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 "gamedef.h"
  24 #include "nodedef.h"
  25 #include "map.h" //for MMVManip
  26 #include "log.h"
  27 #include "util/numeric.h"
  28 #include "util/mathconstants.h"
  29 #include "porting.h"
  30
  31
  32 ///////////////////////////////////////////////////////////////////////////////
  33
  34
  35 BiomeManager::BiomeManager(IGameDef *gamedef) :
  36         ObjDefManager(gamedef, OBJDEF_BIOME)
  37 {
  38         m_gamedef = gamedef;
  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    = 0;
  47         b->depth_water_top = 0;
  48         b->y_min           = -MAP_GENERATION_LIMIT;
  49         b->y_max           = MAP_GENERATION_LIMIT;
  50         b->heat_point      = 0.0;
  51         b->humidity_point  = 0.0;
  52
  53         b->m_nodenames.push_back("air");
  54         b->m_nodenames.push_back("air");
  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("air");
  60         m_ndef->pendNodeResolve(b, NODE_RESOLVE_DEFERRED);
  61
  62         add(b);
  63 }
  64
  65
  66
  67 BiomeManager::~BiomeManager()
  68 {
  69         //if (biomecache)
  70         //      delete[] biomecache;
  71 }
  72
  73
  74
  75 // just a PoC, obviously needs optimization later on (precalculate this)
  76 void BiomeManager::calcBiomes(s16 sx, s16 sy, float *heat_map,
  77         float *humidity_map, s16 *height_map, u8 *biomeid_map)
  78 {
  79         for (s32 i = 0; i != sx * sy; i++) {
  80                 Biome *biome = getBiome(heat_map[i], humidity_map[i], height_map[i]);
  81                 biomeid_map[i] = biome->index;
  82         }
  83 }
  84
  85
  86 Biome *BiomeManager::getBiome(float heat, float humidity, s16 y)
  87 {
  88         Biome *b, *biome_closest = NULL;
  89         float dist_min = FLT_MAX;
  90
  91         for (size_t i = 1; i < m_objects.size(); i++) {
  92                 b = (Biome *)m_objects[i];
  93                 if (!b || y > b->y_max || y < b->y_min)
  94                         continue;
  95
  96                 float d_heat     = heat     - b->heat_point;
  97                 float d_humidity = humidity - b->humidity_point;
  98                 float dist = (d_heat * d_heat) +
  99                                          (d_humidity * d_humidity);
 100                 if (dist < dist_min) {
 101                         dist_min = dist;
 102                         biome_closest = b;
 103                 }
 104         }
 105
 106         return biome_closest ? biome_closest : (Biome *)m_objects[0];
 107 }
 108
 109 void BiomeManager::clear()
 110 {
 111         EmergeManager *emerge = m_gamedef->getEmergeManager();
 112
 113         // Remove all dangling references in Decorations
 114         DecorationManager *decomgr = emerge->decomgr;
 115         for (size_t i = 0; i != decomgr->getNumObjects(); i++) {
 116                 Decoration *deco = (Decoration *)decomgr->getRaw(i);
 117                 deco->biomes.clear();
 118         }
 119
 120         // Don't delete the first biome
 121         for (size_t i = 1; i < m_objects.size(); i++) {
 122                 Biome *b = (Biome *)m_objects[i];
 123                 delete b;
 124         }
 125
 126         m_objects.resize(1);
 127 }
 128
 129
 130 ///////////////////////////////////////////////////////////////////////////////
 131
 132
 133 void Biome::resolveNodeNames()
 134 {
 135         getIdFromNrBacklog(&c_top,         "mapgen_dirt_with_grass",    CONTENT_AIR);
 136         getIdFromNrBacklog(&c_filler,      "mapgen_dirt",               CONTENT_AIR);
 137         getIdFromNrBacklog(&c_stone,       "mapgen_stone",              CONTENT_AIR);
 138         getIdFromNrBacklog(&c_water_top,   "mapgen_water_source",       CONTENT_AIR);
 139         getIdFromNrBacklog(&c_water,       "mapgen_water_source",       CONTENT_AIR);
 140         getIdFromNrBacklog(&c_river_water, "mapgen_river_water_source", CONTENT_AIR);
 141         getIdFromNrBacklog(&c_dust,        "air",                       CONTENT_IGNORE);
 142 }
 143