[Xquartz-dev] GLX stereo and old hardware: request for enable_stereo

[Martin Otte]

I just wanted to post a summary of my problem where the latest X11  
server on Tiger says that it can do stereo glx visuals, but any  
program that attempts to create a stereo window crashes.

I tested with a non-X11 CGL program, and I get the same behavior. The  
problem is that my computer (Powerbook G4, OSX 10.4.11) advertises  
that opengl can do stereo, but it can only do stereo in full screen  
mode, not per-window.

Since Apple's opengl says that it can do stereo, the X server sets up  
all of the stereo glx visuals. But just like the native CGL programs  
that I tried, any glx program that tries to create a windowed stereo  
visual crashes with an error because it is not full screen.

I don't know if this is specifically a problem with Tiger or with  
older hardware. An old G4 tower with an ATI video card running 10.4  
displays the same behaviour.

I must have run into this problem before because I had set  
enable_stereo to false in my x11 preferences, but this option seems  
to be ignored with the recent X11 servers.

Can you bring back the enable_stereo preference option? It should  
default to true it not set, but allow one to turn off stereo visuals  
if the older hardware wrongly advertises that it can do stereo.

Thanks,
Martin