[Xorg-driver-geode] OpenGL performance on Geode

[Dhimant Bhayani]

Hi Mart,

I was wondering if the OpenGL performance can be improved by:

(1) Using Single Precision FP instructions    AND
(2) Using 3DNOW instructions 

Main idea here is to improve the performance enough for UI
and smaller Flash video renderings. 

Thank you.

Dhimant

> Thx.
> 
> Dhimant Bhayani
> 
> 
> -----Original Message-----
> From: Mart Raudsepp [mailto:mart.raudsepp at artecdesign.ee] 
> Sent: Monday, March 02, 2009 12:02 AM
> To: Dhimant Bhayani
> Cc: 'alpha_one_x86'; xorg-driver-geode at lists.x.org
> Subject: RE: [Xorg-driver-geode] Support dri2?
> 
> On P, 2009-03-01 at 17:01 -0800, Dhimant Bhayani wrote:
> > DRI, DRM or DRI2 would be useful for OPEN GL (GLX).
> > More and more software is using Open GL and performance
> > of LX is graphics is not very good due to lack of support
> > for the above mentioned modules.
> 
> OpenGL performance is not very good because
> 
> a) Geode LX has no hardware GL support _at all_
> b) software OpenGL via mesa software driver is slow because it currently
> uses double precision floating point instructions extensively, for which
> GeodeLX needs to do multiple passes through the pipeline with CPU
> microcode, as it can do directly only single precision floating point
> instructions in one pipeline cycle.
> 
> 
> Regards,
> Mart Raudsepp
>