forked from mtcontrib/minetest-mod-snow
315 lines
9.3 KiB
Lua
315 lines
9.3 KiB
Lua
-- 2D noise for coldness
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local np_cold = {
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offset = 0,
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scale = 1,
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spread = {x=150, y=150, z=150},
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seed = 112,
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octaves = 3,
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persist = 0.5
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}
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-- 2D noise for icetype
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local np_ice = {
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offset = 0,
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scale = 1,
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spread = {x=80, y=80, z=80},
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seed = 322345,
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octaves = 3,
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persist = 0.5
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}
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-- Debugging function
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local biome_to_string = function(num,num2)
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local biome, biome2
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if num == 1 then
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biome = "snowy"
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elseif num == 2 then
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biome = "plain"
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elseif num == 3 then
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biome = "alpine"
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elseif num == 4 or num == 5 then
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biome = "normal"
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else
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biome = "unknown "..num
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end
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if num2 == 1 then
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biome2 = "cool"
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elseif num2 == 2 then
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biome2 = "icebergs"
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elseif num2 == 3 then
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biome2 = "icesheet"
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elseif num2 == 4 then
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biome2 = "icecave"
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elseif num2 == 5 then
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biome2 = "icehole"
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else
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biome2 = "unknown "..num
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end
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return biome, biome2
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end
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-- On generated function
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minetest.register_on_generated(function(minp, maxp, seed)
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local t1 = os.clock()
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local x0 = minp.x
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local z0 = minp.z
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local x1 = maxp.x
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local z1 = maxp.z
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local debug = snow.debug
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local min_height = snow.min_height
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local spawn_pine = snow.voxelmanip_pine
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local smooth = snow.smooth_biomes
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local legacy = snow.legacy
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local c_dirt_with_grass = minetest.get_content_id("default:dirt_with_grass")
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local c_dirt = minetest.get_content_id("default:dirt")
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local c_tree = minetest.get_content_id("default:tree")
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local c_apple = minetest.get_content_id("default:apple")
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local c_snow = minetest.get_content_id("default:snow")
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local c_snow_block = minetest.get_content_id("default:snowblock")
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local c_dirt_with_snow = minetest.get_content_id("default:dirt_with_snow")
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local c_air = minetest.get_content_id("air")
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local c_ignore = minetest.get_content_id("ignore")
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local c_stone = minetest.get_content_id("default:stone")
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local c_dry_shrub = minetest.get_content_id("default:dry_shrub")
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local c_leaves = minetest.get_content_id("default:leaves")
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local c_jungleleaves = minetest.get_content_id("default:jungleleaves")
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local c_junglegrass = minetest.get_content_id("default:junglegrass")
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local c_ice = minetest.get_content_id("default:ice")
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local c_water = minetest.get_content_id("default:water_source")
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local c_papyrus = minetest.get_content_id("default:papyrus")
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local c_sand = minetest.get_content_id("default:sand")
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local vm = minetest.get_voxel_manip()
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local emin, emax = vm:read_from_map(minp, maxp)
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local area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
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local data = vm:get_data()
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local sidelen = x1 - x0 + 1
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local chulens = {x=sidelen, y=sidelen, z=sidelen}
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local minpos = {x=x0, y=z0}
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local nvals_cold = minetest.get_perlin_map(np_cold, chulens):get2dMap_flat({x=x0, y=z0})
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local nvals_ice = minetest.get_perlin_map(np_ice, chulens):get2dMap_flat({x=x0, y=z0})
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-- Choose biomes
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local pr = PseudoRandom(seed+57)
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local biome
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-- Land biomes
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biome = pr:next(1, 5)
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local snowy = biome == 1 -- spawns alot of snow
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local plain = biome == 2 -- spawns not much
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local alpine = biome == 3 -- rocky terrain
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-- Water biomes
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local biome2 = pr:next(1, 5)
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local cool = biome == 1 -- only spawns ice on edge of water
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local icebergs = biome == 2
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local icesheet = biome == 3
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local icecave = biome == 4
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local icehole = biome == 5 -- icesheet with holes
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-- Misc biome settings
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local icy = pr:next(1, 2) == 2 -- if enabled spawns ice in sand instead of snow blocks
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local mossy = pr:next(1,2) == 1 -- spawns moss in snow
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local shrubs = pr:next(1,2) == 1 -- spawns dry shrubs in snow
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local pines = pr:next(1,2) == 1 -- spawns pines
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-- Reseed random
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pr = PseudoRandom(seed+68)
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-- Loop through columns in chunk
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local write_to_map = false
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local ni = 1
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for z = z0, z1 do
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for x = x0, x1 do
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local in_biome = false
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local test = nvals_cold[ni]
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if smooth and (not snowy)
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and (test > 0.73 or (test > 0.43 and pr:next(0,29) > (0.73 - test) * 100 )) then
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in_biome = true
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elseif (not smooth or snowy) and test > 0.53 then
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in_biome = true
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end
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if not in_biome then
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if alpine == true and test > 0.43 then
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local ground_y = nil
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for y = maxp.y, minp.y, -1 do
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local nodid = data[area:index(x, y, z)]
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if nodid ~= c_air
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and nodid ~= c_ignore then
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ground_y = y
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break
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end
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end
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if ground_y then
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local vi = area:index(x, ground_y, z)
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if data[vi] == c_leaves or data[vi] == c_jungleleaves then
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for y = ground_y, -16, -1 do
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local vi = area:index(x, y, z)
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local id = data[vi]
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if id ~= c_air then
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if id == c_leaves
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or id == c_jungleleaves
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or id == c_tree
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or id == c_air
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or id == c_apple then
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data[vi] = c_air
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else
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break
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end
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end
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end
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end
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end
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end
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elseif in_biome then
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write_to_map = true
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local icetype = nvals_ice[ni]
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local cool = icetype > 0
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local icebergs = icetype > -0.2 and icetype <= 0
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local icehole = icetype > -0.4 and icetype <= -0.2
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local icesheet = icetype > -0.6 and icetype <= -0.4
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local icecave = icetype <= -0.6
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local ground_y = nil
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for y = maxp.y, minp.y, -1 do
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local nodid = data[area:index(x, y, z)]
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if nodid ~= c_air and nodid ~= c_ignore then
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ground_y = y
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break
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end
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end
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if ground_y then
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local node = area:index(x, ground_y, z)
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local abovenode = area:index(x, ground_y+1, z)
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local belownode = area:index(x, ground_y-1, z)
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if ground_y and data[node] == c_dirt_with_grass then
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if alpine and test > 0.53 then
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data[abovenode] = c_snow
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for y = ground_y, -6, -1 do
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local vi = area:index(x, y, z)
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if data[vi] == c_stone then
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break
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else
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data[vi] = c_stone
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end
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end
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elseif (shrubs and pr:next(1,28) == 1) then
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data[node] = c_dirt_with_snow
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data[abovenode] = c_dry_shrub
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elseif pines and pr:next(1,36) == 1 then
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data[node] = c_dirt_with_snow
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spawn_pine({x=x, y=ground_y+1, z=z}, area, data)
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elseif snowy and test > 0.63 then
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data[abovenode] = c_snow_block
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else
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data[node] = c_dirt_with_snow
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data[abovenode] = c_snow
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end
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elseif ground_y and data[node] == c_sand then
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if not icy then
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data[abovenode] = c_snow
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else
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data[node] = c_ice
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end
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elseif ground_y and data[node] == c_leaves
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or data[node] == c_jungleleaves or data[node] == c_apple then
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if alpine then
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data[abovenode] = c_snow
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for y = ground_y, -6, -1 do
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local stone = area:index(x, y, z)
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if data[stone] == c_stone then
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break
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else
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data[stone] = c_stone
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end
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end
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else
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data[abovenode] = c_snow
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end
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elseif ground_y and data[node] == c_junglegrass then
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data[node] = c_dry_shrub
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elseif ground_y and data[node] == c_papyrus then
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for y = ground_y, ground_y-4, -1 do
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local vi = area:index(x, y, z)
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if data[vi] == c_papyrus then
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local via = area:index(x, ground_y, z)
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data[via] = c_snow
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data[vi] = c_snow_block
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end
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end
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elseif ground_y and data[node] == c_water then
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if not icesheet and not icecave and not icehole then
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local x1 = data[area:index(x+1, ground_y, z)]
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local z1 = data[area:index(x, ground_y, z+1)]
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local xz1 = data[area:index(x+1, ground_y, z+1)]
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local xz2 = data[area:index(x-1, ground_y, z-1)]
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local x2 = data[area:index(x-1, ground_y, z)]
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local z2 = data[area:index(x, ground_y, z-1)]
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local y = data[area:index(x, ground_y-1, z)]
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local rand = pr:next(1,4) == 1
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if ((x1 and x1 ~= c_water and x1 ~= c_ice
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and x1 ~= c_air and x1 ~= c_ignore)
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or (rand and (cool or icebergs) and x1 == c_ice))
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or ((z1 and z1 ~= c_water and z1 ~= c_ice
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and z1 ~= c_air and z1 ~= c_ignore)
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or (rand and (cool or icebergs) and z1 == c_ice))
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or ((xz1 and xz1 ~= c_water and xz1 ~= c_ice
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and xz1 ~= c_air and xz1 ~= c_ignore)
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or (rand and (cool or icebergs) and xz1 == c_ice))
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or ((xz2 and xz2 ~= c_water and xz2 ~= c_ice
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and xz2 ~= c_air and xz2 ~= c_ignore)
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or (rand and (cool or icebergs) and xz2 == c_ice))
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or ((x2 and x2 ~= c_water and x2 ~= c_ice
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and x2 ~= c_air and x2 ~= c_ignore)
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or (rand and (cool or icebergs) and x2 == c_ice))
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or ((z2 and z2 ~= c_water and z2 ~= c_ice
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and z2 ~= c_air and z2 ~= c_ignore)
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or (rand and (cool or icebergs) and z2 == c_ice))
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or (y ~= c_water and y ~= c_ice) -- and y ~= "air") …I don't think y can be a string here ~HybridDog
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or (icebergs and pr:next(1,6) == 1) then
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data[node] = c_ice
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end
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else
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if (icehole and pr:next(1,10) > 1)
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or icecave or icesheet then
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data[node] = c_ice
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end
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if icecave then
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for y = ground_y-1, -33, -1 do
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local vi = area:index(x, y, z)
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if data[vi] ~= c_water then
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break
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else
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data[vi] = c_air
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end
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end
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end
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end
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end
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end
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end
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ni = ni + 1
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end
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end
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vm:set_data(data)
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vm:set_lighting({day=0, night=0})
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vm:calc_lighting()
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vm:write_to_map()
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if write_to_map and debug then -- print if any column of mapchunk was snow biome
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local biome_string,biome2_string = biome_to_string(biome,biome2)
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local chugent = math.ceil((os.clock() - t1) * 1000)
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print("[snow] "..biome_string.." and "..biome2_string.." x "..minp.x.." z "..minp.z.." time "..chugent.." ms")
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end
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end)
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