Bug 232169

Summary:	iOS15 Internal error compiling shader with Metal backend.
Product:	WebKit	Reporter:	spreadpando
Component:	WebGL	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED DUPLICATE
Severity:	Blocker	CC:	dino, kbr, kkinnunen, kpiddington, spreadpando
Priority:	P1
Version:	Safari 15
Hardware:	iPhone / iPad
OS:	Other
URL:	https://github.com/IdeaSpaceVR/aframe-particle-system-component/issues/61

Description spreadpando 2021-10-22 13:30:25 PDT

Production iOS 15 throws:
"THREE.WebGLProgram: shader error:  1281 35715 false gl.getProgramInfoLog Internal error compiling shader with Metal backend"

When using aframe particle-system component.

Unresolved as of 10/22/21
Github Issue:
https://github.com/IdeaSpaceVR/aframe-particle-system-component/issues/61

note the error codes do not seem to be consistent, but using the particle-system component will cause crashes or blatant shader glitches in iOS15.

Comment 1 Kimmo Kinnunen 2021-10-24 23:39:26 PDT

Thank you for the report.
Could you link to a simple reproduction? Either a url that runs the particular component or a simple html+js package reproducing the issue?
I could not any examples from the project website with a cursory investigation.

Comment 2 spreadpando 2021-10-25 09:44:31 PDT

Live Examples
https://ideaspacevr.github.io/aframe-particle-system-component/

Comment 3 Kyle Piddington 2021-10-25 13:13:56 PDT

Dup of  https://bugs.webkit.org/show_bug.cgi?id=229378

If you need an immediate workaround...

The problem here is that the function name 'and' is conflicting with a metal symbol. We've fixed this in ToT Webkit.

To fix this, rename the 'and' function below to something else.

// float and(float a, float b) {
//     return a * b;

*** This bug has been marked as a duplicate of bug 229378 ***

Comment 4 Kyle Piddington 2021-10-25 13:14:38 PDT

Thank you for the report ! I really appreciate it.