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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 _delta
{
t_sic x_sic;
t_float x_last;
} t_delta;
static t_class *delta_class;
static t_int *delta_perform(t_int *w)
{
t_delta *x = (t_delta *)(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;
last = f;
}
x->x_last = last;
return (w + 5);
}
static void delta_dsp(t_delta *x, t_signal **sp)
{
dsp_add(delta_perform, 4, x, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
}
static void *delta_new(void)
{
t_delta *x = (t_delta *)pd_new(delta_class);
outlet_new((t_object *)x, &s_signal);
x->x_last = 0;
return (x);
}
void delta_tilde_setup(void)
{
delta_class = class_new(gensym("delta~"),
(t_newmethod)delta_new, 0,
sizeof(t_delta), 0, 0);
sic_setup(delta_class, delta_dsp, SIC_FLOATTOSIGNAL);
}
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