Note about not compressing DirectStorage games

[Aemony]

Not really a bug, but more of a head's up since I don't see it mentioned anywhere in the readme or wiki. It should probably be mentioned somewhere that the tool should not be used to compress modern DirectStorage enabled games since doing that negates the purpose of DirectStorage.

DirectStorage relies on BypassIO to skip the volume stack of Windows and achieve most of its intended CPU overhead reductions, however that I/O optimization won't engage for NTFS-compressed files.

[Iridium-IO]

Added this info to the main readme - unfortunately there's no internal way to tell whether files can be accessed via DirectStorage and there's no Steam API calls to check either.

[unni257]

Hi

Sorry for commenting on a closed issue, but I just came across this and wonder if it could help identify and skip compression of DirectStorage-enabled games?

By all accounts, that page isn't really accurate (see Corsair's blog post on the matter), but maybe it's better than nada? 🥲

[Iridium-IO]

As I said before, there's no API to access that data. SteamDB has their own way of finding that info out.

There's also the matter that just because a game supports DirectStorage, doesn't mean it will be active. Maybe once more games actually support it I'll look into it, but right now it's not worth it for less than two dozen games

[Aemony]

For reference, SteamDB just identifies DirectStorage by the inclusion of the dstorage.dll file in a few common subfolders of the game, see their ruleset here: https://github.com/SteamDatabase/FileDetectionRuleSets/blob/main/tests/types/SDK.DirectStorage.txt

[Iridium-IO]

@Aemony that's excellent, might be able to use that