forked from mtcontrib/minetest-mod-snow
273 lines
6.3 KiB
Lua
273 lines
6.3 KiB
Lua
--[[
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--=================
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--======================================
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LazyJ's Fork of Splizard's "Snow" Mod
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by LazyJ
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version: Umpteen and 7/5ths something or another.
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2014_04_12
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--======================================
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--=================
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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THE LIST OF CHANGES I'VE MADE
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* Falling snow would destroy nodes it deposited snow on. I figured out that if
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I switched the 'snow.place' with 'minetest.place_node' and increased the
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y position by 2, then the nodes were nolonger destroyed and the snow
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would start to pile up.
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~~~~~~
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TODO
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~~~~~~
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* Add code to prevent snowfall from depositing snow on or
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near torches and lava.
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* Add code to prevent snowfall from depositing snow on
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'walkable = false' defined nodes.
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both are already fixed -- Hybrid Dog
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--]]
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--=============================================================
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-- CODE STUFF
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--=============================================================
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local weather_legacy
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local worldpath = minetest.get_worldpath()
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local read_weather_legacy = function ()
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local file = io.open(worldpath.."/weather_v6", "r")
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if not file then return end
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local readweather = file:read()
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file:close()
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return readweather
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end
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--Weather for legacy versions of minetest.
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local save_weather_legacy = function ()
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local file = io.open(worldpath.."/weather_v6", "w+")
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file:write(weather_legacy)
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file:close()
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end
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weather_legacy = read_weather_legacy() or ""
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local timer = 0
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minetest.register_globalstep(function(dtime)
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timer = timer+dtime
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if timer < 2 then
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return
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end
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timer = 0
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if weather_legacy == "snow" then
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if math.random(1000) == 1 then
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weather_legacy = "none"
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save_weather_legacy()
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end
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elseif math.random(5000) == 2 then
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weather_legacy = "snow"
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save_weather_legacy()
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end
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end)
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local function infolog(msg)
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minetest.log("info", "[snow] falling_snow: "..msg)
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end
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-- copied from meru mod
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local SEEDDIFF3 = 9130 -- 9130 -- Values should match minetest mapgen desert perlin.
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local OCTAVES3 = 3 -- 3
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local PERSISTENCE3 = 0.5 -- 0.5
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local SCALE3 = 250 -- 250
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--Get snow at position.
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local rarity, perlin_scale
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local function get_snow(pos)
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--Legacy support.
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if weather_legacy ~= "snow" then
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return false
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end
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if not rarity then
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rarity = snow.mapgen.smooth_rarity_min
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perlin_scale = snow.mapgen.perlin_scale
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end
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local perlin1 = minetest.get_perlin(112,3, 0.5, perlin_scale)
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if perlin1:get2d({x=pos.x, y=pos.z}) < rarity then
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return false
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end
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-- disable falling snow in desert
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local desert_perlin = minetest.get_perlin(SEEDDIFF3, OCTAVES3, PERSISTENCE3, SCALE3)
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local noise3 = desert_perlin:get2d({x=pos.x+150,y=pos.z+50}) -- Offsets must match minetest mapgen desert perlin.
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if noise3 > 0.35 then -- Smooth transition 0.35 to 0.45.
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return false
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end
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return true
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end
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local addvectors = vector.add
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--Returns a random position between minp and maxp.
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local function randpos(minp, maxp)
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local x,z
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if minp.x > maxp.x then
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x = math.random(maxp.x,minp.x)
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else
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x = math.random(minp.x,maxp.x)
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end
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if minp.z > maxp.z then
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z = math.random(maxp.z,minp.z)
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else
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z = math.random(minp.z,maxp.z)
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end
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return {x=x,y=minp.y,z=z}
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end
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local default_snow_particle = {
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amount = 3,
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time = 0.5,
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exptime = 5,
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size = 50,
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collisiondetection = false,
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vertical = false,
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}
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local function get_snow_particledef(data)
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for n,i in pairs(default_snow_particle) do
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data[n] = data[n] or i
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end
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for _,i in pairs({"vel", "acc", "exptime", "size"}) do
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data["min"..i] = data[i]
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data["max"..i] = data[i]
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end
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data.texture = "weather_snow.png^[transform"..math.random(0,7)
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return data
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end
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local function snow_fall(pos, player, animate)
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local ground_y = nil
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for y=pos.y+10,pos.y+20,1 do
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local n = minetest.get_node({x=pos.x,y=y,z=pos.z}).name
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if n ~= "air" and n ~= "ignore" then
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return
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end
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end
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for y=pos.y+9,pos.y-15,-1 do
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local n = minetest.get_node({x=pos.x,y=y,z=pos.z}).name
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if n ~= "air" and n ~= "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 not ground_y then
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return
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end
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pos = {x=pos.x, y=ground_y, z=pos.z}
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if not get_snow(pos) then
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return
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end
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if animate then
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local spos = {x=pos.x, y=ground_y+10, z=pos.z}
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minetest.add_particlespawner(get_snow_particledef({
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minpos = addvectors(spos, {x=-9, y=3, z=-9}),
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maxpos = addvectors(spos, {x= 9, y=5, z= 9}),
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vel = {x=0, y=-1, z=-1},
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acc = {x=0, y=0, z=0},
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playername = player:get_player_name()
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}))
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end
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snow.place(pos, true)
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--minetest.place_node({x=pos.x, y=pos.y+2, z=pos.z}, {name="default:snow"}) -- LazyJ
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end
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-- Snow
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local lighter_snowfall = snow.lighter_snowfall
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local function calc_snowfall()
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for _, player in pairs(minetest.get_connected_players()) do
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local ppos = player:getpos()
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-- Make sure player is not in a cave/house...
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if get_snow(ppos)
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and minetest.get_node_light(ppos, 0.5) == 15 then
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local animate
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if not lighter_snowfall then
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local vel = {x=0, y=-1, z=-1}
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local acc = {x=0, y=0, z=0}
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minetest.add_particlespawner(get_snow_particledef({
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amount = 5,
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minpos = addvectors(ppos, {x=-9, y=3, z=-9}),
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maxpos = addvectors(ppos, {x= 9, y=5, z= 9}),
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vel = vel,
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acc = acc,
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size = 25,
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playername = player:get_player_name()
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}))
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minetest.add_particlespawner(get_snow_particledef({
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amount = 4,
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minpos = addvectors(ppos, {x=-5, y=3.2, z=-5}),
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maxpos = addvectors(ppos, {x= 5, y=1.6, z= 5}),
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vel = vel,
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acc = acc,
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exptime = 4,
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size = 25,
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playername = player:get_player_name()
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}))
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animate = false
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else
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animate = true
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end
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if math.random(1,5) == 4 then
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snow_fall(
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randpos(
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addvectors(ppos, {x=-20, y=0, z=-20}),
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addvectors(ppos, {x= 20, y=0, z= 20})
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),
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player,
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animate
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)
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end
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end
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end
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end
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local step_func
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minetest.register_globalstep(function()
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step_func()
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end)
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if snow.enable_snowfall then
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step_func = calc_snowfall
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infolog("step function set to calc_snowfall")
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else
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step_func = function() end
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infolog("step function set to empty function")
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end
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snow.register_on_configuring(function(name, v)
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if name == "enable_snowfall" then
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if v then
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step_func = calc_snowfall
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infolog("step function set to calc_snowfall")
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else
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step_func = function() end
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infolog("step function set to empty function")
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end
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elseif name == "lighter_snowfall" then
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lighter_snowfall = v
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end
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end)
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