mirror of
https://github.com/minetest/minetest_game.git
synced 2024-12-23 07:10:19 +01:00
94 lines
2.9 KiB
Lua
94 lines
2.9 KiB
Lua
-- minetest/default/leafdecay.lua
|
|
|
|
-- To enable leaf decay for a node, add it to the "leafdecay" group.
|
|
--
|
|
-- The rating of the group determines how far from a node in the group "tree"
|
|
-- the node can be without decaying.
|
|
--
|
|
-- If param2 of the node is ~= 0, the node will always be preserved. Thus, if
|
|
-- the player places a node of that kind, you will want to set param2=1 or so.
|
|
|
|
default.leafdecay_trunk_cache = {}
|
|
default.leafdecay_enable_cache = true
|
|
-- Spread the load of finding trunks
|
|
default.leafdecay_trunk_find_allow_accumulator = 0
|
|
|
|
minetest.register_globalstep(function(dtime)
|
|
local finds_per_second = 5000
|
|
default.leafdecay_trunk_find_allow_accumulator =
|
|
math.floor(dtime * finds_per_second)
|
|
end)
|
|
|
|
minetest.register_abm({
|
|
nodenames = {"group:leafdecay"},
|
|
neighbors = {"air", "group:liquid"},
|
|
-- A low interval and a high inverse chance spreads the load
|
|
interval = 2,
|
|
chance = 5,
|
|
|
|
action = function(p0, node, _, _)
|
|
--print("leafdecay ABM at "..p0.x..", "..p0.y..", "..p0.z..")")
|
|
local do_preserve = false
|
|
local d = minetest.registered_nodes[node.name].groups.leafdecay
|
|
if not d or d == 0 then
|
|
--print("not groups.leafdecay")
|
|
return
|
|
end
|
|
local n0 = minetest.env:get_node(p0)
|
|
if n0.param2 ~= 0 then
|
|
--print("param2 ~= 0")
|
|
return
|
|
end
|
|
local p0_hash = nil
|
|
if default.leafdecay_enable_cache then
|
|
p0_hash = minetest.hash_node_position(p0)
|
|
local trunkp = default.leafdecay_trunk_cache[p0_hash]
|
|
if trunkp then
|
|
local n = minetest.env:get_node(trunkp)
|
|
local reg = minetest.registered_nodes[n.name]
|
|
-- Assume ignore is a trunk, to make the thing work at the border of the active area
|
|
if n.name == "ignore" or (reg and reg.groups.tree and reg.groups.tree ~= 0) then
|
|
--print("cached trunk still exists")
|
|
return
|
|
end
|
|
--print("cached trunk is invalid")
|
|
-- Cache is invalid
|
|
table.remove(default.leafdecay_trunk_cache, p0_hash)
|
|
end
|
|
end
|
|
if default.leafdecay_trunk_find_allow_accumulator <= 0 then
|
|
return
|
|
end
|
|
default.leafdecay_trunk_find_allow_accumulator =
|
|
default.leafdecay_trunk_find_allow_accumulator - 1
|
|
-- Assume ignore is a trunk, to make the thing work at the border of the active area
|
|
local p1 = minetest.env:find_node_near(p0, d, {"ignore", "group:tree"})
|
|
if p1 then
|
|
do_preserve = true
|
|
if default.leafdecay_enable_cache then
|
|
--print("caching trunk")
|
|
-- Cache the trunk
|
|
default.leafdecay_trunk_cache[p0_hash] = p1
|
|
end
|
|
end
|
|
if not do_preserve then
|
|
-- Drop stuff other than the node itself
|
|
itemstacks = minetest.get_node_drops(n0.name)
|
|
for _, itemname in ipairs(itemstacks) do
|
|
if itemname ~= n0.name then
|
|
local p_drop = {
|
|
x = p0.x - 0.5 + math.random(),
|
|
y = p0.y - 0.5 + math.random(),
|
|
z = p0.z - 0.5 + math.random(),
|
|
}
|
|
minetest.env:add_item(p_drop, itemname)
|
|
end
|
|
end
|
|
-- Remove node
|
|
minetest.env:remove_node(p0)
|
|
nodeupdate(p0)
|
|
end
|
|
end
|
|
})
|
|
|