Re: Vertical retrace interrupts?

[Antonino Daplas <adaplas@pol.net>]

On Thu, 2003-01-30 at 19:45, Michel Dänzer wrote:
> On Don, 2003-01-30 at 03:34, Antonino Daplas wrote:
> > On Wed, 2003-01-29 at 03:21, James Simmons wrote:
> > > 
> > > > Are there any plans on merging DirectFB features? Stuff like vertical
> > > > retrace interrupts etc.?
> > 
> > I wholeheartedly agree with this.  There are a lot of applications out
> > there (especially video players) where vtrace signal delivery is
> > critical for optimum operation.  Polling for VGA registers is not
> > totally correct for newer cards and is too inefficient, so this has to
> > be done at a per driver level.
> 
> Let me point out that the DRM in XFree86 4.3.0 and 2.5 kernels has a
> generic ioctl which can block or send a signal on vertical blank
> interrupts.
> 
> 

Yes, I've seen the dri list archives, and adding support for this in
fbdev will result in code dupliation :-(.

However, at least 3 people have mailed me that they are using their
somewhat old pc as a set top box with mplayer, DirectFB and i810fb. No
X.  The image instability is noticeable because they are driving
big-screen TV's, especially because DirecFB is double-buffered, with
triple-buffering in the TODO list.  It's because of this that I have to
hack in vretrace signal delivary to i810fb.  There's also a similar
patch for matroxfb.


Tony




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