diff options
Diffstat (limited to 'nodedb.lua')
| -rw-r--r-- | nodedb.lua | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/nodedb.lua b/nodedb.lua new file mode 100644 index 0000000..f79dbbd --- /dev/null +++ b/nodedb.lua @@ -0,0 +1,163 @@ +--nodedb.lua +--database of all nodes that have 'save_in_at_nodedb' field set to true in node definition + + +--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(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.") + 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 + end + end + end + end +end + + +advtrains.ndb = ndb |