aboutsummaryrefslogtreecommitdiff
path: root/modules/statwav~.c
blob: 4fd2765c1358b142c692ed3c766a600539521705 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
/*
 *   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);
}