[directfb-dev] Re: [PATCH] G450/G550 detection for CRTC2

[Ville Syrjälä <syrjala@sci.fi>]

On Tue, Dec 24, 2002 at 11:08:50AM -0500, a40e8119bbddbe7b3d281db117f19b32@interlinx.bc.ca wrote:
> > It allows mplayer to do something useful while we wait for the vsync.
> 
> Right.  I figured that.  But how much does it do while the thread
> waits for vsync though?

I haven't done any accurate measurments but it seems to help a bit.
Remember that mplayer is single threaded so any sleeping is just wasted
time.

> Do I have it all correct?

Yes.

> > Unfortunately this doesn't help as much as I'd like. Flip() waits
> > for the
> > card to become idle before flipping
> 
> What do you mean "idle"?  Is there a good reason to wait for it to be
> idle?

We wait for the drawing engine to finish whatever it was doing and also
wait for the bfifo to drain. Most register writes and all framebuffer
writes go through this fifo. If we don't wait the card may still be
drawing to the new front buffer.

-- 
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/


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