Material issues on Mac/iOS with Metal

[Gabby Getz]

Hi all,

We've received reports of materials in CesiumJS(https://github.com/CesiumGS/cesium/issues/9827), including translucent and dashed materials, on iOS devices using WebGL via Metal.

We were hoping this would have been fixed with the latest WebGL related fixes that went out with Safari 15.5, but that doesn't appear to be the case.

Disabling order independent translucent appears to remedy the issue, so we're working on narrowing the issue down to a specific extension, though we believe it may be related to EXT_color_buffer_float.  In the meantime, have others run into a similar issue? If not, we can file a new report with Webkit.

Thanks!
Gabby

[Gabby Getz]

Hi all, 

We've received reports of issues with materials in CesiumJS (https://github.com/CesiumGS/cesium/issues/9827), including translucent and dashed materials, on iOS devices using WebGL via Metal.

We were hoping this would have been fixed with the latest WebGL related fixes that went out with Safari 15.5, but that doesn't appear to be the case.

Disabling order independent translucent appears to remedy the issue, so we're working on narrowing the issue down to a specific extension, though we believe it may be related to EXT_color_buffer_float.  In the meantime, have others run into a similar issue? If not we can file a new report wit Webkit.

Thanks,
Gabby

[Ken Russell]

Hi Gabby,

Thanks for reaching out and sorry for the moderation problem that held up your messages for so long - the moderation messages went into my spam folder for some reason.

Darn, it's unfortunate that the Safari 15.5 release didn't address this.

Please do file a bug on bugs.webkit.org and post the URL of it here. I can't reproduce this behavior on an M1 MacBook Pro (which often reproduces issues seen on iOS hardware), so Apple engineers will have to triage it since only they can build WebKit for iOS.

-Ken

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[Gabby Getz]

Thanks Ken! Please excuse the spam from my other submission attempts!

I've opened https://bugs.webkit.org/show_bug.cgi?id=240919.