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-- This file provides the actual flow and pathfinding logic that makes water
-- move through the pipes.
--
-- Contributed by mauvebic, 2013-01-03, rewritten a bit by Vanessa Ezekowitz
--
local finitewater = minetest.settings:get_bool("liquid_finite")
pipeworks.check_for_liquids = function(pos)
local coords = {
{x=pos.x,y=pos.y-1,z=pos.z},
{x=pos.x,y=pos.y+1,z=pos.z},
{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,z=pos.z-1},
{x=pos.x,y=pos.y,z=pos.z+1}, }
for i =1,6 do
local name = minetest.get_node(coords[i]).name
if name and string.find(name,"water") then
if finitewater then minetest.remove_node(coords[i]) end
return true
end
end
return false
end
pipeworks.check_for_inflows = function(pos,node)
local coords = {
{x=pos.x,y=pos.y-1,z=pos.z},
{x=pos.x,y=pos.y+1,z=pos.z},
{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,z=pos.z-1},
{x=pos.x,y=pos.y,z=pos.z+1},
}
local newnode = false
local source = false
for i = 1, 6 do
if newnode then break end
local testnode = minetest.get_node(coords[i])
local name = testnode.name
if name and (name == "pipeworks:pump_on" and pipeworks.check_for_liquids(coords[i])) or string.find(name,"_loaded") then
if string.find(name,"_loaded") then
source = minetest.get_meta(coords[i]):get_string("source")
if source == minetest.pos_to_string(pos) then break end
end
if string.find(name, "valve") or string.find(name, "sensor") then
if ((i == 3 or i == 4) and minetest.facedir_to_dir(testnode.param2).x ~= 0)
or ((i == 5 or i == 6) and minetest.facedir_to_dir(testnode.param2).z ~= 0)
or ((i == 1 or i == 2) and minetest.facedir_to_dir(testnode.param2).y ~= 0) then
newnode = string.gsub(node.name,"empty","loaded")
source = {x=coords[i].x,y=coords[i].y,z=coords[i].z}
end
else
newnode = string.gsub(node.name,"empty","loaded")
source = {x=coords[i].x,y=coords[i].y,z=coords[i].z}
end
end
end
if newnode then
minetest.add_node(pos,{name=newnode, param2 = node.param2})
minetest.get_meta(pos):set_string("source",minetest.pos_to_string(source))
end
end
pipeworks.check_sources = function(pos,node)
local sourcepos = minetest.string_to_pos(minetest.get_meta(pos):get_string("source"))
if not sourcepos then return end
local source = minetest.get_node(sourcepos).name
local newnode = false
if source and not ((source == "pipeworks:pump_on" and pipeworks.check_for_liquids(sourcepos)) or string.find(source,"_loaded") or source == "ignore" ) then
newnode = string.gsub(node.name,"loaded","empty")
end
if newnode then
minetest.add_node(pos,{name=newnode, param2 = node.param2})
minetest.get_meta(pos):set_string("source","")
end
end
pipeworks.spigot_check = function(pos, node)
local belowname = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z}).name
if belowname and (belowname == "air" or belowname == "default:water_flowing" or belowname == "default:water_source") then
local spigotname = minetest.get_node(pos).name
local fdir=node.param2 % 4
local check = {
{x=pos.x,y=pos.y,z=pos.z+1},
{x=pos.x+1,y=pos.y,z=pos.z},
{x=pos.x,y=pos.y,z=pos.z-1},
{x=pos.x-1,y=pos.y,z=pos.z}
}
local near_node = minetest.get_node(check[fdir+1])
if near_node and string.find(near_node.name, "_loaded") then
if spigotname and spigotname == "pipeworks:spigot" then
minetest.add_node(pos,{name = "pipeworks:spigot_pouring", param2 = fdir})
if finitewater or belowname ~= "default:water_source" then
minetest.add_node({x=pos.x,y=pos.y-1,z=pos.z},{name = "default:water_source"})
end
end
else
if spigotname == "pipeworks:spigot_pouring" then
minetest.add_node({x=pos.x,y=pos.y,z=pos.z},{name = "pipeworks:spigot", param2 = fdir})
if belowname == "default:water_source" and not finitewater then
minetest.remove_node({x=pos.x,y=pos.y-1,z=pos.z})
end
end
end
end
end
pipeworks.fountainhead_check = function(pos, node)
local abovename = minetest.get_node({x=pos.x,y=pos.y+1,z=pos.z}).name
if abovename and (abovename == "air" or abovename == "default:water_flowing" or abovename == "default:water_source") then
local fountainhead_name = minetest.get_node(pos).name
local near_node = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z})
if near_node and string.find(near_node.name, "_loaded") then
if fountainhead_name and fountainhead_name == "pipeworks:fountainhead" then
minetest.add_node(pos,{name = "pipeworks:fountainhead_pouring"})
if finitewater or abovename ~= "default:water_source" then
minetest.add_node({x=pos.x,y=pos.y+1,z=pos.z},{name = "default:water_source"})
end
end
else
if fountainhead_name == "pipeworks:fountainhead_pouring" then
minetest.add_node({x=pos.x,y=pos.y,z=pos.z},{name = "pipeworks:fountainhead"})
if abovename == "default:water_source" and not finitewater then
minetest.remove_node({x=pos.x,y=pos.y+1,z=pos.z})
end
end
end
end
end
-- global values and thresholds for water behaviour
-- TODO: add some way of setting this per-world
local thresholds = {}
-- limit on pump pressure - will not absorb more than can be taken
thresholds.pump_pressure = 2
-- borrowed from above: might be useable to replace the above coords tables
local make_coords_offsets = function(pos, include_base)
local coords = {
{x=pos.x,y=pos.y-1,z=pos.z},
{x=pos.x,y=pos.y+1,z=pos.z},
{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,z=pos.z-1},
{x=pos.x,y=pos.y,z=pos.z+1},
}
if include_base then table.insert(coords, pos) end
return coords
end
-- new version of liquid check
-- accepts a limit parameter to only delete water blocks that the receptacle can accept,
-- and returns it so that the receptacle can update it's pressure values.
-- this should ensure that water blocks aren't vanished from existance.
-- will take care of zero or negative-valued limits.
pipeworks.check_for_liquids_v2 = function(pos, limit)
if not limit then
limit = 6
end
local coords = make_coords_offsets(pos, false)
local total = 0
for index, tpos in ipairs(coords) do
if total >= limit then break end
local name = minetest.get_node(tpos).name
if name == "default:water_source" then
minetest.remove_node(tpos)
total = total + 1
end
end
return total
end
local label_pressure = "pipeworks.water_pressure"
local label_haspressure = "pipeworks.is_pressure_node"
pipeworks.balance_pressure = function(pos, node)
-- debuglog("balance_pressure() "..node.name.." at "..pos.x.." "..pos.y.." "..pos.z)
-- check the pressure of all nearby nodes, and average it out.
-- for the moment, only balance neighbour nodes if it already has a pressure value.
-- XXX: maybe this could be used to add fluid behaviour to other mod's nodes too?
-- unconditionally include self in nodes to average over
local meta = minetest.get_meta(pos)
local currentpressure = meta:get_float(label_pressure)
meta:set_int(label_haspressure, 1)
local connections = { meta }
local totalv = currentpressure
local totalc = 1
-- then handle neighbours, but if not a pressure node don't consider them at all
for _, npos in ipairs(make_coords_offsets(pos, false)) do
local neighbour = minetest.get_meta(npos)
local haspressure = (neighbour:get_int(label_haspressure) ~= 0)
if haspressure then
local n = neighbour:get_float(label_pressure)
table.insert(connections, neighbour)
totalv = totalv + n
totalc = totalc + 1
end
end
local average = totalv / totalc
for _, targetmeta in ipairs(connections) do
targetmeta:set_float(label_pressure, average)
end
end
pipeworks.run_pump_intake = function(pos, node)
-- try to absorb nearby water nodes, but only up to limit.
-- NB: check_for_liquids_v2 handles zero or negative from the following subtraction
local meta = minetest.get_meta(pos)
local currentpressure = meta:get_float(label_pressure)
local intake_limit = thresholds.pump_pressure - currentpressure
local actual_intake = pipeworks.check_for_liquids_v2(pos, limit)
local newpressure = actual_intake + currentpressure
meta:set_float(label_pressure, newpressure)
end
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