When taking screenshot about rainsaver HOT 1 OPEN

Hi, thank you for your feedback.

The crashing problem can by partially solved by this way: install the newly built screensaver bundle, and goto system preference and switch to it, then quit from system preference. Do not preview or switch to other screensaver. It will work when screensaver actually launched by system. Crashing only occurs in system panel. Or, you can just run it with Xcode, it will work too.

As long as I know, after many hours debugging, this crashing problem is caused by function call to OpenCL. Apple provides a convenient OpenCL initializing api set called gcl, but without detailed documentation. I used gcl in this program for its convenience. It seems that in system preference panel, the screensaver instance is not fully deallocated when you switch between different screensaver(although deallocate function is called). But gcl api have some problem in this situation. When you switch from this screensaver to another, and then switch back, an gcl error happens which says that gcl can not be initialize twice(which means program is not fully deallocated), and cause the whole system preference program to crash. I have done all the releasing step in deallocating function, but it still crashes. I tracked this problem using syslog, but couldn't solve it. May be I should stop using gcl and using OpenCL standard api instead, which require more work to do with OpenCL kernel launching and initialization.

The "black screen" bug may be solved by your advice, thank you for your tip. This project is a final project of my graphic course. Because these bug, I used a window instead of real screensaver to do the presentation :(

from rainsaver.