src/mapgen_fractal.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2010-2015 paramat, Matt Gregory
   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 "treegen.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, MapgenParams *params, EmergeManager *emerge)
  51         : MapgenBasic(mapgenid, params, emerge)
  52 {
  53         MapgenFractalParams *sp = (MapgenFractalParams *)params->sparams;
  54
  55         this->spflags    = sp->spflags;
  56         this->cave_width = sp->cave_width;
  57         this->fractal    = sp->fractal;
  58         this->iterations = sp->iterations;
  59         this->scale      = sp->scale;
  60         this->offset     = sp->offset;
  61         this->slice_w    = sp->slice_w;
  62         this->julia_x    = sp->julia_x;
  63         this->julia_y    = sp->julia_y;
  64         this->julia_z    = sp->julia_z;
  65         this->julia_w    = sp->julia_w;
  66
  67         //// 2D terrain noise
  68         noise_seabed       = new Noise(&sp->np_seabed, seed, csize.X, csize.Z);
  69         noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
  70
  71         MapgenBasic::np_cave1 = sp->np_cave1;
  72         MapgenBasic::np_cave2 = sp->np_cave2;
  73
  74         this->formula = fractal / 2 + fractal % 2;
  75         this->julia   = fractal % 2 == 0;
  76 }
  77
  78
  79 MapgenFractal::~MapgenFractal()
  80 {
  81         delete noise_seabed;
  82         delete noise_filler_depth;
  83 }
  84
  85
  86 MapgenFractalParams::MapgenFractalParams()
  87 {
  88         spflags    = 0;
  89         cave_width = 0.3;
  90         fractal    = 1;
  91         iterations = 11;
  92         scale      = v3f(4096.0, 1024.0, 4096.0);
  93         offset     = v3f(1.79, 0.0, 0.0);
  94         slice_w    = 0.0;
  95         julia_x    = 0.33;
  96         julia_y    = 0.33;
  97         julia_z    = 0.33;
  98         julia_w    = 0.33;
  99
 100         np_seabed       = NoiseParams(-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0);
 101         np_filler_depth = NoiseParams(0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0);
 102         np_cave1        = NoiseParams(0,   12,  v3f(96,  96,  96),  52534, 4, 0.5, 2.0);
 103         np_cave2        = NoiseParams(0,   12,  v3f(96,  96,  96),  10325, 4, 0.5, 2.0);
 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->getU16NoEx("mgfractal_fractal",      fractal);
 112         settings->getU16NoEx("mgfractal_iterations",   iterations);
 113         settings->getV3FNoEx("mgfractal_scale",        scale);
 114         settings->getV3FNoEx("mgfractal_offset",       offset);
 115         settings->getFloatNoEx("mgfractal_slice_w",    slice_w);
 116         settings->getFloatNoEx("mgfractal_julia_x",    julia_x);
 117         settings->getFloatNoEx("mgfractal_julia_y",    julia_y);
 118         settings->getFloatNoEx("mgfractal_julia_z",    julia_z);
 119         settings->getFloatNoEx("mgfractal_julia_w",    julia_w);
 120
 121         settings->getNoiseParams("mgfractal_np_seabed",       np_seabed);
 122         settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 123         settings->getNoiseParams("mgfractal_np_cave1",        np_cave1);
 124         settings->getNoiseParams("mgfractal_np_cave2",        np_cave2);
 125 }
 126
 127
 128 void MapgenFractalParams::writeParams(Settings *settings) const
 129 {
 130         settings->setFlagStr("mgfractal_spflags",  spflags, flagdesc_mapgen_fractal, U32_MAX);
 131         settings->setFloat("mgfractal_cave_width", cave_width);
 132         settings->setU16("mgfractal_fractal",      fractal);
 133         settings->setU16("mgfractal_iterations",   iterations);
 134         settings->setV3F("mgfractal_scale",        scale);
 135         settings->setV3F("mgfractal_offset",       offset);
 136         settings->setFloat("mgfractal_slice_w",    slice_w);
 137         settings->setFloat("mgfractal_julia_x",    julia_x);
 138         settings->setFloat("mgfractal_julia_y",    julia_y);
 139         settings->setFloat("mgfractal_julia_z",    julia_z);
 140         settings->setFloat("mgfractal_julia_w",    julia_w);
 141
 142         settings->setNoiseParams("mgfractal_np_seabed",       np_seabed);
 143         settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 144         settings->setNoiseParams("mgfractal_np_cave1",        np_cave1);
 145         settings->setNoiseParams("mgfractal_np_cave2",        np_cave2);
 146 }
 147
 148
 149 /////////////////////////////////////////////////////////////////
 150
 151
 152 int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 153 {
 154         bool solid_below = false;  // Dry solid node is present below to spawn on
 155         u8 air_count = 0;  // Consecutive air nodes above the dry solid node
 156         s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
 157         // Seabed can rise above water_level or might be raised to create dry land
 158         s16 search_start = MYMAX(seabed_level, water_level + 1);
 159         if (seabed_level > water_level)
 160                 solid_below = true;
 161
 162         for (s16 y = search_start; y <= search_start + 128; y++) {
 163                 if (getFractalAtPoint(p.X, y, p.Y)) {  // Fractal node
 164                         solid_below = true;
 165                         air_count = 0;
 166                 } else if (solid_below) {  // Air above solid node
 167                         air_count++;
 168                         if (air_count == 2)
 169                                 return y - 2;
 170                 }
 171         }
 172
 173         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 174 }
 175
 176
 177 void MapgenFractal::makeChunk(BlockMakeData *data)
 178 {
 179         // Pre-conditions
 180         assert(data->vmanip);
 181         assert(data->nodedef);
 182         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 183                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 184                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 185         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 186                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 187                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 188
 189         this->generating = true;
 190         this->vm   = data->vmanip;
 191         this->ndef = data->nodedef;
 192         //TimeTaker t("makeChunk");
 193
 194         v3s16 blockpos_min = data->blockpos_min;
 195         v3s16 blockpos_max = data->blockpos_max;
 196         node_min = blockpos_min * MAP_BLOCKSIZE;
 197         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 198         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 199         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 200
 201         blockseed = getBlockSeed2(full_node_min, seed);
 202
 203         // Generate base terrain, mountains, and ridges with initial heightmaps
 204         s16 stone_surface_max_y = generateTerrain();
 205
 206         // Create heightmap
 207         updateHeightmap(node_min, node_max);
 208
 209         // Init biome generator, place biome-specific nodes, and build biomemap
 210         biomegen->calcBiomeNoise(node_min);
 211         MgStoneType stone_type = generateBiomes();
 212
 213         if (flags & MG_CAVES)
 214                 generateCaves(stone_surface_max_y, MGFRACTAL_LARGE_CAVE_DEPTH);
 215
 216         if (flags & MG_DUNGEONS)
 217                 generateDungeons(stone_surface_max_y, stone_type);
 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
 275                 if (formula == 1) {  // 4D "Roundy"
 276                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 277                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 278                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 279                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 280                 } else if (formula == 2) {  // 4D "Squarry"
 281                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 282                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 283                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 284                         nw = 2.0f * (ox * ow - oy * oz) + cw;
 285                 } else if (formula == 3) {  // 4D "Mandy Cousin"
 286                         nx = ox * ox - oy * oy - oz * oz + ow * ow + cx;
 287                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 288                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 289                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 290                 } else if (formula == 4) {  // 4D "Variation"
 291                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 292                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 293                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 294                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 295                 } else if (formula == 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                 } else if (formula == 6) {  // 3D "Christmas Tree"
 300                         // Altering the formula here is necessary to avoid division by zero
 301                         if (fabs(oz) < 0.000000001f) {
 302                                 nx = ox * ox - oy * oy - oz * oz + cx;
 303                                 ny = 2.0f * oy * ox + cy;
 304                                 nz = 4.0f * oz * ox + cz;
 305                         } else {
 306                                 float a = (2.0f * ox) / (sqrt(oy * oy + oz * oz));
 307                                 nx = ox * ox - oy * oy - oz * oz + cx;
 308                                 ny = a * (oy * oy - oz * oz) + cy;
 309                                 nz = a * 2.0f * oy * oz + cz;
 310                         }
 311                 } else if (formula == 7) {  // 3D "Mandelbulb"
 312                         if (fabs(oy) < 0.000000001f) {
 313                                 nx = ox * ox - oz * oz + cx;
 314                                 ny = cy;
 315                                 nz = -2.0f * oz * sqrt(ox * ox) + cz;
 316                         } else {
 317                                 float a = 1.0f - (oz * oz) / (ox * ox + oy * oy);
 318                                 nx = (ox * ox - oy * oy) * a + cx;
 319                                 ny = 2.0f * ox * oy * a + cy;
 320                                 nz = -2.0f * oz * sqrt(ox * ox + oy * oy) + cz;
 321                         }
 322                 } else if (formula == 8) {  // 3D "Cosine Mandelbulb"
 323                         if (fabs(oy) < 0.000000001f) {
 324                                 nx = 2.0f * ox * oz + cx;
 325                                 ny = 4.0f * oy * oz + cy;
 326                                 nz = oz * oz - ox * ox - oy * oy + cz;
 327                         } else {
 328                                 float a = (2.0f * oz) / sqrt(ox * ox + oy * oy);
 329                                 nx = (ox * ox - oy * oy) * a + cx;
 330                                 ny = 2.0f * ox * oy * a + cy;
 331                                 nz = oz * oz - ox * ox - oy * oy + cz;
 332                         }
 333                 } else if (formula == 9) {  // 4D "Mandelbulb"
 334                         float rxy = sqrt(ox * ox + oy * oy);
 335                         float rxyz = sqrt(ox * ox + oy * oy + oz * oz);
 336                         if (fabs(ow) < 0.000000001f && fabs(oz) < 0.000000001f) {
 337                                 nx = (ox * ox - oy * oy) + cx;
 338                                 ny = 2.0f * ox * oy + cy;
 339                                 nz = -2.0f * rxy * oz + cz;
 340                                 nw = 2.0f * rxyz * ow + cw;
 341                         } else {
 342                                 float a = 1.0f - (ow * ow) / (rxyz * rxyz);
 343                                 float b = a * (1.0f - (oz * oz) / (rxy * rxy));
 344                                 nx = (ox * ox - oy * oy) * b + cx;
 345                                 ny = 2.0f * ox * oy * b + cy;
 346                                 nz = -2.0f * rxy * oz * a + cz;
 347                                 nw = 2.0f * rxyz * ow + cw;
 348                         }
 349                 }
 350
 351                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 352                         return false;
 353
 354                 ox = nx;
 355                 oy = ny;
 356                 oz = nz;
 357                 ow = nw;
 358         }
 359
 360         return true;
 361 }
 362
 363
 364 s16 MapgenFractal::generateTerrain()
 365 {
 366         MapNode n_air(CONTENT_AIR);
 367         MapNode n_stone(c_stone);
 368         MapNode n_water(c_water_source);
 369
 370         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 371         u32 index2d = 0;
 372
 373         noise_seabed->perlinMap2D(node_min.X, node_min.Z);
 374
 375         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 376                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 377                         u32 vi = vm->m_area.index(node_min.X, y, z);
 378                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 379                                 if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 380                                         s16 seabed_height = noise_seabed->result[index2d];
 381
 382                                         if (y <= seabed_height || getFractalAtPoint(x, y, z)) {
 383                                                 vm->m_data[vi] = n_stone;
 384                                                 if (y > stone_surface_max_y)
 385                                                         stone_surface_max_y = y;
 386                                         } else if (y <= water_level) {
 387                                                 vm->m_data[vi] = n_water;
 388                                         } else {
 389                                                 vm->m_data[vi] = n_air;
 390                                         }
 391                                 }
 392                         }
 393                         index2d -= ystride;
 394                 }
 395                 index2d += ystride;
 396         }
 397
 398         return stone_surface_max_y;
 399 }