BGR_U8 Encoding doesn't work on web in all browsers on linux

[jleibs]

pixi run rerun-web
pixi run -e py python tests/python/release_checklist/check_bgr.py 

Browsers: Firefox and Chrome both show a black tile:

Works fine on native.

OS: Arch, Wayland, Nvidia (560 drivers)

[jleibs]

Additional info from web console:

[Wumpf]

Turns out webgl doesn't support BGR(A)
https://registry.khronos.org/OpenGL-Refpages/es2.0/xhtml/glTexImage2D.xml

I wonder how this fell through the cracks. I definitely tested Web when introducing this feature and I'm fairly sure I had a look at WebGL and WebGPU (where this works via spec). Might want to check if some WebGL impls allow this or (more likely) I only tested WebGPU.

Also there's a wgpu bug here where it doesn't set the downlevel flag for missing texture support.

[Wumpf]

Somebody already logged this on wgpu :)

• webgl backend uses invalid glow::BGRA constant gfx-rs/wgpu#3583