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/*
* statwav.c - static wavetable oscillator (scale + tabread)
*
* Copyright (c) 2000-2003 by Tom Schouten
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "m_pd.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static t_class *statwav_tilde_class;
typedef struct _statwav_tilde
{
t_object x_obj;
int x_npoints;
float *x_vec;
t_symbol *x_arrayname;
float x_f;
} t_statwav_tilde;
static void *statwav_tilde_new(t_symbol *s)
{
t_statwav_tilde *x = (t_statwav_tilde *)pd_new(statwav_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 *statwav_tilde_perform(t_int *w)
{
t_statwav_tilde *x = (t_statwav_tilde *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
float maxindex;
int imaxindex;
float *buf = x->x_vec, *fp;
int i;
maxindex = x->x_npoints;
imaxindex = x->x_npoints;
if (!buf) goto zero;
for (i = 0; i < n; i++)
{
float phase = *in++;
float modphase = phase - (int)phase;
float findex;
int index;
int ia, ib, ic, id;
float frac, a, b, c, d, cminusb;
static int count;
if (modphase < 0.0f) modphase += 1.0f;
findex = modphase * maxindex;
index = findex;
frac = findex - index;
ia = (imaxindex+index-1) % imaxindex;
ib = index;
ic = (index+1) % imaxindex;
id = (index+2) % imaxindex;
a = buf[ia];
b = buf[ib];
c = buf[ic];
d = buf[id];
/* if (!i && !(count++ & 1023))
post("fp = %lx, shit = %lx, b = %f", fp, buf->b_shit, b); */
cminusb = c-b;
*out++ = b + frac * (
cminusb - 0.5f * (frac-1.) * (
(a - d + 3.0f * cminusb) * frac + (b - a - cminusb)
)
);
}
return (w+5);
zero:
while (n--) *out++ = 0;
return (w+5);
}
static void statwav_tilde_set(t_statwav_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)
error("statwav~: %s: no such array", x->x_arrayname->s_name);
x->x_vec = 0;
}
else if (!garray_getfloatarray(a, &x->x_npoints, &x->x_vec))
{
error("%s: bad template for statwav~", x->x_arrayname->s_name);
x->x_vec = 0;
}
else garray_usedindsp(a);
}
static void statwav_tilde_dsp(t_statwav_tilde *x, t_signal **sp)
{
statwav_tilde_set(x, x->x_arrayname);
dsp_add(statwav_tilde_perform, 4, x,
sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void statwav_tilde_free(t_statwav_tilde *x)
{
}
void statwav_tilde_setup(void)
{
//post("statwav~ v0.1");
statwav_tilde_class = class_new(gensym("statwav~"),
(t_newmethod)statwav_tilde_new, (t_method)statwav_tilde_free,
sizeof(t_statwav_tilde), 0, A_DEFSYM, 0);
CLASS_MAINSIGNALIN(statwav_tilde_class, t_statwav_tilde, x_f);
class_addmethod(statwav_tilde_class, (t_method)statwav_tilde_dsp,
gensym("dsp"), 0);
class_addmethod(statwav_tilde_class, (t_method)statwav_tilde_set,
gensym("set"), A_SYMBOL, 0);
}
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