291 lines
8.2 KiB
Lua
291 lines
8.2 KiB
Lua
-- Parameters
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local YWATER = 1 -- Normally set this to world's water level
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-- Particles are timed to disappear at this y
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-- Particles are not spawned for players below this y
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-- Rain sound is not played for players below this y
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local YMIN = -48 -- Normally set this to deepest ocean
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local YMAX = 120 -- Normally set this to cloud level
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-- Weather does not occur for players outside this y range
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local PRECTIM = 300 -- Precipitation noise 'spread'
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-- Time scale for precipitation variation, in seconds
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local PRECTHR = 0.2 -- Precipitation noise threshold, -1 to 1:
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-- -1 = precipitation all the time
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-- 0 = precipitation half the time
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-- 1 = no precipitation
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local FLAKLPOS = 32 -- Snowflake light-tested positions per 0.5s cycle
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-- Maximum number of snowflakes spawned per 0.5s
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local DROPLPOS = 64 -- Raindrop light-tested positions per 0.5s cycle
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local DROPPPOS = 2 -- Number of raindrops spawned per light-tested position
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local RAINGAIN = 0.2 -- Rain sound volume
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local NISVAL = 39 -- Overcast sky RGB value at night (brightness)
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local DASVAL = 159 -- Overcast sky RGB value in daytime (brightness)
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local FLAKRAD = 16 -- Radius in which flakes are created
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local DROPRAD = 16 -- Radius in which drops are created
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-- Precipitation noise
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local np_prec = {
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offset = 0,
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scale = 1,
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spread = {x = PRECTIM, y = PRECTIM, z = PRECTIM},
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seed = 813,
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octaves = 1,
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persist = 0,
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lacunarity = 2.0,
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flags = "defaults"
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}
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-- These 2 must match biome heat and humidity noise parameters for a world
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local np_temp = {
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offset = 50,
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scale = 50,
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spread = {x = 1000, y = 1000, z = 1000},
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seed = 5349,
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octaves = 3,
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persist = 0.5,
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lacunarity = 2.0,
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flags = "defaults"
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}
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local np_humid = {
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offset = 50,
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scale = 50,
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spread = {x = 1000, y = 1000, z = 1000},
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seed = 842,
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octaves = 3,
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persist = 0.5,
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lacunarity = 2.0,
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flags = "defaults"
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}
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-- End parameters
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-- Some stuff
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local difsval = DASVAL - NISVAL
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local grad = 14 / 95
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local yint = 1496 / 95
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-- Initialise noise objects to nil
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local nobj_temp = nil
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local nobj_humid = nil
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local nobj_prec = nil
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-- Player tables
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local handles = {}
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local skybox = {} -- true/false. To not turn off skyboxes of other mods
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-- Globalstep function
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local os_time_0 = os.time()
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local t_offset = math.random(0, 300000)
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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 < 0.5 then
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return
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end
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timer = 0
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for _, player in ipairs(minetest.get_connected_players()) do
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local player_name = player:get_player_name()
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local ppos = player:getpos()
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-- Point just above player head, to ensure precipitation when swimming
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local pposy = math.floor(ppos.y) + 2
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if pposy >= YMIN and pposy <= YMAX then
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local pposx = math.floor(ppos.x)
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local pposz = math.floor(ppos.z)
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local ppos = {x = pposx, y = pposy, z = pposz}
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-- Heat, humidity and precipitation noises
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-- Time in seconds.
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-- Add the per-server-session random time offset to avoid identical behaviour
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-- each server session.
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local time = os.difftime(os.time(), os_time_0) - t_offset
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local nobj_temp = nobj_temp or minetest.get_perlin(np_temp)
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local nobj_humid = nobj_humid or minetest.get_perlin(np_humid)
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local nobj_prec = nobj_prec or minetest.get_perlin(np_prec)
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local nval_temp = nobj_temp:get2d({x = pposx, y = pposz})
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local nval_humid = nobj_humid:get2d({x = pposx, y = pposz})
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local nval_prec = nobj_prec:get2d({x = time, y = 0})
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-- Default Minetest Game biome system:
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-- Frozen biomes below heat 35
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-- deserts below line 14 * t - 95 * h = -1496
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-- h = (14 * t + 1496) / 95
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-- h = 14/95 * t + 1496/95
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-- where 14/95 is gradient and 1496/95 is 'y-intersection'
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-- h - 14/95 * t = 1496/95
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-- so area above line is
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-- h - 14/95 * t > 1496/95
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local freeze = nval_temp < 35
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local precip = nval_prec > PRECTHR and
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nval_humid - grad * nval_temp > yint
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-- Set sky
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if precip and not skybox[player_name] then
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-- Set overcast sky only if normal
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local sval
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local time = minetest.get_timeofday()
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if time >= 0.5 then
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time = 1 - time
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end
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-- Sky brightness transitions:
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-- First transition (24000 -) 4500, (1 -) 0.1875
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-- Last transition (24000 -) 5750, (1 -) 0.2396
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if time <= 0.1875 then
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sval = NISVAL
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elseif time >= 0.2396 then
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sval = DASVAL
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else
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sval = math.floor(NISVAL +
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((time - 0.1875) / 0.0521) * difsval)
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end
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player:set_sky({r = sval, g = sval, b = sval + 16, a = 255},
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"plain", {}, false)
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skybox[player_name] = true
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elseif not precip and skybox[player_name] then
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-- Set normal sky only if skybox
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player:set_sky({}, "regular", {}, true)
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skybox[player_name] = nil
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end
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-- Stop looping sound.
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-- Stop sound if head below water level.
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if not precip or freeze or pposy < YWATER then
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if handles[player_name] then
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minetest.sound_stop(handles[player_name])
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handles[player_name] = nil
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end
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end
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-- Particles and sounds.
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-- Only if head above water level.
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if precip and pposy >= YWATER then
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if freeze then
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-- Snowfall particles
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for lpos = 1, FLAKLPOS do
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local lposx = pposx - FLAKRAD +
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math.random(0, FLAKRAD * 2)
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local lposz = pposz - FLAKRAD +
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math.random(0, FLAKRAD * 2)
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if minetest.get_node_light(
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{x = lposx, y = pposy + 10, z = lposz},
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0.5) == 15 then
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-- Any position above light-tested position is also
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-- light level 15.
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-- Spawn Y randomised to avoid particles falling
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-- in separated layers.
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-- Random range = speed * cycle time
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local spawny = pposy + 10 + math.random(0, 10) / 10
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local extime = math.min((spawny - YWATER) / 2, 10)
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minetest.add_particle({
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pos = {x = lposx, y = spawny, z = lposz},
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velocity = {x = 0, y = -2.0, z = 0},
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acceleration = {x = 0, y = 0, z = 0},
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expirationtime = extime,
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size = 2.8,
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collisiondetection = true,
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collision_removal = true,
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vertical = false,
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texture = "snowdrift_snowflake" ..
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math.random(1, 12) .. ".png",
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playername = player:get_player_name()
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})
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end
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end
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else
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-- Rainfall particles
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for lpos = 1, DROPLPOS do
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local lposx = pposx - DROPRAD +
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math.random(0, DROPRAD * 2)
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local lposz = pposz - DROPRAD +
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math.random(0, DROPRAD * 2)
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if minetest.get_node_light(
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{x = lposx, y = pposy + 10, z = lposz},
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0.5) == 15 then
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for drop = 1, DROPPPOS do
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local spawny = pposy + 10 + math.random(0, 60) / 10
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local extime = math.min((spawny - YWATER) / 12, 2)
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local spawnx = lposx - 0.4 + math.random(0, 8) / 10
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local spawnz = lposz - 0.4 + math.random(0, 8) / 10
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minetest.add_particle({
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pos = {x = spawnx, y = spawny, z = spawnz},
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velocity = {x = 0.0, y = -12.0, z = 0.0},
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acceleration = {x = 0, y = 0, z = 0},
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expirationtime = extime,
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size = 2.8,
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collisiondetection = true,
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collision_removal = true,
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vertical = true,
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texture = "snowdrift_raindrop.png",
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playername = player:get_player_name()
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})
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end
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end
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end
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-- Start looping sound
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if not handles[player_name] then
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local handle = minetest.sound_play(
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"snowdrift_rain",
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{
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to_player = player_name,
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gain = RAINGAIN,
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loop = true,
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}
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)
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if handle then
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handles[player_name] = handle
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end
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end
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end
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end
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else
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-- Player outside y limits.
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-- Stop sound if playing.
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if handles[player_name] then
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minetest.sound_stop(handles[player_name])
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handles[player_name] = nil
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end
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-- Set normal sky if skybox
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if skybox[player_name] then
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player:set_sky({}, "regular", {}, true)
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skybox[player_name] = nil
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end
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end
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end
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end)
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-- On leaveplayer function
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minetest.register_on_leaveplayer(function(player)
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local player_name = player:get_player_name()
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-- Stop sound if playing and remove handle
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if handles[player_name] then
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minetest.sound_stop(handles[player_name])
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handles[player_name] = nil
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end
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-- Remove skybox bool if necessary
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if skybox[player_name] then
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skybox[player_name] = nil
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end
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end)
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