Re: Synchronizing iOS redraw
Re: Synchronizing iOS redraw
- Subject: Re: Synchronizing iOS redraw
- From: Rick Mann <email@hidden>
- Date: Sun, 7 Nov 2010 22:39:32 -0800
On Nov 7, 2010, at 22:34:41, Greg Guerin wrote:
> Rick Mann wrote:
>
>> Note that the precision of all this isn't so high as to make this "hard" real time. It just has to be good enough that a person watching the display and comparing it (visually) to an accurate clock would consider them to be synchronized. I'd like to do no worse than 100 ms.
>>
>> Any ideas?
>
>
> I can tell you from experience that 100 ms will be visually noticeable. More than you might think.
>
> In any case, to get the display to update ON the second you'd have to change the labels and such BEFORE the second actually occurs.
>
> And you'd have to account for any discrepancy between the software's clock and the unidentified "accurate clock". If the software doesn't know what the accurate clock is, how would it know its accuracy, so how could you know that a person won't see a difference, even if the display is exactly "on the second"?
Well, I've implemented an SNTP client to improve the clock accuracy. I guess what I'm really asking is, how long after I exit the run loop before drawing is complete?
And yeah, I'd like to do better than 100 ms.
--
Rick
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