[PD] variable number of outlets/inlets /dynamic patching

Ivica Ico Bukvic ico at vt.edu
Tue Aug 14 15:51:20 CEST 2012

> On 08/11/2012 01:58 PM, Michael Zacherl wrote:
> > In Pd-extended it could be easier since there are more possibilities to
> control the init-phase of a just loaded patch.
> > I think it's in iemlib (Iohannes could chime in) but admittedly I
> > forgot about it, since also there was a lot of discussion wether this
> > should go into Vanilla or not,
> the secrect is [initbang], which fires when the abstraction is ready
> than [loadbang], which fires when all the patch (with all the
> sub-patches and what not) is ready)).
> unfortunately, i haven't found a way to make [initbang] without hacking Pd
> itself, so it's not part of any library (e.g. iemlib).
> instead, there is a (low-level) "patch" for Pd somewhere in the tracker,
> is applied to Pd-extended (but unfortunately not to Pd-vanilla).
> thus: if you want to need [initbang] (which you do if you really need
> in/outlets in abstractions), you need to either compile Pd yourself or use
> extended (only the core binary, no need for any externals here)
> fgmasdr
> IOhannes

Also, if you need a pre-loadbang event which happens right before loadbang
but after all the objects have loaded, you could try pd-l2ork which  has
also pre-loadbang event. Currently it is only being used for universal
presets that depend on the graph placement of all objects to keep track of
them. Therefore, the only time for the presets to detect objects they are
tied to correctly is only after they have all been created but before
loadbang (as one could loadbang a new preset which would not work unless all
the objects have been paired properly). The reason preset_hub and
preset_node do this is because this way a single preset can deal with
multiple instances of a same abstraction and still be able to distinguish
which one is being referenced. See pd-l2ork K12 mode for examples of how
this works (tl;dr: one abstraction hosts presets and keeps track of all
other abstractions and their states)...



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