Hi, > DirectFB does not manage the cache stuff at unlock time but only at lock > time. This is a "lazy" cache management.
Yes, I know. > In the end, it remains to your gfxdriver to implement the FlushReadCache > function to unsure the read cache is flushed when requested by DirectFB. That was implemented too. However, I'm still observing some rendering glitches especially when drawing text on the primary surface. I'm going to investigate a bit more and try to come back with a proper scenario. Regards, Ilyes Gouta. On Wed, Oct 21, 2009 at 12:49 AM, Lionel Landwerlin <llandwer...@gmail.com> wrote: > Le lundi 19 octobre 2009 à 14:42 +0100, Ilyes Gouta a écrit : >> Hi, >> >> I'm dealing with a configuration where the video RAM is mapped into >> the user-space application as a cached region. What happens if the >> destination is the framebuffer (VRAM) which was locked and then >> written to using the CPU? Don't we need a: >> >> if (allocation->accessed & CSAF_CPU_WRITE) >> dfb_gfxcard_flush_texture_cache(); >> >> in dfb_surface_buffer_unlock() (surface_buffer.c) ? >> > > Hi Ilyes, > > DirectFB does not manage the cache stuff at unlock time but only at lock > time. This is a "lazy" cache management. > When accessing a buffer (read or write), DirectFB first looks at the > last operation done on this buffer, and according to this last operation > it knows if there is some synchronization stuff to do. > > If you're interested in, have a look at the dfb_surface_buffer_lock > function. Espacialy the "Manage access interlocks" part. > > In the end, it remains to your gfxdriver to implement the FlushReadCache > function to unsure the read cache is flushed when requested by DirectFB. > > Regards, > > -- > Lionel Landwerlin <llandwer...@gmail.com> > > _______________________________________________ > directfb-dev mailing list > directfb-dev@directfb.org > http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev > _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
