Harri Kaimio (harri.kaimio++at++yle.fi)
Thu, 09 Apr 1998 18:36:49 +0300
This is not Performer specific, but I wonder if anyone has used a
JPEG-compressed movie file as a texture map with the old compression
library. This seems to be easy using dmbuffers, but my application must
run on 6.2 and they were not available until 6.3 (I think)
What I have done: I have a separate thread in which I read the JPEG data
and decompress it using Impact Compression card. I then load the
uncompressed frames to texture map in draw callback (using
pfTexture::subload). This works, but it CL uses the old IRIS GL pixel
format XBGR (although it calls it RGBX!)
I tried to call
_texture->setFormat( PFTEX_INTERNAL_FORMAT, GL_ABGR_EXT );
when I defined the texture, but I got only a blank texture. Is this the
right way to set the texel format, or should I do something else? Also,
is there a fill rate penalty when using GL_ABGR_EXT texel format
compared to RGBX? I am already fill rate limited so this would be bad.
I would appreciate any ideas. What I really need is to display an
512x512 animated texture map (RGB, 8 bit per component) on High Impact.
The animation has about 100 frames and must run 25 fps, so I guess that
storing it uncompressed on disk or in memory is not possible.
-- ----------------------------------------------------------------- Harri Kaimio | harri.kaimio++at++yle.fi Computer Graphics Specialist | http://cartes.hut.fi/~hkaimio Finnish Broadcasting Company | Tel. +358-40-50 67 679 TV Production Operations | Fax. +358-0-1480 4769
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