src/mapgen/mg_biome.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2014-2018 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2014-2018 paramat
   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 #include "mg_biome.h"
  22 #include "mg_decoration.h"
  23 #include "emerge.h"
  24 #include "server.h"
  25 #include "nodedef.h"
  26 #include "map.h" //for MMVManip
  27 #include "util/numeric.h"
  28 #include "porting.h"
  29 #include "settings.h"
  30
  31
  32 ///////////////////////////////////////////////////////////////////////////////
  33
  34
  35 BiomeManager::BiomeManager(Server *server) :
  36         ObjDefManager(server, OBJDEF_BIOME)
  37 {
  38         m_server = server;
  39
  40         // Create default biome to be used in case none exist
  41         Biome *b = new Biome;
  42
  43         b->name            = "default";
  44         b->flags           = 0;
  45         b->depth_top       = 0;
  46         b->depth_filler    = -MAX_MAP_GENERATION_LIMIT;
  47         b->depth_water_top = 0;
  48         b->depth_riverbed  = 0;
  49         b->min_pos         = v3s16(-MAX_MAP_GENERATION_LIMIT,
  50                         -MAX_MAP_GENERATION_LIMIT, -MAX_MAP_GENERATION_LIMIT);
  51         b->max_pos         = v3s16(MAX_MAP_GENERATION_LIMIT,
  52                         MAX_MAP_GENERATION_LIMIT, MAX_MAP_GENERATION_LIMIT);
  53         b->heat_point      = 0.0;
  54         b->humidity_point  = 0.0;
  55         b->vertical_blend  = 0;
  56
  57         b->m_nodenames.emplace_back("mapgen_stone");
  58         b->m_nodenames.emplace_back("mapgen_stone");
  59         b->m_nodenames.emplace_back("mapgen_stone");
  60         b->m_nodenames.emplace_back("mapgen_water_source");
  61         b->m_nodenames.emplace_back("mapgen_water_source");
  62         b->m_nodenames.emplace_back("mapgen_river_water_source");
  63         b->m_nodenames.emplace_back("mapgen_stone");
  64         b->m_nodenames.emplace_back("ignore");
  65         b->m_nodenames.emplace_back("ignore");
  66         b->m_nodenames.emplace_back("ignore");
  67         b->m_nodenames.emplace_back("ignore");
  68         b->m_nodenames.emplace_back("ignore");
  69         m_ndef->pendNodeResolve(b);
  70
  71         add(b);
  72 }
  73
  74
  75 void BiomeManager::clear()
  76 {
  77         EmergeManager *emerge = m_server->getEmergeManager();
  78
  79         // Remove all dangling references in Decorations
  80         DecorationManager *decomgr = emerge->decomgr;
  81         for (size_t i = 0; i != decomgr->getNumObjects(); i++) {
  82                 Decoration *deco = (Decoration *)decomgr->getRaw(i);
  83                 deco->biomes.clear();
  84         }
  85
  86         // Don't delete the first biome
  87         for (size_t i = 1; i < m_objects.size(); i++)
  88                 delete (Biome *)m_objects[i];
  89
  90         m_objects.resize(1);
  91 }
  92
  93
  94 // For BiomeGen type 'BiomeGenOriginal'
  95 float BiomeManager::getHeatAtPosOriginal(v3s16 pos, NoiseParams &np_heat,
  96         NoiseParams &np_heat_blend, u64 seed)
  97 {
  98         return
  99                 NoisePerlin2D(&np_heat,       pos.X, pos.Z, seed) +
 100                 NoisePerlin2D(&np_heat_blend, pos.X, pos.Z, seed);
 101 }
 102
 103
 104 // For BiomeGen type 'BiomeGenOriginal'
 105 float BiomeManager::getHumidityAtPosOriginal(v3s16 pos, NoiseParams &np_humidity,
 106         NoiseParams &np_humidity_blend, u64 seed)
 107 {
 108         return
 109                 NoisePerlin2D(&np_humidity,       pos.X, pos.Z, seed) +
 110                 NoisePerlin2D(&np_humidity_blend, pos.X, pos.Z, seed);
 111 }
 112
 113
 114 // For BiomeGen type 'BiomeGenOriginal'
 115 Biome *BiomeManager::getBiomeFromNoiseOriginal(float heat, float humidity, v3s16 pos)
 116 {
 117         Biome *biome_closest = nullptr;
 118         Biome *biome_closest_blend = nullptr;
 119         float dist_min = FLT_MAX;
 120         float dist_min_blend = FLT_MAX;
 121
 122         for (size_t i = 1; i < getNumObjects(); i++) {
 123                 Biome *b = (Biome *)getRaw(i);
 124                 if (!b ||
 125                                 pos.Y < b->min_pos.Y || pos.Y > b->max_pos.Y + b->vertical_blend ||
 126                                 pos.X < b->min_pos.X || pos.X > b->max_pos.X ||
 127                                 pos.Z < b->min_pos.Z || pos.Z > b->max_pos.Z)
 128                         continue;
 129
 130                 float d_heat = heat - b->heat_point;
 131                 float d_humidity = humidity - b->humidity_point;
 132                 float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 133
 134                 if (pos.Y <= b->max_pos.Y) { // Within y limits of biome b
 135                         if (dist < dist_min) {
 136                                 dist_min = dist;
 137                                 biome_closest = b;
 138                         }
 139                 } else if (dist < dist_min_blend) { // Blend area above biome b
 140                         dist_min_blend = dist;
 141                         biome_closest_blend = b;
 142                 }
 143         }
 144
 145         mysrand(pos.Y + (heat + humidity) * 0.9f);
 146         if (biome_closest_blend && dist_min_blend <= dist_min &&
 147                         myrand_range(0, biome_closest_blend->vertical_blend) >=
 148                         pos.Y - biome_closest_blend->max_pos.Y)
 149                 return biome_closest_blend;
 150
 151         return (biome_closest) ? biome_closest : (Biome *)getRaw(BIOME_NONE);
 152 }
 153
 154
 155 ////////////////////////////////////////////////////////////////////////////////
 156
 157 void BiomeParamsOriginal::readParams(const Settings *settings)
 158 {
 159         settings->getNoiseParams("mg_biome_np_heat",           np_heat);
 160         settings->getNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
 161         settings->getNoiseParams("mg_biome_np_humidity",       np_humidity);
 162         settings->getNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
 163 }
 164
 165
 166 void BiomeParamsOriginal::writeParams(Settings *settings) const
 167 {
 168         settings->setNoiseParams("mg_biome_np_heat",           np_heat);
 169         settings->setNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
 170         settings->setNoiseParams("mg_biome_np_humidity",       np_humidity);
 171         settings->setNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
 172 }
 173
 174
 175 ////////////////////////////////////////////////////////////////////////////////
 176
 177 BiomeGenOriginal::BiomeGenOriginal(BiomeManager *biomemgr,
 178         BiomeParamsOriginal *params, v3s16 chunksize)
 179 {
 180         m_bmgr   = biomemgr;
 181         m_params = params;
 182         m_csize  = chunksize;
 183
 184         noise_heat           = new Noise(&params->np_heat,
 185                                                                         params->seed, m_csize.X, m_csize.Z);
 186         noise_humidity       = new Noise(&params->np_humidity,
 187                                                                         params->seed, m_csize.X, m_csize.Z);
 188         noise_heat_blend     = new Noise(&params->np_heat_blend,
 189                                                                         params->seed, m_csize.X, m_csize.Z);
 190         noise_humidity_blend = new Noise(&params->np_humidity_blend,
 191                                                                         params->seed, m_csize.X, m_csize.Z);
 192
 193         heatmap  = noise_heat->result;
 194         humidmap = noise_humidity->result;
 195
 196         biomemap = new biome_t[m_csize.X * m_csize.Z];
 197         // Initialise with the ID of 'BIOME_NONE' so that cavegen can get the
 198         // fallback biome when biome generation (which calculates the biomemap IDs)
 199         // is disabled.
 200         memset(biomemap, 0, sizeof(biome_t) * m_csize.X * m_csize.Z);
 201 }
 202
 203 BiomeGenOriginal::~BiomeGenOriginal()
 204 {
 205         delete []biomemap;
 206
 207         delete noise_heat;
 208         delete noise_humidity;
 209         delete noise_heat_blend;
 210         delete noise_humidity_blend;
 211 }
 212
 213 // Only usable in a mapgen thread
 214 Biome *BiomeGenOriginal::calcBiomeAtPoint(v3s16 pos) const
 215 {
 216         float heat =
 217                 NoisePerlin2D(&m_params->np_heat,       pos.X, pos.Z, m_params->seed) +
 218                 NoisePerlin2D(&m_params->np_heat_blend, pos.X, pos.Z, m_params->seed);
 219         float humidity =
 220                 NoisePerlin2D(&m_params->np_humidity,       pos.X, pos.Z, m_params->seed) +
 221                 NoisePerlin2D(&m_params->np_humidity_blend, pos.X, pos.Z, m_params->seed);
 222
 223         return calcBiomeFromNoise(heat, humidity, pos);
 224 }
 225
 226
 227 void BiomeGenOriginal::calcBiomeNoise(v3s16 pmin)
 228 {
 229         m_pmin = pmin;
 230
 231         noise_heat->perlinMap2D(pmin.X, pmin.Z);
 232         noise_humidity->perlinMap2D(pmin.X, pmin.Z);
 233         noise_heat_blend->perlinMap2D(pmin.X, pmin.Z);
 234         noise_humidity_blend->perlinMap2D(pmin.X, pmin.Z);
 235
 236         for (s32 i = 0; i < m_csize.X * m_csize.Z; i++) {
 237                 noise_heat->result[i]     += noise_heat_blend->result[i];
 238                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 239         }
 240 }
 241
 242
 243 biome_t *BiomeGenOriginal::getBiomes(s16 *heightmap, v3s16 pmin)
 244 {
 245         for (s16 zr = 0; zr < m_csize.Z; zr++)
 246         for (s16 xr = 0; xr < m_csize.X; xr++) {
 247                 s32 i = zr * m_csize.X + xr;
 248                 Biome *biome = calcBiomeFromNoise(
 249                         noise_heat->result[i],
 250                         noise_humidity->result[i],
 251                         v3s16(pmin.X + xr, heightmap[i], pmin.Z + zr));
 252
 253                 biomemap[i] = biome->index;
 254         }
 255
 256         return biomemap;
 257 }
 258
 259
 260 Biome *BiomeGenOriginal::getBiomeAtPoint(v3s16 pos) const
 261 {
 262         return getBiomeAtIndex(
 263                 (pos.Z - m_pmin.Z) * m_csize.X + (pos.X - m_pmin.X),
 264                 pos);
 265 }
 266
 267
 268 Biome *BiomeGenOriginal::getBiomeAtIndex(size_t index, v3s16 pos) const
 269 {
 270         return calcBiomeFromNoise(
 271                 noise_heat->result[index],
 272                 noise_humidity->result[index],
 273                 pos);
 274 }
 275
 276
 277 Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, v3s16 pos) const
 278 {
 279         Biome *biome_closest = nullptr;
 280         Biome *biome_closest_blend = nullptr;
 281         float dist_min = FLT_MAX;
 282         float dist_min_blend = FLT_MAX;
 283
 284         for (size_t i = 1; i < m_bmgr->getNumObjects(); i++) {
 285                 Biome *b = (Biome *)m_bmgr->getRaw(i);
 286                 if (!b ||
 287                                 pos.Y < b->min_pos.Y || pos.Y > b->max_pos.Y + b->vertical_blend ||
 288                                 pos.X < b->min_pos.X || pos.X > b->max_pos.X ||
 289                                 pos.Z < b->min_pos.Z || pos.Z > b->max_pos.Z)
 290                         continue;
 291
 292                 float d_heat = heat - b->heat_point;
 293                 float d_humidity = humidity - b->humidity_point;
 294                 float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 295
 296                 if (pos.Y <= b->max_pos.Y) { // Within y limits of biome b
 297                         if (dist < dist_min) {
 298                                 dist_min = dist;
 299                                 biome_closest = b;
 300                         }
 301                 } else if (dist < dist_min_blend) { // Blend area above biome b
 302                         dist_min_blend = dist;
 303                         biome_closest_blend = b;
 304                 }
 305         }
 306
 307         // Carefully tune pseudorandom seed variation to avoid single node dither
 308         // and create larger scale blending patterns similar to horizontal biome
 309         // blend.
 310         mysrand(pos.Y + (heat + humidity) * 0.9f);
 311
 312         if (biome_closest_blend && dist_min_blend <= dist_min &&
 313                         myrand_range(0, biome_closest_blend->vertical_blend) >=
 314                         pos.Y - biome_closest_blend->max_pos.Y)
 315                 return biome_closest_blend;
 316
 317         return (biome_closest) ? biome_closest : (Biome *)m_bmgr->getRaw(BIOME_NONE);
 318 }
 319
 320
 321 ////////////////////////////////////////////////////////////////////////////////
 322
 323 void Biome::resolveNodeNames()
 324 {
 325         getIdFromNrBacklog(&c_top,           "mapgen_stone",              CONTENT_AIR,    false);
 326         getIdFromNrBacklog(&c_filler,        "mapgen_stone",              CONTENT_AIR,    false);
 327         getIdFromNrBacklog(&c_stone,         "mapgen_stone",              CONTENT_AIR,    false);
 328         getIdFromNrBacklog(&c_water_top,     "mapgen_water_source",       CONTENT_AIR,    false);
 329         getIdFromNrBacklog(&c_water,         "mapgen_water_source",       CONTENT_AIR,    false);
 330         getIdFromNrBacklog(&c_river_water,   "mapgen_river_water_source", CONTENT_AIR,    false);
 331         getIdFromNrBacklog(&c_riverbed,      "mapgen_stone",              CONTENT_AIR,    false);
 332         getIdFromNrBacklog(&c_dust,          "ignore",                    CONTENT_IGNORE, false);
 333         getIdFromNrBacklog(&c_cave_liquid,   "ignore",                    CONTENT_IGNORE, false);
 334         getIdFromNrBacklog(&c_dungeon,       "ignore",                    CONTENT_IGNORE, false);
 335         getIdFromNrBacklog(&c_dungeon_alt,   "ignore",                    CONTENT_IGNORE, false);
 336         getIdFromNrBacklog(&c_dungeon_stair, "ignore",                    CONTENT_IGNORE, false);
 337 }