Add accelerated OpenGL support

[jacereda]

AFAIK accelerated OpenGL requires building Mesa with d3d12 support in Gallium:

https://bugs.archlinux.org/task/70703

Could this be added to AlmaLinux?

[amithgeorge]

Not really sure why this might be needed. However, if enabling it is straightforward, I will consider a PR for it.

[jacereda]

It should be a matter of adding d3d12 in the mesa build flags like:

https://github.com/archlinux/svntogit-packages/blob/6a5b00eef15fe288fe5a3e3f5a0cbf8270678499/trunk/PKGBUILD#L45

And probably packaging https://github.com/microsoft/DirectX-Headers as well.

I'm new to AlmaLinux, so I'm afraid I can't contribute a PR at this point.

[jacereda]

As to why is it needed, if this isn't enabled all OpenGL will probably use software rendering and things using CUDA will probably fail.

You can confirm as:

[jacereda@I9:~]$ glxinfo|grep "renderer string"
OpenGL renderer string: llvmpipe (LLVM 13.0.1, 256 bits)