src/mg_biome.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "mg_biome.h"
  21 #include "mg_decoration.h"
  22 #include "emerge.h"
  23 #include "server.h"
  24 #include "nodedef.h"
  25 #include "map.h" //for MMVManip
  26 #include "util/numeric.h"
  27 #include "porting.h"
  28 #include "settings.h"
  29
  30
  31 ///////////////////////////////////////////////////////////////////////////////
  32
  33
  34 BiomeManager::BiomeManager(Server *server) :
  35         ObjDefManager(server, OBJDEF_BIOME)
  36 {
  37         m_server = server;
  38
  39         // Create default biome to be used in case none exist
  40         Biome *b = new Biome;
  41
  42         b->name            = "Default";
  43         b->flags           = 0;
  44         b->depth_top       = 0;
  45         b->depth_filler    = -MAX_MAP_GENERATION_LIMIT;
  46         b->depth_water_top = 0;
  47         b->depth_riverbed  = 0;
  48         b->y_min           = -MAX_MAP_GENERATION_LIMIT;
  49         b->y_max           = MAX_MAP_GENERATION_LIMIT;
  50         b->heat_point      = 0.0;
  51         b->humidity_point  = 0.0;
  52
  53         b->m_nodenames.push_back("mapgen_stone");
  54         b->m_nodenames.push_back("mapgen_stone");
  55         b->m_nodenames.push_back("mapgen_stone");
  56         b->m_nodenames.push_back("mapgen_water_source");
  57         b->m_nodenames.push_back("mapgen_water_source");
  58         b->m_nodenames.push_back("mapgen_river_water_source");
  59         b->m_nodenames.push_back("mapgen_stone");
  60         b->m_nodenames.push_back("ignore");
  61         m_ndef->pendNodeResolve(b);
  62
  63         add(b);
  64 }
  65
  66
  67 BiomeManager::~BiomeManager()
  68 {
  69 }
  70
  71
  72 void BiomeManager::clear()
  73 {
  74         EmergeManager *emerge = m_server->getEmergeManager();
  75
  76         // Remove all dangling references in Decorations
  77         DecorationManager *decomgr = emerge->decomgr;
  78         for (size_t i = 0; i != decomgr->getNumObjects(); i++) {
  79                 Decoration *deco = (Decoration *)decomgr->getRaw(i);
  80                 deco->biomes.clear();
  81         }
  82
  83         // Don't delete the first biome
  84         for (size_t i = 1; i < m_objects.size(); i++)
  85                 delete (Biome *)m_objects[i];
  86
  87         m_objects.resize(1);
  88 }
  89
  90 ////////////////////////////////////////////////////////////////////////////////
  91
  92
  93 void BiomeParamsOriginal::readParams(const Settings *settings)
  94 {
  95         settings->getNoiseParams("mg_biome_np_heat",           np_heat);
  96         settings->getNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
  97         settings->getNoiseParams("mg_biome_np_humidity",       np_humidity);
  98         settings->getNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
  99 }
 100
 101
 102 void BiomeParamsOriginal::writeParams(Settings *settings) const
 103 {
 104         settings->setNoiseParams("mg_biome_np_heat",           np_heat);
 105         settings->setNoiseParams("mg_biome_np_heat_blend",     np_heat_blend);
 106         settings->setNoiseParams("mg_biome_np_humidity",       np_humidity);
 107         settings->setNoiseParams("mg_biome_np_humidity_blend", np_humidity_blend);
 108 }
 109
 110
 111 ////////////////////////////////////////////////////////////////////////////////
 112
 113 BiomeGenOriginal::BiomeGenOriginal(BiomeManager *biomemgr,
 114         BiomeParamsOriginal *params, v3s16 chunksize)
 115 {
 116         m_bmgr   = biomemgr;
 117         m_params = params;
 118         m_csize  = chunksize;
 119
 120         noise_heat           = new Noise(&params->np_heat,
 121                                                                         params->seed, m_csize.X, m_csize.Z);
 122         noise_humidity       = new Noise(&params->np_humidity,
 123                                                                         params->seed, m_csize.X, m_csize.Z);
 124         noise_heat_blend     = new Noise(&params->np_heat_blend,
 125                                                                         params->seed, m_csize.X, m_csize.Z);
 126         noise_humidity_blend = new Noise(&params->np_humidity_blend,
 127                                                                         params->seed, m_csize.X, m_csize.Z);
 128
 129         heatmap  = noise_heat->result;
 130         humidmap = noise_humidity->result;
 131         biomemap = new biome_t[m_csize.X * m_csize.Z];
 132 }
 133
 134 BiomeGenOriginal::~BiomeGenOriginal()
 135 {
 136         delete []biomemap;
 137
 138         delete noise_heat;
 139         delete noise_humidity;
 140         delete noise_heat_blend;
 141         delete noise_humidity_blend;
 142 }
 143
 144
 145 Biome *BiomeGenOriginal::calcBiomeAtPoint(v3s16 pos) const
 146 {
 147         float heat =
 148                 NoisePerlin2D(&m_params->np_heat,       pos.X, pos.Z, m_params->seed) +
 149                 NoisePerlin2D(&m_params->np_heat_blend, pos.X, pos.Z, m_params->seed);
 150         float humidity =
 151                 NoisePerlin2D(&m_params->np_humidity,       pos.X, pos.Z, m_params->seed) +
 152                 NoisePerlin2D(&m_params->np_humidity_blend, pos.X, pos.Z, m_params->seed);
 153
 154         return calcBiomeFromNoise(heat, humidity, pos.Y);
 155 }
 156
 157
 158 void BiomeGenOriginal::calcBiomeNoise(v3s16 pmin)
 159 {
 160         m_pmin = pmin;
 161
 162         noise_heat->perlinMap2D(pmin.X, pmin.Z);
 163         noise_humidity->perlinMap2D(pmin.X, pmin.Z);
 164         noise_heat_blend->perlinMap2D(pmin.X, pmin.Z);
 165         noise_humidity_blend->perlinMap2D(pmin.X, pmin.Z);
 166
 167         for (s32 i = 0; i < m_csize.X * m_csize.Z; i++) {
 168                 noise_heat->result[i]     += noise_heat_blend->result[i];
 169                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 170         }
 171 }
 172
 173
 174 biome_t *BiomeGenOriginal::getBiomes(s16 *heightmap)
 175 {
 176         for (s32 i = 0; i != m_csize.X * m_csize.Z; i++) {
 177                 Biome *biome = calcBiomeFromNoise(
 178                         noise_heat->result[i],
 179                         noise_humidity->result[i],
 180                         heightmap[i]);
 181
 182                 biomemap[i] = biome->index;
 183         }
 184
 185         return biomemap;
 186 }
 187
 188
 189 Biome *BiomeGenOriginal::getBiomeAtPoint(v3s16 pos) const
 190 {
 191         return getBiomeAtIndex(
 192                 (pos.Z - m_pmin.Z) * m_csize.X + (pos.X - m_pmin.X),
 193                 pos.Y);
 194 }
 195
 196
 197 Biome *BiomeGenOriginal::getBiomeAtIndex(size_t index, s16 y) const
 198 {
 199         return calcBiomeFromNoise(
 200                 noise_heat->result[index],
 201                 noise_humidity->result[index],
 202                 y);
 203 }
 204
 205
 206 Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, s16 y) const
 207 {
 208         Biome *b, *biome_closest = NULL;
 209         float dist_min = FLT_MAX;
 210
 211         for (size_t i = 1; i < m_bmgr->getNumObjects(); i++) {
 212                 b = (Biome *)m_bmgr->getRaw(i);
 213                 if (!b || y > b->y_max || y < b->y_min)
 214                         continue;
 215
 216                 float d_heat     = heat     - b->heat_point;
 217                 float d_humidity = humidity - b->humidity_point;
 218                 float dist = (d_heat * d_heat) +
 219                                          (d_humidity * d_humidity);
 220                 if (dist < dist_min) {
 221                         dist_min = dist;
 222                         biome_closest = b;
 223                 }
 224         }
 225
 226         return biome_closest ? biome_closest : (Biome *)m_bmgr->getRaw(BIOME_NONE);
 227 }
 228
 229
 230 ////////////////////////////////////////////////////////////////////////////////
 231
 232 void Biome::resolveNodeNames()
 233 {
 234         getIdFromNrBacklog(&c_top,         "mapgen_stone",              CONTENT_AIR);
 235         getIdFromNrBacklog(&c_filler,      "mapgen_stone",              CONTENT_AIR);
 236         getIdFromNrBacklog(&c_stone,       "mapgen_stone",              CONTENT_AIR);
 237         getIdFromNrBacklog(&c_water_top,   "mapgen_water_source",       CONTENT_AIR);
 238         getIdFromNrBacklog(&c_water,       "mapgen_water_source",       CONTENT_AIR);
 239         getIdFromNrBacklog(&c_river_water, "mapgen_river_water_source", CONTENT_AIR);
 240         getIdFromNrBacklog(&c_riverbed,    "mapgen_stone",              CONTENT_AIR);
 241         getIdFromNrBacklog(&c_dust,        "ignore",                    CONTENT_IGNORE);
 242 }