On May 8, 2008, at 8:44 AM, Dario Accornero wrote:
Hello,
In my AGL windowed application I am enabling the kCGLCEMPEngine
flag when running on machines with more than one CPU. This
effectively improves performance, but... (live-)resizing the window
results in a few visual glitches. It looks as though VRAM is being
paged or shuffled around for some milliseconds: I can't manage to
obtain a screenshot with the garbled output, but overall the
impression is that the paging is not in sync with the context
resizing (which calls aglUpdateContext as per the docs).
The MP Engine doesn't change how VRAM pages are managed but it does
buffer instructions differently (more to the point it simply does
more instruction buffering) than the serial engine.
Try flushing the context glFlush/glFinish in your reshape/resize
method. This will empty the additional instruction buffer the MP
Engine maintains.
If this doesn't work, please file a bug.
If you're using multiple or shared contexts, this is an important
detail.
If I turn off the kCGLCEMPEngine flag, (live-)resizing is always
smooth, no matter how large the window is or what it displays.
Any ideas about this? I'm in 10.5.2 on a MacBook Pro 2.4GHz w/
8600M GT 256MB.
Thank you,
Dario
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