webgpu support

[herkhinah]

Firefox nightly supposedly has webgpu support but I can't get it running. Firefox complains Validation error without device target: No suitable adapter found. In about:config WebGPU is enabled and the blocklist is disabled and about:support says it can also find my integrated graphics card. Do I have to configure some environment variables so firefox can find some missing libraries?

[colemickens]

we have historically had issues with firefox-bin variants and hardware acceleration, but it is working for me:

It doesn't seem like I have anything webgl overriden in my about:config either.

[MatthewCroughan]

Setting LD_LIBRARY_PATH=/run/opengl-driver/lib on NixOS fixed this for me.

[colemickens]

I will try to keep this tab open to look at it, but I'm getting swamped from multiple angles in my life right now and don't know when I'll really be able to give this attention.

For what it's worth, I am glad to be aware of this. I'm surprised that Firefox Nightly works as well as it does, seemingly without the same type of wrapper present in nixpkgs wrapped-firefox builds. I was sure that we have had to fix this same opengl/libglvnd wrap issue for this build in the past.

There's a Nix Mozilla Matrix room too, might be worth bringing this up there if someone else wants to investigate more.

[colemickens]

This works for me, by just running firefox-nightly: https://toji.github.io/webgpu-test/

When I look at firefox-nightly, it's a shell script that pulls libglvnd in LD_LIBRARY_PATH which should enable gpu driver loading via /run/opengl-driver.

[MatthewCroughan]

@colemickens yeah, for what it's worth I didn't notice any slowdowns, but also never performed any tests prior to wrapping with LD_LIBRARY_PATH. However, it did make the log lines go away. But maybe the log lines don't mean much in the first place. Who knows!