Hi,[...]
I have heard from the xscreensaver maintainer, after I mentioned that I could run OpenGL xscreensaver hacks by doing (e.g.)
$ flyingtoasters -root
but that they all failed when launched from xscreensaver. His reply was:
The window that it's drawing on might have a different visual ID, if the ID printed by "xscreensaver-gl-helper" is not the default visual (according to xdpyinfo.)
If that's the case, you can't run GL hacks on your real root window (only on a virtual root window) and there's nothing you can do about it
Well, xscreensaver-gl-helper gives:
$ xscreensaver-gl-helper 0x25
But xdpyinfo says:
$ xdpyinfo
So xscreensaver needs visual 0x25 but the default visual is 0x23. Now I'm not entirely sure what's happening here, but the xscreensaver author does imply that this is definitely a driver issue.
An issue perhaps, but not a bug.
There's no X or GLX policy that says the root window must use a GLX visual that features a depth buffers, stencil buffer, alpha channel, double-buffering, etc.
-Brian
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