Proof-of-concept fix for window resize on Metal. <...

# compose-desktop

[Alexander Maryanovsky]

Proof-of-concept fix for window resize on Metal.
@Konstantin Tskhovrebov

Screen Recording 2026-07-01 at 15.20.02.mov

[Sergey Y.]

Wow, really smooth. Nice work, congrats.
I’m working on a similar render-buffer fix in my project, so I’m curious: how did you solve it? My guess is bucketed buffer pooling, or something close to that. I honestly don’t know another good way to fix this at the window level. Did I guess right?

[Alexander Maryanovsky]

The crucial point that we were missing before is that the rendering needs to be driven from the AppKit main thread, not from the AWT event dispatching thread.

[Adam Brown]

damn, that is smooth!

[Max]

Damn, So fast

[Alexander Maryanovsky]

It’s still only a proof-of-concept; there are problems with it that I need to solve first.
But the point that it proves is that the root cause is not a performance issue. Kotlin/JVM is absolutely fast enough for smooth window resizing.