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         m_ndef->pendNodeResolve(b);
  66
  67         add(b);
  68 }
  69
  70
  71 void BiomeManager::clear()
  72 {
  73         EmergeManager *emerge = m_server->getEmergeManager();
  74
  75         // Remove all dangling references in Decorations
  76         DecorationManager *decomgr = emerge->decomgr;
  77         for (size_t i = 0; i != decomgr->getNumObjects(); i++) {
  78                 Decoration *deco = (Decoration *)decomgr->getRaw(i);
  79                 deco->biomes.clear();
  80         }
  81
  82         // Don't delete the first biome
  83         for (size_t i = 1; i < m_objects.size(); i++)
  84                 delete (Biome *)m_objects[i];
  85
  86         m_objects.resize(1);
  87 }
  88
  89
  90 // For BiomeGen type 'BiomeGenOriginal'
  91 float BiomeManager::getHeatAtPosOriginal(v3s16 pos, NoiseParams &np_heat,
  92         NoiseParams &np_heat_blend, u64 seed)
  93 {
  94         return
  95                 NoisePerlin2D(&np_heat,       pos.X, pos.Z, seed) +
  96                 NoisePerlin2D(&np_heat_blend, pos.X, pos.Z, seed);
  97 }
  98
  99
 100 // For BiomeGen type 'BiomeGenOriginal'
 101 float BiomeManager::getHumidityAtPosOriginal(v3s16 pos, NoiseParams &np_humidity,
 102         NoiseParams &np_humidity_blend, u64 seed)
 103 {
 104         return
 105                 NoisePerlin2D(&np_humidity,       pos.X, pos.Z, seed) +
 106                 NoisePerlin2D(&np_humidity_blend, pos.X, pos.Z, seed);
 107 }
 108
 109
 110 // For BiomeGen type 'BiomeGenOriginal'
 111 Biome *BiomeManager::getBiomeFromNoiseOriginal(float heat, float humidity, v3s16 pos)
 112 {
 113         Biome *biome_closest = nullptr;
 114         Biome *biome_closest_blend = nullptr;
 115         float dist_min = FLT_MAX;
 116         float dist_min_blend = FLT_MAX;
 117
 118         for (size_t i = 1; i < getNumObjects(); i++) {
 119                 Biome *b = (Biome *)getRaw(i);
 120                 if (!b ||
 121                                 pos.Y < b->min_pos.Y || pos.Y > b->max_pos.Y + b->vertical_blend ||
 122                                 pos.X < b->min_pos.X || pos.X > b->max_pos.X ||
 123                                 pos.Z < b->min_pos.Z || pos.Z > b->max_pos.Z)
 124                         continue;
 125
 126                 float d_heat = heat - b->heat_point;
 127                 float d_humidity = humidity - b->humidity_point;
 128                 float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 129
 130                 if (pos.Y <= b->max_pos.Y) { // Within y limits of biome b
 131                         if (dist < dist_min) {
 132                                 dist_min = dist;
 133                                 biome_closest = b;
 134                         }
 135                 } else if (dist < dist_min_blend) { // Blend area above biome b
 136                         dist_min_blend = dist;
 137                         biome_closest_blend = b;
 138                 }
 139         }
 140
 141         mysrand(pos.Y + (heat + humidity) / 2);
 142         if (biome_closest_blend && dist_min_blend <= dist_min &&
 143                         myrand_range(0, biome_closest_blend->vertical_blend) >=
 144                         pos.Y - biome_closest_blend->max_pos.Y)
 145                 return biome_closest_blend;
 146
 147         return (biome_closest) ? biome_closest : (Biome *)getRaw(BIOME_NONE);
 148 }
 149
 150
 151 ////////////////////////////////////////////////////////////////////////////////
 152
 153 void BiomeParamsOriginal::readParams(const Settings *settings)
 154 {
 155         settings->getNoiseParams("mg_biome_np_heat",           np_heat);
 156         settings->getNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
 157         settings->getNoiseParams("mg_biome_np_humidity",       np_humidity);
 158         settings->getNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
 159 }
 160
 161
 162 void BiomeParamsOriginal::writeParams(Settings *settings) const
 163 {
 164         settings->setNoiseParams("mg_biome_np_heat",           np_heat);
 165         settings->setNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
 166         settings->setNoiseParams("mg_biome_np_humidity",       np_humidity);
 167         settings->setNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
 168 }
 169
 170
 171 ////////////////////////////////////////////////////////////////////////////////
 172
 173 BiomeGenOriginal::BiomeGenOriginal(BiomeManager *biomemgr,
 174         BiomeParamsOriginal *params, v3s16 chunksize)
 175 {
 176         m_bmgr   = biomemgr;
 177         m_params = params;
 178         m_csize  = chunksize;
 179
 180         noise_heat           = new Noise(&params->np_heat,
 181                                                                         params->seed, m_csize.X, m_csize.Z);
 182         noise_humidity       = new Noise(&params->np_humidity,
 183                                                                         params->seed, m_csize.X, m_csize.Z);
 184         noise_heat_blend     = new Noise(&params->np_heat_blend,
 185                                                                         params->seed, m_csize.X, m_csize.Z);
 186         noise_humidity_blend = new Noise(&params->np_humidity_blend,
 187                                                                         params->seed, m_csize.X, m_csize.Z);
 188
 189         heatmap  = noise_heat->result;
 190         humidmap = noise_humidity->result;
 191         biomemap = new biome_t[m_csize.X * m_csize.Z];
 192 }
 193
 194 BiomeGenOriginal::~BiomeGenOriginal()
 195 {
 196         delete []biomemap;
 197
 198         delete noise_heat;
 199         delete noise_humidity;
 200         delete noise_heat_blend;
 201         delete noise_humidity_blend;
 202 }
 203
 204 // Only usable in a mapgen thread
 205 Biome *BiomeGenOriginal::calcBiomeAtPoint(v3s16 pos) const
 206 {
 207         float heat =
 208                 NoisePerlin2D(&m_params->np_heat,       pos.X, pos.Z, m_params->seed) +
 209                 NoisePerlin2D(&m_params->np_heat_blend, pos.X, pos.Z, m_params->seed);
 210         float humidity =
 211                 NoisePerlin2D(&m_params->np_humidity,       pos.X, pos.Z, m_params->seed) +
 212                 NoisePerlin2D(&m_params->np_humidity_blend, pos.X, pos.Z, m_params->seed);
 213
 214         return calcBiomeFromNoise(heat, humidity, pos);
 215 }
 216
 217
 218 void BiomeGenOriginal::calcBiomeNoise(v3s16 pmin)
 219 {
 220         m_pmin = pmin;
 221
 222         noise_heat->perlinMap2D(pmin.X, pmin.Z);
 223         noise_humidity->perlinMap2D(pmin.X, pmin.Z);
 224         noise_heat_blend->perlinMap2D(pmin.X, pmin.Z);
 225         noise_humidity_blend->perlinMap2D(pmin.X, pmin.Z);
 226
 227         for (s32 i = 0; i < m_csize.X * m_csize.Z; i++) {
 228                 noise_heat->result[i]     += noise_heat_blend->result[i];
 229                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 230         }
 231 }
 232
 233
 234 biome_t *BiomeGenOriginal::getBiomes(s16 *heightmap, v3s16 pmin)
 235 {
 236         for (s16 zr = 0; zr < m_csize.Z; zr++)
 237         for (s16 xr = 0; xr < m_csize.X; xr++) {
 238                 s32 i = zr * m_csize.X + xr;
 239                 Biome *biome = calcBiomeFromNoise(
 240                         noise_heat->result[i],
 241                         noise_humidity->result[i],
 242                         v3s16(pmin.X + xr, heightmap[i], pmin.Z + zr));
 243
 244                 biomemap[i] = biome->index;
 245         }
 246
 247         return biomemap;
 248 }
 249
 250
 251 Biome *BiomeGenOriginal::getBiomeAtPoint(v3s16 pos) const
 252 {
 253         return getBiomeAtIndex(
 254                 (pos.Z - m_pmin.Z) * m_csize.X + (pos.X - m_pmin.X),
 255                 pos);
 256 }
 257
 258
 259 Biome *BiomeGenOriginal::getBiomeAtIndex(size_t index, v3s16 pos) const
 260 {
 261         return calcBiomeFromNoise(
 262                 noise_heat->result[index],
 263                 noise_humidity->result[index],
 264                 pos);
 265 }
 266
 267
 268 Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, v3s16 pos) const
 269 {
 270         Biome *biome_closest = nullptr;
 271         Biome *biome_closest_blend = nullptr;
 272         float dist_min = FLT_MAX;
 273         float dist_min_blend = FLT_MAX;
 274
 275         for (size_t i = 1; i < m_bmgr->getNumObjects(); i++) {
 276                 Biome *b = (Biome *)m_bmgr->getRaw(i);
 277                 if (!b ||
 278                                 pos.Y < b->min_pos.Y || pos.Y > b->max_pos.Y + b->vertical_blend ||
 279                                 pos.X < b->min_pos.X || pos.X > b->max_pos.X ||
 280                                 pos.Z < b->min_pos.Z || pos.Z > b->max_pos.Z)
 281                         continue;
 282
 283                 float d_heat = heat - b->heat_point;
 284                 float d_humidity = humidity - b->humidity_point;
 285                 float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 286
 287                 if (pos.Y <= b->max_pos.Y) { // Within y limits of biome b
 288                         if (dist < dist_min) {
 289                                 dist_min = dist;
 290                                 biome_closest = b;
 291                         }
 292                 } else if (dist < dist_min_blend) { // Blend area above biome b
 293                         dist_min_blend = dist;
 294                         biome_closest_blend = b;
 295                 }
 296         }
 297
 298         // Carefully tune pseudorandom seed variation to avoid single node dither
 299         // and create larger scale blending patterns similar to horizontal biome
 300         // blend.
 301         mysrand(pos.Y + (heat + humidity) / 2);
 302
 303         if (biome_closest_blend && dist_min_blend <= dist_min &&
 304                         myrand_range(0, biome_closest_blend->vertical_blend) >=
 305                         pos.Y - biome_closest_blend->max_pos.Y)
 306                 return biome_closest_blend;
 307
 308         return (biome_closest) ? biome_closest : (Biome *)m_bmgr->getRaw(BIOME_NONE);
 309 }
 310
 311
 312 ////////////////////////////////////////////////////////////////////////////////
 313
 314 void Biome::resolveNodeNames()
 315 {
 316         getIdFromNrBacklog(&c_top,         "mapgen_stone",              CONTENT_AIR);
 317         getIdFromNrBacklog(&c_filler,      "mapgen_stone",              CONTENT_AIR);
 318         getIdFromNrBacklog(&c_stone,       "mapgen_stone",              CONTENT_AIR);
 319         getIdFromNrBacklog(&c_water_top,   "mapgen_water_source",       CONTENT_AIR);
 320         getIdFromNrBacklog(&c_water,       "mapgen_water_source",       CONTENT_AIR);
 321         getIdFromNrBacklog(&c_river_water, "mapgen_river_water_source", CONTENT_AIR);
 322         getIdFromNrBacklog(&c_riverbed,    "mapgen_stone",              CONTENT_AIR);
 323         getIdFromNrBacklog(&c_dust,        "ignore",                    CONTENT_IGNORE);
 324 }