99 lines
2.9 KiB
Lua
99 lines
2.9 KiB
Lua
-- Overrides the builtin minetest.check_single_for_falling.
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-- We need to do this in order to handle nodes in mineclone specific groups
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-- "supported_node" and "attached_node_facedir".
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--
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-- Nodes in group "supported_node" can be placed on any node that does not
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-- have the "airlike" drawtype. Carpets are an example of this type.
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local pairs = pairs
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local math = math
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local vector = vector
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local facedir_to_dir = minetest.facedir_to_dir
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local get_item_group = minetest.get_item_group
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local remove_node = minetest.remove_node
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local get_node = minetest.get_node
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local get_meta = minetest.get_meta
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local registered_nodes = minetest.registered_nodes
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local get_node_drops = minetest.get_node_drops
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local add_item = minetest.add_item
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-- drop_attached_node(p)
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--
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-- This function is copied verbatim from minetest/builtin/game/falling.lua
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-- We need this to do the exact same dropping node handling in our override
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-- minetest.check_single_for_falling() function as in the builtin function.
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--
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---@param p Vector
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local function drop_attached_node(p)
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local n = get_node(p)
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local drops = get_node_drops(n, "")
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local def = registered_nodes[n.name]
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if def and def.preserve_metadata then
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local oldmeta = get_meta(p):to_table().fields
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-- Copy pos and node because the callback can modify them.
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local pos_copy = vector.copy(p)
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local node_copy = { name = n.name, param1 = n.param1, param2 = n.param2 }
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local drop_stacks = {}
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for k, v in pairs(drops) do
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drop_stacks[k] = ItemStack(v)
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end
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drops = drop_stacks
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def.preserve_metadata(pos_copy, node_copy, oldmeta, drops)
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end
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if def and def.sounds and def.sounds.fall then
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minetest.sound_play(def.sounds.fall, { pos = p }, true)
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end
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remove_node(p)
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for _, item in pairs(drops) do
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local pos = vector.offset(p,
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math.random() / 2 - 0.25,
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math.random() / 2 - 0.25,
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math.random() / 2 - 0.25
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)
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add_item(pos, item)
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end
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end
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-- minetest.check_single_for_falling(pos)
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--
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-- * causes an unsupported `group:falling_node` node to fall and causes an
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-- unattached `group:attached_node` or `group:attached_node_facedir` node
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-- or unsupported `group:supported_node` node to drop.
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-- * does not spread these updates to neighbours.
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--
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-- Returns true if the node at <pos> has spawned a falling node or has been
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-- dropped as item(s).
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--
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local original_function = minetest.check_single_for_falling
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function minetest.check_single_for_falling(pos)
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if original_function(pos) then
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return true
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end
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local node = get_node(pos)
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if get_item_group(node.name, "attached_node_facedir") ~= 0 then
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local dir = facedir_to_dir(node.param2)
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if dir then
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if get_item_group(get_node(vector.add(pos, dir)).name, "solid") == 0 then
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drop_attached_node(pos)
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return true
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end
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end
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end
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if get_item_group(node.name, "supported_node") ~= 0 then
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local def = registered_nodes[get_node(vector.offset(pos, 0, -1, 0)).name]
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if def and def.drawtype == "airlike" then
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drop_attached_node(pos)
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return true
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end
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end
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return false
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end
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