Re: Mesa 12.0.0 on Windows question

LLVM will use the CPU instructions which are supported at runtime 
(SSE2/SSE3/etc).

-Brian

On 09/17/2016 05:07 AM, Rick Irons wrote:
> Thanks.
> Does the renderer have runtime CPU detection or is the specific CPU
> support determined at compile time?   I would like to understand the
> portability of Mesa to Windows configurations different than the one on
> which it was built.
> Any links to such info would be appreciated.
> Rick
>
> _____________________________
> From: Albert Freeman <[email protected]
> <mailto:[email protected]>>
> Sent: Saturday, September 17, 2016 1:02 AM
> Subject: Re: [Mesa-users] Mesa 12.0.0 on Windows question
> To: Rick Irons <[email protected] <mailto:[email protected]>>
> Cc: <[email protected]
> <mailto:[email protected]>>
>
>
> yes llvm support its required to build llvmpipe which like softpipe
> only uses the cpu for rendering however has greater performance
>
> On 17 September 2016 at 07:45, Rick Irons <[email protected]
> <mailto:[email protected]>> wrote:
>  > Hi,
>  >
>  >
>  >
>  > I have built Mesa 12.0.0 on a Windows 10 machine and I would like to
> better
>  > understand the rendering support that is being provided. The version,
>  > vendor, and renderer are being identified as the following by
> opengl32.dll…
>  >
>  >
>  >
>  > Version: 3.0 Mesa 12.0.0
>  >
>  > Vendor: VMware, Inc.
>  >
>  > Renderer: Gallium 0.4 on softpipe
>  >
>  >
>  >
>  > What exactly does the ‘softpipe’ portion of the renderer info mean?
> Does it
>  > mean that the OpenGL implementation is purely software based with no
>  > reliance on either GPU or CPU? I suspect this to be the case since
> display
>  > performance is poor with scenes of simple complexity.
>  >
>  >
>  >
>  > When building the DLL I noticed a warning that LLVM was not available and
>  > would not be used. I am speculating that if I installed LLVM the makefile
>  > configuration tool would detect it and perhaps build a ‘Gallium 0.4 on
>  > llvmpipe’ renderer. Is this the case? Would this renderer leverage either
>  > the CPU or any available GPU? Additionally, if no supported CPU or GPU
>  > hardware was detected, would the renderer know to revert to a purely
>  > software based implementation?
>  >
>  >
>  >
>  > Thanks for any clarifications.
>  >
>  >
>  >
>  > Rick
>  >
>  >
>  >
>  >
>  >
>  >
>  >
>  >
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