summaryrefslogtreecommitdiff
path: root/new_flow_logic.lua
diff options
context:
space:
mode:
Diffstat (limited to 'new_flow_logic.lua')
-rw-r--r--new_flow_logic.lua121
1 files changed, 121 insertions, 0 deletions
diff --git a/new_flow_logic.lua b/new_flow_logic.lua
new file mode 100644
index 0000000..3fd1bb6
--- /dev/null
+++ b/new_flow_logic.lua
@@ -0,0 +1,121 @@
+-- reimplementation of new_flow_logic branch: processing functions
+-- written 2017 by thetaepsilon
+
+
+
+-- 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
+
+
+
+-- local debuglog = function(msg) print("## "..msg) 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, intake_limit)
+ local newpressure = actual_intake + currentpressure
+ -- debuglog("oldpressure "..currentpressure.." intake_limit "..intake_limit.." actual_intake "..actual_intake.." newpressure "..newpressure)
+ meta:set_float(label_pressure, newpressure)
+end
+
+
+
+pipeworks.run_spigot_output = function(pos, node)
+ -- try to output a water source node if there's enough pressure and space below.
+ local meta = minetest.get_meta(pos)
+ local currentpressure = meta:get_float(label_pressure)
+ if currentpressure > 1 then
+ local below = {x=pos.x, y=pos.y-1, z=pos.z}
+ local name = minetest.get_node(below).name
+ if (name == "air") or (name == "default:water_flowing") then
+ minetest.set_node(below, {name="default:water_source"})
+ meta:set_float(label_pressure, currentpressure - 1)
+ end
+ end
+end