Bug 139024

Summary: WebGL Shader corruption with iPhone 5 on iOS 8.1.1
Product: WebKit Reporter: Mark Perris <markperris>
Component: WebGLAssignee: Nobody <webkit-unassigned>
Status: RESOLVED CONFIGURATION CHANGED    
Severity: Normal CC: dino, kkinnunen, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: 528+ (Nightly build)   
Hardware: iPhone / iPad   
OS: iOS 8.1   
URL: http://sqr.bartekdrozdz.com/html/lab/gl_ssao/
Attachments:
Description Flags
Screenshot of corruption visible on an iPhone 5. none

Mark Perris
Reported 2014-11-24 03:43:59 PST
Created attachment 242155 [details] Screenshot of corruption visible on an iPhone 5. Running the following example on an iPhone 5 with iOS 8.1.1 causes corrupted output, per the screenshot attached. http://sqr.bartekdrozdz.com/html/lab/gl_ssao/ The same style of corruption is also visible on certain examples on ShaderToy. The ShaderToy examples work correctly with an iPhone 6, suggesting it could be a driver bug. I'll test this specific example on an iPhone 6 when I head past the Apple Store tonight.
Attachments
Screenshot of corruption visible on an iPhone 5. (306.42 KB, image/png)
2014-11-24 03:43 PST, Mark Perris 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Mark Perris
Comment 1 2014-11-24 09:25:08 PST
I can confirm in this specific example, the bug is also present on the iPhone 6, though with slightly different artefacts.
Dean Jackson
Comment 2 2014-11-24 19:13:30 PST
Thanks!
Radar WebKit Bug Importer
Comment 3 2014-11-24 19:13:44 PST
<rdar://problem/19076434>
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