weather_pack/weather_core/init.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
known_weathers = {}
}
weather.get_rand_end_time = function()
return os.time() + math.random(weather.min_duration, weather.max_duration);
end
-- checks if player is undewater. This is needed in order to
-- turn off weather particles generation.
function is_underwater(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}
if minetest.get_node_level(player_eye_pos) == 8 then
return true
end
return false
end
-- returns random number between a and b.
function random_pos(a, b)
if (a > b) then
return math.random(b, a);
end
return math.random(a, b);
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.
function get_random_pos_by_player_look_dir(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 + 10)
random_pos_z = math.random() + math.random(player_pos.z - 2.5, player_pos.z + 10)
else
random_pos_x = math.random() + math.random(player_pos.x - 2.5, player_pos.x + 10)
random_pos_z = math.random() + math.random(player_pos.z - 10, player_pos.z + 2.5)
end
else
if look_dir.z > 0 then
random_pos_x = math.random() + math.random(player_pos.x - 10, player_pos.x + 2.5)
random_pos_z = math.random() + math.random(player_pos.z - 2.5, player_pos.z + 10)
else
random_pos_x = math.random() + math.random(player_pos.x - 10, player_pos.x + 2.5)
random_pos_z = math.random() + math.random(player_pos.z - 10, player_pos.z + 2.5)
end
end
random_pos_y = math.random() + random_pos(player_pos.y + 1, player_pos.y + 7)
return random_pos_x, random_pos_y, random_pos_z
end
minetest.register_globalstep(function(dtime)
-- 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.known_weathers[weather.state].clear()
weather.state = "none"
end
end
if (weather.next_check <= os.time()) then
for reg_weather_name, reg_weather_obj in pairs(weather.known_weathers) do
if (reg_weather_obj ~= nil and reg_weather_obj.chance ~= nil) then
local random_roll = math.random(0,100)
if (random_roll <= reg_weather_obj.chance) then
weather.state = reg_weather_name
weather.end_time = weather.get_rand_end_time()
end
end
end
weather.next_check = os.time() + weather.check_interval
end
end)
minetest.register_privilege("weather_manager", {
description = "Gives ability to control weather",
give_to_singleplayer = false
})
-- Weather command definition. Set
minetest.register_chatcommand("set_weather", {
params = "<weather>",
description = "Changes weather by given param, parameter none will remove weather.",
privs = {rain_manager = true},
func = function(name, param)
if (param == "none") then
if (weather.state ~= nil and weather.known_weathers[weather.state] ~= nil) then
weather.known_weathers[weather.state].clear()
weather.state = param
end
weather.state = "none"
end
if (weather.known_weathers ~= nil and weather.known_weathers[param] ~= nil) then
if (weather.state ~= nil and weather.state ~= "none" and weather.known_weathers[weather.state] ~= nil) then
weather.known_weathers[weather.state].clear()
end
weather.state = param
end
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
end