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--pseudoload.lua
--responsible for keeping up a database of all rail nodes existant in the world, regardless of whether the mapchunk is loaded.
advtrains.trackdb={}
--trackdb[tt][y][x][z]={conn1, conn2, rely1, rely2, railheight}
--serialization format:
--(2byte x)(2byte y)(2byte z)(4bits conn1, 4bits conn2)[(plain rely1)|(plain rely2)|(plain railheight)]\n
--[] may be missing if 0,0,0
--load initially
for tt, _ in pairs(advtrains.all_traintypes) do
local pl_fpath=minetest.get_worldpath().."/advtrains_trackdb_"..tt
advtrains.trackdb[tt]={}
local file, err = io.open(pl_fpath, "r")
if not file then
local er=err or "Unknown Error"
print("[advtrains]Failed loading advtrains trackdb save file "..er)
else
--custom format to save memory
while true do
local xbytes=file:read(2)
if not xbytes then
break --eof reached
end
local ybytes=file:read(2)
local zbytes=file:read(2)
local x=(string.byte(xbytes[1])-128)*256+(string.byte(xbytes[2]))
local y=(string.byte(ybytes[1])-128)*256+(string.byte(ybytes[2]))
local z=(string.byte(zbytes[1])-128)*256+(string.byte(zbytes[2]))
local conn1=string.byte(file:read(1))
local conn1=string.byte(file:read(1))
if not advtrains.trackdb[tt][y] then advtrains.trackdb[tt][y]={} end
if not advtrains.trackdb[tt][y][x] then advtrains.trackdb[tt][y][x]={} end
local rest=file.read("*l")
if rest~="" then
local rely1, rely2, railheight=string.match(rest, "([^|]+)|([^|]+)|([^|]+)")
if rely1 and rely2 and railheight then
advtrains.trackdb[tt][y][x][z]={
conn1=conn1, conn2=conn2,
rely1=rely1, rely2=rely2,
railheight=railheight
}
else
advtrains.trackdb[tt][y][x][z]={
conn1=conn1, conn2=conn2
}
end
else
advtrains.trackdb[tt][y][x][z]={
conn1=conn1, conn2=conn2
}
end
end
file:close()
end
end
function advtrains.save_trackdb()
for tt, _ in pairs(advtrains.all_traintypes) do
local pl_fpath=minetest.get_worldpath().."/advtrains_trackdb_"..tt
local file, err = io.open(pl_fpath, "w")
if not file then
local er=err or "Unknown Error"
print("[advtrains]Failed saving advtrains trackdb save file "..er)
else
--custom format to save memory
for x,txl in pairs(advtrains.trackdb[tt]) do
for y,tyl in pairs(txl) do
for z,rail in pairs(tyl) do
file:write(string.char(math.floor(x/256)+128)..string.char((x%256)))
file:write(string.char(math.floor(y/256)+128)..string.char((y%256)))
file:write(string.char(math.floor(z/256)+128)..string.char((z%256)))
file:write(string.char(rail.conn1))
file:write(string.char(rail.conn2))
if (rail.rely1 and rail.rely1~=0) or (rail.rely2 and rail.rely2~=0) or (rail.railheight and rail.railheight~=0) then
file:write(rail.rely1.."|"..rail.rely2.."|"..rail.railheight)
end
file:write("\n")
end
end
end
file:close()
end
end
end
--get_node with pseudoload.
--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, traintype)
local node=minetest.get_node_or_nil(pos)
if not node then
--try raildb
local rdp=vector.round(rdp)
local dbe=advtrains.trackdb[traintype][rdp.y][rdp.x][rdp.z]
if dbe then
return true, dbe.conn1, dbe.conn2, dbe.rely1 or 0, dbe.rely2 or 0, dbe.railheight or 0
else
return nil
end
end
local nodename=node.name
if(not advtrains.is_track_and_drives_on(nodename, advtrains.all_traintypes[traintype].drives_on)) then
return false
end
local conn1, conn2, rely1, rely2, railheight=advtrains.get_track_connections(node.name, node.param2)
--already in trackdb?
local rdp=vector.round(rdp)
if not advtrains.trackdb[traintype][rdp.y][rdp.x][rdp.z] then--TODO is this necessary?
advtrains.trackdb[rdp.y][rdp.x][rdp.z]={
conn1=conn1, conn2=conn2,
rely1=rely1, rely2=rely2,
railheight=railheight
}
end
return true, conn1, conn2, rely1, rely2, railheight
end
function advtrains.reset_trackdb_position(pos)
local rdp=vector.round(pos)
for tt, _ in pairs(advtrains.all_traintypes) do
advtrains.trackdb[tt][rdp.y][rdp.x][rdp.z]=nil
advtrains.get_rail_info_at(pos, tt)--to restore it.
end
end
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