src/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 "biome.h"
  21 #include "nodedef.h"
  22 #include "map.h" //for ManualMapVoxelManipulator
  23 #include "log.h"
  24 #include "util/numeric.h"
  25 #include "main.h"
  26
  27
  28 NoiseParams nparams_biome_def_heat =
  29         {50, 50, v3f(500.0, 500.0, 500.0), 5349, 3, 0.70};
  30 NoiseParams nparams_biome_def_humidity =
  31         {50, 50, v3f(500.0, 500.0, 500.0), 842, 3, 0.55};
  32
  33
  34 BiomeDefManager::BiomeDefManager() {
  35         biome_registration_finished = false;
  36         np_heat     = &nparams_biome_def_heat;
  37         np_humidity = &nparams_biome_def_humidity;
  38
  39         // Create default biome to be used in case none exist
  40         Biome *b = new Biome;
  41
  42         b->id    = 0;
  43         b->name  = "Default";
  44         b->flags = 0;
  45
  46         b->depth_top    = 0;
  47         b->depth_filler = 0;
  48
  49         b->nname_top        = "air";
  50         b->nname_filler     = "air";
  51         b->nname_water      = "mapgen_water_source";
  52         b->nname_dust       = "air";
  53         b->nname_dust_water = "mapgen_water_source";
  54
  55         b->c_top        = CONTENT_IGNORE;
  56         b->c_filler     = CONTENT_IGNORE;
  57         b->c_water      = CONTENT_IGNORE;
  58         b->c_dust       = CONTENT_IGNORE;
  59         b->c_dust_water = CONTENT_IGNORE;
  60
  61         b->height_min     = -MAP_GENERATION_LIMIT;
  62         b->height_max     = MAP_GENERATION_LIMIT;
  63         b->heat_point     = 0.0;
  64         b->humidity_point = 0.0;
  65
  66         biomes.push_back(b);
  67 }
  68
  69
  70 BiomeDefManager::~BiomeDefManager() {
  71         //if (biomecache)
  72         //      delete[] biomecache;
  73
  74         for (size_t i = 0; i != biomes.size(); i++)
  75                 delete biomes[i];
  76 }
  77
  78
  79 Biome *BiomeDefManager::createBiome(BiomeTerrainType btt) {
  80         /*switch (btt) {
  81                 case BIOME_TERRAIN_NORMAL:
  82                         return new Biome;
  83                 case BIOME_TERRAIN_LIQUID:
  84                         return new BiomeLiquid;
  85                 case BIOME_TERRAIN_NETHER:
  86                         return new BiomeHell;
  87                 case BIOME_TERRAIN_AETHER:
  88                         return new BiomeSky;
  89                 case BIOME_TERRAIN_FLAT:
  90                         return new BiomeSuperflat;
  91         }
  92         return NULL;*/
  93         return new Biome;
  94 }
  95
  96
  97 // just a PoC, obviously needs optimization later on (precalculate this)
  98 void BiomeDefManager::calcBiomes(BiomeNoiseInput *input, u8 *biomeid_map) {
  99         int i = 0;
 100         for (int y = 0; y != input->mapsize.Y; y++) {
 101                 for (int x = 0; x != input->mapsize.X; x++, i++) {
 102                         float heat     = (input->heat_map[i] + 1) * 50;
 103                         float humidity = (input->humidity_map[i] + 1) * 50;
 104                         biomeid_map[i] = getBiome(heat, humidity, input->height_map[i])->id;
 105                 }
 106         }
 107 }
 108
 109
 110 void BiomeDefManager::resolveNodeNames(INodeDefManager *ndef) {
 111         Biome *b;
 112
 113         biome_registration_finished = true;
 114
 115         for (size_t i = 0; i < biomes.size(); i++) {
 116                 b = biomes[i];
 117
 118                 b->c_top = ndef->getId(b->nname_top);
 119                 if (b->c_top == CONTENT_IGNORE) {
 120                         errorstream << "BiomeDefManager::resolveNodeNames: node '"
 121                                 << b->nname_top << "' not defined" << std::endl;
 122                         b->c_top     = CONTENT_AIR;
 123                         b->depth_top = 0;
 124                 }
 125
 126                 b->c_filler = ndef->getId(b->nname_filler);
 127                 if (b->c_filler == CONTENT_IGNORE) {
 128                         errorstream << "BiomeDefManager::resolveNodeNames: node '"
 129                                 << b->nname_filler << "' not defined" << std::endl;
 130                         b->c_filler     = CONTENT_AIR;
 131                         b->depth_filler = 0;
 132                 }
 133
 134                 b->c_water = ndef->getId(b->nname_water);
 135                 if (b->c_water == CONTENT_IGNORE) {
 136                         errorstream << "BiomeDefManager::resolveNodeNames: node '"
 137                                 << b->nname_water << "' not defined" << std::endl;
 138                         b->c_water = CONTENT_AIR;
 139                 }
 140
 141                 b->c_dust = ndef->getId(b->nname_dust);
 142                 if (b->c_dust == CONTENT_IGNORE) {
 143                         errorstream << "BiomeDefManager::resolveNodeNames: node '"
 144                                 << b->nname_dust << "' not defined" << std::endl;
 145                 }
 146
 147                 b->c_dust_water = ndef->getId(b->nname_dust_water);
 148                 if (b->c_dust_water == CONTENT_IGNORE) {
 149                         errorstream << "BiomeDefManager::resolveNodeNames: node '"
 150                                 << b->nname_dust_water << "' not defined" << std::endl;
 151                 }
 152         }
 153 }
 154
 155
 156 void BiomeDefManager::addBiome(Biome *b) {
 157         if (biome_registration_finished) {
 158                 errorstream << "BIomeDefManager: biome registration already finished, dropping " << b->name <<std::endl;
 159                 delete b;
 160                 return;
 161         }
 162
 163         size_t nbiomes = biomes.size();
 164         if (nbiomes >= 0xFF) {
 165                 errorstream << "BiomeDefManager: too many biomes, dropping " << b->name << std::endl;
 166                 delete b;
 167                 return;
 168         }
 169
 170         b->id = (u8)nbiomes;
 171         biomes.push_back(b);
 172         verbosestream << "BiomeDefManager: added biome " << b->name << std::endl;
 173 }
 174
 175
 176 Biome *BiomeDefManager::getBiome(float heat, float humidity, s16 y) {
 177         Biome *b, *biome_closest = NULL;
 178         float dist_min = FLT_MAX;
 179
 180         for (size_t i = 1; i < biomes.size(); i++) {
 181                 b = biomes[i];
 182                 if (y > b->height_max || y < b->height_min)
 183                         continue;
 184
 185                 float d_heat     = heat     - b->heat_point;
 186                 float d_humidity = humidity - b->humidity_point;
 187                 float dist = (d_heat * d_heat) +
 188                                          (d_humidity * d_humidity);
 189                 if (dist < dist_min) {
 190                         dist_min = dist;
 191                         biome_closest = b;
 192                 }
 193         }
 194
 195         return biome_closest ? biome_closest : biomes[0];
 196 }
 197
 198
 199 u8 BiomeDefManager::getBiomeIdByName(const char *name) {
 200         for (size_t i = 0; i != biomes.size(); i++) {
 201                 if (!strcasecmp(name, biomes[i]->name.c_str()))
 202                         return i;
 203         }
 204
 205         return 0;
 206 }
 207
 208
 209 ///////////////////////////// Weather
 210
 211
 212 s16 BiomeDefManager::calcBlockHeat(v3s16 p, u64 seed, float timeofday, float totaltime) {
 213         //variant 1: full random
 214         //f32 heat = NoisePerlin3D(np_heat, p.X, env->getGameTime()/100, p.Z, seed);
 215
 216         //variant 2: season change based on default heat map
 217         const f32 offset = 20; // = np_heat->offset
 218         const f32 scale  = 20; // = np_heat->scale
 219         const f32 range  = 20;
 220         f32 heat = NoisePerlin2D(np_heat, p.X, p.Z, seed); // 0..50..100
 221
 222         heat -= np_heat->offset; // -50..0..+50
 223
 224         // normalizing - todo REMOVE after fixed NoiseParams nparams_biome_def_heat = {50, 50, -> 20, 50,
 225         if (np_heat->scale)
 226                 heat /= np_heat->scale / scale; //  -20..0..+20
 227
 228         f32 seasonv = totaltime;
 229         seasonv /= 86400 * g_settings->getS16("year_days"); // season change speed
 230         seasonv += (f32)p.X / 3000; // you can walk to area with other season
 231         seasonv = sin(seasonv * M_PI);
 232         heat += (range * (heat < 0 ? 2 : 0.5)) * seasonv; // -60..0..30
 233
 234         heat += offset; // -40..0..50
 235         heat += p.Y / -333; // upper=colder, lower=hotter, 3c per 1000
 236
 237         // daily change, hotter at sun +4, colder at night -4
 238         heat += 8 * (sin(cycle_shift(timeofday, -0.25) * M_PI) - 0.5); //-44..20..54
 239
 240         return heat;
 241 }
 242
 243
 244 s16 BiomeDefManager::calcBlockHumidity(v3s16 p, u64 seed, float timeofday, float totaltime) {
 245
 246         f32 humidity = NoisePerlin2D(np_humidity, p.X, p.Z, seed);
 247
 248         f32 seasonv = totaltime;
 249         seasonv /= 86400 * 2; // bad weather change speed (2 days)
 250         seasonv += (f32)p.Z / 300;
 251         humidity += 30 * sin(seasonv * M_PI);
 252
 253         humidity += -12 * (sin(cycle_shift(timeofday, -0.1) * M_PI) - 0.5);
 254         humidity = rangelim(humidity, 0, 100);
 255
 256         return humidity;
 257 }