[Plib-users] Re: flightgear problem

[Stephen L. <le...@na...>]

Gentlemen,
I have joined this list because I have the "flightgear" problem.
I have just read a weeks worth of discussion concerning the
"ssgInit called without a valid OpenGL context". I tried to compile
FlighGear 0.7.8 on a PowerPC running YellowDogLinux 2.0.
Although based on RH 7 there is no MMX and the compiler is 2.95.3
There has been much speculation and not much science in this discussion.
I compiled the plib_examples and get the same message from
examples/src/ssg/tux/tux_example and examples/src/ssg/viewer/viewer
Further investigation indicates that *after* calling 'glutCreateWindow'
there is no valid OpenGL context according to 'ssgInit'. How does
ssgInit
determine this? It calls 'glXGetCurrentContext' which returns NULL even
though 'glutCreateWindow' thinks it has created a valid context..
Thus the root of the problem is an incompatibility between:
'glutCreateWindow' and 'glXGetCurrentContext'. 'ssgInit' doesn't
have much to do with it except that it generates the error message.
It is easier to debug a small program with these two calls than
to begin with FlightGear...
Now my question, to which groups should this information be directed?
Thsnks for interest,
Stephen Lewis
Platform Macintosh G4 Cube and YellowDogLinux 2.0
OpenGL 1.2, Mesa 3.4 and GLUT 3.7