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         {NULL,           0}
  48 };
  49
  50
  51 ///////////////////////////////////////////////////////////////////////////////
  52
  53
  54 MapgenV7::MapgenV7(int mapgenid, MapgenV7Params *params, EmergeManager *emerge)
  55         : MapgenBasic(mapgenid, params, emerge)
  56 {
  57         this->spflags             = params->spflags;
  58         this->cave_width          = params->cave_width;
  59         this->float_mount_density = params->float_mount_density;
  60         this->float_mount_height  = params->float_mount_height;
  61         this->floatland_level     = params->floatland_level;
  62         this->shadow_limit        = params->shadow_limit;
  63
  64         //// Terrain noise
  65         noise_terrain_base      = new Noise(&params->np_terrain_base,      seed, csize.X, csize.Z);
  66         noise_terrain_alt       = new Noise(&params->np_terrain_alt,       seed, csize.X, csize.Z);
  67         noise_terrain_persist   = new Noise(&params->np_terrain_persist,   seed, csize.X, csize.Z);
  68         noise_height_select     = new Noise(&params->np_height_select,     seed, csize.X, csize.Z);
  69         noise_filler_depth      = new Noise(&params->np_filler_depth,      seed, csize.X, csize.Z);
  70         noise_mount_height      = new Noise(&params->np_mount_height,      seed, csize.X, csize.Z);
  71         noise_ridge_uwater      = new Noise(&params->np_ridge_uwater,      seed, csize.X, csize.Z);
  72         noise_floatland_base    = new Noise(&params->np_floatland_base,    seed, csize.X, csize.Z);
  73         noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);
  74
  75         //// 3d terrain noise
  76         // 1-up 1-down overgeneration
  77         noise_mountain = new Noise(&params->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  78         noise_ridge    = new Noise(&params->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  79
  80         MapgenBasic::np_cave1 = params->np_cave1;
  81         MapgenBasic::np_cave2 = params->np_cave2;
  82 }
  83
  84
  85 MapgenV7::~MapgenV7()
  86 {
  87         delete noise_terrain_base;
  88         delete noise_terrain_persist;
  89         delete noise_height_select;
  90         delete noise_terrain_alt;
  91         delete noise_filler_depth;
  92         delete noise_mount_height;
  93         delete noise_ridge_uwater;
  94         delete noise_floatland_base;
  95         delete noise_float_base_height;
  96         delete noise_mountain;
  97         delete noise_ridge;
  98 }
  99
 100
 101 MapgenV7Params::MapgenV7Params()
 102 {
 103         spflags             = MGV7_MOUNTAINS | MGV7_RIDGES;
 104         cave_width          = 0.09;
 105         float_mount_density = 0.6;
 106         float_mount_height  = 128.0;
 107         floatland_level     = 1280;
 108         shadow_limit        = 1024;
 109
 110         np_terrain_base      = NoiseParams(4,    70,   v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 111         np_terrain_alt       = NoiseParams(4,    25,   v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 112         np_terrain_persist   = NoiseParams(0.6,  0.1,  v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 113         np_height_select     = NoiseParams(-8,   16,   v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 114         np_filler_depth      = NoiseParams(0,    1.2,  v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 115         np_mount_height      = NoiseParams(256,  112,  v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 116         np_ridge_uwater      = NoiseParams(0,    1,    v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 117         np_floatland_base    = NoiseParams(-0.6, 1.5,  v3f(600,  600,  600),  114,   5, 0.6,  2.0);
 118         np_float_base_height = NoiseParams(48,   24,   v3f(300,  300,  300),  907,   4, 0.7,  2.0);
 119         np_mountain          = NoiseParams(-0.6, 1,    v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 120         np_ridge             = NoiseParams(0,    1,    v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 121         np_cave1             = NoiseParams(0,    12,   v3f(61,   61,   61),   52534, 3, 0.5,  2.0);
 122         np_cave2             = NoiseParams(0,    12,   v3f(67,   67,   67),   10325, 3, 0.5,  2.0);
 123 }
 124
 125
 126 void MapgenV7Params::readParams(const Settings *settings)
 127 {
 128         settings->getFlagStrNoEx("mgv7_spflags",           spflags, flagdesc_mapgen_v7);
 129         settings->getFloatNoEx("mgv7_cave_width",          cave_width);
 130         settings->getFloatNoEx("mgv7_float_mount_density", float_mount_density);
 131         settings->getFloatNoEx("mgv7_float_mount_height",  float_mount_height);
 132         settings->getS16NoEx("mgv7_floatland_level",       floatland_level);
 133         settings->getS16NoEx("mgv7_shadow_limit",          shadow_limit);
 134
 135         settings->getNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 136         settings->getNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 137         settings->getNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 138         settings->getNoiseParams("mgv7_np_height_select",     np_height_select);
 139         settings->getNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 140         settings->getNoiseParams("mgv7_np_mount_height",      np_mount_height);
 141         settings->getNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 142         settings->getNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 143         settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 144         settings->getNoiseParams("mgv7_np_mountain",          np_mountain);
 145         settings->getNoiseParams("mgv7_np_ridge",             np_ridge);
 146         settings->getNoiseParams("mgv7_np_cave1",             np_cave1);
 147         settings->getNoiseParams("mgv7_np_cave2",             np_cave2);
 148 }
 149
 150
 151 void MapgenV7Params::writeParams(Settings *settings) const
 152 {
 153         settings->setFlagStr("mgv7_spflags",           spflags, flagdesc_mapgen_v7, U32_MAX);
 154         settings->setFloat("mgv7_cave_width",          cave_width);
 155         settings->setFloat("mgv7_float_mount_density", float_mount_density);
 156         settings->setFloat("mgv7_float_mount_height",  float_mount_height);
 157         settings->setS16("mgv7_floatland_level",       floatland_level);
 158         settings->setS16("mgv7_shadow_limit",          shadow_limit);
 159
 160         settings->setNoiseParams("mgv7_np_terrain_base",      np_terrain_base);
 161         settings->setNoiseParams("mgv7_np_terrain_alt",       np_terrain_alt);
 162         settings->setNoiseParams("mgv7_np_terrain_persist",   np_terrain_persist);
 163         settings->setNoiseParams("mgv7_np_height_select",     np_height_select);
 164         settings->setNoiseParams("mgv7_np_filler_depth",      np_filler_depth);
 165         settings->setNoiseParams("mgv7_np_mount_height",      np_mount_height);
 166         settings->setNoiseParams("mgv7_np_ridge_uwater",      np_ridge_uwater);
 167         settings->setNoiseParams("mgv7_np_floatland_base",    np_floatland_base);
 168         settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
 169         settings->setNoiseParams("mgv7_np_mountain",          np_mountain);
 170         settings->setNoiseParams("mgv7_np_ridge",             np_ridge);
 171         settings->setNoiseParams("mgv7_np_cave1",             np_cave1);
 172         settings->setNoiseParams("mgv7_np_cave2",             np_cave2);
 173 }
 174
 175
 176 ///////////////////////////////////////////////////////////////////////////////
 177
 178
 179 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 180 {
 181         // Base terrain calculation
 182         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 183
 184         // If enabled, check if inside a river
 185         if (spflags & MGV7_RIDGES) {
 186                 float width = 0.2;
 187                 float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 188                 if (fabs(uwatern) <= width)
 189                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 190         }
 191
 192         // If mountains are disabled, terrain level is base terrain level
 193         // Avoids spawn on non-existant mountain terrain
 194         if (!(spflags & MGV7_MOUNTAINS)) {
 195                 if (y <= water_level || y > water_level + 16)
 196                         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 197                 else
 198                         return y;
 199         }
 200
 201         // Mountain terrain calculation
 202         int iters = 128;
 203         while (iters--) {
 204                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // If air above
 205                         if (y <= water_level || y > water_level + 16)
 206                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 207                         else
 208                                 return y;
 209                 }
 210                 y++;
 211         }
 212
 213         // Unsuitable spawn point, no mountain surface found
 214         return MAX_MAP_GENERATION_LIMIT;
 215 }
 216
 217
 218 void MapgenV7::makeChunk(BlockMakeData *data)
 219 {
 220         // Pre-conditions
 221         assert(data->vmanip);
 222         assert(data->nodedef);
 223         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 224                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 225                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 226         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 227                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 228                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 229
 230         this->generating = true;
 231         this->vm   = data->vmanip;
 232         this->ndef = data->nodedef;
 233         //TimeTaker t("makeChunk");
 234
 235         v3s16 blockpos_min = data->blockpos_min;
 236         v3s16 blockpos_max = data->blockpos_max;
 237         node_min = blockpos_min * MAP_BLOCKSIZE;
 238         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 239         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 240         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 241
 242         blockseed = getBlockSeed2(full_node_min, seed);
 243
 244         // Generate base and mountain terrain
 245         // An initial heightmap is no longer created here for use in generateRidgeTerrain()
 246         s16 stone_surface_max_y = generateTerrain();
 247
 248         // Generate rivers
 249         if (spflags & MGV7_RIDGES)
 250                 generateRidgeTerrain();
 251
 252         // Create heightmap
 253         updateHeightmap(node_min, node_max);
 254
 255         // Init biome generator, place biome-specific nodes, and build biomemap
 256         biomegen->calcBiomeNoise(node_min);
 257         MgStoneType stone_type = generateBiomes();
 258
 259         if (flags & MG_CAVES)
 260                 generateCaves(stone_surface_max_y, water_level);
 261
 262         if (flags & MG_DUNGEONS)
 263                 generateDungeons(stone_surface_max_y, stone_type);
 264
 265         // Generate the registered decorations
 266         if (flags & MG_DECORATIONS)
 267                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 268
 269         // Generate the registered ores
 270         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 271
 272         // Sprinkle some dust on top after everything else was generated
 273         dustTopNodes();
 274
 275         //printf("makeChunk: %dms\n", t.stop());
 276
 277         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 278
 279         // Limit floatland shadow
 280         bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
 281                 node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);
 282
 283         if (flags & MG_LIGHT)
 284                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 285                         full_node_min, full_node_max, propagate_shadow);
 286
 287         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 288         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 289
 290         this->generating = false;
 291 }
 292
 293
 294 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 295 {
 296         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 297         hselect = rangelim(hselect, 0.0, 1.0);
 298
 299         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 300
 301         noise_terrain_base->np.persist = persist;
 302         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 303
 304         noise_terrain_alt->np.persist = persist;
 305         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 306
 307         if (height_alt > height_base)
 308                 return height_alt;
 309
 310         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 311 }
 312
 313
 314 float MapgenV7::baseTerrainLevelFromMap(int index)
 315 {
 316         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 317         float height_base = noise_terrain_base->result[index];
 318         float height_alt  = noise_terrain_alt->result[index];
 319
 320         if (height_alt > height_base)
 321                 return height_alt;
 322
 323         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 324 }
 325
 326
 327 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 328 {
 329         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 330         float density_gradient = -((float)y / mnt_h_n);
 331         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 332
 333         return mnt_n + density_gradient >= 0.0;
 334 }
 335
 336
 337 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 338 {
 339         float mounthn = noise_mount_height->result[idx_xz];
 340         float density_gradient = -((float)y / mounthn);
 341         float mountn = noise_mountain->result[idx_xyz];
 342
 343         return mountn + density_gradient >= 0.0;
 344 }
 345
 346
 347 bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
 348 {
 349         // Make rim 2 nodes thick to match floatland base terrain
 350         float density_gradient = (y >= floatland_level) ?
 351                 -pow((float)(y - floatland_level) / float_mount_height, 0.75f) :
 352                 -pow((float)(floatland_level - 1 - y) / float_mount_height, 0.75f);
 353
 354         float floatn = noise_mountain->result[idx_xyz] + float_mount_density;
 355
 356         return floatn + density_gradient >= 0.0f;
 357 }
 358
 359
 360 void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
 361 {
 362         // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 363         s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
 364         s16 base_max = MAX_MAP_GENERATION_LIMIT;
 365
 366         float n_base = noise_floatland_base->result[idx_xz];
 367         if (n_base > 0.0f) {
 368                 float n_base_height = noise_float_base_height->result[idx_xz];
 369                 float amp = n_base * n_base_height;
 370                 float ridge = n_base_height / 3.0f;
 371                 base_min = floatland_level - amp / 1.5f;
 372
 373                 if (amp > ridge * 2.0f) {
 374                         // Lake bed
 375                         base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
 376                 } else {
 377                         // Hills and ridges
 378                         float diff = fabs(amp - ridge) / ridge;
 379                         // Smooth ridges using the 'smoothstep function'
 380                         float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
 381                         base_max = floatland_level + ridge - smooth_diff * ridge;
 382                 }
 383         }
 384
 385         *float_base_min = base_min;
 386         *float_base_max = base_max;
 387 }
 388
 389
 390 int MapgenV7::generateTerrain()
 391 {
 392         MapNode n_air(CONTENT_AIR);
 393         MapNode n_stone(c_stone);
 394         MapNode n_water(c_water_source);
 395
 396         //// Calculate noise for terrain generation
 397         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 398         float *persistmap = noise_terrain_persist->result;
 399
 400         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 401         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 402         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 403
 404         if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
 405                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 406         }
 407
 408         if (spflags & MGV7_MOUNTAINS) {
 409                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 410         }
 411
 412         if (spflags & MGV7_FLOATLANDS) {
 413                 noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
 414                 noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
 415         }
 416
 417         //// Place nodes
 418         v3s16 em = vm->m_area.getExtent();
 419         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 420         u32 index2d = 0;
 421
 422         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 423         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 424                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 425                 if (surface_y > stone_surface_max_y)
 426                         stone_surface_max_y = surface_y;
 427
 428                 // Get extent of floatland base terrain
 429                 // '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
 430                 s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
 431                 s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
 432                 if (spflags & MGV7_FLOATLANDS)
 433                         floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);
 434
 435                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 436                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 437
 438                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 439                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 440                                 if (y <= surface_y) {
 441                                         vm->m_data[vi] = n_stone;  // Base terrain
 442                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 443                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 444                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 445                                         if (y > stone_surface_max_y)
 446                                                 stone_surface_max_y = y;
 447                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 448                                                 ((y >= float_base_min && y <= float_base_max) ||
 449                                                 getFloatlandMountainFromMap(index3d, index2d, y))) {
 450                                         vm->m_data[vi] = n_stone;  // Floatland terrain
 451                                         stone_surface_max_y = node_max.Y;
 452                                 } else if (y <= water_level) {
 453                                         vm->m_data[vi] = n_water;  // Ground level water
 454                                 } else if ((spflags & MGV7_FLOATLANDS) &&
 455                                                 (y >= float_base_max && y <= floatland_level)) {
 456                                         vm->m_data[vi] = n_water;  // Floatland water
 457                                 } else {
 458                                         vm->m_data[vi] = n_air;
 459                                 }
 460                         }
 461                         vm->m_area.add_y(em, vi, 1);
 462                         index3d += ystride;
 463                 }
 464         }
 465
 466         return stone_surface_max_y;
 467 }
 468
 469
 470 void MapgenV7::generateRidgeTerrain()
 471 {
 472         if ((node_max.Y < water_level - 16) || (node_max.Y > shadow_limit))
 473                 return;
 474
 475         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 476         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 477
 478         MapNode n_water(c_water_source);
 479         MapNode n_air(CONTENT_AIR);
 480         u32 index = 0;
 481         float width = 0.2;
 482
 483         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 484         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 485                 u32 vi = vm->m_area.index(node_min.X, y, z);
 486                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 487                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 488
 489                         float uwatern = noise_ridge_uwater->result[j] * 2;
 490                         if (fabs(uwatern) > width)
 491                                 continue;
 492
 493                         float altitude = y - water_level;
 494                         float height_mod = (altitude + 17) / 2.5;
 495                         float width_mod  = width - fabs(uwatern);
 496                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 497
 498                         if (nridge + width_mod * height_mod < 0.6)
 499                                 continue;
 500
 501                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 502                 }
 503         }
 504 }
 505
 506
 507 ////////////////////////////////////////////////////////////////////////////////
 508 //// Code Boneyard
 509 ////
 510 //// Much of the stuff here has potential to become useful again at some point
 511 //// in the future, but we don't want it to get lost or forgotten in version
 512 //// control.
 513 ////
 514
 515 #if 0
 516 int MapgenV7::generateMountainTerrain(s16 ymax)
 517 {
 518         MapNode n_stone(c_stone);
 519         u32 j = 0;
 520
 521         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 522         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 523                 u32 vi = vm->m_area.index(node_min.X, y, z);
 524                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 525                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 526                         content_t c = vm->m_data[vi].getContent();
 527
 528                         if (getMountainTerrainFromMap(j, index, y)
 529                                         && (c == CONTENT_AIR || c == c_water_source)) {
 530                                 vm->m_data[vi] = n_stone;
 531                                 if (y > ymax)
 532                                         ymax = y;
 533                         }
 534
 535                         vi++;
 536                         j++;
 537                 }
 538         }
 539
 540         return ymax;
 541 }
 542 #endif
 543
 544
 545 #if 0
 546 void MapgenV7::carveRivers() {
 547         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 548         MapNode n_stone(c_stone);
 549         u32 index = 0;
 550
 551         int river_depth = 4;
 552
 553         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 554         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 555                 float terrain_mod  = noise_terrain_mod->result[index];
 556                 NoiseParams *np = noise_terrain_river->np;
 557                 np.persist = noise_terrain_persist->result[index];
 558                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 559                 float height = terrain_river * (1 - abs(terrain_mod)) *
 560                                                 noise_terrain_river->np.scale;
 561                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 562
 563                 s16 y = heightmap[index];
 564                 if (height < 1.0 && y > river_depth &&
 565                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 566
 567                         for (s16 ry = y; ry != y - river_depth; ry--) {
 568                                 u32 vi = vm->m_area.index(x, ry, z);
 569                                 vm->m_data[vi] = n_air;
 570                         }
 571
 572                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 573                         vm->m_data[vi] = n_water_source;
 574                 }
 575         }
 576 }
 577 #endif
 578
 579
 580 #if 0
 581 void MapgenV7::addTopNodes()
 582 {
 583         v3s16 em = vm->m_area.getExtent();
 584         s16 ntopnodes;
 585         u32 index = 0;
 586
 587         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 588         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 589                 Biome *biome = bmgr->biomes[biomemap[index]];
 590
 591                 //////////////////// First, add top nodes below the ridge
 592                 s16 y = ridge_heightmap[index];
 593
 594                 // This cutoff is good enough, but not perfect.
 595                 // It will cut off potentially placed top nodes at chunk boundaries
 596                 if (y < node_min.Y)
 597                         continue;
 598                 if (y > node_max.Y) {
 599                         y = node_max.Y; // Let's see if we can still go downward anyway
 600                         u32 vi = vm->m_area.index(x, y, z);
 601                         content_t c = vm->m_data[vi].getContent();
 602                         if (ndef->get(c).walkable)
 603                                 continue;
 604                 }
 605
 606                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 607                 // might not be the actual height, just the lowest part in the chunk
 608                 // where a ridge had been carved
 609                 u32 i = vm->m_area.index(x, y, z);
 610                 for (; y >= node_min.Y; y--) {
 611                         content_t c = vm->m_data[i].getContent();
 612                         if (ndef->get(c).walkable)
 613                                 break;
 614                         vm->m_area.add_y(em, i, -1);
 615                 }
 616
 617                 if (y != node_min.Y - 1 && y >= water_level) {
 618                         ridge_heightmap[index] = y; //update ridgeheight
 619                         ntopnodes = biome->top_depth;
 620                         for (; y <= node_max.Y && ntopnodes; y++) {
 621                                 ntopnodes--;
 622                                 vm->m_data[i] = MapNode(biome->c_top);
 623                                 vm->m_area.add_y(em, i, 1);
 624                         }
 625                         // If dirt, grow grass on it.
 626                         if (y > water_level - 10 &&
 627                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 628                                 vm->m_area.add_y(em, i, -1);
 629                                 if (vm->m_data[i].getContent() == c_dirt)
 630                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 631                         }
 632                 }
 633
 634                 //////////////////// Now, add top nodes on top of the ridge
 635                 y = heightmap[index];
 636                 if (y > node_max.Y) {
 637                         y = node_max.Y; // Let's see if we can still go downward anyway
 638                         u32 vi = vm->m_area.index(x, y, z);
 639                         content_t c = vm->m_data[vi].getContent();
 640                         if (ndef->get(c).walkable)
 641                                 continue;
 642                 }
 643
 644                 i = vm->m_area.index(x, y, z);
 645                 for (; y >= node_min.Y; y--) {
 646                         content_t c = vm->m_data[i].getContent();
 647                         if (ndef->get(c).walkable)
 648                                 break;
 649                         vm->m_area.add_y(em, i, -1);
 650                 }
 651
 652                 if (y != node_min.Y - 1) {
 653                         ntopnodes = biome->top_depth;
 654                         // Let's see if we've already added it...
 655                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 656                                 continue;
 657
 658                         for (; y <= node_max.Y && ntopnodes; y++) {
 659                                 ntopnodes--;
 660                                 vm->m_data[i] = MapNode(biome->c_top);
 661                                 vm->m_area.add_y(em, i, 1);
 662                         }
 663                         // If dirt, grow grass on it.
 664                         if (y > water_level - 10 &&
 665                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 666                                 vm->m_area.add_y(em, i, -1);
 667                                 if (vm->m_data[i].getContent() == c_dirt)
 668                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 669                         }
 670                 }
 671         }
 672 }
 673 #endif