I was poking around the 7.4 release notes, and saw, hey, GLX passthrough for Xephyr! Great!
I gave the version installed with Ubuntu (Intrepid) a whirl, and while OpenGL applications work*, they aren't accelerated (indirectly or no) which is what I would expect "passthrough" to mean. So, questions: 1. Am I interpreting "GLX passthrough" wrong? Is the functionality I'm hoping for even implemented? 2. If so, does it look like Ubuntu is disabling this feature in their build? 3. Or am I failing to enable it on the command line? I've tried most variations on +extension GLX, nodri, and so forth, but I could have missed something. 4. Is there another way to do what I'm trying to do? What I'm trying to do: I want to capture all the windows of some arbitrary X application as GL textures, then render them in some way, without any of this output showing up on screen (except where I finally render things, obviously). To get the window contents, I was going to redirect window contents to a texture with Composite / texture_from_pixmap. This is fine if (1) the app creates only one window, and (2) is quite cooperative with respect to where it draws that window -- like, say, the xscreensaver hacks. If I want to capture Firefox, on the other hand, with dialogs and menus popping up all over the place, it seems like the thing to do to do is run another X server, run a window manager on that server, launch whatever apps I need, then capture the whole screen. Another way of doing this, of course, is to just launch another X server. But I don't know if texture_from_pixmap works across servers, and more saliently, I can't get an X server to launch without switching me to its VT (-novtswitch having no noticeable effect). * - Actually, some of the xscreensaver hacks refuse to draw on the root window, saying it doesn't support GLX visuals. I'm not sure what's up with that, but I'll also happily not care if everything else works. Ideas? ~ violet _______________________________________________ xorg mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/xorg
