I am trying to track down the source of a bug that causes, for lack of a
better word, corruption of my desktop after an application exits. I am
working on porting a VR application development library to use Cocoa for
windows, and the applications I am using for testing are test apps for the
library.
The bug occurs when I do full screen rendering. If I open an OpenGL window
full screen, everything is fine until I exit the application. At that point,
the desktop turns black temporarily, and then parts of it get refreshed as I
interact with the desktop. Using Expose refreshes the entire desktop. The
effect can be seen here:
http://www.137.org/patrick/fullscreen_exit_bug.png
This only happens if a window is opened full screen, and it only happens
after the application exits--or possibly during the exit process. If I close
the OpenGL window while the application is still running, everything looks
fine until I exit the application.
I open a full screen window using the basic procedure described in the
OpenGL Programming Guide for Mac OS X in the section titled "Using Cocoa to
Create a Full-Screen Context". Additionally, I make calls to
CGDisplayCapture() and CGDisplayRelease() at the appropriate times. I saw in
a post yesterday that using SetSystemUIMode() is preferred over capturing
the display, but I am not creating a kiosk.
A detail that may be important here is that the OpenGL rendering in the
software I am working on occurs in a spawned thread. By the time the
application exits, the OpenGL context has been closed, the thread exited,
and the auto-release pool for the thread destroyed. I don't know if this is
a factor, but it is something different than the examples I have been reviewing.
-Patrick
--
Patrick L. Hartling | VP Engineering, Infiscape Corp.
PGP: http://tinyurl.com/2oum9 | http://www.infiscape.com/
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