From: MLM Veraart (veraart++at++fel.tno.nl)
Date: 03/05/2002 09:51:32
Seppo Äyräväinen wrote:
>
> Hi,
>
> I need to display a stereo view of scene B, mapped as a texture into a
> simple rectangular geometry in scene A. For that, I've created two (one
> per eye) extra channels per pipe to render the scene B image into the
> backbuffers. In short, I do this (on one pipe/window case for
> simplicity):
>
> 1. Clear extra left channel
> 2. Draw extra left channel
> 3. Subload the texture from framebuffer
> 4. Clear normal left channel
> 5. Draw normal left channel (with loaded texture applied)
> 6. Clear extra right channel
> 7. Draw extra right channel
> 8. Subload the texture from framebuffer (here it goes wrong)
> 9. Clear normal right channel
> 10. Draw normal right channel (with loaded texture applied)
> 11. Swap buffers
>
> Now the left eye's texture is correctly loaded, but the right eye's
> texture comes from the left backbuffer, instead of the right one.
>
> How can I tell Performer to read the texture from the right eye's
> backbuffer, or should setting glDrawBuffer(GL_BACK_RIGHT) do the trick
> (which it doesn't seem to)?
>
> Or am I totally lost here and this approach will never work in stereo?
>
> I'm running this on an Onyx2/Performer 2.4/VR Juggler 1.0.5, and have
> made new application and draw manager classes (based on vjPf...) to
> Juggler to handle the extra channels and draw callbacks.
>
> I first tried to use pbuffers, but never got them to work (in either O2
> or Onyx2/IR) - except in the demo that rendered something into a file
> offscreen (got nothing but BadMatch's discussed here earlier) :(
>
> Thanks in advance for any help,
> Seppo Äyräväinen
Take a look at
man glReadBuffer
It does what you want.
Mario
This archive was generated by hypermail 2b29 : Tue Mar 05 2002 - 09:52:04 PST