aboutsummaryrefslogtreecommitdiff
path: root/src/rewrap.c
blob: e02f2398a62e2d2fec709055e33f4d98b78ae48c (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
/* -------------------------  rewrap  ------------------------------------------ */
/*                                                                              */
/* rewraps input to lie within an output range.                                  */
/* Written by Olaf Matthes <olaf.matthes@gmx.de>                                */
/* Get source at http://www.akustische-kunst.org/puredata/maxlib/               */
/*                                                                              */
/* 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.  */
/*                                                                              */
/* Based on PureData by Miller Puckette and others.                             */
/*                                                                              */
/* ---------------------------------------------------------------------------- */

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

static char *version = "rewrap v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
 
typedef struct rewrap
{
  t_object x_ob;
  t_float  x_min;                  /* low border of input range */
  t_float  x_max;                  /* high border of input range */
  t_outlet *x_outlet1;             /* path-through outlet */
  t_outlet *x_outlet2;             /* rewrap outlet */
} t_rewrap;

static void rewrap_float(t_rewrap *x, t_floatarg f)
{
  t_float min = x->x_min;
  t_float max = x->x_max;
  t_float range = 2.0f * (max - min);
  t_int i;

  if(range == 0.0f)
    {
      f = min;
      outlet_float(x->x_outlet2, 0);
    }
  else if(f < min)
    {
      float diff = min - f;
      float n = ceil(diff / range);

      f += n * range;

      if(f >= max)
	{
	  f = 2 * max - f;
	  n -= 0.5;
	}

      outlet_float(x->x_outlet2, (t_int)(-2.0f * n));
    }
  else if (f >= max)
    {
      float diff = f - max;
      float n = floor(diff / range) + 1.0f;

      f -= n * range;

      if(f < min)
	{
	  f = 2 * min - f;
	  n -= 0.5;
	}

      outlet_float(x->x_outlet2, (t_int)(2.0f * n));
    }
  else
    outlet_float(x->x_outlet2, 0.0f);
    

  outlet_float(x->x_outlet1, f);
}

static void rewrap_a(t_rewrap *x, t_floatarg a)
{
	t_float max = x->x_max;

	if(a <= max)
		x->x_min = a;
	else
	{
		x->x_min = max;
		x->x_max = a;
	}
}

static void rewrap_b(t_rewrap *x, t_floatarg b)
{
	t_float min = x->x_min;

	if(b >= min)
		x->x_max = b;
	else
	{
		x->x_max = min;
		x->x_min = b;
	}
}

static t_class *rewrap_class;

static void *rewrap_new(t_floatarg fmin, t_floatarg fmax)
{
    t_rewrap *x = (t_rewrap *)pd_new(rewrap_class);

    inlet_new(&x->x_ob, &x->x_ob.ob_pd, gensym("float"), gensym("a"));
    inlet_new(&x->x_ob, &x->x_ob.ob_pd, gensym("float"), gensym("b"));

	x->x_outlet1 = outlet_new(&x->x_ob, gensym("float"));
	x->x_outlet2 = outlet_new(&x->x_ob, gensym("float"));

	x->x_min = fmin;
	rewrap_b(x, fmax);

    return (void *)x;
}

#ifndef MAXLIB
void rewrap_setup(void)
{
    rewrap_class = class_new(gensym("rewrap"), (t_newmethod)rewrap_new,
    	0, sizeof(t_rewrap), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
    class_addfloat(rewrap_class, rewrap_float);
	class_addmethod(rewrap_class, (t_method)rewrap_a, gensym("a"), A_FLOAT, 0);
	class_addmethod(rewrap_class, (t_method)rewrap_b, gensym("b"), A_FLOAT, 0);
    class_sethelpsymbol(rewrap_class, gensym("help-rewrap.pd"));
    post(version);
}
#else
void maxlib_rewrap_setup(void)
{
    rewrap_class = class_new(gensym("maxlib_rewrap"), (t_newmethod)rewrap_new,
    	0, sizeof(t_rewrap), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
	class_addcreator((t_newmethod)rewrap_new, gensym("rewrap"), A_DEFFLOAT, A_DEFFLOAT, 0);
    class_addfloat(rewrap_class, rewrap_float);
	class_addmethod(rewrap_class, (t_method)rewrap_a, gensym("a"), A_FLOAT, 0);
	class_addmethod(rewrap_class, (t_method)rewrap_b, gensym("b"), A_FLOAT, 0);
    class_sethelpsymbol(rewrap_class, gensym("maxlib/help-rewrap.pd"));
}
#endif