fluid_lib/fluid_transfer/network.lua

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local node_io_present = minetest.get_modpath("node_io") ~= nil
-- Network graphs are built eminating from provider nodes.
-- TODO: Caching
---------------------
-- Graph Functions --
---------------------
local function flatten(map)
local list = {}
for key, value in pairs(map) do
list[#list + 1] = value
end
return list
end
local function get_node_property(meta, pos, prop)
local value = meta:get_int(prop)
if value == 0 or value == nil then
local nname = minetest.get_node(pos).name
local ndef = minetest.registered_nodes[nname]
value = ndef[prop]
end
if not value then return 0 end
return value
end
local function face_front(pos, fd)
local back = minetest.facedir_to_dir(fd)
local front = table.copy(back)
front.x = front.x * -1 + pos.x
front.y = front.y * -1 + pos.y
front.z = front.z * -1 + pos.z
return front
end
local function clear_networks_from_node(pos)
local meta = minetest.get_meta(pos)
meta:set_string("network_id", "")
end
local function add_node(nodes, pos, pnodeid)
local node_id = minetest.hash_node_position(pos)
if nodes[node_id] then
return false
end
nodes[node_id] = pos
return true
end
local function add_duct_node(nodes, pos, pnodeid, queue)
if add_node(nodes, pos, pnodeid) then
queue[#queue + 1] = pos
end
end
local function check_node(targets, all_nodes, pos, p_pos, pnodeid, queue)
local node = minetest.get_node(pos)
local meta = minetest.get_meta(pos)
local ndef = minetest.registered_nodes[node.name]
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if not ndef then return end
if minetest.get_item_group(node.name, "fluid_transport") > 0 then
add_duct_node(all_nodes, pos, pnodeid, queue)
return
end
if not ndef['node_io_can_put_liquid'] or not ndef['node_io_can_put_liquid'](pos, node, "") then
return
end
add_node(targets, pos, pnodeid)
end
local function traverse_network(targets, all_nodes, pos, p_pos, pnodeid, queue)
local positions = {
{x=pos.x+1, y=pos.y, z=pos.z},
{x=pos.x-1, y=pos.y, z=pos.z},
{x=pos.x, y=pos.y+1, z=pos.z},
{x=pos.x, y=pos.y-1, z=pos.z},
{x=pos.x, y=pos.y, z=pos.z+1},
{x=pos.x, y=pos.y, z=pos.z-1}}
for _, cur_pos in pairs(positions) do
check_node(targets, all_nodes, cur_pos, p_pos, pnodeid, queue)
end
end
local function fluid_targets(p_pos, pos)
local provider = minetest.get_node(p_pos)
local pnodeid = minetest.pos_to_string(p_pos)
local targets = {}
local queue = {}
local all_nodes = {}
local node = minetest.get_node(pos)
local ndef = minetest.registered_nodes[node.name]
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if ndef and minetest.get_item_group(node.name, "fluid_transport") > 0 then
add_duct_node(all_nodes, pos, pnodeid, queue)
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elseif ndef and ndef['node_io_can_put_liquid'] and ndef['node_io_can_put_liquid'](pos, node, "") then
queue = {p_pos}
end
while next(queue) do
local to_visit = {}
for _, posi in ipairs(queue) do
traverse_network(targets, all_nodes, posi, p_pos, pnodeid, to_visit)
end
queue = to_visit
end
targets = flatten(targets)
all_nodes = flatten(all_nodes)
return targets
end
function fluid_lib.transfer_timer_tick(pos, elapsed)
local refresh = true
local node = minetest.get_node_or_nil(pos)
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local status = "Fluid Pump"
if not node then
return false
end
local meta = minetest.get_meta(pos)
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local targets = {}
-- Only allow the node directly behind to be a start of a network
local tpos = vector.add(minetest.facedir_to_dir(node.param2), pos)
local tnode = minetest.get_node(tpos)
local ndef = minetest.registered_nodes[tnode.name]
if minetest.get_item_group(tnode.name, "fluid_transport") == 0 and
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(not ndef or not ndef['node_io_can_put_liquid'] or not ndef['node_io_can_put_liquid'](tpos, tnode, "")) then
minetest.forceload_free_block(pos)
return
end
-- Retrieve network
targets = fluid_targets(pos, tpos)
-- No targets, don't proceed
if #targets == 0 then
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meta:set_string("infotext", status.."\nNo Recieving Tank")
return true
end
-- Begin transfer
local srcpos = face_front(pos, node.param2)
local srcnode = minetest.get_node(srcpos)
-- Make sure source node is not air
if not srcnode or srcnode.name == "air" then
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meta:set_string("infotext", status.."\nNo Source Tank")
return true
end
local srcdef = minetest.registered_nodes[srcnode.name]
-- Make sure source node is a registered fluid container
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if not srcdef or not srcdef['node_io_can_take_liquid'] then
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meta:set_string("infotext", status.." Off")
return false
end
local c = srcdef.node_io_can_take_liquid(srcpos, srcnode, "")
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if not c then
meta:set_string("infotext", status.." Off")
return false
end
local srcmeta = minetest.get_meta(srcpos)
local fl_size = srcdef.node_io_get_liquid_size(srcpos, srcnode, "")
local buffers = {}
for i = 1, fl_size do
buffers[i] = srcdef.node_io_get_liquid_name(srcpos, srcnode, "", i)
end
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if not #buffers then
meta:set_string("infotext", status.."\nNo Source Tank")
return true
end
-- Limit the amount of fluid pumped per cycle
local pcapability = get_node_property(meta, pos, "fluid_pump_capacity")
local pumped = 0
-- Transfer some fluid here
for _,pos in pairs(targets) do
if not vector.equals(pos, srcpos) then
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if pumped >= pcapability then break end
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local destnode = minetest.get_node(pos)
local destdef = minetest.registered_nodes[destnode.name]
local pp = nil
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if destdef and destdef['node_io_can_put_liquid'] then
if destdef.node_io_can_put_liquid(pos, destnode, "") then
pp = {}
local fl_size = destdef.node_io_get_liquid_size(pos, destnode, "")
for i = 1, fl_size do
pp[i] = destdef.node_io_get_liquid_name(pos, destnode, "", i)
end
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if #pp == 0 then pp = nil end
end
end
local changed = false
if pp ~= nil then
for bindex,bfluid in pairs(pp) do -- bfluid = destination fluid name
for aindex,afluid in pairs(buffers) do -- afluid = source fluid name
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-- get fluid names for pump status
local bfluid_des = ""
local afluid_des = ""
if bfluid ~= "" then
bfluid_des = minetest.registered_nodes[bfluid].description
end
if afluid ~= "" then
afluid_des = minetest.registered_nodes[afluid].description
end
if pumped >= pcapability then
meta:set_string("infotext", status.."\nPumped Max Volume".." "..bfluid_des)
break
end
if (afluid == bfluid or bfluid == "") then -- bfluid = "", empty destiniation
local idef = destdef.node_io_room_for_liquid(pos, destnode, "", afluid, pcapability)
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if idef > 0 then
local fluidcount = srcdef.node_io_get_liquid_stack(srcpos, srcnode, "", aindex):get_count()
local defc = math.min(fluidcount, idef)
local defi = srcdef.node_io_take_liquid(srcpos, srcnode, "", nil, afluid, defc)
if defi and defi.millibuckets > 0 then
local lo = destdef.node_io_put_liquid(pos, destnode, "", nil, afluid, defi.millibuckets)
pumped = pumped + (defi.millibuckets - lo)
meta:set_string("infotext", status.."\nPumping "..afluid_des)
changed = true
end
else
meta:set_string("infotext", status.."\nStandby")
end
end
end
end
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else
meta:set_string("infotext", status.."\nStandby")
end
if changed then
minetest.get_node_timer(srcpos):start(1.0)
minetest.get_node_timer(pos):start(1.0)
end
end
end
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return refresh
end
function fluid_lib.refresh_node(pos)
local t = minetest.get_node_timer(pos)
if t and not t:is_started() then
t:start(1.0)
end
if node_io_present then
node_io.update_neighbors(pos)
end
end
minetest.register_lbm({
label = "Fluid Transfer Tick",
name = "fluid_transfer:fluid_transfer_tick",
nodenames = {"group:fluid_transport_source", "group:fluid_pump"},
run_at_every_load = true,
action = fluid_lib.refresh_node,
})