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/*
* abs.c - computes absolute value of a signal
* Copyright (c) 2000-2003 by Tom Schouten
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "m_pd.h"
#include <math.h>
/* ------------------------- abs~ -------------------------- */
static t_class *abs_class;
typedef struct _abs
{
t_object x_obj;
} t_abs;
static t_int *abs_perform(t_int *w)
{
t_abs *x = (t_abs *)(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++;
if (f < 0) f = -f;
*out++ = f;
}
return (w+5);
}
static void abs_dsp(t_abs *x, t_signal **sp)
{
dsp_add(abs_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void *abs_new(void)
{
t_abs *x = (t_abs *)pd_new(abs_class);
outlet_new(&x->x_obj, &s_signal);
return (x);
}
void abs_tilde_setup(void)
{
abs_class = class_new(gensym("abs~"), (t_newmethod)abs_new, 0,
sizeof(t_abs), 0, A_NULL);
class_addmethod(abs_class, (t_method)nullfn, &s_signal, A_NULL);
class_addmethod(abs_class, (t_method)abs_dsp, gensym("dsp"), A_NULL);
}
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