mods/default/mapgen.lua

   1 -- minetest/default/mapgen.lua
   2
   3 --
   4 -- Aliases for map generator outputs
   5 --
   6
   7 minetest.register_alias("mapgen_air", "air")
   8 minetest.register_alias("mapgen_stone", "default:stone")
   9 minetest.register_alias("mapgen_tree", "default:tree")
  10 minetest.register_alias("mapgen_leaves", "default:leaves")
  11 minetest.register_alias("mapgen_apple", "default:apple")
  12 minetest.register_alias("mapgen_water_source", "default:water_source")
  13 minetest.register_alias("mapgen_dirt", "default:dirt")
  14 minetest.register_alias("mapgen_sand", "default:sand")
  15 minetest.register_alias("mapgen_gravel", "default:gravel")
  16 minetest.register_alias("mapgen_clay", "default:clay")
  17 minetest.register_alias("mapgen_lava_source", "default:lava_source")
  18 minetest.register_alias("mapgen_cobble", "default:cobble")
  19 minetest.register_alias("mapgen_mossycobble", "default:mossycobble")
  20 minetest.register_alias("mapgen_dirt_with_grass", "default:dirt_with_grass")
  21 minetest.register_alias("mapgen_junglegrass", "default:junglegrass")
  22 minetest.register_alias("mapgen_stone_with_coal", "default:stone_with_coal")
  23 minetest.register_alias("mapgen_stone_with_iron", "default:stone_with_iron")
  24 minetest.register_alias("mapgen_mese", "default:mese")
  25 minetest.register_alias("mapgen_desert_sand", "default:desert_sand")
  26 minetest.register_alias("mapgen_desert_stone", "default:desert_stone")
  27
  28 --
  29 -- Ore generation
  30 --
  31
  32 local function generate_ore(name, wherein, minp, maxp, seed, chunks_per_volume, ore_per_chunk, height_min, height_max)
  33         if maxp.y < height_min or minp.y > height_max then
  34                 return
  35         end
  36         local y_min = math.max(minp.y, height_min)
  37         local y_max = math.min(maxp.y, height_max)
  38         local volume = (maxp.x-minp.x+1)*(y_max-y_min+1)*(maxp.z-minp.z+1)
  39         local pr = PseudoRandom(seed)
  40         local num_chunks = math.floor(chunks_per_volume * volume)
  41         local chunk_size = 3
  42         if ore_per_chunk <= 4 then
  43                 chunk_size = 2
  44         end
  45         local inverse_chance = math.floor(chunk_size*chunk_size*chunk_size / ore_per_chunk)
  46         --print("generate_ore num_chunks: "..dump(num_chunks))
  47         for i=1,num_chunks do
  48                 local y0 = pr:next(y_min, y_max-chunk_size+1)
  49                 if y0 >= height_min and y0 <= height_max then
  50                         local x0 = pr:next(minp.x, maxp.x-chunk_size+1)
  51                         local z0 = pr:next(minp.z, maxp.z-chunk_size+1)
  52                         local p0 = {x=x0, y=y0, z=z0}
  53                         for x1=0,chunk_size-1 do
  54                         for y1=0,chunk_size-1 do
  55                         for z1=0,chunk_size-1 do
  56                                 if pr:next(1,inverse_chance) == 1 then
  57                                         local x2 = x0+x1
  58                                         local y2 = y0+y1
  59                                         local z2 = z0+z1
  60                                         local p2 = {x=x2, y=y2, z=z2}
  61                                         if minetest.env:get_node(p2).name == wherein then
  62                                                 minetest.env:set_node(p2, {name=name})
  63                                         end
  64                                 end
  65                         end
  66                         end
  67                         end
  68                 end
  69         end
  70         --print("generate_ore done")
  71 end
  72
  73 function default.make_papyrus(pos, size)
  74         for y=0,size-1 do
  75                 local p = {x=pos.x, y=pos.y+y, z=pos.z}
  76                 minetest.env:set_node(p, {name="default:papyrus"})
  77         end
  78 end
  79
  80 function default.make_cactus(pos, size)
  81         for y=0,size-1 do
  82                 local p = {x=pos.x, y=pos.y+y, z=pos.z}
  83                 minetest.env:set_node(p, {name="default:cactus"})
  84         end
  85 end
  86
  87 minetest.register_on_generated(function(minp, maxp, seed)
  88         generate_ore("default:stone_with_coal", "default:stone", minp, maxp, seed,   1/8/8/8,    5, -31000,  64)
  89         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+1, 1/16/16/16, 5,   -5,   7)
  90         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+2, 1/12/12/12, 5, -16,   -5)
  91         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+3, 1/9/9/9,    5, -31000, -17)
  92         if maxp.y >= 2 and minp.y <= 0 then
  93                 -- Generate clay
  94                 -- Assume X and Z lengths are equal
  95                 local divlen = 4
  96                 local divs = (maxp.x-minp.x)/divlen+1;
  97                 for divx=0+1,divs-1-1 do
  98                 for divz=0+1,divs-1-1 do
  99                         local cx = minp.x + math.floor((divx+0.5)*divlen)
 100                         local cz = minp.z + math.floor((divz+0.5)*divlen)
 101                         if minetest.env:get_node({x=cx,y=1,z=cz}).name == "default:water_source" and
 102                                         minetest.env:get_node({x=cx,y=0,z=cz}).name == "default:sand" then
 103                                 local is_shallow = true
 104                                 local num_water_around = 0
 105                                 if minetest.env:get_node({x=cx-divlen*2,y=1,z=cz+0}).name == "default:water_source" then
 106                                         num_water_around = num_water_around + 1 end
 107                                 if minetest.env:get_node({x=cx+divlen*2,y=1,z=cz+0}).name == "default:water_source" then
 108                                         num_water_around = num_water_around + 1 end
 109                                 if minetest.env:get_node({x=cx+0,y=1,z=cz-divlen*2}).name == "default:water_source" then
 110                                         num_water_around = num_water_around + 1 end
 111                                 if minetest.env:get_node({x=cx+0,y=1,z=cz+divlen*2}).name == "default:water_source" then
 112                                         num_water_around = num_water_around + 1 end
 113                                 if num_water_around >= 2 then
 114                                         is_shallow = false
 115                                 end
 116                                 if is_shallow then
 117                                         for x1=-divlen,divlen do
 118                                         for z1=-divlen,divlen do
 119                                                 if minetest.env:get_node({x=cx+x1,y=0,z=cz+z1}).name == "default:sand" then
 120                                                         minetest.env:set_node({x=cx+x1,y=0,z=cz+z1}, {name="default:clay"})
 121                                                 end
 122                                         end
 123                                         end
 124                                 end
 125                         end
 126                 end
 127                 end
 128                 -- Generate papyrus
 129                 local perlin1 = minetest.env:get_perlin(354, 3, 0.7, 100)
 130                 -- Assume X and Z lengths are equal
 131                 local divlen = 8
 132                 local divs = (maxp.x-minp.x)/divlen+1;
 133                 for divx=0,divs-1 do
 134                 for divz=0,divs-1 do
 135                         local x0 = minp.x + math.floor((divx+0)*divlen)
 136                         local z0 = minp.z + math.floor((divz+0)*divlen)
 137                         local x1 = minp.x + math.floor((divx+1)*divlen)
 138                         local z1 = minp.z + math.floor((divz+1)*divlen)
 139                         -- Determine papyrus amount from perlin noise
 140                         local papyrus_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 45 - 20)
 141                         -- Find random positions for papyrus based on this random
 142                         local pr = PseudoRandom(seed+1)
 143                         for i=0,papyrus_amount do
 144                                 local x = pr:next(x0, x1)
 145                                 local z = pr:next(z0, z1)
 146                                 if minetest.env:get_node({x=x,y=1,z=z}).name == "default:dirt_with_grass" and
 147                                                 minetest.env:find_node_near({x=x,y=1,z=z}, 1, "default:water_source") then
 148                                         default.make_papyrus({x=x,y=2,z=z}, pr:next(2, 4))
 149                                 end
 150                         end
 151                 end
 152                 end
 153                 -- Generate cactuses
 154                 local perlin1 = minetest.env:get_perlin(230, 3, 0.7, 100)
 155                 -- Assume X and Z lengths are equal
 156                 local divlen = 8
 157                 local divs = (maxp.x-minp.x)/divlen+1;
 158                 for divx=0,divs-1 do
 159                 for divz=0,divs-1 do
 160                         local x0 = minp.x + math.floor((divx+0)*divlen)
 161                         local z0 = minp.z + math.floor((divz+0)*divlen)
 162                         local x1 = minp.x + math.floor((divx+1)*divlen)
 163                         local z1 = minp.z + math.floor((divz+1)*divlen)
 164                         -- Determine cactus amount from perlin noise
 165                         local cactus_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 6 - 5)
 166                         -- Find random positions for cactus based on this random
 167                         local pr = PseudoRandom(seed+1)
 168                         for i=0,cactus_amount do
 169                                 local x = pr:next(x0, x1)
 170                                 local z = pr:next(z0, z1)
 171                                 -- Find ground level (0...15)
 172                                 local ground_y = nil
 173                                 for y=30,0,-1 do
 174                                         if minetest.env:get_node({x=x,y=y,z=z}).name ~= "air" then
 175                                                 ground_y = y
 176                                                 break
 177                                         end
 178                                 end
 179                                 -- If desert sand, make cactus
 180                                 if ground_y and minetest.env:get_node({x=x,y=ground_y,z=z}).name == "default:desert_sand" then
 181                                         default.make_cactus({x=x,y=ground_y+1,z=z}, pr:next(3, 4))
 182                                 end
 183                         end
 184                 end
 185                 end
 186         end
 187 end)
 188