src/mapgen/mapgen_fractal.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2015-2018 paramat
   4 Copyright (C) 2015-2018 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   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         {NULL,    0}
  45 };
  46
  47 ///////////////////////////////////////////////////////////////////////////////////////
  48
  49
  50 MapgenFractal::MapgenFractal(int mapgenid, MapgenFractalParams *params, EmergeManager *emerge)
  51         : MapgenBasic(mapgenid, params, emerge)
  52 {
  53         spflags          = params->spflags;
  54         cave_width       = params->cave_width;
  55         large_cave_depth = params->large_cave_depth;
  56         lava_depth       = params->lava_depth;
  57         dungeon_ymin     = params->dungeon_ymin;
  58         dungeon_ymax     = params->dungeon_ymax;
  59         fractal          = params->fractal;
  60         iterations       = params->iterations;
  61         scale            = params->scale;
  62         offset           = params->offset;
  63         slice_w          = params->slice_w;
  64         julia_x          = params->julia_x;
  65         julia_y          = params->julia_y;
  66         julia_z          = params->julia_z;
  67         julia_w          = params->julia_w;
  68
  69         //// 2D terrain noise
  70         noise_seabed       = new Noise(&params->np_seabed, seed, csize.X, csize.Z);
  71         noise_filler_depth = new Noise(&params->np_filler_depth, seed, csize.X, csize.Z);
  72
  73         MapgenBasic::np_cave1 = params->np_cave1;
  74         MapgenBasic::np_cave2 = params->np_cave2;
  75
  76         formula = fractal / 2 + fractal % 2;
  77         julia   = fractal % 2 == 0;
  78 }
  79
  80
  81 MapgenFractal::~MapgenFractal()
  82 {
  83         delete noise_seabed;
  84         delete noise_filler_depth;
  85 }
  86
  87
  88 MapgenFractalParams::MapgenFractalParams():
  89         np_seabed       (-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0),
  90         np_filler_depth (0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0),
  91         np_cave1        (0,   12,  v3f(61,  61,  61),  52534, 3, 0.5, 2.0),
  92         np_cave2        (0,   12,  v3f(67,  67,  67),  10325, 3, 0.5, 2.0)
  93 {
  94 }
  95
  96
  97 void MapgenFractalParams::readParams(const Settings *settings)
  98 {
  99         settings->getFlagStrNoEx("mgfractal_spflags",      spflags, flagdesc_mapgen_fractal);
 100         settings->getFloatNoEx("mgfractal_cave_width",     cave_width);
 101         settings->getS16NoEx("mgfractal_large_cave_depth", large_cave_depth);
 102         settings->getS16NoEx("mgfractal_lava_depth",       lava_depth);
 103         settings->getS16NoEx("mgfractal_dungeon_ymin",     dungeon_ymin);
 104         settings->getS16NoEx("mgfractal_dungeon_ymax",     dungeon_ymax);
 105         settings->getU16NoEx("mgfractal_fractal",          fractal);
 106         settings->getU16NoEx("mgfractal_iterations",       iterations);
 107         settings->getV3FNoEx("mgfractal_scale",            scale);
 108         settings->getV3FNoEx("mgfractal_offset",           offset);
 109         settings->getFloatNoEx("mgfractal_slice_w",        slice_w);
 110         settings->getFloatNoEx("mgfractal_julia_x",        julia_x);
 111         settings->getFloatNoEx("mgfractal_julia_y",        julia_y);
 112         settings->getFloatNoEx("mgfractal_julia_z",        julia_z);
 113         settings->getFloatNoEx("mgfractal_julia_w",        julia_w);
 114
 115         settings->getNoiseParams("mgfractal_np_seabed",       np_seabed);
 116         settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 117         settings->getNoiseParams("mgfractal_np_cave1",        np_cave1);
 118         settings->getNoiseParams("mgfractal_np_cave2",        np_cave2);
 119 }
 120
 121
 122 void MapgenFractalParams::writeParams(Settings *settings) const
 123 {
 124         settings->setFlagStr("mgfractal_spflags",      spflags, flagdesc_mapgen_fractal, U32_MAX);
 125         settings->setFloat("mgfractal_cave_width",     cave_width);
 126         settings->setS16("mgfractal_large_cave_depth", large_cave_depth);
 127         settings->setS16("mgfractal_lava_depth",       lava_depth);
 128         settings->setS16("mgfractal_dungeon_ymin",     dungeon_ymin);
 129         settings->setS16("mgfractal_dungeon_ymax",     dungeon_ymax);
 130         settings->setU16("mgfractal_fractal",          fractal);
 131         settings->setU16("mgfractal_iterations",       iterations);
 132         settings->setV3F("mgfractal_scale",            scale);
 133         settings->setV3F("mgfractal_offset",           offset);
 134         settings->setFloat("mgfractal_slice_w",        slice_w);
 135         settings->setFloat("mgfractal_julia_x",        julia_x);
 136         settings->setFloat("mgfractal_julia_y",        julia_y);
 137         settings->setFloat("mgfractal_julia_z",        julia_z);
 138         settings->setFloat("mgfractal_julia_w",        julia_w);
 139
 140         settings->setNoiseParams("mgfractal_np_seabed",       np_seabed);
 141         settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 142         settings->setNoiseParams("mgfractal_np_cave1",        np_cave1);
 143         settings->setNoiseParams("mgfractal_np_cave2",        np_cave2);
 144 }
 145
 146
 147 /////////////////////////////////////////////////////////////////
 148
 149
 150 int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 151 {
 152         bool solid_below = false;  // Dry solid node is present below to spawn on
 153         u8 air_count = 0;  // Consecutive air nodes above the dry solid node
 154         s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
 155         // Seabed can rise above water_level or might be raised to create dry land
 156         s16 search_start = MYMAX(seabed_level, water_level + 1);
 157         if (seabed_level > water_level)
 158                 solid_below = true;
 159
 160         for (s16 y = search_start; y <= search_start + 128; y++) {
 161                 if (getFractalAtPoint(p.X, y, p.Y)) {  // Fractal node
 162                         solid_below = true;
 163                         air_count = 0;
 164                 } else if (solid_below) {  // Air above solid node
 165                         air_count++;
 166                         // 3 to account for snowblock dust
 167                         if (air_count == 3)
 168                                 return y - 2;
 169                 }
 170         }
 171
 172         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 173 }
 174
 175
 176 void MapgenFractal::makeChunk(BlockMakeData *data)
 177 {
 178         // Pre-conditions
 179         assert(data->vmanip);
 180         assert(data->nodedef);
 181         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 182                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 183                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 184         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 185                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 186                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 187
 188         this->generating = true;
 189         this->vm   = data->vmanip;
 190         this->ndef = data->nodedef;
 191         //TimeTaker t("makeChunk");
 192
 193         v3s16 blockpos_min = data->blockpos_min;
 194         v3s16 blockpos_max = data->blockpos_max;
 195         node_min = blockpos_min * MAP_BLOCKSIZE;
 196         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 197         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 198         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 199
 200         blockseed = getBlockSeed2(full_node_min, seed);
 201
 202         // Generate base terrain, mountains, and ridges with initial heightmaps
 203         s16 stone_surface_max_y = generateTerrain();
 204
 205         // Create heightmap
 206         updateHeightmap(node_min, node_max);
 207
 208         // Init biome generator, place biome-specific nodes, and build biomemap
 209         biomegen->calcBiomeNoise(node_min);
 210         generateBiomes();
 211
 212         if (flags & MG_CAVES)
 213                 generateCaves(stone_surface_max_y, large_cave_depth);
 214
 215         if ((flags & MG_DUNGEONS) && full_node_min.Y >= dungeon_ymin &&
 216                         full_node_max.Y <= dungeon_ymax)
 217                 generateDungeons(stone_surface_max_y);
 218
 219         // Generate the registered decorations
 220         if (flags & MG_DECORATIONS)
 221                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 222
 223         // Generate the registered ores
 224         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 225
 226         // Sprinkle some dust on top after everything else was generated
 227         dustTopNodes();
 228
 229         //printf("makeChunk: %dms\n", t.stop());
 230
 231         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 232
 233         if (flags & MG_LIGHT)
 234                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 235                         full_node_min, full_node_max);
 236
 237         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 238         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 239
 240         this->generating = false;
 241 }
 242
 243
 244 bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
 245 {
 246         float cx, cy, cz, cw, ox, oy, oz, ow;
 247
 248         if (julia) {  // Julia set
 249                 cx = julia_x;
 250                 cy = julia_y;
 251                 cz = julia_z;
 252                 cw = julia_w;
 253                 ox = (float)x / scale.X - offset.X;
 254                 oy = (float)y / scale.Y - offset.Y;
 255                 oz = (float)z / scale.Z - offset.Z;
 256                 ow = slice_w;
 257         } else {  // Mandelbrot set
 258                 cx = (float)x / scale.X - offset.X;
 259                 cy = (float)y / scale.Y - offset.Y;
 260                 cz = (float)z / scale.Z - offset.Z;
 261                 cw = slice_w;
 262                 ox = 0.0f;
 263                 oy = 0.0f;
 264                 oz = 0.0f;
 265                 ow = 0.0f;
 266         }
 267
 268         float nx = 0.0f;
 269         float ny = 0.0f;
 270         float nz = 0.0f;
 271         float nw = 0.0f;
 272
 273         for (u16 iter = 0; iter < iterations; iter++) {
 274                 switch (formula) {
 275                 default:
 276                 case 1: // 4D "Roundy"
 277                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 278                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 279                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 280                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 281                         break;
 282                 case 2: // 4D "Squarry"
 283                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 284                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 285                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 286                         nw = 2.0f * (ox * ow - oy * oz) + cw;
 287                         break;
 288                 case 3: // 4D "Mandy Cousin"
 289                         nx = ox * ox - oy * oy - oz * oz + ow * ow + cx;
 290                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 291                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 292                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 293                         break;
 294                 case 4: // 4D "Variation"
 295                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 296                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 297                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 298                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 299                         break;
 300                 case 5: // 3D "Mandelbrot/Mandelbar"
 301                         nx = ox * ox - oy * oy - oz * oz + cx;
 302                         ny = 2.0f * ox * oy + cy;
 303                         nz = -2.0f * ox * oz + cz;
 304                         break;
 305                 case 6: // 3D "Christmas Tree"
 306                         // Altering the formula here is necessary to avoid division by zero
 307                         if (std::fabs(oz) < 0.000000001f) {
 308                                 nx = ox * ox - oy * oy - oz * oz + cx;
 309                                 ny = 2.0f * oy * ox + cy;
 310                                 nz = 4.0f * oz * ox + cz;
 311                         } else {
 312                                 float a = (2.0f * ox) / (std::sqrt(oy * oy + oz * oz));
 313                                 nx = ox * ox - oy * oy - oz * oz + cx;
 314                                 ny = a * (oy * oy - oz * oz) + cy;
 315                                 nz = a * 2.0f * oy * oz + cz;
 316                         }
 317                         break;
 318                 case 7: // 3D "Mandelbulb"
 319                         if (std::fabs(oy) < 0.000000001f) {
 320                                 nx = ox * ox - oz * oz + cx;
 321                                 ny = cy;
 322                                 nz = -2.0f * oz * std::sqrt(ox * ox) + cz;
 323                         } else {
 324                                 float a = 1.0f - (oz * oz) / (ox * ox + oy * oy);
 325                                 nx = (ox * ox - oy * oy) * a + cx;
 326                                 ny = 2.0f * ox * oy * a + cy;
 327                                 nz = -2.0f * oz * std::sqrt(ox * ox + oy * oy) + cz;
 328                         }
 329                         break;
 330                 case 8: // 3D "Cosine Mandelbulb"
 331                         if (std::fabs(oy) < 0.000000001f) {
 332                                 nx = 2.0f * ox * oz + cx;
 333                                 ny = 4.0f * oy * oz + cy;
 334                                 nz = oz * oz - ox * ox - oy * oy + cz;
 335                         } else {
 336                                 float a = (2.0f * oz) / std::sqrt(ox * ox + oy * oy);
 337                                 nx = (ox * ox - oy * oy) * a + cx;
 338                                 ny = 2.0f * ox * oy * a + cy;
 339                                 nz = oz * oz - ox * ox - oy * oy + cz;
 340                         }
 341                         break;
 342                 case 9: // 4D "Mandelbulb"
 343                         float rxy = std::sqrt(ox * ox + oy * oy);
 344                         float rxyz = std::sqrt(ox * ox + oy * oy + oz * oz);
 345                         if (std::fabs(ow) < 0.000000001f && std::fabs(oz) < 0.000000001f) {
 346                                 nx = (ox * ox - oy * oy) + cx;
 347                                 ny = 2.0f * ox * oy + cy;
 348                                 nz = -2.0f * rxy * oz + cz;
 349                                 nw = 2.0f * rxyz * ow + cw;
 350                         } else {
 351                                 float a = 1.0f - (ow * ow) / (rxyz * rxyz);
 352                                 float b = a * (1.0f - (oz * oz) / (rxy * rxy));
 353                                 nx = (ox * ox - oy * oy) * b + cx;
 354                                 ny = 2.0f * ox * oy * b + cy;
 355                                 nz = -2.0f * rxy * oz * a + cz;
 356                                 nw = 2.0f * rxyz * ow + cw;
 357                         }
 358                         break;
 359                 }
 360
 361                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 362                         return false;
 363
 364                 ox = nx;
 365                 oy = ny;
 366                 oz = nz;
 367                 ow = nw;
 368         }
 369
 370         return true;
 371 }
 372
 373
 374 s16 MapgenFractal::generateTerrain()
 375 {
 376         MapNode n_air(CONTENT_AIR);
 377         MapNode n_stone(c_stone);
 378         MapNode n_water(c_water_source);
 379
 380         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 381         u32 index2d = 0;
 382
 383         noise_seabed->perlinMap2D(node_min.X, node_min.Z);
 384
 385         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 386                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 387                         u32 vi = vm->m_area.index(node_min.X, y, z);
 388                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 389                                 if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 390                                         s16 seabed_height = noise_seabed->result[index2d];
 391
 392                                         if (y <= seabed_height || getFractalAtPoint(x, y, z)) {
 393                                                 vm->m_data[vi] = n_stone;
 394                                                 if (y > stone_surface_max_y)
 395                                                         stone_surface_max_y = y;
 396                                         } else if (y <= water_level) {
 397                                                 vm->m_data[vi] = n_water;
 398                                         } else {
 399                                                 vm->m_data[vi] = n_air;
 400                                         }
 401                                 }
 402                         }
 403                         index2d -= ystride;
 404                 }
 405                 index2d += ystride;
 406         }
 407
 408         return stone_surface_max_y;
 409 }