src/mapgen/mg_biome.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2014-2016 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2014-2017 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->y_min           = -MAX_MAP_GENERATION_LIMIT;
  50         b->y_max           = MAX_MAP_GENERATION_LIMIT;
  51         b->heat_point      = 0.0;
  52         b->humidity_point  = 0.0;
  53         b->vertical_blend  = 0;
  54
  55         b->m_nodenames.emplace_back("mapgen_stone");
  56         b->m_nodenames.emplace_back("mapgen_stone");
  57         b->m_nodenames.emplace_back("mapgen_stone");
  58         b->m_nodenames.emplace_back("mapgen_water_source");
  59         b->m_nodenames.emplace_back("mapgen_water_source");
  60         b->m_nodenames.emplace_back("mapgen_river_water_source");
  61         b->m_nodenames.emplace_back("mapgen_stone");
  62         b->m_nodenames.emplace_back("ignore");
  63         m_ndef->pendNodeResolve(b);
  64
  65         add(b);
  66 }
  67
  68
  69 void BiomeManager::clear()
  70 {
  71         EmergeManager *emerge = m_server->getEmergeManager();
  72
  73         // Remove all dangling references in Decorations
  74         DecorationManager *decomgr = emerge->decomgr;
  75         for (size_t i = 0; i != decomgr->getNumObjects(); i++) {
  76                 Decoration *deco = (Decoration *)decomgr->getRaw(i);
  77                 deco->biomes.clear();
  78         }
  79
  80         // Don't delete the first biome
  81         for (size_t i = 1; i < m_objects.size(); i++)
  82                 delete (Biome *)m_objects[i];
  83
  84         m_objects.resize(1);
  85 }
  86
  87 ////////////////////////////////////////////////////////////////////////////////
  88
  89
  90 void BiomeParamsOriginal::readParams(const Settings *settings)
  91 {
  92         settings->getNoiseParams("mg_biome_np_heat",           np_heat);
  93         settings->getNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
  94         settings->getNoiseParams("mg_biome_np_humidity",       np_humidity);
  95         settings->getNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
  96 }
  97
  98
  99 void BiomeParamsOriginal::writeParams(Settings *settings) const
 100 {
 101         settings->setNoiseParams("mg_biome_np_heat",           np_heat);
 102         settings->setNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
 103         settings->setNoiseParams("mg_biome_np_humidity",       np_humidity);
 104         settings->setNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
 105 }
 106
 107
 108 ////////////////////////////////////////////////////////////////////////////////
 109
 110 BiomeGenOriginal::BiomeGenOriginal(BiomeManager *biomemgr,
 111         BiomeParamsOriginal *params, v3s16 chunksize)
 112 {
 113         m_bmgr   = biomemgr;
 114         m_params = params;
 115         m_csize  = chunksize;
 116
 117         noise_heat           = new Noise(&params->np_heat,
 118                                                                         params->seed, m_csize.X, m_csize.Z);
 119         noise_humidity       = new Noise(&params->np_humidity,
 120                                                                         params->seed, m_csize.X, m_csize.Z);
 121         noise_heat_blend     = new Noise(&params->np_heat_blend,
 122                                                                         params->seed, m_csize.X, m_csize.Z);
 123         noise_humidity_blend = new Noise(&params->np_humidity_blend,
 124                                                                         params->seed, m_csize.X, m_csize.Z);
 125
 126         heatmap  = noise_heat->result;
 127         humidmap = noise_humidity->result;
 128         biomemap = new biome_t[m_csize.X * m_csize.Z];
 129 }
 130
 131 BiomeGenOriginal::~BiomeGenOriginal()
 132 {
 133         delete []biomemap;
 134
 135         delete noise_heat;
 136         delete noise_humidity;
 137         delete noise_heat_blend;
 138         delete noise_humidity_blend;
 139 }
 140
 141
 142 Biome *BiomeGenOriginal::calcBiomeAtPoint(v3s16 pos) const
 143 {
 144         float heat =
 145                 NoisePerlin2D(&m_params->np_heat,       pos.X, pos.Z, m_params->seed) +
 146                 NoisePerlin2D(&m_params->np_heat_blend, pos.X, pos.Z, m_params->seed);
 147         float humidity =
 148                 NoisePerlin2D(&m_params->np_humidity,       pos.X, pos.Z, m_params->seed) +
 149                 NoisePerlin2D(&m_params->np_humidity_blend, pos.X, pos.Z, m_params->seed);
 150
 151         return calcBiomeFromNoise(heat, humidity, pos.Y);
 152 }
 153
 154
 155 void BiomeGenOriginal::calcBiomeNoise(v3s16 pmin)
 156 {
 157         m_pmin = pmin;
 158
 159         noise_heat->perlinMap2D(pmin.X, pmin.Z);
 160         noise_humidity->perlinMap2D(pmin.X, pmin.Z);
 161         noise_heat_blend->perlinMap2D(pmin.X, pmin.Z);
 162         noise_humidity_blend->perlinMap2D(pmin.X, pmin.Z);
 163
 164         for (s32 i = 0; i < m_csize.X * m_csize.Z; i++) {
 165                 noise_heat->result[i]     += noise_heat_blend->result[i];
 166                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 167         }
 168 }
 169
 170
 171 biome_t *BiomeGenOriginal::getBiomes(s16 *heightmap)
 172 {
 173         for (s32 i = 0; i != m_csize.X * m_csize.Z; i++) {
 174                 Biome *biome = calcBiomeFromNoise(
 175                         noise_heat->result[i],
 176                         noise_humidity->result[i],
 177                         heightmap[i]);
 178
 179                 biomemap[i] = biome->index;
 180         }
 181
 182         return biomemap;
 183 }
 184
 185
 186 Biome *BiomeGenOriginal::getBiomeAtPoint(v3s16 pos) const
 187 {
 188         return getBiomeAtIndex(
 189                 (pos.Z - m_pmin.Z) * m_csize.X + (pos.X - m_pmin.X),
 190                 pos.Y);
 191 }
 192
 193
 194 Biome *BiomeGenOriginal::getBiomeAtIndex(size_t index, s16 y) const
 195 {
 196         return calcBiomeFromNoise(
 197                 noise_heat->result[index],
 198                 noise_humidity->result[index],
 199                 y);
 200 }
 201
 202
 203 Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, s16 y) const
 204 {
 205         Biome *biome_closest = nullptr;
 206         Biome *biome_closest_blend = nullptr;
 207         float dist_min = FLT_MAX;
 208         float dist_min_blend = FLT_MAX;
 209
 210         for (size_t i = 1; i < m_bmgr->getNumObjects(); i++) {
 211                 Biome *b = (Biome *)m_bmgr->getRaw(i);
 212                 if (!b || y > b->y_max + b->vertical_blend || y < b->y_min)
 213                         continue;
 214
 215                 float d_heat = heat - b->heat_point;
 216                 float d_humidity = humidity - b->humidity_point;
 217                 float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 218
 219                 if (y <= b->y_max) { // Within y limits of biome b
 220                         if (dist < dist_min) {
 221                                 dist_min = dist;
 222                                 biome_closest = b;
 223                         }
 224                 } else if (dist < dist_min_blend) { // Blend area above biome b
 225                         dist_min_blend = dist;
 226                         biome_closest_blend = b;
 227                 }
 228         }
 229
 230         // Carefully tune pseudorandom seed variation to avoid single node dither
 231         // and create larger scale blending patterns.
 232         mysrand(y + (heat - humidity) * 2);
 233
 234         if (biome_closest_blend &&
 235                         myrand_range(0, biome_closest_blend->vertical_blend) >=
 236                         y - biome_closest_blend->y_max)
 237                 return biome_closest_blend;
 238
 239         return (biome_closest) ? biome_closest : (Biome *)m_bmgr->getRaw(BIOME_NONE);
 240 }
 241
 242
 243 ////////////////////////////////////////////////////////////////////////////////
 244
 245 void Biome::resolveNodeNames()
 246 {
 247         getIdFromNrBacklog(&c_top,         "mapgen_stone",              CONTENT_AIR);
 248         getIdFromNrBacklog(&c_filler,      "mapgen_stone",              CONTENT_AIR);
 249         getIdFromNrBacklog(&c_stone,       "mapgen_stone",              CONTENT_AIR);
 250         getIdFromNrBacklog(&c_water_top,   "mapgen_water_source",       CONTENT_AIR);
 251         getIdFromNrBacklog(&c_water,       "mapgen_water_source",       CONTENT_AIR);
 252         getIdFromNrBacklog(&c_river_water, "mapgen_river_water_source", CONTENT_AIR);
 253         getIdFromNrBacklog(&c_riverbed,    "mapgen_stone",              CONTENT_AIR);
 254         getIdFromNrBacklog(&c_dust,        "ignore",                    CONTENT_IGNORE);
 255 }