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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 _change
{
t_sic x_sic;
t_float x_last;
} t_change;
static t_class *change_class;
static t_int *change_perform(t_int *w)
{
t_change *x = (t_change *)(w[1]);
int nblock = (int)(w[2]);
t_float *in = (t_float *)(w[3]);
t_float *out = (t_float *)(w[4]);
t_float last = x->x_last;
while (nblock--)
{
t_float f = *in++;
*out++ = (f > last ? 1. : (f < last ? -1. : 0.));
last = f;
}
x->x_last = last;
return (w + 5);
}
static void change_dsp(t_change *x, t_signal **sp)
{
dsp_add(change_perform, 4, x, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
}
static void *change_new(void)
{
t_change *x = (t_change *)pd_new(change_class);
outlet_new((t_object *)x, &s_signal);
x->x_last = 0; /* CHECKME startup conditions */
return (x);
}
void change_tilde_setup(void)
{
change_class = class_new(gensym("change~"),
(t_newmethod)change_new, 0,
sizeof(t_change), 0, 0);
sic_setup(change_class, change_dsp, SIC_FLOATTOSIGNAL);
}
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