[Webkit-unassigned] [Bug 229508] New: Link program fails if shader contains 0.0/0.0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229508

            Bug ID: 229508
           Summary: Link program fails if shader contains 0.0/0.0
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cxiaoji at gmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

Version: Safari 15.0 (Webkit 16612.1.26.1.5)

Minimal sample to reproduce:

- Open https://codepen.io/Pessimistress/pen/dyRPjOd, link program fails with message "Internal error compiling shader with Metal backend.\nPlease submit this shader, or website as a bug to https://bugs.webkit.org"
- Change `0.0 / 0.0` to `1.0 / 0.0`, renders successfully
- Either fails in Firefox or Chrome

According to https://www.khronos.org/registry/OpenGL/specs/es/3.0/GLSL_ES_Specification_3.00.pdf, section 5.9:

"Dividing by zero does not cause an exception but does result in an unspecified value."

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