src/mapgen/mapgen_fractal.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2015-2017 paramat
   4 Copyright (C) 2015-2016 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 "voxel.h"
  24 #include "noise.h"
  25 #include "mapblock.h"
  26 #include "mapnode.h"
  27 #include "map.h"
  28 #include "content_sao.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         {NULL,    0}
  44 };
  45
  46 ///////////////////////////////////////////////////////////////////////////////////////
  47
  48
  49 MapgenFractal::MapgenFractal(int mapgenid, MapgenFractalParams *params, EmergeManager *emerge)
  50         : MapgenBasic(mapgenid, params, emerge)
  51 {
  52         spflags          = params->spflags;
  53         cave_width       = params->cave_width;
  54         large_cave_depth = params->large_cave_depth;
  55         lava_depth       = params->lava_depth;
  56         fractal          = params->fractal;
  57         iterations       = params->iterations;
  58         scale            = params->scale;
  59         offset           = params->offset;
  60         slice_w          = params->slice_w;
  61         julia_x          = params->julia_x;
  62         julia_y          = params->julia_y;
  63         julia_z          = params->julia_z;
  64         julia_w          = params->julia_w;
  65
  66         //// 2D terrain noise
  67         noise_seabed       = new Noise(&params->np_seabed, seed, csize.X, csize.Z);
  68         noise_filler_depth = new Noise(&params->np_filler_depth, seed, csize.X, csize.Z);
  69
  70         MapgenBasic::np_cave1 = params->np_cave1;
  71         MapgenBasic::np_cave2 = params->np_cave2;
  72
  73         formula = fractal / 2 + fractal % 2;
  74         julia   = fractal % 2 == 0;
  75 }
  76
  77
  78 MapgenFractal::~MapgenFractal()
  79 {
  80         delete noise_seabed;
  81         delete noise_filler_depth;
  82 }
  83
  84
  85 MapgenFractalParams::MapgenFractalParams():
  86         np_seabed       (-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0),
  87         np_filler_depth (0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0),
  88         np_cave1        (0,   12,  v3f(61,  61,  61),  52534, 3, 0.5, 2.0),
  89         np_cave2        (0,   12,  v3f(67,  67,  67),  10325, 3, 0.5, 2.0)
  90 {
  91 }
  92
  93
  94 void MapgenFractalParams::readParams(const Settings *settings)
  95 {
  96         settings->getFlagStrNoEx("mgfractal_spflags",      spflags, flagdesc_mapgen_fractal);
  97         settings->getFloatNoEx("mgfractal_cave_width",     cave_width);
  98         settings->getS16NoEx("mgfractal_large_cave_depth", large_cave_depth);
  99         settings->getS16NoEx("mgfractal_lava_depth",       lava_depth);
 100         settings->getU16NoEx("mgfractal_fractal",          fractal);
 101         settings->getU16NoEx("mgfractal_iterations",       iterations);
 102         settings->getV3FNoEx("mgfractal_scale",            scale);
 103         settings->getV3FNoEx("mgfractal_offset",           offset);
 104         settings->getFloatNoEx("mgfractal_slice_w",        slice_w);
 105         settings->getFloatNoEx("mgfractal_julia_x",        julia_x);
 106         settings->getFloatNoEx("mgfractal_julia_y",        julia_y);
 107         settings->getFloatNoEx("mgfractal_julia_z",        julia_z);
 108         settings->getFloatNoEx("mgfractal_julia_w",        julia_w);
 109
 110         settings->getNoiseParams("mgfractal_np_seabed",       np_seabed);
 111         settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 112         settings->getNoiseParams("mgfractal_np_cave1",        np_cave1);
 113         settings->getNoiseParams("mgfractal_np_cave2",        np_cave2);
 114 }
 115
 116
 117 void MapgenFractalParams::writeParams(Settings *settings) const
 118 {
 119         settings->setFlagStr("mgfractal_spflags",      spflags, flagdesc_mapgen_fractal, U32_MAX);
 120         settings->setFloat("mgfractal_cave_width",     cave_width);
 121         settings->setS16("mgfractal_large_cave_depth", large_cave_depth);
 122         settings->setS16("mgfractal_lava_depth",       lava_depth);
 123         settings->setU16("mgfractal_fractal",          fractal);
 124         settings->setU16("mgfractal_iterations",       iterations);
 125         settings->setV3F("mgfractal_scale",            scale);
 126         settings->setV3F("mgfractal_offset",           offset);
 127         settings->setFloat("mgfractal_slice_w",        slice_w);
 128         settings->setFloat("mgfractal_julia_x",        julia_x);
 129         settings->setFloat("mgfractal_julia_y",        julia_y);
 130         settings->setFloat("mgfractal_julia_z",        julia_z);
 131         settings->setFloat("mgfractal_julia_w",        julia_w);
 132
 133         settings->setNoiseParams("mgfractal_np_seabed",       np_seabed);
 134         settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 135         settings->setNoiseParams("mgfractal_np_cave1",        np_cave1);
 136         settings->setNoiseParams("mgfractal_np_cave2",        np_cave2);
 137 }
 138
 139
 140 /////////////////////////////////////////////////////////////////
 141
 142
 143 int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 144 {
 145         bool solid_below = false;  // Dry solid node is present below to spawn on
 146         u8 air_count = 0;  // Consecutive air nodes above the dry solid node
 147         s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
 148         // Seabed can rise above water_level or might be raised to create dry land
 149         s16 search_start = MYMAX(seabed_level, water_level + 1);
 150         if (seabed_level > water_level)
 151                 solid_below = true;
 152
 153         for (s16 y = search_start; y <= search_start + 128; y++) {
 154                 if (getFractalAtPoint(p.X, y, p.Y)) {  // Fractal node
 155                         solid_below = true;
 156                         air_count = 0;
 157                 } else if (solid_below) {  // Air above solid node
 158                         air_count++;
 159                         // 3 to account for snowblock dust
 160                         if (air_count == 3)
 161                                 return y - 2;
 162                 }
 163         }
 164
 165         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 166 }
 167
 168
 169 void MapgenFractal::makeChunk(BlockMakeData *data)
 170 {
 171         // Pre-conditions
 172         assert(data->vmanip);
 173         assert(data->nodedef);
 174         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 175                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 176                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 177         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 178                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 179                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 180
 181         this->generating = true;
 182         this->vm   = data->vmanip;
 183         this->ndef = data->nodedef;
 184         //TimeTaker t("makeChunk");
 185
 186         v3s16 blockpos_min = data->blockpos_min;
 187         v3s16 blockpos_max = data->blockpos_max;
 188         node_min = blockpos_min * MAP_BLOCKSIZE;
 189         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 190         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 191         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 192
 193         blockseed = getBlockSeed2(full_node_min, seed);
 194
 195         // Generate base terrain, mountains, and ridges with initial heightmaps
 196         s16 stone_surface_max_y = generateTerrain();
 197
 198         // Create heightmap
 199         updateHeightmap(node_min, node_max);
 200
 201         // Init biome generator, place biome-specific nodes, and build biomemap
 202         biomegen->calcBiomeNoise(node_min);
 203
 204         MgStoneType mgstone_type;
 205         content_t biome_stone;
 206         generateBiomes(&mgstone_type, &biome_stone);
 207
 208         if (flags & MG_CAVES)
 209                 generateCaves(stone_surface_max_y, large_cave_depth);
 210
 211         if (flags & MG_DUNGEONS)
 212                 generateDungeons(stone_surface_max_y, mgstone_type, biome_stone);
 213
 214         // Generate the registered decorations
 215         if (flags & MG_DECORATIONS)
 216                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 217
 218         // Generate the registered ores
 219         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 220
 221         // Sprinkle some dust on top after everything else was generated
 222         dustTopNodes();
 223
 224         //printf("makeChunk: %dms\n", t.stop());
 225
 226         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 227
 228         if (flags & MG_LIGHT)
 229                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 230                         full_node_min, full_node_max);
 231
 232         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 233         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 234
 235         this->generating = false;
 236 }
 237
 238
 239 bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
 240 {
 241         float cx, cy, cz, cw, ox, oy, oz, ow;
 242
 243         if (julia) {  // Julia set
 244                 cx = julia_x;
 245                 cy = julia_y;
 246                 cz = julia_z;
 247                 cw = julia_w;
 248                 ox = (float)x / scale.X - offset.X;
 249                 oy = (float)y / scale.Y - offset.Y;
 250                 oz = (float)z / scale.Z - offset.Z;
 251                 ow = slice_w;
 252         } else {  // Mandelbrot set
 253                 cx = (float)x / scale.X - offset.X;
 254                 cy = (float)y / scale.Y - offset.Y;
 255                 cz = (float)z / scale.Z - offset.Z;
 256                 cw = slice_w;
 257                 ox = 0.0f;
 258                 oy = 0.0f;
 259                 oz = 0.0f;
 260                 ow = 0.0f;
 261         }
 262
 263         float nx = 0.0f;
 264         float ny = 0.0f;
 265         float nz = 0.0f;
 266         float nw = 0.0f;
 267
 268         for (u16 iter = 0; iter < iterations; iter++) {
 269                 switch (formula) {
 270                 default:
 271                 case 1: // 4D "Roundy"
 272                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 273                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 274                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 275                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 276                         break;
 277                 case 2: // 4D "Squarry"
 278                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 279                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 280                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 281                         nw = 2.0f * (ox * ow - oy * oz) + cw;
 282                         break;
 283                 case 3: // 4D "Mandy Cousin"
 284                         nx = ox * ox - oy * oy - oz * oz + ow * ow + cx;
 285                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 286                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 287                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 288                         break;
 289                 case 4: // 4D "Variation"
 290                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 291                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 292                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 293                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 294                         break;
 295                 case 5: // 3D "Mandelbrot/Mandelbar"
 296                         nx = ox * ox - oy * oy - oz * oz + cx;
 297                         ny = 2.0f * ox * oy + cy;
 298                         nz = -2.0f * ox * oz + cz;
 299                         break;
 300                 case 6: // 3D "Christmas Tree"
 301                         // Altering the formula here is necessary to avoid division by zero
 302                         if (fabs(oz) < 0.000000001f) {
 303                                 nx = ox * ox - oy * oy - oz * oz + cx;
 304                                 ny = 2.0f * oy * ox + cy;
 305                                 nz = 4.0f * oz * ox + cz;
 306                         } else {
 307                                 float a = (2.0f * ox) / (sqrt(oy * oy + oz * oz));
 308                                 nx = ox * ox - oy * oy - oz * oz + cx;
 309                                 ny = a * (oy * oy - oz * oz) + cy;
 310                                 nz = a * 2.0f * oy * oz + cz;
 311                         }
 312                         break;
 313                 case 7: // 3D "Mandelbulb"
 314                         if (fabs(oy) < 0.000000001f) {
 315                                 nx = ox * ox - oz * oz + cx;
 316                                 ny = cy;
 317                                 nz = -2.0f * oz * sqrt(ox * ox) + cz;
 318                         } else {
 319                                 float a = 1.0f - (oz * oz) / (ox * ox + oy * oy);
 320                                 nx = (ox * ox - oy * oy) * a + cx;
 321                                 ny = 2.0f * ox * oy * a + cy;
 322                                 nz = -2.0f * oz * sqrt(ox * ox + oy * oy) + cz;
 323                         }
 324                         break;
 325                 case 8: // 3D "Cosine Mandelbulb"
 326                         if (fabs(oy) < 0.000000001f) {
 327                                 nx = 2.0f * ox * oz + cx;
 328                                 ny = 4.0f * oy * oz + cy;
 329                                 nz = oz * oz - ox * ox - oy * oy + cz;
 330                         } else {
 331                                 float a = (2.0f * oz) / sqrt(ox * ox + oy * oy);
 332                                 nx = (ox * ox - oy * oy) * a + cx;
 333                                 ny = 2.0f * ox * oy * a + cy;
 334                                 nz = oz * oz - ox * ox - oy * oy + cz;
 335                         }
 336                         break;
 337                 case 9: // 4D "Mandelbulb"
 338                         float rxy = sqrt(ox * ox + oy * oy);
 339                         float rxyz = sqrt(ox * ox + oy * oy + oz * oz);
 340                         if (fabs(ow) < 0.000000001f && fabs(oz) < 0.000000001f) {
 341                                 nx = (ox * ox - oy * oy) + cx;
 342                                 ny = 2.0f * ox * oy + cy;
 343                                 nz = -2.0f * rxy * oz + cz;
 344                                 nw = 2.0f * rxyz * ow + cw;
 345                         } else {
 346                                 float a = 1.0f - (ow * ow) / (rxyz * rxyz);
 347                                 float b = a * (1.0f - (oz * oz) / (rxy * rxy));
 348                                 nx = (ox * ox - oy * oy) * b + cx;
 349                                 ny = 2.0f * ox * oy * b + cy;
 350                                 nz = -2.0f * rxy * oz * a + cz;
 351                                 nw = 2.0f * rxyz * ow + cw;
 352                         }
 353                         break;
 354                 }
 355
 356                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 357                         return false;
 358
 359                 ox = nx;
 360                 oy = ny;
 361                 oz = nz;
 362                 ow = nw;
 363         }
 364
 365         return true;
 366 }
 367
 368
 369 s16 MapgenFractal::generateTerrain()
 370 {
 371         MapNode n_air(CONTENT_AIR);
 372         MapNode n_stone(c_stone);
 373         MapNode n_water(c_water_source);
 374
 375         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 376         u32 index2d = 0;
 377
 378         noise_seabed->perlinMap2D(node_min.X, node_min.Z);
 379
 380         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 381                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 382                         u32 vi = vm->m_area.index(node_min.X, y, z);
 383                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 384                                 if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 385                                         s16 seabed_height = noise_seabed->result[index2d];
 386
 387                                         if (y <= seabed_height || getFractalAtPoint(x, y, z)) {
 388                                                 vm->m_data[vi] = n_stone;
 389                                                 if (y > stone_surface_max_y)
 390                                                         stone_surface_max_y = y;
 391                                         } else if (y <= water_level) {
 392                                                 vm->m_data[vi] = n_water;
 393                                         } else {
 394                                                 vm->m_data[vi] = n_air;
 395                                         }
 396                                 }
 397                         }
 398                         index2d -= ystride;
 399                 }
 400                 index2d += ystride;
 401         }
 402
 403         return stone_surface_max_y;
 404 }