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, chunk_size, 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 inverse_chance = math.floor(chunk_size*chunk_size*chunk_size / ore_per_chunk)
  42         --print("generate_ore num_chunks: "..dump(num_chunks))
  43         for i=1,num_chunks do
  44                 local y0 = pr:next(y_min, y_max-chunk_size+1)
  45                 if y0 >= height_min and y0 <= height_max then
  46                         local x0 = pr:next(minp.x, maxp.x-chunk_size+1)
  47                         local z0 = pr:next(minp.z, maxp.z-chunk_size+1)
  48                         local p0 = {x=x0, y=y0, z=z0}
  49                         for x1=0,chunk_size-1 do
  50                         for y1=0,chunk_size-1 do
  51                         for z1=0,chunk_size-1 do
  52                                 if pr:next(1,inverse_chance) == 1 then
  53                                         local x2 = x0+x1
  54                                         local y2 = y0+y1
  55                                         local z2 = z0+z1
  56                                         local p2 = {x=x2, y=y2, z=z2}
  57                                         if minetest.env:get_node(p2).name == wherein then
  58                                                 minetest.env:set_node(p2, {name=name})
  59                                         end
  60                                 end
  61                         end
  62                         end
  63                         end
  64                 end
  65         end
  66         --print("generate_ore done")
  67 end
  68
  69 function default.make_papyrus(pos, size)
  70         for y=0,size-1 do
  71                 local p = {x=pos.x, y=pos.y+y, z=pos.z}
  72                 local nn = minetest.env:get_node(p).name
  73                 if minetest.registered_nodes[nn] and
  74                         minetest.registered_nodes[nn].buildable_to then
  75                         minetest.env:set_node(p, {name="default:papyrus"})
  76                 else
  77                         return
  78                 end
  79         end
  80 end
  81
  82 function default.make_cactus(pos, size)
  83         for y=0,size-1 do
  84                 local p = {x=pos.x, y=pos.y+y, z=pos.z}
  85                 local nn = minetest.env:get_node(p).name
  86                 if minetest.registered_nodes[nn] and
  87                         minetest.registered_nodes[nn].buildable_to then
  88                         minetest.env:set_node(p, {name="default:cactus"})
  89                 else
  90                         return
  91                 end
  92         end
  93 end
  94
  95 -- facedir: 0/1/2/3 (head node facedir value)
  96 -- length: length of rainbow tail
  97 function default.make_nyancat(pos, facedir, length)
  98         local tailvec = {x=0, y=0, z=0}
  99         if facedir == 0 then
 100                 tailvec.z = 1
 101         elseif facedir == 1 then
 102                 tailvec.x = 1
 103         elseif facedir == 2 then
 104                 tailvec.z = -1
 105         elseif facedir == 3 then
 106                 tailvec.x = -1
 107         else
 108                 print("default.make_nyancat(): Invalid facedir: "+dump(facedir))
 109                 facedir = 0
 110                 tailvec.z = 1
 111         end
 112         local p = {x=pos.x, y=pos.y, z=pos.z}
 113         minetest.env:set_node(p, {name="default:nyancat", param2=facedir})
 114         for i=1,length do
 115                 p.x = p.x + tailvec.x
 116                 p.z = p.z + tailvec.z
 117                 minetest.env:set_node(p, {name="default:nyancat_rainbow"})
 118         end
 119 end
 120
 121 function generate_nyancats(seed, minp, maxp)
 122         local height_min = -31000
 123         local height_max = -32
 124         if maxp.y < height_min or minp.y > height_max then
 125                 return
 126         end
 127         local y_min = math.max(minp.y, height_min)
 128         local y_max = math.min(maxp.y, height_max)
 129         local volume = (maxp.x-minp.x+1)*(y_max-y_min+1)*(maxp.z-minp.z+1)
 130         local pr = PseudoRandom(seed + 9324342)
 131         local max_num_nyancats = math.floor(volume / (16*16*16))
 132         for i=1,max_num_nyancats do
 133                 if pr:next(0, 1000) == 0 then
 134                         local x0 = pr:next(minp.x, maxp.x)
 135                         local y0 = pr:next(minp.y, maxp.y)
 136                         local z0 = pr:next(minp.z, maxp.z)
 137                         local p0 = {x=x0, y=y0, z=z0}
 138                         default.make_nyancat(p0, pr:next(0,3), pr:next(3,15))
 139                 end
 140         end
 141 end
 142
 143 minetest.register_on_generated(function(minp, maxp, seed)
 144         -- Generate regular ores
 145         generate_ore("default:stone_with_coal", "default:stone", minp, maxp, seed+0, 1/8/8/8,    3, 8, -31000,  64)
 146         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+1, 1/12/12/12, 2, 3,    -15,   2)
 147         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+2, 1/9/9/9,    3, 5,    -63, -16)
 148         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+3, 1/7/7/7,    3, 5, -31000, -64)
 149
 150         generate_ore("default:stone_with_mese", "default:stone", minp, maxp, seed+4, 1/16/16/16, 2, 3,   -127,  -64)
 151         generate_ore("default:stone_with_mese", "default:stone", minp, maxp, seed+5, 1/9/9/9,    3, 5, -31000, -128)
 152         generate_ore("default:mese",            "default:stone", minp, maxp, seed+8, 1/16/16/16, 2, 3, -31000,-1024)
 153
 154         generate_ore("default:stone_with_coal", "default:stone", minp, maxp, seed+7, 1/24/24/24, 6,27, -31000,  0)
 155         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+6, 1/24/24/24, 6,27, -31000, -64)
 156
 157         if maxp.y >= 2 and minp.y <= 0 then
 158                 -- Generate clay
 159                 -- Assume X and Z lengths are equal
 160                 local divlen = 4
 161                 local divs = (maxp.x-minp.x)/divlen+1;
 162                 for divx=0+1,divs-1-1 do
 163                 for divz=0+1,divs-1-1 do
 164                         local cx = minp.x + math.floor((divx+0.5)*divlen)
 165                         local cz = minp.z + math.floor((divz+0.5)*divlen)
 166                         if minetest.env:get_node({x=cx,y=1,z=cz}).name == "default:water_source" and
 167                                         minetest.env:get_node({x=cx,y=0,z=cz}).name == "default:sand" then
 168                                 local is_shallow = true
 169                                 local num_water_around = 0
 170                                 if minetest.env:get_node({x=cx-divlen*2,y=1,z=cz+0}).name == "default:water_source" then
 171                                         num_water_around = num_water_around + 1 end
 172                                 if minetest.env:get_node({x=cx+divlen*2,y=1,z=cz+0}).name == "default:water_source" then
 173                                         num_water_around = num_water_around + 1 end
 174                                 if minetest.env:get_node({x=cx+0,y=1,z=cz-divlen*2}).name == "default:water_source" then
 175                                         num_water_around = num_water_around + 1 end
 176                                 if minetest.env:get_node({x=cx+0,y=1,z=cz+divlen*2}).name == "default:water_source" then
 177                                         num_water_around = num_water_around + 1 end
 178                                 if num_water_around >= 2 then
 179                                         is_shallow = false
 180                                 end
 181                                 if is_shallow then
 182                                         for x1=-divlen,divlen do
 183                                         for z1=-divlen,divlen do
 184                                                 if minetest.env:get_node({x=cx+x1,y=0,z=cz+z1}).name == "default:sand" then
 185                                                         minetest.env:set_node({x=cx+x1,y=0,z=cz+z1}, {name="default:clay"})
 186                                                 end
 187                                         end
 188                                         end
 189                                 end
 190                         end
 191                 end
 192                 end
 193                 -- Generate papyrus
 194                 local perlin1 = minetest.env:get_perlin(354, 3, 0.7, 100)
 195                 -- Assume X and Z lengths are equal
 196                 local divlen = 8
 197                 local divs = (maxp.x-minp.x)/divlen+1;
 198                 for divx=0,divs-1 do
 199                 for divz=0,divs-1 do
 200                         local x0 = minp.x + math.floor((divx+0)*divlen)
 201                         local z0 = minp.z + math.floor((divz+0)*divlen)
 202                         local x1 = minp.x + math.floor((divx+1)*divlen)
 203                         local z1 = minp.z + math.floor((divz+1)*divlen)
 204                         -- Determine papyrus amount from perlin noise
 205                         local papyrus_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 45 - 20)
 206                         -- Find random positions for papyrus based on this random
 207                         local pr = PseudoRandom(seed+1)
 208                         for i=0,papyrus_amount do
 209                                 local x = pr:next(x0, x1)
 210                                 local z = pr:next(z0, z1)
 211                                 if minetest.env:get_node({x=x,y=1,z=z}).name == "default:dirt_with_grass" and
 212                                                 minetest.env:find_node_near({x=x,y=1,z=z}, 1, "default:water_source") then
 213                                         default.make_papyrus({x=x,y=2,z=z}, pr:next(2, 4))
 214                                 end
 215                         end
 216                 end
 217                 end
 218                 -- Generate cactuses
 219                 local perlin1 = minetest.env:get_perlin(230, 3, 0.6, 100)
 220                 -- Assume X and Z lengths are equal
 221                 local divlen = 16
 222                 local divs = (maxp.x-minp.x)/divlen+1;
 223                 for divx=0,divs-1 do
 224                 for divz=0,divs-1 do
 225                         local x0 = minp.x + math.floor((divx+0)*divlen)
 226                         local z0 = minp.z + math.floor((divz+0)*divlen)
 227                         local x1 = minp.x + math.floor((divx+1)*divlen)
 228                         local z1 = minp.z + math.floor((divz+1)*divlen)
 229                         -- Determine cactus amount from perlin noise
 230                         local cactus_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 6 - 3)
 231                         -- Find random positions for cactus based on this random
 232                         local pr = PseudoRandom(seed+1)
 233                         for i=0,cactus_amount do
 234                                 local x = pr:next(x0, x1)
 235                                 local z = pr:next(z0, z1)
 236                                 -- Find ground level (0...15)
 237                                 local ground_y = nil
 238                                 for y=30,0,-1 do
 239                                         if minetest.env:get_node({x=x,y=y,z=z}).name ~= "air" then
 240                                                 ground_y = y
 241                                                 break
 242                                         end
 243                                 end
 244                                 -- If desert sand, make cactus
 245                                 if ground_y and minetest.env:get_node({x=x,y=ground_y,z=z}).name == "default:desert_sand" then
 246                                         default.make_cactus({x=x,y=ground_y+1,z=z}, pr:next(3, 4))
 247                                 end
 248                         end
 249                 end
 250                 end
 251                 -- Generate dry shrubs
 252                 local perlin1 = minetest.env:get_perlin(329, 3, 0.6, 100)
 253                 -- Assume X and Z lengths are equal
 254                 local divlen = 16
 255                 local divs = (maxp.x-minp.x)/divlen+1;
 256                 for divx=0,divs-1 do
 257                 for divz=0,divs-1 do
 258                         local x0 = minp.x + math.floor((divx+0)*divlen)
 259                         local z0 = minp.z + math.floor((divz+0)*divlen)
 260                         local x1 = minp.x + math.floor((divx+1)*divlen)
 261                         local z1 = minp.z + math.floor((divz+1)*divlen)
 262                         -- Determine dry shrubs amount from perlin noise
 263                         local shrub_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 5 + 0)
 264                         -- Find random positions for dry shrubs based on this random
 265                         local pr = PseudoRandom(seed+1)
 266                         for i=0,shrub_amount do
 267                                 local x = pr:next(x0, x1)
 268                                 local z = pr:next(z0, z1)
 269                                 -- Find ground level (0...15)
 270                                 local ground_y = nil
 271                                 for y=30,0,-1 do
 272                                         if minetest.env:get_node({x=x,y=y,z=z}).name ~= "air" then
 273                                                 ground_y = y
 274                                                 break
 275                                         end
 276                                 end
 277                                 -- If desert sand, make dry shrub
 278                                 if ground_y and minetest.env:get_node({x=x,y=ground_y,z=z}).name == "default:desert_sand" then
 279                                         local p = {x=x,y=ground_y+1,z=z}
 280                                         local nn = minetest.env:get_node(p).name
 281                                         if minetest.registered_nodes[nn] and
 282                                                 minetest.registered_nodes[nn].buildable_to then
 283                                                 minetest.env:set_node(p, {name="default:dry_shrub"})
 284                                         end
 285                                 end
 286                         end
 287                 end
 288                 end
 289         end
 290
 291         -- Generate nyan cats
 292         generate_nyancats(seed, minp, maxp)
 293 end)
 294