Artifacts around widgets when fullscreen

[khuttun]

Hi! I'm just getting started with egui and it seems like a really nice and well thought out library. I'm running into an issue though. When running my application fullscreen, I get this weird artifact around the widget I'm creating with egui:

When running it in a window, there's no artifact and the widget is displayed as it should with the shadow:

Any idea what could cause this? I'm doing my own integration with wgpu and winit running on macOS.

[emilk]

I have no idea - never seen this before. I'm pretty sure the problem is not in egui though :)

Maybe a division by zero in your shader (e.g. if you are trying to unmultiply the alpha) ?

[khuttun]

Thanks for the reply. Yeah, it's probably not egui, I just figured that maybe someone here would have seen something similar. The funny thing is that the artifact goes away and everything is displayed correctly if I draw in a window with the same inner size as the fullscreen resolution is. 🤷‍♂️ I don't think there's any /0 possibility in the shader, but maybe it's an issue somewhere else in my code. The debugging continues...

[khuttun]

Ok, so I discovered that the artifact goes away when I disable VSync from Quartz Debug. This leads me to believe that this is actually some macOS issue, possibly related to this.

[khuttun]

And also the artifact appears only when using the built-in Intel graphics chip, not with the Radeon Pro also in the MBP I'm testing with, so it seems to be the same issue as the one linked above.