From: Bernie Kirby (bernie++at++ecr.mu.oz.au)
Date: 07/15/2004 15:48:21
Compositor confusion.
Does anyone have a performer3.1.1 app that uses
multiple compositors?
We have an onyx4 with 3 compositors, but as yet, we've not been
able to effectively get a single performer app to 'drive' the
multiple compositors.
One setup is this:
2 cards each driving the 3 compositors with a 2x1 vert subdivision.
that is, 6 cards in total - 6 screens.
Using the example compositor.C code, and modifying it to use just the
first two pipes with the 2x1 vert subdivision, it works fine.
Extending this we tried creating 3 pfCompositors and added the pipes 0,1
to the first one, 2,3 to the second and 4,5 to the third.... added channels as
needed, called setScreen as appropriate. Doesn't work. Only the first compositor
composits, and the others seem to just use the first pipe specified (maybe the
others - can't see them) and aren't being composited.
This leads to questions:
How do you tell a pfCompositor which actual compositor to use?
What are the 'rules' for addressing each compositor?
If I wanted to (for example) just run a graphics program on
(say) the third compositor using just it's two cards, how can I
stop performer opening a window on all the 'other' essentially unused pipes?
Also, returning to the basic compositor.C example, we tried to just use
2 pipes again, but called setScreen to point to some of the other screens
on another compositor. Again, didn't work.
Other questions:
What is a software compositor? (see example perfly C code
pfCompositorMode(compositor, PFCOMP_SOFTWARE, 1); )
What are the PFCOMP_TYPEs PFCOMP_NxM_VERT and PFCOMP_NxM_HORIZ ? again,
used in perfly code, but not in man page.
What does pfCompositorAddCompositor do? It's mentioned in the
man page, but there's no description.
Other problems:
Calling:
pfCompositorMode(comp, PFLOAD_BALANCE, PF_OFF /* or PF_ON */);
Gives this message:
PF Warning: pfCompositor::setMode(), compState is NULL
and subsequently, a core dump.
-- Two wrongs don't make a right ... but two wrights make an aeroplane.
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