replace trackdb by nodedb

- trackdb is kept for large rail networks to still work but not saved anymore
- saving node name and param2 instead of track connections, so also signals can be saved.
- small serialization format
- fast access times, almost no redundancy

1 files changed, 27 insertions, 0 deletions

diff --git a/advtrains/advtrains/trackdb_legacy.lua b/advtrains/advtrains/trackdb_legacy.lua
new file mode 100644
index 0000000..99349e8
--- /dev/null
+++ b/advtrains/advtrains/trackdb_legacy.lua
@@ -0,0 +1,27 @@
+--trackdb_legacy.lua
+--loads the (old) track database. the only use for this is to provide data for rails that haven't been written into the ndb database.
+--nothing will be saved.
+--if the user thinks that he has loaded every track in his world at least once, he can delete the track database.
+
+--trackdb[[y][x][z]={conn1, conn2, rely1, rely2, railheight}
+
+
+--trackdb keeps its own save file.
+advtrains.fpath_tdb=minetest.get_worldpath().."/advtrains_trackdb2"
+local file, err = io.open(advtrains.fpath_tdb, "r")
+if not file then
+	atprint("Not loading a trackdb file.")
+else
+	local tbl = minetest.deserialize(file:read("*a"))
+	if type(tbl) == "table" then
+		advtrains.trackdb=tbl
+		atprint("Loaded trackdb file.")
+	end
+	file:close()
+end
+	
+
+
+
+
+