rockbox/apps/plugins/pdbox/PDa/intern/cos~.c

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#include <m_pd.h>
#include <m_fixed.h>
#include "cos_table.h"
/* ------------------------ cos~ ----------------------------- */
#define FRAC ((1<<(fix1-ILOGCOSTABSIZE))-1)
static t_class *cos_class;
typedef struct _cos
{
t_object x_obj;
float x_f;
} t_cos;
static void *cos_new(void)
{
t_cos *x = (t_cos *)pd_new(cos_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
static t_int *cos_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
int n = (int)(w[3]);
t_sample *tab = cos_table;
int off;
int frac;
unsigned int phase;
while (n--) {
phase = *in++;
phase &= ((1<<fix1)-1);
off = fixtoi((long long)phase<<ILOGCOSTABSIZE);
frac = phase&(itofix(1)-1);
*out = mult(*(tab + off),itofix(1) - frac) +
mult(*(tab + off + 1),frac);
out++;
}
return (w+4);
}
static void cos_dsp(t_cos *x, t_signal **sp)
{
dsp_add(cos_perform, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void cos_tilde_setup(void)
{
cos_class = class_new(gensym("cos~"), (t_newmethod)cos_new, 0,
sizeof(t_cos), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(cos_class, t_cos, x_f);
class_addmethod(cos_class, (t_method)cos_dsp, gensym("dsp"), 0);
class_sethelpsymbol(cos_class, gensym("osc~-help.pd"));
}