Hello; ext Siarhei Siamashka wrote: > On Feb 18, 2008 9:39 AM, Tapani Pälli <[EMAIL PROTECTED]> wrote: > >>> When using the supplied SDL library for doing timer-based frame >>> rendering, there seems to be >>> - heavy tearing >>> >> Tearing unfortunately happens because there is no vsync available for >> framebuffer driver to use. >> > > Could you please verify and confirm this information? Framebuffer > driver from OS2007 supported tearsync (via OMAPFB_FORMAT_FLAG_TEARSYNC > flag as Frantisek mentioned), and it was used at least for video. > Well, I have noticed some tearing in mplayer with OS2008 though. > > This is what I've heard from our kernel team members, maybe they could share some more light to this. AFAIK the hardware itself does not offer sync.
>>> Q: I can't get the tearing away (only fixed at certain line positions). >>> What am I doing wrong? >>> >>> >>> >> Nothing, you cannot get away from tearing. >> > > Still what about trying different LCD panel timings? For example, > reducing LCD refresh rate to something like 40Hz should allow 20 full > resolution fullscreen rgb updates per second with perfect tearsync. I > Hmm, but how do you know when to start drawing? > don't dare trying such experiments myself as I'm afraid to kill LCD > panel of my N800 :) Can any HW expert tell if it can be possible? Link > to LCD controller docs is available earlier in this thread. > > On the other hand, reducing refresh rate may introduce problems for 25 > and 30 fps video playback (for high resolution video only, when the > time to transfer frame data over graphics bus is larger than one LCD > refresh cycle). > // Tapani Pälli -- Software Engineer Open Source Software Operations _______________________________________________ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
