Unreal Tournament 1999 is too fast

[OlegAckbar]

Unreal Tournament 1999 is too fast even with framerate cap applied. I'm using it in conjuncture with sdl12-compat and sdl2-compat, but there was no such problem with just sdl2.

ut99fast.webm

[icculus]

Downloading the (now actually legal!) .isos from archive.org. :)

I haven't looked at this specific bug yet, but I remember at some point UT99 did something similar to this if your FPS was really high...some delta time calculation would go to zero and everything would just go into fast-forward.

So I'm wondering if vsync accidentally got turned off for a game that was designed to run well on an ATI Rage128.

I could be totally wrong, I'll know more soon though.

[icculus]

This is working for me (at 1000fps, lol) using sdl2-compat with the latest OldUnreal patch, but if my initial idea is right, it's 100% possible they fixed this. Is there a good place to get an older UT99 binary?

[madebr]

Looks like the video was created with patch 436: https://unrealarchive.org/unreal-tournament/patches-updates/patches/patch-436/index.html

[icculus]

...that would be SDL 1.2, though. @OlegAckbar, is this chaining through sdl12-compat, too?

[OlegAckbar]

...that would be SDL 1.2, though. @OlegAckbar, is this chaining through sdl12-compat, too?

My version is using sdl12-compat, haven't tried the latest one, will check it out

[icculus]

Okay, I tried this with the final 436 binaries from Loki.

I'm getting this problem with sdl12-compat (not even chaining through sdl2-compat), so I think this is the bug I described and not something we can fix (beyond maybe adding a quirk to force vsync on).

This bug appears to be fixed in UT99 itself if you use OldUnreal's Linux binaries, which also gets you x86-64 binaries (and wow, ARM64, too) ... https://github.com/OldUnreal/UnrealTournamentPatches

[icculus]

Exporting the SDL12COMPAT_SYNC_TO_VBLANK=1 environment variable fixes it, of course. Should we add this as a quirk to sdl12-compat for binaries named ut-bin?

[slouken]

Exporting the SDL12COMPAT_SYNC_TO_VBLANK=1 environment variable fixes it, of course. Should we add this as a quirk to sdl12-compat for binaries named ut-bin?

Yes, that seems like a good idea.

[OlegAckbar]

Exporting the SDL12COMPAT_SYNC_TO_VBLANK=1 environment variable fixes it, of course. Should we add this as a quirk to sdl12-compat for binaries named ut-bin?

Setting SDL12COMPAT_SYNC_TO_VBLANK=1 didn't fix it for me, although I'm using KWin Wayland from cachyos repos which is compiled with fifo-v1. Maybe it has something to do with it? No, it has nothing to do with it I just checked.
OldUnreal libraries indeed don't have that issue

[icculus]

I added the vsync stuff to sdl12-compat; I'm not really sure what else to do with this in sdl2-compat, and OldUnreal has binaries available for modern systems with a ton of good fixes, making further research on this low priority.