[Webkit-unassigned] [Bug 135387] [Mac, iOS] Video upload to texture performance way too slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135387

--- Comment #6 from Marcin <msokalski at novomatic-tech.com> ---
I gave it a quick check:
My test uses 2 textures to ensure upload and render does not need to wait for each other, and uploads new frame every second rendered frame (video is 30fps, 540x960, QuickTime HEVC with alpha channel).

On iMac ~2017, I'm able to hit 60fps easily while tex[Sub]Imaging video but I think Safari presents only half of rendered frames. Looks like bottle neck is still there but have moved to another thread.

On the other hand, iPhone SE 2017 is definitely blocked right in the tex[Sub]Image2D call, not much changed here, max 50 fps.

And the winner is iPad Air 2020, works really well (60fps, all frames are presented), I didn't have a chance to test it with previous version of iOS.

Could it be that performance on older devices (2017) is limited by lack of hardware accelerated H265 codec?

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