User skin sprites display opacity different under Metal

[peppy]

This needs investigation. We're potentially still doing premultiplied alpha wrong.

Discussed in #30148

^{Originally posted by cdwcgt October 9, 2024}
on iOS(iPadOS) and MacOS:

on iOS(iPadOS) and MacOS	on Windows

The fruit is noticeably darker

on iOS(iPadOS) and MacOS	on Windows

The area around the cursor(and tail) is noticeably darker

std skin: https://files.catbox.moe/01isxd.osk
ctb skin: https://files.catbox.moe/f7172e or https://www.swisstransfer.com/d/d800340d-c3b0-4244-92ca-56a4a3932087

[smoogipoo]

The issue says iOS and macOS, but I can't replicate on macOS. And I'm very well aware that this is an issue on iOS, I've both been told IRL many times how shocking the cursor trail looks and I think there's an o!f issue for that already.

But, for macOS, can anyone confirm this to be broken there?

[peppy]

Definitely going to be iOS/iPadOS only. Skins look fine here on macOS.

[Joehuu]

Same here.

The framework issue is ppy/osu-framework#2194. Not sure what the stance is now on having the same issue in framework and here for visibility. I would close in this case because it's only on iOS and is only visual.

[smoogipoo]

Let's close this one and keep tracking there.