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/* Copyright (c) 2002-2003 krzYszcz and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
#include "m_pd.h"
#include "sickle/sic.h"
typedef struct _edge
{
t_sic x_sic;
t_float x_last;
int x_zeroleft;
int x_zerohit;
t_outlet *x_out2;
t_clock *x_clock;
} t_edge;
static t_class *edge_class;
static void edge_tick(t_edge *x)
{
/* CHECKED both may fire simultaneously */
if (x->x_zeroleft)
{
outlet_bang(((t_object *)x)->ob_outlet);
x->x_zeroleft = 0;
}
if (x->x_zerohit)
{
outlet_bang(x->x_out2);
x->x_zerohit = 0;
}
}
static t_int *edge_perform(t_int *w)
{
t_edge *x = (t_edge *)(w[1]);
int nblock = (int)(w[2]);
t_float *in = (t_float *)(w[3]);
t_float last = x->x_last;
while (nblock--)
{
float f = *in++;
if (last == 0.)
{
if (f != 0.)
{
x->x_zeroleft = 1;
if (x->x_zerohit)
{
clock_delay(x->x_clock, 0);
x->x_last = in[nblock - 1];
return (w + 4);
}
}
}
else
{
if (f == 0.)
{
x->x_zerohit = 1;
if (x->x_zeroleft)
{
clock_delay(x->x_clock, 0);
x->x_last = in[nblock - 1];
return (w + 4);
}
}
}
last = f;
}
if (x->x_zeroleft || x->x_zerohit) clock_delay(x->x_clock, 0);
x->x_last = last;
return (w + 4);
}
static void edge_dsp(t_edge *x, t_signal **sp)
{
dsp_add(edge_perform, 3, x, sp[0]->s_n, sp[0]->s_vec);
}
static void edge_free(t_edge *x)
{
if (x->x_clock) clock_free(x->x_clock);
}
static void *edge_new(t_floatarg f)
{
t_edge *x = (t_edge *)pd_new(edge_class);
x->x_last = 0.; /* CHECKED fires at startup */
x->x_zeroleft = x->x_zerohit = 0;
outlet_new((t_object *)x, &s_bang);
x->x_out2 = outlet_new((t_object *)x, &s_bang);
x->x_clock = clock_new(x, (t_method)edge_tick);
return (x);
}
void edge_tilde_setup(void)
{
edge_class = class_new(gensym("edge~"),
(t_newmethod)edge_new,
(t_method)edge_free,
sizeof(t_edge), 0,
A_DEFFLOAT, 0);
sic_setup(edge_class, edge_dsp, SIC_FLOATTOSIGNAL);
}
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