Change connection rules again to allow building parallel track, tees and crosses), start implementing rail rules callbacks
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c62011f4ae
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a132207fc5
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@ -15,40 +15,55 @@ local function table_merge(base, overlay)
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end
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local north = vector.new( 0, 0, 1); local N = 1
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local south = vector.new( 0, 0,-1); local S = 2 -- Note: this is overwritten below
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local south = vector.new( 0, 0,-1); local S = 2 -- Note: S is overwritten below with the translator
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local east = vector.new( 1, 0, 0); local E = 4
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local west = vector.new(-1, 0, 0); local W = 8
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local HORIZONTAL_CONNECTIONS = { north, south, east, west }
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local HORIZONTAL_STANDARD_MAPPINGS = {
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[N] = { "", 0 },
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[S] = { "", 0 },
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[N+S] = { "", 0 },
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local CONNECTIONS = { north, south, east, west }
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local HORIZONTAL_STANDARD_RULES = {
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[N] = { "", 0, mask = N, score = 1 },
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[S] = { "", 0, mask = S, score = 1 },
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[N+S] = { "", 0, mask = N+S, score = 2 },
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[E] = { "", 1 },
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[W] = { "", 1 },
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[E+W] = { "", 1 },
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[E] = { "", 1, mask = E, score = 1 },
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[W] = { "", 1, mask = W, score = 1 },
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[E+W] = { "", 1, mask = E+W, score = 2 },
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}
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local HORIZONTAL_CURVES_MAPPINGS = {
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[N+E] = { "_corner", 3 },
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[N+W] = { "_corner", 2 },
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[S+E] = { "_corner", 0 },
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[S+W] = { "_corner", 1 },
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[N+E+W] = { "_tee_off", 3 },
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[S+E+W] = { "_tee_off", 1 },
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[N+S+E] = { "_tee_off", 0 },
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[N+S+W] = { "_tee_off", 2 },
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local HORIZONTAL_CURVES_RULES = {
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[N+E] = { "_corner", 3, name = "ne corner", mask = N+E, score = 3 },
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[N+W] = { "_corner", 2, name = "nw corner", mask = N+W, score = 3 },
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[S+E] = { "_corner", 0, name = "se corner", mask = S+E, score = 3 },
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[S+W] = { "_corner", 1, name = "sw corner", mask = S+W, score = 3 },
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-- [N+S+E+W] = "_cross",
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[N+E+W] = { "_tee_off", 3, mask = N+E+W, score = 4 },
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[S+E+W] = { "_tee_off", 1, mask = S+E+W, score = 4 },
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[N+S+E] = { "_tee_off", 0, mask = N+S+E, score = 4 },
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[N+S+W] = { "_tee_off", 2, mask = N+S+W, score = 4 },
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[N+S+E+W] = { "_cross", 0, mask = N+S+E+W, score = 5 },
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}
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table_merge(HORIZONTAL_CURVES_MAPPINGS, HORIZONTAL_STANDARD_MAPPINGS)
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local HORIZONTAL_MAPPINGS_BY_RAIL_GROUP = {
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[1] = HORIZONTAL_STANDARD_MAPPINGS,
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[2] = HORIZONTAL_CURVES_MAPPINGS,
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table_merge(HORIZONTAL_CURVES_RULES, HORIZONTAL_STANDARD_RULES)
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local HORIZONTAL_RULES_BY_RAIL_GROUP = {
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[1] = HORIZONTAL_STANDARD_RULES,
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[2] = HORIZONTAL_CURVES_RULES,
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}
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print(dump(HORIZONTAL_MAPPINGS_BY_RAIL_GROUP))
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local DIRECTION_BITS = {N, S, E, W}
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local function check_connection_rule(pos, connections, rule)
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-- All bits in the mask must be set for the connection to be possible
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if bit.band(rule.mask,connections) ~= rule.mask then
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--print("Mask mismatch ("..tostring(rule.mask)..","..tostring(connections)..")")
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return false
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end
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-- If there is an allow filter, that mush also return true
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if rule.allow and rule.allow(rule, connections, pos) then
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return false
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end
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return true
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end
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local function update_rail_connections(pos, update_neighbors)
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local node = minetest.get_node(pos)
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@ -59,38 +74,105 @@ local function update_rail_connections(pos, update_neighbors)
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end
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-- Get the mappings to use
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local mappings = HORIZONTAL_MAPPINGS_BY_RAIL_GROUP[nodedef.groups.rail]
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if not mappings then return end
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local rules = HORIZONTAL_RULES_BY_RAIL_GROUP[nodedef.groups.rail]
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if nodedef._mcl_minecarts and nodedef._mcl_minecarts.connection_rules then -- Custom connection rules
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rules = nodedef._mcl_minecarts.connection_rules
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end
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if not rules then return end
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-- Horizontal rules, Check for rails on each neighbor
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local connections = 0
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for i = 1,4 do
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local neighbor = vector.add(pos, HORIZONTAL_CONNECTIONS[i])
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for i,dir in ipairs(CONNECTIONS) do
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local neighbor = vector.add(pos, dir)
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local node = minetest.get_node(neighbor)
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local nodedef = minetest.registered_nodes[node.name]
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if nodedef.groups.rail then
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connections = connections + DIRECTION_BITS[i]
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end
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if update_neighbors then
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update_rail_connections(neighbor, false)
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-- TODO: modify to only allow connections to the ends of rails (direction rules)
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if (nodedef.groups or {}).rail and nodedef._mcl_minecarts and nodedef._mcl_minecarts.get_next_dir then
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local diff = vector.direction(neighbor, pos)
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local next_dir = nodedef._mcl_minecarts.get_next_dir(neighbor, diff, node)
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if next_dir == diff then
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connections = connections + bit.lshift(1,i - 1)
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end
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end
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end
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local mapping = mappings[connections]
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if mapping then
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local new_name = nodedef._mcl_minecarts.base_name..mapping[1]
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if new_name ~= node.name or node.param2 ~= mapping[2] then
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print("swapping "..node.name.." for "..new_name..","..tostring(mapping[2]).." at "..tostring(pos))
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node.name = new_name
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node.param2 = mapping[2]
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minetest.swap_node(pos, node)
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-- Select the best allowed connection
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local rule = nil
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local score = 0
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for k,r in pairs(rules) do
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if check_connection_rule(pos, connections, r) then
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if r.score > score then
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--print("Best rule so far is "..dump(r))
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score = r.score
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rule = r
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end
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end
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end
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if not rule then return end
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-- Apply the mapping
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local new_name = nodedef._mcl_minecarts.base_name..rule[1]
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if new_name ~= node.name or node.param2 ~= rule[2] then
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print("swapping "..node.name.." for "..new_name..","..tostring(rule[2]).." at "..tostring(pos))
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node.name = new_name
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node.param2 = rule[2]
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minetest.swap_node(pos, node)
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end
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if rule.after then
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rule.after(rule, pos, connections)
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end
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end
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mod.update_rail_connections = update_rail_connections
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local function rail_dir_straight(pos, dir, node)
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if node.param2 == 0 or node.param2 == 2 then
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if vector.equals(dir, north) then
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return north
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else
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return south
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end
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else
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if vector.equals(dir,east) then
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return east
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else
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return west
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end
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end
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end
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local function rail_dir_curve(pos, dir, node)
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if node.param2 == 0 then
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-- South and East
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if vector.equals(dir, south) then return south end
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if vector.equals(dir, north) then return east end
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if vector.equals(dir, west) then return south end
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if vector.equals(dir, east) then return east end
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elseif node.param2 == 1 then
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-- South and West
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if vector.equals(dir, south) then return south end
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if vector.equals(dir, north) then return west end
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if vector.equals(dir, west) then return west end
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if vector.equals(dir, east) then return south end
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elseif node.param2 == 2 then
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-- North and West
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if vector.equals(dir, south) then return west end
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if vector.equals(dir, north) then return north end
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if vector.equals(dir, west) then return west end
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if vector.equals(dir, east) then return north end
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elseif node.param2 == 3 then
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-- North and East
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if vector.equals(dir, south) then return east end
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if vector.equals(dir, north) then return north end
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if vector.equals(dir, west) then return north end
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if vector.equals(dir, east) then return east end
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end
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end
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local function rail_dir_cross(pos, dir, node)
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-- Always continue in the same direction. No direction changes allowed
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return dir
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end
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-- Now get the translator after we have finished using S for other things
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local S = minetest.get_translator(modname)
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local BASE_DEF = {
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@ -119,12 +201,18 @@ local function register_curves_rail(base_name, tiles, def)
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-- Register the base node
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mod.register_rail(base_name, table_merge(table.copy(base_def),{
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tiles = { tiles[1] },
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_mcl_minecarts = {
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get_next_dir = rail_dir_straight
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}
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}))
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BASE_DEF.craft = nil
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-- Corner variants
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mod.register_rail(base_name.."_corner", table_merge(table.copy(base_def),{
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tiles = { tiles[2] },
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_mcl_minecarts = {
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get_next_dir = rail_dir_curve,
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},
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groups = {
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not_in_creative_inventory = 1,
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},
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@ -163,18 +251,19 @@ local function register_curves_rail(base_name, tiles, def)
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}))
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mod.register_rail_sloped(base_name.."_sloped", table_merge(table.copy(base_def),{
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description = S("Sloped Rail"), -- Temporary name to make debugging easier
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_mcl_minecarts = {
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get_next_dir = rail_dir_cross,
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},
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tiles = { tiles[1] },
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}))
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-- Cross variant
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--[[
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mod.register_rail(base_name.."_cross", table_merge(table.copy(base_def),{
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tiles = { tiles[4] },
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tiles = { tiles[5] },
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groups = {
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not_in_creative_inventory = 1,
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},
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}))
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]]
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end
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mod.register_curves_rail = register_curves_rail
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register_curves_rail("mcl_minecarts:rail_v2", {
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