Glad to know there is workaround.
I launch Quartz Debug and mark the radio button
"Disable Beam Synchronization". Now my application works well, the
refreshing problem has gone. Then I quit Quartz Debug and my application's
problem occurs again. I launch again Quartz Debug and strangely the radio
button "Disable Beam Synchronization" is not marked anymore.
How to set it permanently? And, most of all,
do I have to say to all of my clients to do this settings by themselves?
I hope no.
Best Regards
--
Lorenzo
email: email@hidden
> From: Shaun Wexler <email@hidden>
> Date: Mon, 16 May 2005 00:04:35 -0700
> To: Steve Christensen <email@hidden>
> Cc: Shawn Erickson <email@hidden>, Lorenzo <email@hidden>, Simon
> Clarke <email@hidden>, Cocoa-Dev <email@hidden>,
> Mac-OpenGL <email@hidden>, email@hidden
> Subject: Re: OpenGL and Tiger
>
> On May 15, 2005, at 8:39 PM, Steve Christensen wrote:
>
>> A posting to the Carbon list on Friday (5/13) mentioned a change to
>> the HIToolbox that can cause a slowdown (on purpose) if you try to
>> draw faster than the video card's frame rate. This may be related
>> to what you're seeing.
>
> This is the document they refer to (and please note the constant
> disclaimers for the performance-zapping "feature"):
>
> http://developer.apple.com/releasenotes/Carbon/HIToolbox.html
>
> If beam synchronization is disabled using Quartz Debug, everything
> works properly again. I confirmed this with MacFOH, and all windows
> maintain 75 fps regardless if they're occluded and being composited.
>
> According to the above doc, only apps linked against 10.4 will use
> the "automatic" beam sync. It is definitely a bug in CGS: all apps
> are being force-synchronized (regardless of executable link), and
> unfortunately this feature SUCKS to begin with. Anything forcibly
> imposed on developers further restricts our ability to provide high-
> performance without making constant workarounds for these
> "conveniences". If the API were nicely rolled into CG, NSScreen,
> etc, then it would be more useful. If this behavior was in fact only
> enabled by the link version of the executable, I'm in luck, because I
> can build just the executable with Panther, and everything else with
> Tiger if necessary, hopefully avoiding this sync issue.
>
> On a good note, using Quartz Debug to turn off beam synchronization
> globally actually makes Tiger seem fast, like Panther. I'm never
> turning it back on... ;)
> --
> Shaun Wexler
> MacFOH
> http://www.macfoh.com
>
>
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