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