On May 17, 2006, at 8:24 PM, James W. Walker wrote:
I'm not sure if this is the right mailing list for this question,
but I know I'd get yelled at if I cross-posted...
My application often renders incorrectly when coalesced updates are
on. Tech Note 2133 tells some cases in which one coalesced updates
might impact performance, but does not explain why you'd see the
wrong stuff on the screen.
This is a Carbon application with a composited window. Certain
HIViews in the window are set up to draw with OpenGL. On
kEventControlDraw, the view renders, ending with aglSwapBuffers and
glFinish. What sometimes happens (maybe half the time) is that
there is a flash and the OpenGL content disappears, revealing
whatever was underneath it in the window. Turning off coalesced
updates with Quartz Debug makes this problem go away.
Any idea what I could do, other than turning off coalesced updates
in my app?
I don't know offhand what's happening here (we don't have much
experience combining OpenGL and composited HIViews in-house; we need
to investigate this further and see if we should be adding more
explicit support to the HIView Manager for OpenGL), but I'm curious
what happens if you use QuartzDebug to turn on "auto-flush drawing".
Does that make a difference?
-eric
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