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 "nodedef.h"
  22 #include "map.h" //for ManualMapVoxelManipulator
  23 #include "log.h"
  24 #include "util/numeric.h"
  25 #include "main.h"
  26 #include "util/mathconstants.h"
  27 #include "porting.h"
  28
  29 NoiseParams nparams_biome_def_heat(50, 50, v3f(500.0, 500.0, 500.0), 5349, 3, 0.70);
  30 NoiseParams nparams_biome_def_humidity(50, 50, v3f(500.0, 500.0, 500.0), 842, 3, 0.55);
  31
  32
  33 BiomeDefManager::BiomeDefManager(NodeResolver *resolver)
  34 {
  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         b->depth_top      = 0;
  46         b->depth_filler   = 0;
  47         b->height_min     = -MAP_GENERATION_LIMIT;
  48         b->height_max     = MAP_GENERATION_LIMIT;
  49         b->heat_point     = 0.0;
  50         b->humidity_point = 0.0;
  51
  52         resolver->addNode("air",                 "", CONTENT_AIR, &b->c_top);
  53         resolver->addNode("air",                 "", CONTENT_AIR, &b->c_filler);
  54         resolver->addNode("mapgen_water_source", "", CONTENT_AIR, &b->c_water);
  55         resolver->addNode("air",                 "", CONTENT_AIR, &b->c_dust);
  56         resolver->addNode("mapgen_water_source", "", CONTENT_AIR, &b->c_dust_water);
  57
  58         biomes.push_back(b);
  59 }
  60
  61
  62 BiomeDefManager::~BiomeDefManager()
  63 {
  64         //if (biomecache)
  65         //      delete[] biomecache;
  66
  67         for (size_t i = 0; i != biomes.size(); i++)
  68                 delete biomes[i];
  69 }
  70
  71
  72 Biome *BiomeDefManager::createBiome(BiomeTerrainType btt)
  73 {
  74         /*switch (btt) {
  75                 case BIOME_TERRAIN_NORMAL:
  76                         return new Biome;
  77                 case BIOME_TERRAIN_LIQUID:
  78                         return new BiomeLiquid;
  79                 case BIOME_TERRAIN_NETHER:
  80                         return new BiomeHell;
  81                 case BIOME_TERRAIN_AETHER:
  82                         return new BiomeSky;
  83                 case BIOME_TERRAIN_FLAT:
  84                         return new BiomeSuperflat;
  85         }
  86         return NULL;*/
  87         return new Biome;
  88 }
  89
  90
  91 // just a PoC, obviously needs optimization later on (precalculate this)
  92 void BiomeDefManager::calcBiomes(BiomeNoiseInput *input, u8 *biomeid_map)
  93 {
  94         int i = 0;
  95         for (int y = 0; y != input->mapsize.Y; y++) {
  96                 for (int x = 0; x != input->mapsize.X; x++, i++) {
  97                         float heat     = (input->heat_map[i] + 1) * 50;
  98                         float humidity = (input->humidity_map[i] + 1) * 50;
  99                         biomeid_map[i] = getBiome(heat, humidity, input->height_map[i])->id;
 100                 }
 101         }
 102 }
 103
 104
 105 bool BiomeDefManager::addBiome(Biome *b)
 106 {
 107         if (biome_registration_finished) {
 108                 errorstream << "BiomeDefManager: biome registration already "
 109                         "finished, dropping " << b->name << std::endl;
 110                 return false;
 111         }
 112
 113         size_t nbiomes = biomes.size();
 114         if (nbiomes >= 0xFF) {
 115                 errorstream << "BiomeDefManager: too many biomes, dropping "
 116                         << b->name << std::endl;
 117                 return false;
 118         }
 119
 120         b->id = (u8)nbiomes;
 121         biomes.push_back(b);
 122         verbosestream << "BiomeDefManager: added biome " << b->name << std::endl;
 123
 124         return true;
 125 }
 126
 127
 128 Biome *BiomeDefManager::getBiome(float heat, float humidity, s16 y)
 129 {
 130         Biome *b, *biome_closest = NULL;
 131         float dist_min = FLT_MAX;
 132
 133         for (size_t i = 1; i < biomes.size(); i++) {
 134                 b = biomes[i];
 135                 if (y > b->height_max || y < b->height_min)
 136                         continue;
 137
 138                 float d_heat     = heat     - b->heat_point;
 139                 float d_humidity = humidity - b->humidity_point;
 140                 float dist = (d_heat * d_heat) +
 141                                          (d_humidity * d_humidity);
 142                 if (dist < dist_min) {
 143                         dist_min = dist;
 144                         biome_closest = b;
 145                 }
 146         }
 147
 148         return biome_closest ? biome_closest : biomes[0];
 149 }
 150
 151
 152 u8 BiomeDefManager::getBiomeIdByName(const char *name)
 153 {
 154         for (size_t i = 0; i != biomes.size(); i++) {
 155                 if (!strcasecmp(name, biomes[i]->name.c_str()))
 156                         return i;
 157         }
 158
 159         return 0;
 160 }