From: Dorosky, Christopher G (christopher.g.dorosky++at++lmco.com)
Date: 10/29/2003 14:26:50
You have to subload them on each pipe.
No way around it, unless you want to take the frame hit and have
Performer call the tex->load() implicitly.
Pipe 0 CANNOT share it's texture memory with Pipe 1.
Channel 0 CAN (and does) share it's texture memory with channel 1, IF
Channel 0&1 are on the same pipe.
That saying was misleading. pfTexture's can have different images in
different pipes. Both must be directly subloaded, even if they are the
same.
Think of the texture beign texture for a tank. One pipe could be visual,
the other IR. Possibly the same pfTexture, but different image data.
Chris
-----Original Message-----
From: owner-info-performer++at++performer.engr.sgi.com
[mailto:owner-info-performer++at++performer.engr.sgi.com]On Behalf Of
Volodymyr Kindratenko
Sent: Wednesday, October 29, 2003 10:20 AM
To: 'Dick Rous'
Cc: info-performer++at++sgi.com
Subject: RE: [info-performer] Subload pfTexture across multiple pipes
Dick:
Actually, it does not, and why should it be? Ideally I want the texture
image to be rendered only once on a separate pipe and then be
distributed to
the remaining pipes (4-IR SGI connected to a 3-wall CAVE). At the
moment,
the texture rendering channel is attached to one of the 3 pipes used to
render the CAVE imagery. And sure enough, this pipe has the right
texture.
How can I grab this texture and distribute it to the remaining channels?
Chapter 9. Graphics State from the OpenGL Performer Programmer's Guide
says:
"... pfSubloadTex() and pfSubloadTexLevel() can also be used in the
drawing
process to do an immediate load of texture memory managed by the given
pfTexture and these routines allow you to specify all loading parameters
(source, origin, size, etc.). THIS IS USEFUL FOR LOADING DIFFERENT
IMAGES
FOR THE SAME pfTexture IN DIFFERENT GRAPHICS PIPELINES. ..." And I need
just the opposite, loading the same image in different graphics
pipelines.
Volodymyr
> -----Original Message-----
> From: Dick Rous [mailto:dick++at++sgi.com]
> Sent: Wednesday, October 29, 2003 4:48 AM
> To: 'Volodymyr Kindratenko'; info-performer++at++sgi.com
> Subject: RE: [info-performer] Subload pfTexture across multiple pipes
>
>
> Have you checked if the subload code in the draw callback is
> executed for each pipe?
>
> - Dick.
>
> > -----Original Message-----
> > From: Volodymyr Kindratenko [mailto:kindr++at++ncsa.uiuc.edu]
> > Sent: Wednesday, 29 October, 2003 01:08
> > To: info-performer++at++sgi.com
> > Subject: [info-performer] Subload pfTexture across multiple pipes
> >
> >
> >
> > Hello:
> >
> > I need to build a rear view mirror for a driver
> > simulator. To do
> > this, I define a separate channel for rendering rear view
> > mirror image and
> > in that channel's draw callback I subload the relevant
> > portion of the frame
> > buffer to the appropriate pfTexture. This works just fine on
> > a single pipe
> > system. How can I share this texture across multiple pipes
> > (CAVE)? In the
> > CAVE I see that the correct image is applied to a portion of
> > the mirror
> > polygon residing on the front wall (I use the front wall's
> > pipe rendering
> > the rear view channel), and nothing is applied to the portion
> > of the polygon
> > residing for example on the left wall. Basically, the
> > texture image is not
> > shared between the pipes. Please help!
> >
> > Volodymyr Kindratenko
> > NCSA, UIUC
> >
> >
> > --------------------------------------------------------------
> > ---------
> > List Archives, Info, FAQ: http://www.sgi.com/software/performer/
> > Open Development Project: http://oss.sgi.com/projects/performer/
> > Submissions: info-performer++at++sgi.com
> > Admin. requests: info-performer-request++at++sgi.com
> > --------------------------------------------------------------
> > ---------
> >
>
-----------------------------------------------------------------------
List Archives, Info, FAQ: http://www.sgi.com/software/performer/
Open Development Project: http://oss.sgi.com/projects/performer/
Submissions: info-performer++at++sgi.com
Admin. requests: info-performer-request++at++sgi.com
-----------------------------------------------------------------------
This archive was generated by hypermail 2b29 : Wed Oct 29 2003 - 14:40:34 PST