[Mesa-dev] Mesa 7.11 and osmesa

[Paul Gotzel]

Brain,

I'm using osmesa with VTK and in this particular test I'm rendering
just lines.  The ratios stay the same for just triangles.  Just for
these simple primitives 7.11 seems to be about 4 times slower that
7.6.1.

Can you give me some pointers on where to get started with a new
gallium based osmesa interface? I'd certainly like to make a stab at
developing this capability.  This is something that would be quite
valuable for my purposes as well.

Regards,
Paul

On Thu, Oct 6, 2011 at 10:27 AM, Brian Paul <brianp at vmware.com> wrote:
> On 10/04/2011 01:22 PM, Paul Gotzel wrote:
>>
>> Hello,
>>
>> I've recently upgraded to mesa 7.11 and I've noticed significant
>> performance degradation when using osmesa.  Here's my results when
>> comparing the versions:
>>
>> Version       Time
>> 7.6.1            4s
>> 7.10.3          16s
>> 7.11             23s
>>
>> This is the time to render a single frame (including the initial
>> program overhead).   Any thoughts?
>
>
> I don't have time to investigate this in any depth.  One thing that comes to
> mind is the software texturing code.  Most of the ubyte-based texture
> sampling code was replaced by floating point so if you're doing a lot of
> texture mapping, that could be a reason.
>
> To learn more, someone would have to do a bisection.
>
> What kind of rendering featurs are you using (plain shaded tris, texturing,
> shaders, etc)?
>
>
>> I'm not using the gallium
>> framework.  Would enabling gallium help in some way?
>
> LLVMpipe would almost certainly be a lot faster.  I've been meaning to write
> a new OSMesa interface for gallium but haven't found the time. That would be
> a valuable project for at least a few people.
>
> -Brian
>
>