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[directfb-dev] Re: Seeing "tearing" using mplayer dfbmga
On Sun, Dec 08, 2002 at 08:47:27AM +0500, Antonino Daplas wrote: > On Sun, 2002-12-08 at 04:16, Ville Syrjälä wrote: > > But perhaps the blit hasn't completed when we flip the buffers... Ok, I > > admit to being an idiot. When I added the vsync stuff I copied it straight > > out of the fbdev stuff without thinking. The gfxcard_sync(); is totally > > misplaced. Obviosly it should be before programming the registers not > > after. I attached a patch to fix this. > > > > This depends on the hardware though. Talking about Matrox CRTC2 here. > In some hardware, flips are > automatically done during vblank, thus you can actually program the > registers then wait for vsync (or not wait at all). This one is perfect > for mplayer since it already regulates the frame rate via time stamps, > and flips are automatically done during vblanks without additional CPU > penalty. > > In others, flips are independent of vblank/vsync (async flips). In this > case you have to wait for vsync, then touch the registers to avoid > tearing effects. Yours is most probably this case. ?? > This is precisely the reason I asked for further differentiation of the > wait_for_vsync flags in a message I sent some time ago. I don't think I've seen that message. And didn't find anything in the archives either. -- Ville Syrjälä email@example.com http://www.sci.fi/~syrjala/ -- Info: To unsubscribe send a mail to firstname.lastname@example.org with "unsubscribe directfb-dev" as subject.