VoxeLibre/mods/ENVIRONMENT/weather_pack/weather_core.lua

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weather = {
-- weather states, 'none' is default, other states depends from active mods
state = "none",
-- player list for saving player meta info
players = {},
-- time when weather should be re-calculated
next_check = 0,
-- default weather recalculation interval
check_interval = 300,
-- weather min duration
min_duration = 240,
-- weather max duration
max_duration = 3600,
-- weather calculated end time
end_time = nil,
-- registered weathers
reg_weathers = {},
-- automaticly calculates intervals and swap weathers
auto_mode = true,
-- global flag to disable/enable ABM logic.
allow_abm = true,
}
weather.get_rand_end_time = function(min_duration, max_duration)
if min_duration ~= nil and max_duration ~= nil then
return os.time() + math.random(min_duration, max_duration);
else
return os.time() + math.random(weather.min_duration, weather.max_duration);
end
end
weather.is_outdoor = function(pos)
if minetest.get_node_light({x=pos.x, y=pos.y + 1, z=pos.z}, 0.5) == 15 then
return true
end
return false
end
-- checks if player is undewater. This is needed in order to
-- turn off weather particles generation.
weather.is_underwater = function(player)
local ppos = player:getpos()
local offset = player:get_eye_offset()
local player_eye_pos = {x = ppos.x + offset.x,
y = ppos.y + offset.y + 1.5,
z = ppos.z + offset.z}
local node_level = minetest.get_node_level(player_eye_pos)
if node_level == 8 or node_level == 7 then
return true
end
return false
end
-- trying to locate position for particles by player look direction for performance reason.
-- it is costly to generate many particles around player so goal is focus mainly on front view.
weather.get_random_pos_by_player_look_dir = function(player)
local look_dir = player:get_look_dir()
local player_pos = player:getpos()
local random_pos_x = 0
local random_pos_y = 0
local random_pos_z = 0
if look_dir.x > 0 then
if look_dir.z > 0 then
random_pos_x = math.random() + math.random(player_pos.x - 2.5, player_pos.x + 5)
random_pos_z = math.random() + math.random(player_pos.z - 2.5, player_pos.z + 5)
else
random_pos_x = math.random() + math.random(player_pos.x - 2.5, player_pos.x + 5)
random_pos_z = math.random() + math.random(player_pos.z - 5, player_pos.z + 2.5)
end
else
if look_dir.z > 0 then
random_pos_x = math.random() + math.random(player_pos.x - 5, player_pos.x + 2.5)
random_pos_z = math.random() + math.random(player_pos.z - 2.5, player_pos.z + 5)
else
random_pos_x = math.random() + math.random(player_pos.x - 5, player_pos.x + 2.5)
random_pos_z = math.random() + math.random(player_pos.z - 5, player_pos.z + 2.5)
end
end
random_pos_y = math.random() + math.random(player_pos.y + 1, player_pos.y + 3)
return random_pos_x, random_pos_y, random_pos_z
end
minetest.register_globalstep(function(dtime)
if weather.auto_mode == false then
return 0
end
-- recalculate weather only when there aren't currently any
if (weather.state ~= "none") then
if (weather.end_time ~= nil and weather.end_time <= os.time()) then
weather.reg_weathers[weather.state].clear()
weather.state = "none"
end
elseif (weather.next_check <= os.time()) then
for weather_name, weather_meta in pairs(weather.reg_weathers) do
weather.set_random_weather(weather_name, weather_meta)
end
-- fallback next_check set, weather 'none' will be.
weather.next_check = os.time() + weather.check_interval
end
end)
-- sets random weather (which could be 'regular' (no weather)).
weather.set_random_weather = function(weather_name, weather_meta)
if weather.next_check > os.time() then return 0 end
if (weather_meta ~= nil and weather_meta.chance ~= nil) then
local random_roll = math.random(0,100)
if (random_roll <= weather_meta.chance) then
weather.state = weather_name
weather.end_time = weather.get_rand_end_time(weather_meta.min_duration, weather_meta.max_duration)
weather.next_check = os.time() + weather.check_interval
end
end
end
minetest.register_privilege("weather_manager", {
description = "Gives ability to control weather",
give_to_singleplayer = false
})
-- Weather command definition. Set
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minetest.register_chatcommand("weather", {
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params = "clear | rain | snow | thunder",
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description = "Changes the weather to the specified parameter.",
privs = {weather_manager = true},
func = function(name, param)
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if (param == "clear") then
if (weather.state ~= nil and weather.reg_weathers[weather.state] ~= nil) then
weather.reg_weathers[weather.state].clear()
weather.state = param
end
weather.state = "none"
end
if (weather.reg_weathers ~= nil and weather.reg_weathers[param] ~= nil) then
if (weather.state ~= nil and weather.state ~= "none" and weather.reg_weathers[weather.state] ~= nil) then
weather.reg_weathers[weather.state].clear()
end
weather.state = param
end
end
})
-- Configuration setting which allows user to disable ABM for weathers (if they use it).
-- Weather mods expected to be use this flag before registering ABM.
local weather_allow_abm = minetest.setting_getbool("weather_allow_abm")
if weather_allow_abm ~= nil and weather_allow_abm == false then
weather.allow_abm = false
end
-- Overrides nodes 'sunlight_propagates' attribute for efficient indoor check (e.g. for glass roof).
-- Controlled from minetest.conf setting and by default it is disabled.
-- To enable set weather_allow_override_nodes to true.
-- Only new nodes will be effected (glass roof needs to be rebuilded).
if minetest.setting_getbool("weather_allow_override_nodes") then
if minetest.registered_nodes["default:glass"] then
minetest.override_item("default:glass", {sunlight_propagates = false})
end
if minetest.registered_nodes["default:meselamp"] then
minetest.override_item("default:meselamp", {sunlight_propagates = false})
end
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end