climate_api/lib/api.lua
2020-05-12 16:00:24 +02:00

103 lines
3.6 KiB
Lua

-- initialize API interface
local api = {}
-- define various standard effect cycle lengths
api.SHORT_CYCLE = 0 -- for particles and fast animations (use GSCYCLE)
api.DEFAULT_CYCLE = 2.0 -- for most effect types
api.LONG_CYCLE = 5.0 -- for ressource intensive tasks or timed effects
-- register new weather presets (like rain)
-- @param name <string> Unique preset name, ideally prefixed
-- @param conditions <table> A collection of required influences
-- @param effects <table> A <table> containing all applied effects as keys and parameters as values
function api.register_weather(name, conditions, effects)
climate_mod.weathers[name] = {
conditions = conditions,
effects = effects,
active_players = {}
}
end
-- register new weather effects (like particles)
-- @param name <string> Unique effect name, ideally prefixed
-- @param handler <function> A function to be called when the effect is active
-- @param htype <string: start|tick|stop> Determines when the function is called
function api.register_effect(name, handler, htype)
-- check for valid handler types
if htype ~= "start" and htype ~= "tick" and htype ~= "stop" then
minetest.log("warning", "[Climate API] Effect " .. dump(name) .. " uses invalid callback type: " .. dump(htype))
return
end
-- create effect handler registry if not existent yet
if type(climate_mod.effects[name]) == "nil" then
climate_mod.effects[name] = { start = {}, tick = {}, stop = {} }
climate_mod.cycles[name] = { timespan = api.DEFAULT_CYCLE, timer = 0 }
end
-- store effect handler
table.insert(climate_mod.effects[name][htype], handler)
end
-- set cycle length of given effect
-- @param name <string> Name of the affected effect
-- @param cycle <number> Duration between function calls
function api.set_effect_cycle(name, cycle)
climate_mod.cycles[name].timespan = cycle
end
-- register new environment influence that is independent of position
-- @param name <string> Unique influence name
-- @param func <function> Returns current influence value for entire world
function api.register_global_influence(name, func)
climate_mod.global_influences[name] = func
end
-- register new environment influence based on position
-- @param name <string> Unique influence name
-- @param func <function> Returns current influence value for given position
function api.register_influence(name, func)
climate_mod.influences[name] = func
end
-- register new Active Block Modifier dependent on weather status
-- Uses same config as Minetest.register_abm() but also adds
-- conditions similiar to weather presets and provides local environment
-- to action event handler as third parameter.
-- @param config <table> ABM configuration with additional information
function api.register_abm(config)
if not climate_mod.settings.block_updates then return end
local conditions = config.conditions
local action = config.action
local pos_override = config.pos_override
-- override action handler to inject weather status
local override = function(pos, node)
if type(pos_override) == "function" then
pos = pos_override(pos)
node = minetest.get_node(pos)
end
-- get environment influences for current position
local env = climate_mod.trigger.get_position_environment(pos)
if conditions == nil then
return action(pos, node, env)
end
-- check if all conditions are met
for condition, goal in pairs(conditions) do
local is_applicable = climate_mod.trigger.test_condition(condition, env, goal)
if not is_applicable then return end
end
return action(pos, node, env)
end
-- register overridden abm setup
config.conditions = nil
config.action = override
minetest.register_abm(config)
end
-- return supplied API endpoint
return api