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/* Copyright (c) 2002-2003 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 "m_pd.h"
#include "sickle/sic.h"
#define RAMPSMOOTH_GEOMETRIC /* geometric series (same as slide~) CHECKED */
#ifndef RAMPSMOOTH_GEOMETRIC
#define RAMPSMOOTH_LINEAR
#endif
#define RAMPSMOOTH_DEFNUP 0.
#define RAMPSMOOTH_DEFNDOWN 0.
typedef struct _rampsmooth
{
t_sic x_sic;
int x_nup;
int x_ndown;
double x_upcoef;
double x_downcoef;
t_float x_last;
#ifdef RAMPSMOOTH_LINEAR
t_float x_target;
double x_incr;
int x_nleft;
#endif
} t_rampsmooth;
static t_class *rampsmooth_class;
#ifdef RAMPSMOOTH_LINEAR
/* this is a true linear ramper */
static t_int *rampsmooth_perform(t_int *w)
{
t_rampsmooth *x = (t_rampsmooth *)(w[1]);
int nblock = (int)(w[2]);
t_float *in = (t_float *)(w[3]);
t_float *out = (t_float *)(w[4]);
t_float last = x->x_last;
t_float target = x->x_target;
double incr = x->x_incr;
int nleft = x->x_nleft;
while (nblock--)
{
t_float f = *in++;
if (f != target)
{
target = f;
if (f > last)
{
if (x->x_nup > 1)
{
incr = (f - last) * x->x_upcoef;
nleft = x->x_nup;
*out++ = (last += incr);
continue;
}
}
else if (f < last)
{
if (x->x_ndown > 1)
{
incr = (f - last) * x->x_downcoef;
nleft = x->x_ndown;
*out++ = (last += incr);
continue;
}
}
incr = 0.;
nleft = 0;
*out++ = last = f;
}
else if (nleft > 0)
{
*out++ = (last += incr);
if (--nleft == 0)
{
incr = 0.;
last = target;
}
}
else *out++ = target;
}
x->x_last = last;
x->x_target = target;
x->x_incr = incr;
x->x_nleft = nleft;
return (w + 5);
}
#else
/* this ramper generates a geometric series output for a single step input */
static t_int *rampsmooth_perform(t_int *w)
{
t_rampsmooth *x = (t_rampsmooth *)(w[1]);
int nblock = (int)(w[2]);
t_float *in = (t_float *)(w[3]);
t_float *out = (t_float *)(w[4]);
t_float last = x->x_last;
while (nblock--)
{
t_float f = *in++;
if (f > last)
{
if (x->x_nup > 1)
{
*out++ = (last += (f - last) * x->x_upcoef);
continue;
}
}
else if (f < last)
{
if (x->x_ndown > 1)
{
*out++ = (last += (f - last) * x->x_downcoef);
continue;
}
}
*out++ = last = f;
}
x->x_last = last;
return (w + 5);
}
#endif
static void rampsmooth_dsp(t_rampsmooth *x, t_signal **sp)
{
dsp_add(rampsmooth_perform, 4, x, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
}
static void rampsmooth_rampup(t_rampsmooth *x, t_floatarg f)
{
int i = (int)f;
if (i > 1) /* CHECKME if 1 and 0 differ in any way */
{
x->x_nup = i;
x->x_upcoef = 1. / (float)i;
}
else
{
x->x_nup = 0;
x->x_upcoef = 0.;
}
}
static void rampsmooth_rampdown(t_rampsmooth *x, t_floatarg f)
{
int i = (int)f;
if (i > 1) /* CHECKME if 1 and 0 differ in any way */
{
x->x_ndown = i;
x->x_downcoef = 1. / (float)i;
}
else
{
x->x_ndown = 0;
x->x_downcoef = 0.;
}
}
/* CHECKED */
static void rampsmooth_ramp(t_rampsmooth *x, t_floatarg f)
{
rampsmooth_rampup(x, f);
rampsmooth_rampdown(x, f);
}
static void *rampsmooth_new(t_symbol *s, int ac, t_atom *av)
{
t_rampsmooth *x = (t_rampsmooth *)pd_new(rampsmooth_class);
float f1 = RAMPSMOOTH_DEFNUP;
float f2 = RAMPSMOOTH_DEFNDOWN;
if (ac && av->a_type == A_FLOAT)
{
f1 = av->a_w.w_float;
ac--; av++;
if (ac && av->a_type == A_FLOAT)
f2 = av->a_w.w_float;
}
rampsmooth_rampup(x, f1);
rampsmooth_rampdown(x, f2);
x->x_last = 0.;
#ifdef RAMPSMOOTH_LINEAR
x->x_target = 0.;
x->x_incr = 0.;
x->x_nleft = 0;
#endif
outlet_new((t_object *)x, &s_signal);
return (x);
}
void rampsmooth_tilde_setup(void)
{
rampsmooth_class = class_new(gensym("rampsmooth~"),
(t_newmethod)rampsmooth_new, 0,
sizeof(t_rampsmooth), 0, A_GIMME, 0);
sic_setup(rampsmooth_class, rampsmooth_dsp, SIC_FLOATTOSIGNAL);
class_addmethod(rampsmooth_class, (t_method)rampsmooth_rampup,
gensym("rampup"), A_FLOAT, 0);
class_addmethod(rampsmooth_class, (t_method)rampsmooth_rampdown,
gensym("rampdown"), A_FLOAT, 0);
class_addmethod(rampsmooth_class, (t_method)rampsmooth_ramp,
gensym("ramp"), A_FLOAT, 0);
}
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