103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
// ---------------------------------------------------------------------------
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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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#define __VOICE_CC__
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#include "voice.h"
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#include "sid.h"
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// ----------------------------------------------------------------------------
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// Constructor.
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// ----------------------------------------------------------------------------
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VoiceFP::VoiceFP()
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{
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nonlinearity = 1.f;
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set_chip_model(MOS6581FP);
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}
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/* Keep this at 1.f for 8580, there are no 6581-only codepaths in this file! */
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void VoiceFP::set_nonlinearity(float nl)
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{
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nonlinearity = nl;
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calculate_dac_tables();
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}
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// ----------------------------------------------------------------------------
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// Set chip model.
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// ----------------------------------------------------------------------------
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void VoiceFP::set_chip_model(chip_model model)
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{
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wave.set_chip_model(model);
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if (model == MOS6581FP) {
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/* there is some level from each voice even if the env is down and osc
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* is stopped. You can hear this by routing a voice into filter (filter
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* should be kept disabled for this) as the master level changes. This
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* tunable affects the volume of digis. */
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voice_DC = 0x800 * 0xff;
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/* In 8580 the waveforms seem well centered, but on the 6581 there is some
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* offset change as envelope grows, indicating that the waveforms are not
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* perfectly centered. I estimate the value ~ 0x600 for my R4AR, and ReSID
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* has used another measurement technique and got 0x380. */
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wave_zero = 0x600;
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calculate_dac_tables();
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}
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else {
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/* 8580 is thought to be perfect, apart from small negative offset due to
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* ext-in mixing, I think. */
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voice_DC = 0;
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wave_zero = 0x800;
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calculate_dac_tables();
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}
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}
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void VoiceFP::calculate_dac_tables()
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{
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int i;
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for (i = 0; i < 256; i ++)
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env_dac[i] = SIDFP::kinked_dac(i, nonlinearity, 8);
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for (i = 0; i < 4096; i ++)
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voice_dac[i] = SIDFP::kinked_dac(i, nonlinearity, 12) - wave_zero;
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}
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// ----------------------------------------------------------------------------
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// Set sync source.
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// ----------------------------------------------------------------------------
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void VoiceFP::set_sync_source(VoiceFP* source)
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{
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wave.set_sync_source(&source->wave);
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}
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// ----------------------------------------------------------------------------
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// Register functions.
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// ----------------------------------------------------------------------------
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void VoiceFP::writeCONTROL_REG(reg8 control)
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{
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wave.writeCONTROL_REG(control);
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envelope.writeCONTROL_REG(control);
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}
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// ----------------------------------------------------------------------------
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// SID reset.
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// ----------------------------------------------------------------------------
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void VoiceFP::reset()
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{
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wave.reset();
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envelope.reset();
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}
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