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         {NULL,        0}
  47 };
  48
  49
  50 ///////////////////////////////////////////////////////////////////////////////
  51
  52
  53 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  54         : MapgenBasic(mapgenid, params, emerge)
  55 {
  56         this->m_emerge = emerge;
  57         this->bmgr     = emerge->biomemgr;
  58
  59         //// amount of elements to skip for the next index
  60         //// for noise/height/biome maps (not vmanip)
  61         this->ystride = csize.X;
  62         // 1-up 1-down overgeneration
  63         this->zstride_1u1d = csize.X * (csize.Y + 2);
  64
  65         this->heightmap       = new s16[csize.X * csize.Z];
  66         this->ridge_heightmap = new s16[csize.X * csize.Z];
  67
  68         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  69
  70         this->spflags    = sp->spflags;
  71         this->cave_width = sp->cave_width;
  72
  73         //// Terrain noise
  74         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  75         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  76         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  77         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  78         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  79         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  80         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  81
  82         //// 3d terrain noise
  83         // 1-up 1-down overgeneration
  84         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  85         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  86
  87         MapgenBasic::np_cave1 = sp->np_cave1;
  88         MapgenBasic::np_cave2 = sp->np_cave2;
  89
  90         // TODO(hmmmm): should we have a way to disable biomemanager biomes?
  91         //// Initialize biome generator
  92         biomegen = emerge->biomemgr->createBiomeGen(
  93                 BIOMEGEN_ORIGINAL, params->bparams, csize);
  94         biomemap = biomegen->biomemap;
  95
  96         //// Resolve nodes to be used
  97         c_stone                = ndef->getId("mapgen_stone");
  98         c_water_source         = ndef->getId("mapgen_water_source");
  99         c_lava_source          = ndef->getId("mapgen_lava_source");
 100         c_desert_stone         = ndef->getId("mapgen_desert_stone");
 101         c_ice                  = ndef->getId("mapgen_ice");
 102         c_sandstone            = ndef->getId("mapgen_sandstone");
 103
 104         c_cobble               = ndef->getId("mapgen_cobble");
 105         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 106         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 107         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 108         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 109
 110         if (c_ice == CONTENT_IGNORE)
 111                 c_ice = CONTENT_AIR;
 112         if (c_mossycobble == CONTENT_IGNORE)
 113                 c_mossycobble = c_cobble;
 114         if (c_stair_cobble == CONTENT_IGNORE)
 115                 c_stair_cobble = c_cobble;
 116         if (c_sandstonebrick == CONTENT_IGNORE)
 117                 c_sandstonebrick = c_sandstone;
 118         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 119                 c_stair_sandstonebrick = c_sandstone;
 120 }
 121
 122
 123 MapgenV7::~MapgenV7()
 124 {
 125         delete noise_terrain_base;
 126         delete noise_terrain_persist;
 127         delete noise_height_select;
 128         delete noise_terrain_alt;
 129         delete noise_filler_depth;
 130         delete noise_mount_height;
 131         delete noise_ridge_uwater;
 132         delete noise_mountain;
 133         delete noise_ridge;
 134
 135         delete biomegen;
 136
 137         delete[] ridge_heightmap;
 138         delete[] heightmap;
 139 }
 140
 141
 142 MapgenV7Params::MapgenV7Params()
 143 {
 144         spflags    = MGV7_MOUNTAINS | MGV7_RIDGES;
 145         cave_width = 0.3;
 146
 147         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 148         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 149         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 150         np_height_select   = NoiseParams(-8,   16,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 151         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 152         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 153         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 154         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 155         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 156         np_cave1           = NoiseParams(0,    12,  v3f(96,   96,   96),   52534, 4, 0.5,  2.0);
 157         np_cave2           = NoiseParams(0,    12,  v3f(96,   96,   96),   10325, 4, 0.5,  2.0);
 158 }
 159
 160
 161 void MapgenV7Params::readParams(const Settings *settings)
 162 {
 163         settings->getFlagStrNoEx("mgv7_spflags",  spflags, flagdesc_mapgen_v7);
 164         settings->getFloatNoEx("mgv7_cave_width", cave_width);
 165
 166         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 167         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 168         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 169         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 170         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 171         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 172         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 173         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 174         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 175         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 176         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 177 }
 178
 179
 180 void MapgenV7Params::writeParams(Settings *settings) const
 181 {
 182         settings->setFlagStr("mgv7_spflags",  spflags, flagdesc_mapgen_v7, U32_MAX);
 183         settings->setFloat("mgv7_cave_width", cave_width);
 184
 185         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 186         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 187         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 188         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 189         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 190         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 191         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 192         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 193         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 194         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 195         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 196 }
 197
 198
 199 ///////////////////////////////////////////////////////////////////////////////
 200
 201
 202 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 203 {
 204         // Base terrain calculation
 205         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 206
 207         // Ridge/river terrain calculation
 208         float width = 0.2;
 209         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 210         // if inside a river this is an unsuitable spawn point
 211         if (fabs(uwatern) <= width)
 212                 return MAX_MAP_GENERATION_LIMIT;
 213
 214         // Mountain terrain calculation
 215         int iters = 128;
 216         while (iters--) {
 217                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // Air, y is ground level
 218                         if (y <= water_level || y > water_level + 16)
 219                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 220                         else
 221                                 return y;
 222                 }
 223                 y++;
 224         }
 225
 226         // Unsuitable spawn point, no ground surface found
 227         return MAX_MAP_GENERATION_LIMIT;
 228 }
 229
 230
 231 void MapgenV7::makeChunk(BlockMakeData *data)
 232 {
 233         // Pre-conditions
 234         assert(data->vmanip);
 235         assert(data->nodedef);
 236         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 237                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 238                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 239         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 240                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 241                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 242
 243         this->generating = true;
 244         this->vm   = data->vmanip;
 245         this->ndef = data->nodedef;
 246         //TimeTaker t("makeChunk");
 247
 248         v3s16 blockpos_min = data->blockpos_min;
 249         v3s16 blockpos_max = data->blockpos_max;
 250         node_min = blockpos_min * MAP_BLOCKSIZE;
 251         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 252         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 253         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 254
 255         blockseed = getBlockSeed2(full_node_min, seed);
 256
 257         // Make some noise
 258         calculateNoise();
 259
 260         // Generate terrain and ridges with initial heightmaps
 261         s16 stone_surface_max_y = generateTerrain();
 262
 263         if (spflags & MGV7_RIDGES)
 264                 generateRidgeTerrain();
 265
 266         // Update heightmap to include mountain terrain
 267         updateHeightmap(node_min, node_max);
 268
 269         // Init biome generator, place biome-specific nodes, and build biomemap
 270         biomegen->calcBiomeNoise(node_min);
 271         biomegen->getBiomes(heightmap);
 272         MgStoneType stone_type = generateBiomes();
 273
 274         if (flags & MG_CAVES)
 275                 generateCaves(stone_surface_max_y, water_level);
 276
 277         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 278                 DungeonParams dp;
 279
 280                 dp.np_rarity  = nparams_dungeon_rarity;
 281                 dp.np_density = nparams_dungeon_density;
 282                 dp.np_wetness = nparams_dungeon_wetness;
 283                 dp.c_water    = c_water_source;
 284                 if (stone_type == MGSTONE_STONE) {
 285                         dp.c_cobble = c_cobble;
 286                         dp.c_moss   = c_mossycobble;
 287                         dp.c_stair  = c_stair_cobble;
 288
 289                         dp.diagonal_dirs = false;
 290                         dp.mossratio     = 3.0;
 291                         dp.holesize      = v3s16(1, 2, 1);
 292                         dp.roomsize      = v3s16(0, 0, 0);
 293                         dp.notifytype    = GENNOTIFY_DUNGEON;
 294                 } else if (stone_type == MGSTONE_DESERT_STONE) {
 295                         dp.c_cobble = c_desert_stone;
 296                         dp.c_moss   = c_desert_stone;
 297                         dp.c_stair  = c_desert_stone;
 298
 299                         dp.diagonal_dirs = true;
 300                         dp.mossratio     = 0.0;
 301                         dp.holesize      = v3s16(2, 3, 2);
 302                         dp.roomsize      = v3s16(2, 5, 2);
 303                         dp.notifytype    = GENNOTIFY_TEMPLE;
 304                 } else if (stone_type == MGSTONE_SANDSTONE) {
 305                         dp.c_cobble = c_sandstonebrick;
 306                         dp.c_moss   = c_sandstonebrick;
 307                         dp.c_stair  = c_sandstonebrick;
 308
 309                         dp.diagonal_dirs = false;
 310                         dp.mossratio     = 0.0;
 311                         dp.holesize      = v3s16(2, 2, 2);
 312                         dp.roomsize      = v3s16(2, 0, 2);
 313                         dp.notifytype    = GENNOTIFY_DUNGEON;
 314                 }
 315
 316                 DungeonGen dgen(this, &dp);
 317                 dgen.generate(blockseed, full_node_min, full_node_max);
 318         }
 319
 320         // Generate the registered decorations
 321         if (flags & MG_DECORATIONS)
 322                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 323
 324         // Generate the registered ores
 325         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 326
 327         // Sprinkle some dust on top after everything else was generated
 328         dustTopNodes();
 329
 330         //printf("makeChunk: %dms\n", t.stop());
 331
 332         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 333
 334         if (flags & MG_LIGHT)
 335                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 336                         full_node_min, full_node_max);
 337
 338         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 339         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 340
 341         this->generating = false;
 342 }
 343
 344
 345 void MapgenV7::calculateNoise()
 346 {
 347         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 348         s16 x = node_min.X;
 349         s16 y = node_min.Y - 1;
 350         s16 z = node_min.Z;
 351
 352         noise_terrain_persist->perlinMap2D(x, z);
 353         float *persistmap = noise_terrain_persist->result;
 354
 355         noise_terrain_base->perlinMap2D(x, z, persistmap);
 356         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 357         noise_height_select->perlinMap2D(x, z);
 358
 359         if (spflags & MGV7_MOUNTAINS) {
 360                 noise_mountain->perlinMap3D(x, y, z);
 361                 noise_mount_height->perlinMap2D(x, z);
 362         }
 363
 364         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 365                 noise_ridge->perlinMap3D(x, y, z);
 366                 noise_ridge_uwater->perlinMap2D(x, z);
 367         }
 368
 369         // Cave noises are calculated in generateCaves()
 370         // only if solid terrain is present in mapchunk
 371
 372         //printf("calculateNoise: %dus\n", t.stop());
 373 }
 374
 375
 376 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 377 {
 378         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 379         hselect = rangelim(hselect, 0.0, 1.0);
 380
 381         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 382
 383         noise_terrain_base->np.persist = persist;
 384         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 385
 386         noise_terrain_alt->np.persist = persist;
 387         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 388
 389         if (height_alt > height_base)
 390                 return height_alt;
 391
 392         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 393 }
 394
 395
 396 float MapgenV7::baseTerrainLevelFromMap(int index)
 397 {
 398         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 399         float height_base = noise_terrain_base->result[index];
 400         float height_alt  = noise_terrain_alt->result[index];
 401
 402         if (height_alt > height_base)
 403                 return height_alt;
 404
 405         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 406 }
 407
 408
 409 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 410 {
 411         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 412         float density_gradient = -((float)y / mnt_h_n);
 413         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 414
 415         return mnt_n + density_gradient >= 0.0;
 416 }
 417
 418
 419 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 420 {
 421         float mounthn = noise_mount_height->result[idx_xz];
 422         float density_gradient = -((float)y / mounthn);
 423         float mountn = noise_mountain->result[idx_xyz];
 424
 425         return mountn + density_gradient >= 0.0;
 426 }
 427
 428
 429 int MapgenV7::generateTerrain()
 430 {
 431         MapNode n_air(CONTENT_AIR);
 432         MapNode n_stone(c_stone);
 433         MapNode n_water(c_water_source);
 434
 435         v3s16 em = vm->m_area.getExtent();
 436         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 437         u32 index2d = 0;
 438         bool mountain_flag = spflags & MGV7_MOUNTAINS;
 439
 440         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 441         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 442                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 443                 heightmap[index2d]       = surface_y;  // Create base terrain heightmap
 444                 ridge_heightmap[index2d] = surface_y;
 445
 446                 if (surface_y > stone_surface_max_y)
 447                         stone_surface_max_y = surface_y;
 448
 449                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 450                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 451
 452                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 453                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 454                                 if (y <= surface_y) {
 455                                         vm->m_data[vi] = n_stone;  // Base terrain
 456                                 } else if (mountain_flag &&
 457                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 458                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 459                                         if (y > stone_surface_max_y)
 460                                                 stone_surface_max_y = y;
 461                                 } else if (y <= water_level) {
 462                                         vm->m_data[vi] = n_water;
 463                                 } else {
 464                                         vm->m_data[vi] = n_air;
 465                                 }
 466                         }
 467                         vm->m_area.add_y(em, vi, 1);
 468                         index3d += ystride;
 469                 }
 470         }
 471
 472         return stone_surface_max_y;
 473 }
 474
 475
 476 void MapgenV7::generateRidgeTerrain()
 477 {
 478         if (node_max.Y < water_level - 16)
 479                 return;
 480
 481         MapNode n_water(c_water_source);
 482         MapNode n_air(CONTENT_AIR);
 483         u32 index = 0;
 484         float width = 0.2;
 485
 486         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 487         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 488                 u32 vi = vm->m_area.index(node_min.X, y, z);
 489                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 490                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 491
 492                         if (heightmap[j] < water_level - 16)  // Use base terrain heightmap
 493                                 continue;
 494
 495                         float uwatern = noise_ridge_uwater->result[j] * 2;
 496                         if (fabs(uwatern) > width)
 497                                 continue;
 498
 499                         float altitude = y - water_level;
 500                         float height_mod = (altitude + 17) / 2.5;
 501                         float width_mod  = width - fabs(uwatern);
 502                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 503
 504                         if (nridge + width_mod * height_mod < 0.6)
 505                                 continue;
 506
 507                         if (y < ridge_heightmap[j])
 508                                 ridge_heightmap[j] = y - 1;
 509
 510                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 511                 }
 512         }
 513 }
 514
 515
 516 ////////////////////////////////////////////////////////////////////////////////
 517 //// Code Boneyard
 518 ////
 519 //// Much of the stuff here has potential to become useful again at some point
 520 //// in the future, but we don't want it to get lost or forgotten in version
 521 //// control.
 522 ////
 523
 524 #if 0
 525 int MapgenV7::generateMountainTerrain(s16 ymax)
 526 {
 527         MapNode n_stone(c_stone);
 528         u32 j = 0;
 529
 530         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 531         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 532                 u32 vi = vm->m_area.index(node_min.X, y, z);
 533                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 534                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 535                         content_t c = vm->m_data[vi].getContent();
 536
 537                         if (getMountainTerrainFromMap(j, index, y)
 538                                         && (c == CONTENT_AIR || c == c_water_source)) {
 539                                 vm->m_data[vi] = n_stone;
 540                                 if (y > ymax)
 541                                         ymax = y;
 542                         }
 543
 544                         vi++;
 545                         j++;
 546                 }
 547         }
 548
 549         return ymax;
 550 }
 551 #endif
 552
 553
 554 #if 0
 555 void MapgenV7::carveRivers() {
 556         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 557         MapNode n_stone(c_stone);
 558         u32 index = 0;
 559
 560         int river_depth = 4;
 561
 562         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 563         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 564                 float terrain_mod  = noise_terrain_mod->result[index];
 565                 NoiseParams *np = noise_terrain_river->np;
 566                 np.persist = noise_terrain_persist->result[index];
 567                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 568                 float height = terrain_river * (1 - abs(terrain_mod)) *
 569                                                 noise_terrain_river->np.scale;
 570                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 571
 572                 s16 y = heightmap[index];
 573                 if (height < 1.0 && y > river_depth &&
 574                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 575
 576                         for (s16 ry = y; ry != y - river_depth; ry--) {
 577                                 u32 vi = vm->m_area.index(x, ry, z);
 578                                 vm->m_data[vi] = n_air;
 579                         }
 580
 581                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 582                         vm->m_data[vi] = n_water_source;
 583                 }
 584         }
 585 }
 586 #endif
 587
 588
 589 #if 0
 590 void MapgenV7::addTopNodes()
 591 {
 592         v3s16 em = vm->m_area.getExtent();
 593         s16 ntopnodes;
 594         u32 index = 0;
 595
 596         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 597         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 598                 Biome *biome = bmgr->biomes[biomemap[index]];
 599
 600                 //////////////////// First, add top nodes below the ridge
 601                 s16 y = ridge_heightmap[index];
 602
 603                 // This cutoff is good enough, but not perfect.
 604                 // It will cut off potentially placed top nodes at chunk boundaries
 605                 if (y < node_min.Y)
 606                         continue;
 607                 if (y > node_max.Y) {
 608                         y = node_max.Y; // Let's see if we can still go downward anyway
 609                         u32 vi = vm->m_area.index(x, y, z);
 610                         content_t c = vm->m_data[vi].getContent();
 611                         if (ndef->get(c).walkable)
 612                                 continue;
 613                 }
 614
 615                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 616                 // might not be the actual height, just the lowest part in the chunk
 617                 // where a ridge had been carved
 618                 u32 i = vm->m_area.index(x, y, z);
 619                 for (; y >= node_min.Y; y--) {
 620                         content_t c = vm->m_data[i].getContent();
 621                         if (ndef->get(c).walkable)
 622                                 break;
 623                         vm->m_area.add_y(em, i, -1);
 624                 }
 625
 626                 if (y != node_min.Y - 1 && y >= water_level) {
 627                         ridge_heightmap[index] = y; //update ridgeheight
 628                         ntopnodes = biome->top_depth;
 629                         for (; y <= node_max.Y && ntopnodes; y++) {
 630                                 ntopnodes--;
 631                                 vm->m_data[i] = MapNode(biome->c_top);
 632                                 vm->m_area.add_y(em, i, 1);
 633                         }
 634                         // If dirt, grow grass on it.
 635                         if (y > water_level - 10 &&
 636                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 637                                 vm->m_area.add_y(em, i, -1);
 638                                 if (vm->m_data[i].getContent() == c_dirt)
 639                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 640                         }
 641                 }
 642
 643                 //////////////////// Now, add top nodes on top of the ridge
 644                 y = heightmap[index];
 645                 if (y > node_max.Y) {
 646                         y = node_max.Y; // Let's see if we can still go downward anyway
 647                         u32 vi = vm->m_area.index(x, y, z);
 648                         content_t c = vm->m_data[vi].getContent();
 649                         if (ndef->get(c).walkable)
 650                                 continue;
 651                 }
 652
 653                 i = vm->m_area.index(x, y, z);
 654                 for (; y >= node_min.Y; y--) {
 655                         content_t c = vm->m_data[i].getContent();
 656                         if (ndef->get(c).walkable)
 657                                 break;
 658                         vm->m_area.add_y(em, i, -1);
 659                 }
 660
 661                 if (y != node_min.Y - 1) {
 662                         ntopnodes = biome->top_depth;
 663                         // Let's see if we've already added it...
 664                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 665                                 continue;
 666
 667                         for (; y <= node_max.Y && ntopnodes; y++) {
 668                                 ntopnodes--;
 669                                 vm->m_data[i] = MapNode(biome->c_top);
 670                                 vm->m_area.add_y(em, i, 1);
 671                         }
 672                         // If dirt, grow grass on it.
 673                         if (y > water_level - 10 &&
 674                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 675                                 vm->m_area.add_y(em, i, -1);
 676                                 if (vm->m_data[i].getContent() == c_dirt)
 677                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 678                         }
 679                 }
 680         }
 681 }
 682 #endif