149 lines
3.2 KiB
Text
149 lines
3.2 KiB
Text
/*
|
|
* This file is part of libsidplayfp, a SID player engine.
|
|
*
|
|
* Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
|
|
* Copyright 2007-2010 Antti Lankila
|
|
* Copyright 2004 Dag Lem <resid@nimrod.no>
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef FILTER_H
|
|
#define FILTER_H
|
|
|
|
namespace reSIDfp
|
|
{
|
|
|
|
/**
|
|
* SID filter base class
|
|
*/
|
|
class Filter
|
|
{
|
|
protected:
|
|
/// Filter cutoff frequency.
|
|
unsigned int fc;
|
|
|
|
/// Filter resonance.
|
|
unsigned char res;
|
|
|
|
/// Current volume.
|
|
unsigned char vol;
|
|
|
|
/// Routing to filter or outside filter
|
|
bool filt1, filt2, filt3, filtE;
|
|
|
|
/// Switch voice 3 off.
|
|
bool voice3off;
|
|
|
|
/// Highpass, bandpass, and lowpass filter modes.
|
|
bool hp, bp, lp;
|
|
|
|
private:
|
|
/// Filter enabled.
|
|
bool enabled;
|
|
|
|
/// Selects which inputs to route through filter.
|
|
unsigned char filt;
|
|
|
|
protected:
|
|
/**
|
|
* Set filter cutoff frequency.
|
|
*/
|
|
virtual void updatedCenterFrequency() = 0;
|
|
|
|
/**
|
|
* Set filter resonance.
|
|
*/
|
|
virtual void updatedResonance() = 0;
|
|
|
|
/**
|
|
* Mixing configuration modified (offsets change)
|
|
*/
|
|
virtual void updatedMixing() = 0;
|
|
|
|
public:
|
|
Filter() :
|
|
fc(0),
|
|
res(0),
|
|
vol(0),
|
|
filt1(false),
|
|
filt2(false),
|
|
filt3(false),
|
|
filtE(false),
|
|
voice3off(false),
|
|
hp(false),
|
|
bp(false),
|
|
lp(false),
|
|
enabled(true),
|
|
filt(0) {}
|
|
|
|
virtual ~Filter() {}
|
|
|
|
/**
|
|
* SID clocking - 1 cycle
|
|
*
|
|
* @param v1 voice 1 in
|
|
* @param v2 voice 2 in
|
|
* @param v3 voice 3 in
|
|
* @return filtered output
|
|
*/
|
|
virtual int clock(int v1, int v2, int v3) = 0;
|
|
|
|
/**
|
|
* Enable filter.
|
|
*
|
|
* @param enable
|
|
*/
|
|
void enable(bool enable);
|
|
|
|
/**
|
|
* SID reset.
|
|
*/
|
|
void reset();
|
|
|
|
/**
|
|
* Write Frequency Cutoff Low register.
|
|
*
|
|
* @param fc_lo Frequency Cutoff Low-Byte
|
|
*/
|
|
void writeFC_LO(unsigned char fc_lo);
|
|
|
|
/**
|
|
* Write Frequency Cutoff High register.
|
|
*
|
|
* @param fc_hi Frequency Cutoff High-Byte
|
|
*/
|
|
void writeFC_HI(unsigned char fc_hi);
|
|
|
|
/**
|
|
* Write Resonance/Filter register.
|
|
*
|
|
* @param res_filt Resonance/Filter
|
|
*/
|
|
void writeRES_FILT(unsigned char res_filt);
|
|
|
|
/**
|
|
* Write filter Mode/Volume register.
|
|
*
|
|
* @param mode_vol Filter Mode/Volume
|
|
*/
|
|
void writeMODE_VOL(unsigned char mode_vol);
|
|
|
|
virtual void input(int input) = 0;
|
|
};
|
|
|
|
} // namespace reSIDfp
|
|
|
|
#endif
|