Re: Dynamic Texture

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Angus Dorbie (dorbie++at++sgi.com)
Mon, 11 Oct 1999 11:49:41 -0700

You can avoid readback on O2 and the 320 & 540 thanks to the UMA design.

You use readback on the other systems.

The call for readback is glCopyTexSubImage2DEXT or glCopyTexSubImage2D,
it's either OpenGL 1.1 or it will be 1.0 extension EXT_copy_texture.

Cheers,Angus.

Devrim Erdem wrote:
>
> Angus Dorbie wrote:
>
> > Do you mean for readback or are you trying to avoid readback? The latter
> > is implemented more like rendering to texture IMHO because you don't
> > actually have the image in the framebuffer.
>
> For readback. But I wasn't aware of directly rendering to texture possibility.
> How can I directly render to texture if so ? What is the advantage ? Speed ?
> pfSubloadTex looks fast but I haven't tested it in a realtime app yet.
>
> >
> >
> > Cheers,Angus.
> >
> > Devrim Erdem wrote:
> > >
> > > Hi,
> > >
> > > How can I query the capability to use Framebuffer as a texture source
> > > ?
> > >
> > > --
> > > /*===============================================
> > > M. Devrim Erdem devrim++at++infotron-tr.com
> > > Senior Engineer
> > > Simulation Software Development
> > > info(+)TRON, Turkey
> > > Tel:+90 216 4921002
> > > Fax:+90 216 3432132
> > > http://www.infotron-tr.com
> > > http://abone.turk.net/mderdem
> > > ===============================================*/
> > >
> > >
> >
> > --
> > "One of the best-known folk theorems of software engineering is that
> > 60% to 75% of conventional software projects are either never
> > completed or rejected by their intended users. If that range is
> > anywhere near true (and I've never met a manager of any experience
> > who disputes it) then more projects than not are being aimed at goals
> > which are either (a) not realistically attainable, or (b) just plain
> > wrong."
> > Eric S. Raymond - The Cathedral and The Bazaar
> >
> > For advanced 3D graphics Performer + OpenGL based examples and tutors:
> > http://www.dorbie.com/
>
> --
> /*===============================================
> M. Devrim Erdem devrim++at++infotron-tr.com
> Senior Engineer
> Simulation Software Development
> info(+)TRON, Turkey
> Tel:+90 216 4921002
> Fax:+90 216 3432132
> http://www.infotron-tr.com
> http://abone.turk.net/mderdem
> ===============================================*/

-- 
"One of the best-known folk theorems of software engineering is that
60% to 75% of conventional software projects are either never
completed or rejected by their intended users. If that range is
anywhere near true (and I've never met a manager of any experience
who disputes it) then more projects than not are being aimed at goals
which are either (a) not realistically attainable, or (b) just plain
wrong."
                 Eric S. Raymond - The Cathedral and The Bazaar


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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