91 lines
2.1 KiB
Text
91 lines
2.1 KiB
Text
/*
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* This file is part of libsidplayfp, a SID player engine.
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*
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* Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
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* Copyright 2007-2010 Antti Lankila
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* Copyright 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "Filter.h"
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namespace reSIDfp
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{
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void Filter::enable(bool enable)
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{
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enabled = enable;
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if (enabled)
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{
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writeRES_FILT(filt);
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}
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else
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{
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filt1 = filt2 = filt3 = filtE = false;
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}
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}
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void Filter::reset()
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{
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writeFC_LO(0);
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writeFC_HI(0);
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writeMODE_VOL(0);
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writeRES_FILT(0);
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}
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void Filter::writeFC_LO(unsigned char fc_lo)
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{
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fc = (fc & 0x7f8) | (fc_lo & 0x007);
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updatedCenterFrequency();
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}
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void Filter::writeFC_HI(unsigned char fc_hi)
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{
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fc = (fc_hi << 3 & 0x7f8) | (fc & 0x007);
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updatedCenterFrequency();
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}
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void Filter::writeRES_FILT(unsigned char res_filt)
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{
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filt = res_filt;
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res = res_filt >> 4 & 0x0f;
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updatedResonance();
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if (enabled)
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{
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filt1 = (filt & 0x01) != 0;
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filt2 = (filt & 0x02) != 0;
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filt3 = (filt & 0x04) != 0;
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filtE = (filt & 0x08) != 0;
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}
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updatedMixing();
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}
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void Filter::writeMODE_VOL(unsigned char mode_vol)
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{
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vol = mode_vol & 0x0f;
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lp = (mode_vol & 0x10) != 0;
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bp = (mode_vol & 0x20) != 0;
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hp = (mode_vol & 0x40) != 0;
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voice3off = (mode_vol & 0x80) != 0;
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updatedMixing();
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}
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} // namespace reSIDfp
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