[Mesa-stable] [Mesa-dev] [PATCH 2/2] mesa: _mesa_format_convert should be endian agnostic

[Christian Zigotzky]

Hi Oded,

Is the r600g driver ready for the Gallium3D infrastructure of big endian 
hosts or did you only solve the wrong colors problem?

Cheers,

Christian

On 04 August 2015 at 6:57 PM, Oded Gabbay wrote:
>
>
> On Mon, Aug 3, 2015 at 6:40 PM, Emil Velikov <emil.l.velikov at gmail.com 
> <mailto:emil.l.velikov at gmail.com>> wrote:
>
>     Hi Oded,
>
>     On 2 August 2015 at 11:37, Oded Gabbay <oded.gabbay at gmail.com
>     <mailto:oded.gabbay at gmail.com>> wrote:
>     > This patch fixes a bug that is manifested in the read path of
>     mesa when
>     > running on big-endian machines. The effects can be seen when running
>     > piglit sanity test and/or taking a screen capture.
>     >
>     > The bug is caused when _mesa_format_convert receives src_format as
>     > mesa_format, which it thens changes to mesa_array_format. During
>     this
>     > change, it checks for endianness and swaps the bytes accordingly.
>     > However, because the bytes are _already_ swapped in the memory
>     itself
>     > (being written there by llvmpipe), and src_format value matches the
>     > _actual_ contents of the memory, the result of the read is wrong.
>     >
>     I'm assuming that you're looked at swrast + softpipe as well - do they
>     use the same approach or is llvmpipe the odd one out ?
>
> ​Hi Emil,
> ​
> ​I checked it with swrast, softpipe AND llvmpipe.
> Without my patch, all methods fail piglit sanity on ppc64
> With my patch, all ​methods pass piglit sanity
>
>    Oded
>
>     Curious if your work has any effect on the big endian + r600 issue
>     [1]. I believe Christian Zigotzky (Cc'ed) was very passionate about
>     getting his r600 working - perhaps he can give your patches a test ?
>     ... just to make sure that things don't go even worse :)
>
>
>     Cheers,
>     Emil
>
>     [1] https://bugs.freedesktop.org/show_bug.cgi?id=72877
>
>

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