LunarG Samples didn't work with gl backend

[caiiiycuk]

Hi, very cool project! I followed build instructions and build LunarG Smaples with gfx-portability loader.
If i use gfx-backend-vulkan then samples work fine, but for gfx-backend-gl most samples didn't work with this error:

depth_format 124 Unsupported.

Do you think it can be fixed someway?

[kvark]

gfx-portability's GL backend is there in theory but we didn't reach a stage where it could run anything meaningful. At this point, we aren't going to be fixing gfx-backend-gl. Instead, #250 is the way to go.