[Webkit-unassigned] [Bug 219023] Blank glReadPixels since iOS 14.2

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219023

--- Comment #2 from Kimmo Kinnunen <kkinnunen at apple.com> ---
Thanks for the report, sorry it took so long to look at it.
I can repro the issue.

I can see the webgl element is depth==false, antialias==false, preserveDrawingBuffer==false.

In case it is easy for you to provide more info:
Would you have any more details on how you do glReadPixels?
1) is it reading the default Framebuffer or user-defined Framebuffer?
If it is user-defined:
2) What format is the texture attachment? Does the texture attachment have alpha?
3) Anything out-of-ordinary with the framebuffer?

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