acbuffer problem

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Glenn Waldron (gwaldron++at++banshee.camberva.com)
Mon, 25 Sep 1995 15:11:42 -0400 (EDT)

I use the accumulation buffer to do motion blurring. I set it up,
in the open-pipeline callback:

drawmode(NORMALDRAW);
acsize(12);
gconfig();
...

and I use it in the post-draw callback:

acbuf(AC_MULT, blur);
acbuf(AC_ACCUMULATE, 1.0);
acbuf(AC_RETURN, blur);
...

This always worked fine. In a 800x600 window, I got a consistent
30 hertz frame rate on a 1-RM 2-CPU Onyx (with limiting turned on).
Today, SGI came and installed a second RM4 board. Now I get a
consistant 8.6 hertz running the same program. Taking out the three
calls to acbuf() in the post-draw callback alleviates the problem.
What's happening?

Thanks, Glenn.

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