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 "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         spflags    = 0;
  86         cave_width = 0.09;
  87         fractal    = 1;
  88         iterations = 11;
  89         scale      = v3f(4096.0, 1024.0, 4096.0);
  90         offset     = v3f(1.79, 0.0, 0.0);
  91         slice_w    = 0.0;
  92         julia_x    = 0.33;
  93         julia_y    = 0.33;
  94         julia_z    = 0.33;
  95         julia_w    = 0.33;
  96
  97         np_seabed       = NoiseParams(-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0);
  98         np_filler_depth = NoiseParams(0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0);
  99         np_cave1        = NoiseParams(0,   12,  v3f(61,  61,  61),  52534, 3, 0.5, 2.0);
 100         np_cave2        = NoiseParams(0,   12,  v3f(67,  67,  67),  10325, 3, 0.5, 2.0);
 101 }
 102
 103
 104 void MapgenFractalParams::readParams(const Settings *settings)
 105 {
 106         settings->getFlagStrNoEx("mgfractal_spflags",  spflags, flagdesc_mapgen_fractal);
 107         settings->getFloatNoEx("mgfractal_cave_width", cave_width);
 108         settings->getU16NoEx("mgfractal_fractal",      fractal);
 109         settings->getU16NoEx("mgfractal_iterations",   iterations);
 110         settings->getV3FNoEx("mgfractal_scale",        scale);
 111         settings->getV3FNoEx("mgfractal_offset",       offset);
 112         settings->getFloatNoEx("mgfractal_slice_w",    slice_w);
 113         settings->getFloatNoEx("mgfractal_julia_x",    julia_x);
 114         settings->getFloatNoEx("mgfractal_julia_y",    julia_y);
 115         settings->getFloatNoEx("mgfractal_julia_z",    julia_z);
 116         settings->getFloatNoEx("mgfractal_julia_w",    julia_w);
 117
 118         settings->getNoiseParams("mgfractal_np_seabed",       np_seabed);
 119         settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 120         settings->getNoiseParams("mgfractal_np_cave1",        np_cave1);
 121         settings->getNoiseParams("mgfractal_np_cave2",        np_cave2);
 122 }
 123
 124
 125 void MapgenFractalParams::writeParams(Settings *settings) const
 126 {
 127         settings->setFlagStr("mgfractal_spflags",  spflags, flagdesc_mapgen_fractal, U32_MAX);
 128         settings->setFloat("mgfractal_cave_width", cave_width);
 129         settings->setU16("mgfractal_fractal",      fractal);
 130         settings->setU16("mgfractal_iterations",   iterations);
 131         settings->setV3F("mgfractal_scale",        scale);
 132         settings->setV3F("mgfractal_offset",       offset);
 133         settings->setFloat("mgfractal_slice_w",    slice_w);
 134         settings->setFloat("mgfractal_julia_x",    julia_x);
 135         settings->setFloat("mgfractal_julia_y",    julia_y);
 136         settings->setFloat("mgfractal_julia_z",    julia_z);
 137         settings->setFloat("mgfractal_julia_w",    julia_w);
 138
 139         settings->setNoiseParams("mgfractal_np_seabed",       np_seabed);
 140         settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
 141         settings->setNoiseParams("mgfractal_np_cave1",        np_cave1);
 142         settings->setNoiseParams("mgfractal_np_cave2",        np_cave2);
 143 }
 144
 145
 146 /////////////////////////////////////////////////////////////////
 147
 148
 149 int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 150 {
 151         bool solid_below = false;  // Dry solid node is present below to spawn on
 152         u8 air_count = 0;  // Consecutive air nodes above the dry solid node
 153         s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
 154         // Seabed can rise above water_level or might be raised to create dry land
 155         s16 search_start = MYMAX(seabed_level, water_level + 1);
 156         if (seabed_level > water_level)
 157                 solid_below = true;
 158
 159         for (s16 y = search_start; y <= search_start + 128; y++) {
 160                 if (getFractalAtPoint(p.X, y, p.Y)) {  // Fractal node
 161                         solid_below = true;
 162                         air_count = 0;
 163                 } else if (solid_below) {  // Air above solid node
 164                         air_count++;
 165                         if (air_count == 2)
 166                                 return y - 2;
 167                 }
 168         }
 169
 170         return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 171 }
 172
 173
 174 void MapgenFractal::makeChunk(BlockMakeData *data)
 175 {
 176         // Pre-conditions
 177         assert(data->vmanip);
 178         assert(data->nodedef);
 179         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 180                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 181                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 182         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 183                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 184                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 185
 186         this->generating = true;
 187         this->vm   = data->vmanip;
 188         this->ndef = data->nodedef;
 189         //TimeTaker t("makeChunk");
 190
 191         v3s16 blockpos_min = data->blockpos_min;
 192         v3s16 blockpos_max = data->blockpos_max;
 193         node_min = blockpos_min * MAP_BLOCKSIZE;
 194         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 195         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 196         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 197
 198         blockseed = getBlockSeed2(full_node_min, seed);
 199
 200         // Generate base terrain, mountains, and ridges with initial heightmaps
 201         s16 stone_surface_max_y = generateTerrain();
 202
 203         // Create heightmap
 204         updateHeightmap(node_min, node_max);
 205
 206         // Init biome generator, place biome-specific nodes, and build biomemap
 207         biomegen->calcBiomeNoise(node_min);
 208         MgStoneType stone_type = generateBiomes();
 209
 210         if (flags & MG_CAVES)
 211                 generateCaves(stone_surface_max_y, MGFRACTAL_LARGE_CAVE_DEPTH);
 212
 213         if (flags & MG_DUNGEONS)
 214                 generateDungeons(stone_surface_max_y, stone_type);
 215
 216         // Generate the registered decorations
 217         if (flags & MG_DECORATIONS)
 218                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 219
 220         // Generate the registered ores
 221         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 222
 223         // Sprinkle some dust on top after everything else was generated
 224         dustTopNodes();
 225
 226         //printf("makeChunk: %dms\n", t.stop());
 227
 228         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 229
 230         if (flags & MG_LIGHT)
 231                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 232                         full_node_min, full_node_max);
 233
 234         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 235         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 236
 237         this->generating = false;
 238 }
 239
 240
 241 bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
 242 {
 243         float cx, cy, cz, cw, ox, oy, oz, ow;
 244
 245         if (julia) {  // Julia set
 246                 cx = julia_x;
 247                 cy = julia_y;
 248                 cz = julia_z;
 249                 cw = julia_w;
 250                 ox = (float)x / scale.X - offset.X;
 251                 oy = (float)y / scale.Y - offset.Y;
 252                 oz = (float)z / scale.Z - offset.Z;
 253                 ow = slice_w;
 254         } else {  // Mandelbrot set
 255                 cx = (float)x / scale.X - offset.X;
 256                 cy = (float)y / scale.Y - offset.Y;
 257                 cz = (float)z / scale.Z - offset.Z;
 258                 cw = slice_w;
 259                 ox = 0.0f;
 260                 oy = 0.0f;
 261                 oz = 0.0f;
 262                 ow = 0.0f;
 263         }
 264
 265         float nx = 0.0f;
 266         float ny = 0.0f;
 267         float nz = 0.0f;
 268         float nw = 0.0f;
 269
 270         for (u16 iter = 0; iter < iterations; iter++) {
 271
 272                 if (formula == 1) {  // 4D "Roundy"
 273                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 274                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 275                         nz = 2.0f * (ox * oz + oy * ow) + cz;
 276                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 277                 } else if (formula == 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                 } else if (formula == 3) {  // 4D "Mandy Cousin"
 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                 } else if (formula == 4) {  // 4D "Variation"
 288                         nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
 289                         ny = 2.0f * (ox * oy + oz * ow) + cy;
 290                         nz = 2.0f * (ox * oz - oy * ow) + cz;
 291                         nw = 2.0f * (ox * ow + oy * oz) + cw;
 292                 } else if (formula == 5) {  // 3D "Mandelbrot/Mandelbar"
 293                         nx = ox * ox - oy * oy - oz * oz + cx;
 294                         ny = 2.0f * ox * oy + cy;
 295                         nz = -2.0f * ox * oz + cz;
 296                 } else if (formula == 6) {  // 3D "Christmas Tree"
 297                         // Altering the formula here is necessary to avoid division by zero
 298                         if (fabs(oz) < 0.000000001f) {
 299                                 nx = ox * ox - oy * oy - oz * oz + cx;
 300                                 ny = 2.0f * oy * ox + cy;
 301                                 nz = 4.0f * oz * ox + cz;
 302                         } else {
 303                                 float a = (2.0f * ox) / (sqrt(oy * oy + oz * oz));
 304                                 nx = ox * ox - oy * oy - oz * oz + cx;
 305                                 ny = a * (oy * oy - oz * oz) + cy;
 306                                 nz = a * 2.0f * oy * oz + cz;
 307                         }
 308                 } else if (formula == 7) {  // 3D "Mandelbulb"
 309                         if (fabs(oy) < 0.000000001f) {
 310                                 nx = ox * ox - oz * oz + cx;
 311                                 ny = cy;
 312                                 nz = -2.0f * oz * sqrt(ox * ox) + cz;
 313                         } else {
 314                                 float a = 1.0f - (oz * oz) / (ox * ox + oy * oy);
 315                                 nx = (ox * ox - oy * oy) * a + cx;
 316                                 ny = 2.0f * ox * oy * a + cy;
 317                                 nz = -2.0f * oz * sqrt(ox * ox + oy * oy) + cz;
 318                         }
 319                 } else if (formula == 8) {  // 3D "Cosine Mandelbulb"
 320                         if (fabs(oy) < 0.000000001f) {
 321                                 nx = 2.0f * ox * oz + cx;
 322                                 ny = 4.0f * oy * oz + cy;
 323                                 nz = oz * oz - ox * ox - oy * oy + cz;
 324                         } else {
 325                                 float a = (2.0f * oz) / sqrt(ox * ox + oy * oy);
 326                                 nx = (ox * ox - oy * oy) * a + cx;
 327                                 ny = 2.0f * ox * oy * a + cy;
 328                                 nz = oz * oz - ox * ox - oy * oy + cz;
 329                         }
 330                 } else if (formula == 9) {  // 4D "Mandelbulb"
 331                         float rxy = sqrt(ox * ox + oy * oy);
 332                         float rxyz = sqrt(ox * ox + oy * oy + oz * oz);
 333                         if (fabs(ow) < 0.000000001f && fabs(oz) < 0.000000001f) {
 334                                 nx = (ox * ox - oy * oy) + cx;
 335                                 ny = 2.0f * ox * oy + cy;
 336                                 nz = -2.0f * rxy * oz + cz;
 337                                 nw = 2.0f * rxyz * ow + cw;
 338                         } else {
 339                                 float a = 1.0f - (ow * ow) / (rxyz * rxyz);
 340                                 float b = a * (1.0f - (oz * oz) / (rxy * rxy));
 341                                 nx = (ox * ox - oy * oy) * b + cx;
 342                                 ny = 2.0f * ox * oy * b + cy;
 343                                 nz = -2.0f * rxy * oz * a + cz;
 344                                 nw = 2.0f * rxyz * ow + cw;
 345                         }
 346                 }
 347
 348                 if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
 349                         return false;
 350
 351                 ox = nx;
 352                 oy = ny;
 353                 oz = nz;
 354                 ow = nw;
 355         }
 356
 357         return true;
 358 }
 359
 360
 361 s16 MapgenFractal::generateTerrain()
 362 {
 363         MapNode n_air(CONTENT_AIR);
 364         MapNode n_stone(c_stone);
 365         MapNode n_water(c_water_source);
 366
 367         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 368         u32 index2d = 0;
 369
 370         noise_seabed->perlinMap2D(node_min.X, node_min.Z);
 371
 372         for (s16 z = node_min.Z; z <= node_max.Z; z++) {
 373                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 374                         u32 vi = vm->m_area.index(node_min.X, y, z);
 375                         for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
 376                                 if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 377                                         s16 seabed_height = noise_seabed->result[index2d];
 378
 379                                         if (y <= seabed_height || getFractalAtPoint(x, y, z)) {
 380                                                 vm->m_data[vi] = n_stone;
 381                                                 if (y > stone_surface_max_y)
 382                                                         stone_surface_max_y = y;
 383                                         } else if (y <= water_level) {
 384                                                 vm->m_data[vi] = n_water;
 385                                         } else {
 386                                                 vm->m_data[vi] = n_air;
 387                                         }
 388                                 }
 389                         }
 390                         index2d -= ystride;
 391                 }
 392                 index2d += ystride;
 393         }
 394
 395         return stone_surface_max_y;
 396 }