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Window resizing with kCGLCEMPEngine

Subject: Window resizing with kCGLCEMPEngine
From: Dario Accornero <email@hidden>
Date: Thu, 8 May 2008 17:44:05 +0200
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Delivered-to: email@hidden

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).

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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