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#include "m_pd.h"
/* ------------------------ lrshift~ ----------------------------- */
static t_class *lrshift_tilde_class;
typedef struct _lrshift_tilde
{
t_object x_obj;
int x_n;
} t_lrshift_tilde;
static t_int *leftshift_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out= (t_float *)(w[2]);
int n = (int)(w[3]);
int shift = (int)(w[4]);
in += shift;
n -= shift;
while (n--)
*out++ = *in++;
while (shift--)
*out++ = 0;
return (w+5);
}
static t_int *rightshift_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out= (t_float *)(w[2]);
int n = (int)(w[3]);
int shift = (int)(w[4]);
n -= shift;
in -= shift;
while (n--)
*--out = *--in;
while (shift--)
*--out = 0;
return (w+5);
}
static void lrshift_tilde_dsp(t_lrshift_tilde *x, t_signal **sp)
{
int n = sp[0]->s_n;
int shift = x->x_n;
if (shift > n)
shift = n;
if (shift < -n)
shift = -n;
if (shift < 0)
dsp_add(rightshift_perform, 4,
sp[0]->s_vec + n, sp[1]->s_vec + n, n, -shift);
else dsp_add(leftshift_perform, 4,
sp[0]->s_vec, sp[1]->s_vec, n, shift);
}
static void *lrshift_tilde_new(t_floatarg f)
{
t_lrshift_tilde *x = (t_lrshift_tilde *)pd_new(lrshift_tilde_class);
x->x_n = f;
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
void lrshift_tilde_setup(void)
{
lrshift_tilde_class = class_new(gensym("lrshift~"),
(t_newmethod)lrshift_tilde_new, 0, sizeof(t_lrshift_tilde), 0,
A_DEFFLOAT, 0);
class_addmethod(lrshift_tilde_class, nullfn, gensym("signal"), 0);
class_addmethod(lrshift_tilde_class, (t_method)lrshift_tilde_dsp,
gensym("dsp"), 0);
}
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