[cairo] Re: [Mesa3d-dev] Points in Cairo Glitz paper

Jon Smirl jonsmirl at yahoo.com
Mon Apr 26 09:23:13 PDT 2004

Be sure and think about the remote networked case when writing convolution
filters. You probably don't want glitz to suck the buffer from the server back
to client, convolute it, and then send it back to the server. It might be better
to spend the effort on fixing the mesa/OpenGL implementation and then send the
code to ATI/Nvidia.

--- Ian Romanick <idr at us.ibm.com> wrote:
> Vladimir Vukicevic wrote:
> > David Reveman wrote:
> >> On Sun, 2004-04-25 at 11:01 -0600, Marcelo E. Magallon wrote:
> >>
> >>> I didn't take a closer look at the convolution operation and I'm not
> >>> sure if the imaging extensions are capable of providing equal
> >>> functionality.
> >>
> >> I've actually tried using the imaging extensions for convolution
> >> filtering but it turned out terribly slow. 
> > 
> > Some time ago, a friend was doing some work with the imaging extensions. 
> >  It turned out that neither nVidia nor ATI make any real attempts to 
> > optimize/accelerate them -- the majority of operations are terribly slow 
> > under both linux and win32.  It's probably not worth depending on 
> > ARB_imaging for much of anything, though I'm not sure if representing 
> > operations using ARB_imaging would help Mesa accelerate those operations 
> > (hand tailored assembly, etc.).
> On most "consumer" hardware the majority of operations in ARB_imaging 
> are software fallbacks.  There are a number of things that, with some 
> effort, could be partially accelerated with hardware, however.  Most 
> people working on drivers (open-source or closed-source) haven't done 
> this because it's a fair amount of effort and the market hasn't demanded it.
> The market drives everything.
> If there were important applications that needed fast imaging to be 
> fast, and Nvidia or ATI thought bumping performance in those application 
> would sell more chips, you had better believe imaging performance would 
> improve. :)
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Jon Smirl
jonsmirl at yahoo.com

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