src/mapgen.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   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 "mapgen.h"
  21 #include "voxel.h"
  22 #include "noise.h"
  23 #include "biome.h"
  24 #include "mapblock.h"
  25 #include "mapnode.h"
  26 #include "map.h"
  27 //#include "serverobject.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "content_mapnode.h" // For content_mapnode_get_new_name
  31 #include "voxelalgorithms.h"
  32 #include "profiler.h"
  33 #include "settings.h" // For g_settings
  34 #include "main.h" // For g_profiler
  35 #include "treegen.h"
  36 #include "mapgen_v6.h"
  37
  38 FlagDesc flagdesc_mapgen[] = {
  39         {"trees",          MG_TREES},
  40         {"caves",          MG_CAVES},
  41         {"dungeons",       MG_DUNGEONS},
  42         {"v6_forests",     MGV6_FORESTS},
  43         {"v6_biome_blend", MGV6_BIOME_BLEND},
  44         {"flat",           MG_FLAT},
  45         {NULL,                     0}
  46 };
  47
  48
  49 ///////////////////////////////////////////////////////////////////////////////
  50
  51
  52 void Mapgen::updateLiquid(UniqueQueue<v3s16> *trans_liquid, v3s16 nmin, v3s16 nmax) {
  53         bool isliquid, wasliquid;
  54         u32 i;
  55
  56         for (s16 z = nmin.Z; z <= nmax.Z; z++) {
  57                 for (s16 x = nmin.X; x <= nmax.X; x++) {
  58                         v2s16 p2d(x, z);
  59                         wasliquid = true;
  60                         v3s16 em  = vm->m_area.getExtent();
  61                         i = vm->m_area.index(v3s16(p2d.X, nmax.Y, p2d.Y));
  62
  63                         for (s16 y = nmax.Y; y >= nmin.Y; y--) {
  64                                 isliquid = ndef->get(vm->m_data[i]).isLiquid();
  65
  66                                 // there was a change between liquid and nonliquid, add to queue
  67                                 if (isliquid != wasliquid)
  68                                         trans_liquid->push_back(v3s16(p2d.X, y, p2d.Y));
  69
  70                                 wasliquid = isliquid;
  71                                 vm->m_area.add_y(em, i, -1);
  72                         }
  73                 }
  74         }
  75 }
  76
  77
  78 void Mapgen::updateLighting(v3s16 nmin, v3s16 nmax) {
  79         enum LightBank banks[2] = {LIGHTBANK_DAY, LIGHTBANK_NIGHT};
  80
  81         VoxelArea a(nmin - v3s16(1,0,1) * MAP_BLOCKSIZE,
  82                                 nmax + v3s16(1,0,1) * MAP_BLOCKSIZE);
  83         bool block_is_underground = (water_level > nmax.Y);
  84         bool sunlight = !block_is_underground;
  85
  86         ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update", SPT_AVG);
  87         for (int i = 0; i < 2; i++) {
  88                 enum LightBank bank = banks[i];
  89         std::set<v3s16> light_sources;
  90         std::map<v3s16, u8> unlight_from;
  91
  92                 voxalgo::clearLightAndCollectSources(*vm, a, bank, ndef,
  93                                         light_sources, unlight_from);
  94                 voxalgo::propagateSunlight(*vm, a, sunlight, light_sources, ndef);
  95                 vm->unspreadLight(bank, unlight_from, light_sources, ndef);
  96                 vm->spreadLight(bank, light_sources, ndef);
  97         }
  98 }
  99
 100
 101 //////////////////////// Mapgen V6 parameter read/write
 102
 103 bool MapgenV6Params::readParams(Settings *settings) {
 104         freq_desert = settings->getFloat("mgv6_freq_desert");
 105         freq_beach  = settings->getFloat("mgv6_freq_beach");
 106
 107         np_terrain_base   = settings->getNoiseParams("mgv6_np_terrain_base");
 108         np_terrain_higher = settings->getNoiseParams("mgv6_np_terrain_higher");
 109         np_steepness      = settings->getNoiseParams("mgv6_np_steepness");
 110         np_height_select  = settings->getNoiseParams("mgv6_np_height_select");
 111         np_trees          = settings->getNoiseParams("mgv6_np_trees");
 112         np_mud            = settings->getNoiseParams("mgv6_np_mud");
 113         np_beach          = settings->getNoiseParams("mgv6_np_beach");
 114         np_biome          = settings->getNoiseParams("mgv6_np_biome");
 115         np_cave           = settings->getNoiseParams("mgv6_np_cave");
 116
 117         bool success =
 118                 np_terrain_base  && np_terrain_higher && np_steepness &&
 119                 np_height_select && np_trees          && np_mud       &&
 120                 np_beach         && np_biome          && np_cave;
 121         return success;
 122 }
 123
 124
 125 void MapgenV6Params::writeParams(Settings *settings) {
 126         settings->setFloat("mgv6_freq_desert", freq_desert);
 127         settings->setFloat("mgv6_freq_beach",  freq_beach);
 128
 129         settings->setNoiseParams("mgv6_np_terrain_base",   np_terrain_base);
 130         settings->setNoiseParams("mgv6_np_terrain_higher", np_terrain_higher);
 131         settings->setNoiseParams("mgv6_np_steepness",      np_steepness);
 132         settings->setNoiseParams("mgv6_np_height_select",  np_height_select);
 133         settings->setNoiseParams("mgv6_np_trees",          np_trees);
 134         settings->setNoiseParams("mgv6_np_mud",            np_mud);
 135         settings->setNoiseParams("mgv6_np_beach",          np_beach);
 136         settings->setNoiseParams("mgv6_np_biome",          np_biome);
 137         settings->setNoiseParams("mgv6_np_cave",           np_cave);
 138 }
 139
 140
 141 /////////////////////////////////// legacy static functions for farmesh
 142
 143
 144 s16 Mapgen::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision) {
 145         //just need to return something
 146         s16 level = 5;
 147         return level;
 148 }
 149
 150
 151 bool Mapgen::get_have_beach(u64 seed, v2s16 p2d) {
 152         double sandnoise = noise2d_perlin(
 153                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 154                         seed+59420, 3, 0.50);
 155
 156         return (sandnoise > 0.15);
 157 }
 158
 159
 160 double Mapgen::tree_amount_2d(u64 seed, v2s16 p) {
 161         double noise = noise2d_perlin(
 162                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 163                         seed+2, 4, 0.66);
 164         double zeroval = -0.39;
 165         if(noise < zeroval)
 166                 return 0;
 167         else
 168                 return 0.04 * (noise-zeroval) / (1.0-zeroval);
 169 }