On Wed, Mar 04, 2015 at 08:44:19PM -0800, Kenneth Graunke wrote: > A while back I switched intel_blit_framebuffer to prefer Meta over the > BLT. This meant that Gen8 platforms would start using the 3D engine > for blits, just like we do on Gen6-7.5. > > However, I hadn't considered Gen4-5 when making that change. The BLT > engine appears to be substantially faster on 965GM than using Meta to > drive the 3D engine. This isn't too surprising: original Gen4 doesn't > support tile offsets (that came on G45), and the level/layer fields > don't work for cubemap rendering, so for inconvenient miplevel > alignments, we end up blitting or copying data to/from temporaries > in order to render to it. We may as well just use the blitter. > > I chose to use the BLT on Gen4-5 because they use the same ring for > both 3D and BLT; Gen6+ splits it out. > > Fixes regressions on 965GM due to botched tile offset code (we should > fix those properly as well, but they're longstanding bugs - for now, > put things back to the status quo). > > Signed-off-by: Kenneth Graunke <kenn...@whitecape.org> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89430 > Cc: "10.5" <mesa-sta...@lists.freedesktop.org> > Cc: Mark Janes <mark.a.ja...@intel.com>
Reviewed-by: Topi Pohjolainen <topi.pohjolai...@intel.com> _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
