Whenever I hear these things about the Mac and FLTK widgets and real-time
audio, I get nervous.

Here is my wish list for Csound5:

That there be Csound5 binaries which are cross-compatible and which:

1) perform all .csds performable in canonical Csound4 without change (except
for CsOptions);
2) include FLTK audio-oriented widgets;
3) include one or more real-time audio options, of which at least one is
multi-channel;
4) includes MIDI in.

Of course, I'm happy for there to be many versions of Csound5. What my
compositions require are the above items, and I very much hope that they are
implemented on *all* platforms--in at least one incarnation.

Art Hunkins

----- Original Message -----
From: "Victor Lazzarini" 
To: 
Sent: Monday, December 26, 2005 11:33 AM
Subject: Re: [Cs-dev] fl graphics on mac + rtaudio


> I have had some experience with the FLTK problem, as
> I have looked closely into it. The FLTK is not guaranteed to
> work on a second thread, although it works on OSX 10.3,
> Linux and Windows.
>
> With it running on the same thread it seems to work, but
> its interaction with the rest of the system might cause
> problems
> (as you mentioned with Cocoa). However, I seem to have it
> working here.
>
> I have also been playing with a Carbon-based simple GUI
> frontend for Csound5, which enables FLTK graphics to be
> used.
> There seems to be a problem somewhere, because FLTK
> trips up the event loop. I have hacked my way round it by
> putting the event  loop call in a loop.
>
> I am using a timer to fire up calls to csoundPerformBuffer,
> so
> I can have transport controls. FLTK widgets and graphics can
> be used.
>
> With Carbon it seems to be possible to do it  and my app has
> worked
> with FLTK graphics and widget opcodes. Since I don't know
> and am too lazy to Objective-C, I never tested Cocoa.
>
> With regards to audio IO, I would suggest you use the same
> system you had with MacCsound, which seems to be fast
> enough.
> The only thing that does not work with it is Digidesign IO
> (at
> least on a 10.4 with the digi 002).
>
> Somehow they seem to implement non-interleaved IO, but when
> you query the device, it does not seem to say so. Portaudio
> seems
> to adjust itself; my Coreaudio module has a parameter that
> can be
> used to set the type of output to non-interleaved.
>
> Victor
>
> > OK Thanks Istvan:
> >
> > > It is a known limitation of FLTK on OS X that you must
> > > run it in the main thread, and it is not safe to access
> > > the GUI from other threads at the same time.
> >
> > well even in the application thread FLTK takes over my
> > application's menus and other GUI items -- not too useable
> > for me.
> >
> > > To disable the FLTK graph displays, call
> > > csoundSetIsGraphable() with a setting of true between
> > > csoundPreCompile() and csoundCompile(), for example:
> >
> > that worked, thanks [ i wasn't calling precompile ]
> >
> >
> > >   CSOUND *csound = csoundCreate(NULL);
> > >   if (csoundPreCompile(csound) != 0)
> > >     error();    /* fail in some way */
> > >   csoundSetIsGraphable(csound, 1);
> > >   /* set your MakeGraph etc. callbacks here if there are
> > >   any */ /* ... */
> > >   if (csoundCompile(csound, argc, argv) != 0)
> > >     error();    /* fail in some way */
> > >   /* ... */
> > >
> > > The FLTK plugin will not register callbacks for drawing
> > > graphs if it is already graphable. Note that it will set
> > > a yield callback if any FLTK functionality (graphs or
> > > opcodes) is used, overriding your yield callback
> > > function if there is any.
> >
> > oh that's another point against FLTK --
> > i use Yield to tell csound to quit in the middle of a
> > render...
> >
> >
> > i seem to get coreaudio working but not portaudio.
> > the internal coreaudio is working fine, except seems to
> > not like multiple renders running simultaneously.
> >
> > i'll probably add my own coreaudio routines in this
> > frontend and add it to the cvs in the next couple of
> > days..
> >
> > Matt;
> > ________________________
> >            matt  ingalls
> > http://sonomatics.com
> >
> >
> >
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