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ExternalFilter.h
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/*
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* This file is part of reSID, a MOS6581 SID emulator engine.
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* Copyright (C) 2004 Dag Lem <resid@nimrod.no>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* @author Ken Händel
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*
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*/
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#ifndef EXTERNALFILTER_H
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#define EXTERNALFILTER_H
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#include "siddefs-fp.h"
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namespace
reSIDfp
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{
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class
ExternalFilter
{
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private
:
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int
Vlp;
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int
Vhp;
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int
w0lp_1_s7;
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int
w0hp_1_s19;
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public
:
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int
clock
(
const
int
Vi);
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ExternalFilter
();
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void
setClockFrequency
(
const
double
frequency);
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void
reset
();
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};
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}
// namespace reSIDfp
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#if RESID_INLINING || defined(EXTERNALFILTER_CPP)
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namespace
reSIDfp
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{
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RESID_INLINE
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int
ExternalFilter::clock
(
const
int
Vi) {
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const
int
dVlp = (w0lp_1_s7*((Vi << 11) - Vlp) >> 7);
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const
int
dVhp = (w0hp_1_s19*(Vlp - Vhp) >> 19);
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Vlp += dVlp;
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Vhp += dVhp;
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return
(Vlp - Vhp) >> 11;
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}
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}
// namespace reSIDfp
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#endif
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#endif
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