[Bug 20505] radeon planar textured video

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=20505





--- Comment #10 from Fabio <fabio.ped at libero.it>  2009-04-17 09:01:20 PST ---
(In reply to comment #9)
> (In reply to comment #8)
> > Nice but I noticed two problems with my RV530:
> > 1) the new attributes have effects only when BICUBIC is 0, but not when BICUBIC
> > is 2 but disabled because the image is not scaled;
> 
> This is the intended behavior.  If bicubic is enabled or auto, I don't enable
> the attributes since it would be confusing to have the effects suddenly
> disappear when the video gets scaled.  The only way to use them is to disable
> bicubic (XV_BICUBIC = 0).

OK. What about changing the default of the bicubic from auto to no, since it
has this limitation (that also confuses users) and it causes slowdown (and also
I dislike its smoothing effect)?

> > 2) with a small video (512x368) I noticed a 8% speedup (with mplayer -benchmark
> > -quiet -nosound filename) no matter XV_SYNC, with a larger video (1280x720) I
> > noticed a slowdown (over 61% and the video is jerkily), unless XV_SYNC is
> > disabled, where I get the same performance. But maybe this is a collateral
> > effect of the XV_SYNC that must paint all the frames and is noticeable only
> > when doing benchmark (i.e. fps > video refresh)?
> > 
> 
> XV_VSYNC is unrelated to these changes.  It will decrease performance in
> benchmark type scenarios because it stalls the engine while it waits for the
> current vline to pass beyond the video.  It's used to avoid tearing.  Turn it
> off for benchmarking.

OK, thanks for clearing this. The strange thing, however, is that before the
latest xv merge I got the same performance with or without vsync enabled, while
now I get the previous performance only with the vsync disabled and a large
slowdown with it enabled.

Thanks


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