src/mapgen/mapgen_fractal.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2015-2019 paramat
   4 Copyright (C) 2015-2016 kwolekr, Ryan Kwolek
   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 <cmath>
  24 #include "voxel.h"
  25 #include "noise.h"
  26 #include "mapblock.h"
  27 #include "mapnode.h"
  28 #include "map.h"
  29 #include "content_sao.h"
  30 #include "nodedef.h"
  31 #include "voxelalgorithms.h"
  32 //#include "profiler.h" // For TimeTaker
  33 #include "settings.h" // For g_settings
  34 #include "emerge.h"
  35 #include "dungeongen.h"
  36 #include "cavegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_fractal.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_fractal[] = {
  44         {"terrain", MGFRACTAL_TERRAIN},
  45         {NULL,      0}
  46 };
  47
  48 ///////////////////////////////////////////////////////////////////////////////////////
  49
  50
  51 MapgenFractal::MapgenFractal(MapgenFractalParams *params, EmergeManager *emerge)
  52         : MapgenBasic(MAPGEN_FRACTAL, params, emerge)
  53 {
  54         spflags            = params->spflags;
  55         cave_width         = params->cave_width;
  56         large_cave_depth   = params->large_cave_depth;
  57         small_cave_num_min = params->small_cave_num_min;
  58         small_cave_num_max = params->small_cave_num_max;
  59         large_cave_num_min = params->large_cave_num_min;
  60         large_cave_num_max = params->large_cave_num_max;
  61         large_cave_flooded = params->large_cave_flooded;
  62         dungeon_ymin       = params->dungeon_ymin;
  63         dungeon_ymax       = params->dungeon_ymax;
  64         fractal            = params->fractal;
  65         iterations         = params->iterations;
  66         scale              = params->scale;
  67         offset             = params->offset;
  68         slice_w            = params->slice_w;
  69         julia_x            = params->julia_x;
  70         julia_y            = params->julia_y;
  71         julia_z            = params->julia_z;
  72         julia_w            = params->julia_w;
  73
  74         //// 2D noise
  75         if (spflags & MGFRACTAL_TERRAIN)
  76                 noise_seabed = new Noise(&params->np_seabed, seed, csize.X, csize.Z);
  77
  78         noise_filler_depth = new Noise(&params->np_filler_depth, seed, csize.X, csize.Z);
  79
  80         //// 3D noise
  81         MapgenBasic::np_dungeons = params->np_dungeons;
  82         // Overgeneration to node_min.Y - 1
  83         MapgenBasic::np_cave1    = params->np_cave1;
  84         MapgenBasic::np_cave2    = params->np_cave2;
  85
  86         formula = fractal / 2 + fractal % 2;
  87         julia   = fractal % 2 == 0;
  88 }
  89
  90
  91 MapgenFractal::~MapgenFractal()
  92 {
  93         if (noise_seabed)
  94                 delete noise_seabed;
  95
  96         delete noise_filler_depth;
  97 }
  98
  99
 100 MapgenFractalParams::MapgenFractalParams():
 101         np_seabed       (-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0),
 102         np_filler_depth (0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0),
 103         np_cave1        (0,   12,  v3f(61,  61,  61),  52534, 3, 0.5, 2.0),
 104         np_cave2        (0,   12,  v3f(67,  67,  67),  10325, 3, 0.5, 2.0),
 105         np_dungeons     (0.9, 0.5, v3f(500, 500, 500), 0,     2, 0.8, 2.0)
 106 {
 107 }
 108
 109
 110 void MapgenFractalParams::readParams(const Settings *settings)
 111 {
 112         settings->getFlagStrNoEx("mgfractal_spflags", spflags, flagdesc_mapgen_fractal);
 113         settings->getFloatNoEx("mgfractal_cave_width",         cave_width);
 114         settings->getS16NoEx("mgfractal_large_cave_depth",     large_cave_depth);
 115         settings->getU16NoEx("mgfractal_small_cave_num_min",   small_cave_num_min);
 116         settings->getU16NoEx("mgfractal_small_cave_num_max",   small_cave_num_max);
 117         settings->getU16NoEx("mgfractal_large_cave_num_min",   large_cave_num_min);
 118         settings->getU16NoEx("mgfractal_large_cave_num_max",   large_cave_num_max);
 119         settings->getFloatNoEx("mgfractal_large_cave_flooded", large_cave_flooded);
 120         settings->getS16NoEx("mgfractal_dungeon_ymin",         dungeon_ymin);
 121         settings->getS16NoEx("mgfractal_dungeon_ymax",         dungeon_ymax);
 122         settings->getU16NoEx("mgfractal_fractal",              fractal);
 123         settings->getU16NoEx("mgfractal_iterations",           iterations);
 124         settings->getV3FNoEx("mgfractal_scale",                scale);
 125         settings->getV3FNoEx("mgfractal_offset",               offset);
 126         settings->getFloatNoEx("mgfractal_slice_w",            slice_w);
 127         settings->getFloatNoEx("mgfractal_julia_x",            julia_x);
 128         settings->getFloatNoEx("mgfractal_julia_y",            julia_y);
 129         settings->getFloatNoEx("mgfractal_julia_z",            julia_z);
 130         settings->getFloatNoEx("mgfractal_julia_w",            julia_w);
 131
 132         settings->getNoiseParams("mgfractal_np_seabed",       np_seabed);
 133         settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 134         settings->getNoiseParams("mgfractal_np_cave1",        np_cave1);
 135         settings->getNoiseParams("mgfractal_np_cave2",        np_cave2);
 136         settings->getNoiseParams("mgfractal_np_dungeons",     np_dungeons);
 137 }
 138
 139
 140 void MapgenFractalParams::writeParams(Settings *settings) const
 141 {
 142         settings->setFlagStr("mgfractal_spflags", spflags, flagdesc_mapgen_fractal, U32_MAX);
 143         settings->setFloat("mgfractal_cave_width",         cave_width);
 144         settings->setS16("mgfractal_large_cave_depth",     large_cave_depth);
 145         settings->setU16("mgfractal_small_cave_num_min",   small_cave_num_min);
 146         settings->setU16("mgfractal_small_cave_num_max",   small_cave_num_max);
 147         settings->setU16("mgfractal_large_cave_num_min",   large_cave_num_min);
 148         settings->setU16("mgfractal_large_cave_num_max",   large_cave_num_max);
 149         settings->setFloat("mgfractal_large_cave_flooded", large_cave_flooded);
 150         settings->setS16("mgfractal_dungeon_ymin",         dungeon_ymin);
 151         settings->setS16("mgfractal_dungeon_ymax",         dungeon_ymax);
 152         settings->setU16("mgfractal_fractal",              fractal);
 153         settings->setU16("mgfractal_iterations",           iterations);
 154         settings->setV3F("mgfractal_scale",                scale);
 155         settings->setV3F("mgfractal_offset",               offset);
 156         settings->setFloat("mgfractal_slice_w",            slice_w);
 157         settings->setFloat("mgfractal_julia_x",            julia_x);
 158         settings->setFloat("mgfractal_julia_y",            julia_y);
 159         settings->setFloat("mgfractal_julia_z",            julia_z);
 160         settings->setFloat("mgfractal_julia_w",            julia_w);
 161
 162         settings->setNoiseParams("mgfractal_np_seabed",       np_seabed);
 163         settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 164         settings->setNoiseParams("mgfractal_np_cave1",        np_cave1);
 165         settings->setNoiseParams("mgfractal_np_cave2",        np_cave2);
 166         settings->setNoiseParams("mgfractal_np_dungeons",     np_dungeons);
 167 }
 168
 169
 170 /////////////////////////////////////////////////////////////////
 171
 172
 173 int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 174 {
 175         bool solid_below = false; // Fractal node is present below to spawn on
 176         u8 air_count = 0; // Consecutive air nodes above a fractal node
 177         s16 search_start = 0; // No terrain search start
 178
 179         // If terrain present, don't start search below terrain or water level
 180         if (noise_seabed) {
 181                 s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
 182                 search_start = MYMAX(search_start, MYMAX(seabed_level, water_level));
 183         }
 184
 185         for (s16 y = search_start; y <= search_start + 4096; y++) {
 186                 if (getFractalAtPoint(p.X, y, p.Y)) {
 187                         // Fractal node
 188                         solid_below = true;
 189                         air_count = 0;
 190                 } else if (solid_below) {
 191                         // Air above fractal node
 192                         air_count++;
 193                         // 3 and -2 to account for biome dust nodes
 194                         if (air_count == 3)
 195                                 return y - 2;
 196                 }
 197         }
 198
 199         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 200 }
 201
 202
 203 void MapgenFractal::makeChunk(BlockMakeData *data)
 204 {
 205         // Pre-conditions
 206         assert(data->vmanip);
 207         assert(data->nodedef);
 208         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 209                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 210                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 211         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 212                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 213                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 214
 215         //TimeTaker t("makeChunk");
 216
 217         this->generating = true;
 218         this->vm = data->vmanip;
 219         this->ndef = data->nodedef;
 220
 221         v3s16 blockpos_min = data->blockpos_min;
 222         v3s16 blockpos_max = data->blockpos_max;
 223         node_min = blockpos_min * MAP_BLOCKSIZE;
 224         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 225         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 226         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 227
 228         blockseed = getBlockSeed2(full_node_min, seed);
 229
 230         // Generate fractal and optional terrain
 231         s16 stone_surface_max_y = generateTerrain();
 232
 233         // Create heightmap
 234         updateHeightmap(node_min, node_max);
 235
 236         // Init biome generator, place biome-specific nodes, and build biomemap
 237         if (flags & MG_BIOMES) {
 238                 biomegen->calcBiomeNoise(node_min);
 239                 generateBiomes();
 240         }
 241
 242         // Generate tunnels and randomwalk caves
 243         if (flags & MG_CAVES) {
 244                 generateCavesNoiseIntersection(stone_surface_max_y);
 245                 generateCavesRandomWalk(stone_surface_max_y, large_cave_depth);
 246         }
 247
 248         // Generate the registered ores
 249         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 250
 251         // Generate dungeons
 252         if ((flags & MG_DUNGEONS) && full_node_min.Y >= dungeon_ymin &&
 253                         full_node_max.Y <= dungeon_ymax)
 254                 generateDungeons(stone_surface_max_y);
 255
 256         // Generate the registered decorations
 257         if (flags & MG_DECORATIONS)
 258                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 259
 260         // Sprinkle some dust on top after everything else was generated
 261         if (flags & MG_BIOMES)
 262                 dustTopNodes();
 263
 264         // Update liquids
 265         if (spflags & MGFRACTAL_TERRAIN)
 266                 updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 267
 268         // Calculate lighting
 269         if (flags & MG_LIGHT)
 270                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 271                         full_node_min, full_node_max);
 272
 273         this->generating = false;
 274
 275         //printf("makeChunk: %lums\n", t.stop());
 276 }
 277
 278
 279 bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
 280 {
 281         float cx, cy, cz, cw, ox, oy, oz, ow;
 282
 283         if (julia) {  // Julia set
 284                 cx = julia_x;
 285                 cy = julia_y;
 286                 cz = julia_z;
 287                 cw = julia_w;
 288                 ox = (float)x / scale.X - offset.X;
 289                 oy = (float)y / scale.Y - offset.Y;
 290                 oz = (float)z / scale.Z - offset.Z;
 291                 ow = slice_w;
 292         } else {  // Mandelbrot set
 293                 cx = (float)x / scale.X - offset.X;
 294                 cy = (float)y / scale.Y - offset.Y;
 295                 cz = (float)z / scale.Z - offset.Z;
 296                 cw = slice_w;
 297                 ox = 0.0f;
 298                 oy = 0.0f;
 299                 oz = 0.0f;
 300                 ow = 0.0f;
 301         }
 302
 303         float nx = 0.0f;
 304         float ny = 0.0f;
 305         float nz = 0.0f;
 306         float nw = 0.0f;
 307
 308         for (u16 iter = 0; iter < iterations; iter++) {
 309                 switch (formula) {
 310                 default:
 311                 case 1: // 4D "Roundy"
 312                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 313                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 314                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 315                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 316                         break;
 317                 case 2: // 4D "Squarry"
 318                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 319                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 320                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 321                         nw = 2.0f * (ox * ow - oy * oz) + cw;
 322                         break;
 323                 case 3: // 4D "Mandy Cousin"
 324                         nx = ox * ox - oy * oy - oz * oz + ow * ow + cx;
 325                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 326                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 327                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 328                         break;
 329                 case 4: // 4D "Variation"
 330                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 331                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 332                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 333                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 334                         break;
 335                 case 5: // 3D "Mandelbrot/Mandelbar"
 336                         nx = ox * ox - oy * oy - oz * oz + cx;
 337                         ny = 2.0f * ox * oy + cy;
 338                         nz = -2.0f * ox * oz + cz;
 339                         break;
 340                 case 6: // 3D "Christmas Tree"
 341                         // Altering the formula here is necessary to avoid division by zero
 342                         if (std::fabs(oz) < 0.000000001f) {
 343                                 nx = ox * ox - oy * oy - oz * oz + cx;
 344                                 ny = 2.0f * oy * ox + cy;
 345                                 nz = 4.0f * oz * ox + cz;
 346                         } else {
 347                                 float a = (2.0f * ox) / (std::sqrt(oy * oy + oz * oz));
 348                                 nx = ox * ox - oy * oy - oz * oz + cx;
 349                                 ny = a * (oy * oy - oz * oz) + cy;
 350                                 nz = a * 2.0f * oy * oz + cz;
 351                         }
 352                         break;
 353                 case 7: // 3D "Mandelbulb"
 354                         if (std::fabs(oy) < 0.000000001f) {
 355                                 nx = ox * ox - oz * oz + cx;
 356                                 ny = cy;
 357                                 nz = -2.0f * oz * std::sqrt(ox * ox) + cz;
 358                         } else {
 359                                 float a = 1.0f - (oz * oz) / (ox * ox + oy * oy);
 360                                 nx = (ox * ox - oy * oy) * a + cx;
 361                                 ny = 2.0f * ox * oy * a + cy;
 362                                 nz = -2.0f * oz * std::sqrt(ox * ox + oy * oy) + cz;
 363                         }
 364                         break;
 365                 case 8: // 3D "Cosine Mandelbulb"
 366                         if (std::fabs(oy) < 0.000000001f) {
 367                                 nx = 2.0f * ox * oz + cx;
 368                                 ny = 4.0f * oy * oz + cy;
 369                                 nz = oz * oz - ox * ox - oy * oy + cz;
 370                         } else {
 371                                 float a = (2.0f * oz) / std::sqrt(ox * ox + oy * oy);
 372                                 nx = (ox * ox - oy * oy) * a + cx;
 373                                 ny = 2.0f * ox * oy * a + cy;
 374                                 nz = oz * oz - ox * ox - oy * oy + cz;
 375                         }
 376                         break;
 377                 case 9: // 4D "Mandelbulb"
 378                         float rxy = std::sqrt(ox * ox + oy * oy);
 379                         float rxyz = std::sqrt(ox * ox + oy * oy + oz * oz);
 380                         if (std::fabs(ow) < 0.000000001f && std::fabs(oz) < 0.000000001f) {
 381                                 nx = (ox * ox - oy * oy) + cx;
 382                                 ny = 2.0f * ox * oy + cy;
 383                                 nz = -2.0f * rxy * oz + cz;
 384                                 nw = 2.0f * rxyz * ow + cw;
 385                         } else {
 386                                 float a = 1.0f - (ow * ow) / (rxyz * rxyz);
 387                                 float b = a * (1.0f - (oz * oz) / (rxy * rxy));
 388                                 nx = (ox * ox - oy * oy) * b + cx;
 389                                 ny = 2.0f * ox * oy * b + cy;
 390                                 nz = -2.0f * rxy * oz * a + cz;
 391                                 nw = 2.0f * rxyz * ow + cw;
 392                         }
 393                         break;
 394                 }
 395
 396                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 397                         return false;
 398
 399                 ox = nx;
 400                 oy = ny;
 401                 oz = nz;
 402                 ow = nw;
 403         }
 404
 405         return true;
 406 }
 407
 408
 409 s16 MapgenFractal::generateTerrain()
 410 {
 411         MapNode n_air(CONTENT_AIR);
 412         MapNode n_stone(c_stone);
 413         MapNode n_water(c_water_source);
 414
 415         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 416         u32 index2d = 0;
 417
 418         if (noise_seabed)
 419                 noise_seabed->perlinMap2D(node_min.X, node_min.Z);
 420
 421         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 422                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 423                         u32 vi = vm->m_area.index(node_min.X, y, z);
 424                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 425                                 if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
 426                                         continue;
 427
 428                                 s16 seabed_height = -MAX_MAP_GENERATION_LIMIT;
 429                                 if (noise_seabed)
 430                                         seabed_height = noise_seabed->result[index2d];
 431
 432                                 if (((spflags & MGFRACTAL_TERRAIN) && y <= seabed_height) ||
 433                                                 getFractalAtPoint(x, y, z)) {
 434                                         vm->m_data[vi] = n_stone;
 435                                         if (y > stone_surface_max_y)
 436                                                 stone_surface_max_y = y;
 437                                 } else if ((spflags & MGFRACTAL_TERRAIN) && y <= water_level) {
 438                                         vm->m_data[vi] = n_water;
 439                                 } else {
 440                                         vm->m_data[vi] = n_air;
 441                                 }
 442                         }
 443                         index2d -= ystride;
 444                 }
 445                 index2d += ystride;
 446         }
 447
 448         return stone_surface_max_y;
 449 }