Re: Staying on integrated GPU while using NSOpenGLView
Re: Staying on integrated GPU while using NSOpenGLView
- Subject: Re: Staying on integrated GPU while using NSOpenGLView
- From: Nick Zitzmann <email@hidden>
- Date: Tue, 11 Jun 2013 14:39:52 -0600
On Jun 10, 2013, at 10:03 PM, Miguel Pontes <email@hidden> wrote:
> Hello,
> I'm having issues getting an app to not trigger switching to the dedicated GPU when using NSOpenGLView.
[…]
> Is there anything I'm doing wrong? I've read on this mailing list before (http://lists.apple.com/archives/cocoa-dev/2011/Mar/msg00795.html) that specifying certain pixel formats could cause the discrete GPU to be triggered, but I'n not even defining any pixel format when I'm initting the NSOpenGLView, just a simple [super initWithFrame:frameRect].
No, you're not doing anything wrong. I was curious about this as well, and I noticed that, starting in 10.8.4, instantiating an IKImageBrowserView will not toggle the discrete GPU. So I tried to figure out what it was doing, and found it uses four pixel formats: NSOpenGLPFAAllowOfflineRenderers, NSOpenGLPFANoRecovery, NSOpenGLPFAAccelerated, and a mysterious pixel format identified as 1262.
The first three of the above are standard pixel formats, but the 1262 format doesn't appear to be documented anywhere. I found out that adding the undocumented pixel format in addition to the three above apparently prevents the discrete switch-over from happening. Since it's undocumented, the usual disclaimers apply: use it at your own risk, it may break in the future, and all that.
Nick Zitzmann
<http://www.chronosnet.com/>
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