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