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 "main.h"
  25
  26
  27 NoiseParams nparams_biome_def_heat =
  28         {50, 50, v3f(500.0, 500.0, 500.0), 5349, 3, 0.70};
  29 NoiseParams nparams_biome_def_humidity =
  30         {50, 50, v3f(500.0, 500.0, 500.0), 842, 3, 0.55};
  31
  32
  33 BiomeDefManager::BiomeDefManager() {
  34         biome_registration_finished = false;
  35         np_heat     = &nparams_biome_def_heat;
  36         np_humidity = &nparams_biome_def_humidity;
  37
  38         // Create default biome to be used in case none exist
  39         Biome *b = new Biome;
  40
  41         b->id    = 0;
  42         b->name  = "Default";
  43         b->flags = 0;
  44
  45         b->c_top         = CONTENT_AIR;
  46         b->top_depth     = 0;
  47         b->c_filler      = b->c_top;
  48         b->filler_height = MAP_GENERATION_LIMIT;
  49
  50         b->height_min      = -MAP_GENERATION_LIMIT;
  51         b->height_max      = MAP_GENERATION_LIMIT;
  52         b->heat_point      = 0.0;
  53         b->humidity_point  = 0.0;
  54
  55         biomes.push_back(b);
  56 }
  57
  58
  59 BiomeDefManager::~BiomeDefManager() {
  60         //if (biomecache)
  61         //      delete[] biomecache;
  62
  63         for (size_t i = 0; i != biomes.size(); i++)
  64                 delete biomes[i];
  65 }
  66
  67
  68 Biome *BiomeDefManager::createBiome(BiomeTerrainType btt) {
  69         /*switch (btt) {
  70                 case BIOME_TERRAIN_NORMAL:
  71                         return new Biome;
  72                 case BIOME_TERRAIN_LIQUID:
  73                         return new BiomeLiquid;
  74                 case BIOME_TERRAIN_NETHER:
  75                         return new BiomeHell;
  76                 case BIOME_TERRAIN_AETHER:
  77                         return new BiomeSky;
  78                 case BIOME_TERRAIN_FLAT:
  79                         return new BiomeSuperflat;
  80         }
  81         return NULL;*/
  82         return new Biome;
  83 }
  84
  85
  86 // just a PoC, obviously needs optimization later on (precalculate this)
  87 void BiomeDefManager::calcBiomes(BiomeNoiseInput *input, u8 *biomeid_map) {
  88         int i = 0;
  89         for (int y = 0; y != input->mapsize.Y; y++) {
  90                 for (int x = 0; x != input->mapsize.X; x++, i++) {
  91                         float heat     = (input->heat_map[i] + 1) * 50;
  92                         float humidity = (input->humidity_map[i] + 1) * 50;
  93                         biomeid_map[i] = getBiome(heat, humidity, input->height_map[i])->id;
  94                 }
  95         }
  96 }
  97
  98
  99 void BiomeDefManager::resolveNodeNames(INodeDefManager *ndef) {
 100         Biome *b;
 101
 102         biome_registration_finished = true;
 103
 104         for (size_t i = 0; i != biomes.size(); i++) {
 105                 b = biomes[i];
 106
 107                 if (b->c_top == CONTENT_IGNORE) {
 108                         b->c_top = ndef->getId(b->top_nodename);
 109                         if (b->c_top == CONTENT_IGNORE) {
 110                                 errorstream << "BiomeDefManager::resolveNodeNames: node '"
 111                                         << b->top_nodename << "' not defined" << std::endl;
 112                                 b->c_top = CONTENT_AIR;
 113                                 b->top_depth = 0;
 114                         }
 115                 }
 116
 117                 if (b->c_filler == CONTENT_IGNORE) {
 118                         b->c_filler = ndef->getId(b->filler_nodename);
 119                         if (b->c_filler == CONTENT_IGNORE) {
 120                                 errorstream << "BiomeDefManager::resolveNodeNames: node '"
 121                                         << b->filler_nodename << "' not defined" << std::endl;
 122                                 b->c_filler = CONTENT_AIR;
 123                                 b->filler_height = MAP_GENERATION_LIMIT;
 124                         }
 125                 }
 126         }
 127 }
 128
 129
 130 void BiomeDefManager::addBiome(Biome *b) {
 131         if (biome_registration_finished) {
 132                 errorstream << "BIomeDefManager: biome registration already finished, dropping " << b->name <<std::endl;
 133                 delete b;
 134                 return;
 135         }
 136
 137         size_t nbiomes = biomes.size();
 138         if (nbiomes >= 0xFF) {
 139                 errorstream << "BiomeDefManager: too many biomes, dropping " << b->name << std::endl;
 140                 delete b;
 141                 return;
 142         }
 143
 144         b->id = (u8)nbiomes;
 145         biomes.push_back(b);
 146         verbosestream << "BiomeDefManager: added biome " << b->name << std::endl;
 147 }
 148
 149
 150 Biome *BiomeDefManager::getBiome(float heat, float humidity, s16 y) {
 151         Biome *b, *biome_closest = NULL;
 152         float dist_min = FLT_MAX;
 153
 154         for (size_t i = 1; i < biomes.size(); i++) {
 155                 b = biomes[i];
 156                 if (y > b->height_max || y < b->height_min)
 157                         continue;
 158
 159                 float d_heat      = heat     - b->heat_point;
 160                 float d_humidity  = humidity - b->humidity_point;
 161                 float dist = (d_heat * d_heat) +
 162                                          (d_humidity * d_humidity);
 163                 if (dist < dist_min) {
 164                         dist_min = dist;
 165                         biome_closest = b;
 166                 }
 167         }
 168
 169         return biome_closest ? biome_closest : biomes[0];
 170 }