diff options
Diffstat (limited to 'pseudoload.lua')
| -rw-r--r-- | pseudoload.lua | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/pseudoload.lua b/pseudoload.lua new file mode 100644 index 0000000..532b429 --- /dev/null +++ b/pseudoload.lua @@ -0,0 +1,121 @@ + +--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[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 +advtrains.pl_fpath=minetest.get_worldpath().."/advtrains_trackdb" +local file, err = io.open(advtrains.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[y] then advtrains.trackdb[y]={} end + if not advtrains.trackdb[y][x] then advtrains.trackdb[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[y][x][z]={ + conn1=conn1, conn2=conn2, + rely1=rely1, rely2=rely2, + railheight=railheight + } + else + advtrains.trackdb[y][x][z]={ + conn1=conn1, conn2=conn2 + } + end + else + advtrains.trackdb[y][x][z]={ + conn1=conn1, conn2=conn2 + } + end + end + file:close() +end +function advtrains.save_trackdb() + local file, err = io.open(advtrains.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) 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 + +--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[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[rdp.y][rdp.x][rdp.z] then--TODO is this write prevention here really needed? + 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 + + |