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// sigpack
// for
// pure-data
// by weiss
// www.weiss-archiv.de
#include "m_pd.h"
#include <math.h>
#ifdef _MSC_VER
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
// ------------------------ shape~ -----------------------------
// this external reshapes the wave by an exponential function, inspiration was taken from the Nord module of the same name.
// code from swh_plugins by steve harris www.plugin.org.uk
static t_class *shape_tilde_class;
typedef struct _shape_tilde
{
t_object x_obj;
t_sample x_shapep;
t_float x_f;
} t_shape_tilde;
static void *shape_tilde_new(t_floatarg waveshape)
{
t_shape_tilde *x = (t_shape_tilde *)pd_new(shape_tilde_class);
x->x_shapep = waveshape;
outlet_new(&x->x_obj, gensym("signal"));
floatinlet_new(&x->x_obj, &x->x_shapep);
x->x_f = 0;
if (waveshape) x->x_shapep = waveshape;
else x->x_shapep = 0.0f;
return (x);
}
static t_int *shape_tilde_perform(t_int *w)
{
t_shape_tilde *x = (t_shape_tilde *)(w[1]);
t_sample *in = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
int n = (int)(w[4]);
t_float f, value;
t_float shape = 0.0f;
if (x->x_shapep < 1.0f && x->x_shapep < -1.0f) {
shape = 1.0f;
} else if (shape < 0) {
shape = -1.0f / shape;
} else {
shape = x->x_shapep;
}
while (n--)
{
f = *in++;
if (f < 0.0f) {
value = -pow(-f, shape);
} else {
value = pow(f, shape);
}
*out++ = value;
}
return (w+5);
}
static void shape_tilde_dsp(t_shape_tilde *x, t_signal **sp)
{
dsp_add(shape_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void shape_tilde_setup(void)
{
shape_tilde_class = class_new(gensym("shape~"), (t_newmethod)shape_tilde_new, 0,
sizeof(t_shape_tilde), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(shape_tilde_class, t_shape_tilde, x_f);
class_addmethod(shape_tilde_class, (t_method)shape_tilde_dsp, gensym("dsp"), 0);
}
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