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         {"biomerepeat", MGV7_BIOMEREPEAT},
  48         {NULL,          0}
  49 };
  50
  51
  52 ///////////////////////////////////////////////////////////////////////////////
  53
  54
  55 MapgenV7::MapgenV7(int mapgenid, MapgenV7Params *params, EmergeManager *emerge)
  56         : MapgenBasic(mapgenid, params, emerge)
  57 {
  58         spflags             = params->spflags;
  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         floatland_level     = params->floatland_level;
  64         shadow_limit        = params->shadow_limit;
  65         cavern_limit        = params->cavern_limit;
  66         cavern_taper        = params->cavern_taper;
  67         cavern_threshold    = params->cavern_threshold;
  68
  69         // This is to avoid a divide-by-zero.
  70         // Parameter will be saved to map_meta.txt in limited form.
  71         params->float_mount_height = MYMAX(params->float_mount_height, 1.0f);
  72         float_mount_height   = params->float_mount_height;
  73
  74         // 2D noise
  75         noise_terrain_base    = new Noise(&params->np_terrain_base,    seed, csize.X, csize.Z);
  76         noise_terrain_alt     = new Noise(&params->np_terrain_alt,     seed, csize.X, csize.Z);
  77         noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
  78         noise_height_select   = new Noise(&params->np_height_select,   seed, csize.X, csize.Z);
  79         noise_filler_depth    = new Noise(&params->np_filler_depth,    seed, csize.X, csize.Z);
  80
  81         if (spflags & MGV7_MOUNTAINS)
  82                 noise_mount_height = new Noise(&params->np_mount_height, seed, csize.X, csize.Z);
  83
  84         if (spflags & MGV7_FLOATLANDS) {
  85                 noise_floatland_base    = new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  86                 noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
  87         }
  88
  89         if (spflags & MGV7_RIDGES) {
  90                 noise_ridge_uwater = new Noise(&params->np_ridge_uwater, seed, csize.X, csize.Z);
  91         // 3D noise, 1-up 1-down overgeneration
  92                 noise_ridge = new Noise(&params->np_ridge, seed, csize.X, csize.Y + 2, csize.Z);
  93         }
  94         // 3D noise, 1 up, 1 down overgeneration
  95         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
  96                 noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  97         // 3D noise, 1 down overgeneration
  98         MapgenBasic::np_cave1  = params->np_cave1;
  99         MapgenBasic::np_cave2  = params->np_cave2;
 100         MapgenBasic::np_cavern = params->np_cavern;
 101 }
 102
 103
 104 MapgenV7::~MapgenV7()
 105 {
 106         delete noise_terrain_base;
 107         delete noise_terrain_alt;
 108         delete noise_terrain_persist;
 109         delete noise_height_select;
 110         delete noise_filler_depth;
 111
 112         if (spflags & MGV7_MOUNTAINS)
 113                 delete noise_mount_height;
 114
 115         if (spflags & MGV7_FLOATLANDS) {
 116                 delete noise_floatland_base;
 117                 delete noise_float_base_height;
 118         }
 119
 120         if (spflags & MGV7_RIDGES) {
 121                 delete noise_ridge_uwater;
 122                 delete noise_ridge;
 123         }
 124
 125         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS))
 126                 delete noise_mountain;
 127 }
 128
 129
 130 MapgenV7Params::MapgenV7Params()
 131 {
 132         np_terrain_base      = NoiseParams(4,    70,   v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 133         np_terrain_alt       = NoiseParams(4,    25,   v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 134         np_terrain_persist   = NoiseParams(0.6,  0.1,  v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 135         np_height_select     = NoiseParams(-8,   16,   v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 136         np_filler_depth      = NoiseParams(0,    1.2,  v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 137         np_mount_height      = NoiseParams(256,  112,  v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 138         np_ridge_uwater      = NoiseParams(0,    1,    v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 139         np_floatland_base    = NoiseParams(-0.6, 1.5,  v3f(600,  600,  600),  114,   5, 0.6,  2.0);
 140         np_float_base_height = NoiseParams(48,   24,   v3f(300,  300,  300),  907,   4, 0.7,  2.0);
 141         np_mountain          = NoiseParams(-0.6, 1,    v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 142         np_ridge             = NoiseParams(0,    1,    v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 143         np_cavern            = NoiseParams(0,    1,    v3f(384,  128,  384),  723,   5, 0.63, 2.0);
 144         np_cave1             = NoiseParams(0,    12,   v3f(61,   61,   61),   52534, 3, 0.5,  2.0);
 145         np_cave2             = NoiseParams(0,    12,   v3f(67,   67,   67),   10325, 3, 0.5,  2.0);
 146 }
 147
 148
 149 void MapgenV7Params::readParams(const Settings *settings)
 150 {
 151         settings->getFlagStrNoEx("mgv7_spflags",           spflags, flagdesc_mapgen_v7);
 152         settings->getFloatNoEx("mgv7_cave_width",          cave_width);
 153         settings->getS16NoEx("mgv7_large_cave_depth",      large_cave_depth);
 154         settings->getS16NoEx("mgv7_lava_depth",            lava_depth);
 155         settings->getFloatNoEx("mgv7_float_mount_density", float_mount_density);
 156         settings->getFloatNoEx("mgv7_float_mount_height",  float_mount_height);
 157         settings->getS16NoEx("mgv7_floatland_level",       floatland_level);
 158         settings->getS16NoEx("mgv7_shadow_limit",          shadow_limit);
 159         settings->getS16NoEx("mgv7_cavern_limit",          cavern_limit);
 160         settings->getS16NoEx("mgv7_cavern_taper",          cavern_taper);
 161         settings->getFloatNoEx("mgv7_cavern_threshold",    cavern_threshold);
 162
 163         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 164         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 165         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 166         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 167         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 168         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 169         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 170         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 171         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 172         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 173         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 174         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 175         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 176         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 177 }
 178
 179
 180 void MapgenV7Params::writeParams(Settings *settings) const
 181 {
 182         settings->setFlagStr("mgv7_spflags",           spflags, flagdesc_mapgen_v7, U32_MAX);
 183         settings->setFloat("mgv7_cave_width",          cave_width);
 184         settings->setS16("mgv7_large_cave_depth",      large_cave_depth);
 185         settings->setS16("mgv7_lava_depth",            lava_depth);
 186         settings->setFloat("mgv7_float_mount_density", float_mount_density);
 187         settings->setFloat("mgv7_float_mount_height",  float_mount_height);
 188         settings->setS16("mgv7_floatland_level",       floatland_level);
 189         settings->setS16("mgv7_shadow_limit",          shadow_limit);
 190         settings->setS16("mgv7_cavern_limit",          cavern_limit);
 191         settings->setS16("mgv7_cavern_taper",          cavern_taper);
 192         settings->setFloat("mgv7_cavern_threshold",    cavern_threshold);
 193
 194         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 195         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 196         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 197         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 198         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 199         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 200         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 201         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 202         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 203         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 204         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 205         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 206         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 207         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 208 }
 209
 210
 211 ///////////////////////////////////////////////////////////////////////////////
 212
 213
 214 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 215 {
 216         // If rivers are enabled, first check if in a river
 217         if (spflags & MGV7_RIDGES) {
 218                 float width = 0.2;
 219                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 220                 if (fabs(uwatern) <= width)
 221                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 222         }
 223
 224         // Terrain noise 'offset' is the average level of that terrain.
 225         // At least 50% of terrain will be below the higher of base and alt terrain
 226         // 'offset's.
 227         // Raising the maximum spawn level above 'water_level + 16' is necessary
 228         // for when terrain 'offset's are set much higher than water_level.
 229         s16 max_spawn_y = MYMAX(MYMAX(noise_terrain_alt->np.offset,
 230                         noise_terrain_base->np.offset),
 231                         water_level + 16);
 232         // Base terrain calculation
 233         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 234
 235         // If mountains are disabled, terrain level is base terrain level.
 236         // Avoids mid-air spawn where mountain terrain would have been.
 237         if (!(spflags & MGV7_MOUNTAINS)) {
 238                 if (y <= water_level || y > max_spawn_y)
 239                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 240                 else
 241                         // + 1 to not be half-buried in a potential node-deep biome 'dust'
 242                         return y + 1;
 243         }
 244
 245         // Search upwards for first node without mountain terrain
 246         int iters = 256;
 247         while (iters > 0 && y <= max_spawn_y) {
 248                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // If air above
 249                         if (y <= water_level || y > max_spawn_y)
 250                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 251                         else
 252                                 return y + 1;
 253                 }
 254                 y++;
 255                 iters--;
 256         }
 257
 258         // Unsuitable spawn point
 259         return MAX_MAP_GENERATION_LIMIT;
 260 }
 261
 262
 263 void MapgenV7::makeChunk(BlockMakeData *data)
 264 {
 265         // Pre-conditions
 266         assert(data->vmanip);
 267         assert(data->nodedef);
 268         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 269                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 270                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 271         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 272                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 273                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 274
 275         this->generating = true;
 276         this->vm   = data->vmanip;
 277         this->ndef = data->nodedef;
 278         //TimeTaker t("makeChunk");
 279
 280         v3s16 blockpos_min = data->blockpos_min;
 281         v3s16 blockpos_max = data->blockpos_max;
 282         node_min = blockpos_min * MAP_BLOCKSIZE;
 283         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 284         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 285         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 286
 287         blockseed = getBlockSeed2(full_node_min, seed);
 288
 289         // Get zero level for biomes and decorations
 290         // Optionally repeat surface biomes in floatlands
 291         s16 biome_zero_level = ((spflags & MGV7_FLOATLANDS) &&
 292                 (spflags & MGV7_BIOMEREPEAT) && node_max.Y >= shadow_limit) ?
 293                 floatland_level - 1 : water_level - 1;
 294
 295         // Generate base and mountain terrain
 296         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 297         s16 stone_surface_max_y = generateTerrain();
 298
 299         // Generate rivers
 300         if (spflags & MGV7_RIDGES)
 301                 generateRidgeTerrain();
 302
 303         // Create heightmap
 304         updateHeightmap(node_min, node_max);
 305
 306         // Init biome generator, place biome-specific nodes, and build biomemap
 307         biomegen->calcBiomeNoise(node_min);
 308         MgStoneType stone_type = generateBiomes(biome_zero_level);
 309
 310         // Generate caverns, tunnels and classic caves
 311         if (flags & MG_CAVES) {
 312                 bool near_cavern = false;
 313                 // Generate caverns
 314                 if (spflags & MGV7_CAVERNS)
 315                         near_cavern = generateCaverns(stone_surface_max_y);
 316                 // Generate tunnels and classic caves
 317                 if (near_cavern)
 318                         // Disable classic caves in this mapchunk by setting
 319                         // 'large cave depth' to world base. Avoids excessive liquid in
 320                         // large caverns and floating blobs of overgenerated liquid.
 321                         generateCaves(stone_surface_max_y, -MAX_MAP_GENERATION_LIMIT);
 322                 else
 323                         generateCaves(stone_surface_max_y, large_cave_depth);
 324         }
 325
 326         // Generate dungeons
 327         if (flags & MG_DUNGEONS)
 328                 generateDungeons(stone_surface_max_y, stone_type);
 329
 330         // Generate the registered decorations
 331         if (flags & MG_DECORATIONS)
 332                 m_emerge->decomgr->placeAllDecos(this, blockseed,
 333                         node_min, node_max, biome_zero_level);
 334
 335         // Generate the registered ores
 336         m_emerge->oremgr->placeAllOres(this, blockseed,
 337                 node_min, node_max, water_level - 1);
 338
 339         // Sprinkle some dust on top after everything else was generated
 340         dustTopNodes();
 341
 342         //printf("makeChunk: %dms\n", t.stop());
 343
 344         // Update liquids
 345         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 346
 347         // Calculate lighting
 348         // Limit floatland shadow
 349         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 350                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 351
 352         if (flags & MG_LIGHT)
 353                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 354                         full_node_min, full_node_max, propagate_shadow);
 355
 356         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 357         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 358
 359         this->generating = false;
 360 }
 361
 362
 363 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 364 {
 365         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 366         hselect = rangelim(hselect, 0.0, 1.0);
 367
 368         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 369
 370         noise_terrain_base->np.persist = persist;
 371         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 372
 373         noise_terrain_alt->np.persist = persist;
 374         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 375
 376         if (height_alt > height_base)
 377                 return height_alt;
 378
 379         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 380 }
 381
 382
 383 float MapgenV7::baseTerrainLevelFromMap(int index)
 384 {
 385         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 386         float height_base = noise_terrain_base->result[index];
 387         float height_alt  = noise_terrain_alt->result[index];
 388
 389         if (height_alt > height_base)
 390                 return height_alt;
 391
 392         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 393 }
 394
 395
 396 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 397 {
 398         float mnt_h_n =
 399                         MYMAX(NoisePerlin2D(&noise_mount_height->np, x, z, seed), 1.0f);
 400         float density_gradient = -((float)y / mnt_h_n);
 401         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 402
 403         return mnt_n + density_gradient >= 0.0;
 404 }
 405
 406
 407 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 408 {
 409         float mounthn = MYMAX(noise_mount_height->result[idx_xz], 1.0f);
 410         float density_gradient = -((float)y / mounthn);
 411         float mountn = noise_mountain->result[idx_xyz];
 412
 413         return mountn + density_gradient >= 0.0;
 414 }
 415
 416
 417 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 418 {
 419         // Make rim 2 nodes thick to match floatland base terrain
 420         float density_gradient = (y >= floatland_level) ?
 421                 -pow((float)(y - floatland_level) / float_mount_height, 0.75f) :
 422                 -pow((float)(floatland_level - 1 - y) / float_mount_height, 0.75f);
 423
 424         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 425
 426         return floatn + density_gradient >= 0.0f;
 427 }
 428
 429
 430 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
 431 {
 432         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 433         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 434         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 435
 436         float n_base = noise_floatland_base->result[idx_xz];
 437         if (n_base > 0.0f) {
 438                 float n_base_height =
 439                                 MYMAX(noise_float_base_height->result[idx_xz], 1.0f);
 440                 float amp = n_base * n_base_height;
 441                 float ridge = n_base_height / 3.0f;
 442                 base_min = floatland_level - amp / 1.5f;
 443
 444                 if (amp > ridge * 2.0f) {
 445                         // Lake bed
 446                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 447                 } else {
 448                         // Hills and ridges
 449                         float diff = fabs(amp - ridge) / ridge;
 450                         // Smooth ridges using the 'smoothstep function'
 451                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 452                         base_max = floatland_level + ridge - smooth_diff * ridge;
 453                 }
 454         }
 455
 456         *float_base_min = base_min;
 457         *float_base_max = base_max;
 458 }
 459
 460
 461 int MapgenV7::generateTerrain()
 462 {
 463         MapNode n_air(CONTENT_AIR);
 464         MapNode n_stone(c_stone);
 465         MapNode n_water(c_water_source);
 466
 467         //// Calculate noise for terrain generation
 468         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 469         float *persistmap = noise_terrain_persist->result;
 470
 471         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 472         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 473         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 474
 475         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 476                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 477         }
 478
 479         if (spflags & MGV7_MOUNTAINS) {
 480                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 481         }
 482
 483         if (spflags & MGV7_FLOATLANDS) {
 484                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 485                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 486         }
 487
 488         //// Place nodes
 489         v3s16 em = vm->m_area.getExtent();
 490         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 491         u32 index2d = 0;
 492
 493         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 494         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 495                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 496                 if (surface_y > stone_surface_max_y)
 497                         stone_surface_max_y = surface_y;
 498
 499                 // Get extent of floatland base terrain
 500                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 501                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 502                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 503                 if (spflags & MGV7_FLOATLANDS)
 504                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 505
 506                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 507                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 508
 509                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 510                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 511                                 if (y <= surface_y) {
 512                                         vm->m_data[vi] = n_stone;  // Base terrain
 513                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 514                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 515                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 516                                         if (y > stone_surface_max_y)
 517                                                 stone_surface_max_y = y;
 518                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 519                                                 ((y >= float_base_min && y <= float_base_max) ||
 520                                                 getFloatlandMountainFromMap(index3d, index2d, y))) {
 521                                         vm->m_data[vi] = n_stone;  // Floatland terrain
 522                                         stone_surface_max_y = node_max.Y;
 523                                 } else if (y <= water_level) {
 524                                         vm->m_data[vi] = n_water;  // Ground level water
 525                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 526                                                 (y >= float_base_max && y <= floatland_level)) {
 527                                         vm->m_data[vi] = n_water;  // Floatland water
 528                                 } else {
 529                                         vm->m_data[vi] = n_air;
 530                                 }
 531                         }
 532                         vm->m_area.add_y(em, vi, 1);
 533                         index3d += ystride;
 534                 }
 535         }
 536
 537         return stone_surface_max_y;
 538 }
 539
 540
 541 void MapgenV7::generateRidgeTerrain()
 542 {
 543         if (node_max.Y < water_level - 16 ||
 544                         ((spflags & MGV7_FLOATLANDS) && node_max.Y > shadow_limit))
 545                 return;
 546
 547         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 548         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 549
 550         MapNode n_water(c_water_source);
 551         MapNode n_air(CONTENT_AIR);
 552         u32 index = 0;
 553         float width = 0.2;
 554
 555         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 556         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 557                 u32 vi = vm->m_area.index(node_min.X, y, z);
 558                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 559                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 560
 561                         float uwatern = noise_ridge_uwater->result[j] * 2;
 562                         if (fabs(uwatern) > width)
 563                                 continue;
 564
 565                         float altitude = y - water_level;
 566                         float height_mod = (altitude + 17) / 2.5;
 567                         float width_mod  = width - fabs(uwatern);
 568                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 569
 570                         if (nridge + width_mod * height_mod < 0.6)
 571                                 continue;
 572
 573                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 574                 }
 575         }
 576 }
 577
 578
 579 ////////////////////////////////////////////////////////////////////////////////
 580 //// Code Boneyard
 581 ////
 582 //// Much of the stuff here has potential to become useful again at some point
 583 //// in the future, but we don't want it to get lost or forgotten in version
 584 //// control.
 585 ////
 586
 587 #if 0
 588 int MapgenV7::generateMountainTerrain(s16 ymax)
 589 {
 590         MapNode n_stone(c_stone);
 591         u32 j = 0;
 592
 593         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 594         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 595                 u32 vi = vm->m_area.index(node_min.X, y, z);
 596                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 597                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 598                         content_t c = vm->m_data[vi].getContent();
 599
 600                         if (getMountainTerrainFromMap(j, index, y)
 601                                         && (c == CONTENT_AIR || c == c_water_source)) {
 602                                 vm->m_data[vi] = n_stone;
 603                                 if (y > ymax)
 604                                         ymax = y;
 605                         }
 606
 607                         vi++;
 608                         j++;
 609                 }
 610         }
 611
 612         return ymax;
 613 }
 614 #endif
 615
 616
 617 #if 0
 618 void MapgenV7::carveRivers() {
 619         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 620         MapNode n_stone(c_stone);
 621         u32 index = 0;
 622
 623         int river_depth = 4;
 624
 625         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 626         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 627                 float terrain_mod  = noise_terrain_mod->result[index];
 628                 NoiseParams *np = noise_terrain_river->np;
 629                 np.persist = noise_terrain_persist->result[index];
 630                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 631                 float height = terrain_river * (1 - abs(terrain_mod)) *
 632                                                 noise_terrain_river->np.scale;
 633                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 634
 635                 s16 y = heightmap[index];
 636                 if (height < 1.0 && y > river_depth &&
 637                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 638
 639                         for (s16 ry = y; ry != y - river_depth; ry--) {
 640                                 u32 vi = vm->m_area.index(x, ry, z);
 641                                 vm->m_data[vi] = n_air;
 642                         }
 643
 644                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 645                         vm->m_data[vi] = n_water_source;
 646                 }
 647         }
 648 }
 649 #endif
 650
 651
 652 #if 0
 653 void MapgenV7::addTopNodes()
 654 {
 655         v3s16 em = vm->m_area.getExtent();
 656         s16 ntopnodes;
 657         u32 index = 0;
 658
 659         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 660         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 661                 Biome *biome = bmgr->biomes[biomemap[index]];
 662
 663                 //////////////////// First, add top nodes below the ridge
 664                 s16 y = ridge_heightmap[index];
 665
 666                 // This cutoff is good enough, but not perfect.
 667                 // It will cut off potentially placed top nodes at chunk boundaries
 668                 if (y < node_min.Y)
 669                         continue;
 670                 if (y > node_max.Y) {
 671                         y = node_max.Y; // Let's see if we can still go downward anyway
 672                         u32 vi = vm->m_area.index(x, y, z);
 673                         content_t c = vm->m_data[vi].getContent();
 674                         if (ndef->get(c).walkable)
 675                                 continue;
 676                 }
 677
 678                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 679                 // might not be the actual height, just the lowest part in the chunk
 680                 // where a ridge had been carved
 681                 u32 i = vm->m_area.index(x, y, z);
 682                 for (; y >= node_min.Y; y--) {
 683                         content_t c = vm->m_data[i].getContent();
 684                         if (ndef->get(c).walkable)
 685                                 break;
 686                         vm->m_area.add_y(em, i, -1);
 687                 }
 688
 689                 if (y != node_min.Y - 1 && y >= water_level) {
 690                         ridge_heightmap[index] = y; //update ridgeheight
 691                         ntopnodes = biome->top_depth;
 692                         for (; y <= node_max.Y && ntopnodes; y++) {
 693                                 ntopnodes--;
 694                                 vm->m_data[i] = MapNode(biome->c_top);
 695                                 vm->m_area.add_y(em, i, 1);
 696                         }
 697                         // If dirt, grow grass on it.
 698                         if (y > water_level - 10 &&
 699                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 700                                 vm->m_area.add_y(em, i, -1);
 701                                 if (vm->m_data[i].getContent() == c_dirt)
 702                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 703                         }
 704                 }
 705
 706                 //////////////////// Now, add top nodes on top of the ridge
 707                 y = heightmap[index];
 708                 if (y > node_max.Y) {
 709                         y = node_max.Y; // Let's see if we can still go downward anyway
 710                         u32 vi = vm->m_area.index(x, y, z);
 711                         content_t c = vm->m_data[vi].getContent();
 712                         if (ndef->get(c).walkable)
 713                                 continue;
 714                 }
 715
 716                 i = vm->m_area.index(x, y, z);
 717                 for (; y >= node_min.Y; y--) {
 718                         content_t c = vm->m_data[i].getContent();
 719                         if (ndef->get(c).walkable)
 720                                 break;
 721                         vm->m_area.add_y(em, i, -1);
 722                 }
 723
 724                 if (y != node_min.Y - 1) {
 725                         ntopnodes = biome->top_depth;
 726                         // Let's see if we've already added it...
 727                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 728                                 continue;
 729
 730                         for (; y <= node_max.Y && ntopnodes; y++) {
 731                                 ntopnodes--;
 732                                 vm->m_data[i] = MapNode(biome->c_top);
 733                                 vm->m_area.add_y(em, i, 1);
 734                         }
 735                         // If dirt, grow grass on it.
 736                         if (y > water_level - 10 &&
 737                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 738                                 vm->m_area.add_y(em, i, -1);
 739                                 if (vm->m_data[i].getContent() == c_dirt)
 740                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 741                         }
 742                 }
 743         }
 744 }
 745 #endif