Before gates on underground layer didn't had any channel assigned and of course any function that attempt to check -1 channel caused crash.
Also I find out that at point postInit executed It's possible to get mutable gamestate via gameState() callback so we don't need to pass it there.
Each kind of teleporter have own function that determine if it's should or shouldn't be used.
For now Monolith with bidirectional channels and Subterranean Gate are united.
Transit is new option for hero movement. If it passed for movement then hero can get get on tile without visiting of object on it.
Currently it's will be only allowed is object under destination is teleport.
Just like TeleportDialog it's based off showBlockingDialog, but as number of package is higher when possible showTeleportDialog will be after other dialogs handling code.
TeleportDialog is based off BlockingDialog and it's needed for server to ask client what teleport hero should be teleported to.
It's also contain list of possible exits, identifier of currently used channel and also impassable option.
If impassable set to true then client will remember that current teleport channel is lack of exit point.
This code belongs to callback because both player and AI shouldn't directly access information about teleport channels.
For example pathfinder code need to check teleport channel type only based on information about objects player already seen.
Now CGTeleport is not publicly available handler, but generic class for teleport channels usage.
Teleport channels are stored as part of information about the map.
TeleportChannel is structure that contain two vectors of entrances and exits for certain teleport channel. It's also store passability state independently which almost only useful for Player and AI as they can't know if channel passible or not until enough entrances / exits are visible or server passed them information that certain channel is impassible when they visited entrance.
ETeleportChannelType is determined by checking intersection between entrances and exit vectors or checking their size:
- IMPASSABLE: one of vectors empty or only one entrance id is same as only one exit id.
- BIDIRECTIONAL: contents of both vectors is exactly the same.
- UNIDIRECTIONAL: contents of both vectors do not intersect.
- MIXED: contents of vectors only partially intersect. Not currently used; added for future modding.
