src/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2010-2015 paramat, Matt Gregory
   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 "treegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_v7.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_v7[] = {
  44         {"mountains",  MGV7_MOUNTAINS},
  45         {"ridges",     MGV7_RIDGES},
  46         {"floatlands", MGV7_FLOATLANDS},
  47         {"caverns",    MGV7_CAVERNS},
  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         this->spflags             = params->spflags;
  59         this->cave_width          = params->cave_width;
  60         this->float_mount_density = params->float_mount_density;
  61         this->float_mount_height  = params->float_mount_height;
  62         this->floatland_level     = params->floatland_level;
  63         this->shadow_limit        = params->shadow_limit;
  64         this->cavern_limit        = params->cavern_limit;
  65         this->cavern_taper        = params->cavern_taper;
  66         this->cavern_threshold    = params->cavern_threshold;
  67
  68         //// Terrain noise
  69         noise_terrain_base      = new Noise(&params->np_terrain_base,      seed, csize.X, csize.Z);
  70         noise_terrain_alt       = new Noise(&params->np_terrain_alt,       seed, csize.X, csize.Z);
  71         noise_terrain_persist   = new Noise(&params->np_terrain_persist,   seed, csize.X, csize.Z);
  72         noise_height_select     = new Noise(&params->np_height_select,     seed, csize.X, csize.Z);
  73         noise_filler_depth      = new Noise(&params->np_filler_depth,      seed, csize.X, csize.Z);
  74         noise_mount_height      = new Noise(&params->np_mount_height,      seed, csize.X, csize.Z);
  75         noise_ridge_uwater      = new Noise(&params->np_ridge_uwater,      seed, csize.X, csize.Z);
  76         noise_floatland_base    = new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  77         noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
  78
  79         //// 3d terrain noise
  80         // 1-up 1-down overgeneration
  81         noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  82         noise_ridge    = new Noise(&params->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  83         // 1 down overgeneration
  84         MapgenBasic::np_cave1  = params->np_cave1;
  85         MapgenBasic::np_cave2  = params->np_cave2;
  86         MapgenBasic::np_cavern = params->np_cavern;
  87 }
  88
  89
  90 MapgenV7::~MapgenV7()
  91 {
  92         delete noise_terrain_base;
  93         delete noise_terrain_persist;
  94         delete noise_height_select;
  95         delete noise_terrain_alt;
  96         delete noise_filler_depth;
  97         delete noise_mount_height;
  98         delete noise_ridge_uwater;
  99         delete noise_floatland_base;
 100         delete noise_float_base_height;
 101         delete noise_mountain;
 102         delete noise_ridge;
 103 }
 104
 105
 106 MapgenV7Params::MapgenV7Params()
 107 {
 108         spflags             = MGV7_MOUNTAINS | MGV7_RIDGES | MGV7_CAVERNS;
 109         cave_width          = 0.09;
 110         float_mount_density = 0.6;
 111         float_mount_height  = 128.0;
 112         floatland_level     = 1280;
 113         shadow_limit        = 1024;
 114         cavern_limit        = -256;
 115         cavern_taper        = 256;
 116         cavern_threshold    = 0.7;
 117
 118         np_terrain_base      = NoiseParams(4,    70,   v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 119         np_terrain_alt       = NoiseParams(4,    25,   v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 120         np_terrain_persist   = NoiseParams(0.6,  0.1,  v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 121         np_height_select     = NoiseParams(-8,   16,   v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 122         np_filler_depth      = NoiseParams(0,    1.2,  v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 123         np_mount_height      = NoiseParams(256,  112,  v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 124         np_ridge_uwater      = NoiseParams(0,    1,    v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 125         np_floatland_base    = NoiseParams(-0.6, 1.5,  v3f(600,  600,  600),  114,   5, 0.6,  2.0);
 126         np_float_base_height = NoiseParams(48,   24,   v3f(300,  300,  300),  907,   4, 0.7,  2.0);
 127         np_mountain          = NoiseParams(-0.6, 1,    v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 128         np_ridge             = NoiseParams(0,    1,    v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 129         np_cavern            = NoiseParams(0,    1,    v3f(384,  128,  384),  723,   5, 0.63, 2.0);
 130         np_cave1             = NoiseParams(0,    12,   v3f(61,   61,   61),   52534, 3, 0.5,  2.0);
 131         np_cave2             = NoiseParams(0,    12,   v3f(67,   67,   67),   10325, 3, 0.5,  2.0);
 132 }
 133
 134
 135 void MapgenV7Params::readParams(const Settings *settings)
 136 {
 137         settings->getFlagStrNoEx("mgv7_spflags",           spflags, flagdesc_mapgen_v7);
 138         settings->getFloatNoEx("mgv7_cave_width",          cave_width);
 139         settings->getFloatNoEx("mgv7_float_mount_density", float_mount_density);
 140         settings->getFloatNoEx("mgv7_float_mount_height",  float_mount_height);
 141         settings->getS16NoEx("mgv7_floatland_level",       floatland_level);
 142         settings->getS16NoEx("mgv7_shadow_limit",          shadow_limit);
 143         settings->getS16NoEx("mgv7_cavern_limit",          cavern_limit);
 144         settings->getS16NoEx("mgv7_cavern_taper",          cavern_taper);
 145         settings->getFloatNoEx("mgv7_cavern_threshold",    cavern_threshold);
 146
 147         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 148         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 149         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 150         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 151         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 152         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 153         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 154         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 155         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 156         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 157         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 158         settings->getNoiseParams("mgv7_np_cavern",            np_cavern);
 159         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 160         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 161 }
 162
 163
 164 void MapgenV7Params::writeParams(Settings *settings) const
 165 {
 166         settings->setFlagStr("mgv7_spflags",           spflags, flagdesc_mapgen_v7, U32_MAX);
 167         settings->setFloat("mgv7_cave_width",          cave_width);
 168         settings->setFloat("mgv7_float_mount_density", float_mount_density);
 169         settings->setFloat("mgv7_float_mount_height",  float_mount_height);
 170         settings->setS16("mgv7_floatland_level",       floatland_level);
 171         settings->setS16("mgv7_shadow_limit",          shadow_limit);
 172         settings->setS16("mgv7_cavern_limit",          cavern_limit);
 173         settings->setS16("mgv7_cavern_taper",          cavern_taper);
 174         settings->setFloat("mgv7_cavern_threshold",    cavern_threshold);
 175
 176         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 177         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 178         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 179         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 180         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 181         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 182         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 183         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 184         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 185         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 186         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 187         settings->setNoiseParams("mgv7_np_cavern",            np_cavern);
 188         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 189         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 190 }
 191
 192
 193 ///////////////////////////////////////////////////////////////////////////////
 194
 195
 196 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 197 {
 198         // Base terrain calculation
 199         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 200
 201         // If enabled, check if inside a river
 202         if (spflags & MGV7_RIDGES) {
 203                 float width = 0.2;
 204                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 205                 if (fabs(uwatern) <= width)
 206                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 207         }
 208
 209         // If mountains are disabled, terrain level is base terrain level
 210         // Avoids spawn on non-existant mountain terrain
 211         if (!(spflags & MGV7_MOUNTAINS)) {
 212                 if (y <= water_level || y > water_level + 16)
 213                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 214                 else
 215                         return y;
 216         }
 217
 218         // Mountain terrain calculation
 219         int iters = 128;
 220         while (iters--) {
 221                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // If air above
 222                         if (y <= water_level || y > water_level + 16)
 223                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 224                         else
 225                                 return y;
 226                 }
 227                 y++;
 228         }
 229
 230         // Unsuitable spawn point, no mountain surface found
 231         return MAX_MAP_GENERATION_LIMIT;
 232 }
 233
 234
 235 void MapgenV7::makeChunk(BlockMakeData *data)
 236 {
 237         // Pre-conditions
 238         assert(data->vmanip);
 239         assert(data->nodedef);
 240         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 241                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 242                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 243         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 244                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 245                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 246
 247         this->generating = true;
 248         this->vm   = data->vmanip;
 249         this->ndef = data->nodedef;
 250         //TimeTaker t("makeChunk");
 251
 252         v3s16 blockpos_min = data->blockpos_min;
 253         v3s16 blockpos_max = data->blockpos_max;
 254         node_min = blockpos_min * MAP_BLOCKSIZE;
 255         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 256         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 257         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 258
 259         blockseed = getBlockSeed2(full_node_min, seed);
 260
 261         // Generate base and mountain terrain
 262         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 263         s16 stone_surface_max_y = generateTerrain();
 264
 265         // Generate rivers
 266         if (spflags & MGV7_RIDGES)
 267                 generateRidgeTerrain();
 268
 269         // Create heightmap
 270         updateHeightmap(node_min, node_max);
 271
 272         // Init biome generator, place biome-specific nodes, and build biomemap
 273         biomegen->calcBiomeNoise(node_min);
 274         MgStoneType stone_type = generateBiomes();
 275
 276         // Generate caverns, tunnels and classic caves
 277         if (flags & MG_CAVES) {
 278                 bool has_cavern = false;
 279                 // Generate caverns
 280                 if (spflags & MGV7_CAVERNS)
 281                         has_cavern = generateCaverns(stone_surface_max_y);
 282                 // Generate tunnels and classic caves
 283                 if (has_cavern)
 284                         // Disable classic caves in this mapchunk by setting
 285                         // 'large cave depth' to world base. Avoids excessive liquid in
 286                         // large caverns and floating blobs of overgenerated liquid.
 287                         generateCaves(stone_surface_max_y, -MAX_MAP_GENERATION_LIMIT);
 288                 else
 289                         generateCaves(stone_surface_max_y, water_level);
 290         }
 291
 292         // Generate dungeons
 293         if (flags & MG_DUNGEONS)
 294                 generateDungeons(stone_surface_max_y, stone_type);
 295
 296         // Generate the registered decorations
 297         if (flags & MG_DECORATIONS)
 298                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 299
 300         // Generate the registered ores
 301         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 302
 303         // Sprinkle some dust on top after everything else was generated
 304         dustTopNodes();
 305
 306         //printf("makeChunk: %dms\n", t.stop());
 307
 308         // Update liquids
 309         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 310
 311         // Calculate lighting
 312         // Limit floatland shadow
 313         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 314                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 315
 316         if (flags & MG_LIGHT)
 317                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 318                         full_node_min, full_node_max, propagate_shadow);
 319
 320         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 321         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 322
 323         this->generating = false;
 324 }
 325
 326
 327 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 328 {
 329         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 330         hselect = rangelim(hselect, 0.0, 1.0);
 331
 332         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 333
 334         noise_terrain_base->np.persist = persist;
 335         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 336
 337         noise_terrain_alt->np.persist = persist;
 338         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 339
 340         if (height_alt > height_base)
 341                 return height_alt;
 342
 343         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 344 }
 345
 346
 347 float MapgenV7::baseTerrainLevelFromMap(int index)
 348 {
 349         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 350         float height_base = noise_terrain_base->result[index];
 351         float height_alt  = noise_terrain_alt->result[index];
 352
 353         if (height_alt > height_base)
 354                 return height_alt;
 355
 356         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 357 }
 358
 359
 360 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 361 {
 362         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 363         float density_gradient = -((float)y / mnt_h_n);
 364         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 365
 366         return mnt_n + density_gradient >= 0.0;
 367 }
 368
 369
 370 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 371 {
 372         float mounthn = noise_mount_height->result[idx_xz];
 373         float density_gradient = -((float)y / mounthn);
 374         float mountn = noise_mountain->result[idx_xyz];
 375
 376         return mountn + density_gradient >= 0.0;
 377 }
 378
 379
 380 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 381 {
 382         // Make rim 2 nodes thick to match floatland base terrain
 383         float density_gradient = (y >= floatland_level) ?
 384                 -pow((float)(y - floatland_level) / float_mount_height, 0.75f) :
 385                 -pow((float)(floatland_level - 1 - y) / float_mount_height, 0.75f);
 386
 387         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 388
 389         return floatn + density_gradient >= 0.0f;
 390 }
 391
 392
 393 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
 394 {
 395         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 396         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 397         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 398
 399         float n_base = noise_floatland_base->result[idx_xz];
 400         if (n_base > 0.0f) {
 401                 float n_base_height = noise_float_base_height->result[idx_xz];
 402                 float amp = n_base * n_base_height;
 403                 float ridge = n_base_height / 3.0f;
 404                 base_min = floatland_level - amp / 1.5f;
 405
 406                 if (amp > ridge * 2.0f) {
 407                         // Lake bed
 408                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 409                 } else {
 410                         // Hills and ridges
 411                         float diff = fabs(amp - ridge) / ridge;
 412                         // Smooth ridges using the 'smoothstep function'
 413                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 414                         base_max = floatland_level + ridge - smooth_diff * ridge;
 415                 }
 416         }
 417
 418         *float_base_min = base_min;
 419         *float_base_max = base_max;
 420 }
 421
 422
 423 int MapgenV7::generateTerrain()
 424 {
 425         MapNode n_air(CONTENT_AIR);
 426         MapNode n_stone(c_stone);
 427         MapNode n_water(c_water_source);
 428
 429         //// Calculate noise for terrain generation
 430         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 431         float *persistmap = noise_terrain_persist->result;
 432
 433         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 434         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 435         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 436
 437         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 438                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 439         }
 440
 441         if (spflags & MGV7_MOUNTAINS) {
 442                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 443         }
 444
 445         if (spflags & MGV7_FLOATLANDS) {
 446                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 447                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 448         }
 449
 450         //// Place nodes
 451         v3s16 em = vm->m_area.getExtent();
 452         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 453         u32 index2d = 0;
 454
 455         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 456         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 457                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 458                 if (surface_y > stone_surface_max_y)
 459                         stone_surface_max_y = surface_y;
 460
 461                 // Get extent of floatland base terrain
 462                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 463                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 464                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 465                 if (spflags & MGV7_FLOATLANDS)
 466                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 467
 468                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 469                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 470
 471                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 472                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 473                                 if (y <= surface_y) {
 474                                         vm->m_data[vi] = n_stone;  // Base terrain
 475                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 476                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 477                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 478                                         if (y > stone_surface_max_y)
 479                                                 stone_surface_max_y = y;
 480                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 481                                                 ((y >= float_base_min && y <= float_base_max) ||
 482                                                 getFloatlandMountainFromMap(index3d, index2d, y))) {
 483                                         vm->m_data[vi] = n_stone;  // Floatland terrain
 484                                         stone_surface_max_y = node_max.Y;
 485                                 } else if (y <= water_level) {
 486                                         vm->m_data[vi] = n_water;  // Ground level water
 487                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 488                                                 (y >= float_base_max && y <= floatland_level)) {
 489                                         vm->m_data[vi] = n_water;  // Floatland water
 490                                 } else {
 491                                         vm->m_data[vi] = n_air;
 492                                 }
 493                         }
 494                         vm->m_area.add_y(em, vi, 1);
 495                         index3d += ystride;
 496                 }
 497         }
 498
 499         return stone_surface_max_y;
 500 }
 501
 502
 503 void MapgenV7::generateRidgeTerrain()
 504 {
 505         if ((node_max.Y < water_level - 16) || (node_max.Y > shadow_limit))
 506                 return;
 507
 508         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 509         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 510
 511         MapNode n_water(c_water_source);
 512         MapNode n_air(CONTENT_AIR);
 513         u32 index = 0;
 514         float width = 0.2;
 515
 516         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 517         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 518                 u32 vi = vm->m_area.index(node_min.X, y, z);
 519                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 520                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 521
 522                         float uwatern = noise_ridge_uwater->result[j] * 2;
 523                         if (fabs(uwatern) > width)
 524                                 continue;
 525
 526                         float altitude = y - water_level;
 527                         float height_mod = (altitude + 17) / 2.5;
 528                         float width_mod  = width - fabs(uwatern);
 529                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 530
 531                         if (nridge + width_mod * height_mod < 0.6)
 532                                 continue;
 533
 534                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 535                 }
 536         }
 537 }
 538
 539
 540 ////////////////////////////////////////////////////////////////////////////////
 541 //// Code Boneyard
 542 ////
 543 //// Much of the stuff here has potential to become useful again at some point
 544 //// in the future, but we don't want it to get lost or forgotten in version
 545 //// control.
 546 ////
 547
 548 #if 0
 549 int MapgenV7::generateMountainTerrain(s16 ymax)
 550 {
 551         MapNode n_stone(c_stone);
 552         u32 j = 0;
 553
 554         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 555         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 556                 u32 vi = vm->m_area.index(node_min.X, y, z);
 557                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 558                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 559                         content_t c = vm->m_data[vi].getContent();
 560
 561                         if (getMountainTerrainFromMap(j, index, y)
 562                                         && (c == CONTENT_AIR || c == c_water_source)) {
 563                                 vm->m_data[vi] = n_stone;
 564                                 if (y > ymax)
 565                                         ymax = y;
 566                         }
 567
 568                         vi++;
 569                         j++;
 570                 }
 571         }
 572
 573         return ymax;
 574 }
 575 #endif
 576
 577
 578 #if 0
 579 void MapgenV7::carveRivers() {
 580         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 581         MapNode n_stone(c_stone);
 582         u32 index = 0;
 583
 584         int river_depth = 4;
 585
 586         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 587         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 588                 float terrain_mod  = noise_terrain_mod->result[index];
 589                 NoiseParams *np = noise_terrain_river->np;
 590                 np.persist = noise_terrain_persist->result[index];
 591                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 592                 float height = terrain_river * (1 - abs(terrain_mod)) *
 593                                                 noise_terrain_river->np.scale;
 594                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 595
 596                 s16 y = heightmap[index];
 597                 if (height < 1.0 && y > river_depth &&
 598                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 599
 600                         for (s16 ry = y; ry != y - river_depth; ry--) {
 601                                 u32 vi = vm->m_area.index(x, ry, z);
 602                                 vm->m_data[vi] = n_air;
 603                         }
 604
 605                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 606                         vm->m_data[vi] = n_water_source;
 607                 }
 608         }
 609 }
 610 #endif
 611
 612
 613 #if 0
 614 void MapgenV7::addTopNodes()
 615 {
 616         v3s16 em = vm->m_area.getExtent();
 617         s16 ntopnodes;
 618         u32 index = 0;
 619
 620         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 621         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 622                 Biome *biome = bmgr->biomes[biomemap[index]];
 623
 624                 //////////////////// First, add top nodes below the ridge
 625                 s16 y = ridge_heightmap[index];
 626
 627                 // This cutoff is good enough, but not perfect.
 628                 // It will cut off potentially placed top nodes at chunk boundaries
 629                 if (y < node_min.Y)
 630                         continue;
 631                 if (y > node_max.Y) {
 632                         y = node_max.Y; // Let's see if we can still go downward anyway
 633                         u32 vi = vm->m_area.index(x, y, z);
 634                         content_t c = vm->m_data[vi].getContent();
 635                         if (ndef->get(c).walkable)
 636                                 continue;
 637                 }
 638
 639                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 640                 // might not be the actual height, just the lowest part in the chunk
 641                 // where a ridge had been carved
 642                 u32 i = vm->m_area.index(x, y, z);
 643                 for (; y >= node_min.Y; y--) {
 644                         content_t c = vm->m_data[i].getContent();
 645                         if (ndef->get(c).walkable)
 646                                 break;
 647                         vm->m_area.add_y(em, i, -1);
 648                 }
 649
 650                 if (y != node_min.Y - 1 && y >= water_level) {
 651                         ridge_heightmap[index] = y; //update ridgeheight
 652                         ntopnodes = biome->top_depth;
 653                         for (; y <= node_max.Y && ntopnodes; y++) {
 654                                 ntopnodes--;
 655                                 vm->m_data[i] = MapNode(biome->c_top);
 656                                 vm->m_area.add_y(em, i, 1);
 657                         }
 658                         // If dirt, grow grass on it.
 659                         if (y > water_level - 10 &&
 660                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 661                                 vm->m_area.add_y(em, i, -1);
 662                                 if (vm->m_data[i].getContent() == c_dirt)
 663                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 664                         }
 665                 }
 666
 667                 //////////////////// Now, add top nodes on top of the ridge
 668                 y = heightmap[index];
 669                 if (y > node_max.Y) {
 670                         y = node_max.Y; // Let's see if we can still go downward anyway
 671                         u32 vi = vm->m_area.index(x, y, z);
 672                         content_t c = vm->m_data[vi].getContent();
 673                         if (ndef->get(c).walkable)
 674                                 continue;
 675                 }
 676
 677                 i = vm->m_area.index(x, y, z);
 678                 for (; y >= node_min.Y; y--) {
 679                         content_t c = vm->m_data[i].getContent();
 680                         if (ndef->get(c).walkable)
 681                                 break;
 682                         vm->m_area.add_y(em, i, -1);
 683                 }
 684
 685                 if (y != node_min.Y - 1) {
 686                         ntopnodes = biome->top_depth;
 687                         // Let's see if we've already added it...
 688                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 689                                 continue;
 690
 691                         for (; y <= node_max.Y && ntopnodes; y++) {
 692                                 ntopnodes--;
 693                                 vm->m_data[i] = MapNode(biome->c_top);
 694                                 vm->m_area.add_y(em, i, 1);
 695                         }
 696                         // If dirt, grow grass on it.
 697                         if (y > water_level - 10 &&
 698                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 699                                 vm->m_area.add_y(em, i, -1);
 700                                 if (vm->m_data[i].getContent() == c_dirt)
 701                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 702                         }
 703                 }
 704         }
 705 }
 706 #endif