trying to debug why i wasn't able to run flightgear on my laptop, i
think i found a problem with SGLookupFunction. the problem is that we
call dlclose() before we return the pointer to the GL function, and,
if i understand things correctly, this invalidates the handle and the
address might not be valid anymore (on my laptop i kept getting core
dumps).
anyway the fix is very simple: instead of calling dlopen() on libGL
and then passing the libGL handle to dlsym() one can simply invoke
dlsym on RTLD_DEFAULT (which is a special pseudo-handler that will
find the first occurrence of the desired symbol using the default
library search order). now i can run flightgear on both my laptop
(with a radeon mobility card) and on my desktop (nvidia card) and i
think the clouds actually look much better.
this is the patch:
RCS file: /var/cvs/SimGear-0.3/SimGear/simgear/screen/extensions.hxx,v
retrieving revision 1.13
diff -u -r1.13 extensions.hxx
--- simgear/screen/extensions.hxx 21 May 2004 14:50:49 -0000 1.13
+++ simgear/screen/extensions.hxx 23 Jun 2004 01:08:01 -0000
@@ -69,12 +69,7 @@
// GLX extension is *not* guaranteed to be supported. An alternative
// dlsym-based approach will be used instead.
- void *libHandle;
- void (*fptr)();
- libHandle = dlopen("libGL.so", RTLD_LAZY);
- fptr = (void (*)()) dlsym(libHandle, func);
- dlclose(libHandle);
- return fptr;
+ return (void (*)()) dlsym(RTLD_DEFAULT, func);
#endif
}
--alex--
--
| I believe the moment is at hand when, by a paranoiac and active |
| advance of the mind, it will be possible (simultaneously with |
| automatism and other passive states) to systematize confusion |
| and thus to help to discredit completely the world of reality. |
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