365 lines
11 KiB
Lua
365 lines
11 KiB
Lua
local S = minetest.get_translator("mcl_comparators")
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-- Functions that get the input/output rules of the comparator
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local comparator_get_output_rules = function(node)
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local rules = {{x = -1, y = 0, z = 0, spread=true}}
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for i = 0, node.param2 do
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rules = mesecon.rotate_rules_left(rules)
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end
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return rules
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end
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local comparator_get_input_rules = function(node)
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local rules = {
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-- we rely on this order in update_self below
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{x = 1, y = 0, z = 0}, -- back
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{x = 0, y = 0, z = -1}, -- side
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{x = 0, y = 0, z = 1}, -- side
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}
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for i = 0, node.param2 do
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rules = mesecon.rotate_rules_left(rules)
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end
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return rules
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end
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-- Functions that are called after the delay time
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local comparator_turnon = function(params)
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local rules = comparator_get_output_rules(params.node)
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mesecon.receptor_on(params.pos, rules)
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end
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local comparator_turnoff = function(params)
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local rules = comparator_get_output_rules(params.node)
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mesecon.receptor_off(params.pos, rules)
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end
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-- Functions that set the correct node type an schedule a turnon/off
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local comparator_activate = function(pos, node)
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local def = minetest.registered_nodes[node.name]
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local onstate = def.comparator_onstate
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if onstate then
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minetest.swap_node(pos, { name = onstate, param2 = node.param2 })
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end
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minetest.after(0.1, comparator_turnon , {pos = pos, node = node})
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end
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local comparator_deactivate = function(pos, node)
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local def = minetest.registered_nodes[node.name]
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local offstate = def.comparator_offstate
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if offstate then
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minetest.swap_node(pos, { name = offstate, param2 = node.param2 })
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end
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minetest.after(0.1, comparator_turnoff, {pos = pos, node = node})
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end
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-- weather pos has an inventory that contains at least one item
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local container_inventory_nonempty = function(pos)
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local invnode = minetest.get_node(pos)
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local invnodedef = minetest.registered_nodes[invnode.name]
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-- Ignore stale nodes
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if not invnodedef then return false end
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-- Only accept containers. When a container is dug, it's inventory
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-- seems to stay. and we don't want to accept the inventory of an air
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-- block
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if not invnodedef.groups.container then return false end
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local inv = minetest.get_inventory({type="node", pos=pos})
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if not inv then return false end
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for listname, _ in pairs(inv:get_lists()) do
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if not inv:is_empty(listname) then return true end
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end
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return false
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end
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-- weather pos has an constant signal output for the comparator
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local static_signal_output = function(pos)
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local node = minetest.get_node(pos)
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local g = minetest.get_item_group(node.name, "comparator_signal")
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return g > 0
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end
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-- whether the comparator should be on according to its inputs
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local comparator_desired_on = function(pos, node)
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local my_input_rules = comparator_get_input_rules(node);
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local back_rule = my_input_rules[1]
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local state
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if back_rule then
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local back_pos = vector.add(pos, back_rule)
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state = mesecon.is_power_on(back_pos) or container_inventory_nonempty(back_pos) or static_signal_output(back_pos)
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end
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-- if back input if off, we don't need to check side inputs
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if not state then return false end
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-- without power levels, side inputs have no influence on output in compare
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-- mode
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local mode = minetest.registered_nodes[node.name].comparator_mode
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if mode == "comp" then return state end
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-- subtract mode, subtract max(side_inputs) from back input
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local side_state = false
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for ri = 2,3 do
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if my_input_rules[ri] then
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side_state = mesecon.is_power_on(vector.add(pos, my_input_rules[ri]))
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end
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if side_state then break end
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end
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-- state is known to be true
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return not side_state
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end
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-- update comparator state, if needed
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local update_self = function(pos, node)
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node = node or minetest.get_node(pos)
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local old_state = mesecon.is_receptor_on(node.name)
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local new_state = comparator_desired_on(pos, node)
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if new_state ~= old_state then
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if new_state then
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comparator_activate(pos, node)
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else
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comparator_deactivate(pos, node)
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end
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end
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end
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-- compute tile depending on state and mode
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local get_tiles = function(state, mode)
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local top = "mcl_comparators_"..state..".png^"..
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"mcl_comparators_"..mode..".png"
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local sides = "mcl_comparators_sides_"..state..".png^"..
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"mcl_comparators_sides_"..mode..".png"
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local ends = "mcl_comparators_ends_"..state..".png^"..
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"mcl_comparators_ends_"..mode..".png"
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return {
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top, "mcl_stairs_stone_slab_top.png",
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sides, sides.."^[transformFX",
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ends, ends,
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}
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end
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-- Given one mode, get the other mode
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local flipmode = function(mode)
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if mode == "comp" then return "sub"
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elseif mode == "sub" then return "comp"
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end
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end
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local make_rightclick_handler = function(state, mode)
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local newnodename =
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"mcl_comparators:comparator_"..state.."_"..flipmode(mode)
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return function (pos, node, clicker)
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local protname = clicker:get_player_name()
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if minetest.is_protected(pos, protname) then
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minetest.record_protection_violation(pos, protname)
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return
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end
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minetest.swap_node(pos, {name = newnodename, param2 = node.param2 })
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end
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end
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-- Register the 2 (states) x 2 (modes) comparators
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local icon = "mcl_comparators_item.png"
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local node_boxes = {
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comp = {
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{ -8/16, -8/16, -8/16,
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8/16, -6/16, 8/16 }, -- the main slab
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{ -1/16, -6/16, 6/16,
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1/16, -4/16, 4/16 }, -- front torch
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{ -4/16, -6/16, -5/16,
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-2/16, -1/16, -3/16 }, -- left back torch
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{ 2/16, -6/16, -5/16,
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4/16, -1/16, -3/16 }, -- right back torch
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},
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sub = {
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{ -8/16, -8/16, -8/16,
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8/16, -6/16, 8/16 }, -- the main slab
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{ -1/16, -6/16, 6/16,
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1/16, -3/16, 4/16 }, -- front torch (active)
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{ -4/16, -6/16, -5/16,
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-2/16, -1/16, -3/16 }, -- left back torch
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{ 2/16, -6/16, -5/16,
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4/16, -1/16, -3/16 }, -- right back torch
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},
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}
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local collision_box = {
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type = "fixed",
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fixed = { -8/16, -8/16, -8/16, 8/16, -6/16, 8/16 },
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}
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local state_strs = {
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[ mesecon.state.on ] = "on",
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[ mesecon.state.off ] = "off",
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}
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local groups = {
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dig_immediate = 3,
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dig_by_water = 1,
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destroy_by_lava_flow = 1,
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dig_by_piston = 1,
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attached_node = 1,
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}
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local on_rotate
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if minetest.get_modpath("screwdriver") then
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on_rotate = screwdriver.disallow
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end
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for _, mode in pairs{"comp", "sub"} do
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for _, state in pairs{mesecon.state.on, mesecon.state.off} do
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local state_str = state_strs[state]
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local nodename =
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"mcl_comparators:comparator_"..state_strs[state].."_"..mode
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-- Help
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local longdesc, usagehelp, use_help
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if state_strs[state] == "off" and mode == "comp" then
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longdesc = S("Redstone comparators are multi-purpose redstone components.").."\n"..
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S("They can transmit a redstone signal, detect whether a block contains any items and compare multiple signals.")
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usagehelp = S("A redstone comparator has 1 main input, 2 side inputs and 1 output. The output is in arrow direction, the main input is in the opposite direction. The other 2 sides are the side inputs.").."\n"..
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S("The main input can powered in 2 ways: First, it can be powered directly by redstone power like any other component. Second, it is powered if, and only if a container (like a chest) is placed in front of it and the container contains at least one item.").."\n"..
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S("The side inputs are only powered by normal redstone power. The redstone comparator can operate in two modes: Transmission mode and subtraction mode. It starts in transmission mode and the mode can be changed by using the block.").."\n\n"..
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S("Transmission mode:\nThe front torch is unlit and lowered. The output is powered if, and only if the main input is powered. The two side inputs are ignored.").."\n"..
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S("Subtraction mode:\nThe front torch is lit. The output is powered if, and only if the main input is powered and none of the side inputs is powered.")
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else
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use_help = false
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end
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local nodedef = {
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description = S("Redstone Comparator"),
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inventory_image = icon,
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wield_image = icon,
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_doc_items_create_entry = use_help,
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_doc_items_longdesc = longdesc,
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_doc_items_usagehelp = usagehelp,
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drawtype = "nodebox",
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tiles = get_tiles(state_strs[state], mode),
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use_texture_alpha = minetest.features.use_texture_alpha_string_modes and "opaque" or false,
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wield_image = "mcl_comparators_off.png",
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walkable = true,
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selection_box = collision_box,
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collision_box = collision_box,
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node_box = {
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type = "fixed",
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fixed = node_boxes[mode],
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},
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groups = groups,
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paramtype = "light",
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paramtype2 = "facedir",
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sunlight_propagates = false,
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is_ground_content = false,
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drop = 'mcl_comparators:comparator_off_comp',
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on_construct = update_self,
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on_rightclick =
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make_rightclick_handler(state_strs[state], mode),
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comparator_mode = mode,
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comparator_onstate = "mcl_comparators:comparator_on_"..mode,
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comparator_offstate = "mcl_comparators:comparator_off_"..mode,
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sounds = mcl_sounds.node_sound_stone_defaults(),
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mesecons = {
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receptor = {
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state = state,
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rules = comparator_get_output_rules,
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},
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effector = {
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rules = comparator_get_input_rules,
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action_change = update_self,
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}
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},
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on_rotate = on_rotate,
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}
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if mode == "comp" and state == mesecon.state.off then
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-- This is the prototype
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nodedef._doc_items_create_entry = true
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else
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nodedef.groups = table.copy(nodedef.groups)
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nodedef.groups.not_in_creative_inventory = 1
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local extra_desc = {}
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if mode == "sub" or state == mesecon.state.on then
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nodedef.inventory_image = nil
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end
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local desc = nodedef.description
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if mode ~= "sub" and state == mesecon.state.on then
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desc = S("Redstone Comparator (Powered)")
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elseif mode == "sub" and state ~= mesecon.state.on then
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desc = S("Redstone Comparator (Subtract)")
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elseif mode == "sub" and state == mesecon.state.on then
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desc = S("Redstone Comparator (Subtract, Powered)")
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end
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nodedef.description = desc
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end
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minetest.register_node(nodename, nodedef)
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end
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end
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-- Register recipies
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local rstorch = "mesecons_torch:mesecon_torch_on"
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local quartz = "mcl_nether:quartz"
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local stone = "mcl_core:stone"
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minetest.register_craft({
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output = "mcl_comparators:comparator_off_comp",
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recipe = {
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{ "", rstorch, "" },
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{ rstorch, quartz, rstorch },
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{ stone, stone, stone },
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}
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})
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-- Register active block handlers
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minetest.register_abm({
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label = "Comparator signal input check (comparator is off)",
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nodenames = {
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"mcl_comparators:comparator_off_comp",
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"mcl_comparators:comparator_off_sub",
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},
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neighbors = {"group:container", "group:comparator_signal"},
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interval = 1,
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chance = 1,
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action = update_self,
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})
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minetest.register_abm({
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label = "Comparator signal input check (comparator is on)",
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nodenames = {
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"mcl_comparators:comparator_on_comp",
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"mcl_comparators:comparator_on_sub",
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},
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-- needs to run regardless of neighbors to make sure we detect when a
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-- container is dug
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interval = 1,
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chance = 1,
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action = update_self,
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})
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-- Add entry aliases for the Help
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if minetest.get_modpath("doc") then
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doc.add_entry_alias("nodes", "mcl_comparators:comparator_off_comp",
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"nodes", "mcl_comparators:comparator_off_sub")
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doc.add_entry_alias("nodes", "mcl_comparators:comparator_off_comp",
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"nodes", "mcl_comparators:comparator_on_comp")
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doc.add_entry_alias("nodes", "mcl_comparators:comparator_off_comp",
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"nodes", "mcl_comparators:comparator_on_sub")
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end
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