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Re: Problem with NSOpenGLView


From: Eric Wasylishen
Subject: Re: Problem with NSOpenGLView
Date: Sat, 21 Aug 2010 14:22:35 -0600

Hm.. the segfault is in glGetError. It sounds like this bug, where glGetError 
segfaults if there is no current context (maybe try the example code given 
there?)
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/318043

However, there may be something going wrong on GNUstep's side as well. Do other 
OpenGL apps work on your system?

On Aug 21, 2010, at 1:28 PM, German Arias wrote:

> I added the line in awakeFromNib method, but the same problem. This is the 
> gdb output:
> 
> (gdb) run
> Starting program: /home/german/Practicas/GL/GL.app/GL
> [Thread debugging using libthread_db enabled]
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x0018e246 in glGetError () from /usr/lib/libGL.so.1
> (gdb) backtrace
> #0  0x0018e246 in glGetError () from /usr/lib/libGL.so.1
> #1  0x0122ad01 in -[XGGLPixelFormat drawableForWindow:] (self=0x8339c20,
>   _cmd=0x124d120, xwindowid=27263014) at XGGLFormat.m:417
> #2  0x0122d1a3 in -[XGGLContext setView:] (self=0x8158798, _cmd=0x559828,
>   view=0x83387f8) at XGGLContext.m:485
> #3  0x00399544 in -[NSOpenGLView openGLContext] (self=0x83387f8, 
> _cmd=0x559888)
>   at NSOpenGLView.m:133
> #4  0x00399772 in -[NSOpenGLView _lockFocusInContext:inRect:] (self=0x83387f8,
>   _cmd=0x59c0d0, ctxt=0x83343a8, rect=...) at NSOpenGLView.m:225
> #5  0x00439955 in -[NSView displayRectIgnoringOpacity:inContext:] (
>   self=0x83387f8, _cmd=0x59c130, aRect=..., context=0x83343a8)
>   at NSView.m:2478
> #6  0x00439c6f in -[NSView displayRectIgnoringOpacity:inContext:] (
>   self=0x8337460, _cmd=0x59c130, aRect=..., context=0x83343a8)
>   at NSView.m:2512
> #7  0x00439c6f in -[NSView displayRectIgnoringOpacity:inContext:] (
>   self=0x8330408, _cmd=0x59c130, aRect=..., context=0x0) at NSView.m:2512
> #8  0x0042bb7c in -[NSView displayRectIgnoringOpacity:] (self=0x8330408,
>   _cmd=0x59c120, aRect=...) at NSView.m:2425
> #9  0x00439449 in -[NSView displayIfNeededInRectIgnoringOpacity:] (
>   self=0x8330408, _cmd=0x59c110, aRect=...) at NSView.m:2357
> #10 0x0042b9d7 in -[NSView displayIfNeededInRect:] (self=0x8330408,
>   _cmd=0x59c108, aRect=...) at NSView.m:2335
> ---Type <return> to continue, or q <return> to quit---
> #11 0x0042b7dc in -[NSView displayIfNeeded] (self=0x8330408, _cmd=0x5a2db0)
>   at NSView.m:2317
> #12 0x00442a0e in -[NSWindow orderWindow:relativeTo:] (self=0x8330300,
>   _cmd=0x5a2d78, place=NSWindowAbove, otherWin=-1) at NSWindow.m:1735
> #13 0x0043e418 in -[NSWindow orderFrontRegardless] (self=0x8330300,
>   _cmd=0x502010) at NSWindow.m:1652
> #14 0x002c85bd in -[NSApplication activateIgnoringOtherApps:] (self=0x815da18,
>   _cmd=0x5020c0, flag=1 '\001') at NSApplication.m:1272
> #15 0x002c76e3 in -[NSApplication finishLaunching] (self=0x815da18,
>   _cmd=0x502398) at NSApplication.m:1095
> #16 0x002ca07f in -[NSApplication run] (self=0x815da18, _cmd=0x4f8180)
>   at NSApplication.m:1508
> #17 0x002a9c0a in NSApplicationMain (argc=1, argv=0xbfffe544) at 
> Functions.m:89
> #18 0x08048c27 in main (argc=1, argv=0xbfffe544) at GL_main.m:28
> 
> 
> Eric Wasylishen escribió:
>> Hey,
>> Could you run it in gdb and post the stack trace?
>> 
>> I had some trouble with pixel formats causing segfaults. In a Cocoa app I 
>> was working on porting, I had to add this line in the NSOpenGLView 
>> subclass's -awakeFromNib method:
>> 
>> [self setPixelFormat: [NSOpenGLView defaultPixelFormat]];
>> 
>> Perhaps GNUstep's NSOpenGLView -initWithCoder method needs some tweaking?
>> 
>> Eric
>> 
>> On Aug 20, 2010, at 5:20 PM, German Arias wrote:
>> 
>>  
>>> I'm trying to use NSOpenGLView, but I'm facing some problems. And I'm not 
>>> sure if this is a problem with my GL installation or a problem on GNUstep. 
>>> I have a simple app:
>>> 
>>> 1) Make a new app with PC.
>>> 2) Edit the gorm file: Add a window and a CostomView.
>>> 3) Make a subclass of NSOpenGLView.
>>> 4) Set the class of CustomView to the new subclass.
>>> 5) Add the necessary flags and directories to use GL.
>>> 6) Compile the app.
>>> 7) Test the app: Segmentation fault.
>>> 
>>> Any suggestion? I have some code into the method drawRect:. But even if I 
>>> comment this code, the app crash.
>>> 
>>> _______________________________________________
>>> Discuss-gnustep mailing list
>>> address@hidden
>>> http://lists.gnu.org/mailman/listinfo/discuss-gnustep
>>>    
>> 
>> 
>>  
> 




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