https://bugs.freedesktop.org/show_bug.cgi?id=30007 Marek OlÅÃk <maraeo@xxxxxxxxx> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED --- Comment #38 from Marek OlÅÃk <maraeo@xxxxxxxxx> 2011-01-04 13:31:44 PST --- First some findings. The current implemention of thumbnails in kwin is strictly targeted for GL3 hardware and should not work on GL2 hardware. This simple fact can be seen from how the GLSL shader looks like and what features it uses (you might also notice that the shader cannot be even ported to DirectX 9 without a complete rewrite). However, the GLSL compiler in Mesa does something fglrx didn't do: it lowers indirect addressing to conditional moves, but the cost is such shaders end up being too long and therefore very slow. This is something KDE people should fix if they want to ever compete with the performance of other compositors. So far my impression from reading Kwin shaders isn't very good and their shaders really need a broader review before getting accepted unless Kwin is a toy project not suitable for every day use. Commit 8543902bfbdfc15c39525bd99bee22e2f2126e74 fixes the Kwin thumbnails for R5xx GPUs, but we can't really do anything with the speed. One way to address this and other well-known performance issues with Kwin is to refraing from using loops in GLSL shaders. -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
