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// GPL
// most of this code comes from pd. just the interpolation shematic is diferent.
#include "m_pd.h"
/******************** tabread4c~ ***********************/
static t_class *tabread4c_tilde_class;
typedef struct _tabread4c_tilde
{
t_object x_obj;
int x_npoints;
t_word *x_vec;
t_symbol *x_arrayname;
t_float x_f;
} t_tabread4c_tilde;
static void *tabread4c_tilde_new(t_symbol *s)
{
t_tabread4c_tilde *x = (t_tabread4c_tilde *)pd_new(tabread4c_tilde_class);
x->x_arrayname = s;
x->x_vec = 0;
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
static t_int *tabread4c_tilde_perform(t_int *w)
{
t_tabread4c_tilde *x = (t_tabread4c_tilde *)(w[1]);
t_sample *in = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
int n = (int)(w[4]);
int maxindex;
t_word *buf = x->x_vec, *wp;
int i;
double a0,a1,a2; // CH
maxindex = x->x_npoints - 3;
if (!buf) goto zero;
#if 0 /* test for spam -- I'm not ready to deal with this */
for (i = 0, xmax = 0, xmin = maxindex, fp = in1; i < n; i++, fp++)
{
t_sample f = *in1;
if (f < xmin) xmin = f;
else if (f > xmax) xmax = f;
}
if (xmax < xmin + x->c_maxextent) xmax = xmin + x->c_maxextent;
for (i = 0, splitlo = xmin+ x->c_maxextent, splithi = xmax - x->c_maxextent,
fp = in1; i < n; i++, fp++)
{
t_sample f = *in1;
if (f > splitlo && f < splithi) goto zero;
}
#endif
for (i = 0; i < n; i++)
{
t_sample findex = *in++;
int index = findex;
t_sample frac, a, b, c, d, cminusb;
static int count;
if (index < 1)
index = 1, frac = 0;
else if (index > maxindex)
index = maxindex, frac = 1;
else frac = findex - index;
wp = buf + index;
a = wp[-1].w_float;
b = wp[0].w_float;
c = wp[1].w_float;
d = wp[2].w_float;
/* if (!i && !(count++ & 1023))
post("fp = %lx, shit = %lx, b = %f", fp, buf->b_shit, b); */
// cminusb = c-b;
// *out++ = b + frac * (
// cminusb - 0.1666667f * (1.-frac) * (
// (d - a - 3.0f * cminusb) * frac + (d + 2.0f*a - 3.0f*b)
// CH
a0 = d - c - a + b;
a1 = a - b - a0;
a2 = c - a;
*out++ = ((a0*frac+a1)*frac+a2)*frac+b;
}
return (w+5);
zero:
while (n--) *out++ = 0;
return (w+5);
}
void tabread4c_tilde_set(t_tabread4c_tilde *x, t_symbol *s)
{
t_garray *a;
x->x_arrayname = s;
if (!(a = (t_garray *)pd_findbyclass(x->x_arrayname, garray_class)))
{
if (*s->s_name)
pd_error(x, "tabread4c~: %s: no such array", x->x_arrayname->s_name);
x->x_vec = 0;
}
else if (!garray_getfloatwords(a, &x->x_npoints, &x->x_vec))
{
pd_error(x, "%s: bad template for tabread4c~", x->x_arrayname->s_name);
x->x_vec = 0;
}
else garray_usedindsp(a);
}
static void tabread4c_tilde_dsp(t_tabread4c_tilde *x, t_signal **sp)
{
tabread4c_tilde_set(x, x->x_arrayname);
dsp_add(tabread4c_tilde_perform, 4, x,
sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void tabread4c_tilde_free(t_tabread4c_tilde *x)
{
}
void tabread4c_tilde_setup(void)
{
tabread4c_tilde_class = class_new(gensym("tabread4c~"),
(t_newmethod)tabread4c_tilde_new, (t_method)tabread4c_tilde_free,
sizeof(t_tabread4c_tilde), 0, A_DEFSYM, 0);
CLASS_MAINSIGNALIN(tabread4c_tilde_class, t_tabread4c_tilde, x_f);
class_addmethod(tabread4c_tilde_class, (t_method)tabread4c_tilde_dsp,
gensym("dsp"), 0);
class_addmethod(tabread4c_tilde_class, (t_method)tabread4c_tilde_set,
gensym("set"), A_SYMBOL, 0);
}
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