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