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);
 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 void MapgenFractalParams::setDefaultSettings(Settings *settings)
 171 {
 172         settings->setDefault("mgfractal_spflags", flagdesc_mapgen_fractal,
 173                 MGFRACTAL_TERRAIN);
 174 }
 175
 176
 177 /////////////////////////////////////////////////////////////////
 178
 179
 180 int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 181 {
 182         bool solid_below = false; // Fractal node is present below to spawn on
 183         u8 air_count = 0; // Consecutive air nodes above a fractal node
 184         s16 search_start = 0; // No terrain search start
 185
 186         // If terrain present, don't start search below terrain or water level
 187         if (noise_seabed) {
 188                 s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
 189                 search_start = MYMAX(search_start, MYMAX(seabed_level, water_level));
 190         }
 191
 192         for (s16 y = search_start; y <= search_start + 4096; y++) {
 193                 if (getFractalAtPoint(p.X, y, p.Y)) {
 194                         // Fractal node
 195                         solid_below = true;
 196                         air_count = 0;
 197                 } else if (solid_below) {
 198                         // Air above fractal node
 199                         air_count++;
 200                         // 3 and -2 to account for biome dust nodes
 201                         if (air_count == 3)
 202                                 return y - 2;
 203                 }
 204         }
 205
 206         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 207 }
 208
 209
 210 void MapgenFractal::makeChunk(BlockMakeData *data)
 211 {
 212         // Pre-conditions
 213         assert(data->vmanip);
 214         assert(data->nodedef);
 215         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 216                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 217                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 218         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 219                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 220                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 221
 222         //TimeTaker t("makeChunk");
 223
 224         this->generating = true;
 225         this->vm = data->vmanip;
 226         this->ndef = data->nodedef;
 227
 228         v3s16 blockpos_min = data->blockpos_min;
 229         v3s16 blockpos_max = data->blockpos_max;
 230         node_min = blockpos_min * MAP_BLOCKSIZE;
 231         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 232         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 233         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 234
 235         blockseed = getBlockSeed2(full_node_min, seed);
 236
 237         // Generate fractal and optional terrain
 238         s16 stone_surface_max_y = generateTerrain();
 239
 240         // Create heightmap
 241         updateHeightmap(node_min, node_max);
 242
 243         // Init biome generator, place biome-specific nodes, and build biomemap
 244         if (flags & MG_BIOMES) {
 245                 biomegen->calcBiomeNoise(node_min);
 246                 generateBiomes();
 247         }
 248
 249         // Generate tunnels and randomwalk caves
 250         if (flags & MG_CAVES) {
 251                 generateCavesNoiseIntersection(stone_surface_max_y);
 252                 generateCavesRandomWalk(stone_surface_max_y, large_cave_depth);
 253         }
 254
 255         // Generate the registered ores
 256         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 257
 258         // Generate dungeons
 259         if (flags & MG_DUNGEONS)
 260                 generateDungeons(stone_surface_max_y);
 261
 262         // Generate the registered decorations
 263         if (flags & MG_DECORATIONS)
 264                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 265
 266         // Sprinkle some dust on top after everything else was generated
 267         if (flags & MG_BIOMES)
 268                 dustTopNodes();
 269
 270         // Update liquids
 271         if (spflags & MGFRACTAL_TERRAIN)
 272                 updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 273
 274         // Calculate lighting
 275         if (flags & MG_LIGHT)
 276                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 277                         full_node_min, full_node_max);
 278
 279         this->generating = false;
 280
 281         //printf("makeChunk: %lums\n", t.stop());
 282 }
 283
 284
 285 bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
 286 {
 287         float cx, cy, cz, cw, ox, oy, oz, ow;
 288
 289         if (julia) {  // Julia set
 290                 cx = julia_x;
 291                 cy = julia_y;
 292                 cz = julia_z;
 293                 cw = julia_w;
 294                 ox = (float)x / scale.X - offset.X;
 295                 oy = (float)y / scale.Y - offset.Y;
 296                 oz = (float)z / scale.Z - offset.Z;
 297                 ow = slice_w;
 298         } else {  // Mandelbrot set
 299                 cx = (float)x / scale.X - offset.X;
 300                 cy = (float)y / scale.Y - offset.Y;
 301                 cz = (float)z / scale.Z - offset.Z;
 302                 cw = slice_w;
 303                 ox = 0.0f;
 304                 oy = 0.0f;
 305                 oz = 0.0f;
 306                 ow = 0.0f;
 307         }
 308
 309         float nx = 0.0f;
 310         float ny = 0.0f;
 311         float nz = 0.0f;
 312         float nw = 0.0f;
 313
 314         for (u16 iter = 0; iter < iterations; iter++) {
 315                 switch (formula) {
 316                 default:
 317                 case 1: // 4D "Roundy"
 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 2: // 4D "Squarry"
 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 3: // 4D "Mandy Cousin"
 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 4: // 4D "Variation"
 336                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 337                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 338                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 339                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 340                         break;
 341                 case 5: // 3D "Mandelbrot/Mandelbar"
 342                         nx = ox * ox - oy * oy - oz * oz + cx;
 343                         ny = 2.0f * ox * oy + cy;
 344                         nz = -2.0f * ox * oz + cz;
 345                         break;
 346                 case 6: // 3D "Christmas Tree"
 347                         // Altering the formula here is necessary to avoid division by zero
 348                         if (std::fabs(oz) < 0.000000001f) {
 349                                 nx = ox * ox - oy * oy - oz * oz + cx;
 350                                 ny = 2.0f * oy * ox + cy;
 351                                 nz = 4.0f * oz * ox + cz;
 352                         } else {
 353                                 float a = (2.0f * ox) / (std::sqrt(oy * oy + oz * oz));
 354                                 nx = ox * ox - oy * oy - oz * oz + cx;
 355                                 ny = a * (oy * oy - oz * oz) + cy;
 356                                 nz = a * 2.0f * oy * oz + cz;
 357                         }
 358                         break;
 359                 case 7: // 3D "Mandelbulb"
 360                         if (std::fabs(oy) < 0.000000001f) {
 361                                 nx = ox * ox - oz * oz + cx;
 362                                 ny = cy;
 363                                 nz = -2.0f * oz * std::sqrt(ox * ox) + cz;
 364                         } else {
 365                                 float a = 1.0f - (oz * oz) / (ox * ox + oy * oy);
 366                                 nx = (ox * ox - oy * oy) * a + cx;
 367                                 ny = 2.0f * ox * oy * a + cy;
 368                                 nz = -2.0f * oz * std::sqrt(ox * ox + oy * oy) + cz;
 369                         }
 370                         break;
 371                 case 8: // 3D "Cosine Mandelbulb"
 372                         if (std::fabs(oy) < 0.000000001f) {
 373                                 nx = 2.0f * ox * oz + cx;
 374                                 ny = 4.0f * oy * oz + cy;
 375                                 nz = oz * oz - ox * ox - oy * oy + cz;
 376                         } else {
 377                                 float a = (2.0f * oz) / std::sqrt(ox * ox + oy * oy);
 378                                 nx = (ox * ox - oy * oy) * a + cx;
 379                                 ny = 2.0f * ox * oy * a + cy;
 380                                 nz = oz * oz - ox * ox - oy * oy + cz;
 381                         }
 382                         break;
 383                 case 9: // 4D "Mandelbulb"
 384                         float rxy = std::sqrt(ox * ox + oy * oy);
 385                         float rxyz = std::sqrt(ox * ox + oy * oy + oz * oz);
 386                         if (std::fabs(ow) < 0.000000001f && std::fabs(oz) < 0.000000001f) {
 387                                 nx = (ox * ox - oy * oy) + cx;
 388                                 ny = 2.0f * ox * oy + cy;
 389                                 nz = -2.0f * rxy * oz + cz;
 390                                 nw = 2.0f * rxyz * ow + cw;
 391                         } else {
 392                                 float a = 1.0f - (ow * ow) / (rxyz * rxyz);
 393                                 float b = a * (1.0f - (oz * oz) / (rxy * rxy));
 394                                 nx = (ox * ox - oy * oy) * b + cx;
 395                                 ny = 2.0f * ox * oy * b + cy;
 396                                 nz = -2.0f * rxy * oz * a + cz;
 397                                 nw = 2.0f * rxyz * ow + cw;
 398                         }
 399                         break;
 400                 }
 401
 402                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 403                         return false;
 404
 405                 ox = nx;
 406                 oy = ny;
 407                 oz = nz;
 408                 ow = nw;
 409         }
 410
 411         return true;
 412 }
 413
 414
 415 s16 MapgenFractal::generateTerrain()
 416 {
 417         MapNode n_air(CONTENT_AIR);
 418         MapNode n_stone(c_stone);
 419         MapNode n_water(c_water_source);
 420
 421         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 422         u32 index2d = 0;
 423
 424         if (noise_seabed)
 425                 noise_seabed->perlinMap2D(node_min.X, node_min.Z);
 426
 427         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 428                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 429                         u32 vi = vm->m_area.index(node_min.X, y, z);
 430                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 431                                 if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
 432                                         continue;
 433
 434                                 s16 seabed_height = -MAX_MAP_GENERATION_LIMIT;
 435                                 if (noise_seabed)
 436                                         seabed_height = noise_seabed->result[index2d];
 437
 438                                 if (((spflags & MGFRACTAL_TERRAIN) && y <= seabed_height) ||
 439                                                 getFractalAtPoint(x, y, z)) {
 440                                         vm->m_data[vi] = n_stone;
 441                                         if (y > stone_surface_max_y)
 442                                                 stone_surface_max_y = y;
 443                                 } else if ((spflags & MGFRACTAL_TERRAIN) && y <= water_level) {
 444                                         vm->m_data[vi] = n_water;
 445                                 } else {
 446                                         vm->m_data[vi] = n_air;
 447                                 }
 448                         }
 449                         index2d -= ystride;
 450                 }
 451                 index2d += ystride;
 452         }
 453
 454         return stone_surface_max_y;
 455 }