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 "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 "mg_biome.h"
  37 #include "mg_ore.h"
  38 #include "mg_decoration.h"
  39 #include "mapgen_fractal.h"
  40
  41
  42 FlagDesc flagdesc_mapgen_fractal[] = {
  43         {"terrain", MGFRACTAL_TERRAIN},
  44         {NULL,      0}
  45 };
  46
  47 ///////////////////////////////////////////////////////////////////////////////////////
  48
  49
  50 MapgenFractal::MapgenFractal(MapgenFractalParams *params, EmergeManager *emerge)
  51         : MapgenBasic(MAPGEN_FRACTAL, params, emerge)
  52 {
  53         spflags            = params->spflags;
  54         cave_width         = params->cave_width;
  55         large_cave_depth   = params->large_cave_depth;
  56         small_cave_num_min = params->small_cave_num_min;
  57         small_cave_num_max = params->small_cave_num_max;
  58         large_cave_num_min = params->large_cave_num_min;
  59         large_cave_num_max = params->large_cave_num_max;
  60         large_cave_flooded = params->large_cave_flooded;
  61         dungeon_ymin       = params->dungeon_ymin;
  62         dungeon_ymax       = params->dungeon_ymax;
  63         fractal            = params->fractal;
  64         iterations         = params->iterations;
  65         scale              = params->scale;
  66         offset             = params->offset;
  67         slice_w            = params->slice_w;
  68         julia_x            = params->julia_x;
  69         julia_y            = params->julia_y;
  70         julia_z            = params->julia_z;
  71         julia_w            = params->julia_w;
  72
  73         //// 2D noise
  74         if (spflags & MGFRACTAL_TERRAIN)
  75                 noise_seabed = new Noise(&params->np_seabed, seed, csize.X, csize.Z);
  76
  77         noise_filler_depth = new Noise(&params->np_filler_depth, seed, csize.X, csize.Z);
  78
  79         //// 3D noise
  80         MapgenBasic::np_dungeons = params->np_dungeons;
  81         // Overgeneration to node_min.Y - 1
  82         MapgenBasic::np_cave1    = params->np_cave1;
  83         MapgenBasic::np_cave2    = params->np_cave2;
  84
  85         formula = fractal / 2 + fractal % 2;
  86         julia   = fractal % 2 == 0;
  87 }
  88
  89
  90 MapgenFractal::~MapgenFractal()
  91 {
  92         delete noise_seabed;
  93         delete noise_filler_depth;
  94 }
  95
  96
  97 MapgenFractalParams::MapgenFractalParams():
  98         np_seabed       (-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0),
  99         np_filler_depth (0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0),
 100         np_cave1        (0,   12,  v3f(61,  61,  61),  52534, 3, 0.5, 2.0),
 101         np_cave2        (0,   12,  v3f(67,  67,  67),  10325, 3, 0.5, 2.0),
 102         np_dungeons     (0.9, 0.5, v3f(500, 500, 500), 0,     2, 0.8, 2.0)
 103 {
 104 }
 105
 106
 107 void MapgenFractalParams::readParams(const Settings *settings)
 108 {
 109         settings->getFlagStrNoEx("mgfractal_spflags", spflags, flagdesc_mapgen_fractal);
 110         settings->getFloatNoEx("mgfractal_cave_width",         cave_width);
 111         settings->getS16NoEx("mgfractal_large_cave_depth",     large_cave_depth);
 112         settings->getU16NoEx("mgfractal_small_cave_num_min",   small_cave_num_min);
 113         settings->getU16NoEx("mgfractal_small_cave_num_max",   small_cave_num_max);
 114         settings->getU16NoEx("mgfractal_large_cave_num_min",   large_cave_num_min);
 115         settings->getU16NoEx("mgfractal_large_cave_num_max",   large_cave_num_max);
 116         settings->getFloatNoEx("mgfractal_large_cave_flooded", large_cave_flooded);
 117         settings->getS16NoEx("mgfractal_dungeon_ymin",         dungeon_ymin);
 118         settings->getS16NoEx("mgfractal_dungeon_ymax",         dungeon_ymax);
 119         settings->getU16NoEx("mgfractal_fractal",              fractal);
 120         settings->getU16NoEx("mgfractal_iterations",           iterations);
 121         settings->getV3FNoEx("mgfractal_scale",                scale);
 122         settings->getV3FNoEx("mgfractal_offset",               offset);
 123         settings->getFloatNoEx("mgfractal_slice_w",            slice_w);
 124         settings->getFloatNoEx("mgfractal_julia_x",            julia_x);
 125         settings->getFloatNoEx("mgfractal_julia_y",            julia_y);
 126         settings->getFloatNoEx("mgfractal_julia_z",            julia_z);
 127         settings->getFloatNoEx("mgfractal_julia_w",            julia_w);
 128
 129         settings->getNoiseParams("mgfractal_np_seabed",       np_seabed);
 130         settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 131         settings->getNoiseParams("mgfractal_np_cave1",        np_cave1);
 132         settings->getNoiseParams("mgfractal_np_cave2",        np_cave2);
 133         settings->getNoiseParams("mgfractal_np_dungeons",     np_dungeons);
 134 }
 135
 136
 137 void MapgenFractalParams::writeParams(Settings *settings) const
 138 {
 139         settings->setFlagStr("mgfractal_spflags", spflags, flagdesc_mapgen_fractal);
 140         settings->setFloat("mgfractal_cave_width",         cave_width);
 141         settings->setS16("mgfractal_large_cave_depth",     large_cave_depth);
 142         settings->setU16("mgfractal_small_cave_num_min",   small_cave_num_min);
 143         settings->setU16("mgfractal_small_cave_num_max",   small_cave_num_max);
 144         settings->setU16("mgfractal_large_cave_num_min",   large_cave_num_min);
 145         settings->setU16("mgfractal_large_cave_num_max",   large_cave_num_max);
 146         settings->setFloat("mgfractal_large_cave_flooded", large_cave_flooded);
 147         settings->setS16("mgfractal_dungeon_ymin",         dungeon_ymin);
 148         settings->setS16("mgfractal_dungeon_ymax",         dungeon_ymax);
 149         settings->setU16("mgfractal_fractal",              fractal);
 150         settings->setU16("mgfractal_iterations",           iterations);
 151         settings->setV3F("mgfractal_scale",                scale);
 152         settings->setV3F("mgfractal_offset",               offset);
 153         settings->setFloat("mgfractal_slice_w",            slice_w);
 154         settings->setFloat("mgfractal_julia_x",            julia_x);
 155         settings->setFloat("mgfractal_julia_y",            julia_y);
 156         settings->setFloat("mgfractal_julia_z",            julia_z);
 157         settings->setFloat("mgfractal_julia_w",            julia_w);
 158
 159         settings->setNoiseParams("mgfractal_np_seabed",       np_seabed);
 160         settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 161         settings->setNoiseParams("mgfractal_np_cave1",        np_cave1);
 162         settings->setNoiseParams("mgfractal_np_cave2",        np_cave2);
 163         settings->setNoiseParams("mgfractal_np_dungeons",     np_dungeons);
 164 }
 165
 166
 167 void MapgenFractalParams::setDefaultSettings(Settings *settings)
 168 {
 169         settings->setDefault("mgfractal_spflags", flagdesc_mapgen_fractal,
 170                 MGFRACTAL_TERRAIN);
 171 }
 172
 173
 174 /////////////////////////////////////////////////////////////////
 175
 176
 177 int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 178 {
 179         bool solid_below = false; // Fractal node is present below to spawn on
 180         u8 air_count = 0; // Consecutive air nodes above a fractal node
 181         s16 search_start = 0; // No terrain search start
 182
 183         // If terrain present, don't start search below terrain or water level
 184         if (noise_seabed) {
 185                 s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
 186                 search_start = MYMAX(search_start, MYMAX(seabed_level, water_level));
 187         }
 188
 189         for (s16 y = search_start; y <= search_start + 4096; y++) {
 190                 if (getFractalAtPoint(p.X, y, p.Y)) {
 191                         // Fractal node
 192                         solid_below = true;
 193                         air_count = 0;
 194                 } else if (solid_below) {
 195                         // Air above fractal node
 196                         air_count++;
 197                         // 3 and -2 to account for biome dust nodes
 198                         if (air_count == 3)
 199                                 return y - 2;
 200                 }
 201         }
 202
 203         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 204 }
 205
 206
 207 void MapgenFractal::makeChunk(BlockMakeData *data)
 208 {
 209         // Pre-conditions
 210         assert(data->vmanip);
 211         assert(data->nodedef);
 212         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 213                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 214                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 215         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 216                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 217                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 218
 219         //TimeTaker t("makeChunk");
 220
 221         this->generating = true;
 222         this->vm = data->vmanip;
 223         this->ndef = data->nodedef;
 224
 225         v3s16 blockpos_min = data->blockpos_min;
 226         v3s16 blockpos_max = data->blockpos_max;
 227         node_min = blockpos_min * MAP_BLOCKSIZE;
 228         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 229         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 230         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 231
 232         blockseed = getBlockSeed2(full_node_min, seed);
 233
 234         // Generate fractal and optional terrain
 235         s16 stone_surface_max_y = generateTerrain();
 236
 237         // Create heightmap
 238         updateHeightmap(node_min, node_max);
 239
 240         // Init biome generator, place biome-specific nodes, and build biomemap
 241         if (flags & MG_BIOMES) {
 242                 biomegen->calcBiomeNoise(node_min);
 243                 generateBiomes();
 244         }
 245
 246         // Generate tunnels and randomwalk caves
 247         if (flags & MG_CAVES) {
 248                 generateCavesNoiseIntersection(stone_surface_max_y);
 249                 generateCavesRandomWalk(stone_surface_max_y, large_cave_depth);
 250         }
 251
 252         // Generate the registered ores
 253         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 254
 255         // Generate dungeons
 256         if (flags & MG_DUNGEONS)
 257                 generateDungeons(stone_surface_max_y);
 258
 259         // Generate the registered decorations
 260         if (flags & MG_DECORATIONS)
 261                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 262
 263         // Sprinkle some dust on top after everything else was generated
 264         if (flags & MG_BIOMES)
 265                 dustTopNodes();
 266
 267         // Update liquids
 268         if (spflags & MGFRACTAL_TERRAIN)
 269                 updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 270
 271         // Calculate lighting
 272         if (flags & MG_LIGHT)
 273                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 274                         full_node_min, full_node_max);
 275
 276         this->generating = false;
 277
 278         //printf("makeChunk: %lums\n", t.stop());
 279 }
 280
 281
 282 bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
 283 {
 284         float cx, cy, cz, cw, ox, oy, oz, ow;
 285
 286         if (julia) {  // Julia set
 287                 cx = julia_x;
 288                 cy = julia_y;
 289                 cz = julia_z;
 290                 cw = julia_w;
 291                 ox = (float)x / scale.X - offset.X;
 292                 oy = (float)y / scale.Y - offset.Y;
 293                 oz = (float)z / scale.Z - offset.Z;
 294                 ow = slice_w;
 295         } else {  // Mandelbrot set
 296                 cx = (float)x / scale.X - offset.X;
 297                 cy = (float)y / scale.Y - offset.Y;
 298                 cz = (float)z / scale.Z - offset.Z;
 299                 cw = slice_w;
 300                 ox = 0.0f;
 301                 oy = 0.0f;
 302                 oz = 0.0f;
 303                 ow = 0.0f;
 304         }
 305
 306         float nx = 0.0f;
 307         float ny = 0.0f;
 308         float nz = 0.0f;
 309         float nw = 0.0f;
 310
 311         for (u16 iter = 0; iter < iterations; iter++) {
 312                 switch (formula) {
 313                 default:
 314                 case 1: // 4D "Roundy"
 315                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 316                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 317                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 318                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 319                         break;
 320                 case 2: // 4D "Squarry"
 321                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 322                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 323                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 324                         nw = 2.0f * (ox * ow - oy * oz) + cw;
 325                         break;
 326                 case 3: // 4D "Mandy Cousin"
 327                         nx = ox * ox - oy * oy - oz * oz + ow * ow + cx;
 328                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 329                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 330                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 331                         break;
 332                 case 4: // 4D "Variation"
 333                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 334                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 335                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 336                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 337                         break;
 338                 case 5: // 3D "Mandelbrot/Mandelbar"
 339                         nx = ox * ox - oy * oy - oz * oz + cx;
 340                         ny = 2.0f * ox * oy + cy;
 341                         nz = -2.0f * ox * oz + cz;
 342                         break;
 343                 case 6: // 3D "Christmas Tree"
 344                         // Altering the formula here is necessary to avoid division by zero
 345                         if (std::fabs(oz) < 0.000000001f) {
 346                                 nx = ox * ox - oy * oy - oz * oz + cx;
 347                                 ny = 2.0f * oy * ox + cy;
 348                                 nz = 4.0f * oz * ox + cz;
 349                         } else {
 350                                 float a = (2.0f * ox) / (std::sqrt(oy * oy + oz * oz));
 351                                 nx = ox * ox - oy * oy - oz * oz + cx;
 352                                 ny = a * (oy * oy - oz * oz) + cy;
 353                                 nz = a * 2.0f * oy * oz + cz;
 354                         }
 355                         break;
 356                 case 7: // 3D "Mandelbulb"
 357                         if (std::fabs(oy) < 0.000000001f) {
 358                                 nx = ox * ox - oz * oz + cx;
 359                                 ny = cy;
 360                                 nz = -2.0f * oz * std::sqrt(ox * ox) + cz;
 361                         } else {
 362                                 float a = 1.0f - (oz * oz) / (ox * ox + oy * oy);
 363                                 nx = (ox * ox - oy * oy) * a + cx;
 364                                 ny = 2.0f * ox * oy * a + cy;
 365                                 nz = -2.0f * oz * std::sqrt(ox * ox + oy * oy) + cz;
 366                         }
 367                         break;
 368                 case 8: // 3D "Cosine Mandelbulb"
 369                         if (std::fabs(oy) < 0.000000001f) {
 370                                 nx = 2.0f * ox * oz + cx;
 371                                 ny = 4.0f * oy * oz + cy;
 372                                 nz = oz * oz - ox * ox - oy * oy + cz;
 373                         } else {
 374                                 float a = (2.0f * oz) / std::sqrt(ox * ox + oy * oy);
 375                                 nx = (ox * ox - oy * oy) * a + cx;
 376                                 ny = 2.0f * ox * oy * a + cy;
 377                                 nz = oz * oz - ox * ox - oy * oy + cz;
 378                         }
 379                         break;
 380                 case 9: // 4D "Mandelbulb"
 381                         float rxy = std::sqrt(ox * ox + oy * oy);
 382                         float rxyz = std::sqrt(ox * ox + oy * oy + oz * oz);
 383                         if (std::fabs(ow) < 0.000000001f && std::fabs(oz) < 0.000000001f) {
 384                                 nx = (ox * ox - oy * oy) + cx;
 385                                 ny = 2.0f * ox * oy + cy;
 386                                 nz = -2.0f * rxy * oz + cz;
 387                                 nw = 2.0f * rxyz * ow + cw;
 388                         } else {
 389                                 float a = 1.0f - (ow * ow) / (rxyz * rxyz);
 390                                 float b = a * (1.0f - (oz * oz) / (rxy * rxy));
 391                                 nx = (ox * ox - oy * oy) * b + cx;
 392                                 ny = 2.0f * ox * oy * b + cy;
 393                                 nz = -2.0f * rxy * oz * a + cz;
 394                                 nw = 2.0f * rxyz * ow + cw;
 395                         }
 396                         break;
 397                 }
 398
 399                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 400                         return false;
 401
 402                 ox = nx;
 403                 oy = ny;
 404                 oz = nz;
 405                 ow = nw;
 406         }
 407
 408         return true;
 409 }
 410
 411
 412 s16 MapgenFractal::generateTerrain()
 413 {
 414         MapNode n_air(CONTENT_AIR);
 415         MapNode n_stone(c_stone);
 416         MapNode n_water(c_water_source);
 417
 418         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 419         u32 index2d = 0;
 420
 421         if (noise_seabed)
 422                 noise_seabed->perlinMap2D(node_min.X, node_min.Z);
 423
 424         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 425                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 426                         u32 vi = vm->m_area.index(node_min.X, y, z);
 427                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 428                                 if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
 429                                         continue;
 430
 431                                 s16 seabed_height = -MAX_MAP_GENERATION_LIMIT;
 432                                 if (noise_seabed)
 433                                         seabed_height = noise_seabed->result[index2d];
 434
 435                                 if (((spflags & MGFRACTAL_TERRAIN) && y <= seabed_height) ||
 436                                                 getFractalAtPoint(x, y, z)) {
 437                                         vm->m_data[vi] = n_stone;
 438                                         if (y > stone_surface_max_y)
 439                                                 stone_surface_max_y = y;
 440                                 } else if ((spflags & MGFRACTAL_TERRAIN) && y <= water_level) {
 441                                         vm->m_data[vi] = n_water;
 442                                 } else {
 443                                         vm->m_data[vi] = n_air;
 444                                 }
 445                         }
 446                         index2d -= ystride;
 447                 }
 448                 index2d += ystride;
 449         }
 450
 451         return stone_surface_max_y;
 452 }