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#include "m_pd.h"
#include <math.h>
#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
/* ------------------------ delta~ ----------------------------- */
/* tilde object to take difference value. */
static t_class *delta_class;
typedef struct _delta
{
t_object x_obj;
t_sample x_last;
} t_delta;
static t_int *delta_perform(t_int *w)
{
t_delta *x = (t_delta *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
while (n--)
{
float f = *(in++);
// *out++ = (f > 0 ? f : -f);
*out++ = (f > x->x_last ? fabs(f - x->x_last) : -fabs(f - x->x_last));
x->x_last = f;
}
return (w+5);
}
static void delta_dsp(t_delta *x, t_signal **sp)
{
dsp_add(delta_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void *delta_new(void)
{
t_delta *x = (t_delta *)pd_new(delta_class);
x->x_last = 0.;
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
void delta_tilde_setup(void)
{
delta_class = class_new(gensym("delta~"), (t_newmethod)delta_new, 0,
sizeof(t_delta), 0, A_DEFFLOAT, 0);
class_addmethod(delta_class, nullfn, gensym("signal"), 0);
class_addmethod(delta_class, (t_method)delta_dsp, gensym("dsp"), 0);
class_sethelpsymbol(delta_class, gensym("delta.pd"));
}
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