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