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/* sIgpAck
* for
* pure-data
* www.weiss-archiv.de */
#include "m_pd.h"
#include <math.h>
#ifdef _MSC_VER
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
/* ------------------------ saturate~ ----------------------------- */
/* signal soft saturation */
/* code from www.musicdsp.org posted by bram de jong */
static t_class *saturate_tilde_class;
typedef struct _saturate_tilde
{
t_object x_obj;
t_sample x_thresh;
float x_f;
} t_saturate_tilde;
static void *saturate_tilde_new(t_floatarg thresh)
{
t_saturate_tilde *x = (t_saturate_tilde *)pd_new(saturate_tilde_class);
x->x_thresh = thresh;
outlet_new(&x->x_obj, gensym("signal"));
floatinlet_new(&x->x_obj, &x->x_thresh);
x->x_f = 0;
if(thresh) x->x_thresh = thresh;
else x->x_thresh = 1.;
return (x);
}
static float sigmoid(float x)
{
if(fabs(x) < 1)
return x * (1.5f - 0.5f * x * x);
else
return x > 0.f ? 1.f : -1.f;
}
static t_int *saturate_tilde_perform(t_int *w)
{
t_saturate_tilde *x = (t_saturate_tilde *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
float f, value;
float t = x->x_thresh;
while (n--)
{
f = *in++;
if(fabs(f) < t)
value = f;
else
{
if(f > 0.f)
value = t + (1.f - t) * sigmoid((f - t)/((1 - t) * 1.5f));
else
value = -(t + (1.f - t) * sigmoid((-f - t)/((1 - t) * 1.5f)));
}
*out++ = value;
}
return (w+5);
}
static void saturate_tilde_dsp(t_saturate_tilde *x, t_signal **sp)
{
dsp_add(saturate_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void saturate_tilde_setup(void)
{
saturate_tilde_class = class_new(gensym("saturate~"), (t_newmethod)saturate_tilde_new, 0,
sizeof(t_saturate_tilde), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(saturate_tilde_class, t_saturate_tilde, x_f);
class_addmethod(saturate_tilde_class, (t_method)saturate_tilde_dsp, gensym("dsp"), 0);
class_addmethod(saturate_tilde_class, (t_method)saturate_tilde_dsp, gensym("sigmoid"), A_FLOAT, 0);
}
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