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