On Jun 10, 2013, at 10:03 PM, Miguel Pontes <miguelpon...@gmail.com> 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/> _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
