Improve performance of mesecon.turnon and mesecon.turnoff (#556)

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DS 2021-03-25 16:53:51 +01:00 committed by GitHub
parent 93aa24dc42
commit 3f75c06a3b
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2 changed files with 93 additions and 17 deletions

62
mesecons/fifo_queue.lua Normal file
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@ -0,0 +1,62 @@
-- a simple first-in-first-out queue
-- very similar to the one in https://github.com/minetest/minetest/pull/7683
local fifo_queue = {}
local metatable = {__index = fifo_queue}
-- creates a new empty queue
function fifo_queue.new()
local q = {n_in = 0, n_out = 0, i_out = 1, buf_in = {}, buf_out = {}}
setmetatable(q, metatable)
return q
end
-- adds an element to the queue
function fifo_queue.add(self, v)
local n = self.n_in + 1
self.n_in = n
self.buf_in[n] = v
end
-- removes and returns the next element, or nil of empty
function fifo_queue.take(self)
local i_out = self.i_out
if i_out <= self.n_out then
local v = self.buf_out[i_out]
self.i_out = i_out + 1
self.buf_out[i_out] = true
return v
end
-- buf_out is empty, try to swap
self.i_out = 1
self.n_out = 0
if self.n_in == 0 then
return nil -- empty
end
-- swap
self.n_out = self.n_in
self.n_in = 0
self.buf_out, self.buf_in = self.buf_in, self.buf_out
local v = self.buf_out[1]
self.i_out = 2
self.buf_out[1] = true
return v
end
-- returns whether the queue is empty
function fifo_queue.is_empty(self)
return self.n_out == self.i_out + 1 and self.n_in == 0
end
-- returns stuff for iteration in a for loop, like pairs
-- adding new elements while iterating is no problem
function fifo_queue.iter(self)
return fifo_queue.take, self, nil
end
return fifo_queue

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@ -11,7 +11,7 @@
-- RECEPTORS
-- mesecon.is_receptor(nodename) --> Returns true if nodename is a receptor
-- mesecon.is_receptor_on(nodename --> Returns true if nodename is an receptor with state = mesecon.state.on
-- mesecon.is_receptor_on(nodename) --> Returns true if nodename is an receptor with state = mesecon.state.on
-- mesecon.is_receptor_off(nodename) --> Returns true if nodename is an receptor with state = mesecon.state.off
-- mesecon.receptor_get_rules(node) --> Returns the rules of the receptor (mesecon.rules.default if none specified)
@ -46,6 +46,8 @@
-- mesecon.rotate_rules_down(rules)
-- These functions return rules that have been rotated in the specific direction
local fifo_queue = dofile(minetest.get_modpath("mesecons").."/fifo_queue.lua")
-- General
function mesecon.get_effector(nodename)
if minetest.registered_nodes[nodename]
@ -371,32 +373,39 @@ end
-- Follow all all conductor paths replacing conductors that were already
-- looked at, activating / changing all effectors along the way.
function mesecon.turnon(pos, link)
local frontiers = {{pos = pos, link = link}}
local frontiers = fifo_queue.new()
frontiers:add({pos = pos, link = link})
local pos_can_be_skipped = {}
local depth = 1
while frontiers[1] do
local f = table.remove(frontiers, 1)
for f in frontiers:iter() do
local node = mesecon.get_node_force(f.pos)
if not node then
-- Area does not exist; do nothing
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
elseif mesecon.is_conductor_off(node, f.link) then
local rules = mesecon.conductor_get_rules(node)
-- Call turnon on neighbors
for _, r in ipairs(mesecon.rule2meta(f.link, rules)) do
local np = vector.add(f.pos, r)
if not pos_can_be_skipped[minetest.hash_node_position(np)] then
for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
table.insert(frontiers, {pos = np, link = l})
frontiers:add({pos = np, link = l})
end
end
end
mesecon.swap_node_force(f.pos, mesecon.get_conductor_on(node, f.link))
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
elseif mesecon.is_effector(node.name) then
mesecon.changesignal(f.pos, node, f.link, mesecon.state.on, depth)
if mesecon.is_effector_off(node.name) then
mesecon.activate(f.pos, node, f.link, depth)
end
else
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
end
depth = depth + 1
end
@ -419,37 +428,40 @@ end
-- depth = indicates order in which signals wire fired, higher is later
-- }
function mesecon.turnoff(pos, link)
local frontiers = {{pos = pos, link = link}}
local frontiers = fifo_queue.new()
frontiers:add({pos = pos, link = link})
local signals = {}
local pos_can_be_skipped = {}
local depth = 1
while frontiers[1] do
local f = table.remove(frontiers, 1)
for f in frontiers:iter() do
local node = mesecon.get_node_force(f.pos)
if not node then
-- Area does not exist; do nothing
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
elseif mesecon.is_conductor_on(node, f.link) then
local rules = mesecon.conductor_get_rules(node)
for _, r in ipairs(mesecon.rule2meta(f.link, rules)) do
local np = vector.add(f.pos, r)
if not pos_can_be_skipped[minetest.hash_node_position(np)] then
-- Check if an onstate receptor is connected. If that is the case,
-- abort this turnoff process by returning false. `receptor_off` will
-- discard all the changes that we made in the voxelmanip:
for _, l in ipairs(mesecon.rules_link_rule_all_inverted(f.pos, r)) do
if mesecon.is_receptor_on(mesecon.get_node_force(np).name) then
return false
end
end
-- Call turnoff on neighbors
for _, l in ipairs(mesecon.rules_link_rule_all(f.pos, r)) do
table.insert(frontiers, {pos = np, link = l})
frontiers:add({pos = np, link = l})
end
end
end
mesecon.swap_node_force(f.pos, mesecon.get_conductor_off(node, f.link))
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
elseif mesecon.is_effector(node.name) then
table.insert(signals, {
pos = f.pos,
@ -457,6 +469,8 @@ function mesecon.turnoff(pos, link)
link = f.link,
depth = depth
})
else
pos_can_be_skipped[minetest.hash_node_position(f.pos)] = true
end
depth = depth + 1
end