On Sun, 10 Aug 2003, Carsten Haitzler wrote:
> On Sun, 10 Aug 2003 05:59:54 +0100 Alan Hourihane <[EMAIL PROTECTED]>
> babbled:
>
> > On Sun, Aug 10, 2003 at 02:27:13PM +1000, Carsten Haitzler wrote:
> > > Would I be correct in the assumption that the only accelerated path for
> > > xrender is the identity transform (1:1 scale)? all other transforms are done
> > > in software? (my initial tests here with xfree86 4.3.0 & nvidia's latest
> > > drivers(as of about a month ago) seem to indicate as much...) (and yes... my
> > > drivers are using acceleration... GL definitely is). ?
> >
> > No. About 99% of the drivers don't have any xrender acceleration. I think
> > only the mga driver does. Although looking furthur the sis has some, but
> > it seems disabled, and the vmware driver has it too. But that's it.
> >
> > I guess nvidia do some acceleration in their binary drivers though, as
> > you've probably found. But it's bad to assume other drivers have xrender
> > acceleration.
> >
> > I think the thing that's holding other drivers up in getting furthur xrender
> > acceleration is that there's no test suite to check that the driver is
> > doing the right thing. I think Keith Packard mentioned he had intern's
> > working on a test suite a while ago, but nothing has materialized as far
> > as I know.
>
> hmmm - well i could write a performance suite here... if that helps. so far as
> in my other e-mail, the "hardware acceleration" provides by the nvidia drivers
> so far manages to be 1/35th the speed of my own mmx asm blending routines...
> this is blending with 1:1 scaling (no transform).
You're not hitting hardware paths. If you want to see this stuff
in hardware there's going to need to be a correctness test suite. I'm
already accelerating more than I can test. That worries me, and is
why render acceleration is off by default in recent NVIDIA drivers.
>
> i just tested a quick scaling test and the software routines i have are 41 times
> faster than xrender... there is something suspicious here...
>
> a quick rundown:
> my software routines are in imlib2.
> machine is amd 1.7ghz
> gfx is nvidia gf4 4400ti 128mb
>
> NVAGP is set to 0 cause it manages to lock up my kernel regularly :(
>
> this is xfree 4.3.0
> nvidia drivers:
>
> NVIDIA_kernel-1.0-4191
> NVIDIA_GLX-1.0-4191
I thought you said you were using recent drivers. There's been
two releases since then. There are known render bugs in 4191.
>
> well there goes my plans for
> a project to do an xrender display engine... opengl still is the big winner :)
>
OpenGL reflects what the hardware can do, and has a compliance test
suite. RENDER doesn't reflect hardware capabilities very well (it
reflects what end users wanted to see in an API) and there's no
compliance tests. Stick with OpenGL.
Mark.
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