[Webkit-unassigned] [Bug 222822] WebGL2: SRGB8_ALPHA8 *sometimes* does not linearize texture color

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222822

--- Comment #4 from Brendan Duncan <brendanduncan at gmail.com> ---
Thanks for looking into it, Kimmo. I uploaded a revised version of the test, with a couple variants, whatever you need.

I put it up on my personal server if you need a quick way to test on a https server:
https://loki3d.com/test/srgb8_alpha8/srgb8_alpha8_oneFrame.html
https://loki3d.com/test/srgb8_alpha8/srgb8_alpha8_video.html
https://loki3d.com/test/srgb8_alpha8/srgb8_alpha8_compare.html

I wrapped the start in the video play promise to avoid the video not ready error, which seems to be supported on the Safari versions I tested.

One thing I noticed in this version of the test is that both MacOS and iOS always fail now. That leads me to believe the success cases I was seeing before was actually the different GL contexts getting mixed up. That seems like a bug of it's own, the different GL contexts shouldn't be affecting each other. 

My Mac details:
macOS Big Sur 11.2.2
MacBook Pro (15-inch, 2017)
Processor: 3.1 GHz Quad-Core Intel Core i7
Memory: 16 GB 2133 MHz LPDDR3
Graphics: Intel HD Graphics 630 1536 MB

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