aboutsummaryrefslogtreecommitdiff
path: root/filters/moog~.c
blob: 924ff31f031537d0beac751ea619851ef19474f0 (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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/* (C) Guenter Geiger <geiger@epy.co.at> */


#include "math.h"
#include <m_pd.h>

/* ----------------------------- moog ----------------------------- */
static t_class *moog_class;


typedef struct _moog
{
     t_object x_obj;
  t_pd   in2;
     t_float x_1,x_2,x_3,x_4;
     t_float y_1,y_2,y_3,y_4;
} t_moog;

static void moog_reset(t_moog *x)
{
	x->x_1 = x->x_2 = x->x_3 = x->x_4 = 0.0;
	x->y_1 = x->y_2 = x->y_3 = x->y_4 = 0.0;

}



static void *moog_new(t_symbol *s, int argc, t_atom *argv)
{
    if (argc > 1) post("moog~: extra arguments ignored");
    {
	t_moog *x = (t_moog *)pd_new(moog_class);
	outlet_new(&x->x_obj, &s_signal);
	inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
	inlet_new(&x->x_obj, &x->in2, &s_signal, &s_signal);
	moog_reset(x);
	return (x);
    }


}



static t_float calc_k(t_float f,t_float k) {
  if (k>4.) k =4.;
  if (k < 0.) k = 0.;
  if (f <= 3800) return k;
  k = k - 0.5*((f-3800)/4300);
  return k;
}

t_int *moog_perform(t_int *w)
{
    t_moog* x = (t_moog*) (w[1]); 
    t_float *in1 = (t_float *)(w[2]);
    t_float *p = (t_float *)(w[3]);
    t_float *k = (t_float *)(w[4]);

    t_float *out = (t_float *)(w[5]);
    int n = (int)(w[6]);
    float in;
    float pt,pt1;
    
    float x1 = x->x_1;
    float x2 = x->x_2;
    float x3 = x->x_3;
    float x4 = x->x_4;
    float y1 = x->y_1;
    float y2 = x->y_2;
    float y3 = x->y_3;
    float y4 = x->y_4;


   while (n--) {
     if (*p > 8140) *p = 8140.;
     *k = calc_k(*p,*k);
     pt =*p;
     pt1=(pt+1)*0.76923077;
     in = *in1++ - *k*y4;
     y1 = (pt1)*in + 0.3*x1 - pt*y1;
     x1 = in;
     y2 = (pt1)*y1 + 0.3*x2 - pt*y2;
     x2 = y1;
     y3 = (pt1)*y2 + 0.3 *x3 - pt*y3;
     x3 = y2;
     y4 = (pt1)*y3 + 0.3*x4 - pt*y4;
     x4 = y3;
     *out++ = y4;
   }

   
    x->y_1 = y1;
    x->y_2 = y2;
    x->y_3 = y3;
    x->y_4 = y4;
    x->x_1 = x1;
    x->x_2 = x2;
    x->x_3 = x3;
    x->x_4 = x4;

    return (w+7);
}


#define CLIP(x)  x = ((x) > 1.0 ? (1.0) : (x))

t_int *moog_perf8(t_int *w)
{
    t_moog* x = (t_moog*) (w[1]); 
    t_float *in1 = (t_float *)(w[2]);
    t_float *p = (t_float *)(w[3]);
    t_float *k = (t_float *)(w[4]);
    t_float *out = (t_float *)(w[5]);
    int n = (int)(w[6]);

    t_float x1 = x->x_1;
    t_float x2 = x->x_2;
    t_float x3 = x->x_3;
    t_float x4 = x->x_4;
    t_float y1 = x->y_1;
    t_float y2 = x->y_2;
    t_float y3 = x->y_3;
    t_float y4 = x->y_4;
    t_float temp,temp2;
    t_float pt,pt1;
    t_float in;

    while (n--) {
      if (*p > 8140.) *p = 8140.;
      *k = calc_k(*p,*k);

     pt =*p* 0.01*0.0140845 - 0.9999999f;
     pt1=(pt+1.0)*0.76923077;
     in = *in1++ - *k*y4;
     y1 = pt1*(in + 0.3*x1) - pt*y1;
     x1 = in;
     y2 = pt1*(y1 + 0.3*x2) - pt*y2;
     x2 = y1;
     y3 = pt1*(y2 + 0.3*x3) - pt*y3;
     x3 = y2;
     y4 = pt1*(y3 + 0.3*x4) - pt*y4;
     x4 = y3;
     *out++ = y4;

      p++;k++;
    }

    x->y_1 = y1;
    x->y_2 = y2;
    x->y_3 = y3;
    x->y_4 = y4;
    x->x_1 = x1;
    x->x_2 = x2;
    x->x_3 = x3;
    x->x_4 = x4;
    
    return (w+7);
}

void dsp_add_moog(t_moog *x, t_sample *in1, t_sample *in2, t_sample *in3, t_sample *out, int n)
{
    if (n&7)
    	dsp_add(moog_perform, 6,(t_int)x, in1,in2,in3, out, n);
    else	
    	dsp_add(moog_perf8, 6,(t_int) x, in1, in2, in3, out, n);
}

static void moog_dsp(t_moog *x, t_signal **sp)
{
    dsp_add_moog(x,sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec,sp[0]->s_n);
}


void moog_tilde_setup(void)
{
    moog_class = class_new(gensym("moog~"), (t_newmethod)moog_new, 0,
    	sizeof(t_moog), 0, A_GIMME, 0);
    class_addmethod(moog_class, nullfn, gensym("signal"), 0);
    class_addmethod(moog_class, (t_method)moog_reset, gensym("reset"), 0);
    class_addmethod(moog_class, (t_method)moog_dsp, gensym("dsp"), A_NULL);
}