aboutsummaryrefslogtreecommitdiff
path: root/sc4pd/source/Integrator.cpp
blob: 85253ee525bbca47e12de9b92206d965d37b3428 (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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
/* sc4pd 
   Integrator~, Integrator

   Copyright (c) 2004 Tim Blechmann.                                       

   This code is derived from:
	SuperCollider real time audio synthesis system
    Copyright (c) 2002 James McCartney. All rights reserved.
	http://www.audiosynth.com


   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.
         http://www.crca.ucsd.edu/~msp/software.html
     FLEXT by Thomas Grill
         http://www.parasitaere-kapazitaeten.net/ext
     SuperCollider by James McCartney
         http://www.audiosynth.com
     
   Coded while listening to: AMM: AMMMusic 1966
   
*/

#include "sc4pd.hpp"

/* ------------------------ Integrator~ -----------------------------*/

class Integrator_ar
    :public sc4pd_dsp
{
    FLEXT_HEADER(Integrator_ar,sc4pd_dsp);

public:
    Integrator_ar(int argc,t_atom * argv);

protected:
    virtual void m_signal(int n, t_sample *const *in, t_sample *const *out);
    void m_set(float f);

private:
    FLEXT_CALLBACK_F(m_set);
    float m_b1;                       //leak
    float m_y1;                       //z-1
};

FLEXT_LIB_DSP_V("Integrator~",Integrator_ar);

Integrator_ar::Integrator_ar(int argc,t_atom * argv)
{
    FLEXT_ADDMETHOD_(0,"leak",m_set);

    AtomList Args(argc,argv);

    m_b1 = sc_getfloatarg(Args,0);

    AddOutSignal();

    m_y1 = 0.f;
}

void Integrator_ar::m_signal(int n, t_sample *const *in, 
				t_sample *const *out)
{
    t_sample *nout = *out;
    t_sample *nin = *in;

    float b1 = m_b1;
    float y1 = m_y1;

    if (b1 == m_b1) 
    {
	if (b1 == 1.f) 
	{
	    for (int i = 0; i!= n;++i)
	    {
		float y0 = (*(nin)++); 
		(*(nout)++) = y1 = y0 + y1;
	    }
	    
	} 
	else if (b1 == 0.f) 
	{
	    for (int i = 0; i!= n;++i)
	    {
		float y0 = (*(nin)++); 
		(*(nout)++) = y1 = y0;
	    }
	} 
	else 
	{
	    for (int i = 0; i!= n;++i)
	    {
		float y0 = (*(nin)++); 
		(*(nout)++) = y1 = y0 + b1 * y1;
	    }
	}
    } 
    else 
    {
	float b1_slope = CALCSLOPE(m_b1, b1);
	if (b1 >= 0.f && m_b1 >= 0) 
	{
	    for (int i = 0; i!= n;++i) 
	    {
		float y0 = (*(nin)++); 
		(*(nout)++) = y1 = y0 + b1 * (y1 - y0);
		b1 += b1_slope;
	    }
	} 
	else if (b1 <= 0.f && m_b1 <= 0) 
	{
	    for (int i = 0; i!= n;++i) 
	    {
		float y0 = (*(nin)++); 
		(*(nout)++) = y1 = y0 + b1 * (y1 + y0);
		b1 += b1_slope;
	    }
	} 
	else 
	{
	    for (int i = 0; i!= n;++i) 
	    {
		float y0 = (*(nin)++); 
		(*(nout)++) = y1 = (1.f - fabs(b1)) * y0 + b1 * y1;
		b1 += b1_slope;
	    }
	}
    }
    m_y1 = zapgremlins(y1);
}
    
void Integrator_ar::m_set(float f)
{
    m_b1=f;
}

/* ------------------------ Integrator ------------------------------*/

class Integrator_kr
    :public flext_base
{
    FLEXT_HEADER(Integrator_kr,flext_base);

public:
    Integrator_kr(int argc,t_atom * argv);

protected:
    void m_set(float f);
    void m_perform(float f);
    
private:
    float m_b1;                       //leak
    float m_y1;                       //z-1

    FLEXT_CALLBACK_F(m_set);
    FLEXT_CALLBACK_F(m_perform);
};

FLEXT_LIB_V("Integrator",Integrator_kr);

Integrator_kr::Integrator_kr(int argc,t_atom * argv)
{
    AtomList Args(argc,argv);

    m_b1 = sc_getfloatarg(Args,0);
    m_y1 = 0.f;

    
    AddInFloat();
    AddOutFloat();

    FLEXT_ADDMETHOD(0,m_perform);
    FLEXT_ADDMETHOD_(0,"leak",m_set);
}

void Integrator_kr::m_perform(float f)
{
    m_y1 = f + m_y1 * m_b1;
    ToOutFloat(0,m_y1);
}

void Integrator_kr::m_set(float f)
{
    m_b1=f;
}