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/* Copyright (c) 1997-2001 Miller Puckette 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 <math.h>
static t_class *log_tilde_class;
typedef struct _log_tilde
{
t_object x_obj;
t_float x_f;
} t_log_tilde;
static void *log_tilde_new(t_symbol *s, int argc, t_atom *argv)
{
t_log_tilde *x = (t_log_tilde *)pd_new(log_tilde_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
outlet_new(&x->x_obj, &s_signal);
x->x_f = 0;
return (x);
}
t_int *log_tilde_perform(t_int *w)
{
t_sample *in1 = (t_sample *)(w[1]);
t_sample *in2 = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
int n = (int)(w[4]);
while (n--)
{
float f = *in1++, g = *in2++;
if (f <= 0)
*out = -1000; /* rather than blow up, output a number << 0 */
else if (g <= 0)
*out = log(f);
else *out = log(f)/log(g);
out++;
}
return (w+5);
}
static void log_tilde_dsp(t_log_tilde *x, t_signal **sp)
{
dsp_add(log_tilde_perform, 4,
sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n);
}
void log_tilde_setup(void)
{
log_tilde_class = class_new(gensym("log~"), (t_newmethod)log_tilde_new, 0,
sizeof(t_log_tilde), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(log_tilde_class, t_log_tilde, x_f);
class_addmethod(log_tilde_class, (t_method)log_tilde_dsp, gensym("dsp"), 0);
}
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