I wish that unoccluded or maybe just the frontmost window could be unredirected too, even if it's not fullscreen. The decorations and shadow could still be drawn in the Compositor Overlay Window.
I work on Linux on a program which is entirely drawn by OpenGL (I target ARM devices, but I test on the desktop before doing an ARM build). Application GL performance suffers immensely under a compositor, so on most machines I can't use GNOME3 (though I would like to). On machines where I get acceptable GL performance in my app, vsync is broken so there is constant tearing.
I'm sure there are some caveats with unredirecting the frontmost window -- like when it becomes occluded it would have to be redirected and that requires a round trip to the client (which might hang, etc), but there are probably other situations like this which the window manager has to deal with already (resize timers?) so maybe there is a way to implement it...
I work on Linux on a program which is entirely drawn by OpenGL (I target ARM devices, but I test on the desktop before doing an ARM build). Application GL performance suffers immensely under a compositor, so on most machines I can't use GNOME3 (though I would like to). On machines where I get acceptable GL performance in my app, vsync is broken so there is constant tearing.
I'm sure there are some caveats with unredirecting the frontmost window -- like when it becomes occluded it would have to be redirected and that requires a round trip to the client (which might hang, etc), but there are probably other situations like this which the window manager has to deal with already (resize timers?) so maybe there is a way to implement it...