Hi,

This isn't probably quite the right place to ask this, but here goes...

I've got a multithreaded emscripten/webgpu app that therefore requires the 
use of the JS sharedArrayBuffer class.

To enable this, I have learned I have to add the follow headers to my 
server responses:

Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp

I have done this and it works great, eg:

https://skirmish-dev.net/orkland/

This is running 2 background threads, one for the aerial image texture, one 
for the height map texture. They each first unzip and then mipmap the 
incoming data. It works fantastic and I'm still kind of amazed emscripten 
can do this!

BUT! If I try to place this inside an HTML iframe element, it doesn't work 
- I get the same 'class sharedArrayBuffer not found' error I would get if I 
left out the above headers.

I have tried adding the same headers to the page that contains the iframe 
but still nothing. I've tried a bunch of allow="" and sandbox="" settings 
and nada.

Is this even possible? I'm beginning to think it isn't. It's a question 
that's often asked, but the answer always seems to be 'it should work if 
you do blah blah!', never 'Yes, I've done that!'.

There is also the Cross-Origin-Resource-Policy header, but my understanding 
of that is it's intended for resources from a different origin? All my 
resources are from the same origin, and it doesn't seem to make a 
difference.

The page I've been able to make the most sense of regarding all this is 
here:
https://blog.stackblitz.com/posts/cross-browser-with-coop-coep/ 

Any corrections or more info would be most appreciated!

Bye.
Mark

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