In the cross platform game I support the mac code on, since a few
months ago people are reporting odd stutters while using the mouse. I
investigated and found that calling
for(;;)
{
UnsignedWide time;
Microseconds(&time);
NSEvent* event = [NSApp nextEventMatchingMask:NSAnyEventMask
untilDate:nil inMode:NSDefaultRunLoopMode dequeue:YES];
UnsignedWide time2;
Microseconds(&time2);
unsigned long msecs = (*(unsigned long long*)&time2)-(*(unsigned
long long*)&time);
printf("%ld, %d / ", msecs, nnn++);
if(!event)
{
printf("\n");
}
if(!event) break;
... process event
}
(note the debugging code isn't in the live game) takes (on my g5)
around 0.5ms for no event, but when there is a mouse moved event it
can take anywhere from 2 to 20 ms just for 1 call. Does anyone have
any idea why this would be? Oddly enough its not 100% of the time and
not for everyone but is fairly common. The result is that the frame
where this call is made sticks. The game is backwards (I didn't write
it) and each game loop calls the above code to obtain mouse and
keyboard events to control the avatar in the game. However this exact
code worked flawlessly for years until just a few months ago, which
makes 0 sense. The problem occurs in both slow macs and fast macs with
fps from 8 to 80.
Interesting enough if there are many events pending (like key repeats)
the first (usually the mouse event) takes a long time, then the
remaining don't take very long usually.
I tried both with and without mouse coalescing but it didn't help.
This is driving me nuts. If it wasn't such a pain in the butt I would
use a regular main event loop and run the game on a timer, but it
might still have this "slow" issue.
Any help is very appreciated!
- andrew
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