145 lines
3.9 KiB
Plaintext
145 lines
3.9 KiB
Plaintext
/*
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* This file is part of libsidplayfp, a SID player engine.
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*
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* Copyright 2011-2014 Leandro Nini <drfiemost@users.sourceforge.net>
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* Copyright 2007-2010 Antti Lankila
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* Copyright 2004,2010 Dag Lem
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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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#ifndef FILTERMODELCONFIG_H
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#define FILTERMODELCONFIG_H
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#include <memory>
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#include "Spline.h"
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namespace reSIDfp
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{
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class Integrator;
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/**
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* Calculate parameters for 6581 filter emulation.
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*/
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class FilterModelConfig
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{
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private:
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static const unsigned int DAC_BITS = 11;
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private:
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static std::auto_ptr<FilterModelConfig> instance;
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// This allows access to the private constructor
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friend class std::auto_ptr<FilterModelConfig>;
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const double voice_voltage_range;
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const double voice_DC_voltage;
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/// Capacitor value.
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const double C;
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/// Transistor parameters.
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//@{
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const double Vdd;
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const double Vth; ///< Threshold voltage
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const double Ut; ///< Thermal voltage: Ut = k*T/q = 8.61734315e-5*T ~ 26mV
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const double k; ///< Gate coupling coefficient: K = Cox/(Cox+Cdep) ~ 0.7
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const double uCox; ///< u*Cox
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const double WL_vcr; ///< W/L for VCR
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const double WL_snake; ///< W/L for "snake"
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const double kVddt; ///< k * (Vdd - Vth)
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//@}
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/// DAC parameters.
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//@{
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const double dac_zero;
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const double dac_scale;
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//@}
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// Derived stuff
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const double vmin, vmax;
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const double denorm, norm;
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/// Fixed point scaling for 16 bit op-amp output.
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const double N16;
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/// Lookup tables for gain and summer op-amps in output stage / filter.
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//@{
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unsigned short* mixer[8];
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unsigned short* summer[5];
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unsigned short* gain[16];
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//@}
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/// DAC lookup table
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double dac[DAC_BITS];
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/// VCR - 6581 only.
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//@{
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unsigned short vcr_kVg[1 << 16];
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unsigned short vcr_n_Ids_term[1 << 16];
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//@}
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/// Reverse op-amp transfer function.
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unsigned short opamp_rev[1 << 16];
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private:
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double getDacZero(double adjustment) const { return dac_zero - (adjustment - 0.5) * 2.; }
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FilterModelConfig();
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~FilterModelConfig();
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public:
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static FilterModelConfig* getInstance();
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/**
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* The digital range of one voice is 20 bits; create a scaling term
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* for multiplication which fits in 11 bits.
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*/
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int getVoiceScaleS14() const { return static_cast<int>((norm * ((1 << 14) - 1)) * voice_voltage_range); }
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/**
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* The "zero" output level of the voices.
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*/
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int getVoiceDC() const { return static_cast<int>(N16 * (voice_DC_voltage - vmin)); }
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unsigned short** getGain() { return gain; }
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unsigned short** getSummer() { return summer; }
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unsigned short** getMixer() { return mixer; }
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/**
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* Construct an 11 bit cutoff frequency DAC output voltage table.
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* Ownership is transferred to the requester which becomes responsible
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* of freeing the object when done.
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*
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* @param adjustment
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* @return the DAC table
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*/
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unsigned short* getDAC(double adjustment) const;
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/**
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* Construct an integrator solver.
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*
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* @return the integrator
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*/
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std::auto_ptr<Integrator> buildIntegrator();
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};
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} // namespace reSIDfp
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#endif
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