On Wed, 2006-06-21 at 10:11 +0200, Martijn van Oosterhout wrote: > > I've got an r128 that, occasionally, draws 3D stuff outside its > window. More specifically, if a window moves or appears over the 3D > stuff, the 3D gets drawn over the upper window. AIUI it's the X > server's responsibility to set the clipping rectangles correctly.
The X server defines them, but with direct rendering, it's the client driver's responsibility to actually apply them to the hardware. > Since this only happens under load, what I think is happening is: > > - Program A sends continuous stream of graphics commands (no double buffering) > - User moves window over 3D output > - X server queues change in clipping rectangles > - Upper window is drawn by program B > - Program A scribbles over window > - Clipping rectangles eventually updated This should never happen because the Mesa driver should check for cliprect updates and apply them every time it acquires the hardware lock. It sounds like the r128 driver is failing to do that, or maybe it doesn't hold the hardware lock for all rendering. This is all assuming you're not running a compositing manager. -- Earthling Michel Dänzer | http://tungstengraphics.com Libre software enthusiast | Debian, X and DRI developer _______________________________________________ Mesa3d-dev mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
