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local luaentity = pipeworks.luaentity
local enable_max_limit = minetest.settings:get_bool("pipeworks_enable_items_per_tube_limit")
local max_tube_limit = tonumber(minetest.settings:get("pipeworks_max_items_per_tube")) or 30
if enable_max_limit == nil then enable_max_limit = true end
function pipeworks.tube_item(pos, item)
error("obsolete pipeworks.tube_item() called; change caller to use pipeworks.tube_inject_item() instead")
end
function pipeworks.tube_inject_item(pos, start_pos, velocity, item, owner)
-- Take item in any format
local stack = ItemStack(item)
local obj = luaentity.add_entity(pos, "pipeworks:tubed_item")
obj:set_item(stack:to_string())
obj.start_pos = vector.new(start_pos)
obj:set_velocity(velocity)
obj.owner = owner
--obj:set_color("red") -- todo: this is test-only code
return obj
end
-- adding two tube functions
-- can_remove(pos,node,stack,dir) returns the maximum number of items of that stack that can be removed
-- remove_items(pos,node,stack,dir,count) removes count items and returns them
-- both optional w/ sensible defaults and fallback to normal allow_* function
-- XXX: possibly change insert_object to insert_item
local default_adjlist={{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=0,y=1,z=0},{x=0,y=-1,z=0},{x=1,y=0,z=0},{x=-1,y=0,z=0}}
function pipeworks.notvel(tbl, vel)
local tbl2={}
for _,val in ipairs(tbl) do
if val.x ~= -vel.x or val.y ~= -vel.y or val.z ~= -vel.z then table.insert(tbl2, val) end
end
return tbl2
end
local tube_item_count = {}
minetest.register_globalstep(function(dtime)
if not luaentity.entities then
return
end
tube_item_count = {}
for _, entity in pairs(luaentity.entities) do
if entity.name == "pipeworks:tubed_item" then
local h = minetest.hash_node_position(vector.round(entity._pos))
tube_item_count[h] = (tube_item_count[h] or 0) + 1
end
end
end)
-- tube overload mechanism:
-- when the tube's item count (tracked in the above tube_item_count table)
-- exceeds the limit configured per tube, replace it with a broken one.
function pipeworks.break_tube(pos)
local node = minetest.get_node(pos)
local meta = minetest.get_meta(pos)
meta:set_string("the_tube_was", minetest.serialize(node))
minetest.swap_node(pos, {name = "pipeworks:broken_tube_1"})
pipeworks.scan_for_tube_objects(pos)
end
local crunch_tube = function(pos, cnode, cmeta)
if enable_max_limit then
local h = minetest.hash_node_position(pos)
local itemcount = tube_item_count[h] or 0
if itemcount > max_tube_limit then
pipeworks.logger("Warning - a tube at "..minetest.pos_to_string(pos).." broke due to too many items ("..itemcount..")")
pipeworks.break_tube(pos)
end
end
end
-- compatibility behaviour for the existing can_go() callbacks,
-- which can only specify a list of possible positions.
local function go_next_compat(pos, cnode, cmeta, cycledir, vel, stack, owner)
local next_positions = {}
local max_priority = 0
local can_go
if minetest.registered_nodes[cnode.name] and minetest.registered_nodes[cnode.name].tube and minetest.registered_nodes[cnode.name].tube.can_go then
can_go = minetest.registered_nodes[cnode.name].tube.can_go(pos, cnode, vel, stack)
else
local adjlist_string = minetest.get_meta(pos):get_string("adjlist")
local adjlist = minetest.deserialize(adjlist_string) or default_adjlist -- backward compat: if not found, use old behavior: all directions
can_go = pipeworks.notvel(adjlist, vel)
end
-- can_go() is expected to return an array-like table of candidate offsets.
-- for each one, look at the node at that offset and determine if it can accept the item.
-- also note the prioritisation:
-- if any tube is found with a greater priority than previously discovered,
-- then the valid positions are reset and and subsequent positions under this are skipped.
-- this has the effect of allowing only equal priorities to co-exist.
for _, vect in ipairs(can_go) do
local npos = vector.add(pos, vect)
pipeworks.load_position(npos)
local node = minetest.get_node(npos)
local reg_node = minetest.registered_nodes[node.name]
if reg_node then
local tube_def = reg_node.tube
local tubedevice = minetest.get_item_group(node.name, "tubedevice")
local tube_priority = (tube_def and tube_def.priority) or 100
if tubedevice > 0 and tube_priority >= max_priority then
if not tube_def or not tube_def.can_insert or
tube_def.can_insert(npos, node, stack, vect, owner) then
if tube_priority > max_priority then
max_priority = tube_priority
next_positions = {}
end
next_positions[#next_positions + 1] = {pos = npos, vect = vect}
end
end
end
end
-- indicate not found if no valid rules were picked up,
-- and don't change the counter.
if not next_positions[1] then
return cycledir, false, nil, nil
end
-- otherwise rotate to the next output direction and return that
local n = (cycledir % (#next_positions)) + 1
local new_velocity = vector.multiply(next_positions[n].vect, vel.speed)
return n, true, new_velocity, nil
end
-- function called by the on_step callback of the pipeworks tube luaentity.
-- the routine is passed the current node position, velocity, itemstack,
-- and owner name.
-- returns three values:
-- * a boolean "found destination" status;
-- * a new velocity vector that the tubed item should use, or nil if not found;
-- * a "multi-mode" data table (or nil if N/A) where a stack was split apart.
-- if this is not nil, the luaentity spawns new tubed items for each new fragment stack,
-- then deletes itself (i.e. the original item stack).
local function go_next(pos, velocity, stack, owner)
local cnode = minetest.get_node(pos)
local cmeta = minetest.get_meta(pos)
local speed = math.abs(velocity.x + velocity.y + velocity.z)
if speed == 0 then
speed = 1
end
local vel = {x = velocity.x/speed, y = velocity.y/speed, z = velocity.z/speed,speed=speed}
if speed >= 4.1 then
speed = 4
elseif speed >= 1.1 then
speed = speed - 0.1
else
speed = 1
end
vel.speed = speed
crunch_tube(pos, cnode, cmeta)
-- cycling of outputs:
-- an integer counter is kept in each pipe's metadata,
-- which allows tracking which output was previously chosen.
-- note reliance on get_int returning 0 for uninitialised.
local cycledir = cmeta:get_int("tubedir")
-- pulled out and factored out into go_next_compat() above.
-- n is the new value of the cycle counter.
-- XXX: this probably needs cleaning up after being split out,
-- seven args is a bit too many
local n, found, new_velocity, multimode = go_next_compat(pos, cnode, cmeta, cycledir, vel, stack, owner)
-- if not using output cycling,
-- don't update the field so it stays the same for the next item.
if pipeworks.enable_cyclic_mode then
cmeta:set_int("tubedir", n)
end
return found, new_velocity, multimode
end
minetest.register_entity("pipeworks:tubed_item", {
initial_properties = {
hp_max = 1,
physical = false,
collisionbox = {0.1, 0.1, 0.1, 0.1, 0.1, 0.1},
visual = "wielditem",
visual_size = {x = 0.15, y = 0.15},
textures = {""},
spritediv = {x = 1, y = 1},
initial_sprite_basepos = {x = 0, y = 0},
is_visible = false,
},
physical_state = false,
from_data = function(self, itemstring)
local stack = ItemStack(itemstring)
--[[
local itemtable = stack:to_table()
local itemname = nil
if itemtable then
itemname = stack:to_table().name
end
local item_texture = nil
local item_type = ""
if minetest.registered_items[itemname] then
item_texture = minetest.registered_items[itemname].inventory_image
item_type = minetest.registered_items[itemname].type
end
--]]
self.object:set_properties({
is_visible = true,
textures = {stack:get_name()}
})
local def = stack:get_definition()
self.object:set_yaw((def and def.type == "node") and 0 or math.pi * 0.25)
end,
get_staticdata = luaentity.get_staticdata,
on_activate = function(self, staticdata) -- Legacy code, should be replaced later by luaentity.on_activate
if staticdata == "" or staticdata == nil then
return
end
if staticdata == "toremove" then
self.object:remove()
return
end
local item = minetest.deserialize(staticdata)
pipeworks.tube_inject_item(self.object:get_pos(), item.start_pos, item.velocity, item.itemstring)
self.object:remove()
end,
})
minetest.register_entity("pipeworks:color_entity", {
initial_properties = {
hp_max = 1,
physical = false,
collisionbox = {0.1, 0.1, 0.1, 0.1, 0.1, 0.1},
visual = "cube",
visual_size = {x = 3.5, y = 3.5, z = 3.5}, -- todo: find correct size
textures = {""},
is_visible = false,
},
physical_state = false,
from_data = function(self, color)
local t = "pipeworks_color_"..color..".png"
local prop = {
is_visible = true,
visual = "cube",
textures = {t, t, t, t, t, t} -- todo: textures
}
self.object:set_properties(prop)
end,
get_staticdata = luaentity.get_staticdata,
on_activate = luaentity.on_activate,
})
-- see below for usage:
-- determine if go_next returned a multi-mode set.
local is_multimode = function(v)
return (type(v) == "table") and (v.__multimode)
end
luaentity.register_entity("pipeworks:tubed_item", {
itemstring = '',
item_entity = nil,
color_entity = nil,
color = nil,
start_pos = nil,
set_item = function(self, item)
local itemstring = ItemStack(item):to_string() -- Accept any input format
if self.itemstring == itemstring then
return
end
if self.item_entity then
self:remove_attached_entity(self.item_entity)
end
self.itemstring = itemstring
self.item_entity = self:add_attached_entity("pipeworks:tubed_item", itemstring)
end,
set_color = function(self, color)
if self.color == color then
return
end
self.color = color
if self.color_entity then
self:remove_attached_entity(self.color_entity)
end
if color then
self.color_entity = self:add_attached_entity("pipeworks:color_entity", color)
else
self.color_entity = nil
end
end,
on_step = function(self, dtime)
local pos = self:get_pos()
if self.start_pos == nil then
self.start_pos = vector.round(pos)
self:set_pos(pos)
end
local velocity = self:get_velocity()
local moved = false
local speed = math.abs(velocity.x + velocity.y + velocity.z)
if speed == 0 then
speed = 1
moved = true
end
local vel = {x = velocity.x / speed, y = velocity.y / speed, z = velocity.z / speed, speed = speed}
local moved_by = vector.distance(pos, self.start_pos)
if moved_by >= 1 then
self.start_pos = vector.add(self.start_pos, vel)
moved = true
end
if not moved then
return
end
local stack = ItemStack(self.itemstring)
pipeworks.load_position(self.start_pos)
local node = minetest.get_node(self.start_pos)
if minetest.get_item_group(node.name, "tubedevice_receiver") == 1 then
local leftover
if minetest.registered_nodes[node.name].tube and minetest.registered_nodes[node.name].tube.insert_object then
leftover = minetest.registered_nodes[node.name].tube.insert_object(self.start_pos, node, stack, vel, self.owner)
else
leftover = stack
end
if leftover:is_empty() then
self:remove()
return
end
velocity = vector.multiply(velocity, -1)
self:set_pos(vector.subtract(self.start_pos, vector.multiply(vel, moved_by - 1)))
self:set_velocity(velocity)
self:set_item(leftover:to_string())
return
end
local found_next, new_velocity, multimode = go_next(self.start_pos, velocity, stack, self.owner) -- todo: color
local rev_vel = vector.multiply(velocity, -1)
local rev_dir = vector.direction(self.start_pos,vector.add(self.start_pos,rev_vel))
local rev_node = minetest.get_node(vector.round(vector.add(self.start_pos,rev_dir)))
local tube_present = minetest.get_item_group(rev_node.name,"tubedevice") == 1
if not found_next then
if pipeworks.drop_on_routing_fail or not tube_present or
minetest.get_item_group(rev_node.name,"tube") ~= 1 then
-- Using add_item instead of item_drop since this makes pipeworks backward
-- compatible with Minetest 0.4.13.
-- Using item_drop here makes Minetest 0.4.13 crash.
local dropped_item = minetest.add_item(self.start_pos, stack)
if dropped_item then
dropped_item:set_velocity(vector.multiply(velocity, 5))
self:remove()
end
return
else
velocity = vector.multiply(velocity, -1)
self:set_pos(vector.subtract(self.start_pos, vector.multiply(vel, moved_by - 1)))
self:set_velocity(velocity)
end
elseif is_multimode(multimode) then
-- create new stacks according to returned data.
local s = self.start_pos
for _, split in ipairs(multimode) do
pipeworks.tube_inject_item(s, s, split.velocity, split.itemstack, self.owner)
end
-- remove ourself now the splits are sent
self:remove()
return
end
if new_velocity and not vector.equals(velocity, new_velocity) then
local nvelr = math.abs(new_velocity.x + new_velocity.y + new_velocity.z)
self:set_pos(vector.add(self.start_pos, vector.multiply(new_velocity, (moved_by - 1) / nvelr)))
self:set_velocity(new_velocity)
end
end
})
if minetest.get_modpath("mesecons_mvps") then
mesecon.register_mvps_unmov("pipeworks:tubed_item")
mesecon.register_mvps_unmov("pipeworks:color_entity")
mesecon.register_on_mvps_move(function(moved_nodes)
local moved = {}
for _, n in ipairs(moved_nodes) do
moved[minetest.hash_node_position(n.oldpos)] = vector.subtract(n.pos, n.oldpos)
end
for _, entity in pairs(luaentity.entities) do
if entity.name == "pipeworks:tubed_item" then
local pos = entity:get_pos()
local rpos = vector.round(pos)
local dir = moved[minetest.hash_node_position(rpos)]
if dir then
entity:set_pos(vector.add(pos, dir))
entity.start_pos = vector.add(entity.start_pos, dir)
end
end
end
end)
end