Some blend functions cause corruption and freezes

[VisualEhrmanntraut]

Software like Chrome and Sublime Text 4 can cause corruption and freezes.

To Reproduce

1. Open software which uses dual source blend like Chrome and Sublime Text 4
2. Observe

Expected behavior
The software working perfectly fine.

Screenshots

[VisualEhrmanntraut]

ANGLE is for WebGL. Nothing to do with Chrome itself glitching out.

[VisualEhrmanntraut]

Talking about that workaround... I just realised something:
With the VTable wrap hack the team ex-member came up with, if the called function inside the wrap calls another virtual function in the this pointer, then the wrong function gets called

[VisualEhrmanntraut]

(The VTable hack has to do with HWAlignManager used inside it for calculations)

[revogabe]

@VisualEhrmanntraut Do you have any predictions if we can have any solution for chrome-based browsers natively in the future?

[VisualEhrmanntraut]

New prediction available: No prediction available.

[txrm]

DOSBOX's OpenGL freezes the system immediately, looking into what triggers it since it's a fast and reliable crash.

Config field is output = surface | overlay | opengl | openglnb | ddraw

[kyvaith]

I would hate to spoil your peace of mind @VisualEhrmanntraut, but do you perhaps have an assumed date for pushing the latest changes you did to the repository? I would be very grateful for this 😉

[VisualEhrmanntraut]

These were Catalina-only tests made to find the reason for the crashes rather than a fix. There is no fix available, neither is a fix easy due to the design of Lilu. I am planning to make a Lilu replacement before I try to actually fix it.

[kyvaith]

Oh, I thought Chrome would eventually work on Sonoma. I understand now that it takes more time and it's impossible to predict if and when you'll be able to solve the problem. Thank you.

[VisualEhrmanntraut]

The cause seems to be multiple issues at once unfortunately. It seems to be that I'll have to also remove that last bit that I currently steal from the navi drivers to fix the issue in addition to fixing the user-space code. This is going to take a looot of time and effort...

[AlfCraft07]

For me, Minecraft works just fine in Sequoia, even better than Windows.

[VisualEhrmanntraut]

I've just received some very crucial data. On a person's system, the screen corruption magically reverted. This reinforces my thoughts on the issue, and I think getting rid of what I mentioned previously will fix it!

[VisualEhrmanntraut]

it no worky

[phpete1]

it no worky

Have you tried switching it off and on again?

[phpete1]

it no worky

In all seriousness, can't wait to see a fix for this, hopefully

[AlfCraft07]

My pc with Minecraft Java (that uses OpenGL) doesn’t do that; the game runs even smoother than in Windows

[VisualEhrmanntraut]

This is Sublime Text 4.

[AlfCraft07]

Ok. So it happens on Chrome, and is there any other app that can make it happen?

[ChitoKim]

League of Legends client(also opengl) used to crack like shit before. As I use the latest nightly kext it was fixed.

[JuniorHerakuresu]

League of Legends client(also opengl) used to crack like shit before. As I use the latest nightly kext it was fixed.

It glitches for me with nightly but a "bit" less than other times, but still annoying

[divasgt]

Ok. So it happens on Chrome, and is there any other app that can make it happen?

it happens when opening canva.com on firefox, and on chromium based browsers and apps i have to turn off graphics acceleration then they give no issue but then they uses high cpu and makes my laptop hotter

[techmare]

@divasgt Yes same here

[aidanbae123]

I use a site called notion for my studies and it used to crash any chromium or even firebox browser when simply opening the site. I installed the most recent nightly build and it no longer crashes my browser. However, the standalone app still causes severe graphical glitches and crashes my entire system if not closed in time. Either way, glad to see good progress.

[aidanbae123]

Also one thing I notices just now is that discord now seems to be crashing with slight graphical glitches which eventually becomes a blank grey tab. Not sure if this is the same issue but it was working fine before.

[pokewizardSAM]

Also one thing I notices just now is that discord now seems to be crashing with slight graphical glitches which eventually becomes a blank grey tab. Not sure if this is the same issue but it was working fine before.

from the last update or past 3-4 days mine does that too.

[aidanbae123]

yeah, I double checked by opening discord on arc (chromium-based) and it seems to be crashing as well. Works fine on safari though.

[diandiweb]

Programs that require hardware acceleration will crash

[aidanbae123]

Yeah I am very well aware of that, but my point was it wasn't crashing before

[frezyn]

i have same problem, Some fix to that?

[VisualEhrmanntraut]

We have found what causes the corruption; it's dual source blend. Switching ANGLE to OpenGL and ANGLE feature flags to disableBlendFuncExtended fixes the corruption. Sublime Text also uses this feature.
EDIT: Not always. It seems to be blending functions in general that are problematic.