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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.
iem_spec2 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2006 */
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
/* ------------------------ spec2_sqrt_tilde~ ------------------------- */
static t_class *spec2_sqrt_tilde_class;
#define SPEC2DUMTAB1SIZE 256
#define SPEC2DUMTAB2SIZE 1024
static t_float spec2_rsqrt_exptab[SPEC2DUMTAB1SIZE], spec2_rsqrt_mantissatab[SPEC2DUMTAB2SIZE];
static void init_spec2_rsqrt(void)
{
int i;
for (i=0; i<SPEC2DUMTAB1SIZE; i++)
{
t_float f;
long l = (i ? (i == SPEC2DUMTAB1SIZE-1 ? SPEC2DUMTAB1SIZE-2 : i) : 1)<< 23;
*(long *)(&f) = l;
spec2_rsqrt_exptab[i] = 1.0f/sqrt(f);
}
for (i=0; i<SPEC2DUMTAB2SIZE; i++)
{
t_float f = 1.0f + (1.0f / (t_float)SPEC2DUMTAB2SIZE) * (t_float)i;
spec2_rsqrt_mantissatab[i] = 1.0f / sqrt(f);
}
}
typedef struct _spec2_sqrt_tilde
{
t_object x_obj;
t_float x_msi;
} t_spec2_sqrt_tilde;
static t_int *spec2_sqrt_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = w[3]+1;
while(n--)
{
t_float f = *in;
long l = *(long *)(in++);
if(f < 0.0f)
*out++ = 0.0f;
else
{
t_float g = spec2_rsqrt_exptab[(l >> 23) & 0xff] * spec2_rsqrt_mantissatab[(l >> 13) & 0x3ff];
*out++ = f*g*(1.5f - 0.5f*g*g*f);
}
}
return(w+4);
}
static void spec2_sqrt_tilde_dsp(t_spec2_sqrt_tilde *x, t_signal **sp)
{
int n = (sp[0]->s_n)/2;
dsp_add(spec2_sqrt_tilde_perform, 3, sp[0]->s_vec, sp[0]->s_vec, n);
}
static void *spec2_sqrt_tilde_new(void)
{
t_spec2_sqrt_tilde *x = (t_spec2_sqrt_tilde *)pd_new(spec2_sqrt_tilde_class);
outlet_new(&x->x_obj, &s_signal);
x->x_msi = 0.0f;
return (x);
}
void spec2_sqrt_tilde_setup(void)
{
init_spec2_rsqrt();
spec2_sqrt_tilde_class = class_new(gensym("spec2_sqrt~"), (t_newmethod)spec2_sqrt_tilde_new,
0, sizeof(t_spec2_sqrt_tilde), 0, 0);
CLASS_MAINSIGNALIN(spec2_sqrt_tilde_class, t_spec2_sqrt_tilde, x_msi);
class_addmethod(spec2_sqrt_tilde_class, (t_method)spec2_sqrt_tilde_dsp, gensym("dsp"), 0);
// class_sethelpsymbol(spec2_sqrt_tilde_class, gensym("iemhelp2/spec2_sqrt~-help"));
}
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