Blend4web material shader error on iOS and iPadOS 15

[Eric]

Created attachment 439601 [details]
Console error of one of our pages we use this technology, device: iPad Pro 11" iOS 15.1

Issue with iOS and iPadOS 15.1 Safari and wkwebview Controller with webGL shaders, looks like it don't like any kind of material shader and don't render the 3d models.
We use this for a crucial part of our system for display 3d models.
In MacOS Safari, FireFox, Chrome last versions works perfectly.

Most of blend4web examples in they website don't work to.
https://www.blend4web.com/apps/code_snippets/code_snippets.html?scene=material_api


Console log attached.

Thanks.

[Kimmo Kinnunen]

Thanks. Most likely this is duplicate of bug  230472  as you observed.

[Eric]

I don't understand if this was resolved or i will have to look for an alternative. If it is resolved, how can I identify it? this is a serious problem for us.

Thanks!

[Kimmo Kinnunen]

(In reply to Eric from comment #2)
> I don't understand if this was resolved or i will have to look for an
> alternative. If it is resolved, how can I identify it? this is a serious
> problem for us.

Unfortunately the problem is present in the currently released iOS, but will be fixed in one of the upcoming releases.
If you are able to use a workaround, you could change the variables passed to inout parameters of the functions to not refer to swizzles.

before:
void f(inout float a) { ... }
void main() {
 vec3 myvec = ...;
 f(myvec.x);
}

after:
void f(inout float a) { ... }
void main() {
 vec3 myvec = ...;
 float myfloat = myvec.x;
 f(myfloat);
 myvec.x = myfloat;
}

[Eric]

Thank you very much now it's clearer.

[Radar WebKit Bug Importer]

<rdar://problem/83676218>

[Alexey Proskuryakov]

Is this understood well enough to dupe to bug 230472 at this point?

[Kimmo Kinnunen]

*** This bug has been marked as a duplicate of bug 230472 ***