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
|
/* Copyright (c) 2002-2003 krzYszcz and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* CHECKME polarity */
#include <math.h>
#include "m_pd.h"
#if defined(NT) || defined(MACOSX)
#define logf log
#define expf exp
#endif
static t_class *linedrive_class;
typedef struct _linedrive
{
t_object x_ob;
t_float x_maxin;
t_float x_maxout;
t_float x_expcoef;
t_float x_lincoef;
t_atom x_vec[2];
int x_linear;
} t_linedrive;
static void linedrive_float(t_linedrive *x, t_floatarg f)
{
float outval = f - x->x_maxin;
if (outval >= 0)
outval = x->x_maxout; /* CHECKED */
else if (x->x_linear)
outval = x->x_maxout + outval * x->x_lincoef;
else
outval = expf(outval * x->x_expcoef) * x->x_maxout;
SETFLOAT(x->x_vec, outval);
outlet_list(((t_object *)x)->ob_outlet, 0, 2, x->x_vec);
}
static void *linedrive_new(t_floatarg maxin, t_floatarg maxout,
t_floatarg curve, t_floatarg deltime)
{
t_linedrive *x = (t_linedrive *)pd_new(linedrive_class);
x->x_maxin = (maxin < 1.0e-20f && maxin > -1e-20f ? 0 : maxin);
x->x_maxout = maxout;
if (curve < 1.0e-20f) curve = 1.0; /* a bug in msp? */
if (curve == 1.0)
{
x->x_expcoef = 0;
x->x_lincoef = (x->x_maxin == 0 ? 0 : x->x_maxout / x->x_maxin);
x->x_linear = 1;
}
else {
x->x_expcoef = logf(curve);
x->x_lincoef = 0;
x->x_linear = 0;
}
SETFLOAT(&x->x_vec[1], deltime); /* CHECKED: any value accepted */
floatinlet_new((t_object *)x, &x->x_vec[1].a_w.w_float);
outlet_new((t_object *)x, &s_list);
return (x);
}
void linedrive_setup(void)
{
linedrive_class = class_new(gensym("linedrive"),
(t_newmethod)linedrive_new, 0,
sizeof(t_linedrive), 0,
A_DEFFLOAT, A_DEFFLOAT,
A_DEFFLOAT, A_DEFFLOAT, 0);
class_addfloat(linedrive_class, linedrive_float);
}
|
