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/* Copyright (c) 2005 krzYszcz and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
#include <math.h>
#include "m_pd.h"
#include "sickle/sic.h"
/* FIXME this is unnecessary in vc > 6.0 and darwin? */
#if defined(MSW) || defined(MACOSX)
#define powf pow
#endif
typedef struct _overdrive
{
t_sic x_sic;
float x_drivefactor;
} t_overdrive;
static t_class *overdrive_class;
/* CHECKED this is redundant (a design flaw), LATER fitter-optionally use
float-to-signal conversion. */
static void overdrive_float(t_overdrive *x, t_float f)
{
x->x_drivefactor = f;
}
static void overdrive_ft1(t_overdrive *x, t_floatarg f)
{
x->x_drivefactor = f;
}
/* CHECKED negative parameter values may cause output to go out of bounds */
static t_int *overdrive_perform(t_int *w)
{
float df = *(t_float *)(w[1]);
int nblock = (int)(w[2]);
t_float *in = (t_float *)(w[3]);
t_float *out = (t_float *)(w[4]);
while (nblock--)
{
float f = *in++;
if (f >= 1.) /* CHECKED incompatible (garbage for sig~ 1.) */
*out++ = 1.; /* CHECKED constant for > 1. */
else if (f > 0.)
*out++ = 1. - powf(1. - f, df); /* CHECKED */
else if (f > -1.) /* CHECKED incompatible (garbage for sig~ -1.) */
*out++ = powf(1. + f, df) - 1.; /* CHECKED */
else
*out++ = -1.; /* CHECKED constant for < -1. */
}
return (w + 5);
}
static void overdrive_dsp(t_overdrive *x, t_signal **sp)
{
dsp_add(overdrive_perform, 4, &x->x_drivefactor,
sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
}
static void *overdrive_new(t_floatarg f)
{
t_overdrive *x = (t_overdrive *)pd_new(overdrive_class);
x->x_drivefactor = f;
inlet_new((t_object *)x, (t_pd *)x, &s_float, gensym("ft1"));
outlet_new((t_object *)x, &s_signal);
return (x);
}
void overdrive_tilde_setup(void)
{
overdrive_class = class_new(gensym("overdrive~"),
(t_newmethod)overdrive_new, 0,
sizeof(t_overdrive), 0, A_DEFFLOAT, 0);
/* CHECKED no float-to-signal conversion */
sic_setup(overdrive_class, overdrive_dsp, overdrive_float);
class_addmethod(overdrive_class, (t_method)overdrive_ft1,
gensym("ft1"), A_FLOAT, 0);
}
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