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_nnlistsizes.push_back(1);
  67         b->m_nodenames.emplace_back("ignore");
  68         b->m_nodenames.emplace_back("ignore");
  69         b->m_nodenames.emplace_back("ignore");
  70         m_ndef->pendNodeResolve(b);
  71
  72         add(b);
  73 }
  74
  75
  76 void BiomeManager::clear()
  77 {
  78         EmergeManager *emerge = m_server->getEmergeManager();
  79
  80         // Remove all dangling references in Decorations
  81         DecorationManager *decomgr = emerge->decomgr;
  82         for (size_t i = 0; i != decomgr->getNumObjects(); i++) {
  83                 Decoration *deco = (Decoration *)decomgr->getRaw(i);
  84                 deco->biomes.clear();
  85         }
  86
  87         // Don't delete the first biome
  88         for (size_t i = 1; i < m_objects.size(); i++)
  89                 delete (Biome *)m_objects[i];
  90
  91         m_objects.resize(1);
  92 }
  93
  94
  95 // For BiomeGen type 'BiomeGenOriginal'
  96 float BiomeManager::getHeatAtPosOriginal(v3s16 pos, NoiseParams &np_heat,
  97         NoiseParams &np_heat_blend, u64 seed)
  98 {
  99         return
 100                 NoisePerlin2D(&np_heat,       pos.X, pos.Z, seed) +
 101                 NoisePerlin2D(&np_heat_blend, pos.X, pos.Z, seed);
 102 }
 103
 104
 105 // For BiomeGen type 'BiomeGenOriginal'
 106 float BiomeManager::getHumidityAtPosOriginal(v3s16 pos, NoiseParams &np_humidity,
 107         NoiseParams &np_humidity_blend, u64 seed)
 108 {
 109         return
 110                 NoisePerlin2D(&np_humidity,       pos.X, pos.Z, seed) +
 111                 NoisePerlin2D(&np_humidity_blend, pos.X, pos.Z, seed);
 112 }
 113
 114
 115 // For BiomeGen type 'BiomeGenOriginal'
 116 Biome *BiomeManager::getBiomeFromNoiseOriginal(float heat, float humidity, v3s16 pos)
 117 {
 118         Biome *biome_closest = nullptr;
 119         Biome *biome_closest_blend = nullptr;
 120         float dist_min = FLT_MAX;
 121         float dist_min_blend = FLT_MAX;
 122
 123         for (size_t i = 1; i < getNumObjects(); i++) {
 124                 Biome *b = (Biome *)getRaw(i);
 125                 if (!b ||
 126                                 pos.Y < b->min_pos.Y || pos.Y > b->max_pos.Y + b->vertical_blend ||
 127                                 pos.X < b->min_pos.X || pos.X > b->max_pos.X ||
 128                                 pos.Z < b->min_pos.Z || pos.Z > b->max_pos.Z)
 129                         continue;
 130
 131                 float d_heat = heat - b->heat_point;
 132                 float d_humidity = humidity - b->humidity_point;
 133                 float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 134
 135                 if (pos.Y <= b->max_pos.Y) { // Within y limits of biome b
 136                         if (dist < dist_min) {
 137                                 dist_min = dist;
 138                                 biome_closest = b;
 139                         }
 140                 } else if (dist < dist_min_blend) { // Blend area above biome b
 141                         dist_min_blend = dist;
 142                         biome_closest_blend = b;
 143                 }
 144         }
 145
 146         mysrand(pos.Y + (heat + humidity) * 0.9f);
 147         if (biome_closest_blend && dist_min_blend <= dist_min &&
 148                         myrand_range(0, biome_closest_blend->vertical_blend) >=
 149                         pos.Y - biome_closest_blend->max_pos.Y)
 150                 return biome_closest_blend;
 151
 152         return (biome_closest) ? biome_closest : (Biome *)getRaw(BIOME_NONE);
 153 }
 154
 155
 156 ////////////////////////////////////////////////////////////////////////////////
 157
 158 void BiomeParamsOriginal::readParams(const Settings *settings)
 159 {
 160         settings->getNoiseParams("mg_biome_np_heat",           np_heat);
 161         settings->getNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
 162         settings->getNoiseParams("mg_biome_np_humidity",       np_humidity);
 163         settings->getNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
 164 }
 165
 166
 167 void BiomeParamsOriginal::writeParams(Settings *settings) const
 168 {
 169         settings->setNoiseParams("mg_biome_np_heat",           np_heat);
 170         settings->setNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
 171         settings->setNoiseParams("mg_biome_np_humidity",       np_humidity);
 172         settings->setNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
 173 }
 174
 175
 176 ////////////////////////////////////////////////////////////////////////////////
 177
 178 BiomeGenOriginal::BiomeGenOriginal(BiomeManager *biomemgr,
 179         BiomeParamsOriginal *params, v3s16 chunksize)
 180 {
 181         m_bmgr   = biomemgr;
 182         m_params = params;
 183         m_csize  = chunksize;
 184
 185         noise_heat           = new Noise(&params->np_heat,
 186                                                                         params->seed, m_csize.X, m_csize.Z);
 187         noise_humidity       = new Noise(&params->np_humidity,
 188                                                                         params->seed, m_csize.X, m_csize.Z);
 189         noise_heat_blend     = new Noise(&params->np_heat_blend,
 190                                                                         params->seed, m_csize.X, m_csize.Z);
 191         noise_humidity_blend = new Noise(&params->np_humidity_blend,
 192                                                                         params->seed, m_csize.X, m_csize.Z);
 193
 194         heatmap  = noise_heat->result;
 195         humidmap = noise_humidity->result;
 196
 197         biomemap = new biome_t[m_csize.X * m_csize.Z];
 198         // Initialise with the ID of 'BIOME_NONE' so that cavegen can get the
 199         // fallback biome when biome generation (which calculates the biomemap IDs)
 200         // is disabled.
 201         memset(biomemap, 0, sizeof(biome_t) * m_csize.X * m_csize.Z);
 202 }
 203
 204 BiomeGenOriginal::~BiomeGenOriginal()
 205 {
 206         delete []biomemap;
 207
 208         delete noise_heat;
 209         delete noise_humidity;
 210         delete noise_heat_blend;
 211         delete noise_humidity_blend;
 212 }
 213
 214 // Only usable in a mapgen thread
 215 Biome *BiomeGenOriginal::calcBiomeAtPoint(v3s16 pos) const
 216 {
 217         float heat =
 218                 NoisePerlin2D(&m_params->np_heat,       pos.X, pos.Z, m_params->seed) +
 219                 NoisePerlin2D(&m_params->np_heat_blend, pos.X, pos.Z, m_params->seed);
 220         float humidity =
 221                 NoisePerlin2D(&m_params->np_humidity,       pos.X, pos.Z, m_params->seed) +
 222                 NoisePerlin2D(&m_params->np_humidity_blend, pos.X, pos.Z, m_params->seed);
 223
 224         return calcBiomeFromNoise(heat, humidity, pos);
 225 }
 226
 227
 228 void BiomeGenOriginal::calcBiomeNoise(v3s16 pmin)
 229 {
 230         m_pmin = pmin;
 231
 232         noise_heat->perlinMap2D(pmin.X, pmin.Z);
 233         noise_humidity->perlinMap2D(pmin.X, pmin.Z);
 234         noise_heat_blend->perlinMap2D(pmin.X, pmin.Z);
 235         noise_humidity_blend->perlinMap2D(pmin.X, pmin.Z);
 236
 237         for (s32 i = 0; i < m_csize.X * m_csize.Z; i++) {
 238                 noise_heat->result[i]     += noise_heat_blend->result[i];
 239                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 240         }
 241 }
 242
 243
 244 biome_t *BiomeGenOriginal::getBiomes(s16 *heightmap, v3s16 pmin)
 245 {
 246         for (s16 zr = 0; zr < m_csize.Z; zr++)
 247         for (s16 xr = 0; xr < m_csize.X; xr++) {
 248                 s32 i = zr * m_csize.X + xr;
 249                 Biome *biome = calcBiomeFromNoise(
 250                         noise_heat->result[i],
 251                         noise_humidity->result[i],
 252                         v3s16(pmin.X + xr, heightmap[i], pmin.Z + zr));
 253
 254                 biomemap[i] = biome->index;
 255         }
 256
 257         return biomemap;
 258 }
 259
 260
 261 Biome *BiomeGenOriginal::getBiomeAtPoint(v3s16 pos) const
 262 {
 263         return getBiomeAtIndex(
 264                 (pos.Z - m_pmin.Z) * m_csize.X + (pos.X - m_pmin.X),
 265                 pos);
 266 }
 267
 268
 269 Biome *BiomeGenOriginal::getBiomeAtIndex(size_t index, v3s16 pos) const
 270 {
 271         return calcBiomeFromNoise(
 272                 noise_heat->result[index],
 273                 noise_humidity->result[index],
 274                 pos);
 275 }
 276
 277
 278 Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, v3s16 pos) const
 279 {
 280         Biome *biome_closest = nullptr;
 281         Biome *biome_closest_blend = nullptr;
 282         float dist_min = FLT_MAX;
 283         float dist_min_blend = FLT_MAX;
 284
 285         for (size_t i = 1; i < m_bmgr->getNumObjects(); i++) {
 286                 Biome *b = (Biome *)m_bmgr->getRaw(i);
 287                 if (!b ||
 288                                 pos.Y < b->min_pos.Y || pos.Y > b->max_pos.Y + b->vertical_blend ||
 289                                 pos.X < b->min_pos.X || pos.X > b->max_pos.X ||
 290                                 pos.Z < b->min_pos.Z || pos.Z > b->max_pos.Z)
 291                         continue;
 292
 293                 float d_heat = heat - b->heat_point;
 294                 float d_humidity = humidity - b->humidity_point;
 295                 float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 296
 297                 if (pos.Y <= b->max_pos.Y) { // Within y limits of biome b
 298                         if (dist < dist_min) {
 299                                 dist_min = dist;
 300                                 biome_closest = b;
 301                         }
 302                 } else if (dist < dist_min_blend) { // Blend area above biome b
 303                         dist_min_blend = dist;
 304                         biome_closest_blend = b;
 305                 }
 306         }
 307
 308         // Carefully tune pseudorandom seed variation to avoid single node dither
 309         // and create larger scale blending patterns similar to horizontal biome
 310         // blend.
 311         mysrand(pos.Y + (heat + humidity) * 0.9f);
 312
 313         if (biome_closest_blend && dist_min_blend <= dist_min &&
 314                         myrand_range(0, biome_closest_blend->vertical_blend) >=
 315                         pos.Y - biome_closest_blend->max_pos.Y)
 316                 return biome_closest_blend;
 317
 318         return (biome_closest) ? biome_closest : (Biome *)m_bmgr->getRaw(BIOME_NONE);
 319 }
 320
 321
 322 ////////////////////////////////////////////////////////////////////////////////
 323
 324 void Biome::resolveNodeNames()
 325 {
 326         getIdFromNrBacklog(&c_top,           "mapgen_stone",              CONTENT_AIR,    false);
 327         getIdFromNrBacklog(&c_filler,        "mapgen_stone",              CONTENT_AIR,    false);
 328         getIdFromNrBacklog(&c_stone,         "mapgen_stone",              CONTENT_AIR,    false);
 329         getIdFromNrBacklog(&c_water_top,     "mapgen_water_source",       CONTENT_AIR,    false);
 330         getIdFromNrBacklog(&c_water,         "mapgen_water_source",       CONTENT_AIR,    false);
 331         getIdFromNrBacklog(&c_river_water,   "mapgen_river_water_source", CONTENT_AIR,    false);
 332         getIdFromNrBacklog(&c_riverbed,      "mapgen_stone",              CONTENT_AIR,    false);
 333         getIdFromNrBacklog(&c_dust,          "ignore",                    CONTENT_IGNORE, false);
 334         getIdsFromNrBacklog(&c_cave_liquid);
 335         getIdFromNrBacklog(&c_dungeon,       "ignore",                    CONTENT_IGNORE, false);
 336         getIdFromNrBacklog(&c_dungeon_alt,   "ignore",                    CONTENT_IGNORE, false);
 337         getIdFromNrBacklog(&c_dungeon_stair, "ignore",                    CONTENT_IGNORE, false);
 338 }