[Webkit-unassigned] [Bug 237434] Precision issue in in Vertex Shader on iPads/M1 (but work on Intel Mac)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237434

--- Comment #1 from Kenneth Russell <kbr at google.com> ---
Can confirm that when zooming in and dragging around the picture of the dogs, the right canvas's crosshairs jitter on an M1 MacBook Pro with both:

Safari Version 15.3 (17612.4.9.1.8)
Safari Technology Preview Release 140 (Safari 15.4, WebKit 17614.1.1.5)

However, somewhat suprisingly, it renders smoothly with:
Chrome 101.0.4921.0 (Official Build) canary (arm64)

when launched from the command line forcing ANGLE's Metal backend via:

/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary --user-data-dir=/tmp/c1 --use-cmd-decoder=passthrough --use-angle=metal

This might imply that this was just fixed in top-of-tree ANGLE, but I don't remember a significant change to the shader translator in this area.

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