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         if (flags & MG_FLAT)
 282                 return water_level;
 283
 284         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 285
 286         // The base ground level
 287         /*double base = (double)WATER_LEVEL - (double)AVERAGE_MUD_AMOUNT
 288                         + 20. * noise2d_perlin(
 289                         0.5+(float)p.X/250., 0.5+(float)p.Y/250.,
 290                         seed+82341, 5, 0.6);*/
 291         double base = water_level + map_terrain_base[index];
 292
 293         // Higher ground level
 294         /*double higher = (double)WATER_LEVEL + 20. + 16. * noise2d_perlin(
 295                         0.5+(float)p.X/500., 0.5+(float)p.Y/500.,
 296                         seed+85039, 5, 0.6);*/
 297         double higher = water_level + map_terrain_higher[index];
 298
 299         // Limit higher to at least base
 300         if(higher < base)
 301                 higher = base;
 302
 303         // Steepness factor of cliffs
 304         /*double b = 0.85 + 0.5 * noise2d_perlin(
 305                         0.5+(float)p.X/125., 0.5+(float)p.Y/125.,
 306                         seed-932, 5, 0.7);*/
 307         double b = map_steepness[index];
 308         b = rangelim(b, 0.0, 1000.0);
 309         b = pow(b, 7);
 310         b *= 5;
 311         b = rangelim(b, 0.5, 1000.0);
 312
 313         // Values 1.5...100 give quite horrible looking slopes
 314         if(b > 1.5 && b < 100.0){
 315                 if(b < 10.0)
 316                         b = 1.5;
 317                 else
 318                         b = 100.0;
 319         }
 320
 321         // Offset to more low
 322         double a_off = -0.20;
 323
 324         // High/low selector
 325         /*double a = (double)0.5 + b * (a_off + noise2d_perlin(
 326                         0.5+(float)p.X/250., 0.5+(float)p.Y/250.,
 327                         seed+4213, 5, 0.69));*/
 328         double a = 0.5 + b * (a_off + map_height_select[index]);
 329
 330         // Limit
 331         a = rangelim(a, 0.0, 1.0);
 332
 333         double h = base*(1.0-a) + higher*a;
 334
 335         return h;
 336 }
 337
 338 double MapgenV6::baseRockLevelFromNoise(v2s16 p) {
 339         if (flags & MG_FLAT)
 340                 return water_level;
 341
 342         double base = water_level +
 343                 NoisePerlin2DPosOffset(noise_terrain_base->np, p.X, 0.5, p.Y, 0.5, seed);
 344         double higher = water_level +
 345                 NoisePerlin2DPosOffset(noise_terrain_higher->np, p.X, 0.5, p.Y, 0.5, seed);
 346
 347         if (higher < base)
 348                 higher = base;
 349
 350         double b = NoisePerlin2DPosOffset(noise_steepness->np, p.X, 0.5, p.Y, 0.5, seed);
 351         b = rangelim(b, 0.0, 1000.0);
 352         b = b*b*b*b*b*b*b;
 353         b *= 5;
 354         b = rangelim(b, 0.5, 1000.0);
 355
 356         if(b > 1.5 && b < 100.0){
 357                 if(b < 10.0)
 358                         b = 1.5;
 359                 else
 360                         b = 100.0;
 361         }
 362
 363         double a_off = -0.20;
 364         double a = 0.5 + b * (a_off + NoisePerlin2DNoTxfmPosOffset(
 365                         noise_height_select->np, p.X, 0.5, p.Y, 0.5, seed));
 366         a = rangelim(a, 0.0, 1.0);
 367
 368         return base * (1.0 - a) + higher * a;
 369 }
 370
 371
 372 s16 MapgenV6::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision)
 373 {
 374         return baseRockLevelFromNoise(p2d) + AVERAGE_MUD_AMOUNT;
 375 }
 376
 377 double MapgenV6::get_mud_add_amount(u64 seed, v2s16 p)
 378 {
 379         if (flags & MG_FLAT)
 380                 return AVERAGE_MUD_AMOUNT;
 381
 382         /*return ((float)AVERAGE_MUD_AMOUNT + 2.0 * noise2d_perlin(
 383                         0.5+(float)p.X/200, 0.5+(float)p.Y/200,
 384                         seed+91013, 3, 0.55));*/
 385         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 386         return map_mud[index];
 387 }
 388
 389 bool MapgenV6::get_have_beach(u64 seed, v2s16 p2d)
 390 {
 391         // Determine whether to have sand here
 392         /*double sandnoise = noise2d_perlin(
 393                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 394                         seed+59420, 3, 0.50);*/
 395         int index = (p2d.Y - node_min.Z) * ystride + (p2d.X - node_min.X);
 396         double sandnoise = map_beach[index];
 397
 398         return (sandnoise > freq_beach);
 399 }
 400
 401 BiomeType MapgenV6::get_biome(u64 seed, v2s16 p2d)
 402 {
 403         // Just do something very simple as for now
 404         /*double d = noise2d_perlin(
 405                         0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
 406                         seed+9130, 3, 0.50);*/
 407         int index = (p2d.Y - node_min.Z) * ystride + (p2d.X - node_min.X);
 408         double d = map_biome[index];
 409         if(d > freq_desert)
 410                 return BT_DESERT;
 411         if (flags & MGV6_BIOME_BLEND) {
 412                 if(d > freq_desert - 0.10 &&
 413                          (noise2d(p2d.X, p2d.Y, seed) + 1.0) > (freq_desert - d) * 20.0)
 414                         return BT_DESERT;
 415         }
 416         return BT_NORMAL;
 417 };
 418
 419 u32 MapgenV6::get_blockseed(u64 seed, v3s16 p)
 420 {
 421         s32 x=p.X, y=p.Y, z=p.Z;
 422         return (u32)(seed%0x100000000ULL) + z*38134234 + y*42123 + x*23;
 423 }
 424
 425
 426 int MapgenV6::getGroundLevelAtPoint(v2s16 p) {
 427         return baseRockLevelFromNoise(p) + AVERAGE_MUD_AMOUNT;
 428 }
 429
 430 #define VMANIP_FLAG_CAVE VOXELFLAG_CHECKED1
 431
 432 void MapgenV6::makeChunk(BlockMakeData *data)
 433 {
 434         if(data->no_op)
 435         {
 436                 //dstream<<"makeBlock: no-op"<<std::endl;
 437                 return;
 438         }
 439
 440         this->generating = true;
 441
 442         assert(data->vmanip);
 443         assert(data->nodedef);
 444         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 445                         data->blockpos_requested.Y >= data->blockpos_min.Y &&
 446                         data->blockpos_requested.Z >= data->blockpos_min.Z);
 447         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 448                         data->blockpos_requested.Y <= data->blockpos_max.Y &&
 449                         data->blockpos_requested.Z <= data->blockpos_max.Z);
 450
 451         INodeDefManager *ndef = data->nodedef;
 452
 453         // Hack: use minimum block coordinates for old code that assumes
 454         // a single block
 455         v3s16 blockpos = data->blockpos_requested;
 456
 457         /*dstream<<"makeBlock(): ("<<blockpos.X<<","<<blockpos.Y<<","
 458                         <<blockpos.Z<<")"<<std::endl;*/
 459
 460         v3s16 blockpos_min = data->blockpos_min;
 461         v3s16 blockpos_max = data->blockpos_max;
 462         v3s16 blockpos_full_min = blockpos_min - v3s16(1,1,1);
 463         v3s16 blockpos_full_max = blockpos_max + v3s16(1,1,1);
 464
 465         ManualMapVoxelManipulator &vmanip = *(data->vmanip);
 466         // Area of central chunk
 467         node_min = blockpos_min*MAP_BLOCKSIZE;
 468         node_max = (blockpos_max+v3s16(1,1,1))*MAP_BLOCKSIZE-v3s16(1,1,1);
 469         // Full allocated area
 470         v3s16 full_node_min = (blockpos_min-1)*MAP_BLOCKSIZE;
 471         v3s16 full_node_max = (blockpos_max+2)*MAP_BLOCKSIZE-v3s16(1,1,1);
 472
 473         v3s16 central_area_size = node_max - node_min + v3s16(1,1,1);
 474
 475         const s16 max_spread_amount = MAP_BLOCKSIZE;
 476
 477         int volume_blocks = (blockpos_max.X - blockpos_min.X + 1)
 478                         * (blockpos_max.Y - blockpos_min.Y + 1)
 479                         * (blockpos_max.Z - blockpos_max.Z + 1);
 480
 481         int volume_nodes = volume_blocks *
 482                         MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
 483
 484         // Generated surface area
 485         //double gen_area_nodes = MAP_BLOCKSIZE*MAP_BLOCKSIZE * rel_volume;
 486
 487         // Horribly wrong heuristic, but better than nothing
 488         bool block_is_underground = (water_level > node_max.Y);
 489
 490         /*
 491                 Create a block-specific seed
 492         */
 493         u32 blockseed = get_blockseed(data->seed, full_node_min);
 494
 495         /*
 496                 Make some noise
 497         */
 498         {
 499                 int x = node_min.X;
 500                 int z = node_min.Z;
 501
 502                 // Need to adjust for the original implementation's +.5 offset...
 503                 if (!(flags & MG_FLAT)) {
 504                         noise_terrain_base->perlinMap2D(
 505                                 x + 0.5 * noise_terrain_base->np->spread.X,
 506                                 z + 0.5 * noise_terrain_base->np->spread.Z);
 507                         noise_terrain_base->transformNoiseMap();
 508
 509                         noise_terrain_higher->perlinMap2D(
 510                                 x + 0.5 * noise_terrain_higher->np->spread.X,
 511                                 z + 0.5 * noise_terrain_higher->np->spread.Z);
 512                         noise_terrain_higher->transformNoiseMap();
 513
 514                         noise_steepness->perlinMap2D(
 515                                 x + 0.5 * noise_steepness->np->spread.X,
 516                                 z + 0.5 * noise_steepness->np->spread.Z);
 517                         noise_steepness->transformNoiseMap();
 518
 519                         noise_height_select->perlinMap2D(
 520                                 x + 0.5 * noise_height_select->np->spread.X,
 521                                 z + 0.5 * noise_height_select->np->spread.Z);
 522                 }
 523
 524                 noise_trees->perlinMap2D(
 525                         x + 0.5 * noise_trees->np->spread.X,
 526                         z + 0.5 * noise_trees->np->spread.Z);
 527
 528                 if (!(flags & MG_FLAT)) {
 529                         noise_mud->perlinMap2D(
 530                                 x + 0.5 * noise_mud->np->spread.X,
 531                                 z + 0.5 * noise_mud->np->spread.Z);
 532                         noise_mud->transformNoiseMap();
 533                 }
 534                 noise_beach->perlinMap2D(
 535                         x + 0.2 * noise_beach->np->spread.X,
 536                         z + 0.7 * noise_beach->np->spread.Z);
 537
 538                 noise_biome->perlinMap2D(
 539                         x + 0.6 * noise_biome->np->spread.X,
 540                         z + 0.2 * noise_biome->np->spread.Z);
 541         }
 542
 543
 544         /*
 545                 Cache some ground type values for speed
 546         */
 547
 548 // Creates variables c_name=id and n_name=node
 549 #define CONTENT_VARIABLE(ndef, name)\
 550         content_t c_##name = ndef->getId("mapgen_" #name);\
 551         MapNode n_##name(c_##name);
 552 // Default to something else if was CONTENT_IGNORE
 553 #define CONTENT_VARIABLE_FALLBACK(name, dname)\
 554         if(c_##name == CONTENT_IGNORE){\
 555                 c_##name = c_##dname;\
 556                 n_##name = n_##dname;\
 557         }
 558
 559         CONTENT_VARIABLE(ndef, stone);
 560         CONTENT_VARIABLE(ndef, air);
 561         CONTENT_VARIABLE(ndef, water_source);
 562         CONTENT_VARIABLE(ndef, dirt);
 563         CONTENT_VARIABLE(ndef, sand);
 564         CONTENT_VARIABLE(ndef, gravel);
 565         CONTENT_VARIABLE(ndef, clay);
 566         CONTENT_VARIABLE(ndef, lava_source);
 567         CONTENT_VARIABLE(ndef, cobble);
 568         CONTENT_VARIABLE(ndef, mossycobble);
 569         CONTENT_VARIABLE(ndef, dirt_with_grass);
 570         CONTENT_VARIABLE(ndef, junglegrass);
 571         CONTENT_VARIABLE(ndef, stone_with_coal);
 572         CONTENT_VARIABLE(ndef, stone_with_iron);
 573         CONTENT_VARIABLE(ndef, mese);
 574         CONTENT_VARIABLE(ndef, desert_sand);
 575         CONTENT_VARIABLE_FALLBACK(desert_sand, sand);
 576         CONTENT_VARIABLE(ndef, desert_stone);
 577         CONTENT_VARIABLE_FALLBACK(desert_stone, stone);
 578
 579         // Maximum height of the stone surface and obstacles.
 580         // This is used to guide the cave generation
 581         s16 stone_surface_max_y = 0;
 582
 583         /*
 584                 Generate general ground level to full area
 585         */
 586         {
 587 #if 1
 588         TimeTaker timer1("Generating ground level");
 589
 590         for(s16 x=node_min.X; x<=node_max.X; x++)
 591         for(s16 z=node_min.Z; z<=node_max.Z; z++)
 592         {
 593                 // Node position
 594                 v2s16 p2d = v2s16(x,z);
 595
 596                 /*
 597                         Skip of already generated
 598                 */
 599                 /*{
 600                         v3s16 p(p2d.X, node_min.Y, p2d.Y);
 601                         if(vmanip.m_data[vmanip.m_area.index(p)].d != CONTENT_AIR)
 602                                 continue;
 603                 }*/
 604
 605                 // Ground height at this point
 606                 float surface_y_f = 0.0;
 607
 608                 // Use perlin noise for ground height
 609                 surface_y_f = base_rock_level_2d(data->seed, p2d);
 610
 611                 /*// Experimental stuff
 612                 {
 613                         float a = highlands_level_2d(data->seed, p2d);
 614                         if(a > surface_y_f)
 615                                 surface_y_f = a;
 616                 }*/
 617
 618                 // Convert to integer
 619                 s16 surface_y = (s16)surface_y_f;
 620
 621                 // Log it
 622                 if(surface_y > stone_surface_max_y)
 623                         stone_surface_max_y = surface_y;
 624
 625                 BiomeType bt = get_biome(data->seed, p2d);
 626                 /*
 627                         Fill ground with stone
 628                 */
 629                 {
 630                         // Use fast index incrementing
 631                         v3s16 em = vmanip.m_area.getExtent();
 632                         u32 i = vmanip.m_area.index(v3s16(p2d.X, node_min.Y, p2d.Y));
 633                         for(s16 y=node_min.Y; y<=node_max.Y; y++)
 634                         {
 635                                 if(vmanip.m_data[i].getContent() == CONTENT_IGNORE){
 636                                         if(y <= surface_y){
 637                                                 if(y > water_level && bt == BT_DESERT)
 638                                                         vmanip.m_data[i] = n_desert_stone;
 639                                                 else
 640                                                         vmanip.m_data[i] = n_stone;
 641                                         } else if(y <= water_level){
 642                                                 vmanip.m_data[i] = MapNode(c_water_source);
 643                                         } else {
 644                                                 vmanip.m_data[i] = MapNode(c_air);
 645                                         }
 646                                 }
 647                                 vmanip.m_area.add_y(em, i, 1);
 648                         }
 649                 }
 650         }
 651 #endif
 652
 653         }//timer1
 654
 655         // Limit dirt flow area by 1 because mud is flown into neighbors.
 656         assert(central_area_size.X == central_area_size.Z);
 657         s16 mudflow_minpos = 0-max_spread_amount+1;
 658         s16 mudflow_maxpos = central_area_size.X+max_spread_amount-2;
 659
 660         /*
 661                 Loop this part, it will make stuff look older and newer nicely
 662         */
 663
 664         /*double cave_amount = 6.0 + 6.0 * noise2d_perlin(
 665                         0.5+(double)node_min.X/250, 0.5+(double)node_min.Y/250,
 666                         data->seed+34329, 3, 0.50);*/
 667
 668         double cave_amount = NoisePerlin2D(np_cave, node_min.X, node_min.Y, data->seed);
 669
 670         const u32 age_loops = 2;
 671         for(u32 i_age=0; i_age<age_loops; i_age++)
 672         { // Aging loop
 673         /******************************
 674                 BEGINNING OF AGING LOOP
 675         ******************************/
 676
 677 #if 1
 678         {
 679         // 24ms @cs=8
 680         //TimeTaker timer1("caves");
 681
 682         /*
 683                 Make caves (this code is relatively horrible)
 684         */
 685         cave_amount = MYMAX(0.0, cave_amount);
 686         u32 caves_count = cave_amount * volume_nodes / 50000;
 687         u32 bruises_count = 1;
 688         PseudoRandom ps(blockseed+21343);
 689         PseudoRandom ps2(blockseed+1032);
 690         if(ps.range(1, 6) == 1)
 691                 bruises_count = ps.range(0, ps.range(0, 2));
 692         if(get_biome(data->seed, v2s16(node_min.X, node_min.Z)) == BT_DESERT){
 693                 caves_count /= 3;
 694                 bruises_count /= 3;
 695         }
 696         for(u32 jj=0; jj<caves_count+bruises_count; jj++)
 697         {
 698                 if (!(flags & MG_CAVES))
 699                         continue;
 700
 701                 /*int avg_height = (int)
 702                           ((base_rock_level_2d(data->seed, v2s16(node_min.X, node_min.Z)) +
 703                                 base_rock_level_2d(data->seed, v2s16(node_max.X, node_max.Z))) / 2);
 704                 if ((node_max.Y + node_min.Y) / 2 > avg_height)
 705                         break;*/
 706
 707                 bool large_cave = (jj >= caves_count);
 708                 s16 min_tunnel_diameter = 2;
 709                 s16 max_tunnel_diameter = ps.range(2,6);
 710                 int dswitchint = ps.range(1,14);
 711                 u16 tunnel_routepoints = 0;
 712                 int part_max_length_rs = 0;
 713                 if(large_cave){
 714                         part_max_length_rs = ps.range(2,4);
 715                         tunnel_routepoints = ps.range(5, ps.range(15,30));
 716                         min_tunnel_diameter = 5;
 717                         max_tunnel_diameter = ps.range(7, ps.range(8,24));
 718                 } else {
 719                         part_max_length_rs = ps.range(2,9);
 720                         tunnel_routepoints = ps.range(10, ps.range(15,30));
 721                 }
 722                 bool large_cave_is_flat = (ps.range(0,1) == 0);
 723
 724                 v3f main_direction(0,0,0);
 725
 726                 // Allowed route area size in nodes
 727                 v3s16 ar = central_area_size;
 728
 729                 // Area starting point in nodes
 730                 v3s16 of = node_min;
 731
 732                 // Allow a bit more
 733                 //(this should be more than the maximum radius of the tunnel)
 734                 s16 insure = 10;
 735                 s16 more = max_spread_amount - max_tunnel_diameter/2 - insure;
 736                 ar += v3s16(1,0,1) * more * 2;
 737                 of -= v3s16(1,0,1) * more;
 738
 739                 s16 route_y_min = 0;
 740                 // Allow half a diameter + 7 over stone surface
 741                 s16 route_y_max = -of.Y + stone_surface_max_y + max_tunnel_diameter/2 + 7;
 742
 743                 // Limit maximum to area
 744                 route_y_max = rangelim(route_y_max, 0, ar.Y-1);
 745
 746                 if(large_cave)
 747                 {
 748                         s16 min = 0;
 749                         if(node_min.Y < water_level && node_max.Y > water_level)
 750                         {
 751                                 min = water_level - max_tunnel_diameter/3 - of.Y;
 752                                 route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
 753                         }
 754                         route_y_min = ps.range(min, min + max_tunnel_diameter);
 755                         route_y_min = rangelim(route_y_min, 0, route_y_max);
 756                 }
 757
 758                 s16 route_start_y_min = route_y_min;
 759                 s16 route_start_y_max = route_y_max;
 760
 761                 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y-1);
 762                 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y-1);
 763
 764                 // Randomize starting position
 765                 v3f orp(
 766                         (float)(ps.next()%ar.X)+0.5,
 767                         (float)(ps.range(route_start_y_min, route_start_y_max))+0.5,
 768                         (float)(ps.next()%ar.Z)+0.5
 769                 );
 770
 771                 v3s16 startp(orp.X, orp.Y, orp.Z);
 772                 startp += of;
 773
 774                 MapNode airnode(CONTENT_AIR);
 775                 MapNode waternode(c_water_source);
 776                 MapNode lavanode(c_lava_source);
 777
 778                 /*
 779                         Generate some tunnel starting from orp
 780                 */
 781
 782                 for(u16 j=0; j<tunnel_routepoints; j++)
 783                 {
 784                         if(j%dswitchint==0 && large_cave == false)
 785                         {
 786                                 main_direction = v3f(
 787                                         ((float)(ps.next()%20)-(float)10)/10,
 788                                         ((float)(ps.next()%20)-(float)10)/30,
 789                                         ((float)(ps.next()%20)-(float)10)/10
 790                                 );
 791                                 main_direction *= (float)ps.range(0, 10)/10;
 792                         }
 793
 794                         // Randomize size
 795                         s16 min_d = min_tunnel_diameter;
 796                         s16 max_d = max_tunnel_diameter;
 797                         s16 rs = ps.range(min_d, max_d);
 798
 799                         // Every second section is rough
 800                         bool randomize_xz = (ps2.range(1,2) == 1);
 801
 802                         v3s16 maxlen;
 803                         if(large_cave)
 804                         {
 805                                 maxlen = v3s16(
 806                                         rs*part_max_length_rs,
 807                                         rs*part_max_length_rs/2,
 808                                         rs*part_max_length_rs
 809                                 );
 810                         }
 811                         else
 812                         {
 813                                 maxlen = v3s16(
 814                                         rs*part_max_length_rs,
 815                                         ps.range(1, rs*part_max_length_rs),
 816                                         rs*part_max_length_rs
 817                                 );
 818                         }
 819
 820                         v3f vec;
 821
 822                         vec = v3f(
 823                                 (float)(ps.next()%(maxlen.X*1))-(float)maxlen.X/2,
 824                                 (float)(ps.next()%(maxlen.Y*1))-(float)maxlen.Y/2,
 825                                 (float)(ps.next()%(maxlen.Z*1))-(float)maxlen.Z/2
 826                         );
 827
 828                         // Jump downward sometimes
 829                         if(!large_cave && ps.range(0,12) == 0)
 830                         {
 831                                 vec = v3f(
 832                                         (float)(ps.next()%(maxlen.X*1))-(float)maxlen.X/2,
 833                                         (float)(ps.next()%(maxlen.Y*2))-(float)maxlen.Y*2/2,
 834                                         (float)(ps.next()%(maxlen.Z*1))-(float)maxlen.Z/2
 835                                 );
 836                         }
 837
 838                         /*if(large_cave){
 839                                 v3f p = orp + vec;
 840                                 s16 h = find_ground_level_clever(vmanip,
 841                                                 v2s16(p.X, p.Z), ndef);
 842                                 route_y_min = h - rs/3;
 843                                 route_y_max = h + rs;
 844                         }*/
 845
 846                         vec += main_direction;
 847
 848                         v3f rp = orp + vec;
 849                         if(rp.X < 0)
 850                                 rp.X = 0;
 851                         else if(rp.X >= ar.X)
 852                                 rp.X = ar.X-1;
 853                         if(rp.Y < route_y_min)
 854                                 rp.Y = route_y_min;
 855                         else if(rp.Y >= route_y_max)
 856                                 rp.Y = route_y_max-1;
 857                         if(rp.Z < 0)
 858                                 rp.Z = 0;
 859                         else if(rp.Z >= ar.Z)
 860                                 rp.Z = ar.Z-1;
 861                         vec = rp - orp;
 862
 863                         for(float f=0; f<1.0; f+=1.0/vec.getLength())
 864                         {
 865                                 v3f fp = orp + vec * f;
 866                                 fp.X += 0.1*ps.range(-10,10);
 867                                 fp.Z += 0.1*ps.range(-10,10);
 868                                 v3s16 cp(fp.X, fp.Y, fp.Z);
 869
 870                                 s16 d0 = -rs/2;
 871                                 s16 d1 = d0 + rs;
 872                                 if(randomize_xz){
 873                                         d0 += ps.range(-1,1);
 874                                         d1 += ps.range(-1,1);
 875                                 }
 876                                 for(s16 z0=d0; z0<=d1; z0++)
 877                                 {
 878                                         s16 si = rs/2 - MYMAX(0, abs(z0)-rs/7-1);
 879                                         for(s16 x0=-si-ps.range(0,1); x0<=si-1+ps.range(0,1); x0++)
 880                                         {
 881                                                 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
 882                                                 s16 si2 = rs/2 - MYMAX(0, maxabsxz-rs/7-1);
 883                                                 for(s16 y0=-si2; y0<=si2; y0++)
 884                                                 {
 885                                                         /*// Make better floors in small caves
 886                                                         if(y0 <= -rs/2 && rs<=7)
 887                                                                 continue;*/
 888                                                         if(large_cave_is_flat){
 889                                                                 // Make large caves not so tall
 890                                                                 if(rs > 7 && abs(y0) >= rs/3)
 891                                                                         continue;
 892                                                         }
 893
 894                                                         s16 z = cp.Z + z0;
 895                                                         s16 y = cp.Y + y0;
 896                                                         s16 x = cp.X + x0;
 897                                                         v3s16 p(x,y,z);
 898                                                         p += of;
 899
 900                                                         if(vmanip.m_area.contains(p) == false)
 901                                                                 continue;
 902
 903                                                         u32 i = vmanip.m_area.index(p);
 904
 905                                                         if(large_cave)
 906                                                         {
 907                                                                 if(full_node_min.Y < water_level &&
 908                                                                         full_node_max.Y > water_level){
 909                                                                         if(p.Y <= water_level)
 910                                                                                 vmanip.m_data[i] = waternode;
 911                                                                         else
 912                                                                                 vmanip.m_data[i] = airnode;
 913                                                                 } else if(full_node_max.Y < water_level){
 914                                                                         if(p.Y < startp.Y - 2)
 915                                                                                 vmanip.m_data[i] = lavanode;
 916                                                                         else
 917                                                                                 vmanip.m_data[i] = airnode;
 918                                                                 } else {
 919                                                                         vmanip.m_data[i] = airnode;
 920                                                                 }
 921                                                         } else {
 922                                                                 // Don't replace air or water or lava or ignore
 923                                                                 if(vmanip.m_data[i].getContent() == CONTENT_IGNORE ||
 924                                                                 vmanip.m_data[i].getContent() == CONTENT_AIR ||
 925                                                                 vmanip.m_data[i].getContent() == c_water_source ||
 926                                                                 vmanip.m_data[i].getContent() == c_lava_source)
 927                                                                         continue;
 928
 929                                                                 vmanip.m_data[i] = airnode;
 930
 931                                                                 // Set tunnel flag
 932                                                                 vmanip.m_flags[i] |= VMANIP_FLAG_CAVE;
 933                                                         }
 934                                                 }
 935                                         }
 936                                 }
 937                         }
 938
 939                         orp = rp;
 940                 }
 941
 942         }
 943
 944         }//timer1
 945 #endif
 946
 947 #if 1
 948         {
 949         // 15ms @cs=8
 950         TimeTaker timer1("add mud");
 951
 952         /*
 953                 Add mud to the central chunk
 954         */
 955
 956         for(s16 x=node_min.X; x<=node_max.X; x++)
 957         for(s16 z=node_min.Z; z<=node_max.Z; z++)
 958         {
 959                 // Node position in 2d
 960                 v2s16 p2d = v2s16(x,z);
 961
 962                 // Randomize mud amount
 963                 s16 mud_add_amount = get_mud_add_amount(data->seed, p2d) / 2.0 + 0.5;
 964
 965                 // Find ground level
 966                 s16 surface_y = find_stone_level(vmanip, p2d, ndef);
 967                 // Handle area not found
 968                 if(surface_y == vmanip.m_area.MinEdge.Y - 1)
 969                         continue;
 970
 971                 MapNode addnode(c_dirt);
 972                 BiomeType bt = get_biome(data->seed, p2d);
 973
 974                 if(bt == BT_DESERT)
 975                         addnode = MapNode(c_desert_sand);
 976
 977                 if(bt == BT_DESERT && surface_y + mud_add_amount <= water_level+1){
 978                         addnode = MapNode(c_sand);
 979                 } else if(mud_add_amount <= 0){
 980                         mud_add_amount = 1 - mud_add_amount;
 981                         addnode = MapNode(c_gravel);
 982                 } else if(bt == BT_NORMAL && get_have_beach(data->seed, p2d) &&
 983                                 surface_y + mud_add_amount <= water_level+2){
 984                         addnode = MapNode(c_sand);
 985                 }
 986
 987                 if(bt == BT_DESERT){
 988                         if(surface_y > 20){
 989                                 mud_add_amount = MYMAX(0, mud_add_amount - (surface_y - 20)/5);
 990                         }
 991                 }
 992
 993                 /*
 994                         If topmost node is grass, change it to mud.
 995                         It might be if it was flown to there from a neighboring
 996                         chunk and then converted.
 997                 */
 998                 {
 999                         u32 i = vmanip.m_area.index(v3s16(p2d.X, surface_y, p2d.Y));
1000                         MapNode *n = &vmanip.m_data[i];
1001                         if(n->getContent() == c_dirt_with_grass)
1002                                 *n = MapNode(c_dirt);
1003                 }
1004
1005                 /*
1006                         Add mud on ground
1007                 */
1008                 {
1009                         s16 mudcount = 0;
1010                         v3s16 em = vmanip.m_area.getExtent();
1011                         s16 y_start = surface_y+1;
1012                         u32 i = vmanip.m_area.index(v3s16(p2d.X, y_start, p2d.Y));
1013                         for(s16 y=y_start; y<=node_max.Y; y++)
1014                         {
1015                                 if(mudcount >= mud_add_amount)
1016                                         break;
1017
1018                                 MapNode &n = vmanip.m_data[i];
1019                                 n = addnode;
1020                                 mudcount++;
1021
1022                                 vmanip.m_area.add_y(em, i, 1);
1023                         }
1024                 }
1025
1026         }
1027
1028         }//timer1
1029 #endif
1030
1031         /*
1032                 Add blobs of dirt and gravel underground
1033         */
1034         if(get_biome(data->seed, v2s16(node_min.X, node_min.Z)) == BT_NORMAL)
1035         {
1036         PseudoRandom pr(blockseed+983);
1037         for(int i=0; i<volume_nodes/10/10/10; i++)
1038         {
1039                 bool only_fill_cave = (myrand_range(0,1) != 0);
1040                 v3s16 size(
1041                         pr.range(1, 8),
1042                         pr.range(1, 8),
1043                         pr.range(1, 8)
1044                 );
1045                 v3s16 p0(
1046                         pr.range(node_min.X, node_max.X)-size.X/2,
1047                         pr.range(node_min.Y, node_max.Y)-size.Y/2,
1048                         pr.range(node_min.Z, node_max.Z)-size.Z/2
1049                 );
1050                 MapNode n1;
1051                 if(p0.Y > -32 && pr.range(0,1) == 0)
1052                         n1 = MapNode(c_dirt);
1053                 else
1054                         n1 = MapNode(c_gravel);
1055                 for(int x1=0; x1<size.X; x1++)
1056                 for(int y1=0; y1<size.Y; y1++)
1057                 for(int z1=0; z1<size.Z; z1++)
1058                 {
1059                         v3s16 p = p0 + v3s16(x1,y1,z1);
1060                         u32 i = vmanip.m_area.index(p);
1061                         if(!vmanip.m_area.contains(i))
1062                                 continue;
1063                         // Cancel if not stone and not cave air
1064                         if(vmanip.m_data[i].getContent() != c_stone &&
1065                                         !(vmanip.m_flags[i] & VMANIP_FLAG_CAVE))
1066                                 continue;
1067                         if(only_fill_cave && !(vmanip.m_flags[i] & VMANIP_FLAG_CAVE))
1068                                 continue;
1069                         vmanip.m_data[i] = n1;
1070                 }
1071         }
1072         }
1073
1074 #if 1
1075         {
1076         // 340ms @cs=8
1077         TimeTaker timer1("flow mud");
1078
1079         /*
1080                 Flow mud away from steep edges
1081         */
1082
1083         // Iterate a few times
1084         for(s16 k=0; k<3; k++)
1085         {
1086
1087         for(s16 x=mudflow_minpos; x<=mudflow_maxpos; x++)
1088         for(s16 z=mudflow_minpos; z<=mudflow_maxpos; z++)
1089         {
1090                 // Invert coordinates every 2nd iteration
1091                 if(k%2 == 0)
1092                 {
1093                         x = mudflow_maxpos - (x-mudflow_minpos);
1094                         z = mudflow_maxpos - (z-mudflow_minpos);
1095                 }
1096
1097                 // Node position in 2d
1098                 v2s16 p2d = v2s16(node_min.X, node_min.Z) + v2s16(x,z);
1099
1100                 v3s16 em = vmanip.m_area.getExtent();
1101                 u32 i = vmanip.m_area.index(v3s16(p2d.X, node_max.Y, p2d.Y));
1102                 s16 y=node_max.Y;
1103
1104                 while(y >= node_min.Y)
1105                 {
1106
1107                 for(;; y--)
1108                 {
1109                         MapNode *n = NULL;
1110                         // Find mud
1111                         for(; y>=node_min.Y; y--)
1112                         {
1113                                 n = &vmanip.m_data[i];
1114                                 //if(content_walkable(n->d))
1115                                 //      break;
1116                                 if(n->getContent() == c_dirt ||
1117                                                 n->getContent() == c_dirt_with_grass ||
1118                                                 n->getContent() == c_gravel)
1119                                         break;
1120
1121                                 vmanip.m_area.add_y(em, i, -1);
1122                         }
1123
1124                         // Stop if out of area
1125                         //if(vmanip.m_area.contains(i) == false)
1126                         if(y < node_min.Y)
1127                                 break;
1128
1129                         /*// If not mud, do nothing to it
1130                         MapNode *n = &vmanip.m_data[i];
1131                         if(n->d != CONTENT_MUD && n->d != CONTENT_GRASS)
1132                                 continue;*/
1133
1134                         if(n->getContent() == c_dirt ||
1135                                         n->getContent() == c_dirt_with_grass)
1136                         {
1137                                 // Make it exactly mud
1138                                 n->setContent(c_dirt);
1139
1140                                 /*
1141                                         Don't flow it if the stuff under it is not mud
1142                                 */
1143                                 {
1144                                         u32 i2 = i;
1145                                         vmanip.m_area.add_y(em, i2, -1);
1146                                         // Cancel if out of area
1147                                         if(vmanip.m_area.contains(i2) == false)
1148                                                 continue;
1149                                         MapNode *n2 = &vmanip.m_data[i2];
1150                                         if(n2->getContent() != c_dirt &&
1151                                                         n2->getContent() != c_dirt_with_grass)
1152                                                 continue;
1153                                 }
1154                         }
1155
1156                         /*s16 recurse_count = 0;
1157         mudflow_recurse:*/
1158
1159                         v3s16 dirs4[4] = {
1160                                 v3s16(0,0,1), // back
1161                                 v3s16(1,0,0), // right
1162                                 v3s16(0,0,-1), // front
1163                                 v3s16(-1,0,0), // left
1164                         };
1165
1166                         // Theck that upper is air or doesn't exist.
1167                         // Cancel dropping if upper keeps it in place
1168                         u32 i3 = i;
1169                         vmanip.m_area.add_y(em, i3, 1);
1170                         if(vmanip.m_area.contains(i3) == true
1171                                         && ndef->get(vmanip.m_data[i3]).walkable)
1172                         {
1173                                 continue;
1174                         }
1175
1176                         // Drop mud on side
1177
1178                         for(u32 di=0; di<4; di++)
1179                         {
1180                                 v3s16 dirp = dirs4[di];
1181                                 u32 i2 = i;
1182                                 // Move to side
1183                                 vmanip.m_area.add_p(em, i2, dirp);
1184                                 // Fail if out of area
1185                                 if(vmanip.m_area.contains(i2) == false)
1186                                         continue;
1187                                 // Check that side is air
1188                                 MapNode *n2 = &vmanip.m_data[i2];
1189                                 if(ndef->get(*n2).walkable)
1190                                         continue;
1191                                 // Check that under side is air
1192                                 vmanip.m_area.add_y(em, i2, -1);
1193                                 if(vmanip.m_area.contains(i2) == false)
1194                                         continue;
1195                                 n2 = &vmanip.m_data[i2];
1196                                 if(ndef->get(*n2).walkable)
1197                                         continue;
1198                                 /*// Check that under that is air (need a drop of 2)
1199                                 vmanip.m_area.add_y(em, i2, -1);
1200                                 if(vmanip.m_area.contains(i2) == false)
1201                                         continue;
1202                                 n2 = &vmanip.m_data[i2];
1203                                 if(content_walkable(n2->d))
1204                                         continue;*/
1205                                 // Loop further down until not air
1206                                 bool dropped_to_unknown = false;
1207                                 do{
1208                                         vmanip.m_area.add_y(em, i2, -1);
1209                                         n2 = &vmanip.m_data[i2];
1210                                         // if out of known area
1211                                         if(vmanip.m_area.contains(i2) == false
1212                                                         || n2->getContent() == CONTENT_IGNORE){
1213                                                 dropped_to_unknown = true;
1214                                                 break;
1215                                         }
1216                                 }while(ndef->get(*n2).walkable == false);
1217                                 // Loop one up so that we're in air
1218                                 vmanip.m_area.add_y(em, i2, 1);
1219                                 n2 = &vmanip.m_data[i2];
1220
1221                                 bool old_is_water = (n->getContent() == c_water_source);
1222                                 // Move mud to new place
1223                                 if(!dropped_to_unknown) {
1224                                         *n2 = *n;
1225                                         // Set old place to be air (or water)
1226                                         if(old_is_water)
1227                                                 *n = MapNode(c_water_source);
1228                                         else
1229                                                 *n = MapNode(CONTENT_AIR);
1230                                 }
1231
1232                                 // Done
1233                                 break;
1234                         }
1235                 }
1236                 }
1237         }
1238
1239         }
1240
1241         }//timer1
1242 #endif
1243
1244         } // Aging loop
1245         /***********************
1246                 END OF AGING LOOP
1247         ************************/
1248
1249         /*
1250                 Add top and bottom side of water to transforming_liquid queue
1251         */
1252
1253         for(s16 x=full_node_min.X; x<=full_node_max.X; x++)
1254         for(s16 z=full_node_min.Z; z<=full_node_max.Z; z++)
1255         {
1256                 // Node position
1257                 v2s16 p2d(x,z);
1258                 {
1259                         bool water_found = false;
1260                         // Use fast index incrementing
1261                         v3s16 em = vmanip.m_area.getExtent();
1262                         u32 i = vmanip.m_area.index(v3s16(p2d.X, full_node_max.Y, p2d.Y));
1263                         for(s16 y=full_node_max.Y; y>=full_node_min.Y; y--)
1264                         {
1265                                 if(y == full_node_max.Y){
1266                                         water_found =
1267                                                 (vmanip.m_data[i].getContent() == c_water_source ||
1268                                                 vmanip.m_data[i].getContent() == c_lava_source);
1269                                 }
1270                                 else if(water_found == false)
1271                                 {
1272                                         if(vmanip.m_data[i].getContent() == c_water_source ||
1273                                                         vmanip.m_data[i].getContent() == c_lava_source)
1274                                         {
1275                                                 v3s16 p = v3s16(p2d.X, y, p2d.Y);
1276                                                 data->transforming_liquid.push_back(p);
1277                                                 water_found = true;
1278                                         }
1279                                 }
1280                                 else
1281                                 {
1282                                         // This can be done because water_found can only
1283                                         // turn to true and end up here after going through
1284                                         // a single block.
1285                                         if(vmanip.m_data[i+1].getContent() != c_water_source ||
1286                                                         vmanip.m_data[i+1].getContent() != c_lava_source)
1287                                         {
1288                                                 v3s16 p = v3s16(p2d.X, y+1, p2d.Y);
1289                                                 data->transforming_liquid.push_back(p);
1290                                                 water_found = false;
1291                                         }
1292                                 }
1293
1294                                 vmanip.m_area.add_y(em, i, -1);
1295                         }
1296                 }
1297         }
1298
1299         /*
1300                 Grow grass
1301         */
1302
1303         for(s16 x=full_node_min.X; x<=full_node_max.X; x++)
1304         for(s16 z=full_node_min.Z; z<=full_node_max.Z; z++)
1305         {
1306                 // Node position in 2d
1307                 v2s16 p2d = v2s16(x,z);
1308
1309                 /*
1310                         Find the lowest surface to which enough light ends up
1311                         to make grass grow.
1312
1313                         Basically just wait until not air and not leaves.
1314                 */
1315                 s16 surface_y = 0;
1316                 {
1317                         v3s16 em = vmanip.m_area.getExtent();
1318                         u32 i = vmanip.m_area.index(v3s16(p2d.X, node_max.Y, p2d.Y));
1319                         s16 y;
1320                         // Go to ground level
1321                         for(y=node_max.Y; y>=full_node_min.Y; y--)
1322                         {
1323                                 MapNode &n = vmanip.m_data[i];
1324                                 if(ndef->get(n).param_type != CPT_LIGHT
1325                                                 || ndef->get(n).liquid_type != LIQUID_NONE)
1326                                         break;
1327                                 vmanip.m_area.add_y(em, i, -1);
1328                         }
1329                         if(y >= full_node_min.Y)
1330                                 surface_y = y;
1331                         else
1332                                 surface_y = full_node_min.Y;
1333                 }
1334
1335                 u32 i = vmanip.m_area.index(p2d.X, surface_y, p2d.Y);
1336                 MapNode *n = &vmanip.m_data[i];
1337                 if(n->getContent() == c_dirt){
1338                         // Well yeah, this can't be overground...
1339                         if(surface_y < water_level - 20)
1340                                 continue;
1341                         n->setContent(c_dirt_with_grass);
1342                 }
1343         }
1344
1345         /*
1346                 Generate some trees
1347         */
1348         assert(central_area_size.X == central_area_size.Z);
1349         if (flags & MG_TREES) {
1350                 // Divide area into parts
1351                 s16 div = 8;
1352                 s16 sidelen = central_area_size.X / div;
1353                 double area = sidelen * sidelen;
1354                 for(s16 x0=0; x0<div; x0++)
1355                 for(s16 z0=0; z0<div; z0++)
1356                 {
1357                         // Center position of part of division
1358                         v2s16 p2d_center(
1359                                 node_min.X + sidelen/2 + sidelen*x0,
1360                                 node_min.Z + sidelen/2 + sidelen*z0
1361                         );
1362                         // Minimum edge of part of division
1363                         v2s16 p2d_min(
1364                                 node_min.X + sidelen*x0,
1365                                 node_min.Z + sidelen*z0
1366                         );
1367                         // Maximum edge of part of division
1368                         v2s16 p2d_max(
1369                                 node_min.X + sidelen + sidelen*x0 - 1,
1370                                 node_min.Z + sidelen + sidelen*z0 - 1
1371                         );
1372                         // Amount of trees
1373                         u32 tree_count = area * tree_amount_2d(data->seed, p2d_center);
1374                         // Put trees in random places on part of division
1375                         for(u32 i=0; i<tree_count; i++)
1376                         {
1377                                 s16 x = myrand_range(p2d_min.X, p2d_max.X);
1378                                 s16 z = myrand_range(p2d_min.Y, p2d_max.Y);
1379                                 s16 y = find_ground_level(vmanip, v2s16(x,z), ndef);
1380                                 // Don't make a tree under water level
1381                                 if(y < water_level)
1382                                         continue;
1383                                 // Don't make a tree so high that it doesn't fit
1384                                 if(y > node_max.Y - 6)
1385                                         continue;
1386                                 v3s16 p(x,y,z);
1387                                 /*
1388                                         Trees grow only on mud and grass
1389                                 */
1390                                 {
1391                                         u32 i = vmanip.m_area.index(v3s16(p));
1392                                         MapNode *n = &vmanip.m_data[i];
1393                                         if(n->getContent() != c_dirt
1394                                                         && n->getContent() != c_dirt_with_grass)
1395                                                 continue;
1396                                 }
1397                                 p.Y++;
1398                                 // Make a tree
1399                                 make_tree(vmanip, p, false, ndef);
1400                         }
1401                 }
1402         }
1403
1404
1405         /*
1406                 Calculate lighting
1407         */
1408         {
1409         ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update",
1410                         SPT_AVG);
1411         //VoxelArea a(node_min, node_max);
1412         VoxelArea a(node_min-v3s16(1,0,1)*MAP_BLOCKSIZE,
1413                         node_max+v3s16(1,0,1)*MAP_BLOCKSIZE);
1414         /*VoxelArea a(node_min-v3s16(1,0,1)*MAP_BLOCKSIZE/2,
1415                         node_max+v3s16(1,0,1)*MAP_BLOCKSIZE/2);*/
1416         enum LightBank banks[2] = {LIGHTBANK_DAY, LIGHTBANK_NIGHT};
1417         for(int i=0; i<2; i++)
1418         {
1419                 enum LightBank bank = banks[i];
1420
1421                 core::map<v3s16, bool> light_sources;
1422                 core::map<v3s16, u8> unlight_from;
1423
1424                 voxalgo::clearLightAndCollectSources(vmanip, a, bank, ndef,
1425                                 light_sources, unlight_from);
1426
1427                 bool inexistent_top_provides_sunlight = !block_is_underground;
1428                 voxalgo::SunlightPropagateResult res = voxalgo::propagateSunlight(
1429                                 vmanip, a, inexistent_top_provides_sunlight,
1430                                 light_sources, ndef);
1431                 // TODO: Do stuff according to bottom_sunlight_valid
1432
1433                 vmanip.unspreadLight(bank, unlight_from, light_sources, ndef);
1434
1435                 vmanip.spreadLight(bank, light_sources, ndef);
1436         }
1437         }
1438 }