[...]
> BTW - does anyone know why the mga driver internally converts to 422
> format ? It seems to me that mga 400 and 450 chips do support 420
> planar format... (I saw some sample code using it, I can probably find
> it back if needed). I think XFree would benefit from using this
> feature ins
> At 11:26 AM 4/01/02 +0100, Ewald Snel wrote:
(sorry for the duplicate message, it was delayed for one week (see date))
[...]
> It would be interesting to see if the same could be achieved with 3DNow!
> instructions, as this would provide a welcome boost for anyone with an AMD
> K6-2 or K6-3 o
At 11:26 AM 4/01/02 +0100, Ewald Snel wrote:
>Hi,
>
>Could I use MMX assembly for improving the mga video driver? I wrote a
>vertical chrominance filter (*) for the XVideo module using inline MMX
>assembly. This allows me to improve output quality without any speed penalty.
It would be interestin
On Fri, Jan 04, 2002 at 11:26:02AM +0100, Ewald Snel wrote:
> Could I use MMX assembly for improving the mga video driver? I wrote a
> vertical chrominance filter (*) for the XVideo module using inline MMX
> assembly. This allows me to improve output quality without any speed penalty.
BTW - doe
To reply to my own mail :)
Billy Biggs ([EMAIL PROTECTED]):
> > It's actually 0.5 pixel (my mistake :)) using the following filter :
> >
> > o o (c=c1)
> > c1
> > o o (c=.5*c1 + .5*c2)
> >
> > o o (c=c2)
> > c2
> > o o (c=.5*c2 + .5*c3)
>
> I don't think this is right f
Ewald Snel ([EMAIL PROTECTED]):
> > Please, please correct me if I'm wrong here. In MPEG sampling, the
> > chrominance sample is halfway between the two luminance samples on
> > the same vertical scanline (by is138182):
>
> I think you're right, my interpolation looks like this :
>
> o o (
Hi,
[...]
> > Something like that, the filter uses 0.75x nearest chrominance sample
> > and 0.25x second nearest chrominance sample. This is more accurate as
> > it doesn't shift the chrominance signal by 1 pixel.
>
> Please, please correct me if I'm wrong here. In MPEG sampling, the
> chromi
On Fri, 4 Jan 2002, Billy Biggs wrote:
> Please, please correct me if I'm wrong here. In MPEG sampling, the
> chrominance sample is halfway between the two luminance samples on the
> same vertical scanline (by is138182):
>
>o o where o == luma sample
>x x == c
Ewald Snel ([EMAIL PROTECTED]):
> > > I wrote a vertical chrominance filter (*) for the XVideo module
> > > using inline MMX assembly. This allows me to improve output
> > > quality without any speed penalty.
> >
> > Do you mean for upsampling to 4:2:2 ? How do you filter? Do you
> > average to
Hi,
> > I wrote a vertical chrominance filter (*) for the XVideo module using
> > inline MMX assembly. This allows me to improve output quality without
> > any speed penalty.
>
> Do you mean for upsampling to 4:2:2 ? How do you filter? Do you
> average to create the new chroma line?
Somethin
> > I've also been playing with some mmx-ification of the XVideo
> > routines, for example I also did an SSE-4:2:0-to-4:2:2 function.
>
> I just did this too, MMX only though. How many cycles/pixel did you
> end up with? What percentage of pairing did you achieve?
I'll get some numbers in a se
On Fri, 4 Jan 2002, greg wright wrote:
> I just did this too, MMX only though. How many cycles/pixel did you
> end up with? What percentage of pairing did you achieve?
Note that only P5-core chips care about pairing, per-se. There are much
nastier issues involved in modern P6 cores. I haven't t
> I've also been playing with some mmx-ification of the XVideo routines,
> for example I also did an SSE-4:2:0-to-4:2:2 function.
I just did this too, MMX only though. How many cycles/pixel did you
end up with? What percentage of pairing did you achieve?
> There was some discussion on #xfree
Ewald Snel ([EMAIL PROTECTED]):
> Of course, I'm using "#ifdef USE_MMX_ASM" and the original C code as
> an alternative for other CPU architectures. Runtime detection of MMX
> support is not included yet, but will be added if MMX is allowed.
I've also been playing with some mmx-ification of th
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