Bug#943865: src:mesa: Please build Mesa SWR rasterizer on amd64 and i386

[Timo Aaltonen <tjaalton@debian.org>]

On 31.10.2019 1.35, Witold Baryluk wrote:
> Package: src:mesa
> Severity: normal
> 
> Dear Maintainer,
> 
> SWR is a new high performance rasterizer that is usually significantly
> faster than softpipe or llvmpipe and is merged in upstream Mesa for
> some time.
> 
> Adding these meson extra flags:
> 
> "-Dgallium-drivers=....,swrast,swr" "-Dswr-arches=avx,avx2,knl,skx"
> 
> should build and install these files in lib/{x86_64,i386}-linux-gnu/
> 
> libswrAVX2.so
> libswrAVX2.so.0
> libswrAVX2.so.0.0.0
> libswrAVX.so
> libswrAVX.so.0
> libswrAVX.so.0.0.0
> libswrKNL.so
> libswrKNL.so.0
> libswrKNL.so.0.0.0
> libswrSKX.so
> libswrSKX.so.0
> libswrSKX.so.0.0.0
> 
> dri/kms_swrast_dri.so    (maybe)
> dri/swrast_dri.so
> 
> It is probably worth packaging into separate package (with all arches
> tho, no need to split it into 4 packages, mesa gallium loaader will
> automatically determine best suitable version and load it dynamically).
> 
> Building on other archs might succeed (unlikely), but it is pointless as
> SWR targets at the moment only x86 specific vector instructions so even if
> it manages to be able to generate code at runtime (via LLVM) it will not be
> able to run it anyway. Thus the request is only for i386 and amd64.
> 
> Adding x32 and kfreebsd-{amd64,i386} at your discretion.
> 
> Best regards,
> Witold.

I'm thinking this should replace llvmpipe on x86 if enabled, there's no
point in keeping both especially since llvmpipe would still be the default.



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