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/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
iemlib2 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
/* ------------------------- fade~ ----------------------------- */
/* --- signal lookup tabel object with input range of 0 to 1 --- */
/* ---- converts a linear signal ramp to the half of a : ------ */
/* -- sine-wave, hanning-wave, squareroot-wave or mixes of it -- */
t_float *iem_fade_tilde_table_lin=(t_float *)0L;
t_float *iem_fade_tilde_table_linsqrt=(t_float *)0L;
t_float *iem_fade_tilde_table_sqrt=(t_float *)0L;
t_float *iem_fade_tilde_table_sin=(t_float *)0L;
t_float *iem_fade_tilde_table_sinhann=(t_float *)0L;
t_float *iem_fade_tilde_table_hann=(t_float *)0L;
static t_class *fade_tilde_class;
typedef struct _fade_tilde
{
t_object x_obj;
t_float *x_table;
t_float x_f;
} t_fade_tilde;
static void fade_tilde_set(t_fade_tilde *x, t_symbol *s)
{
if(s == gensym("_lin"))
x->x_table = iem_fade_tilde_table_lin;
else if(s == gensym("_linsqrt"))
x->x_table = iem_fade_tilde_table_linsqrt;
else if(s == gensym("_sqrt"))
x->x_table = iem_fade_tilde_table_sqrt;
else if(s == gensym("_sin"))
x->x_table = iem_fade_tilde_table_sin;
else if(s == gensym("_sinhann"))
x->x_table = iem_fade_tilde_table_sinhann;
else if(s == gensym("_hann"))
x->x_table = iem_fade_tilde_table_hann;
}
static void *fade_tilde_new(t_symbol *s)
{
t_fade_tilde *x = (t_fade_tilde *)pd_new(fade_tilde_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
x->x_table = iem_fade_tilde_table_lin;
fade_tilde_set(x, s);
return (x);
}
static t_int *fade_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_fade_tilde *x = (t_fade_tilde *)(w[3]);
int n = (int)(w[4]);
t_float *tab = x->x_table, *addr, f1, f2, frac;
double dphase;
int normhipart;
union tabfudge tf;
tf.tf_d = UNITBIT32;
normhipart = tf.tf_i[HIOFFSET];
#if 0 /* this is the readable version of the code. */
while (n--)
{
dphase = (double)(*in++ * (t_float)(COSTABSIZE) * 0.99999) + UNITBIT32;
tf.tf_d = dphase;
addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
tf.tf_i[HIOFFSET] = normhipart;
frac = tf.tf_d - UNITBIT32;
f1 = addr[0];
f2 = addr[1];
*out++ = f1 + frac * (f2 - f1);
}
#endif
#if 1 /* this is the same, unwrapped by hand. */
dphase = (double)(*in++ * (t_float)(COSTABSIZE) * 0.99999) + UNITBIT32;
tf.tf_d = dphase;
addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
tf.tf_i[HIOFFSET] = normhipart;
while (--n)
{
dphase = (double)(*in++ * (t_float)(COSTABSIZE) * 0.99999) + UNITBIT32;
frac = tf.tf_d - UNITBIT32;
tf.tf_d = dphase;
f1 = addr[0];
f2 = addr[1];
addr = tab + (tf.tf_i[HIOFFSET] & (COSTABSIZE-1));
*out++ = f1 + frac * (f2 - f1);
tf.tf_i[HIOFFSET] = normhipart;
}
frac = tf.tf_d - UNITBIT32;
f1 = addr[0];
f2 = addr[1];
*out++ = f1 + frac * (f2 - f1);
#endif
return (w+5);
}
static void fade_tilde_dsp(t_fade_tilde *x, t_signal **sp)
{
dsp_add(fade_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}
static void fade_tilde_maketable(void)
{
int i;
t_float *fp, phase, fff,phsinc = 0.5*3.141592653 / ((t_float)COSTABSIZE*0.99999);
union tabfudge tf;
if(!iem_fade_tilde_table_sin)
{
iem_fade_tilde_table_sin = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_fade_tilde_table_sin, phase=0; i--; fp++, phase+=phsinc)
*fp = sin(phase);
}
if(!iem_fade_tilde_table_sinhann)
{
iem_fade_tilde_table_sinhann = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_fade_tilde_table_sinhann, phase=0; i--; fp++, phase+=phsinc)
{
fff = sin(phase);
*fp = fff*sqrt(fff);
}
}
if(!iem_fade_tilde_table_hann)
{
iem_fade_tilde_table_hann = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_fade_tilde_table_hann, phase=0; i--; fp++, phase+=phsinc)
{
fff = sin(phase);
*fp = fff*fff;
}
}
phsinc = 1.0 / ((t_float)COSTABSIZE*0.99999);
if(!iem_fade_tilde_table_lin)
{
iem_fade_tilde_table_lin = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_fade_tilde_table_lin, phase=0; i--; fp++, phase+=phsinc)
*fp = phase;
}
if(!iem_fade_tilde_table_linsqrt)
{
iem_fade_tilde_table_linsqrt = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_fade_tilde_table_linsqrt, phase=0; i--; fp++, phase+=phsinc)
*fp = pow(phase, 0.75);
}
if(!iem_fade_tilde_table_sqrt)
{
iem_fade_tilde_table_sqrt = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_fade_tilde_table_sqrt, phase=0; i--; fp++, phase+=phsinc)
*fp = sqrt(phase);
}
tf.tf_d = UNITBIT32 + 0.5;
if((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000)
bug("fade~: unexpected machine alignment");
}
void fade_tilde_setup(void)
{
fade_tilde_class = class_new(gensym("fade~"), (t_newmethod)fade_tilde_new, 0,
sizeof(t_fade_tilde), 0, A_DEFSYM, 0);
CLASS_MAINSIGNALIN(fade_tilde_class, t_fade_tilde, x_f);
class_addmethod(fade_tilde_class, (t_method)fade_tilde_dsp, gensym("dsp"), 0);
class_addmethod(fade_tilde_class, (t_method)fade_tilde_set, gensym("set"), A_DEFSYM, 0);
class_sethelpsymbol(fade_tilde_class, gensym("iemhelp/help-fade~"));
fade_tilde_maketable();
}
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