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/* Copyright (c) 1997-2001 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
#include "d_math.h"
static float rsqrt_exptab[DUMTAB1SIZE], rsqrt_mantissatab[DUMTAB2SIZE];
typedef struct sigsqrt
{
t_object x_obj;
t_float x_f;
} t_sigsqrt;
static t_class *sigsqrt_class;
static void *sigsqrt_new(void)
{
t_sigsqrt *x = (t_sigsqrt *)pd_new(sigsqrt_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
t_int *sigsqrt_perform(t_int *w) /* not static; also used in d_fft.c */
{
t_sample *in = *(t_sample **)(w+1), *out = *(t_sample **)(w+2);
t_int n = *(t_int *)(w+3);
while (n--)
{
t_sample f = *in;
long l = *(long *)(in++);
if (f < 0) *out++ = 0;
else
{
t_sample g = rsqrt_exptab[(l >> 23) & 0xff] *
rsqrt_mantissatab[(l >> 13) & 0x3ff];
*out++ = f * (1.5 * g - 0.5 * g * g * g * f);
}
}
return (w + 4);
}
static void sigsqrt_dsp(t_sigsqrt *x, t_signal **sp)
{
dsp_add(sigsqrt_perform, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void sqrt_tilde_setup(void)
{
sigsqrt_class = class_new(gensym("sqrt~"), (t_newmethod)sigsqrt_new, 0,
sizeof(t_sigsqrt), 0, 0);
class_addcreator(sigsqrt_new, gensym("q8_sqrt~"), 0); /* old name */
CLASS_MAINSIGNALIN(sigsqrt_class, t_sigsqrt, x_f);
class_addmethod(sigsqrt_class, (t_method)sigsqrt_dsp, gensym("dsp"), 0);
}
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