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