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Innovation SSI-2001 emulation. Using ReSID-FP.

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TomW 2014-05-11 14:09:13 +01:00
commit 2ff2210b3b
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src/resid-fp/voice.cc Normal file
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// ---------------------------------------------------------------------------
// This file is part of reSID, a MOS6581 SID emulator engine.
// Copyright (C) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// ---------------------------------------------------------------------------
#define __VOICE_CC__
#include "voice.h"
#include "sid.h"
// ----------------------------------------------------------------------------
// Constructor.
// ----------------------------------------------------------------------------
VoiceFP::VoiceFP()
{
nonlinearity = 1.f;
set_chip_model(MOS6581FP);
}
/* Keep this at 1.f for 8580, there are no 6581-only codepaths in this file! */
void VoiceFP::set_nonlinearity(float nl)
{
nonlinearity = nl;
calculate_dac_tables();
}
// ----------------------------------------------------------------------------
// Set chip model.
// ----------------------------------------------------------------------------
void VoiceFP::set_chip_model(chip_model model)
{
wave.set_chip_model(model);
if (model == MOS6581FP) {
/* there is some level from each voice even if the env is down and osc
* is stopped. You can hear this by routing a voice into filter (filter
* should be kept disabled for this) as the master level changes. This
* tunable affects the volume of digis. */
voice_DC = 0x800 * 0xff;
/* In 8580 the waveforms seem well centered, but on the 6581 there is some
* offset change as envelope grows, indicating that the waveforms are not
* perfectly centered. I estimate the value ~ 0x600 for my R4AR, and ReSID
* has used another measurement technique and got 0x380. */
wave_zero = 0x600;
calculate_dac_tables();
}
else {
/* 8580 is thought to be perfect, apart from small negative offset due to
* ext-in mixing, I think. */
voice_DC = 0;
wave_zero = 0x800;
calculate_dac_tables();
}
}
void VoiceFP::calculate_dac_tables()
{
int i;
for (i = 0; i < 256; i ++)
env_dac[i] = SIDFP::kinked_dac(i, nonlinearity, 8);
for (i = 0; i < 4096; i ++)
voice_dac[i] = SIDFP::kinked_dac(i, nonlinearity, 12) - wave_zero;
}
// ----------------------------------------------------------------------------
// Set sync source.
// ----------------------------------------------------------------------------
void VoiceFP::set_sync_source(VoiceFP* source)
{
wave.set_sync_source(&source->wave);
}
// ----------------------------------------------------------------------------
// Register functions.
// ----------------------------------------------------------------------------
void VoiceFP::writeCONTROL_REG(reg8 control)
{
wave.writeCONTROL_REG(control);
envelope.writeCONTROL_REG(control);
}
// ----------------------------------------------------------------------------
// SID reset.
// ----------------------------------------------------------------------------
void VoiceFP::reset()
{
wave.reset();
envelope.reset();
}