[Webkit-unassigned] [Bug 232071] New: Hardware PCF filtering does not work on iOS 15 when using WebGL2

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232071

            Bug ID: 232071
           Summary: Hardware PCF filtering does not work on iOS 15 when
                    using WebGL2
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mvaligursky at snap.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

See https://github.com/playcanvas/engine/issues/3590#issuecomment-945994262

Hardware PCF filtering (compare sampling of depth shadow) does not seem to work on iOS 15.
It works on all other devices and platforms, including Safari 15 on MacOS.

Steps to repro:
http://playcanvas.github.io/#/graphics/shadow-cascades
in Controls, set Count to 1, resolution to around 512, filtering PCF3 (it's easier to click on sliders than slide them)
and notice how pixelated the shadows are on iOS 15 platform.

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