Re: Indigo2 Impact video

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Mon, 23 Dec 1996 13:14:44 +0000

On Dec 20, 6:13pm, Frederic Quinet wrote:
> Subject: Indigo2 Impact video
>
> Still using an Impact video board on indigo2 R10000 impact with
> Performer 2.0 Irix 6.2. and Iris GL.
> As no one gave me answers to:
>
> > -Is Performer 2.0 able to load video texture on my machine on Irix 6.2
> > -If i have to do callbacks, do i have to use gl or pf functions ?
> > -Do i have to worry about an offset (with Performer) to respect the
> TRAM
> >restrictions...?
>
> I kept on trying to run lv.c ( code,in the ML archive of june 1996,
> wich
> is based on a movietex.c ). This code is supposed to load a frame using
> call backs and three functions:
> -glXCreateXGLXVideoSourceSGIX
> -glXMakeCurrentReadSGI
> -pfLoadTex
>
> To get at least one frame, i just had to fix gltexformat to
> PFTEX_RGBA_8 . Doing this it appeared that the frame came from the buffer
> used by vidtotex.c . This would mean that pfLoadTex doesn't work and that
there
> is no equivalent in Performer of the function : glCopyTexSubImage2DEXT wich
is
> used to load frames in the TRAM.

You should be able to use the gl.

The API also supports specifying a video source although I wouldn't
be surprised if this isn't functional in 2.0.1 on IMPACT.

pfTexLoadMode (tex, PFTEX_LOAD_SOURCE, PFTEX_SOURCE_VIDEO);

> Does it mean there is no way to use Performer for video live texturing
> on Indigo2 Impact with an Impact video board ?
> Would Performer 2.2 make any change?
>
> Thanks in advance.
> Fred. quinet++at++imtsg12.epfl.ch
>
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>-- End of excerpt from Frederic Quinet

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