src/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2010-2015 paramat, Matt Gregory
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21
  22 #include "mapgen.h"
  23 #include "voxel.h"
  24 #include "noise.h"
  25 #include "mapblock.h"
  26 #include "mapnode.h"
  27 #include "map.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "voxelalgorithms.h"
  31 //#include "profiler.h" // For TimeTaker
  32 #include "settings.h" // For g_settings
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.h"
  36 #include "treegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_v7.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_v7[] = {
  44         {"mountains", MGV7_MOUNTAINS},
  45         {"ridges",    MGV7_RIDGES},
  46         {NULL,        0}
  47 };
  48
  49
  50 ///////////////////////////////////////////////////////////////////////////////
  51
  52
  53 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  54         : Mapgen(mapgenid, params, emerge)
  55 {
  56         this->m_emerge = emerge;
  57         this->bmgr     = emerge->biomemgr;
  58
  59         //// amount of elements to skip for the next index
  60         //// for noise/height/biome maps (not vmanip)
  61         this->ystride = csize.X;
  62         // 1-up 1-down overgeneration
  63         this->zstride_1u1d = csize.X * (csize.Y + 2);
  64         // 1-down overgeneration
  65         this->zstride_1d = csize.X * (csize.Y + 1);
  66
  67         this->biomemap        = new u8[csize.X * csize.Z];
  68         this->heightmap       = new s16[csize.X * csize.Z];
  69         this->heatmap         = NULL;
  70         this->humidmap        = NULL;
  71         this->ridge_heightmap = new s16[csize.X * csize.Z];
  72
  73         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  74
  75         this->spflags    = sp->spflags;
  76         this->cave_width = sp->cave_width;
  77
  78         //// Terrain noise
  79         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  80         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  81         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  82         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  83         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  84         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  85         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  86
  87         //// 3d terrain noise
  88         // 1-up 1-down overgeneration
  89         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  90         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  91         // 1-down overgeneraion
  92         noise_cave1    = new Noise(&sp->np_cave1,    seed, csize.X, csize.Y + 1, csize.Z);
  93         noise_cave2    = new Noise(&sp->np_cave2,    seed, csize.X, csize.Y + 1, csize.Z);
  94
  95         //// Biome noise
  96         noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
  97         noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
  98         noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
  99         noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
 100
 101         //// Resolve nodes to be used
 102         INodeDefManager *ndef = emerge->ndef;
 103
 104         c_stone                = ndef->getId("mapgen_stone");
 105         c_water_source         = ndef->getId("mapgen_water_source");
 106         c_lava_source          = ndef->getId("mapgen_lava_source");
 107         c_desert_stone         = ndef->getId("mapgen_desert_stone");
 108         c_ice                  = ndef->getId("mapgen_ice");
 109         c_sandstone            = ndef->getId("mapgen_sandstone");
 110
 111         c_cobble               = ndef->getId("mapgen_cobble");
 112         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
 113         c_mossycobble          = ndef->getId("mapgen_mossycobble");
 114         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
 115         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
 116
 117         if (c_ice == CONTENT_IGNORE)
 118                 c_ice = CONTENT_AIR;
 119         if (c_mossycobble == CONTENT_IGNORE)
 120                 c_mossycobble = c_cobble;
 121         if (c_stair_cobble == CONTENT_IGNORE)
 122                 c_stair_cobble = c_cobble;
 123         if (c_sandstonebrick == CONTENT_IGNORE)
 124                 c_sandstonebrick = c_sandstone;
 125         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 126                 c_stair_sandstonebrick = c_sandstone;
 127 }
 128
 129
 130 MapgenV7::~MapgenV7()
 131 {
 132         delete noise_terrain_base;
 133         delete noise_terrain_persist;
 134         delete noise_height_select;
 135         delete noise_terrain_alt;
 136         delete noise_filler_depth;
 137         delete noise_mount_height;
 138         delete noise_ridge_uwater;
 139         delete noise_mountain;
 140         delete noise_ridge;
 141         delete noise_cave1;
 142         delete noise_cave2;
 143
 144         delete noise_heat;
 145         delete noise_humidity;
 146         delete noise_heat_blend;
 147         delete noise_humidity_blend;
 148
 149         delete[] ridge_heightmap;
 150         delete[] heightmap;
 151         delete[] biomemap;
 152 }
 153
 154
 155 MapgenV7Params::MapgenV7Params()
 156 {
 157         spflags    = MGV7_MOUNTAINS | MGV7_RIDGES;
 158         cave_width = 0.3;
 159
 160         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 161         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 162         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 163         np_height_select   = NoiseParams(-8,   16,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 164         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 165         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 166         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 167         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 168         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 169         np_cave1           = NoiseParams(0,    12,  v3f(96,   96,   96),   52534, 4, 0.5,  2.0);
 170         np_cave2           = NoiseParams(0,    12,  v3f(96,   96,   96),   10325, 4, 0.5,  2.0);
 171 }
 172
 173
 174 void MapgenV7Params::readParams(const Settings *settings)
 175 {
 176         settings->getFlagStrNoEx("mgv7_spflags",  spflags, flagdesc_mapgen_v7);
 177         settings->getFloatNoEx("mgv7_cave_width", cave_width);
 178
 179         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 180         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 181         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 182         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 183         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 184         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 185         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 186         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 187         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 188         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 189         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 190 }
 191
 192
 193 void MapgenV7Params::writeParams(Settings *settings) const
 194 {
 195         settings->setFlagStr("mgv7_spflags",  spflags, flagdesc_mapgen_v7, U32_MAX);
 196         settings->setFloat("mgv7_cave_width", cave_width);
 197
 198         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 199         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 200         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 201         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 202         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 203         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 204         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 205         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 206         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 207         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 208         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 209 }
 210
 211
 212 ///////////////////////////////////////////////////////////////////////////////
 213
 214
 215 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 216 {
 217         // Base terrain calculation
 218         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 219
 220         // Ridge/river terrain calculation
 221         float width = 0.2;
 222         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 223         // if inside a river this is an unsuitable spawn point
 224         if (fabs(uwatern) <= width)
 225                 return MAX_MAP_GENERATION_LIMIT;
 226
 227         // Mountain terrain calculation
 228         int iters = 128;
 229         while (iters--) {
 230                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // Air, y is ground level
 231                         if (y <= water_level || y > water_level + 16)
 232                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 233                         else
 234                                 return y;
 235                 }
 236                 y++;
 237         }
 238
 239         // Unsuitable spawn point, no ground surface found
 240         return MAX_MAP_GENERATION_LIMIT;
 241 }
 242
 243
 244 void MapgenV7::makeChunk(BlockMakeData *data)
 245 {
 246         // Pre-conditions
 247         assert(data->vmanip);
 248         assert(data->nodedef);
 249         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 250                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 251                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 252         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 253                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 254                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 255
 256         this->generating = true;
 257         this->vm   = data->vmanip;
 258         this->ndef = data->nodedef;
 259         //TimeTaker t("makeChunk");
 260
 261         v3s16 blockpos_min = data->blockpos_min;
 262         v3s16 blockpos_max = data->blockpos_max;
 263         node_min = blockpos_min * MAP_BLOCKSIZE;
 264         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 265         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 266         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 267
 268         blockseed = getBlockSeed2(full_node_min, seed);
 269
 270         // Make some noise
 271         calculateNoise();
 272
 273         // Generate terrain and ridges with initial heightmaps
 274         s16 stone_surface_max_y = generateTerrain();
 275
 276         if (spflags & MGV7_RIDGES)
 277                 generateRidgeTerrain();
 278
 279         // Update heightmap to include mountain terrain
 280         updateHeightmap(node_min, node_max);
 281
 282         // Create biomemap at heightmap surface
 283         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 284                 noise_humidity->result, heightmap, biomemap);
 285
 286         // Actually place the biome-specific nodes
 287         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 288
 289         if (flags & MG_CAVES)
 290                 generateCaves(stone_surface_max_y);
 291
 292         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 293                 DungeonParams dp;
 294
 295                 dp.np_rarity  = nparams_dungeon_rarity;
 296                 dp.np_density = nparams_dungeon_density;
 297                 dp.np_wetness = nparams_dungeon_wetness;
 298                 dp.c_water    = c_water_source;
 299                 if (stone_type == STONE) {
 300                         dp.c_cobble = c_cobble;
 301                         dp.c_moss   = c_mossycobble;
 302                         dp.c_stair  = c_stair_cobble;
 303
 304                         dp.diagonal_dirs = false;
 305                         dp.mossratio     = 3.0;
 306                         dp.holesize      = v3s16(1, 2, 1);
 307                         dp.roomsize      = v3s16(0, 0, 0);
 308                         dp.notifytype    = GENNOTIFY_DUNGEON;
 309                 } else if (stone_type == DESERT_STONE) {
 310                         dp.c_cobble = c_desert_stone;
 311                         dp.c_moss   = c_desert_stone;
 312                         dp.c_stair  = c_desert_stone;
 313
 314                         dp.diagonal_dirs = true;
 315                         dp.mossratio     = 0.0;
 316                         dp.holesize      = v3s16(2, 3, 2);
 317                         dp.roomsize      = v3s16(2, 5, 2);
 318                         dp.notifytype    = GENNOTIFY_TEMPLE;
 319                 } else if (stone_type == SANDSTONE) {
 320                         dp.c_cobble = c_sandstonebrick;
 321                         dp.c_moss   = c_sandstonebrick;
 322                         dp.c_stair  = c_sandstonebrick;
 323
 324                         dp.diagonal_dirs = false;
 325                         dp.mossratio     = 0.0;
 326                         dp.holesize      = v3s16(2, 2, 2);
 327                         dp.roomsize      = v3s16(2, 0, 2);
 328                         dp.notifytype    = GENNOTIFY_DUNGEON;
 329                 }
 330
 331                 DungeonGen dgen(this, &dp);
 332                 dgen.generate(blockseed, full_node_min, full_node_max);
 333         }
 334
 335         // Generate the registered decorations
 336         if (flags & MG_DECORATIONS)
 337                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 338
 339         // Generate the registered ores
 340         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 341
 342         // Sprinkle some dust on top after everything else was generated
 343         dustTopNodes();
 344
 345         //printf("makeChunk: %dms\n", t.stop());
 346
 347         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 348
 349         if (flags & MG_LIGHT)
 350                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 351                         full_node_min, full_node_max);
 352
 353         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 354         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 355
 356         this->generating = false;
 357 }
 358
 359
 360 void MapgenV7::calculateNoise()
 361 {
 362         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 363         s16 x = node_min.X;
 364         s16 y = node_min.Y - 1;
 365         s16 z = node_min.Z;
 366
 367         noise_terrain_persist->perlinMap2D(x, z);
 368         float *persistmap = noise_terrain_persist->result;
 369
 370         noise_terrain_base->perlinMap2D(x, z, persistmap);
 371         noise_terrain_alt->perlinMap2D(x, z, persistmap);
 372         noise_height_select->perlinMap2D(x, z);
 373
 374         if (spflags & MGV7_MOUNTAINS) {
 375                 noise_mountain->perlinMap3D(x, y, z);
 376                 noise_mount_height->perlinMap2D(x, z);
 377         }
 378
 379         if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
 380                 noise_ridge->perlinMap3D(x, y, z);
 381                 noise_ridge_uwater->perlinMap2D(x, z);
 382         }
 383
 384         // Cave noises are calculated in generateCaves()
 385         // only if solid terrain is present in mapchunk
 386
 387         noise_filler_depth->perlinMap2D(x, z);
 388         noise_heat->perlinMap2D(x, z);
 389         noise_humidity->perlinMap2D(x, z);
 390         noise_heat_blend->perlinMap2D(x, z);
 391         noise_humidity_blend->perlinMap2D(x, z);
 392
 393         for (s32 i = 0; i < csize.X * csize.Z; i++) {
 394                 noise_heat->result[i] += noise_heat_blend->result[i];
 395                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 396         }
 397
 398         heatmap = noise_heat->result;
 399         humidmap = noise_humidity->result;
 400         //printf("calculateNoise: %dus\n", t.stop());
 401 }
 402
 403
 404 Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
 405 {
 406         float heat = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed) +
 407                 NoisePerlin2D(&noise_heat_blend->np, p.X, p.Z, seed);
 408         float humidity = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed) +
 409                 NoisePerlin2D(&noise_humidity_blend->np, p.X, p.Z, seed);
 410         s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
 411
 412         return bmgr->getBiome(heat, humidity, groundlevel);
 413 }
 414
 415
 416 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 417 {
 418         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 419         hselect = rangelim(hselect, 0.0, 1.0);
 420
 421         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 422
 423         noise_terrain_base->np.persist = persist;
 424         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 425
 426         noise_terrain_alt->np.persist = persist;
 427         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 428
 429         if (height_alt > height_base)
 430                 return height_alt;
 431
 432         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 433 }
 434
 435
 436 float MapgenV7::baseTerrainLevelFromMap(int index)
 437 {
 438         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 439         float height_base = noise_terrain_base->result[index];
 440         float height_alt  = noise_terrain_alt->result[index];
 441
 442         if (height_alt > height_base)
 443                 return height_alt;
 444
 445         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 446 }
 447
 448
 449 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 450 {
 451         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 452         float density_gradient = -((float)y / mnt_h_n);
 453         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 454
 455         return mnt_n + density_gradient >= 0.0;
 456 }
 457
 458
 459 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 460 {
 461         float mounthn = noise_mount_height->result[idx_xz];
 462         float density_gradient = -((float)y / mounthn);
 463         float mountn = noise_mountain->result[idx_xyz];
 464
 465         return mountn + density_gradient >= 0.0;
 466 }
 467
 468
 469 int MapgenV7::generateTerrain()
 470 {
 471         MapNode n_air(CONTENT_AIR);
 472         MapNode n_stone(c_stone);
 473         MapNode n_water(c_water_source);
 474
 475         v3s16 em = vm->m_area.getExtent();
 476         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 477         u32 index2d = 0;
 478         bool mountain_flag = spflags & MGV7_MOUNTAINS;
 479
 480         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 481         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 482                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 483                 heightmap[index2d]       = surface_y;  // Create base terrain heightmap
 484                 ridge_heightmap[index2d] = surface_y;
 485
 486                 if (surface_y > stone_surface_max_y)
 487                         stone_surface_max_y = surface_y;
 488
 489                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 490                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 491
 492                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 493                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 494                                 if (y <= surface_y) {
 495                                         vm->m_data[vi] = n_stone;  // Base terrain
 496                                 } else if (mountain_flag &&
 497                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 498                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 499                                         if (y > stone_surface_max_y)
 500                                                 stone_surface_max_y = y;
 501                                 } else if (y <= water_level) {
 502                                         vm->m_data[vi] = n_water;
 503                                 } else {
 504                                         vm->m_data[vi] = n_air;
 505                                 }
 506                         }
 507                         vm->m_area.add_y(em, vi, 1);
 508                         index3d += ystride;
 509                 }
 510         }
 511
 512         return stone_surface_max_y;
 513 }
 514
 515
 516 void MapgenV7::generateRidgeTerrain()
 517 {
 518         if (node_max.Y < water_level - 16)
 519                 return;
 520
 521         MapNode n_water(c_water_source);
 522         MapNode n_air(CONTENT_AIR);
 523         u32 index = 0;
 524         float width = 0.2;
 525
 526         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 527         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 528                 u32 vi = vm->m_area.index(node_min.X, y, z);
 529                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 530                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 531
 532                         if (heightmap[j] < water_level - 16)  // Use base terrain heightmap
 533                                 continue;
 534
 535                         float uwatern = noise_ridge_uwater->result[j] * 2;
 536                         if (fabs(uwatern) > width)
 537                                 continue;
 538
 539                         float altitude = y - water_level;
 540                         float height_mod = (altitude + 17) / 2.5;
 541                         float width_mod  = width - fabs(uwatern);
 542                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 543
 544                         if (nridge + width_mod * height_mod < 0.6)
 545                                 continue;
 546
 547                         if (y < ridge_heightmap[j])
 548                                 ridge_heightmap[j] = y - 1;
 549
 550                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 551                 }
 552         }
 553 }
 554
 555
 556 MgStoneType MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
 557 {
 558         v3s16 em = vm->m_area.getExtent();
 559         u32 index = 0;
 560         MgStoneType stone_type = STONE;
 561
 562         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 563         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 564                 Biome *biome = NULL;
 565                 u16 depth_top = 0;
 566                 u16 base_filler = 0;
 567                 u16 depth_water_top = 0;
 568                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 569
 570                 // Check node at base of mapchunk above, either a node of a previously
 571                 // generated mapchunk or if not, a node of overgenerated base terrain.
 572                 content_t c_above = vm->m_data[vi + em.X].getContent();
 573                 bool air_above = c_above == CONTENT_AIR;
 574                 bool water_above = c_above == c_water_source;
 575
 576                 // If there is air or water above enable top/filler placement, otherwise force
 577                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 578                 u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
 579
 580                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 581                         content_t c = vm->m_data[vi].getContent();
 582
 583                         // Biome is recalculated each time an upper surface is detected while
 584                         // working down a column. The selected biome then remains in effect for
 585                         // all nodes below until the next surface and biome recalculation.
 586                         // Biome is recalculated:
 587                         // 1. At the surface of stone below air or water.
 588                         // 2. At the surface of water below air.
 589                         // 3. When stone or water is detected but biome has not yet been calculated.
 590                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 591                                         (c == c_water_source && (air_above || !biome))) {
 592                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 593                                 depth_top = biome->depth_top;
 594                                 base_filler = MYMAX(depth_top + biome->depth_filler
 595                                                 + noise_filler_depth->result[index], 0);
 596                                 depth_water_top = biome->depth_water_top;
 597
 598                                 // Detect stone type for dungeons during every biome calculation.
 599                                 // This is more efficient than detecting per-node and will not
 600                                 // miss any desert stone or sandstone biomes.
 601                                 if (biome->c_stone == c_desert_stone)
 602                                         stone_type = DESERT_STONE;
 603                                 else if (biome->c_stone == c_sandstone)
 604                                         stone_type = SANDSTONE;
 605                         }
 606
 607                         if (c == c_stone) {
 608                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 609
 610                                 // If the node below isn't solid, make this node stone, so that
 611                                 // any top/filler nodes above are structurally supported.
 612                                 // This is done by aborting the cycle of top/filler placement
 613                                 // immediately by forcing nplaced to stone level.
 614                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 615                                         nplaced = U16_MAX;
 616
 617                                 if (nplaced < depth_top) {
 618                                         vm->m_data[vi] = MapNode(biome->c_top);
 619                                         nplaced++;
 620                                 } else if (nplaced < base_filler) {
 621                                         vm->m_data[vi] = MapNode(biome->c_filler);
 622                                         nplaced++;
 623                                 } else {
 624                                         vm->m_data[vi] = MapNode(biome->c_stone);
 625                                 }
 626
 627                                 air_above = false;
 628                                 water_above = false;
 629                         } else if (c == c_water_source) {
 630                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 631                                                 biome->c_water_top : biome->c_water);
 632                                 nplaced = 0;  // Enable top/filler placement for next surface
 633                                 air_above = false;
 634                                 water_above = true;
 635                         } else if (c == CONTENT_AIR) {
 636                                 nplaced = 0;  // Enable top/filler placement for next surface
 637                                 air_above = true;
 638                                 water_above = false;
 639                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 640                                 nplaced = U16_MAX;  // Disable top/filler placement
 641                                 air_above = false;
 642                                 water_above = false;
 643                         }
 644
 645                         vm->m_area.add_y(em, vi, -1);
 646                 }
 647         }
 648
 649         return stone_type;
 650 }
 651
 652
 653 void MapgenV7::dustTopNodes()
 654 {
 655         if (node_max.Y < water_level)
 656                 return;
 657
 658         v3s16 em = vm->m_area.getExtent();
 659         u32 index = 0;
 660
 661         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 662         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 663                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 664
 665                 if (biome->c_dust == CONTENT_IGNORE)
 666                         continue;
 667
 668                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 669                 content_t c_full_max = vm->m_data[vi].getContent();
 670                 s16 y_start;
 671
 672                 if (c_full_max == CONTENT_AIR) {
 673                         y_start = full_node_max.Y - 1;
 674                 } else if (c_full_max == CONTENT_IGNORE) {
 675                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 676                         content_t c_max = vm->m_data[vi].getContent();
 677
 678                         if (c_max == CONTENT_AIR)
 679                                 y_start = node_max.Y;
 680                         else
 681                                 continue;
 682                 } else {
 683                         continue;
 684                 }
 685
 686                 vi = vm->m_area.index(x, y_start, z);
 687                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 688                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 689                                 break;
 690
 691                         vm->m_area.add_y(em, vi, -1);
 692                 }
 693
 694                 content_t c = vm->m_data[vi].getContent();
 695                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 696                         vm->m_area.add_y(em, vi, 1);
 697                         vm->m_data[vi] = MapNode(biome->c_dust);
 698                 }
 699         }
 700 }
 701
 702
 703 void MapgenV7::generateCaves(s16 max_stone_y)
 704 {
 705         if (max_stone_y < node_min.Y)
 706                 return;
 707
 708         noise_cave1->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 709         noise_cave2->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 710
 711         v3s16 em = vm->m_area.getExtent();
 712         u32 index2d = 0;
 713
 714         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 715         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 716                 bool column_is_open = false;  // Is column open to overground
 717                 bool is_tunnel = false;  // Is tunnel or tunnel floor
 718                 // Indexes at column top (node_max.Y)
 719                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 720                 u32 index3d = (z - node_min.Z) * zstride_1d + csize.Y * ystride +
 721                         (x - node_min.X);
 722                 // Biome of column
 723                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index2d]);
 724
 725                 // Don't excavate the overgenerated stone at node_max.Y + 1,
 726                 // this creates a 'roof' over the tunnel, preventing light in
 727                 // tunnels at mapchunk borders when generating mapchunks upwards.
 728                 // This 'roof' is removed when the mapchunk above is generated.
 729                 for (s16 y = node_max.Y; y >= node_min.Y - 1; y--,
 730                                 index3d -= ystride,
 731                                 vm->m_area.add_y(em, vi, -1)) {
 732
 733                         content_t c = vm->m_data[vi].getContent();
 734                         if (c == CONTENT_AIR || c == biome->c_water_top ||
 735                                         c == biome->c_water) {
 736                                 column_is_open = true;
 737                                 continue;
 738                         }
 739                         // Ground
 740                         float d1 = contour(noise_cave1->result[index3d]);
 741                         float d2 = contour(noise_cave2->result[index3d]);
 742
 743                         if (d1 * d2 > cave_width && ndef->get(c).is_ground_content) {
 744                                 // In tunnel and ground content, excavate
 745                                 vm->m_data[vi] = MapNode(CONTENT_AIR);
 746                                 is_tunnel = true;
 747                         } else {
 748                                 // Not in tunnel or not ground content
 749                                 if (is_tunnel && column_is_open &&
 750                                                 (c == biome->c_filler || c == biome->c_stone))
 751                                         // Tunnel entrance floor
 752                                         vm->m_data[vi] = MapNode(biome->c_top);
 753
 754                                 column_is_open = false;
 755                                 is_tunnel = false;
 756                         }
 757                 }
 758         }
 759
 760         if (node_min.Y >= water_level)
 761                 return;
 762
 763         PseudoRandom ps(blockseed + 21343);
 764         u32 bruises_count = ps.range(0, 2);
 765         for (u32 i = 0; i < bruises_count; i++) {
 766                 CaveV7 cave(this, &ps);
 767                 cave.makeCave(node_min, node_max, max_stone_y);
 768         }
 769 }
 770
 771
 772 ///////////////////////////////////////////////////////////////
 773
 774
 775 #if 0
 776 int MapgenV7::generateMountainTerrain(s16 ymax)
 777 {
 778         MapNode n_stone(c_stone);
 779         u32 j = 0;
 780
 781         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 782         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 783                 u32 vi = vm->m_area.index(node_min.X, y, z);
 784                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 785                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 786                         content_t c = vm->m_data[vi].getContent();
 787
 788                         if (getMountainTerrainFromMap(j, index, y)
 789                                         && (c == CONTENT_AIR || c == c_water_source)) {
 790                                 vm->m_data[vi] = n_stone;
 791                                 if (y > ymax)
 792                                         ymax = y;
 793                         }
 794
 795                         vi++;
 796                         j++;
 797                 }
 798         }
 799
 800         return ymax;
 801 }
 802 #endif
 803
 804
 805 #if 0
 806 void MapgenV7::carveRivers() {
 807         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 808         MapNode n_stone(c_stone);
 809         u32 index = 0;
 810
 811         int river_depth = 4;
 812
 813         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 814         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 815                 float terrain_mod  = noise_terrain_mod->result[index];
 816                 NoiseParams *np = noise_terrain_river->np;
 817                 np.persist = noise_terrain_persist->result[index];
 818                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 819                 float height = terrain_river * (1 - abs(terrain_mod)) *
 820                                                 noise_terrain_river->np.scale;
 821                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 822
 823                 s16 y = heightmap[index];
 824                 if (height < 1.0 && y > river_depth &&
 825                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 826
 827                         for (s16 ry = y; ry != y - river_depth; ry--) {
 828                                 u32 vi = vm->m_area.index(x, ry, z);
 829                                 vm->m_data[vi] = n_air;
 830                         }
 831
 832                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 833                         vm->m_data[vi] = n_water_source;
 834                 }
 835         }
 836 }
 837 #endif
 838
 839
 840 #if 0
 841 void MapgenV7::addTopNodes()
 842 {
 843         v3s16 em = vm->m_area.getExtent();
 844         s16 ntopnodes;
 845         u32 index = 0;
 846
 847         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 848         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 849                 Biome *biome = bmgr->biomes[biomemap[index]];
 850
 851                 //////////////////// First, add top nodes below the ridge
 852                 s16 y = ridge_heightmap[index];
 853
 854                 // This cutoff is good enough, but not perfect.
 855                 // It will cut off potentially placed top nodes at chunk boundaries
 856                 if (y < node_min.Y)
 857                         continue;
 858                 if (y > node_max.Y) {
 859                         y = node_max.Y; // Let's see if we can still go downward anyway
 860                         u32 vi = vm->m_area.index(x, y, z);
 861                         content_t c = vm->m_data[vi].getContent();
 862                         if (ndef->get(c).walkable)
 863                                 continue;
 864                 }
 865
 866                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 867                 // might not be the actual height, just the lowest part in the chunk
 868                 // where a ridge had been carved
 869                 u32 i = vm->m_area.index(x, y, z);
 870                 for (; y >= node_min.Y; y--) {
 871                         content_t c = vm->m_data[i].getContent();
 872                         if (ndef->get(c).walkable)
 873                                 break;
 874                         vm->m_area.add_y(em, i, -1);
 875                 }
 876
 877                 if (y != node_min.Y - 1 && y >= water_level) {
 878                         ridge_heightmap[index] = y; //update ridgeheight
 879                         ntopnodes = biome->top_depth;
 880                         for (; y <= node_max.Y && ntopnodes; y++) {
 881                                 ntopnodes--;
 882                                 vm->m_data[i] = MapNode(biome->c_top);
 883                                 vm->m_area.add_y(em, i, 1);
 884                         }
 885                         // If dirt, grow grass on it.
 886                         if (y > water_level - 10 &&
 887                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 888                                 vm->m_area.add_y(em, i, -1);
 889                                 if (vm->m_data[i].getContent() == c_dirt)
 890                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 891                         }
 892                 }
 893
 894                 //////////////////// Now, add top nodes on top of the ridge
 895                 y = heightmap[index];
 896                 if (y > node_max.Y) {
 897                         y = node_max.Y; // Let's see if we can still go downward anyway
 898                         u32 vi = vm->m_area.index(x, y, z);
 899                         content_t c = vm->m_data[vi].getContent();
 900                         if (ndef->get(c).walkable)
 901                                 continue;
 902                 }
 903
 904                 i = vm->m_area.index(x, y, z);
 905                 for (; y >= node_min.Y; y--) {
 906                         content_t c = vm->m_data[i].getContent();
 907                         if (ndef->get(c).walkable)
 908                                 break;
 909                         vm->m_area.add_y(em, i, -1);
 910                 }
 911
 912                 if (y != node_min.Y - 1) {
 913                         ntopnodes = biome->top_depth;
 914                         // Let's see if we've already added it...
 915                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 916                                 continue;
 917
 918                         for (; y <= node_max.Y && ntopnodes; y++) {
 919                                 ntopnodes--;
 920                                 vm->m_data[i] = MapNode(biome->c_top);
 921                                 vm->m_area.add_y(em, i, 1);
 922                         }
 923                         // If dirt, grow grass on it.
 924                         if (y > water_level - 10 &&
 925                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 926                                 vm->m_area.add_y(em, i, -1);
 927                                 if (vm->m_data[i].getContent() == c_dirt)
 928                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 929                         }
 930                 }
 931         }
 932 }
 933 #endif