433 lines
12 KiB
Lua
433 lines
12 KiB
Lua
--[[
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Tube Library 2
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==============
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Copyright (C) 2018-2020 Joachim Stolberg
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LGPLv2.1+
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See LICENSE.txt for more information
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internal.lua
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]]--
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-- for lazy programmers
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local S = function(pos) if pos then return minetest.pos_to_string(pos) end end
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local P = minetest.string_to_pos
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local M = minetest.get_meta
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-- Load support for intllib.
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local MP = minetest.get_modpath("tubelib2")
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local I,IS = dofile(MP.."/intllib.lua")
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local Tube = {}
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local Turn180Deg = {[0]=0,3,4,1,2,6,5}
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-- To calculate param2 based on dir6d information
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local DirToParam2 = {
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-- dir1 / dir2 ==> param2 / type (Angled/Straight)
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[12] = {11, "A"},
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[13] = {12, "S"},
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[14] = {14, "A"},
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[15] = { 8, "A"},
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[16] = {10, "A"},
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[23] = { 7, "A"},
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[24] = {21, "S"},
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[25] = { 3, "A"},
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[26] = {19, "A"},
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[34] = { 5, "A"},
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[35] = { 0, "A"},
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[36] = {20, "A"},
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[45] = {15, "A"},
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[46] = {13, "A"},
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[56] = { 4, "S"},
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}
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-- To retrieve dir6d values from the nodes param2
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local Param2ToDir = {}
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for k,item in pairs(DirToParam2) do
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Param2ToDir[item[1]] = k
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end
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-- For neighbour position calculation
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local Dir6dToVector = {[0] =
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{x=0, y=0, z=0},
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{x=0, y=0, z=1},
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{x=1, y=0, z=0},
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{x=0, y=0, z=-1},
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{x=-1, y=0, z=0},
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{x=0, y=-1, z=0},
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{x=0, y=1, z=0},
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}
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tubelib2.Tube = Tube
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tubelib2.Turn180Deg = Turn180Deg
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tubelib2.DirToParam2 = DirToParam2
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tubelib2.Param2ToDir = Param2ToDir
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tubelib2.Dir6dToVector = Dir6dToVector
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--
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-- Tubelib2 Methods
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--
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function Tube:get_node_lvm(pos)
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local node = minetest.get_node_or_nil(pos)
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if node then
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return node
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end
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local vm = minetest.get_voxel_manip()
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local MinEdge, MaxEdge = vm:read_from_map(pos, pos)
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local data = vm:get_data()
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local param2_data = vm:get_param2_data()
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local area = VoxelArea:new({MinEdge = MinEdge, MaxEdge = MaxEdge})
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local idx = area:indexp(pos)
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if data[idx] and param2_data[idx] then
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return {
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name = minetest.get_name_from_content_id(data[idx]),
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param2 = param2_data[idx]
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}
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end
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return {name="ignore", param2=0}
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end
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-- Read param2 from a primary node at the given position.
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-- If dir == nil then node_pos = pos
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-- Function returns param2, new_pos or nil
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function Tube:get_primary_node_param2(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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self.node = self:get_node_lvm(npos)
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if self.primary_node_names[self.node.name] then
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return self.node.param2, npos
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end
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end
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-- Check if node at given position is a tube node
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-- If dir == nil then node_pos = pos
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-- Function returns true/false
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function Tube:is_primary_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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local node = self:get_node_lvm(npos)
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return self.primary_node_names[node.name]
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end
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-- Get secondary node at given position
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-- If dir == nil then node_pos = pos
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-- Function returns node and new_pos or nil
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function Tube:get_secondary_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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local node = self:get_node_lvm(npos)
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if self.secondary_node_names[node.name] then
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local valid_dir_string = minetest.get_meta(npos):get_string('valid_dirs')
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local valid_dirs = self.valid_dirs
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if valid_dir_string and valid_dir_string ~= "" then
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valid_dirs = minetest.deserialize(valid_dir_string)
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end
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return node, npos, valid_dirs[Turn180Deg[dir]] or false
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end
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end
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-- Get special registered nodes at given position
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-- If dir == nil then node_pos = pos
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-- Function returns node and new_pos or nil
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function Tube:get_special_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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local node = self:get_node_lvm(npos)
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if self.special_node_names[node.name] then
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return node, npos
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end
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end
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-- Check if node at given position is a secondary node
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-- If dir == nil then node_pos = pos
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-- Function returns true/false
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function Tube:is_secondary_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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local node = self:get_node_lvm(npos)
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return self.secondary_node_names[node.name]
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end
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-- Check if node at given position is a special node
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-- If dir == nil then node_pos = pos
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-- Function returns true/false
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function Tube:is_special_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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local node = self:get_node_lvm(npos)
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return self.special_node_names[node.name]
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end
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-- Check if node has a connection on the given dir
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function Tube:connected(pos, dir)
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return self:is_primary_node(pos, dir) or self:is_secondary_node(pos, dir)
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end
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function Tube:get_next_tube(pos, dir)
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local param2, npos = self:get_primary_node_param2(pos, dir)
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if param2 then
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local val = Param2ToDir[param2 % 32] or 0
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local dir1, dir2 = math.floor(val / 10), val % 10
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local num_conn = math.floor(param2 / 32) or 0
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if Turn180Deg[dir] == dir1 then
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return npos, dir2, num_conn
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else
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return npos, dir1, num_conn
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end
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end
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return self:get_next_teleport_node(pos, dir)
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end
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-- Return param2 and tube type ("A"/"S")
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function Tube:encode_param2(dir1, dir2, num_conn)
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if dir1 and dir2 and num_conn then
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if dir1 > dir2 then
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dir1, dir2 = dir2, dir1
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end
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local param2, _type = unpack(DirToParam2[dir1 * 10 + dir2] or {0, "S"})
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return (num_conn * 32) + param2, _type
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end
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return 0, "S"
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end
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-- Return dir1, dir2, num_conn
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function Tube:decode_param2(pos, param2)
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local val = Param2ToDir[param2 % 32]
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if val then
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local dir1, dir2 = math.floor(val / 10), val % 10
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local num_conn = math.floor(param2 / 32)
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return dir1, dir2, num_conn
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end
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end
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function Tube:repair_tube(pos, dir)
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local param2, npos = self:get_primary_node_param2(pos, dir)
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if param2 then
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local dir1, dir2 = self:decode_param2(npos, param2)
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local param2, tube_type = self:encode_param2(dir1, dir2, 2)
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self.clbk_after_place_tube(npos, param2, tube_type, 2)
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end
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end
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-- Return node next to pos in direction 'dir'
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function Tube:get_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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return npos, self:get_node_lvm(npos)
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end
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-- format and return given data as table
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function Tube:get_tube_data(pos, dir1, dir2, num_tubes, state)
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local param2, tube_type = self:encode_param2(dir1, dir2, num_tubes)
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return pos, param2, tube_type, num_tubes, state
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end
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-- Return pos for a primary_node and true if num_conn < 2, else false
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function Tube:friendly_primary_node(pos, dir)
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local param2, npos = self:get_primary_node_param2(pos, dir)
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if param2 then
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local _,_,num_conn = self:decode_param2(npos, param2)
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-- tube node with max one connection?
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return npos, (num_conn or 2) < 2
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end
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end
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function Tube:vector_to_dir(v)
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if v.y > 0 then
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return 6
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elseif v.y < 0 then
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return 5
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else
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return minetest.dir_to_facedir(v) + 1
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end
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end
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-- Check all 6 possible positions for known nodes considering preferred_pos
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-- and the players fdir and return dir1, dir2 and the number of tubes to connect to (0..2).
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function Tube:determine_tube_dirs(pos, preferred_pos, fdir)
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local tbl = {}
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local allowed = table.copy(self.valid_dirs)
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-- If the node at players "prefered position" is a tube,
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-- then the other side of the new tube shall point to the player.
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if preferred_pos then
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local _, friendly = self:friendly_primary_node(preferred_pos)
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if friendly then
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local v = vector.direction(pos, preferred_pos)
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local dir1 = self:vector_to_dir(v)
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local dir2 = Turn180Deg[fdir]
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return dir1, dir2, 1
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end
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end
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-- Check for primary nodes (tubes)
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for dir = 1,6 do
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if allowed[dir] then
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local npos, friendly = self:friendly_primary_node(pos, dir)
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if npos then
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if not friendly then
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allowed[dir] = false
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else
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if preferred_pos and vector.equals(npos, preferred_pos) then
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preferred_pos = nil
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table.insert(tbl, 1, dir)
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else
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table.insert(tbl, dir)
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end
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end
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end
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end
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end
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-- If no tube around the pointed pos and player prefers a position,
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-- then the new tube shall point to the player.
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if #tbl == 0 and preferred_pos and fdir and allowed[Turn180Deg[fdir]] then
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tbl[1] = Turn180Deg[fdir]
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-- Already 2 dirs found?
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elseif #tbl >= 2 then
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return tbl[1], tbl[2], 2
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end
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-- Check for secondary nodes (chests and so on)
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for dir = 1,6 do
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if allowed[dir] then
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local _,npos,allow = self:get_secondary_node(pos, dir)
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if npos then
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if not allow then
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allowed[dir] = false
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else
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if preferred_pos and vector.equals(npos, preferred_pos) then
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preferred_pos = nil
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table.insert(tbl, 2, dir)
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else
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table.insert(tbl, dir)
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end
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end
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end
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end
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end
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-- player pointed to an unknown node to force the tube orientation?
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if preferred_pos and fdir then
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if tbl[1] == Turn180Deg[fdir] and allowed[fdir] then
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tbl[2] = fdir
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elseif allowed[Turn180Deg[fdir]] then
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tbl[2] = Turn180Deg[fdir]
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end
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end
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-- dir1, dir2 still unknown?
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if fdir then
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if #tbl == 0 and allowed[Turn180Deg[fdir]] then
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tbl[1] = Turn180Deg[fdir]
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end
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if #tbl == 1 and allowed[Turn180Deg[tbl[1]]] then
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tbl[2] = Turn180Deg[tbl[1]]
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elseif #tbl == 1 and tbl[1] ~= Turn180Deg[fdir] and allowed[Turn180Deg[fdir]] then
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tbl[2] = Turn180Deg[fdir]
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end
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end
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if #tbl >= 2 and tbl[1] ~= tbl[2] then
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local num_tubes = (self:connected(pos, tbl[1]) and 1 or 0) +
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(self:connected(pos, tbl[2]) and 1 or 0)
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return tbl[1], tbl[2], math.min(2, num_tubes)
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end
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end
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-- Determine a tube side without connection, increment the number of connections
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-- and return the new data to be able to update the node:
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-- new_pos, dir1, dir2, num_connections (1, 2)
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function Tube:add_tube_dir(pos, dir)
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local param2, npos = self:get_primary_node_param2(pos, dir)
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if param2 then
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local d1, d2, num = self:decode_param2(npos, param2)
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if not num then return end
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-- not already connected to the new tube?
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dir = Turn180Deg[dir]
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if d1 ~= dir and dir ~= d2 then
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if num == 0 then
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d1 = dir
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elseif num == 1 then
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-- determine, which of d1, d2 has already a connection
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if self:connected(npos, d1) then
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d2 = dir
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else
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d1 = dir
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end
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end
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end
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return npos, d1, d2, num
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end
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end
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-- Decrement the number of tube connections
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-- and return the new data to be able to update the node:
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-- new_pos, dir1, dir2, num_connections (0, 1)
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function Tube:del_tube_dir(pos, dir)
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local param2, npos = self:get_primary_node_param2(pos, dir)
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if param2 then
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local d1, d2, num = self:decode_param2(npos, param2)
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-- check if node is connected to the given pos
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dir = Turn180Deg[dir]
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if d1 == dir or dir == d2 then
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return npos, d1, d2, math.max((num or 1) - 1, 0)
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end
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end
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end
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-- Pairing helper function
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function Tube:store_teleport_data(pos, peer_pos)
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local meta = M(pos)
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meta:set_string("tele_pos", S(peer_pos))
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meta:set_string("channel", nil)
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meta:set_string("formspec", nil)
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meta:set_string("infotext", I("Connected with ")..S(peer_pos))
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return meta:get_int("tube_dir")
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end
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-- Jump over the teleport nodes to the next tube node
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function Tube:get_next_teleport_node(pos, dir)
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if pos then
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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local meta = M(npos)
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local s = meta:get_string("tele_pos")
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if s ~= "" then
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local tele_pos = P(s)
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local tube_dir = M(tele_pos):get_int("tube_dir")
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if tube_dir ~= 0 then
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return tele_pos, tube_dir
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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 Tube:dbg_out()
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for pos1,item1 in pairs(self.connCache) do
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for dir1,item2 in pairs(item1) do
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print("pos1="..pos1..", dir1="..dir1..", pos2="..S(item2.pos2)..", dir2="..item2.dir2)
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end
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end
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end
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-- Walk to the end of the tube line and return pos and outdir of both head tube nodes.
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-- If no tube is available, return nil
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function Tube:walk_tube_line(pos, dir)
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local cnt = 0
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if dir then
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while cnt <= self.max_tube_length do
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local new_pos, new_dir, num = self:get_next_tube(pos, dir)
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if not new_pos then break end
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if cnt > 0 and num ~= 2 and self:is_primary_node(new_pos, new_dir) then
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self:repair_tube(new_pos, new_dir)
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end
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pos, dir = new_pos, new_dir
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cnt = cnt + 1
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end
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if cnt > 0 then
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return pos, dir, cnt
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end
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end
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return table.copy(pos), dir, 0
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end
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