[PD] [UPDATED] can signal inlets that aren't the main inlet have float or message methods?

[Matt Barber]

One last thing:

Since obj_findsignalscalar() isn't in m_pd.h, you have to declare it in
your code:

EXTERN t_float *obj_findsignalscalar(t_object *x, int m);

On Thu, Jul 14, 2016 at 3:46 PM, Matt Barber <brbrofsvl at gmail.com> wrote:

> Also, to be clear the effect will only take with dsp running, so it
> depends on the use case. You couldn't use this to pipe messages from the
> right inlet to an outlet (say) without dsp running, but most signal objects
> don't have that kind of behavior in the first place.
>
> On Thu, Jul 14, 2016 at 12:47 PM, Alexandre Torres Porres <
> porres at gmail.com> wrote:
>
>> > I found a way to simulate this behaviour
>>
>> I just wanna publicly thank you for being awesome :)
>>
>> > (only for floats, not for anythings)
>>
>> it works for most of cyclone issues... more than in scope~, this is
>> really crucial for other 4 objects in cyclone (bitand~, bitor~, bitxor~,
>> delay~ [as in max7])
>>
>> cheers
>>
>> 2016-07-14 13:29 GMT-03:00 Matt Barber <brbrofsvl at gmail.com>:
>>
>>> ​Hello list,
>>>
>>> Back in March we had a discussion about getting signal ​inlets other
>>> than the main one to use floats as messages rather than signals.
>>>
>>> I found a way to simulate this behavior (only for floats, not for
>>> anythings). A little background:
>>>
>>> If you have a signal inlet, when you send a float to it, it stores that
>>> float in a field that the ugen graph function retrieves if it notices that
>>> inlet has no signal connection: if there's at least one signal connected,
>>> those are used, but if not, the float scalar is promoted to a signal. You
>>> can update that scalar even while a signal is connected.
>>>
>>> You need to #include "g_canvas.h" to get started.
>>>
>>> So the idea here is:
>>> 1) in the new() routine, get access to the float scalar for your inlet
>>> from within your object class.
>>>
>>> 2) in the new() routine, optionally set the scalar field with a default
>>> or a creation arg.
>>>
>>> 3) check manually in your dsp() routine to see if that inlet has a
>>> signal connection feeding it. If so, then the scalar is ignored and you can
>>> use the signal as is. However, if you want the inlet to have zeroes when
>>> there's no signal inlet, rather than the scalar, you have to let your
>>> perform() routine know.
>>>
>>> 4) in the perform() routine, poll the scalar field for changes.
>>>
>>>
>>> -------------------------------------------
>>> Before you can do 1) and 2), you need to keep the t_inlet pointer
>>> returned from inlet_new, something like:
>>>
>>> x->x_rightinlet = inlet_new((t_object *)x, (t_pd *)x, &s_signal,
>>> &s_signal);
>>>
>>> For 1), get a pointer to the float field and save it:
>>>
>>> x->x_signalscalar = obj_findsignalscalar(x, 1); // second arg is the
>>> inlet index
>>>
>>> Then to use it simply dereference it:
>>>
>>> float scalar = *x->x_signalscalar; // this probably goes in your
>>> perform() routine
>>>
>>> ---------------------------------------------
>>>
>>> For 2), you want to set the float in the field, so you can just call the
>>> default float routine for inlets:
>>>
>>> pd_float((t_pd *)x->x_rightinlet, f); // first arg is your inlet, cast
>>> as a (t_pd *), and the second is the input float
>>>
>>> ---------------------------------------------
>>>
>>> 3) is the trickiest part. The cyclone code does it this way:
>>>
>>> int forky_hasfeeders(t_object *x, t_glist *glist, int inno, t_symbol
>>> *outsym)
>>> {
>>>     t_linetraverser t;
>>>     linetraverser_start(&t, glist);
>>>     while (linetraverser_next(&t))
>>> if (t.tr_ob2 == x && t.tr_inno == inno
>>>    && (!outsym || outsym == outlet_getsymbol(t.tr_outlet))
>>>            )
>>>    return (1);
>>>     return (0);
>>> }
>>>
>>> Which is called like so:
>>> forky_hasfeeders((t_object *)x, x->x_glist, 1, &s_signal);
>>>
>>> This basically says "if there's a connection to the inlet in the 3rd
>>> arg, and it's from a signal outlet, return true." x->x_glist is set this
>>> way in the new() routine:
>>>
>>> x->x_glist = canvas_getcurrent();
>>>
>>> --------------------------------------------
>>>
>>> 4) now in your perform() routine you can poll for changes:
>>>
>>> t_float scalar = *x->x_signalscalar;
>>> if (scalar != x->x_scalar)
>>> {
>>> x->x_scalar = scalar;
>>> // do other stuff, call functions, etc.
>>> }
>>>
>>>
>>>
>>> I don't have time right now, but I'll make a minimal object later to
>>> illustrate.
>>>
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>>>
>>>
>>
>
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