Hi Michele,
On Tue, Jan 17, 2006 at 06:03:59PM +0100, Michele Puccini wrote:
> > Unfortunately there's no way to have a vsynced BufferStrategy for a
> > non-fullscreen window.
>
> Visual results can be a way better if we use WaitForVerticalBlank() from
> directshow. I did some experiments and, yes, the output doesn't suffer of
> the "tearing" effect you get without synchronization. Of course you'll have
> to be fast enough to blit the entire buffer by the time of 1 scanline.
> Results are really encouraging.
> I'm going to implement this feature into a simple JNI lib. I already have
> multi-monitor support, so that you can synch with the VBlank of the monitor
> you're open on.
As long as you're there and you'll implementing this anyway, why not
try to implement it for the jdk? You can join the mustang
development community:
http://mustang.dev.java.net
It'd take a while to setup the build environment, but I can point
you to the right blogs and such..
But I see that WaitForVerticalBlank is not supported everywhere,
so it won't be that easy.
> RFE: It would be nice to have a .show(boolean VSynch) in java2d. The main
> problem is the CPU load: the caller waits until it gets the vsynch. The
> implementation could setup an event and be signalled when the vsynch
> arrives.
Well, the users don't complain about this for the full-screen
BufferStrategy (aka FlipBufferStrategy).
I don't think asynchronous vsync event is a good idea, though, as it
typically turns out to be too much hassle and potential
multithreading issues.
> 3)
>
> > This sounds interesting. I'm not sure how exactly you implemented
> > this so I can't say why it doesn't work in a full-screen window.
> >
> > Are you adding your canvas to a frame and then entering the
> > full-screen with that frame or something like that?
>
> Exactly. I'm using the VMR9 Video Mixing Renderer Filter (windowless mode).
> The implementation uses a Canvas. I get its HWND by JAWT and paint the
> videoclip frame there, at Canvas bounds. It's real fun to use. Players can
Hmm. I don't see why it wouldn't work.
Do you use BufferStrategy with the same canvas? Could your
rendering be overwritten by the contents of the back-buffer?
Could you try running your app with ddraw disabled
(-Dsun.java2d.noddraw=true)?
Also, do you add your canvas before or after entering the
full-screen mode? We do some funny stuff under the covers when
entering the full-screen mode (especially if you're using Window
instead of Frame to enter the FS mode).
> be layouted, added, removed, etc. Of course overlapping components are not
> handled, as it would require a frame-capture of the clip.
>
> I can send you something (jars, src, test code), if you want.
Well, unfortunately I don't have much time to look at it..
I wonder if our Java Media team would be interested? I've cc-ed Tony
Wyant.
Thanks,
Dmitri
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