RE: An OpenGL Question

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From: Joseph R. Spann (Joseph.Spann++at++baesystems.com)
Date: 10/11/2000 11:39:52

Cool! So clip texturing is a software problem after all.
So now that a year has gone by I'll ask again:
How about software cliptexture support for Performer running on
systems other than an Onyx? Especially linux!
"I saw the Intrinsic Graphics people do 60Hz clipmapping on a PC..."
I'd expect you could do as good as that.
This is really critical for desktop to supercomputer product support.
Cliptextures reduce the hardware burden so significantly it belongs on a PC.

Pretty please:-)

> -----Original Message-----
> From: dorbie++at++sgi.com [mailto:dorbie++at++sgi.com]
> Sent: Sunday, October 08, 2000 8:16 PM
> To: Hui Li
> Cc: info-performer++at++sgi.com
> Subject: Re: An OpenGL Question
>
>
> The progressive loading in OpenGL 1.1 is just glTexSubImage2D
>
> To do something like clip texturing, or even to exploit clip texture
> capability where you have it requires quite complex and sophisticated
> software to manage a texture database from disk to system memory and on
> to graphics hardware. Even the requisite tweaks to graphics hardware
> only make this a more elegant scheme, you still need good software. If
> you want to do this in OpenGL yourself you'll have to create a database
> of the right structure, load files from that database to memory based on
> the paging requirement and download that to texture memory in a tightly
> controlled way if you want anything close to good performance.
>
> CHeers,Angus.
>
> > Hui Li wrote:
> >
> > This is acurally an openGL question
> >
> > My application on PC using Opengl need serf large terrian with
> > huge amount of texture, Cliptexture on Performer could do it
> >
> > but with openGL what should i do, i heard that with OpenGL1.1 or
> > higher, it support progressive texture loading, can any body give
> > me more clue?
> >
> > Hui
>
> --
> For Performer+OpenGL tutorials http://www.dorbie.com/
>
> "In the middle of difficulty lies opportunity."
> --Albert Einstein
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