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--nodedb.lua
--database of all nodes that have 'save_in_at_nodedb' field set to true in node definition
ndb_nodes_notrack = 0
--serialization format:
--(2byte z) (2byte y) (2byte x) (2byte contentid)
--contentid := (14bit nodeid, 2bit param2)
local function int_to_bytes(i)
local x=i+32768--clip to positive integers
local cH = math.floor(x / 256) % 256;
local cL = math.floor(x ) % 256;
return(string.char(cH, cL));
end
local function bytes_to_int(bytes)
local t={string.byte(bytes,1,-1)}
local n =
t[1] * 256 +
t[2]
return n-32768
end
local function l2b(x)
return x%4
end
local function u14b(x)
return math.floor(x/4)
end
local ndb={}
--local variables for performance
local ndb_nodeids={}
local ndb_nodes={}
local function ndbget(x,y,z)
local ny=ndb_nodes[y]
if ny then
local nx=ny[x]
if nx then
return nx[z]
end
end
return nil
end
local function ndbset(x,y,z,v)
if not ndb_nodes[y] then
ndb_nodes[y]={}
end
if not ndb_nodes[y][x] then
ndb_nodes[y][x]={}
end
ndb_nodes[y][x][z]=v
end
local path="advtrains_ndb2"
--load
--nodeids get loaded by advtrains init.lua and passed here
function ndb.load_data(data)
ndb_nodeids = data and data.nodeids or {}
local file, err = io.open(datapath..path, "rb")
if not file then
print("Couldn't load the node database: ", err or "Unknown Error")
else
local cnt=0
local hst_z=file:read(2)
local hst_y=file:read(2)
local hst_x=file:read(2)
local cid=file:read(2)
while hst_z and hst_y and hst_x and cid and #hst_z==2 and #hst_y==2 and #hst_x==2 and #cid==2 do
ndbset(bytes_to_int(hst_x), bytes_to_int(hst_y), bytes_to_int(hst_z), bytes_to_int(cid))
cnt=cnt+1
hst_z=file:read(2)
hst_y=file:read(2)
hst_x=file:read(2)
cid=file:read(2)
end
print("nodedb: read", cnt, "nodes.")
ndb_nodes_total = cnt
file:close()
end
end
--function to get node. track database is not helpful here.
function ndb.get_node_or_nil(pos)
-- FIX for bug found on linuxworks server:
-- a loaded node might get read before the LBM has updated its state, resulting in wrongly set signals and switches
-- -> Using the saved node prioritarily.
local node = ndb.get_node_raw(pos)
if node then
return node
else
-- no minetest here
return nil
end
end
function ndb.get_node(pos)
local n=ndb.get_node_or_nil(pos)
if not n then
return {name="ignore", param2=0}
end
return n
end
function ndb.get_node_raw(pos)
local cid=ndbget(pos.x, pos.y, pos.z)
if cid then
local nodeid = ndb_nodeids[u14b(cid)]
if nodeid then
return {name=nodeid, param2 = l2b(cid)}
end
end
return nil
end
function ndb.clear(pos)
ndbset(pos.x, pos.y, pos.z, nil)
end
--get_node with pseudoload. now we only need track data, so we can use the trackdb as second fallback
--nothing new will be saved inside the trackdb.
--returns:
--true, conn1, conn2, rely1, rely2, railheight in case everything's right.
--false if it's not a rail or the train does not drive on this rail, but it is loaded or
--nil if the node is neither loaded nor in trackdb
--the distraction between false and nil will be needed only in special cases.(train initpos)
function advtrains.get_rail_info_at(pos)
local rdp=advtrains.round_vector_floor_y(pos)
local node=ndb.get_node_or_nil(rdp)
if not node then return end
local nodename=node.name
local conns, railheight, tracktype=advtrains.get_track_connections(node.name, node.param2)
if not conns then
return false
end
return true, conns, railheight
end
-- mapper-specific
function ndb.mapper_find_starting_point()
for y, ty in pairs(ndb_nodes) do
for x, tx in pairs(ty) do
for z, v in pairs(tx) do
local pos = {x=x, y=y, z=z}
local node_ok, conns, _ = advtrains.get_rail_info_at(pos)
if node_ok then
return pos, conns
else
-- this is a signal or something similar, ignore.
tx[z]=nil
ndb_nodes_notrack = ndb_nodes_notrack + 1
end
end
end
end
end
advtrains.ndb = ndb