libsidplayfp  1.8.7
Filter.h
1 /*
2  * This file is part of libsidplayfp, a SID player engine.
3  *
4  * Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
5  * Copyright 2007-2010 Antti Lankila
6  * Copyright 2004 Dag Lem <resid@nimrod.no>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef FILTER_H
24 #define FILTER_H
25 
26 namespace reSIDfp
27 {
28 
32 class Filter
33 {
34 protected:
36  unsigned int fc;
37 
39  unsigned char res;
40 
42  unsigned char vol;
43 
45  bool filt1, filt2, filt3, filtE;
46 
48  bool voice3off;
49 
51  bool hp, bp, lp;
52 
53 private:
55  bool enabled;
56 
58  unsigned char filt;
59 
60 protected:
64  virtual void updatedCenterFrequency() = 0;
65 
69  virtual void updatedResonance() = 0;
70 
74  virtual void updatedMixing() = 0;
75 
76 public:
77  Filter() :
78  fc(0),
79  res(0),
80  vol(0),
81  filt1(false),
82  filt2(false),
83  filt3(false),
84  filtE(false),
85  voice3off(false),
86  hp(false),
87  bp(false),
88  lp(false),
89  enabled(true),
90  filt(0) {}
91 
92  virtual ~Filter() {}
93 
102  virtual int clock(int v1, int v2, int v3) = 0;
103 
109  void enable(bool enable);
110 
114  void reset();
115 
121  void writeFC_LO(unsigned char fc_lo);
122 
128  void writeFC_HI(unsigned char fc_hi);
129 
135  void writeRES_FILT(unsigned char res_filt);
136 
142  void writeMODE_VOL(unsigned char mode_vol);
143 
144  virtual void input(int input) = 0;
145 };
146 
147 } // namespace reSIDfp
148 
149 #endif
virtual void updatedMixing()=0
bool hp
Highpass, bandpass, and lowpass filter modes.
Definition: Filter.h:51
unsigned char vol
Current volume.
Definition: Filter.h:42
bool filt1
Routing to filter or outside filter.
Definition: Filter.h:45
Definition: Dac.cpp:25
virtual void updatedCenterFrequency()=0
void writeMODE_VOL(unsigned char mode_vol)
Definition: Filter.cpp:80
bool voice3off
Switch voice 3 off.
Definition: Filter.h:48
virtual int clock(int v1, int v2, int v3)=0
void writeRES_FILT(unsigned char res_filt)
Definition: Filter.cpp:62
unsigned char res
Filter resonance.
Definition: Filter.h:39
void reset()
Definition: Filter.cpp:42
void writeFC_HI(unsigned char fc_hi)
Definition: Filter.cpp:56
void writeFC_LO(unsigned char fc_lo)
Definition: Filter.cpp:50
void enable(bool enable)
Definition: Filter.cpp:28
Definition: Filter.h:32
unsigned int fc
Filter cutoff frequency.
Definition: Filter.h:36
virtual void updatedResonance()=0