forked from mtcontrib/pipeworks
121 lines
3.8 KiB
Lua
121 lines
3.8 KiB
Lua
-- reimplementation of new_flow_logic branch: processing functions
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-- written 2017 by thetaepsilon
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local flowlogic = {}
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pipeworks.flowlogic = flowlogic
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-- borrowed from above: might be useable to replace the above coords tables
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local make_coords_offsets = function(pos, include_base)
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local coords = {
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{x=pos.x,y=pos.y-1,z=pos.z},
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{x=pos.x,y=pos.y+1,z=pos.z},
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{x=pos.x-1,y=pos.y,z=pos.z},
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{x=pos.x+1,y=pos.y,z=pos.z},
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{x=pos.x,y=pos.y,z=pos.z-1},
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{x=pos.x,y=pos.y,z=pos.z+1},
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}
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if include_base then table.insert(coords, pos) end
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return coords
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end
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-- local debuglog = function(msg) print("## "..msg) end
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-- new version of liquid check
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-- accepts a limit parameter to only delete water blocks that the receptacle can accept,
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-- and returns it so that the receptacle can update it's pressure values.
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-- this should ensure that water blocks aren't vanished from existance.
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-- will take care of zero or negative-valued limits.
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local check_for_liquids_v2 = function(pos, limit)
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if not limit then
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limit = 6
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end
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local coords = make_coords_offsets(pos, false)
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local total = 0
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for index, tpos in ipairs(coords) do
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if total >= limit then break end
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local name = minetest.get_node(tpos).name
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if name == "default:water_source" then
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minetest.remove_node(tpos)
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total = total + 1
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end
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end
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return total
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end
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flowlogic.check_for_liquids_v2 = check_for_liquids_v2
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local label_pressure = "pipeworks.water_pressure"
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local label_haspressure = "pipeworks.is_pressure_node"
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flowlogic.balance_pressure = function(pos, node)
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-- debuglog("balance_pressure() "..node.name.." at "..pos.x.." "..pos.y.." "..pos.z)
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-- check the pressure of all nearby nodes, and average it out.
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-- for the moment, only balance neighbour nodes if it already has a pressure value.
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-- XXX: maybe this could be used to add fluid behaviour to other mod's nodes too?
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-- unconditionally include self in nodes to average over
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local meta = minetest.get_meta(pos)
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local currentpressure = meta:get_float(label_pressure)
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meta:set_int(label_haspressure, 1)
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local connections = { meta }
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local totalv = currentpressure
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local totalc = 1
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-- then handle neighbours, but if not a pressure node don't consider them at all
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for _, npos in ipairs(make_coords_offsets(pos, false)) do
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local neighbour = minetest.get_meta(npos)
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local haspressure = (neighbour:get_int(label_haspressure) ~= 0)
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if haspressure then
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local n = neighbour:get_float(label_pressure)
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table.insert(connections, neighbour)
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totalv = totalv + n
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totalc = totalc + 1
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end
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end
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local average = totalv / totalc
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for _, targetmeta in ipairs(connections) do
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targetmeta:set_float(label_pressure, average)
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end
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end
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flowlogic.run_pump_intake = function(pos, node, maxpressure)
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-- try to absorb nearby water nodes, but only up to limit.
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-- NB: check_for_liquids_v2 handles zero or negative from the following subtraction
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local meta = minetest.get_meta(pos)
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local currentpressure = meta:get_float(label_pressure)
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local intake_limit = maxpressure - currentpressure
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local actual_intake = check_for_liquids_v2(pos, intake_limit)
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local newpressure = actual_intake + currentpressure
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-- debuglog("oldpressure "..currentpressure.." intake_limit "..intake_limit.." actual_intake "..actual_intake.." newpressure "..newpressure)
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meta:set_float(label_pressure, newpressure)
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end
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flowlogic.run_spigot_output = function(pos, node)
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-- try to output a water source node if there's enough pressure and space below.
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local meta = minetest.get_meta(pos)
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local currentpressure = meta:get_float(label_pressure)
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if currentpressure > 1 then
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local below = {x=pos.x, y=pos.y-1, z=pos.z}
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local name = minetest.get_node(below).name
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if (name == "air") or (name == "default:water_flowing") then
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minetest.set_node(below, {name="default:water_source"})
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meta:set_float(label_pressure, currentpressure - 1)
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end
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end
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end
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