Bug 314201

Summary: [TextureMapper] Round-clip shader needs highp on PowerVR B-Series
Product: WebKit Reporter: Simon Pena <spena>
Component: WPE WebKitAssignee: Simon Pena <spena>
Status: RESOLVED FIXED    
Severity: Normal CC: bugs-noreply
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Visual glitch when clipping
none
Visual glitch when clipping fixed none

Simon Pena
Reported 2026-05-06 08:15:28 PDT
The GLSL helpers used by applyRoundedRectClip (ellipsisDist, ellipsisCoverage, roundedRectCoverage) compute corner coverage as (dot(p0,p0) - 1.0) / length(p1). On some proprietary GLES drivers this form is miscomputed under mediump (fp16).
Attachments
Visual glitch when clipping (8.54 KB, image/png)
2026-05-06 08:25 PDT, Simon Pena 		no flags
Details
Visual glitch when clipping fixed (14.10 KB, image/png)
2026-05-06 08:26 PDT, Simon Pena 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Simon Pena
Comment 1 2026-05-06 08:25:46 PDT
Created attachment 479499 [details] Visual glitch when clipping
Simon Pena
Comment 2 2026-05-06 08:26:41 PDT
Created attachment 479500 [details] Visual glitch when clipping fixed
Simon Pena
Comment 3 2026-05-06 08:57:04 PDT
Pull request: https://github.com/WebKit/WebKit/pull/64372
EWS
Comment 4 2026-05-07 09:19:27 PDT
Committed 312802@main (74a41b5f4ec4): <https://commits.webkit.org/312802@main> Reviewed commits have been landed. Closing PR #64372 and removing active labels.
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