410 lines
11 KiB
Lua
410 lines
11 KiB
Lua
function mesecon.move_node(pos, newpos)
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local node = minetest.get_node(pos)
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local meta = minetest.get_meta(pos):to_table()
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minetest.remove_node(pos)
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minetest.set_node(newpos, node)
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minetest.get_meta(pos):from_table(meta)
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end
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function mesecon.flattenrules(allrules)
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--[[
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{
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{
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{xyz},
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{xyz},
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},
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{
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{xyz},
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{xyz},
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},
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}
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--]]
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if allrules[1] and
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allrules[1].x then
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return allrules
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end
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local shallowrules = {}
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for _, metarule in ipairs( allrules) do
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for _, rule in ipairs(metarule ) do
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table.insert(shallowrules, rule)
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end
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end
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return shallowrules
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--[[
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{
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{xyz},
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{xyz},
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{xyz},
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{xyz},
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}
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--]]
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end
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function mesecon.rule2bit(findrule, allrules)
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--get the bit of the metarule the rule is in, or bit 1
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if (allrules[1] and
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allrules[1].x) or
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not findrule then
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return 1
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end
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for m,metarule in ipairs( allrules) do
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for _, rule in ipairs(metarule ) do
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if vector.equals(findrule, rule) then
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return m
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end
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end
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end
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end
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function mesecon.rule2metaindex(findrule, allrules)
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--get the metarule the rule is in, or allrules
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if allrules[1].x then
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return nil
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end
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if not(findrule) then
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return mesecon.flattenrules(allrules)
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end
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for m, metarule in ipairs( allrules) do
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for _, rule in ipairs(metarule ) do
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if vector.equals(findrule, rule) then
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return m
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end
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end
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end
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end
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function mesecon.rule2meta(findrule, allrules)
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if #allrules == 0 then return {} end
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local index = mesecon.rule2metaindex(findrule, allrules)
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if index == nil then
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if allrules[1].x then
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return allrules
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else
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return {}
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end
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end
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return allrules[index]
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end
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-- Returns the 6 immediate neighbors of pos
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-- (nodes which touch the sides of pos).
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-- NOT PART OF ORIGINAL MESECONS!
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function mesecon.mcl_get_neighbors(pos)
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local r = {
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{ x= 0, y= 0, z=-1 },
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{ x= 0, y= 0, z= 1 },
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{ x= 0, y=-1, z= 0 },
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{ x= 0, y= 1, z= 0 },
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{ x=-1, y= 0, z= 0 },
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{ x= 1, y= 0, z= 0 },
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}
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local e = {}
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for i=1, #r do
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table.insert(e, { pos = vector.add(pos, r[i]), link = r[i] })
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end
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return e
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end
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function mesecon.dec2bin(n)
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local x, y = math.floor(n / 2), n % 2
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if (n > 1) then
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return mesecon.dec2bin(x)..y
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else
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return ""..y
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end
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end
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function mesecon.getstate(nodename, states)
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for state, name in ipairs(states) do
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if name == nodename then
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return state
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end
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end
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error(nodename.." doesn't mention itself in "..dump(states))
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end
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function mesecon.getbinstate(nodename, states)
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return mesecon.dec2bin(mesecon.getstate(nodename, states)-1)
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end
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function mesecon.get_bit(binary,bit)
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bit = bit or 1
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local c = binary:len()-(bit-1)
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return binary:sub(c,c) == "1"
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end
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function mesecon.set_bit(binary,bit,value)
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if value == "1" then
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if not mesecon.get_bit(binary,bit) then
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return mesecon.dec2bin(tonumber(binary,2)+math.pow(2,bit-1))
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end
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elseif value == "0" then
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if mesecon.get_bit(binary,bit) then
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return mesecon.dec2bin(tonumber(binary,2)-math.pow(2,bit-1))
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end
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end
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return binary
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end
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function mesecon.invertRule(r)
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return vector.multiply(r, -1)
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end
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function mesecon.tablecopy(table) -- deep table copy
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if type(table) ~= "table" then return table end -- no need to copy
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local newtable = {}
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for idx, item in pairs(table) do
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if type(item) == "table" then
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newtable[idx] = mesecon.tablecopy(item)
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else
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newtable[idx] = item
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end
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end
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return newtable
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end
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function mesecon.cmpAny(t1, t2)
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if type(t1) ~= type(t2) then return false end
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if type(t1) ~= "table" and type(t2) ~= "table" then return t1 == t2 end
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for i, e in pairs(t1) do
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if not mesecon.cmpAny(e, t2[i]) then return false end
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end
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return true
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end
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-- does not overwrite values; number keys (ipairs) are appended, not overwritten
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function mesecon.mergetable(source, dest)
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local rval = mesecon.tablecopy(dest)
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for k, v in pairs(source) do
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rval[k] = dest[k] or mesecon.tablecopy(v)
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end
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for i, v in ipairs(source) do
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table.insert(rval, mesecon.tablecopy(v))
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end
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return rval
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end
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function mesecon.register_node(name, spec_common, spec_off, spec_on)
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spec_common.drop = spec_common.drop or name .. "_off"
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spec_common.__mesecon_basename = name
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spec_on.__mesecon_state = "on"
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spec_off.__mesecon_state = "off"
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spec_on = mesecon.mergetable(spec_common, spec_on);
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spec_off = mesecon.mergetable(spec_common, spec_off);
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minetest.register_node(name .. "_on", spec_on)
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minetest.register_node(name .. "_off", spec_off)
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end
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-- swap onstate and offstate nodes, returns new state
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function mesecon.flipstate(pos, node)
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local nodedef = minetest.registered_nodes[node.name]
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local newstate
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if (nodedef.__mesecon_state == "on") then newstate = "off" end
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if (nodedef.__mesecon_state == "off") then newstate = "on" end
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minetest.swap_node(pos, {name = nodedef.__mesecon_basename .. "_" .. newstate,
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param2 = node.param2})
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return newstate
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end
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-- File writing / reading utilities
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local wpath = minetest.get_worldpath()
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function mesecon.file2table(filename)
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local f = io.open(wpath..DIR_DELIM..filename, "r")
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if f == nil then return {} end
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local t = f:read("*all")
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f:close()
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if t == "" or t == nil then return {} end
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return minetest.deserialize(t)
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end
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function mesecon.table2file(filename, table)
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local f = io.open(wpath..DIR_DELIM..filename, "w")
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f:write(minetest.serialize(table))
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f:close()
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end
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-- Block position "hashing" (convert to integer) functions for voxelmanip cache
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local BLOCKSIZE = 16
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-- convert node position --> block hash
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local function hash_blockpos(pos)
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return minetest.hash_node_position({
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x = math.floor(pos.x/BLOCKSIZE),
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y = math.floor(pos.y/BLOCKSIZE),
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z = math.floor(pos.z/BLOCKSIZE)
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})
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end
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-- Maps from a hashed mapblock position (as returned by hash_blockpos) to a
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-- table.
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--
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-- Contents of the table are:
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-- “vm” → the VoxelManipulator
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-- “va” → the VoxelArea
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-- “data” → the data array
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-- “param1” → the param1 array
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-- “param2” → the param2 array
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-- “dirty” → true if data has been modified
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--
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-- Nil if no VM-based transaction is in progress.
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local vm_cache = nil
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-- Starts a VoxelManipulator-based transaction.
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--
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-- During a VM transaction, calls to vm_get_node and vm_swap_node operate on a
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-- cached copy of the world loaded via VoxelManipulators. That cache can later
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-- be committed to the real map by means of vm_commit or discarded by means of
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-- vm_abort.
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function mesecon.vm_begin()
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vm_cache = {}
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end
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-- Finishes a VoxelManipulator-based transaction, freeing the VMs and map data
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-- and writing back any modified areas.
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function mesecon.vm_commit()
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for hash, tbl in pairs(vm_cache) do
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if tbl.dirty then
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local vm = tbl.vm
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vm:set_data(tbl.data)
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vm:write_to_map()
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vm:update_map()
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end
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end
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vm_cache = nil
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end
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-- Finishes a VoxelManipulator-based transaction, freeing the VMs and throwing
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-- away any modified areas.
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function mesecon.vm_abort()
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vm_cache = nil
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end
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-- Gets the cache entry covering a position, populating it if necessary.
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local function vm_get_or_create_entry(pos)
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local hash = hash_blockpos(pos)
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local tbl = vm_cache[hash]
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if not tbl then
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local vm = minetest.get_voxel_manip(pos, pos)
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local min_pos, max_pos = vm:get_emerged_area()
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local va = VoxelArea:new{MinEdge = min_pos, MaxEdge = max_pos}
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tbl = {vm = vm, va = va, data = vm:get_data(), param1 = vm:get_light_data(), param2 = vm:get_param2_data(), dirty = false}
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vm_cache[hash] = tbl
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end
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return tbl
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end
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-- Gets the node at a given position during a VoxelManipulator-based
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-- transaction.
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function mesecon.vm_get_node(pos)
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local tbl = vm_get_or_create_entry(pos)
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local index = tbl.va:indexp(pos)
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local node_value = tbl.data[index]
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if node_value == core.CONTENT_IGNORE then
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return nil
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else
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local node_param1 = tbl.param1[index]
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local node_param2 = tbl.param2[index]
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return {name = minetest.get_name_from_content_id(node_value), param1 = node_param1, param2 = node_param2}
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end
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end
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-- Sets a node’s name during a VoxelManipulator-based transaction.
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--
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-- Existing param1, param2, and metadata are left alone.
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function mesecon.vm_swap_node(pos, name)
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local tbl = vm_get_or_create_entry(pos)
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local index = tbl.va:indexp(pos)
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tbl.data[index] = minetest.get_content_id(name)
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tbl.dirty = true
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end
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-- Gets the node at a given position, regardless of whether it is loaded or
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-- not, respecting a transaction if one is in progress.
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--
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-- Outside a VM transaction, if the mapblock is not loaded, it is pulled into
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-- the server’s main map data cache and then accessed from there.
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--
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-- Inside a VM transaction, the transaction’s VM cache is used.
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function mesecon.get_node_force(pos)
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if vm_cache then
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return mesecon.vm_get_node(pos)
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else
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local node = minetest.get_node_or_nil(pos)
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if node == nil then
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-- Node is not currently loaded; use a VoxelManipulator to prime
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-- the mapblock cache and try again.
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minetest.get_voxel_manip(pos, pos)
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node = minetest.get_node_or_nil(pos)
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end
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return node
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end
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end
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-- Swaps the node at a given position, regardless of whether it is loaded or
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-- not, respecting a transaction if one is in progress.
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--
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-- Outside a VM transaction, if the mapblock is not loaded, it is pulled into
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-- the server’s main map data cache and then accessed from there.
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--
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-- Inside a VM transaction, the transaction’s VM cache is used.
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--
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-- This function can only be used to change the node’s name, not its parameters
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-- or metadata.
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function mesecon.swap_node_force(pos, name)
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if vm_cache then
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return mesecon.vm_swap_node(pos, name)
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else
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-- This serves to both ensure the mapblock is loaded and also hand us
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-- the old node table so we can preserve param2.
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local node = mesecon.get_node_force(pos)
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node.name = name
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minetest.swap_node(pos, node)
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end
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end
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-- Autoconnect Hooks
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-- Nodes like conductors may change their appearance and their connection rules
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-- right after being placed or after being dug, e.g. the default wires use this
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-- to automatically connect to linking nodes after placement.
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-- After placement, the update function will be executed immediately so that the
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-- possibly changed rules can be taken into account when recalculating the circuit.
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-- After digging, the update function will be queued and executed after
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-- recalculating the circuit. The update function must take care of updating the
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-- node at the given position itself, but also all of the other nodes the given
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-- position may have (had) a linking connection to.
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mesecon.autoconnect_hooks = {}
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-- name: A unique name for the hook, e.g. "foowire". Used to name the actionqueue function.
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-- fct: The update function with parameters function(pos, node)
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function mesecon.register_autoconnect_hook(name, fct)
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mesecon.autoconnect_hooks[name] = fct
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mesecon.queue:add_function("autoconnect_hook_"..name, fct)
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end
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function mesecon.execute_autoconnect_hooks_now(pos, node)
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for _, fct in pairs(mesecon.autoconnect_hooks) do
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fct(pos, node)
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end
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end
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function mesecon.execute_autoconnect_hooks_queue(pos, node)
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for name in pairs(mesecon.autoconnect_hooks) do
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mesecon.queue:add_action(pos, "autoconnect_hook_"..name, {node})
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end
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end
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