src/mapgen_v6.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "mapgen.h"
  21 #include "voxel.h"
  22 #include "noise.h"
  23 #include "mapblock.h"
  24 #include "mapnode.h"
  25 #include "map.h"
  26 //#include "serverobject.h"
  27 #include "content_sao.h"
  28 #include "nodedef.h"
  29 #include "content_mapnode.h" // For content_mapnode_get_new_name
  30 #include "voxelalgorithms.h"
  31 #include "profiler.h"
  32 #include "settings.h" // For g_settings
  33 #include "main.h" // For g_profiler
  34 #include "mapgen_v6.h"
  35
  36 /////////////////// Mapgen V6 perlin noise default values
  37 NoiseParams nparams_v6_def_terrain_base =
  38         {-AVERAGE_MUD_AMOUNT, 20.0, v3f(250.0, 250.0, 250.0), 82341, 5, 0.6};
  39 NoiseParams nparams_v6_def_terrain_higher =
  40         {20.0, 16.0, v3f(500.0, 500.0, 500.0), 85039, 5, 0.6};
  41 NoiseParams nparams_v6_def_steepness =
  42         {0.85, 0.5, v3f(125.0, 125.0, 125.0), -932, 5, 0.7};
  43 NoiseParams nparams_v6_def_height_select =
  44         {0.5, 1.0, v3f(250.0, 250.0, 250.0), 4213, 5, 0.69};
  45 NoiseParams nparams_v6_def_trees =
  46         {0.0, 1.0, v3f(125.0, 125.0, 125.0), 2, 4, 0.66};
  47 NoiseParams nparams_v6_def_mud =
  48         {AVERAGE_MUD_AMOUNT, 2.0, v3f(200.0, 200.0, 200.0), 91013, 3, 0.55};
  49 NoiseParams nparams_v6_def_beach =
  50         {0.0, 1.0, v3f(250.0, 250.0, 250.0), 59420, 3, 0.50};
  51 NoiseParams nparams_v6_def_biome =
  52         {0.0, 1.0, v3f(250.0, 250.0, 250.0), 9130, 3, 0.50};
  53 NoiseParams nparams_v6_def_cave =
  54         {6.0, 6.0, v3f(250.0, 250.0, 250.0), 34329, 3, 0.50};
  55
  56
  57 ///////////////////////////////////////////////////////////////////////////////
  58
  59
  60 MapgenV6::MapgenV6(int mapgenid, MapgenV6Params *params) {
  61         this->generating  = false;
  62         this->id       = mapgenid;
  63
  64         this->seed     = (int)params->seed;
  65         this->water_level = params->water_level;
  66         this->flags   = params->flags;
  67         this->csize   = v3s16(1, 1, 1) * params->chunksize * MAP_BLOCKSIZE;
  68
  69         this->freq_desert = params->freq_desert;
  70         this->freq_beach  = params->freq_beach;
  71
  72         this->ystride = csize.X; //////fix this
  73
  74         np_cave = params->np_cave;
  75
  76         noise_terrain_base   = new Noise(params->np_terrain_base,   seed, csize.X, csize.Y);
  77         noise_terrain_higher = new Noise(params->np_terrain_higher, seed, csize.X, csize.Y);
  78         noise_steepness      = new Noise(params->np_steepness,      seed, csize.X, csize.Y);
  79         noise_height_select  = new Noise(params->np_height_select,  seed, csize.X, csize.Y);
  80         noise_trees          = new Noise(params->np_trees,          seed, csize.X, csize.Y);
  81         noise_mud            = new Noise(params->np_mud,            seed, csize.X, csize.Y);
  82         noise_beach          = new Noise(params->np_beach,          seed, csize.X, csize.Y);
  83         noise_biome          = new Noise(params->np_biome,          seed, csize.X, csize.Y);
  84
  85         map_terrain_base   = noise_terrain_base->result;
  86         map_terrain_higher = noise_terrain_higher->result;
  87         map_steepness      = noise_steepness->result;
  88         map_height_select  = noise_height_select->result;
  89         map_trees          = noise_trees->result;
  90         map_mud            = noise_mud->result;
  91         map_beach          = noise_beach->result;
  92         map_biome          = noise_biome->result;
  93 }
  94
  95
  96 MapgenV6::~MapgenV6() {
  97         delete noise_terrain_base;
  98         delete noise_terrain_higher;
  99         delete noise_steepness;
 100         delete noise_height_select;
 101         delete noise_trees;
 102         delete noise_mud;
 103         delete noise_beach;
 104         delete noise_biome;
 105 }
 106
 107
 108 /*
 109         Some helper functions for the map generator
 110 */
 111
 112 #if 1
 113 // Returns Y one under area minimum if not found
 114 s16 MapgenV6::find_ground_level(VoxelManipulator &vmanip, v2s16 p2d,
 115                 INodeDefManager *ndef)
 116 {
 117         v3s16 em = vmanip.m_area.getExtent();
 118         s16 y_nodes_max = vmanip.m_area.MaxEdge.Y;
 119         s16 y_nodes_min = vmanip.m_area.MinEdge.Y;
 120         u32 i = vmanip.m_area.index(v3s16(p2d.X, y_nodes_max, p2d.Y));
 121         s16 y;
 122         for(y=y_nodes_max; y>=y_nodes_min; y--)
 123         {
 124                 MapNode &n = vmanip.m_data[i];
 125                 if(ndef->get(n).walkable)
 126                         break;
 127
 128                 vmanip.m_area.add_y(em, i, -1);
 129         }
 130         if(y >= y_nodes_min)
 131                 return y;
 132         else
 133                 return y_nodes_min - 1;
 134 }
 135
 136 // Returns Y one under area minimum if not found
 137 s16 MapgenV6::find_stone_level(VoxelManipulator &vmanip, v2s16 p2d,
 138                 INodeDefManager *ndef)
 139 {
 140         v3s16 em = vmanip.m_area.getExtent();
 141         s16 y_nodes_max = vmanip.m_area.MaxEdge.Y;
 142         s16 y_nodes_min = vmanip.m_area.MinEdge.Y;
 143         u32 i = vmanip.m_area.index(v3s16(p2d.X, y_nodes_max, p2d.Y));
 144         s16 y;
 145         content_t c_stone = ndef->getId("mapgen_stone");
 146         content_t c_desert_stone = ndef->getId("mapgen_desert_stone");
 147         for(y=y_nodes_max; y>=y_nodes_min; y--)
 148         {
 149                 MapNode &n = vmanip.m_data[i];
 150                 content_t c = n.getContent();
 151                 if(c != CONTENT_IGNORE && (
 152                                 c == c_stone || c == c_desert_stone))
 153                         break;
 154
 155                 vmanip.m_area.add_y(em, i, -1);
 156         }
 157         if(y >= y_nodes_min)
 158                 return y;
 159         else
 160                 return y_nodes_min - 1;
 161 }
 162 #endif
 163
 164 void MapgenV6::make_tree(ManualMapVoxelManipulator &vmanip, v3s16 p0,
 165                 bool is_apple_tree, INodeDefManager *ndef)
 166 {
 167         MapNode treenode(ndef->getId("mapgen_tree"));
 168         MapNode leavesnode(ndef->getId("mapgen_leaves"));
 169         MapNode applenode(ndef->getId("mapgen_apple"));
 170
 171         s16 trunk_h = myrand_range(4, 5);
 172         v3s16 p1 = p0;
 173         for(s16 ii=0; ii<trunk_h; ii++)
 174         {
 175                 if(vmanip.m_area.contains(p1))
 176                         vmanip.m_data[vmanip.m_area.index(p1)] = treenode;
 177                 p1.Y++;
 178         }
 179
 180         // p1 is now the last piece of the trunk
 181         p1.Y -= 1;
 182
 183         VoxelArea leaves_a(v3s16(-2,-1,-2), v3s16(2,2,2));
 184         //SharedPtr<u8> leaves_d(new u8[leaves_a.getVolume()]);
 185         Buffer<u8> leaves_d(leaves_a.getVolume());
 186         for(s32 i=0; i<leaves_a.getVolume(); i++)
 187                 leaves_d[i] = 0;
 188
 189         // Force leaves at near the end of the trunk
 190         {
 191                 s16 d = 1;
 192                 for(s16 z=-d; z<=d; z++)
 193                 for(s16 y=-d; y<=d; y++)
 194                 for(s16 x=-d; x<=d; x++)
 195                 {
 196                         leaves_d[leaves_a.index(v3s16(x,y,z))] = 1;
 197                 }
 198         }
 199
 200         // Add leaves randomly
 201         for(u32 iii=0; iii<7; iii++)
 202         {
 203                 s16 d = 1;
 204
 205                 v3s16 p(
 206                         myrand_range(leaves_a.MinEdge.X, leaves_a.MaxEdge.X-d),
 207                         myrand_range(leaves_a.MinEdge.Y, leaves_a.MaxEdge.Y-d),
 208                         myrand_range(leaves_a.MinEdge.Z, leaves_a.MaxEdge.Z-d)
 209                 );
 210
 211                 for(s16 z=0; z<=d; z++)
 212                 for(s16 y=0; y<=d; y++)
 213                 for(s16 x=0; x<=d; x++)
 214                 {
 215                         leaves_d[leaves_a.index(p+v3s16(x,y,z))] = 1;
 216                 }
 217         }
 218
 219         // Blit leaves to vmanip
 220         for(s16 z=leaves_a.MinEdge.Z; z<=leaves_a.MaxEdge.Z; z++)
 221         for(s16 y=leaves_a.MinEdge.Y; y<=leaves_a.MaxEdge.Y; y++)
 222         for(s16 x=leaves_a.MinEdge.X; x<=leaves_a.MaxEdge.X; x++)
 223         {
 224                 v3s16 p(x,y,z);
 225                 p += p1;
 226                 if(vmanip.m_area.contains(p) == false)
 227                         continue;
 228                 u32 vi = vmanip.m_area.index(p);
 229                 if(vmanip.m_data[vi].getContent() != CONTENT_AIR
 230                                 && vmanip.m_data[vi].getContent() != CONTENT_IGNORE)
 231                         continue;
 232                 u32 i = leaves_a.index(x,y,z);
 233                 if(leaves_d[i] == 1) {
 234                         bool is_apple = myrand_range(0,99) < 10;
 235                         if(is_apple_tree && is_apple) {
 236                                 vmanip.m_data[vi] = applenode;
 237                         } else {
 238                                 vmanip.m_data[vi] = leavesnode;
 239                         }
 240                 }
 241         }
 242 }
 243
 244
 245 /*
 246         Noise functions. Make sure seed is mangled differently in each one.
 247 */
 248
 249
 250 // Amount of trees per area in nodes
 251 double MapgenV6::tree_amount_2d(u64 seed, v2s16 p)
 252 {
 253         /*double noise = noise2d_perlin(
 254                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 255                         seed+2, 4, 0.66);*/
 256         double noise = map_trees[(p.Y - node_min.Z) * ystride + (p.X - node_min.X)];
 257         double zeroval = -0.39;
 258         if(noise < zeroval)
 259                 return 0;
 260         else
 261                 return 0.04 * (noise-zeroval) / (1.0-zeroval);
 262 }
 263
 264 // Required by mapgen.h
 265 bool MapgenV6::block_is_underground(u64 seed, v3s16 blockpos)
 266 {
 267         /*s16 minimum_groundlevel = (s16)get_sector_minimum_ground_level(
 268                         seed, v2s16(blockpos.X, blockpos.Z));*/
 269         // Nah, this is just a heuristic, just return something
 270         s16 minimum_groundlevel = water_level;
 271
 272         if(blockpos.Y*MAP_BLOCKSIZE + MAP_BLOCKSIZE <= minimum_groundlevel)
 273                 return true;
 274         else
 275                 return false;
 276 }
 277
 278
 279 double MapgenV6::base_rock_level_2d(u64 seed, v2s16 p)
 280 {
 281         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 282
 283         // The base ground level
 284         /*double base = (double)WATER_LEVEL - (double)AVERAGE_MUD_AMOUNT
 285                         + 20. * noise2d_perlin(
 286                         0.5+(float)p.X/250., 0.5+(float)p.Y/250.,
 287                         seed+82341, 5, 0.6);*/
 288         double base = water_level + map_terrain_base[index];
 289
 290         // Higher ground level
 291         /*double higher = (double)WATER_LEVEL + 20. + 16. * noise2d_perlin(
 292                         0.5+(float)p.X/500., 0.5+(float)p.Y/500.,
 293                         seed+85039, 5, 0.6);*/
 294         double higher = water_level + map_terrain_higher[index];
 295
 296         // Limit higher to at least base
 297         if(higher < base)
 298                 higher = base;
 299
 300         // Steepness factor of cliffs
 301         /*double b = 0.85 + 0.5 * noise2d_perlin(
 302                         0.5+(float)p.X/125., 0.5+(float)p.Y/125.,
 303                         seed-932, 5, 0.7);*/
 304         double b = map_steepness[index];
 305         b = rangelim(b, 0.0, 1000.0);
 306         b = pow(b, 7);
 307         b *= 5;
 308         b = rangelim(b, 0.5, 1000.0);
 309
 310         // Values 1.5...100 give quite horrible looking slopes
 311         if(b > 1.5 && b < 100.0){
 312                 if(b < 10.0)
 313                         b = 1.5;
 314                 else
 315                         b = 100.0;
 316         }
 317
 318         // Offset to more low
 319         double a_off = -0.20;
 320
 321         // High/low selector
 322         /*double a = (double)0.5 + b * (a_off + noise2d_perlin(
 323                         0.5+(float)p.X/250., 0.5+(float)p.Y/250.,
 324                         seed+4213, 5, 0.69));*/
 325         double a = 0.5 + b * (a_off + map_height_select[index]);
 326
 327         // Limit
 328         a = rangelim(a, 0.0, 1.0);
 329
 330         double h = base*(1.0-a) + higher*a;
 331
 332         return h;
 333 }
 334
 335 double MapgenV6::baseRockLevelFromNoise(v2s16 p) {
 336         double base = water_level +
 337                 NoisePerlin2DPosOffset(noise_terrain_base->np, p.X, 0.5, p.Y, 0.5, seed);
 338         double higher = water_level +
 339                 NoisePerlin2DPosOffset(noise_terrain_higher->np, p.X, 0.5, p.Y, 0.5, seed);
 340
 341         if (higher < base)
 342                 higher = base;
 343
 344         double b = NoisePerlin2DPosOffset(noise_steepness->np, p.X, 0.5, p.Y, 0.5, seed);
 345         b = rangelim(b, 0.0, 1000.0);
 346         b = b*b*b*b*b*b*b;
 347         b *= 5;
 348         b = rangelim(b, 0.5, 1000.0);
 349
 350         if(b > 1.5 && b < 100.0){
 351                 if(b < 10.0)
 352                         b = 1.5;
 353                 else
 354                         b = 100.0;
 355         }
 356
 357         double a_off = -0.20;
 358         double a = 0.5 + b * (a_off + NoisePerlin2DNoTxfmPosOffset(
 359                         noise_height_select->np, p.X, 0.5, p.Y, 0.5, seed));
 360         a = rangelim(a, 0.0, 1.0);
 361
 362         return base * (1.0 - a) + higher * a;
 363 }
 364
 365
 366 s16 MapgenV6::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision)
 367 {
 368         return baseRockLevelFromNoise(p2d) + AVERAGE_MUD_AMOUNT;
 369 }
 370
 371 double MapgenV6::get_mud_add_amount(u64 seed, v2s16 p)
 372 {
 373         /*return ((float)AVERAGE_MUD_AMOUNT + 2.0 * noise2d_perlin(
 374                         0.5+(float)p.X/200, 0.5+(float)p.Y/200,
 375                         seed+91013, 3, 0.55));*/
 376         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 377         return map_mud[index];
 378 }
 379
 380 bool MapgenV6::get_have_beach(u64 seed, v2s16 p2d)
 381 {
 382         // Determine whether to have sand here
 383         /*double sandnoise = noise2d_perlin(
 384                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 385                         seed+59420, 3, 0.50);*/
 386         int index = (p2d.Y - node_min.Z) * ystride + (p2d.X - node_min.X);
 387         double sandnoise = map_beach[index];
 388
 389         return (sandnoise > freq_beach);
 390 }
 391
 392 BiomeType MapgenV6::get_biome(u64 seed, v2s16 p2d)
 393 {
 394         // Just do something very simple as for now
 395         /*double d = noise2d_perlin(
 396                         0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
 397                         seed+9130, 3, 0.50);*/
 398         int index = (p2d.Y - node_min.Z) * ystride + (p2d.X - node_min.X);
 399         double d = map_biome[index];
 400         if(d > freq_desert)
 401                 return BT_DESERT;
 402         if (flags & MGV6_BIOME_BLEND) {
 403                 if(d > freq_desert - 0.10 &&
 404                          (noise2d(p2d.X, p2d.Y, seed) + 1.0) > (freq_desert - d) * 20.0)
 405                         return BT_DESERT;
 406         }
 407         return BT_NORMAL;
 408 };
 409
 410 u32 MapgenV6::get_blockseed(u64 seed, v3s16 p)
 411 {
 412         s32 x=p.X, y=p.Y, z=p.Z;
 413         return (u32)(seed%0x100000000ULL) + z*38134234 + y*42123 + x*23;
 414 }
 415
 416
 417 int MapgenV6::getGroundLevelAtPoint(v2s16 p) {
 418         return baseRockLevelFromNoise(p) + AVERAGE_MUD_AMOUNT;
 419 }
 420
 421 #define VMANIP_FLAG_CAVE VOXELFLAG_CHECKED1
 422
 423 void MapgenV6::makeChunk(BlockMakeData *data)
 424 {
 425         if(data->no_op)
 426         {
 427                 //dstream<<"makeBlock: no-op"<<std::endl;
 428                 return;
 429         }
 430
 431         this->generating = true;
 432
 433         assert(data->vmanip);
 434         assert(data->nodedef);
 435         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 436                         data->blockpos_requested.Y >= data->blockpos_min.Y &&
 437                         data->blockpos_requested.Z >= data->blockpos_min.Z);
 438         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 439                         data->blockpos_requested.Y <= data->blockpos_max.Y &&
 440                         data->blockpos_requested.Z <= data->blockpos_max.Z);
 441
 442         INodeDefManager *ndef = data->nodedef;
 443
 444         // Hack: use minimum block coordinates for old code that assumes
 445         // a single block
 446         v3s16 blockpos = data->blockpos_requested;
 447
 448         /*dstream<<"makeBlock(): ("<<blockpos.X<<","<<blockpos.Y<<","
 449                         <<blockpos.Z<<")"<<std::endl;*/
 450
 451         v3s16 blockpos_min = data->blockpos_min;
 452         v3s16 blockpos_max = data->blockpos_max;
 453         v3s16 blockpos_full_min = blockpos_min - v3s16(1,1,1);
 454         v3s16 blockpos_full_max = blockpos_max + v3s16(1,1,1);
 455
 456         ManualMapVoxelManipulator &vmanip = *(data->vmanip);
 457         // Area of central chunk
 458         node_min = blockpos_min*MAP_BLOCKSIZE;
 459         node_max = (blockpos_max+v3s16(1,1,1))*MAP_BLOCKSIZE-v3s16(1,1,1);
 460         // Full allocated area
 461         v3s16 full_node_min = (blockpos_min-1)*MAP_BLOCKSIZE;
 462         v3s16 full_node_max = (blockpos_max+2)*MAP_BLOCKSIZE-v3s16(1,1,1);
 463
 464         v3s16 central_area_size = node_max - node_min + v3s16(1,1,1);
 465
 466         const s16 max_spread_amount = MAP_BLOCKSIZE;
 467
 468         int volume_blocks = (blockpos_max.X - blockpos_min.X + 1)
 469                         * (blockpos_max.Y - blockpos_min.Y + 1)
 470                         * (blockpos_max.Z - blockpos_max.Z + 1);
 471
 472         int volume_nodes = volume_blocks *
 473                         MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
 474
 475         // Generated surface area
 476         //double gen_area_nodes = MAP_BLOCKSIZE*MAP_BLOCKSIZE * rel_volume;
 477
 478         // Horribly wrong heuristic, but better than nothing
 479         bool block_is_underground = (water_level > node_max.Y);
 480
 481         /*
 482                 Create a block-specific seed
 483         */
 484         u32 blockseed = get_blockseed(data->seed, full_node_min);
 485
 486         /*
 487                 Make some noise
 488         */
 489         {
 490                 int x = node_min.X;
 491                 int z = node_min.Z;
 492
 493                 // Need to adjust for the original implementation's +.5 offset...
 494                 noise_terrain_base->perlinMap2D(
 495                         x + 0.5 * noise_terrain_base->np->spread.X,
 496                         z + 0.5 * noise_terrain_base->np->spread.Z);
 497                 noise_terrain_base->transformNoiseMap();
 498
 499                 noise_terrain_higher->perlinMap2D(
 500                         x + 0.5 * noise_terrain_higher->np->spread.X,
 501                         z + 0.5 * noise_terrain_higher->np->spread.Z);
 502                 noise_terrain_higher->transformNoiseMap();
 503
 504                 noise_steepness->perlinMap2D(
 505                         x + 0.5 * noise_steepness->np->spread.X,
 506                         z + 0.5 * noise_steepness->np->spread.Z);
 507                 noise_steepness->transformNoiseMap();
 508
 509                 noise_height_select->perlinMap2D(
 510                         x + 0.5 * noise_height_select->np->spread.X,
 511                         z + 0.5 * noise_height_select->np->spread.Z);
 512
 513                 noise_trees->perlinMap2D(
 514                         x + 0.5 * noise_trees->np->spread.X,
 515                         z + 0.5 * noise_trees->np->spread.Z);
 516
 517                 noise_mud->perlinMap2D(
 518                         x + 0.5 * noise_mud->np->spread.X,
 519                         z + 0.5 * noise_mud->np->spread.Z);
 520                 noise_mud->transformNoiseMap();
 521
 522                 noise_beach->perlinMap2D(
 523                         x + 0.2 * noise_beach->np->spread.X,
 524                         z + 0.7 * noise_beach->np->spread.Z);
 525
 526                 noise_biome->perlinMap2D(
 527                         x + 0.6 * noise_biome->np->spread.X,
 528                         z + 0.2 * noise_biome->np->spread.Z);
 529         }
 530
 531
 532         /*
 533                 Cache some ground type values for speed
 534         */
 535
 536 // Creates variables c_name=id and n_name=node
 537 #define CONTENT_VARIABLE(ndef, name)\
 538         content_t c_##name = ndef->getId("mapgen_" #name);\
 539         MapNode n_##name(c_##name);
 540 // Default to something else if was CONTENT_IGNORE
 541 #define CONTENT_VARIABLE_FALLBACK(name, dname)\
 542         if(c_##name == CONTENT_IGNORE){\
 543                 c_##name = c_##dname;\
 544                 n_##name = n_##dname;\
 545         }
 546
 547         CONTENT_VARIABLE(ndef, stone);
 548         CONTENT_VARIABLE(ndef, air);
 549         CONTENT_VARIABLE(ndef, water_source);
 550         CONTENT_VARIABLE(ndef, dirt);
 551         CONTENT_VARIABLE(ndef, sand);
 552         CONTENT_VARIABLE(ndef, gravel);
 553         CONTENT_VARIABLE(ndef, clay);
 554         CONTENT_VARIABLE(ndef, lava_source);
 555         CONTENT_VARIABLE(ndef, cobble);
 556         CONTENT_VARIABLE(ndef, mossycobble);
 557         CONTENT_VARIABLE(ndef, dirt_with_grass);
 558         CONTENT_VARIABLE(ndef, junglegrass);
 559         CONTENT_VARIABLE(ndef, stone_with_coal);
 560         CONTENT_VARIABLE(ndef, stone_with_iron);
 561         CONTENT_VARIABLE(ndef, mese);
 562         CONTENT_VARIABLE(ndef, desert_sand);
 563         CONTENT_VARIABLE_FALLBACK(desert_sand, sand);
 564         CONTENT_VARIABLE(ndef, desert_stone);
 565         CONTENT_VARIABLE_FALLBACK(desert_stone, stone);
 566
 567         // Maximum height of the stone surface and obstacles.
 568         // This is used to guide the cave generation
 569         s16 stone_surface_max_y = 0;
 570
 571         /*
 572                 Generate general ground level to full area
 573         */
 574         {
 575 #if 1
 576         TimeTaker timer1("Generating ground level");
 577
 578         for(s16 x=node_min.X; x<=node_max.X; x++)
 579         for(s16 z=node_min.Z; z<=node_max.Z; z++)
 580         {
 581                 // Node position
 582                 v2s16 p2d = v2s16(x,z);
 583
 584                 /*
 585                         Skip of already generated
 586                 */
 587                 /*{
 588                         v3s16 p(p2d.X, node_min.Y, p2d.Y);
 589                         if(vmanip.m_data[vmanip.m_area.index(p)].d != CONTENT_AIR)
 590                                 continue;
 591                 }*/
 592
 593                 // Ground height at this point
 594                 float surface_y_f = 0.0;
 595
 596                 // Use perlin noise for ground height
 597                 surface_y_f = base_rock_level_2d(data->seed, p2d);
 598
 599                 /*// Experimental stuff
 600                 {
 601                         float a = highlands_level_2d(data->seed, p2d);
 602                         if(a > surface_y_f)
 603                                 surface_y_f = a;
 604                 }*/
 605
 606                 // Convert to integer
 607                 s16 surface_y = (s16)surface_y_f;
 608
 609                 // Log it
 610                 if(surface_y > stone_surface_max_y)
 611                         stone_surface_max_y = surface_y;
 612
 613                 BiomeType bt = get_biome(data->seed, p2d);
 614                 /*
 615                         Fill ground with stone
 616                 */
 617                 {
 618                         // Use fast index incrementing
 619                         v3s16 em = vmanip.m_area.getExtent();
 620                         u32 i = vmanip.m_area.index(v3s16(p2d.X, node_min.Y, p2d.Y));
 621                         for(s16 y=node_min.Y; y<=node_max.Y; y++)
 622                         {
 623                                 if(vmanip.m_data[i].getContent() == CONTENT_IGNORE){
 624                                         if(y <= surface_y){
 625                                                 if(y > water_level && bt == BT_DESERT)
 626                                                         vmanip.m_data[i] = n_desert_stone;
 627                                                 else
 628                                                         vmanip.m_data[i] = n_stone;
 629                                         } else if(y <= water_level){
 630                                                 vmanip.m_data[i] = MapNode(c_water_source);
 631                                         } else {
 632                                                 vmanip.m_data[i] = MapNode(c_air);
 633                                         }
 634                                 }
 635                                 vmanip.m_area.add_y(em, i, 1);
 636                         }
 637                 }
 638         }
 639 #endif
 640
 641         }//timer1
 642
 643         // Limit dirt flow area by 1 because mud is flown into neighbors.
 644         assert(central_area_size.X == central_area_size.Z);
 645         s16 mudflow_minpos = 0-max_spread_amount+1;
 646         s16 mudflow_maxpos = central_area_size.X+max_spread_amount-2;
 647
 648         /*
 649                 Loop this part, it will make stuff look older and newer nicely
 650         */
 651
 652         /*double cave_amount = 6.0 + 6.0 * noise2d_perlin(
 653                         0.5+(double)node_min.X/250, 0.5+(double)node_min.Y/250,
 654                         data->seed+34329, 3, 0.50);*/
 655
 656         double cave_amount = NoisePerlin2D(np_cave, node_min.X, node_min.Y, data->seed);
 657
 658         const u32 age_loops = 2;
 659         for(u32 i_age=0; i_age<age_loops; i_age++)
 660         { // Aging loop
 661         /******************************
 662                 BEGINNING OF AGING LOOP
 663         ******************************/
 664
 665 #if 1
 666         {
 667         // 24ms @cs=8
 668         //TimeTaker timer1("caves");
 669
 670         /*
 671                 Make caves (this code is relatively horrible)
 672         */
 673         cave_amount = MYMAX(0.0, cave_amount);
 674         u32 caves_count = cave_amount * volume_nodes / 50000;
 675         u32 bruises_count = 1;
 676         PseudoRandom ps(blockseed+21343);
 677         PseudoRandom ps2(blockseed+1032);
 678         if(ps.range(1, 6) == 1)
 679                 bruises_count = ps.range(0, ps.range(0, 2));
 680         if(get_biome(data->seed, v2s16(node_min.X, node_min.Z)) == BT_DESERT){
 681                 caves_count /= 3;
 682                 bruises_count /= 3;
 683         }
 684         for(u32 jj=0; jj<caves_count+bruises_count; jj++)
 685         {
 686                 if (!(flags & MG_CAVES))
 687                         continue;
 688
 689                 /*int avg_height = (int)
 690                           ((base_rock_level_2d(data->seed, v2s16(node_min.X, node_min.Z)) +
 691                                 base_rock_level_2d(data->seed, v2s16(node_max.X, node_max.Z))) / 2);
 692                 if ((node_max.Y + node_min.Y) / 2 > avg_height)
 693                         break;*/
 694
 695                 bool large_cave = (jj >= caves_count);
 696                 s16 min_tunnel_diameter = 2;
 697                 s16 max_tunnel_diameter = ps.range(2,6);
 698                 int dswitchint = ps.range(1,14);
 699                 u16 tunnel_routepoints = 0;
 700                 int part_max_length_rs = 0;
 701                 if(large_cave){
 702                         part_max_length_rs = ps.range(2,4);
 703                         tunnel_routepoints = ps.range(5, ps.range(15,30));
 704                         min_tunnel_diameter = 5;
 705                         max_tunnel_diameter = ps.range(7, ps.range(8,24));
 706                 } else {
 707                         part_max_length_rs = ps.range(2,9);
 708                         tunnel_routepoints = ps.range(10, ps.range(15,30));
 709                 }
 710                 bool large_cave_is_flat = (ps.range(0,1) == 0);
 711
 712                 v3f main_direction(0,0,0);
 713
 714                 // Allowed route area size in nodes
 715                 v3s16 ar = central_area_size;
 716
 717                 // Area starting point in nodes
 718                 v3s16 of = node_min;
 719
 720                 // Allow a bit more
 721                 //(this should be more than the maximum radius of the tunnel)
 722                 s16 insure = 10;
 723                 s16 more = max_spread_amount - max_tunnel_diameter/2 - insure;
 724                 ar += v3s16(1,0,1) * more * 2;
 725                 of -= v3s16(1,0,1) * more;
 726
 727                 s16 route_y_min = 0;
 728                 // Allow half a diameter + 7 over stone surface
 729                 s16 route_y_max = -of.Y + stone_surface_max_y + max_tunnel_diameter/2 + 7;
 730
 731                 // Limit maximum to area
 732                 route_y_max = rangelim(route_y_max, 0, ar.Y-1);
 733
 734                 if(large_cave)
 735                 {
 736                         s16 min = 0;
 737                         if(node_min.Y < water_level && node_max.Y > water_level)
 738                         {
 739                                 min = water_level - max_tunnel_diameter/3 - of.Y;
 740                                 route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
 741                         }
 742                         route_y_min = ps.range(min, min + max_tunnel_diameter);
 743                         route_y_min = rangelim(route_y_min, 0, route_y_max);
 744                 }
 745
 746                 s16 route_start_y_min = route_y_min;
 747                 s16 route_start_y_max = route_y_max;
 748
 749                 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y-1);
 750                 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y-1);
 751
 752                 // Randomize starting position
 753                 v3f orp(
 754                         (float)(ps.next()%ar.X)+0.5,
 755                         (float)(ps.range(route_start_y_min, route_start_y_max))+0.5,
 756                         (float)(ps.next()%ar.Z)+0.5
 757                 );
 758
 759                 v3s16 startp(orp.X, orp.Y, orp.Z);
 760                 startp += of;
 761
 762                 MapNode airnode(CONTENT_AIR);
 763                 MapNode waternode(c_water_source);
 764                 MapNode lavanode(c_lava_source);
 765
 766                 /*
 767                         Generate some tunnel starting from orp
 768                 */
 769
 770                 for(u16 j=0; j<tunnel_routepoints; j++)
 771                 {
 772                         if(j%dswitchint==0 && large_cave == false)
 773                         {
 774                                 main_direction = v3f(
 775                                         ((float)(ps.next()%20)-(float)10)/10,
 776                                         ((float)(ps.next()%20)-(float)10)/30,
 777                                         ((float)(ps.next()%20)-(float)10)/10
 778                                 );
 779                                 main_direction *= (float)ps.range(0, 10)/10;
 780                         }
 781
 782                         // Randomize size
 783                         s16 min_d = min_tunnel_diameter;
 784                         s16 max_d = max_tunnel_diameter;
 785                         s16 rs = ps.range(min_d, max_d);
 786
 787                         // Every second section is rough
 788                         bool randomize_xz = (ps2.range(1,2) == 1);
 789
 790                         v3s16 maxlen;
 791                         if(large_cave)
 792                         {
 793                                 maxlen = v3s16(
 794                                         rs*part_max_length_rs,
 795                                         rs*part_max_length_rs/2,
 796                                         rs*part_max_length_rs
 797                                 );
 798                         }
 799                         else
 800                         {
 801                                 maxlen = v3s16(
 802                                         rs*part_max_length_rs,
 803                                         ps.range(1, rs*part_max_length_rs),
 804                                         rs*part_max_length_rs
 805                                 );
 806                         }
 807
 808                         v3f vec;
 809
 810                         vec = v3f(
 811                                 (float)(ps.next()%(maxlen.X*1))-(float)maxlen.X/2,
 812                                 (float)(ps.next()%(maxlen.Y*1))-(float)maxlen.Y/2,
 813                                 (float)(ps.next()%(maxlen.Z*1))-(float)maxlen.Z/2
 814                         );
 815
 816                         // Jump downward sometimes
 817                         if(!large_cave && ps.range(0,12) == 0)
 818                         {
 819                                 vec = v3f(
 820                                         (float)(ps.next()%(maxlen.X*1))-(float)maxlen.X/2,
 821                                         (float)(ps.next()%(maxlen.Y*2))-(float)maxlen.Y*2/2,
 822                                         (float)(ps.next()%(maxlen.Z*1))-(float)maxlen.Z/2
 823                                 );
 824                         }
 825
 826                         /*if(large_cave){
 827                                 v3f p = orp + vec;
 828                                 s16 h = find_ground_level_clever(vmanip,
 829                                                 v2s16(p.X, p.Z), ndef);
 830                                 route_y_min = h - rs/3;
 831                                 route_y_max = h + rs;
 832                         }*/
 833
 834                         vec += main_direction;
 835
 836                         v3f rp = orp + vec;
 837                         if(rp.X < 0)
 838                                 rp.X = 0;
 839                         else if(rp.X >= ar.X)
 840                                 rp.X = ar.X-1;
 841                         if(rp.Y < route_y_min)
 842                                 rp.Y = route_y_min;
 843                         else if(rp.Y >= route_y_max)
 844                                 rp.Y = route_y_max-1;
 845                         if(rp.Z < 0)
 846                                 rp.Z = 0;
 847                         else if(rp.Z >= ar.Z)
 848                                 rp.Z = ar.Z-1;
 849                         vec = rp - orp;
 850
 851                         for(float f=0; f<1.0; f+=1.0/vec.getLength())
 852                         {
 853                                 v3f fp = orp + vec * f;
 854                                 fp.X += 0.1*ps.range(-10,10);
 855                                 fp.Z += 0.1*ps.range(-10,10);
 856                                 v3s16 cp(fp.X, fp.Y, fp.Z);
 857
 858                                 s16 d0 = -rs/2;
 859                                 s16 d1 = d0 + rs;
 860                                 if(randomize_xz){
 861                                         d0 += ps.range(-1,1);
 862                                         d1 += ps.range(-1,1);
 863                                 }
 864                                 for(s16 z0=d0; z0<=d1; z0++)
 865                                 {
 866                                         s16 si = rs/2 - MYMAX(0, abs(z0)-rs/7-1);
 867                                         for(s16 x0=-si-ps.range(0,1); x0<=si-1+ps.range(0,1); x0++)
 868                                         {
 869                                                 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
 870                                                 s16 si2 = rs/2 - MYMAX(0, maxabsxz-rs/7-1);
 871                                                 for(s16 y0=-si2; y0<=si2; y0++)
 872                                                 {
 873                                                         /*// Make better floors in small caves
 874                                                         if(y0 <= -rs/2 && rs<=7)
 875                                                                 continue;*/
 876                                                         if(large_cave_is_flat){
 877                                                                 // Make large caves not so tall
 878                                                                 if(rs > 7 && abs(y0) >= rs/3)
 879                                                                         continue;
 880                                                         }
 881
 882                                                         s16 z = cp.Z + z0;
 883                                                         s16 y = cp.Y + y0;
 884                                                         s16 x = cp.X + x0;
 885                                                         v3s16 p(x,y,z);
 886                                                         p += of;
 887
 888                                                         if(vmanip.m_area.contains(p) == false)
 889                                                                 continue;
 890
 891                                                         u32 i = vmanip.m_area.index(p);
 892
 893                                                         if(large_cave)
 894                                                         {
 895                                                                 if(full_node_min.Y < water_level &&
 896                                                                         full_node_max.Y > water_level){
 897                                                                         if(p.Y <= water_level)
 898                                                                                 vmanip.m_data[i] = waternode;
 899                                                                         else
 900                                                                                 vmanip.m_data[i] = airnode;
 901                                                                 } else if(full_node_max.Y < water_level){
 902                                                                         if(p.Y < startp.Y - 2)
 903                                                                                 vmanip.m_data[i] = lavanode;
 904                                                                         else
 905                                                                                 vmanip.m_data[i] = airnode;
 906                                                                 } else {
 907                                                                         vmanip.m_data[i] = airnode;
 908                                                                 }
 909                                                         } else {
 910                                                                 // Don't replace air or water or lava or ignore
 911                                                                 if(vmanip.m_data[i].getContent() == CONTENT_IGNORE ||
 912                                                                 vmanip.m_data[i].getContent() == CONTENT_AIR ||
 913                                                                 vmanip.m_data[i].getContent() == c_water_source ||
 914                                                                 vmanip.m_data[i].getContent() == c_lava_source)
 915                                                                         continue;
 916
 917                                                                 vmanip.m_data[i] = airnode;
 918
 919                                                                 // Set tunnel flag
 920                                                                 vmanip.m_flags[i] |= VMANIP_FLAG_CAVE;
 921                                                         }
 922                                                 }
 923                                         }
 924                                 }
 925                         }
 926
 927                         orp = rp;
 928                 }
 929
 930         }
 931
 932         }//timer1
 933 #endif
 934
 935 #if 1
 936         {
 937         // 15ms @cs=8
 938         TimeTaker timer1("add mud");
 939
 940         /*
 941                 Add mud to the central chunk
 942         */
 943
 944         for(s16 x=node_min.X; x<=node_max.X; x++)
 945         for(s16 z=node_min.Z; z<=node_max.Z; z++)
 946         {
 947                 // Node position in 2d
 948                 v2s16 p2d = v2s16(x,z);
 949
 950                 // Randomize mud amount
 951                 s16 mud_add_amount = get_mud_add_amount(data->seed, p2d) / 2.0 + 0.5;
 952
 953                 // Find ground level
 954                 s16 surface_y = find_stone_level(vmanip, p2d, ndef);
 955                 // Handle area not found
 956                 if(surface_y == vmanip.m_area.MinEdge.Y - 1)
 957                         continue;
 958
 959                 MapNode addnode(c_dirt);
 960                 BiomeType bt = get_biome(data->seed, p2d);
 961
 962                 if(bt == BT_DESERT)
 963                         addnode = MapNode(c_desert_sand);
 964
 965                 if(bt == BT_DESERT && surface_y + mud_add_amount <= water_level+1){
 966                         addnode = MapNode(c_sand);
 967                 } else if(mud_add_amount <= 0){
 968                         mud_add_amount = 1 - mud_add_amount;
 969                         addnode = MapNode(c_gravel);
 970                 } else if(bt == BT_NORMAL && get_have_beach(data->seed, p2d) &&
 971                                 surface_y + mud_add_amount <= water_level+2){
 972                         addnode = MapNode(c_sand);
 973                 }
 974
 975                 if(bt == BT_DESERT){
 976                         if(surface_y > 20){
 977                                 mud_add_amount = MYMAX(0, mud_add_amount - (surface_y - 20)/5);
 978                         }
 979                 }
 980
 981                 /*
 982                         If topmost node is grass, change it to mud.
 983                         It might be if it was flown to there from a neighboring
 984                         chunk and then converted.
 985                 */
 986                 {
 987                         u32 i = vmanip.m_area.index(v3s16(p2d.X, surface_y, p2d.Y));
 988                         MapNode *n = &vmanip.m_data[i];
 989                         if(n->getContent() == c_dirt_with_grass)
 990                                 *n = MapNode(c_dirt);
 991                 }
 992
 993                 /*
 994                         Add mud on ground
 995                 */
 996                 {
 997                         s16 mudcount = 0;
 998                         v3s16 em = vmanip.m_area.getExtent();
 999                         s16 y_start = surface_y+1;
1000                         u32 i = vmanip.m_area.index(v3s16(p2d.X, y_start, p2d.Y));
1001                         for(s16 y=y_start; y<=node_max.Y; y++)
1002                         {
1003                                 if(mudcount >= mud_add_amount)
1004                                         break;
1005
1006                                 MapNode &n = vmanip.m_data[i];
1007                                 n = addnode;
1008                                 mudcount++;
1009
1010                                 vmanip.m_area.add_y(em, i, 1);
1011                         }
1012                 }
1013
1014         }
1015
1016         }//timer1
1017 #endif
1018
1019         /*
1020                 Add blobs of dirt and gravel underground
1021         */
1022         if(get_biome(data->seed, v2s16(node_min.X, node_min.Z)) == BT_NORMAL)
1023         {
1024         PseudoRandom pr(blockseed+983);
1025         for(int i=0; i<volume_nodes/10/10/10; i++)
1026         {
1027                 bool only_fill_cave = (myrand_range(0,1) != 0);
1028                 v3s16 size(
1029                         pr.range(1, 8),
1030                         pr.range(1, 8),
1031                         pr.range(1, 8)
1032                 );
1033                 v3s16 p0(
1034                         pr.range(node_min.X, node_max.X)-size.X/2,
1035                         pr.range(node_min.Y, node_max.Y)-size.Y/2,
1036                         pr.range(node_min.Z, node_max.Z)-size.Z/2
1037                 );
1038                 MapNode n1;
1039                 if(p0.Y > -32 && pr.range(0,1) == 0)
1040                         n1 = MapNode(c_dirt);
1041                 else
1042                         n1 = MapNode(c_gravel);
1043                 for(int x1=0; x1<size.X; x1++)
1044                 for(int y1=0; y1<size.Y; y1++)
1045                 for(int z1=0; z1<size.Z; z1++)
1046                 {
1047                         v3s16 p = p0 + v3s16(x1,y1,z1);
1048                         u32 i = vmanip.m_area.index(p);
1049                         if(!vmanip.m_area.contains(i))
1050                                 continue;
1051                         // Cancel if not stone and not cave air
1052                         if(vmanip.m_data[i].getContent() != c_stone &&
1053                                         !(vmanip.m_flags[i] & VMANIP_FLAG_CAVE))
1054                                 continue;
1055                         if(only_fill_cave && !(vmanip.m_flags[i] & VMANIP_FLAG_CAVE))
1056                                 continue;
1057                         vmanip.m_data[i] = n1;
1058                 }
1059         }
1060         }
1061
1062 #if 1
1063         {
1064         // 340ms @cs=8
1065         TimeTaker timer1("flow mud");
1066
1067         /*
1068                 Flow mud away from steep edges
1069         */
1070
1071         // Iterate a few times
1072         for(s16 k=0; k<3; k++)
1073         {
1074
1075         for(s16 x=mudflow_minpos; x<=mudflow_maxpos; x++)
1076         for(s16 z=mudflow_minpos; z<=mudflow_maxpos; z++)
1077         {
1078                 // Invert coordinates every 2nd iteration
1079                 if(k%2 == 0)
1080                 {
1081                         x = mudflow_maxpos - (x-mudflow_minpos);
1082                         z = mudflow_maxpos - (z-mudflow_minpos);
1083                 }
1084
1085                 // Node position in 2d
1086                 v2s16 p2d = v2s16(node_min.X, node_min.Z) + v2s16(x,z);
1087
1088                 v3s16 em = vmanip.m_area.getExtent();
1089                 u32 i = vmanip.m_area.index(v3s16(p2d.X, node_max.Y, p2d.Y));
1090                 s16 y=node_max.Y;
1091
1092                 while(y >= node_min.Y)
1093                 {
1094
1095                 for(;; y--)
1096                 {
1097                         MapNode *n = NULL;
1098                         // Find mud
1099                         for(; y>=node_min.Y; y--)
1100                         {
1101                                 n = &vmanip.m_data[i];
1102                                 //if(content_walkable(n->d))
1103                                 //      break;
1104                                 if(n->getContent() == c_dirt ||
1105                                                 n->getContent() == c_dirt_with_grass ||
1106                                                 n->getContent() == c_gravel)
1107                                         break;
1108
1109                                 vmanip.m_area.add_y(em, i, -1);
1110                         }
1111
1112                         // Stop if out of area
1113                         //if(vmanip.m_area.contains(i) == false)
1114                         if(y < node_min.Y)
1115                                 break;
1116
1117                         /*// If not mud, do nothing to it
1118                         MapNode *n = &vmanip.m_data[i];
1119                         if(n->d != CONTENT_MUD && n->d != CONTENT_GRASS)
1120                                 continue;*/
1121
1122                         if(n->getContent() == c_dirt ||
1123                                         n->getContent() == c_dirt_with_grass)
1124                         {
1125                                 // Make it exactly mud
1126                                 n->setContent(c_dirt);
1127
1128                                 /*
1129                                         Don't flow it if the stuff under it is not mud
1130                                 */
1131                                 {
1132                                         u32 i2 = i;
1133                                         vmanip.m_area.add_y(em, i2, -1);
1134                                         // Cancel if out of area
1135                                         if(vmanip.m_area.contains(i2) == false)
1136                                                 continue;
1137                                         MapNode *n2 = &vmanip.m_data[i2];
1138                                         if(n2->getContent() != c_dirt &&
1139                                                         n2->getContent() != c_dirt_with_grass)
1140                                                 continue;
1141                                 }
1142                         }
1143
1144                         /*s16 recurse_count = 0;
1145         mudflow_recurse:*/
1146
1147                         v3s16 dirs4[4] = {
1148                                 v3s16(0,0,1), // back
1149                                 v3s16(1,0,0), // right
1150                                 v3s16(0,0,-1), // front
1151                                 v3s16(-1,0,0), // left
1152                         };
1153
1154                         // Theck that upper is air or doesn't exist.
1155                         // Cancel dropping if upper keeps it in place
1156                         u32 i3 = i;
1157                         vmanip.m_area.add_y(em, i3, 1);
1158                         if(vmanip.m_area.contains(i3) == true
1159                                         && ndef->get(vmanip.m_data[i3]).walkable)
1160                         {
1161                                 continue;
1162                         }
1163
1164                         // Drop mud on side
1165
1166                         for(u32 di=0; di<4; di++)
1167                         {
1168                                 v3s16 dirp = dirs4[di];
1169                                 u32 i2 = i;
1170                                 // Move to side
1171                                 vmanip.m_area.add_p(em, i2, dirp);
1172                                 // Fail if out of area
1173                                 if(vmanip.m_area.contains(i2) == false)
1174                                         continue;
1175                                 // Check that side is air
1176                                 MapNode *n2 = &vmanip.m_data[i2];
1177                                 if(ndef->get(*n2).walkable)
1178                                         continue;
1179                                 // Check that under side is air
1180                                 vmanip.m_area.add_y(em, i2, -1);
1181                                 if(vmanip.m_area.contains(i2) == false)
1182                                         continue;
1183                                 n2 = &vmanip.m_data[i2];
1184                                 if(ndef->get(*n2).walkable)
1185                                         continue;
1186                                 /*// Check that under that is air (need a drop of 2)
1187                                 vmanip.m_area.add_y(em, i2, -1);
1188                                 if(vmanip.m_area.contains(i2) == false)
1189                                         continue;
1190                                 n2 = &vmanip.m_data[i2];
1191                                 if(content_walkable(n2->d))
1192                                         continue;*/
1193                                 // Loop further down until not air
1194                                 bool dropped_to_unknown = false;
1195                                 do{
1196                                         vmanip.m_area.add_y(em, i2, -1);
1197                                         n2 = &vmanip.m_data[i2];
1198                                         // if out of known area
1199                                         if(vmanip.m_area.contains(i2) == false
1200                                                         || n2->getContent() == CONTENT_IGNORE){
1201                                                 dropped_to_unknown = true;
1202                                                 break;
1203                                         }
1204                                 }while(ndef->get(*n2).walkable == false);
1205                                 // Loop one up so that we're in air
1206                                 vmanip.m_area.add_y(em, i2, 1);
1207                                 n2 = &vmanip.m_data[i2];
1208
1209                                 bool old_is_water = (n->getContent() == c_water_source);
1210                                 // Move mud to new place
1211                                 if(!dropped_to_unknown) {
1212                                         *n2 = *n;
1213                                         // Set old place to be air (or water)
1214                                         if(old_is_water)
1215                                                 *n = MapNode(c_water_source);
1216                                         else
1217                                                 *n = MapNode(CONTENT_AIR);
1218                                 }
1219
1220                                 // Done
1221                                 break;
1222                         }
1223                 }
1224                 }
1225         }
1226
1227         }
1228
1229         }//timer1
1230 #endif
1231
1232         } // Aging loop
1233         /***********************
1234                 END OF AGING LOOP
1235         ************************/
1236
1237         /*
1238                 Add top and bottom side of water to transforming_liquid queue
1239         */
1240
1241         for(s16 x=full_node_min.X; x<=full_node_max.X; x++)
1242         for(s16 z=full_node_min.Z; z<=full_node_max.Z; z++)
1243         {
1244                 // Node position
1245                 v2s16 p2d(x,z);
1246                 {
1247                         bool water_found = false;
1248                         // Use fast index incrementing
1249                         v3s16 em = vmanip.m_area.getExtent();
1250                         u32 i = vmanip.m_area.index(v3s16(p2d.X, full_node_max.Y, p2d.Y));
1251                         for(s16 y=full_node_max.Y; y>=full_node_min.Y; y--)
1252                         {
1253                                 if(y == full_node_max.Y){
1254                                         water_found =
1255                                                 (vmanip.m_data[i].getContent() == c_water_source ||
1256                                                 vmanip.m_data[i].getContent() == c_lava_source);
1257                                 }
1258                                 else if(water_found == false)
1259                                 {
1260                                         if(vmanip.m_data[i].getContent() == c_water_source ||
1261                                                         vmanip.m_data[i].getContent() == c_lava_source)
1262                                         {
1263                                                 v3s16 p = v3s16(p2d.X, y, p2d.Y);
1264                                                 data->transforming_liquid.push_back(p);
1265                                                 water_found = true;
1266                                         }
1267                                 }
1268                                 else
1269                                 {
1270                                         // This can be done because water_found can only
1271                                         // turn to true and end up here after going through
1272                                         // a single block.
1273                                         if(vmanip.m_data[i+1].getContent() != c_water_source ||
1274                                                         vmanip.m_data[i+1].getContent() != c_lava_source)
1275                                         {
1276                                                 v3s16 p = v3s16(p2d.X, y+1, p2d.Y);
1277                                                 data->transforming_liquid.push_back(p);
1278                                                 water_found = false;
1279                                         }
1280                                 }
1281
1282                                 vmanip.m_area.add_y(em, i, -1);
1283                         }
1284                 }
1285         }
1286
1287         /*
1288                 Grow grass
1289         */
1290
1291         for(s16 x=full_node_min.X; x<=full_node_max.X; x++)
1292         for(s16 z=full_node_min.Z; z<=full_node_max.Z; z++)
1293         {
1294                 // Node position in 2d
1295                 v2s16 p2d = v2s16(x,z);
1296
1297                 /*
1298                         Find the lowest surface to which enough light ends up
1299                         to make grass grow.
1300
1301                         Basically just wait until not air and not leaves.
1302                 */
1303                 s16 surface_y = 0;
1304                 {
1305                         v3s16 em = vmanip.m_area.getExtent();
1306                         u32 i = vmanip.m_area.index(v3s16(p2d.X, node_max.Y, p2d.Y));
1307                         s16 y;
1308                         // Go to ground level
1309                         for(y=node_max.Y; y>=full_node_min.Y; y--)
1310                         {
1311                                 MapNode &n = vmanip.m_data[i];
1312                                 if(ndef->get(n).param_type != CPT_LIGHT
1313                                                 || ndef->get(n).liquid_type != LIQUID_NONE)
1314                                         break;
1315                                 vmanip.m_area.add_y(em, i, -1);
1316                         }
1317                         if(y >= full_node_min.Y)
1318                                 surface_y = y;
1319                         else
1320                                 surface_y = full_node_min.Y;
1321                 }
1322
1323                 u32 i = vmanip.m_area.index(p2d.X, surface_y, p2d.Y);
1324                 MapNode *n = &vmanip.m_data[i];
1325                 if(n->getContent() == c_dirt){
1326                         // Well yeah, this can't be overground...
1327                         if(surface_y < water_level - 20)
1328                                 continue;
1329                         n->setContent(c_dirt_with_grass);
1330                 }
1331         }
1332
1333         /*
1334                 Generate some trees
1335         */
1336         assert(central_area_size.X == central_area_size.Z);
1337         if (flags & MG_TREES) {
1338                 // Divide area into parts
1339                 s16 div = 8;
1340                 s16 sidelen = central_area_size.X / div;
1341                 double area = sidelen * sidelen;
1342                 for(s16 x0=0; x0<div; x0++)
1343                 for(s16 z0=0; z0<div; z0++)
1344                 {
1345                         // Center position of part of division
1346                         v2s16 p2d_center(
1347                                 node_min.X + sidelen/2 + sidelen*x0,
1348                                 node_min.Z + sidelen/2 + sidelen*z0
1349                         );
1350                         // Minimum edge of part of division
1351                         v2s16 p2d_min(
1352                                 node_min.X + sidelen*x0,
1353                                 node_min.Z + sidelen*z0
1354                         );
1355                         // Maximum edge of part of division
1356                         v2s16 p2d_max(
1357                                 node_min.X + sidelen + sidelen*x0 - 1,
1358                                 node_min.Z + sidelen + sidelen*z0 - 1
1359                         );
1360                         // Amount of trees
1361                         u32 tree_count = area * tree_amount_2d(data->seed, p2d_center);
1362                         // Put trees in random places on part of division
1363                         for(u32 i=0; i<tree_count; i++)
1364                         {
1365                                 s16 x = myrand_range(p2d_min.X, p2d_max.X);
1366                                 s16 z = myrand_range(p2d_min.Y, p2d_max.Y);
1367                                 s16 y = find_ground_level(vmanip, v2s16(x,z), ndef);
1368                                 // Don't make a tree under water level
1369                                 if(y < water_level)
1370                                         continue;
1371                                 // Don't make a tree so high that it doesn't fit
1372                                 if(y > node_max.Y - 6)
1373                                         continue;
1374                                 v3s16 p(x,y,z);
1375                                 /*
1376                                         Trees grow only on mud and grass
1377                                 */
1378                                 {
1379                                         u32 i = vmanip.m_area.index(v3s16(p));
1380                                         MapNode *n = &vmanip.m_data[i];
1381                                         if(n->getContent() != c_dirt
1382                                                         && n->getContent() != c_dirt_with_grass)
1383                                                 continue;
1384                                 }
1385                                 p.Y++;
1386                                 // Make a tree
1387                                 make_tree(vmanip, p, false, ndef);
1388                         }
1389                 }
1390         }
1391
1392
1393         /*
1394                 Calculate lighting
1395         */
1396         {
1397         ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update",
1398                         SPT_AVG);
1399         //VoxelArea a(node_min, node_max);
1400         VoxelArea a(node_min-v3s16(1,0,1)*MAP_BLOCKSIZE,
1401                         node_max+v3s16(1,0,1)*MAP_BLOCKSIZE);
1402         /*VoxelArea a(node_min-v3s16(1,0,1)*MAP_BLOCKSIZE/2,
1403                         node_max+v3s16(1,0,1)*MAP_BLOCKSIZE/2);*/
1404         enum LightBank banks[2] = {LIGHTBANK_DAY, LIGHTBANK_NIGHT};
1405         for(int i=0; i<2; i++)
1406         {
1407                 enum LightBank bank = banks[i];
1408
1409                 core::map<v3s16, bool> light_sources;
1410                 core::map<v3s16, u8> unlight_from;
1411
1412                 voxalgo::clearLightAndCollectSources(vmanip, a, bank, ndef,
1413                                 light_sources, unlight_from);
1414
1415                 bool inexistent_top_provides_sunlight = !block_is_underground;
1416                 voxalgo::SunlightPropagateResult res = voxalgo::propagateSunlight(
1417                                 vmanip, a, inexistent_top_provides_sunlight,
1418                                 light_sources, ndef);
1419                 // TODO: Do stuff according to bottom_sunlight_valid
1420
1421                 vmanip.unspreadLight(bank, unlight_from, light_sources, ndef);
1422
1423                 vmanip.spreadLight(bank, light_sources, ndef);
1424         }
1425         }
1426 }