Okay,
I just investigated this issue a little more. It only happens under one
condition for me, which is that I created an NSOpenGLPixelFormat before the
CGDisplay calls, i.e. this does not work as expected:
#import "AppDelegate.h"
#include <CoreGraphics/CoreGraphics.h>
@implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
// Insert code here to initialize your application
NSOpenGLPixelFormatAttribute attrs[] =
{
NSOpenGLPFADoubleBuffer,
0
};
NSOpenGLPixelFormat* pixelFormat = [[NSOpenGLPixelFormat alloc]
initWithAttributes:attrs];
CFArrayRef allModes = CGDisplayCopyAllDisplayModes(CGMainDisplayID(), NULL);
if(allModes)
{
for(int i = 0; i < CFArrayGetCount(allModes); i++)
{
CGDisplayModeRef mode =
(CGDisplayModeRef)CFArrayGetValueAtIndex(allModes, i);
Size width = CGDisplayModeGetWidth(mode);
Size height = CGDisplayModeGetHeight(mode);
if(width == 800 && height == 600)
{
CGDisplaySetDisplayMode(CGMainDisplayID(), mode, NULL);
//CGDisplaySetDisplayMode((CGDirectDisplayID)_id, mode, NULL);
break;
}
}
CFRelease(allModes);
}
}
@end
while the same code without the creation of the NSOpenGLPixelFormat does. this
is really really odd, is there any way to fix this? Bug?
Best,
Matthias
Am 21.05.2014 um 14:05 schrieb Matthias Dörfelt <[email protected]>:
> Hey,
>
> I am experiencing some really weird behavior with CGDisplaySetDisplayMode
> behavior on osx 10.9.3 on a late 2013 retina mbp.
>
> if I call CGDisplaySetDisplayMode only once, it seems to end up in weird
> display modes, that are not even listed through CGDisplayCopyAllDisplayModes
> i.e. oftentimes 16 bit modes. If I call CGDisplaySetDisplayMode again right
> afterwards, it goes to the desired mode. Here is a very simple example:
>
> if I do:
>
> GDisplayModeRef originalMode = CGDisplayCopyDisplayMode(CGMainDisplayID());
> CGDisplaySetDisplayMode(CGMainDisplayID(), originalMode, NULL);
> CGDisplayModeRelease(originalMode);
>
> It goes from the current mode (1440x900,32 bit hidpi) to the same mode in 16
> bit!!
>
> If I do:
>
> GDisplayModeRef originalMode = CGDisplayCopyDisplayMode(CGMainDisplayID());
> CGDisplaySetDisplayMode(CGMainDisplayID(), originalMode, NULL);
> CGDisplaySetDisplayMode(CGMainDisplayID(), originalMode, NULL);
> CGDisplayModeRelease(originalMode);
>
> it arrives at the correct mode.
>
> This is the simplest test case I could come up with as I was getting similar
> garbage when using CGDisplayCopyAllDisplayModes
> to select a specific mode, i.e:
>
>
> CFArrayRef allModes = CGDisplayCopyAllDisplayModes(_id, NULL);
> if(allModes)
> {
> for(int i = 0; i < CFArrayGetCount(allModes); i++)
> {
> CGDisplayModeRef mode =
> (CGDisplayModeRef)CFArrayGetValueAtIndex(allModes, i);
>
> Size width = CGDisplayModeGetWidth(mode);
> Size height = CGDisplayModeGetHeight(mode);
>
> if(width == 800 && height == 600)
> {
> CGDisplaySetDisplayMode((CGDirectDisplayID)_id,
> mode, NULL);
> //CGDisplaySetDisplayMode((CGDirectDisplayID)_id,
> mode, NULL);
> break;
> }
> }
>
> CFRelease(allModes);
> }
>
> Only properly goes to 800x600 if I uncomment the second call to
> CGDisplaySetDisplayMode this seems really odd…
> Any ideas?
>
> thanks,
> Matthias
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