Re: Throttling drawing to vertical refresh
Re: Throttling drawing to vertical refresh
- Subject: Re: Throttling drawing to vertical refresh
- From: Andreas Falkenhahn via Cocoa-dev <email@hidden>
- Date: Fri, 23 Oct 2020 17:51:45 +0200
The problem with that approach is that I'd need to find out the monitor's
refresh rate in order to calculate "nextUpdateTime" and I'm not sure if I can
get this information from all monitors reliably.
On 19.10.2020 at 00:09 Alex Zavatone wrote:
> It shouldn’t be too hard to roll your own simply based on milliseconds of a
> timer.
> Even a simple
if (myMilliseconds >> nextUpdateTime) {
> [updateObject doThatUpdate];
> nextUpdateTime = myMilliseconds + msThrottle;
> }
> lets you get a basic throttle.
>
> Cheers,
> Alex Zavatone
>> On Oct 15, 2020, at 2:13 PM, Andreas Falkenhahn via Cocoa-dev
>> <email@hidden> wrote:
>> I'm drawing inside an NSView by simply setting its layer's contents to a
>> CGImage which is updated for every frame, e.g. something like this:
>> dp = CGDataProviderCreateWithData(NULL, frameBuf, frameBufSize, NULL);
>> im = CGImageCreate(frameWidth, frameHeight, 8, 32, frameStride,
>> theColorSpace, (CGBitmapInfo) kCGImageAlphaNoneSkipFirst, dp, NULL, FALSE,
>> kCGRenderingIntentDefault);
>> view.layer.contents = (id) im;
>> CGImageRelease(im);
>> CGDataProviderRelease(dp);
>> This works fine except that there is no throttle so this will draw as fast
>> as the CPU allows, which of course is a waste of CPU cycles because the
>> monitor only refreshes a certain amount of times per second.
>> So is there a convenient way to throttle drawing to the monitor's refresh
>> rate or does this have to be done the hard way by querying the monitor's
>> refresh rate and then setting up a timer which draws in exactly those
>> refresh intervals or how should this be done?
>> Note that I'd like to avoid using OpenGL or Metal or whatever is the
>> standard nowadays but I'm mainly interested in an AppKit solution...
>> --
>> Best regards,
>> Andreas Falkenhahn mailto:email@hidden
>> _______________________________________________
>> Cocoa-dev mailing list (email@hidden)
>> Please do not post admin requests or moderator comments to the list.
>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>> Help/Unsubscribe/Update your Subscription:
>> This email sent to email@hidden
--
Best regards,
Andreas Falkenhahn mailto:email@hidden
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden