()
 125 {
 126         np_terrain_base      = NoiseParams(4,    70,   v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 127         np_terrain_alt       = NoiseParams(4,    25,   v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 128         np_terrain_persist   = NoiseParams(0.6,  0.1,  v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 129         np_height_select     = NoiseParams(-8,   16,   v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 130         np_filler_depth      = NoiseParams(0,    1.2,  v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 131         np_mount_height      = NoiseParams(256,  112,  v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 132         np_ridge_uwater      = NoiseParams(0,    1,    v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 133         np_floatland_base    = NoiseParams(-0.6, 1.5,  v3f(600,  600,  600),  114,   5, 0.6,  2.0);
 134         np_float_base_height = NoiseParams(48,   24,   v3f(300,  300,  300),  907,   4, 0.7,  2.0);
 135         np_mountain          = NoiseParams(-0.6, 1,    v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 136         np_ridge             = NoiseParams(0,    1,    v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 137         np_cavern            = NoiseParams(0,    1,    v3f(384,  128,  384),  723,   5, 0.63, 2.0);
 138         np_cave1             = NoiseParams(0,    12,   v3f(61,   61,   61),   52534, 3, 0.5,  2.0);
 139         np_cave2             = NoiseParams(0,    12,   v3f(67,   67,   67),   10325, 3, 0.5,  2.0);
 140 }
 141
 142
 143 void MapgenV7Params::readParams(const Settings *settings)
 144 {
 145         settings->getFlagStrNoEx("mgv7_spflags",           spflags, flagdesc_mapgen_v7);
 146         settings->getFloatNoEx("mgv7_cave_width",          cave_width);
 147         settings->getS16NoEx("mgv7_large_cave_depth",      large_cave_depth);
 148         settings->getFloatNoEx("mgv7_float_mount_density", float_mount_density);
 149         settings->getFloatNoEx("mgv7_float_mount_height",  float_mount_height);
 150         settings->getS16NoEx("mgv7_floatland_level",       floatland_level);
 151         settings->getS16NoEx("mgv7_shadow_limit",          shadow_limit);
 152         settings->getS16NoEx("mgv7_cavern_limit",          cavern_limit);
 153         settings->getS16NoEx("mgv7_cavern_taper",          cavern_taper);
 154         settings->getFloatNoEx("mgv7_cavern_threshold",    cavern_threshold);
 155
 156         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 157         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 158         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 159         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 160         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 161         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 162         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 163         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 164         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 165         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 166         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 167         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 168         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 169         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 170 }
 171
 172
 173 void MapgenV7Params::writeParams(Settings *settings) const
 174 {
 175         settings->setFlagStr("mgv7_spflags",           spflags, flagdesc_mapgen_v7, U32_MAX);
 176         settings->setFloat("mgv7_cave_width",          cave_width);
 177         settings->setS16("mgv7_large_cave_depth",      large_cave_depth);
 178         settings->setFloat("mgv7_float_mount_density", float_mount_density);
 179         settings->setFloat("mgv7_float_mount_height",  float_mount_height);
 180         settings->setS16("mgv7_floatland_level",       floatland_level);
 181         settings->setS16("mgv7_shadow_limit",          shadow_limit);
 182         settings->setS16("mgv7_cavern_limit",          cavern_limit);
 183         settings->setS16("mgv7_cavern_taper",          cavern_taper);
 184         settings->setFloat("mgv7_cavern_threshold",    cavern_threshold);
 185
 186         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 187         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 188         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 189         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 190         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 191         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 192         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 193         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 194         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 195         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 196         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 197         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 198         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 199         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 200 }
 201
 202
 203 ///////////////////////////////////////////////////////////////////////////////
 204
 205
 206 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 207 {
 208         // If rivers are enabled, first check if in a river
 209         if (spflags & MGV7_RIDGES) {
 210                 float width = 0.2;
 211                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 212                 if (fabs(uwatern) <= width)
 213                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 214         }
 215
 216         // Terrain noise 'offset' is the average level of that terrain.
 217         // At least 50% of terrain will be below the higher of base and alt terrain
 218         // 'offset's.
 219         // Raising the maximum spawn level above 'water_level + 16' is necessary
 220         // for when terrain 'offset's are set much higher than water_level.
 221         s16 max_spawn_y = MYMAX(MYMAX(noise_terrain_alt->np.offset,
 222                         noise_terrain_base->np.offset),
 223                         water_level + 16);
 224         // Base terrain calculation
 225         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 226
 227         // If mountains are disabled, terrain level is base terrain level.
 228         // Avoids mid-air spawn where mountain terrain would have been.
 229         if (!(spflags & MGV7_MOUNTAINS)) {
 230                 if (y <= water_level || y > max_spawn_y)
 231                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 232                 else
 233                         // + 1 to not be half-buried in a potential node-deep biome 'dust'
 234                         return y + 1;
 235         }
 236
 237         // Search upwards for first node without mountain terrain
 238         int iters = 256;
 239         while (iters > 0 && y <= max_spawn_y) {
 240                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // If air above
 241                         if (y <= water_level || y > max_spawn_y)
 242                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 243                         else
 244                                 return y + 1;
 245                 }
 246                 y++;
 247                 iters--;
 248         }
 249
 250         // Unsuitable spawn point
 251         return MAX_MAP_GENERATION_LIMIT;
 252 }
 253
 254
 255 void MapgenV7::makeChunk(BlockMakeData *data)
 256 {
 257         // Pre-conditions
 258         assert(data->vmanip);
 259         assert(data->nodedef);
 260         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 261                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 262                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 263         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 264                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 265                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 266
 267         this->generating = true;
 268         this->vm   = data->vmanip;
 269         this->ndef = data->nodedef;
 270         //TimeTaker t("makeChunk");
 271
 272         v3s16 blockpos_min = data->blockpos_min;
 273         v3s16 blockpos_max = data->blockpos_max;
 274         node_min = blockpos_min * MAP_BLOCKSIZE;
 275         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 276         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 277         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 278
 279         blockseed = getBlockSeed2(full_node_min, seed);
 280
 281         // Generate base and mountain terrain
 282         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 283         s16 stone_surface_max_y = generateTerrain();
 284
 285         // Generate rivers
 286         if (spflags & MGV7_RIDGES)
 287                 generateRidgeTerrain();
 288
 289         // Create heightmap
 290         updateHeightmap(node_min, node_max);
 291
 292         // Init biome generator, place biome-specific nodes, and build biomemap
 293         biomegen->calcBiomeNoise(node_min);
 294         MgStoneType stone_type = generateBiomes();
 295
 296         // Generate caverns, tunnels and classic caves
 297         if (flags & MG_CAVES) {
 298                 bool near_cavern = false;
 299                 // Generate caverns
 300                 if (spflags & MGV7_CAVERNS)
 301                         near_cavern = generateCaverns(stone_surface_max_y);
 302                 // Generate tunnels and classic caves
 303                 if (near_cavern)
 304                         // Disable classic caves in this mapchunk by setting
 305                         // 'large cave depth' to world base. Avoids excessive liquid in
 306                         // large caverns and floating blobs of overgenerated liquid.
 307                         generateCaves(stone_surface_max_y, -MAX_MAP_GENERATION_LIMIT);
 308                 else
 309                         generateCaves(stone_surface_max_y, large_cave_depth);
 310         }
 311
 312         // Generate dungeons
 313         if (flags & MG_DUNGEONS)
 314                 generateDungeons(stone_surface_max_y, stone_type);
 315
 316         // Generate the registered decorations
 317         if (flags & MG_DECORATIONS)
 318                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 319
 320         // Generate the registered ores
 321         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 322
 323         // Sprinkle some dust on top after everything else was generated
 324         dustTopNodes();
 325
 326         //printf("makeChunk: %dms\n", t.stop());
 327
 328         // Update liquids
 329         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 330
 331         // Calculate lighting
 332         // Limit floatland shadow
 333         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 334                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 335
 336         if (flags & MG_LIGHT)
 337                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 338                         full_node_min, full_node_max, propagate_shadow);
 339
 340         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 341         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 342
 343         this->generating = false;
 344 }
 345
 346
 347 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 348 {
 349         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 350         hselect = rangelim(hselect, 0.0, 1.0);
 351
 352         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 353
 354         noise_terrain_base->np.persist = persist;
 355         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 356
 357         noise_terrain_alt->np.persist = persist;
 358         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 359
 360         if (height_alt > height_base)
 361                 return height_alt;
 362
 363         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 364 }
 365
 366
 367 float MapgenV7::baseTerrainLevelFromMap(int index)
 368 {
 369         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 370         float height_base = noise_terrain_base->result[index];
 371         float height_alt  = noise_terrain_alt->result[index];
 372
 373         if (height_alt > height_base)
 374                 return height_alt;
 375
 376         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 377 }
 378
 379
 380 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 381 {
 382         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 383         float density_gradient = -((float)y / mnt_h_n);
 384         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 385
 386         return mnt_n + density_gradient >= 0.0;
 387 }
 388
 389
 390 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 391 {
 392         float mounthn = noise_mount_height->result[idx_xz];
 393         float density_gradient = -((float)y / mounthn);
 394         float mountn = noise_mountain->result[idx_xyz];
 395
 396         return mountn + density_gradient >= 0.0;
 397 }
 398
 399
 400 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 401 {
 402         // Make rim 2 nodes thick to match floatland base terrain
 403         float density_gradient = (y >= floatland_level) ?
 404                 -pow((float)(y - floatland_level) / float_mount_height, 0.75f) :
 405                 -pow((float)(floatland_level - 1 - y) / float_mount_height, 0.75f);
 406
 407         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 408
 409         return floatn + density_gradient >= 0.0f;
 410 }
 411
 412
 413 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
 414 {
 415         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 416         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 417         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 418
 419         float n_base = noise_floatland_base->result[idx_xz];
 420         if (n_base > 0.0f) {
 421                 float n_base_height = noise_float_base_height->result[idx_xz];
 422                 float amp = n_base * n_base_height;
 423                 float ridge = n_base_height / 3.0f;
 424                 base_min = floatland_level - amp / 1.5f;
 425
 426                 if (amp > ridge * 2.0f) {
 427                         // Lake bed
 428                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 429                 } else {
 430                         // Hills and ridges
 431                         float diff = fabs(amp - ridge) / ridge;
 432                         // Smooth ridges using the 'smoothstep function'
 433                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 434                         base_max = floatland_level + ridge - smooth_diff * ridge;
 435                 }
 436         }
 437
 438         *float_base_min = base_min;
 439         *float_base_max = base_max;
 440 }
 441
 442
 443 int MapgenV7::generateTerrain()
 444 {
 445         MapNode n_air(CONTENT_AIR);
 446         MapNode n_stone(c_stone);
 447         MapNode n_water(c_water_source);
 448
 449         //// Calculate noise for terrain generation
 450         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 451         float *persistmap = noise_terrain_persist->result;
 452
 453         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 454         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 455         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 456
 457         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 458                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 459         }
 460
 461         if (spflags & MGV7_MOUNTAINS) {
 462                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 463         }
 464
 465         if (spflags & MGV7_FLOATLANDS) {
 466                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 467                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 468         }
 469
 470         //// Place nodes
 471         v3s16 em = vm->m_area.getExtent();
 472         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 473         u32 index2d = 0;
 474
 475         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 476         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 477                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 478                 if (surface_y > stone_surface_max_y)
 479                         stone_surface_max_y = surface_y;
 480
 481                 // Get extent of floatland base terrain
 482                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 483                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 484                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 485                 if (spflags & MGV7_FLOATLANDS)
 486                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 487
 488                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 489                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 490
 491                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 492                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 493                                 if (y <= surface_y) {
 494                                         vm->m_data[vi] = n_stone;  // Base terrain
 495                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 496                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 497                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 498                                         if (y > stone_surface_max_y)
 499                                                 stone_surface_max_y = y;
 500                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 501                                                 ((y >= float_base_min && y <= float_base_max) ||
 502                                                 getFloatlandMountainFromMap(index3d, index2d, y))) {
 503                                         vm->m_data[vi] = n_stone;  // Floatland terrain
 504                                         stone_surface_max_y = node_max.Y;
 505                                 } else if (y <= water_level) {
 506                                         vm->m_data[vi] = n_water;  // Ground level water
 507                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 508                                                 (y >= float_base_max && y <= floatland_level)) {
 509                                         vm->m_data[vi] = n_water;  // Floatland water
 510                                 } else {
 511                                         vm->m_data[vi] = n_air;
 512                                 }
 513                         }
 514                         vm->m_area.add_y(em, vi, 1);
 515                         index3d += ystride;
 516                 }
 517         }
 518
 519         return stone_surface_max_y;
 520 }
 521
 522
 523 void MapgenV7::generateRidgeTerrain()
 524 {
 525         if (node_max.Y < water_level - 16 ||
 526                         ((spflags & MGV7_FLOATLANDS) && node_max.Y > shadow_limit))
 527                 return;
 528
 529         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 530         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 531
 532         MapNode n_water(c_water_source);
 533         MapNode n_air(CONTENT_AIR);
 534         u32 index = 0;
 535         float width = 0.2;
 536
 537         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 538         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 539                 u32 vi = vm->m_area.index(node_min.X, y, z);
 540                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 541                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 542
 543                         float uwatern = noise_ridge_uwater->result[j] * 2;
 544                         if (fabs(uwatern) > width)
 545                                 continue;
 546
 547                         float altitude = y - water_level;
 548                         float height_mod = (altitude + 17) / 2.5;
 549                         float width_mod  = width - fabs(uwatern);
 550                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 551
 552                         if (nridge + width_mod * height_mod < 0.6)
 553                                 continue;
 554
 555                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 556                 }
 557         }
 558 }
 559
 560
 561 ////////////////////////////////////////////////////////////////////////////////
 562 //// Code Boneyard
 563 ////
 564 //// Much of the stuff here has potential to become useful again at some point
 565 //// in the future, but we don't want it to get lost or forgotten in version
 566 //// control.
 567 ////
 568
 569 #if 0
 570 int MapgenV7::generateMountainTerrain(s16 ymax)
 571 {
 572         MapNode n_stone(c_stone);
 573         u32 j = 0;
 574
 575         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 576         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 577                 u32 vi = vm->m_area.index(node_min.X, y, z);
 578                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 579                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 580                         content_t c = vm->m_data[vi].getContent();
 581
 582                         if (getMountainTerrainFromMap(j, index, y)
 583                                         && (c == CONTENT_AIR || c == c_water_source)) {
 584                                 vm->m_data[vi] = n_stone;
 585                                 if (y > ymax)
 586                                         ymax = y;
 587                         }
 588
 589                         vi++;
 590                         j++;
 591                 }
 592         }
 593
 594         return ymax;
 595 }
 596 #endif
 597
 598
 599 #if 0
 600 void MapgenV7::carveRivers() {
 601         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 602         MapNode n_stone(c_stone);
 603         u32 index = 0;
 604
 605         int river_depth = 4;
 606
 607         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 608         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 609                 float terrain_mod  = noise_terrain_mod->result[index];
 610                 NoiseParams *np = noise_terrain_river->np;
 611                 np.persist = noise_terrain_persist->result[index];
 612                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 613                 float height = terrain_river * (1 - abs(terrain_mod)) *
 614                                                 noise_terrain_river->np.scale;
 615                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 616
 617                 s16 y = heightmap[index];
 618                 if (height < 1.0 && y > river_depth &&
 619                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 620
 621                         for (s16 ry = y; ry != y - river_depth; ry--) {
 622                                 u32 vi = vm->m_area.index(x, ry, z);
 623                                 vm->m_data[vi] = n_air;
 624                         }
 625
 626                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 627                         vm->m_data[vi] = n_water_source;
 628                 }
 629         }
 630 }
 631 #endif
 632
 633
 634 #if 0
 635 void MapgenV7::addTopNodes()
 636 {
 637         v3s16 em = vm->m_area.getExtent();
 638         s16 ntopnodes;
 639         u32 index = 0;
 640
 641         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 642         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 643                 Biome *biome = bmgr->biomes[biomemap[index]];
 644
 645                 //////////////////// First, add top nodes below the ridge
 646                 s16 y = ridge_heightmap[index];
 647
 648                 // This cutoff is good enough, but not perfect.
 649                 // It will cut off potentially placed top nodes at chunk boundaries
 650                 if (y < node_min.Y)
 651                         continue;
 652                 if (y > node_max.Y) {
 653                         y = node_max.Y; // Let's see if we can still go downward anyway
 654                         u32 vi = vm->m_area.index(x, y, z);
 655                         content_t c = vm->m_data[vi].getContent();
 656                         if (ndef->get(c).walkable)
 657                                 continue;
 658                 }
 659
 660                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 661                 // might not be the actual height, just the lowest part in the chunk
 662                 // where a ridge had been carved
 663                 u32 i = vm->m_area.index(x, y, z);
 664                 for (; y >= node_min.Y; y--) {
 665                         content_t c = vm->m_data[i].getContent();
 666                         if (ndef->get(c).walkable)
 667                                 break;
 668                         vm->m_area.add_y(em, i, -1);
 669                 }
 670
 671                 if (y != node_min.Y - 1 && y >= water_level) {
 672                         ridge_heightmap[index] = y; //update ridgeheight
 673                         ntopnodes = biome->top_depth;
 674                         for (; y <= node_max.Y && ntopnodes; y++) {
 675                                 ntopnodes--;
 676                                 vm->m_data[i] = MapNode(biome->c_top);
 677                                 vm->m_area.add_y(em, i, 1);
 678                         }
 679                         // If dirt, grow grass on it.
 680                         if (y > water_level - 10 &&
 681                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 682                                 vm->m_area.add_y(em, i, -1);
 683                                 if (vm->m_data[i].getContent() == c_dirt)
 684                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 685                         }
 686                 }
 687
 688                 //////////////////// Now, add top nodes on top of the ridge
 689                 y = heightmap[index];
 690                 if (y > node_max.Y) {
 691                         y = node_max.Y; // Let's see if we can still go downward anyway
 692                         u32 vi = vm->m_area.index(x, y, z);
 693                         content_t c = vm->m_data[vi].getContent();
 694                         if (ndef->get(c).walkable)
 695                                 continue;
 696                 }
 697
 698                 i = vm->m_area.index(x, y, z);
 699                 for (; y >= node_min.Y; y--) {
 700                         content_t c = vm->m_data[i].getContent();
 701                         if (ndef->get(c).walkable)
 702                                 break;
 703                         vm->m_area.add_y(em, i, -1);
 704                 }
 705
 706                 if (y != node_min.Y - 1) {
 707                         ntopnodes = biome->top_depth;
 708                         // Let's see if we've already added it...
 709                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 710                                 continue;
 711
 712                         for (; y <= node_max.Y && ntopnodes; y++) {
 713                                 ntopnodes--;
 714                                 vm->m_data[i] = MapNode(biome->c_top);
 715                                 vm->m_area.add_y(em, i, 1);
 716                         }
 717                         // If dirt, grow grass on it.
 718                         if (y > water_level - 10 &&
 719                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 720                                 vm->m_area.add_y(em, i, -1);
 721                                 if (vm->m_data[i].getContent() == c_dirt)
 722                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 723                         }
 724                 }
 725         }
 726 }
 727 #endif