mirror of https://github.com/ZDoom/gzdoom.git
1876 lines
60 KiB
C++
1876 lines
60 KiB
C++
/*
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* File: OPL3.java
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* Software implementation of the Yamaha YMF262 sound generator.
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* Copyright (C) 2008 Robson Cozendey <robson@cozendey.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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* One of the objectives of this emulator is to stimulate further research in the
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* OPL3 chip emulation. There was an explicit effort in making no optimizations,
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* and making the code as legible as possible, so that a new programmer
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* interested in modify and improve upon it could do so more easily.
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* This emulator's main body of information was taken from reverse engineering of
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* the OPL3 chip, from the YMF262 Datasheet and from the OPL3 section in the
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* YMF278b Application's Manual,
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* together with the vibrato table information, eighth waveform parameter
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* information and feedback averaging information provided in MAME's YMF262 and
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* YM3812 emulators, by Jarek Burczynski and Tatsuyuki Satoh.
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* This emulator has a high degree of accuracy, and most of music files sound
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* almost identical, exception made in some games which uses specific parts of
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* the rhythm section. In this respect, some parts of the rhythm mode are still
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* only an approximation of the real chip.
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* The other thing to note is that this emulator was done through recordings of
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* the SB16 DAC, so it has not bitwise precision. Additional equipment should be
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* used to verify the samples directly from the chip, and allow this exact
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* per-sample correspondence. As a good side-effect, since this emulator uses
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* floating point and has a more fine-grained envelope generator, it can produce
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* sometimes a crystal-clear, denser kind of OPL3 sound that, because of that,
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* may be useful for creating new music.
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*
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* Version 1.0.6
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*
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*/
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits>
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#include "opl.h"
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#include "opl3_Float.h"
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#define VOLUME_MUL 0.3333
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static const double OPL_PI = 3.14159265358979323846; // matches value in gcc v2 math.h
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namespace JavaOPL3
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{
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class Operator;
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static inline double StripIntPart(double num)
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{
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#if 0
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double dontcare;
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return modf(num, &dontcare);
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#else
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return num - xs_RoundToInt(num);
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#endif
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}
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//
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// Channels
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//
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class Channel
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{
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protected:
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double feedback[2];
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int fnuml, fnumh, kon, block, fb, cha, chb, cnt;
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// Factor to convert between normalized amplitude to normalized
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// radians. The amplitude maximum is equivalent to 8*Pi radians.
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#define toPhase (4.f)
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public:
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int channelBaseAddress;
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double leftPan, rightPan;
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Channel (int baseAddress, double startvol);
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virtual ~Channel() {}
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void update_2_KON1_BLOCK3_FNUMH2(class OPL3 *OPL3);
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void update_FNUML8(class OPL3 *OPL3);
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void update_CHD1_CHC1_CHB1_CHA1_FB3_CNT1(class OPL3 *OPL3);
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void updateChannel(class OPL3 *OPL3);
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void updatePan(class OPL3 *OPL3);
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virtual double getChannelOutput(class OPL3 *OPL3) = 0;
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virtual void keyOn() = 0;
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virtual void keyOff() = 0;
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virtual void updateOperators(class OPL3 *OPL3) = 0;
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};
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class Channel2op : public Channel
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{
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public:
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Operator *op1, *op2;
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Channel2op (int baseAddress, double startvol, Operator *o1, Operator *o2);
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double getChannelOutput(class OPL3 *OPL3);
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void keyOn();
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void keyOff();
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void updateOperators(class OPL3 *OPL3);
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};
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class Channel4op : public Channel
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{
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public:
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Operator *op1, *op2, *op3, *op4;
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Channel4op (int baseAddress, double startvol, Operator *o1, Operator *o2, Operator *o3, Operator *o4);
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double getChannelOutput(class OPL3 *OPL3);
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void keyOn();
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void keyOff();
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void updateOperators(class OPL3 *OPL3);
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};
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// There's just one instance of this class, that fills the eventual gaps in the Channel array;
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class DisabledChannel : public Channel
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{
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public:
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DisabledChannel() : Channel(0, 0) { }
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double getChannelOutput(class OPL3 *OPL3) { return 0; }
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void keyOn() { }
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void keyOff() { }
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void updateOperators(class OPL3 *OPL3) { }
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};
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//
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// Envelope Generator
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//
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class EnvelopeGenerator
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{
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public:
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enum Stage {ATTACK,DECAY,SUSTAIN,RELEASE,OFF};
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Stage stage;
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int actualAttackRate, actualDecayRate, actualReleaseRate;
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double xAttackIncrement, xMinimumInAttack;
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double dBdecayIncrement;
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double dBreleaseIncrement;
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double attenuation, totalLevel, sustainLevel;
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double x, envelope;
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public:
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EnvelopeGenerator();
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void setActualSustainLevel(int sl);
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void setTotalLevel(int tl);
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void setAtennuation(int f_number, int block, int ksl);
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void setActualAttackRate(int attackRate, int ksr, int keyScaleNumber);
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void setActualDecayRate(int decayRate, int ksr, int keyScaleNumber);
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void setActualReleaseRate(int releaseRate, int ksr, int keyScaleNumber);
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private:
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int calculateActualRate(int rate, int ksr, int keyScaleNumber);
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public:
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double getEnvelope(OPL3 *OPL3, int egt, int am);
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void keyOn();
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void keyOff();
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private:
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static double dBtoX(double dB);
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static double percentageToDB(double percentage);
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static double percentageToX(double percentage);
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};
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//
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// Phase Generator
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//
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class PhaseGenerator {
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double phase, phaseIncrement;
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public:
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PhaseGenerator();
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void setFrequency(int f_number, int block, int mult);
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double getPhase(class OPL3 *OPL3, int vib);
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void keyOn();
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};
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//
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// Operators
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//
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class Operator
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{
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public:
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PhaseGenerator phaseGenerator;
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EnvelopeGenerator envelopeGenerator;
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double envelope, phase;
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int operatorBaseAddress;
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int am, vib, ksr, egt, mult, ksl, tl, ar, dr, sl, rr, ws;
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int keyScaleNumber, f_number, block;
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static const double noModulator;
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public:
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Operator(int baseAddress);
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void update_AM1_VIB1_EGT1_KSR1_MULT4(class OPL3 *OPL3);
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void update_KSL2_TL6(class OPL3 *OPL3);
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void update_AR4_DR4(class OPL3 *OPL3);
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void update_SL4_RR4(class OPL3 *OPL3);
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void update_5_WS3(class OPL3 *OPL3);
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double getOperatorOutput(class OPL3 *OPL3, double modulator);
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void keyOn();
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void keyOff();
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void updateOperator(class OPL3 *OPL3, int ksn, int f_num, int blk);
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protected:
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double getOutput(double modulator, double outputPhase, double *waveform);
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};
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//
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// Rhythm
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//
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// The getOperatorOutput() method in TopCymbalOperator, HighHatOperator and SnareDrumOperator
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// were made through purely empyrical reverse engineering of the OPL3 output.
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class RhythmChannel : public Channel2op
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{
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public:
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RhythmChannel(int baseAddress, double startvol, Operator *o1, Operator *o2)
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: Channel2op(baseAddress, startvol, o1, o2)
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{ }
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double getChannelOutput(class OPL3 *OPL3);
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// Rhythm channels are always running,
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// only the envelope is activated by the user.
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void keyOn() { }
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void keyOff() { }
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};
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class HighHatSnareDrumChannel : public RhythmChannel {
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static const int highHatSnareDrumChannelBaseAddress = 7;
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public:
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HighHatSnareDrumChannel(double startvol, Operator *o1, Operator *o2)
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: RhythmChannel(highHatSnareDrumChannelBaseAddress, startvol, o1, o2)
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{ }
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};
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class TomTomTopCymbalChannel : public RhythmChannel {
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static const int tomTomTopCymbalChannelBaseAddress = 8;
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public:
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TomTomTopCymbalChannel(double startvol, Operator *o1, Operator *o2)
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: RhythmChannel(tomTomTopCymbalChannelBaseAddress, startvol, o1, o2)
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{ }
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};
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class TopCymbalOperator : public Operator {
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static const int topCymbalOperatorBaseAddress = 0x15;
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public:
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TopCymbalOperator(int baseAddress);
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TopCymbalOperator();
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double getOperatorOutput(class OPL3 *OPL3, double modulator);
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double getOperatorOutput(class OPL3 *OPL3, double modulator, double externalPhase);
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};
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class HighHatOperator : public TopCymbalOperator {
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static const int highHatOperatorBaseAddress = 0x11;
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public:
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HighHatOperator();
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double getOperatorOutput(class OPL3 *OPL3, double modulator);
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};
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class SnareDrumOperator : public Operator {
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static const int snareDrumOperatorBaseAddress = 0x14;
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public:
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SnareDrumOperator();
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double getOperatorOutput(class OPL3 *OPL3, double modulator);
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};
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class TomTomOperator : public Operator {
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static const int tomTomOperatorBaseAddress = 0x12;
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public:
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TomTomOperator() : Operator(tomTomOperatorBaseAddress) { }
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};
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class BassDrumChannel : public Channel2op {
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static const int bassDrumChannelBaseAddress = 6;
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static const int op1BaseAddress = 0x10;
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static const int op2BaseAddress = 0x13;
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Operator my_op1, my_op2;
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public:
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BassDrumChannel(double startvol);
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double getChannelOutput(class OPL3 *OPL3);
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// Key ON and OFF are unused in rhythm channels.
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void keyOn() { }
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void keyOff() { }
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};
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//
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// OPl3 Data
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//
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struct OPL3DataStruct
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{
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public:
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// OPL3-wide registers offsets:
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static const int
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_1_NTS1_6_Offset = 0x08,
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DAM1_DVB1_RYT1_BD1_SD1_TOM1_TC1_HH1_Offset = 0xBD,
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_7_NEW1_Offset = 0x105,
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_2_CONNECTIONSEL6_Offset = 0x104;
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// The OPL3 tremolo repetition rate is 3.7 Hz.
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#define tremoloFrequency (3.7)
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static const int tremoloTableLength = (int)(OPL_SAMPLE_RATE/tremoloFrequency);
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static const int vibratoTableLength = 8192;
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OPL3DataStruct()
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{
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loadVibratoTable();
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loadTremoloTable();
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}
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// The first array is used when DVB=0 and the second array is used when DVB=1.
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double vibratoTable[2][vibratoTableLength];
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// First array used when AM = 0 and second array used when AM = 1.
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double tremoloTable[2][tremoloTableLength];
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static double calculateIncrement(double begin, double end, double period) {
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return (end-begin)/OPL_SAMPLE_RATE * (1/period);
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}
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private:
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void loadVibratoTable();
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void loadTremoloTable();
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};
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//
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// Channel Data
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//
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struct ChannelData
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{
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static const int
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_2_KON1_BLOCK3_FNUMH2_Offset = 0xB0,
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FNUML8_Offset = 0xA0,
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CHD1_CHC1_CHB1_CHA1_FB3_CNT1_Offset = 0xC0;
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// Feedback rate in fractions of 2*Pi, normalized to (0,1):
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// 0, Pi/16, Pi/8, Pi/4, Pi/2, Pi, 2*Pi, 4*Pi turns to be:
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static const float feedback[8];
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};
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const float ChannelData::feedback[8] = {0,1/32.f,1/16.f,1/8.f,1/4.f,1/2.f,1,2};
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//
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// Operator Data
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//
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struct OperatorDataStruct
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{
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static const int
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AM1_VIB1_EGT1_KSR1_MULT4_Offset = 0x20,
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KSL2_TL6_Offset = 0x40,
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AR4_DR4_Offset = 0x60,
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SL4_RR4_Offset = 0x80,
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_5_WS3_Offset = 0xE0;
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enum type {NO_MODULATION, CARRIER, FEEDBACK};
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static const int waveLength = 1024;
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static const float multTable[16];
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static const float ksl3dBtable[16][8];
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//OPL3 has eight waveforms:
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double waveforms[8][waveLength];
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#define MIN_DB (-120.0)
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#define DB_TABLE_RES (4.0)
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#define DB_TABLE_SIZE (int)(-MIN_DB * DB_TABLE_RES)
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double dbpow[DB_TABLE_SIZE];
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#define ATTACK_MIN (-5.0)
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#define ATTACK_MAX (8.0)
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#define ATTACK_RES (0.03125)
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#define ATTACK_TABLE_SIZE (int)((ATTACK_MAX - ATTACK_MIN) / ATTACK_RES)
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double attackTable[ATTACK_TABLE_SIZE];
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OperatorDataStruct()
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{
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loadWaveforms();
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loaddBPowTable();
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loadAttackTable();
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}
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static double log2(double x) {
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return log(x)/log(2.0);
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}
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private:
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void loadWaveforms();
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void loaddBPowTable();
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void loadAttackTable();
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};
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const float OperatorDataStruct::multTable[16] = {0.5,1,2,3,4,5,6,7,8,9,10,10,12,12,15,15};
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const float OperatorDataStruct::ksl3dBtable[16][8] = {
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{0,0,0,0,0,0,0,0},
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{0,0,0,0,0,-3,-6,-9},
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{0,0,0,0,-3,-6,-9,-12},
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{0,0,0, -1.875, -4.875, -7.875, -10.875, -13.875},
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{0,0,0,-3,-6,-9,-12,-15},
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{0,0, -1.125, -4.125, -7.125, -10.125, -13.125, -16.125},
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{0,0, -1.875, -4.875, -7.875, -10.875, -13.875, -16.875},
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{0,0, -2.625, -5.625, -8.625, -11.625, -14.625, -17.625},
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{0,0,-3,-6,-9,-12,-15,-18},
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{0, -0.750, -3.750, -6.750, -9.750, -12.750, -15.750, -18.750},
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{0, -1.125, -4.125, -7.125, -10.125, -13.125, -16.125, -19.125},
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{0, -1.500, -4.500, -7.500, -10.500, -13.500, -16.500, -19.500},
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{0, -1.875, -4.875, -7.875, -10.875, -13.875, -16.875, -19.875},
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{0, -2.250, -5.250, -8.250, -11.250, -14.250, -17.250, -20.250},
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{0, -2.625, -5.625, -8.625, -11.625, -14.625, -17.625, -20.625},
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{0,-3,-6,-9,-12,-15,-18,-21}
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};
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||
|
||
//
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||
// Envelope Generator Data
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||
//
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||
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||
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||
namespace EnvelopeGeneratorData
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||
{
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static const double MUGEN = std::numeric_limits<double>::infinity();
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// This table is indexed by the value of Operator.ksr
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// and the value of ChannelRegister.keyScaleNumber.
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static const int rateOffset[2][16] = {
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{0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3},
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{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
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};
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// These attack periods in miliseconds were taken from the YMF278B manual.
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// The attack actual rates range from 0 to 63, with different data for
|
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// 0%-100% and for 10%-90%:
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static const double attackTimeValuesTable[64][2] = {
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{MUGEN,MUGEN}, {MUGEN,MUGEN}, {MUGEN,MUGEN}, {MUGEN,MUGEN},
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{2826.24,1482.75}, {2252.80,1155.07}, {1884.16,991.23}, {1597.44,868.35},
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{1413.12,741.38}, {1126.40,577.54}, {942.08,495.62}, {798.72,434.18},
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{706.56,370.69}, {563.20,288.77}, {471.04,247.81}, {399.36,217.09},
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||
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{353.28,185.34}, {281.60,144.38}, {235.52,123.90}, {199.68,108.54},
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{176.76,92.67}, {140.80,72.19}, {117.76,61.95}, {99.84,54.27},
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{88.32,46.34}, {70.40,36.10}, {58.88,30.98}, {49.92,27.14},
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{44.16,23.17}, {35.20,18.05}, {29.44,15.49}, {24.96,13.57},
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||
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||
{22.08,11.58}, {17.60,9.02}, {14.72,7.74}, {12.48,6.78},
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||
{11.04,5.79}, {8.80,4.51}, {7.36,3.87}, {6.24,3.39},
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||
{5.52,2.90}, {4.40,2.26}, {3.68,1.94}, {3.12,1.70},
|
||
{2.76,1.45}, {2.20,1.13}, {1.84,0.97}, {1.56,0.85},
|
||
|
||
{1.40,0.73}, {1.12,0.61}, {0.92,0.49}, {0.80,0.43},
|
||
{0.70,0.37}, {0.56,0.31}, {0.46,0.26}, {0.42,0.22},
|
||
{0.38,0.19}, {0.30,0.14}, {0.24,0.11}, {0.20,0.11},
|
||
{0.00,0.00}, {0.00,0.00}, {0.00,0.00}, {0.00,0.00}
|
||
};
|
||
|
||
// These decay and release periods in milliseconds were taken from the YMF278B manual.
|
||
// The rate index range from 0 to 63, with different data for
|
||
// 0%-100% and for 10%-90%:
|
||
static const double decayAndReleaseTimeValuesTable[64][2] = {
|
||
{MUGEN,MUGEN}, {MUGEN,MUGEN}, {MUGEN,MUGEN}, {MUGEN,MUGEN},
|
||
{39280.64,8212.48}, {31416.32,6574.08}, {26173.44,5509.12}, {22446.08,4730.88},
|
||
{19640.32,4106.24}, {15708.16,3287.04}, {13086.72,2754.56}, {11223.04,2365.44},
|
||
{9820.16,2053.12}, {7854.08,1643.52}, {6543.36,1377.28}, {5611.52,1182.72},
|
||
|
||
{4910.08,1026.56}, {3927.04,821.76}, {3271.68,688.64}, {2805.76,591.36},
|
||
{2455.04,513.28}, {1936.52,410.88}, {1635.84,344.34}, {1402.88,295.68},
|
||
{1227.52,256.64}, {981.76,205.44}, {817.92,172.16}, {701.44,147.84},
|
||
{613.76,128.32}, {490.88,102.72}, {488.96,86.08}, {350.72,73.92},
|
||
|
||
{306.88,64.16}, {245.44,51.36}, {204.48,43.04}, {175.36,36.96},
|
||
{153.44,32.08}, {122.72,25.68}, {102.24,21.52}, {87.68,18.48},
|
||
{76.72,16.04}, {61.36,12.84}, {51.12,10.76}, {43.84,9.24},
|
||
{38.36,8.02}, {30.68,6.42}, {25.56,5.38}, {21.92,4.62},
|
||
|
||
{19.20,4.02}, {15.36,3.22}, {12.80,2.68}, {10.96,2.32},
|
||
{9.60,2.02}, {7.68,1.62}, {6.40,1.35}, {5.48,1.15},
|
||
{4.80,1.01}, {3.84,0.81}, {3.20,0.69}, {2.74,0.58},
|
||
{2.40,0.51}, {2.40,0.51}, {2.40,0.51}, {2.40,0.51}
|
||
};
|
||
};
|
||
|
||
class OPL3 : public OPLEmul
|
||
{
|
||
public:
|
||
uint8_t registers[0x200];
|
||
|
||
Operator *operators[2][0x20];
|
||
Channel2op *channels2op[2][9];
|
||
Channel4op *channels4op[2][3];
|
||
Channel *channels[2][9];
|
||
|
||
// Unique instance to fill future gaps in the Channel array,
|
||
// when there will be switches between 2op and 4op mode.
|
||
DisabledChannel disabledChannel;
|
||
|
||
// Specific operators to switch when in rhythm mode:
|
||
HighHatOperator highHatOperator;
|
||
SnareDrumOperator snareDrumOperator;
|
||
TomTomOperator tomTomOperator;
|
||
TomTomTopCymbalChannel tomTomTopCymbalChannel;
|
||
|
||
// Rhythm channels
|
||
BassDrumChannel bassDrumChannel;
|
||
HighHatSnareDrumChannel highHatSnareDrumChannel;
|
||
TopCymbalOperator topCymbalOperator;
|
||
|
||
Operator *highHatOperatorInNonRhythmMode;
|
||
Operator *snareDrumOperatorInNonRhythmMode;
|
||
Operator *tomTomOperatorInNonRhythmMode;
|
||
Operator *topCymbalOperatorInNonRhythmMode;
|
||
|
||
int nts, dam, dvb, ryt, bd, sd, tom, tc, hh, _new, connectionsel;
|
||
int vibratoIndex, tremoloIndex;
|
||
|
||
bool FullPan;
|
||
|
||
static OperatorDataStruct *OperatorData;
|
||
static OPL3DataStruct *OPL3Data;
|
||
|
||
// The methods read() and write() are the only
|
||
// ones needed by the user to interface with the emulator.
|
||
// read() returns one frame at a time, to be played at 49700 Hz,
|
||
// with each frame being four 16-bit samples,
|
||
// corresponding to the OPL3 four output channels CHA...CHD.
|
||
public:
|
||
//void read(float output[2]);
|
||
void write(int array, int address, int data);
|
||
|
||
OPL3(bool fullpan);
|
||
~OPL3();
|
||
|
||
private:
|
||
void initOperators();
|
||
void initChannels2op();
|
||
void initChannels4op();
|
||
void initRhythmChannels();
|
||
void initChannels();
|
||
void update_1_NTS1_6();
|
||
void update_DAM1_DVB1_RYT1_BD1_SD1_TOM1_TC1_HH1();
|
||
void update_7_NEW1();
|
||
void setEnabledChannels();
|
||
void updateChannelPans();
|
||
void update_2_CONNECTIONSEL6();
|
||
void set4opConnections();
|
||
void setRhythmMode();
|
||
|
||
static int InstanceCount;
|
||
|
||
// OPLEmul interface
|
||
public:
|
||
void Reset();
|
||
void WriteReg(int reg, int v);
|
||
void Update(float *buffer, int length);
|
||
void SetPanning(int c, float left, float right);
|
||
};
|
||
|
||
OperatorDataStruct *OPL3::OperatorData;
|
||
OPL3DataStruct *OPL3::OPL3Data;
|
||
int OPL3::InstanceCount;
|
||
|
||
void OPL3::Update(float *output, int numsamples) {
|
||
while (numsamples--) {
|
||
// If _new = 0, use OPL2 mode with 9 channels. If _new = 1, use OPL3 18 channels;
|
||
for(int array=0; array < (_new + 1); array++)
|
||
for(int channelNumber=0; channelNumber < 9; channelNumber++) {
|
||
// Reads output from each OPL3 channel, and accumulates it in the output buffer:
|
||
Channel *channel = channels[array][channelNumber];
|
||
if (channel != &disabledChannel)
|
||
{
|
||
double channelOutput = channel->getChannelOutput(this);
|
||
output[0] += float(channelOutput * channel->leftPan);
|
||
output[1] += float(channelOutput * channel->rightPan);
|
||
}
|
||
}
|
||
|
||
// Advances the OPL3-wide vibrato index, which is used by
|
||
// PhaseGenerator.getPhase() in each Operator.
|
||
vibratoIndex = (vibratoIndex + 1) & (OPL3DataStruct::vibratoTableLength - 1);
|
||
// Advances the OPL3-wide tremolo index, which is used by
|
||
// EnvelopeGenerator.getEnvelope() in each Operator.
|
||
tremoloIndex++;
|
||
if(tremoloIndex >= OPL3DataStruct::tremoloTableLength) tremoloIndex = 0;
|
||
output += 2;
|
||
}
|
||
}
|
||
|
||
void OPL3::write(int array, int address, int data) {
|
||
// The OPL3 has two registers arrays, each with adresses ranging
|
||
// from 0x00 to 0xF5.
|
||
// This emulator uses one array, with the two original register arrays
|
||
// starting at 0x00 and at 0x100.
|
||
int registerAddress = (array<<8) | address;
|
||
// If the address is out of the OPL3 memory map, returns.
|
||
if(registerAddress<0 || registerAddress>=0x200) return;
|
||
|
||
registers[registerAddress] = data;
|
||
switch(address&0xE0) {
|
||
// The first 3 bits masking gives the type of the register by using its base address:
|
||
// 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0, 0xE0
|
||
// When it is needed, we further separate the register type inside each base address,
|
||
// which is the case of 0x00 and 0xA0.
|
||
|
||
// Through out this emulator we will use the same name convention to
|
||
// reference a byte with several bit registers.
|
||
// The name of each bit register will be followed by the number of bits
|
||
// it occupies inside the byte.
|
||
// Numbers without accompanying names are unused bits.
|
||
case 0x00:
|
||
// Unique registers for the entire OPL3:
|
||
if(array==1) {
|
||
if(address==0x04)
|
||
update_2_CONNECTIONSEL6();
|
||
else if(address==0x05)
|
||
update_7_NEW1();
|
||
}
|
||
else if(address==0x08) update_1_NTS1_6();
|
||
break;
|
||
|
||
case 0xA0:
|
||
// 0xBD is a control register for the entire OPL3:
|
||
if(address==0xBD) {
|
||
if(array==0)
|
||
update_DAM1_DVB1_RYT1_BD1_SD1_TOM1_TC1_HH1();
|
||
break;
|
||
}
|
||
// Registers for each channel are in A0-A8, B0-B8, C0-C8, in both register arrays.
|
||
// 0xB0...0xB8 keeps kon,block,fnum(h) for each channel.
|
||
if( (address&0xF0) == 0xB0 && address <= 0xB8) {
|
||
// If the address is in the second register array, adds 9 to the channel number.
|
||
// The channel number is given by the last four bits, like in A0,...,A8.
|
||
channels[array][address&0x0F]->update_2_KON1_BLOCK3_FNUMH2(this);
|
||
break;
|
||
}
|
||
// 0xA0...0xA8 keeps fnum(l) for each channel.
|
||
if( (address&0xF0) == 0xA0 && address <= 0xA8)
|
||
channels[array][address&0x0F]->update_FNUML8(this);
|
||
break;
|
||
// 0xC0...0xC8 keeps cha,chb,chc,chd,fb,cnt for each channel:
|
||
case 0xC0:
|
||
if(address <= 0xC8)
|
||
channels[array][address&0x0F]->update_CHD1_CHC1_CHB1_CHA1_FB3_CNT1(this);
|
||
break;
|
||
|
||
// Registers for each of the 36 Operators:
|
||
default:
|
||
int operatorOffset = address&0x1F;
|
||
if(operators[array][operatorOffset] == NULL) break;
|
||
switch(address&0xE0) {
|
||
// 0x20...0x35 keeps am,vib,egt,ksr,mult for each operator:
|
||
case 0x20:
|
||
operators[array][operatorOffset]->update_AM1_VIB1_EGT1_KSR1_MULT4(this);
|
||
break;
|
||
// 0x40...0x55 keeps ksl,tl for each operator:
|
||
case 0x40:
|
||
operators[array][operatorOffset]->update_KSL2_TL6(this);
|
||
break;
|
||
// 0x60...0x75 keeps ar,dr for each operator:
|
||
case 0x60:
|
||
operators[array][operatorOffset]->update_AR4_DR4(this);
|
||
break;
|
||
// 0x80...0x95 keeps sl,rr for each operator:
|
||
case 0x80:
|
||
operators[array][operatorOffset]->update_SL4_RR4(this);
|
||
break;
|
||
// 0xE0...0xF5 keeps ws for each operator:
|
||
case 0xE0:
|
||
operators[array][operatorOffset]->update_5_WS3(this);
|
||
}
|
||
}
|
||
}
|
||
|
||
OPL3::OPL3(bool fullpan)
|
||
: tomTomTopCymbalChannel(fullpan ? CENTER_PANNING_POWER : 1, &tomTomOperator, &topCymbalOperator),
|
||
bassDrumChannel(fullpan ? CENTER_PANNING_POWER : 1),
|
||
highHatSnareDrumChannel(fullpan ? CENTER_PANNING_POWER : 1, &highHatOperator, &snareDrumOperator)
|
||
{
|
||
FullPan = fullpan;
|
||
nts = dam = dvb = ryt = bd = sd = tom = tc = hh = _new = connectionsel = 0;
|
||
vibratoIndex = tremoloIndex = 0;
|
||
|
||
if (InstanceCount++ == 0)
|
||
{
|
||
OPL3Data = new struct OPL3DataStruct;
|
||
OperatorData = new struct OperatorDataStruct;
|
||
}
|
||
|
||
initOperators();
|
||
initChannels2op();
|
||
initChannels4op();
|
||
initRhythmChannels();
|
||
initChannels();
|
||
}
|
||
|
||
OPL3::~OPL3()
|
||
{
|
||
ryt = 0;
|
||
setRhythmMode(); // Make sure all operators point to the dynamically allocated ones.
|
||
for (int array = 0; array < 2; array++)
|
||
{
|
||
for (int operatorNumber = 0; operatorNumber < 0x20; operatorNumber++)
|
||
{
|
||
if (operators[array][operatorNumber] != NULL)
|
||
{
|
||
delete operators[array][operatorNumber];
|
||
}
|
||
}
|
||
for (int channelNumber = 0; channelNumber < 9; channelNumber++)
|
||
{
|
||
delete channels2op[array][channelNumber];
|
||
}
|
||
for (int channelNumber = 0; channelNumber < 3; channelNumber++)
|
||
{
|
||
delete channels4op[array][channelNumber];
|
||
}
|
||
}
|
||
if (--InstanceCount == 0)
|
||
{
|
||
delete OPL3Data;
|
||
OPL3Data = NULL;
|
||
delete OperatorData;
|
||
OperatorData = NULL;
|
||
}
|
||
}
|
||
|
||
|
||
void OPL3::initOperators() {
|
||
int baseAddress;
|
||
// The YMF262 has 36 operators:
|
||
memset(operators, 0, sizeof(operators));
|
||
for(int array=0; array<2; array++)
|
||
for(int group = 0; group<=0x10; group+=8)
|
||
for(int offset=0; offset<6; offset++) {
|
||
baseAddress = (array<<8) | (group+offset);
|
||
operators[array][group+offset] = new Operator(baseAddress);
|
||
}
|
||
|
||
// Save operators when they are in non-rhythm mode:
|
||
// Channel 7:
|
||
highHatOperatorInNonRhythmMode = operators[0][0x11];
|
||
snareDrumOperatorInNonRhythmMode = operators[0][0x14];
|
||
// Channel 8:
|
||
tomTomOperatorInNonRhythmMode = operators[0][0x12];
|
||
topCymbalOperatorInNonRhythmMode = operators[0][0x15];
|
||
|
||
}
|
||
|
||
void OPL3::initChannels2op() {
|
||
// The YMF262 has 18 2-op channels.
|
||
// Each 2-op channel can be at a serial or parallel operator configuration:
|
||
memset(channels2op, 0, sizeof(channels2op));
|
||
double startvol = FullPan ? CENTER_PANNING_POWER : 1;
|
||
for(int array=0; array<2; array++)
|
||
for(int channelNumber=0; channelNumber<3; channelNumber++) {
|
||
int baseAddress = (array<<8) | channelNumber;
|
||
// Channels 1, 2, 3 -> Operator offsets 0x0,0x3; 0x1,0x4; 0x2,0x5
|
||
channels2op[array][channelNumber] = new Channel2op(baseAddress, startvol, operators[array][channelNumber], operators[array][channelNumber+0x3]);
|
||
// Channels 4, 5, 6 -> Operator offsets 0x8,0xB; 0x9,0xC; 0xA,0xD
|
||
channels2op[array][channelNumber+3] = new Channel2op(baseAddress+3, startvol, operators[array][channelNumber+0x8], operators[array][channelNumber+0xB]);
|
||
// Channels 7, 8, 9 -> Operators 0x10,0x13; 0x11,0x14; 0x12,0x15
|
||
channels2op[array][channelNumber+6] = new Channel2op(baseAddress+6, startvol, operators[array][channelNumber+0x10], operators[array][channelNumber+0x13]);
|
||
}
|
||
}
|
||
|
||
void OPL3::initChannels4op() {
|
||
// The YMF262 has 3 4-op channels in each array:
|
||
memset(channels4op, 0, sizeof(channels4op));
|
||
double startvol = FullPan ? CENTER_PANNING_POWER : 1;
|
||
for(int array=0; array<2; array++)
|
||
for(int channelNumber=0; channelNumber<3; channelNumber++) {
|
||
int baseAddress = (array<<8) | channelNumber;
|
||
// Channels 1, 2, 3 -> Operators 0x0,0x3,0x8,0xB; 0x1,0x4,0x9,0xC; 0x2,0x5,0xA,0xD;
|
||
channels4op[array][channelNumber] = new Channel4op(baseAddress, startvol, operators[array][channelNumber], operators[array][channelNumber+0x3], operators[array][channelNumber+0x8], operators[array][channelNumber+0xB]);
|
||
}
|
||
}
|
||
|
||
void OPL3::initRhythmChannels() {
|
||
}
|
||
|
||
void OPL3::initChannels() {
|
||
// Channel is an abstract class that can be a 2-op, 4-op, rhythm or disabled channel,
|
||
// depending on the OPL3 configuration at the time.
|
||
// channels[] inits as a 2-op serial channel array:
|
||
for(int array=0; array<2; array++)
|
||
for(int i=0; i<9; i++) channels[array][i] = channels2op[array][i];
|
||
}
|
||
|
||
void OPL3::update_1_NTS1_6() {
|
||
int _1_nts1_6 = registers[OPL3DataStruct::_1_NTS1_6_Offset];
|
||
// Note Selection. This register is used in Channel.updateOperators() implementations,
|
||
// to calculate the channel´s Key Scale Number.
|
||
// The value of the actual envelope rate follows the value of
|
||
// OPL3.nts,Operator.keyScaleNumber and Operator.ksr
|
||
nts = (_1_nts1_6 & 0x40) >> 6;
|
||
}
|
||
|
||
void OPL3::update_DAM1_DVB1_RYT1_BD1_SD1_TOM1_TC1_HH1() {
|
||
int dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 = registers[OPL3DataStruct::DAM1_DVB1_RYT1_BD1_SD1_TOM1_TC1_HH1_Offset];
|
||
// Depth of amplitude. This register is used in EnvelopeGenerator.getEnvelope();
|
||
dam = (dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 & 0x80) >> 7;
|
||
|
||
// Depth of vibrato. This register is used in PhaseGenerator.getPhase();
|
||
dvb = (dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 & 0x40) >> 6;
|
||
|
||
int new_ryt = (dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 & 0x20) >> 5;
|
||
if(new_ryt != ryt) {
|
||
ryt = new_ryt;
|
||
setRhythmMode();
|
||
}
|
||
|
||
int new_bd = (dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 & 0x10) >> 4;
|
||
if(new_bd != bd) {
|
||
bd = new_bd;
|
||
if(bd==1) {
|
||
bassDrumChannel.op1->keyOn();
|
||
bassDrumChannel.op2->keyOn();
|
||
}
|
||
}
|
||
|
||
int new_sd = (dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 & 0x08) >> 3;
|
||
if(new_sd != sd) {
|
||
sd = new_sd;
|
||
if(sd==1) snareDrumOperator.keyOn();
|
||
}
|
||
|
||
int new_tom = (dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 & 0x04) >> 2;
|
||
if(new_tom != tom) {
|
||
tom = new_tom;
|
||
if(tom==1) tomTomOperator.keyOn();
|
||
}
|
||
|
||
int new_tc = (dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 & 0x02) >> 1;
|
||
if(new_tc != tc) {
|
||
tc = new_tc;
|
||
if(tc==1) topCymbalOperator.keyOn();
|
||
}
|
||
|
||
int new_hh = dam1_dvb1_ryt1_bd1_sd1_tom1_tc1_hh1 & 0x01;
|
||
if(new_hh != hh) {
|
||
hh = new_hh;
|
||
if(hh==1) highHatOperator.keyOn();
|
||
}
|
||
|
||
}
|
||
|
||
void OPL3::update_7_NEW1() {
|
||
int _7_new1 = registers[OPL3DataStruct::_7_NEW1_Offset];
|
||
// OPL2/OPL3 mode selection. This register is used in
|
||
// OPL3.read(), OPL3.write() and Operator.getOperatorOutput();
|
||
_new = (_7_new1 & 0x01);
|
||
if(_new==1) setEnabledChannels();
|
||
set4opConnections();
|
||
updateChannelPans();
|
||
}
|
||
|
||
void OPL3::setEnabledChannels() {
|
||
for(int array=0; array<2; array++)
|
||
for(int i=0; i<9; i++) {
|
||
int baseAddress = channels[array][i]->channelBaseAddress;
|
||
registers[baseAddress+ChannelData::CHD1_CHC1_CHB1_CHA1_FB3_CNT1_Offset] |= 0xF0;
|
||
channels[array][i]->update_CHD1_CHC1_CHB1_CHA1_FB3_CNT1(this);
|
||
}
|
||
}
|
||
|
||
void OPL3::updateChannelPans() {
|
||
for(int array=0; array<2; array++)
|
||
for(int i=0; i<9; i++) {
|
||
int baseAddress = channels[array][i]->channelBaseAddress;
|
||
registers[baseAddress+ChannelData::CHD1_CHC1_CHB1_CHA1_FB3_CNT1_Offset] |= 0xF0;
|
||
channels[array][i]->updatePan(this);
|
||
}
|
||
|
||
}
|
||
|
||
void OPL3::update_2_CONNECTIONSEL6() {
|
||
// This method is called only if _new is set.
|
||
int _2_connectionsel6 = registers[OPL3DataStruct::_2_CONNECTIONSEL6_Offset];
|
||
// 2-op/4-op channel selection. This register is used here to configure the OPL3.channels[] array.
|
||
connectionsel = (_2_connectionsel6 & 0x3F);
|
||
set4opConnections();
|
||
}
|
||
|
||
void OPL3::set4opConnections() {
|
||
// bits 0, 1, 2 sets respectively 2-op channels (1,4), (2,5), (3,6) to 4-op operation.
|
||
// bits 3, 4, 5 sets respectively 2-op channels (10,13), (11,14), (12,15) to 4-op operation.
|
||
for(int array=0; array<2; array++)
|
||
for(int i=0; i<3; i++) {
|
||
if(_new == 1) {
|
||
int shift = array*3 + i;
|
||
int connectionBit = (connectionsel >> shift) & 0x01;
|
||
if(connectionBit == 1) {
|
||
channels[array][i] = channels4op[array][i];
|
||
channels[array][i+3] = &disabledChannel;
|
||
channels[array][i]->updateChannel(this);
|
||
continue;
|
||
}
|
||
}
|
||
channels[array][i] = channels2op[array][i];
|
||
channels[array][i+3] = channels2op[array][i+3];
|
||
channels[array][i]->updateChannel(this);
|
||
channels[array][i+3]->updateChannel(this);
|
||
}
|
||
}
|
||
|
||
void OPL3::setRhythmMode() {
|
||
if(ryt==1) {
|
||
channels[0][6] = &bassDrumChannel;
|
||
channels[0][7] = &highHatSnareDrumChannel;
|
||
channels[0][8] = &tomTomTopCymbalChannel;
|
||
operators[0][0x11] = &highHatOperator;
|
||
operators[0][0x14] = &snareDrumOperator;
|
||
operators[0][0x12] = &tomTomOperator;
|
||
operators[0][0x15] = &topCymbalOperator;
|
||
}
|
||
else {
|
||
for(int i=6; i<=8; i++) channels[0][i] = channels2op[0][i];
|
||
operators[0][0x11] = highHatOperatorInNonRhythmMode;
|
||
operators[0][0x14] = snareDrumOperatorInNonRhythmMode;
|
||
operators[0][0x12] = tomTomOperatorInNonRhythmMode;
|
||
operators[0][0x15] = topCymbalOperatorInNonRhythmMode;
|
||
}
|
||
for(int i=6; i<=8; i++) channels[0][i]->updateChannel(this);
|
||
}
|
||
|
||
static double EnvelopeFromDB(double db)
|
||
{
|
||
#if 0
|
||
return pow(10.0, db/10);
|
||
#else
|
||
if (db < MIN_DB)
|
||
return 0;
|
||
return OPL3::OperatorData->dbpow[xs_FloorToInt(-db * DB_TABLE_RES)];
|
||
#endif
|
||
}
|
||
|
||
Channel::Channel (int baseAddress, double startvol) {
|
||
channelBaseAddress = baseAddress;
|
||
fnuml = fnumh = kon = block = fb = cnt = 0;
|
||
feedback[0] = feedback[1] = 0;
|
||
leftPan = rightPan = startvol;
|
||
}
|
||
|
||
void Channel::update_2_KON1_BLOCK3_FNUMH2(OPL3 *OPL3) {
|
||
|
||
int _2_kon1_block3_fnumh2 = OPL3->registers[channelBaseAddress+ChannelData::_2_KON1_BLOCK3_FNUMH2_Offset];
|
||
|
||
// Frequency Number (hi-register) and Block. These two registers, together with fnuml,
|
||
// sets the Channel´s base frequency;
|
||
block = (_2_kon1_block3_fnumh2 & 0x1C) >> 2;
|
||
fnumh = _2_kon1_block3_fnumh2 & 0x03;
|
||
updateOperators(OPL3);
|
||
|
||
// Key On. If changed, calls Channel.keyOn() / keyOff().
|
||
int newKon = (_2_kon1_block3_fnumh2 & 0x20) >> 5;
|
||
if(newKon != kon) {
|
||
if(newKon == 1) keyOn();
|
||
else keyOff();
|
||
kon = newKon;
|
||
}
|
||
}
|
||
|
||
void Channel::update_FNUML8(OPL3 *OPL3) {
|
||
int fnuml8 = OPL3->registers[channelBaseAddress+ChannelData::FNUML8_Offset];
|
||
// Frequency Number, low register.
|
||
fnuml = fnuml8&0xFF;
|
||
updateOperators(OPL3);
|
||
}
|
||
|
||
void Channel::update_CHD1_CHC1_CHB1_CHA1_FB3_CNT1(OPL3 *OPL3) {
|
||
int chd1_chc1_chb1_cha1_fb3_cnt1 = OPL3->registers[channelBaseAddress+ChannelData::CHD1_CHC1_CHB1_CHA1_FB3_CNT1_Offset];
|
||
// chd = (chd1_chc1_chb1_cha1_fb3_cnt1 & 0x80) >> 7;
|
||
// chc = (chd1_chc1_chb1_cha1_fb3_cnt1 & 0x40) >> 6;
|
||
chb = (chd1_chc1_chb1_cha1_fb3_cnt1 & 0x20) >> 5;
|
||
cha = (chd1_chc1_chb1_cha1_fb3_cnt1 & 0x10) >> 4;
|
||
fb = (chd1_chc1_chb1_cha1_fb3_cnt1 & 0x0E) >> 1;
|
||
cnt = chd1_chc1_chb1_cha1_fb3_cnt1 & 0x01;
|
||
updatePan(OPL3);
|
||
updateOperators(OPL3);
|
||
}
|
||
|
||
void Channel::updatePan(OPL3 *OPL3) {
|
||
if (!OPL3->FullPan)
|
||
{
|
||
if (OPL3->_new == 0)
|
||
{
|
||
leftPan = VOLUME_MUL;
|
||
rightPan = VOLUME_MUL;
|
||
}
|
||
else
|
||
{
|
||
leftPan = cha * VOLUME_MUL;
|
||
rightPan = chb * VOLUME_MUL;
|
||
}
|
||
}
|
||
}
|
||
|
||
void Channel::updateChannel(OPL3 *OPL3) {
|
||
update_2_KON1_BLOCK3_FNUMH2(OPL3);
|
||
update_FNUML8(OPL3);
|
||
update_CHD1_CHC1_CHB1_CHA1_FB3_CNT1(OPL3);
|
||
}
|
||
|
||
Channel2op::Channel2op (int baseAddress, double startvol, Operator *o1, Operator *o2)
|
||
: Channel(baseAddress, startvol)
|
||
{
|
||
op1 = o1;
|
||
op2 = o2;
|
||
}
|
||
|
||
double Channel2op::getChannelOutput(OPL3 *OPL3) {
|
||
double channelOutput = 0, op1Output = 0, op2Output = 0;
|
||
// The feedback uses the last two outputs from
|
||
// the first operator, instead of just the last one.
|
||
double feedbackOutput = (feedback[0] + feedback[1]) / 2;
|
||
|
||
switch(cnt) {
|
||
// CNT = 0, the operators are in series, with the first in feedback.
|
||
case 0:
|
||
if(op2->envelopeGenerator.stage==EnvelopeGenerator::OFF)
|
||
return 0;
|
||
op1Output = op1->getOperatorOutput(OPL3, feedbackOutput);
|
||
channelOutput = op2->getOperatorOutput(OPL3, op1Output*toPhase);
|
||
break;
|
||
// CNT = 1, the operators are in parallel, with the first in feedback.
|
||
case 1:
|
||
if(op1->envelopeGenerator.stage==EnvelopeGenerator::OFF &&
|
||
op2->envelopeGenerator.stage==EnvelopeGenerator::OFF)
|
||
return 0;
|
||
op1Output = op1->getOperatorOutput(OPL3, feedbackOutput);
|
||
op2Output = op2->getOperatorOutput(OPL3, Operator::noModulator);
|
||
channelOutput = (op1Output + op2Output) / 2;
|
||
}
|
||
|
||
feedback[0] = feedback[1];
|
||
feedback[1] = StripIntPart(op1Output * ChannelData::feedback[fb]);
|
||
return channelOutput;
|
||
}
|
||
|
||
void Channel2op::keyOn() {
|
||
op1->keyOn();
|
||
op2->keyOn();
|
||
feedback[0] = feedback[1] = 0;
|
||
}
|
||
|
||
void Channel2op::keyOff() {
|
||
op1->keyOff();
|
||
op2->keyOff();
|
||
}
|
||
|
||
void Channel2op::updateOperators(OPL3 *OPL3) {
|
||
// Key Scale Number, used in EnvelopeGenerator.setActualRates().
|
||
int keyScaleNumber = block*2 + ((fnumh>>OPL3->nts)&0x01);
|
||
int f_number = (fnumh<<8) | fnuml;
|
||
op1->updateOperator(OPL3, keyScaleNumber, f_number, block);
|
||
op2->updateOperator(OPL3, keyScaleNumber, f_number, block);
|
||
}
|
||
|
||
Channel4op::Channel4op (int baseAddress, double startvol, Operator *o1, Operator *o2, Operator *o3, Operator *o4)
|
||
: Channel(baseAddress, startvol)
|
||
{
|
||
op1 = o1;
|
||
op2 = o2;
|
||
op3 = o3;
|
||
op4 = o4;
|
||
}
|
||
|
||
double Channel4op::getChannelOutput(OPL3 *OPL3) {
|
||
double channelOutput = 0,
|
||
op1Output = 0, op2Output = 0, op3Output = 0, op4Output = 0;
|
||
|
||
int secondChannelBaseAddress = channelBaseAddress+3;
|
||
int secondCnt = OPL3->registers[secondChannelBaseAddress+ChannelData::CHD1_CHC1_CHB1_CHA1_FB3_CNT1_Offset] & 0x1;
|
||
int cnt4op = (cnt << 1) | secondCnt;
|
||
|
||
double feedbackOutput = (feedback[0] + feedback[1]) / 2;
|
||
|
||
switch(cnt4op) {
|
||
case 0:
|
||
if(op4->envelopeGenerator.stage==EnvelopeGenerator::OFF)
|
||
return 0;
|
||
|
||
op1Output = op1->getOperatorOutput(OPL3, feedbackOutput);
|
||
op2Output = op2->getOperatorOutput(OPL3, op1Output*toPhase);
|
||
op3Output = op3->getOperatorOutput(OPL3, op2Output*toPhase);
|
||
channelOutput = op4->getOperatorOutput(OPL3, op3Output*toPhase);
|
||
|
||
break;
|
||
case 1:
|
||
if(op2->envelopeGenerator.stage==EnvelopeGenerator::OFF &&
|
||
op4->envelopeGenerator.stage==EnvelopeGenerator::OFF)
|
||
return 0;
|
||
|
||
op1Output = op1->getOperatorOutput(OPL3, feedbackOutput);
|
||
op2Output = op2->getOperatorOutput(OPL3, op1Output*toPhase);
|
||
|
||
op3Output = op3->getOperatorOutput(OPL3, Operator::noModulator);
|
||
op4Output = op4->getOperatorOutput(OPL3, op3Output*toPhase);
|
||
|
||
channelOutput = (op2Output + op4Output) / 2;
|
||
break;
|
||
case 2:
|
||
if(op1->envelopeGenerator.stage==EnvelopeGenerator::OFF &&
|
||
op4->envelopeGenerator.stage==EnvelopeGenerator::OFF)
|
||
return 0;
|
||
|
||
op1Output = op1->getOperatorOutput(OPL3, feedbackOutput);
|
||
|
||
op2Output = op2->getOperatorOutput(OPL3, Operator::noModulator);
|
||
op3Output = op3->getOperatorOutput(OPL3, op2Output*toPhase);
|
||
op4Output = op4->getOperatorOutput(OPL3, op3Output*toPhase);
|
||
|
||
channelOutput = (op1Output + op4Output) / 2;
|
||
break;
|
||
case 3:
|
||
if(op1->envelopeGenerator.stage==EnvelopeGenerator::OFF &&
|
||
op3->envelopeGenerator.stage==EnvelopeGenerator::OFF &&
|
||
op4->envelopeGenerator.stage==EnvelopeGenerator::OFF)
|
||
return 0;
|
||
|
||
op1Output = op1->getOperatorOutput(OPL3, feedbackOutput);
|
||
|
||
op2Output = op2->getOperatorOutput(OPL3, Operator::noModulator);
|
||
op3Output = op3->getOperatorOutput(OPL3, op2Output*toPhase);
|
||
|
||
op4Output = op4->getOperatorOutput(OPL3, Operator::noModulator);
|
||
|
||
channelOutput = (op1Output + op3Output + op4Output) / 3;
|
||
}
|
||
|
||
feedback[0] = feedback[1];
|
||
feedback[1] = StripIntPart(op1Output * ChannelData::feedback[fb]);
|
||
|
||
return channelOutput;
|
||
}
|
||
|
||
void Channel4op::keyOn() {
|
||
op1->keyOn();
|
||
op2->keyOn();
|
||
op3->keyOn();
|
||
op4->keyOn();
|
||
feedback[0] = feedback[1] = 0;
|
||
}
|
||
|
||
void Channel4op::keyOff() {
|
||
op1->keyOff();
|
||
op2->keyOff();
|
||
op3->keyOff();
|
||
op4->keyOff();
|
||
}
|
||
|
||
void Channel4op::updateOperators(OPL3 *OPL3) {
|
||
// Key Scale Number, used in EnvelopeGenerator.setActualRates().
|
||
int keyScaleNumber = block*2 + ((fnumh>>OPL3->nts)&0x01);
|
||
int f_number = (fnumh<<8) | fnuml;
|
||
op1->updateOperator(OPL3, keyScaleNumber, f_number, block);
|
||
op2->updateOperator(OPL3, keyScaleNumber, f_number, block);
|
||
op3->updateOperator(OPL3, keyScaleNumber, f_number, block);
|
||
op4->updateOperator(OPL3, keyScaleNumber, f_number, block);
|
||
}
|
||
|
||
const double Operator::noModulator = 0;
|
||
|
||
Operator::Operator(int baseAddress) {
|
||
operatorBaseAddress = baseAddress;
|
||
|
||
envelope = 0;
|
||
am = vib = ksr = egt = mult = ksl = tl = ar = dr = sl = rr = ws = 0;
|
||
keyScaleNumber = f_number = block = 0;
|
||
}
|
||
|
||
void Operator::update_AM1_VIB1_EGT1_KSR1_MULT4(OPL3 *OPL3) {
|
||
|
||
int am1_vib1_egt1_ksr1_mult4 = OPL3->registers[operatorBaseAddress+OperatorDataStruct::AM1_VIB1_EGT1_KSR1_MULT4_Offset];
|
||
|
||
// Amplitude Modulation. This register is used int EnvelopeGenerator.getEnvelope();
|
||
am = (am1_vib1_egt1_ksr1_mult4 & 0x80) >> 7;
|
||
// Vibrato. This register is used in PhaseGenerator.getPhase();
|
||
vib = (am1_vib1_egt1_ksr1_mult4 & 0x40) >> 6;
|
||
// Envelope Generator Type. This register is used in EnvelopeGenerator.getEnvelope();
|
||
egt = (am1_vib1_egt1_ksr1_mult4 & 0x20) >> 5;
|
||
// Key Scale Rate. Sets the actual envelope rate together with rate and keyScaleNumber.
|
||
// This register os used in EnvelopeGenerator.setActualAttackRate().
|
||
ksr = (am1_vib1_egt1_ksr1_mult4 & 0x10) >> 4;
|
||
// Multiple. Multiplies the Channel.baseFrequency to get the Operator.operatorFrequency.
|
||
// This register is used in PhaseGenerator.setFrequency().
|
||
mult = am1_vib1_egt1_ksr1_mult4 & 0x0F;
|
||
|
||
phaseGenerator.setFrequency(f_number, block, mult);
|
||
envelopeGenerator.setActualAttackRate(ar, ksr, keyScaleNumber);
|
||
envelopeGenerator.setActualDecayRate(dr, ksr, keyScaleNumber);
|
||
envelopeGenerator.setActualReleaseRate(rr, ksr, keyScaleNumber);
|
||
}
|
||
|
||
void Operator::update_KSL2_TL6(OPL3 *OPL3) {
|
||
|
||
int ksl2_tl6 = OPL3->registers[operatorBaseAddress+OperatorDataStruct::KSL2_TL6_Offset];
|
||
|
||
// Key Scale Level. Sets the attenuation in accordance with the octave.
|
||
ksl = (ksl2_tl6 & 0xC0) >> 6;
|
||
// Total Level. Sets the overall damping for the envelope.
|
||
tl = ksl2_tl6 & 0x3F;
|
||
|
||
envelopeGenerator.setAtennuation(f_number, block, ksl);
|
||
envelopeGenerator.setTotalLevel(tl);
|
||
}
|
||
|
||
void Operator::update_AR4_DR4(OPL3 *OPL3) {
|
||
|
||
int ar4_dr4 = OPL3->registers[operatorBaseAddress+OperatorDataStruct::AR4_DR4_Offset];
|
||
|
||
// Attack Rate.
|
||
ar = (ar4_dr4 & 0xF0) >> 4;
|
||
// Decay Rate.
|
||
dr = ar4_dr4 & 0x0F;
|
||
|
||
envelopeGenerator.setActualAttackRate(ar, ksr, keyScaleNumber);
|
||
envelopeGenerator.setActualDecayRate(dr, ksr, keyScaleNumber);
|
||
}
|
||
|
||
void Operator::update_SL4_RR4(OPL3 *OPL3) {
|
||
|
||
int sl4_rr4 = OPL3->registers[operatorBaseAddress+OperatorDataStruct::SL4_RR4_Offset];
|
||
|
||
// Sustain Level.
|
||
sl = (sl4_rr4 & 0xF0) >> 4;
|
||
// Release Rate.
|
||
rr = sl4_rr4 & 0x0F;
|
||
|
||
envelopeGenerator.setActualSustainLevel(sl);
|
||
envelopeGenerator.setActualReleaseRate(rr, ksr, keyScaleNumber);
|
||
}
|
||
|
||
void Operator::update_5_WS3(OPL3 *OPL3) {
|
||
int _5_ws3 = OPL3->registers[operatorBaseAddress+OperatorDataStruct::_5_WS3_Offset];
|
||
ws = _5_ws3 & 0x07;
|
||
}
|
||
|
||
double Operator::getOperatorOutput(OPL3 *OPL3, double modulator) {
|
||
if(envelopeGenerator.stage == EnvelopeGenerator::OFF) return 0;
|
||
|
||
double envelopeInDB = envelopeGenerator.getEnvelope(OPL3, egt, am);
|
||
envelope = EnvelopeFromDB(envelopeInDB);
|
||
|
||
// If it is in OPL2 mode, use first four waveforms only:
|
||
ws &= ((OPL3->_new<<2) + 3);
|
||
double *waveform = OPL3::OperatorData->waveforms[ws];
|
||
|
||
phase = phaseGenerator.getPhase(OPL3, vib);
|
||
|
||
double operatorOutput = getOutput(modulator, phase, waveform);
|
||
return operatorOutput;
|
||
}
|
||
|
||
double Operator::getOutput(double modulator, double outputPhase, double *waveform) {
|
||
int sampleIndex = xs_FloorToInt((outputPhase + modulator) * OperatorDataStruct::waveLength) & (OperatorDataStruct::waveLength - 1);
|
||
return waveform[sampleIndex] * envelope;
|
||
}
|
||
|
||
void Operator::keyOn() {
|
||
if(ar > 0) {
|
||
envelopeGenerator.keyOn();
|
||
phaseGenerator.keyOn();
|
||
}
|
||
else envelopeGenerator.stage = EnvelopeGenerator::OFF;
|
||
}
|
||
|
||
void Operator::keyOff() {
|
||
envelopeGenerator.keyOff();
|
||
}
|
||
|
||
void Operator::updateOperator(OPL3 *OPL3, int ksn, int f_num, int blk) {
|
||
keyScaleNumber = ksn;
|
||
f_number = f_num;
|
||
block = blk;
|
||
update_AM1_VIB1_EGT1_KSR1_MULT4(OPL3);
|
||
update_KSL2_TL6(OPL3);
|
||
update_AR4_DR4(OPL3);
|
||
update_SL4_RR4(OPL3);
|
||
update_5_WS3(OPL3);
|
||
}
|
||
|
||
EnvelopeGenerator::EnvelopeGenerator() {
|
||
stage = OFF;
|
||
actualAttackRate = actualDecayRate = actualReleaseRate = 0;
|
||
xAttackIncrement = xMinimumInAttack = 0;
|
||
dBdecayIncrement = 0;
|
||
dBreleaseIncrement = 0;
|
||
attenuation = totalLevel = sustainLevel = 0;
|
||
x = dBtoX(-96);
|
||
envelope = -96;
|
||
}
|
||
|
||
void EnvelopeGenerator::setActualSustainLevel(int sl) {
|
||
// If all SL bits are 1, sustain level is set to -93 dB:
|
||
if(sl == 0x0F) {
|
||
sustainLevel = -93;
|
||
return;
|
||
}
|
||
// The datasheet states that the SL formula is
|
||
// sustainLevel = -24*d7 -12*d6 -6*d5 -3*d4,
|
||
// translated as:
|
||
sustainLevel = -3*sl;
|
||
}
|
||
|
||
void EnvelopeGenerator::setTotalLevel(int tl) {
|
||
// The datasheet states that the TL formula is
|
||
// TL = -(24*d5 + 12*d4 + 6*d3 + 3*d2 + 1.5*d1 + 0.75*d0),
|
||
// translated as:
|
||
totalLevel = tl*-0.75;
|
||
}
|
||
|
||
void EnvelopeGenerator::setAtennuation(int f_number, int block, int ksl) {
|
||
int hi4bits = (f_number>>6)&0x0F;
|
||
switch(ksl) {
|
||
case 0:
|
||
attenuation = 0;
|
||
break;
|
||
case 1:
|
||
// ~3 dB/Octave
|
||
attenuation = OperatorDataStruct::ksl3dBtable[hi4bits][block];
|
||
break;
|
||
case 2:
|
||
// ~1.5 dB/Octave
|
||
attenuation = OperatorDataStruct::ksl3dBtable[hi4bits][block]/2;
|
||
break;
|
||
case 3:
|
||
// ~6 dB/Octave
|
||
attenuation = OperatorDataStruct::ksl3dBtable[hi4bits][block]*2;
|
||
}
|
||
}
|
||
|
||
void EnvelopeGenerator::setActualAttackRate(int attackRate, int ksr, int keyScaleNumber) {
|
||
// According to the YMF278B manual's OPL3 section, the attack curve is exponential,
|
||
// with a dynamic range from -96 dB to 0 dB and a resolution of 0.1875 dB
|
||
// per level.
|
||
//
|
||
// This method sets an attack increment and attack minimum value
|
||
// that creates a exponential dB curve with 'period0to100' seconds in length
|
||
// and 'period10to90' seconds between 10% and 90% of the curve total level.
|
||
actualAttackRate = calculateActualRate(attackRate, ksr, keyScaleNumber);
|
||
double period0to100inSeconds = EnvelopeGeneratorData::attackTimeValuesTable[actualAttackRate][0]/1000.0;
|
||
int period0to100inSamples = (int)(period0to100inSeconds*OPL_SAMPLE_RATE);
|
||
double period10to90inSeconds = EnvelopeGeneratorData::attackTimeValuesTable[actualAttackRate][1]/1000.0;
|
||
int period10to90inSamples = (int)(period10to90inSeconds*OPL_SAMPLE_RATE);
|
||
// The x increment is dictated by the period between 10% and 90%:
|
||
xAttackIncrement = OPL3DataStruct::calculateIncrement(percentageToX(0.1), percentageToX(0.9), period10to90inSeconds);
|
||
// Discover how many samples are still from the top.
|
||
// It cannot reach 0 dB, since x is a logarithmic parameter and would be
|
||
// negative infinity. So we will use -0.1875 dB as the resolution
|
||
// maximum.
|
||
//
|
||
// percentageToX(0.9) + samplesToTheTop*xAttackIncrement = dBToX(-0.1875); ->
|
||
// samplesToTheTop = (dBtoX(-0.1875) - percentageToX(0.9)) / xAttackIncrement); ->
|
||
// period10to100InSamples = period10to90InSamples + samplesToTheTop; ->
|
||
int period10to100inSamples = (int) (period10to90inSamples + (dBtoX(-0.1875) - percentageToX(0.9)) / xAttackIncrement);
|
||
// Discover the minimum x that, through the attackIncrement value, keeps
|
||
// the 10%-90% period, and reaches 0 dB at the total period:
|
||
xMinimumInAttack = percentageToX(0.1) - (period0to100inSamples-period10to100inSamples)*xAttackIncrement;
|
||
}
|
||
|
||
|
||
void EnvelopeGenerator::setActualDecayRate(int decayRate, int ksr, int keyScaleNumber) {
|
||
actualDecayRate = calculateActualRate(decayRate, ksr, keyScaleNumber);
|
||
double period10to90inSeconds = EnvelopeGeneratorData::decayAndReleaseTimeValuesTable[actualDecayRate][1]/1000.0;
|
||
// Differently from the attack curve, the decay/release curve is linear.
|
||
// The dB increment is dictated by the period between 10% and 90%:
|
||
dBdecayIncrement = OPL3DataStruct::calculateIncrement(percentageToDB(0.1), percentageToDB(0.9), period10to90inSeconds);
|
||
}
|
||
|
||
void EnvelopeGenerator::setActualReleaseRate(int releaseRate, int ksr, int keyScaleNumber) {
|
||
actualReleaseRate = calculateActualRate(releaseRate, ksr, keyScaleNumber);
|
||
double period10to90inSeconds = EnvelopeGeneratorData::decayAndReleaseTimeValuesTable[actualReleaseRate][1]/1000.0;
|
||
dBreleaseIncrement = OPL3DataStruct::calculateIncrement(percentageToDB(0.1), percentageToDB(0.9), period10to90inSeconds);
|
||
}
|
||
|
||
int EnvelopeGenerator::calculateActualRate(int rate, int ksr, int keyScaleNumber) {
|
||
int rof = EnvelopeGeneratorData::rateOffset[ksr][keyScaleNumber];
|
||
int actualRate = rate*4 + rof;
|
||
// If, as an example at the maximum, rate is 15 and the rate offset is 15,
|
||
// the value would
|
||
// be 75, but the maximum allowed is 63:
|
||
if(actualRate > 63) actualRate = 63;
|
||
return actualRate;
|
||
}
|
||
|
||
double EnvelopeGenerator::getEnvelope(OPL3 *OPL3, int egt, int am) {
|
||
// The datasheets attenuation values
|
||
// must be halved to match the real OPL3 output.
|
||
double envelopeSustainLevel = sustainLevel / 2;
|
||
double envelopeTremolo =
|
||
OPL3::OPL3Data->tremoloTable[OPL3->dam][OPL3->tremoloIndex] / 2;
|
||
double envelopeAttenuation = attenuation / 2;
|
||
double envelopeTotalLevel = totalLevel / 2;
|
||
|
||
double envelopeMinimum = -96;
|
||
double envelopeResolution = 0.1875;
|
||
|
||
double outputEnvelope;
|
||
//
|
||
// Envelope Generation
|
||
//
|
||
switch(stage) {
|
||
case ATTACK:
|
||
// Since the attack is exponential, it will never reach 0 dB, so
|
||
// we´ll work with the next to maximum in the envelope resolution.
|
||
if(envelope<-envelopeResolution && xAttackIncrement != -EnvelopeGeneratorData::MUGEN) {
|
||
// The attack is exponential.
|
||
#if 0
|
||
envelope = -pow(2.0,x);
|
||
#else
|
||
int index = xs_FloorToInt((x - ATTACK_MIN) / ATTACK_RES);
|
||
if (index < 0)
|
||
envelope = OPL3::OperatorData->attackTable[0];
|
||
else if (index >= ATTACK_TABLE_SIZE)
|
||
envelope = OPL3::OperatorData->attackTable[ATTACK_TABLE_SIZE-1];
|
||
else
|
||
envelope = OPL3::OperatorData->attackTable[index];
|
||
#endif
|
||
x += xAttackIncrement;
|
||
break;
|
||
}
|
||
else {
|
||
// It is needed here to explicitly set envelope = 0, since
|
||
// only the attack can have a period of
|
||
// 0 seconds and produce an infinity envelope increment.
|
||
envelope = 0;
|
||
stage = DECAY;
|
||
}
|
||
case DECAY:
|
||
// The decay and release are linear.
|
||
if(envelope>envelopeSustainLevel) {
|
||
envelope -= dBdecayIncrement;
|
||
break;
|
||
}
|
||
else
|
||
stage = SUSTAIN;
|
||
case SUSTAIN:
|
||
// The Sustain stage is mantained all the time of the Key ON,
|
||
// even if we are in non-sustaining mode.
|
||
// This is necessary because, if the key is still pressed, we can
|
||
// change back and forth the state of EGT, and it will release and
|
||
// hold again accordingly.
|
||
if(egt==1) break;
|
||
else {
|
||
if(envelope > envelopeMinimum)
|
||
envelope -= dBreleaseIncrement;
|
||
else stage = OFF;
|
||
}
|
||
break;
|
||
case RELEASE:
|
||
// If we have Key OFF, only here we are in the Release stage.
|
||
// Now, we can turn EGT back and forth and it will have no effect,i.e.,
|
||
// it will release inexorably to the Off stage.
|
||
if(envelope > envelopeMinimum)
|
||
envelope -= dBreleaseIncrement;
|
||
else stage = OFF;
|
||
case OFF:
|
||
break;
|
||
}
|
||
|
||
// Ongoing original envelope
|
||
outputEnvelope = envelope;
|
||
|
||
//Tremolo
|
||
if(am == 1) outputEnvelope += envelopeTremolo;
|
||
|
||
//Attenuation
|
||
outputEnvelope += envelopeAttenuation;
|
||
|
||
//Total Level
|
||
outputEnvelope += envelopeTotalLevel;
|
||
|
||
return outputEnvelope;
|
||
}
|
||
|
||
void EnvelopeGenerator::keyOn() {
|
||
// If we are taking it in the middle of a previous envelope,
|
||
// start to rise from the current level:
|
||
// envelope = - (2 ^ x); ->
|
||
// 2 ^ x = -envelope ->
|
||
// x = log2(-envelope); ->
|
||
double xCurrent = OperatorDataStruct::log2(-envelope);
|
||
x = xCurrent < xMinimumInAttack ? xCurrent : xMinimumInAttack;
|
||
stage = ATTACK;
|
||
}
|
||
|
||
void EnvelopeGenerator::keyOff() {
|
||
if(stage != OFF) stage = RELEASE;
|
||
}
|
||
|
||
double EnvelopeGenerator::dBtoX(double dB) {
|
||
return OperatorDataStruct::log2(-dB);
|
||
}
|
||
|
||
double EnvelopeGenerator::percentageToDB(double percentage) {
|
||
return log10(percentage) * 10.0;
|
||
}
|
||
|
||
double EnvelopeGenerator::percentageToX(double percentage) {
|
||
return dBtoX(percentageToDB(percentage));
|
||
}
|
||
|
||
PhaseGenerator::PhaseGenerator() {
|
||
phase = phaseIncrement = 0;
|
||
}
|
||
|
||
void PhaseGenerator::setFrequency(int f_number, int block, int mult) {
|
||
// This frequency formula is derived from the following equation:
|
||
// f_number = baseFrequency * pow(2,19) / OPL_SAMPLE_RATE / pow(2,block-1);
|
||
double baseFrequency =
|
||
f_number * pow(2.0, block-1) * OPL_SAMPLE_RATE / pow(2.0,19);
|
||
double operatorFrequency = baseFrequency*OperatorDataStruct::multTable[mult];
|
||
|
||
// phase goes from 0 to 1 at
|
||
// period = (1/frequency) seconds ->
|
||
// Samples in each period is (1/frequency)*OPL_SAMPLE_RATE =
|
||
// = OPL_SAMPLE_RATE/frequency ->
|
||
// So the increment in each sample, to go from 0 to 1, is:
|
||
// increment = (1-0) / samples in the period ->
|
||
// increment = 1 / (OPL_SAMPLE_RATE/operatorFrequency) ->
|
||
phaseIncrement = operatorFrequency/OPL_SAMPLE_RATE;
|
||
}
|
||
|
||
double PhaseGenerator::getPhase(OPL3 *OPL3, int vib) {
|
||
if(vib==1)
|
||
// phaseIncrement = (operatorFrequency * vibrato) / OPL_SAMPLE_RATE
|
||
phase += phaseIncrement*OPL3::OPL3Data->vibratoTable[OPL3->dvb][OPL3->vibratoIndex];
|
||
else
|
||
// phaseIncrement = operatorFrequency / OPL_SAMPLE_RATE
|
||
phase += phaseIncrement;
|
||
// Originally clamped phase to [0,1), but that's not needed
|
||
return phase;
|
||
}
|
||
|
||
void PhaseGenerator::keyOn() {
|
||
phase = 0;
|
||
}
|
||
|
||
double RhythmChannel::getChannelOutput(OPL3 *OPL3) {
|
||
double channelOutput = 0, op1Output = 0, op2Output = 0;
|
||
|
||
// Note that, different from the common channel,
|
||
// we do not check to see if the Operator's envelopes are Off.
|
||
// Instead, we always do the calculations,
|
||
// to update the publicly available phase.
|
||
op1Output = op1->getOperatorOutput(OPL3, Operator::noModulator);
|
||
op2Output = op2->getOperatorOutput(OPL3, Operator::noModulator);
|
||
channelOutput = (op1Output + op2Output) / 2;
|
||
|
||
return channelOutput;
|
||
};
|
||
|
||
TopCymbalOperator::TopCymbalOperator(int baseAddress)
|
||
: Operator(baseAddress)
|
||
{ }
|
||
|
||
TopCymbalOperator::TopCymbalOperator()
|
||
: Operator(topCymbalOperatorBaseAddress)
|
||
{ }
|
||
|
||
double TopCymbalOperator::getOperatorOutput(OPL3 *OPL3, double modulator) {
|
||
double highHatOperatorPhase =
|
||
OPL3->highHatOperator.phase * OperatorDataStruct::multTable[OPL3->highHatOperator.mult];
|
||
// The Top Cymbal operator uses its own phase together with the High Hat phase.
|
||
return getOperatorOutput(OPL3, modulator, highHatOperatorPhase);
|
||
}
|
||
|
||
// This method is used here with the HighHatOperator phase
|
||
// as the externalPhase.
|
||
// Conversely, this method is also used through inheritance by the HighHatOperator,
|
||
// now with the TopCymbalOperator phase as the externalPhase.
|
||
double TopCymbalOperator::getOperatorOutput(OPL3 *OPL3, double modulator, double externalPhase) {
|
||
double envelopeInDB = envelopeGenerator.getEnvelope(OPL3, egt, am);
|
||
envelope = EnvelopeFromDB(envelopeInDB);
|
||
|
||
phase = phaseGenerator.getPhase(OPL3, vib);
|
||
|
||
int waveIndex = ws & ((OPL3->_new<<2) + 3);
|
||
double *waveform = OPL3::OperatorData->waveforms[waveIndex];
|
||
|
||
// Empirically tested multiplied phase for the Top Cymbal:
|
||
double carrierPhase = 8 * phase;
|
||
double modulatorPhase = externalPhase;
|
||
double modulatorOutput = getOutput(Operator::noModulator, modulatorPhase, waveform);
|
||
double carrierOutput = getOutput(modulatorOutput, carrierPhase, waveform);
|
||
|
||
int cycles = 4;
|
||
double chopped = (carrierPhase * cycles) /* %cycles */;
|
||
chopped = chopped - floor(chopped / cycles) * cycles;
|
||
if( chopped > 0.1) carrierOutput = 0;
|
||
|
||
return carrierOutput*2;
|
||
}
|
||
|
||
HighHatOperator::HighHatOperator()
|
||
: TopCymbalOperator(highHatOperatorBaseAddress)
|
||
{ }
|
||
|
||
double HighHatOperator::getOperatorOutput(OPL3 *OPL3, double modulator) {
|
||
double topCymbalOperatorPhase =
|
||
OPL3->topCymbalOperator.phase * OperatorDataStruct::multTable[OPL3->topCymbalOperator.mult];
|
||
// The sound output from the High Hat resembles the one from
|
||
// Top Cymbal, so we use the parent method and modify its output
|
||
// accordingly afterwards.
|
||
double operatorOutput = TopCymbalOperator::getOperatorOutput(OPL3, modulator, topCymbalOperatorPhase);
|
||
double randval = rand() / (double)RAND_MAX;
|
||
if(operatorOutput == 0) operatorOutput = randval*envelope;
|
||
return operatorOutput;
|
||
}
|
||
|
||
SnareDrumOperator::SnareDrumOperator()
|
||
: Operator(snareDrumOperatorBaseAddress)
|
||
{ }
|
||
|
||
double SnareDrumOperator::getOperatorOutput(OPL3 *OPL3, double modulator) {
|
||
if(envelopeGenerator.stage == EnvelopeGenerator::OFF) return 0;
|
||
|
||
double envelopeInDB = envelopeGenerator.getEnvelope(OPL3, egt, am);
|
||
envelope = EnvelopeFromDB(envelopeInDB);
|
||
|
||
// If it is in OPL2 mode, use first four waveforms only:
|
||
int waveIndex = ws & ((OPL3->_new<<2) + 3);
|
||
double *waveform = OPL3::OperatorData->waveforms[waveIndex];
|
||
|
||
phase = OPL3->highHatOperator.phase * 2;
|
||
|
||
double operatorOutput = getOutput(modulator, phase, waveform);
|
||
|
||
double randval = rand() / (double)RAND_MAX;
|
||
double noise = randval * envelope;
|
||
|
||
if(operatorOutput/envelope != 1 && operatorOutput/envelope != -1) {
|
||
if(operatorOutput > 0) operatorOutput = noise;
|
||
else if(operatorOutput < 0) operatorOutput = -noise;
|
||
else operatorOutput = 0;
|
||
}
|
||
|
||
return operatorOutput*2;
|
||
}
|
||
|
||
BassDrumChannel::BassDrumChannel(double startvol)
|
||
: Channel2op(bassDrumChannelBaseAddress, startvol, &my_op1, &my_op2),
|
||
my_op1(op1BaseAddress), my_op2(op2BaseAddress)
|
||
{ }
|
||
|
||
double BassDrumChannel::getChannelOutput(OPL3 *OPL3) {
|
||
// Bass Drum ignores first operator, when it is in series.
|
||
if(cnt == 1) op1->ar=0;
|
||
return Channel2op::getChannelOutput(OPL3);
|
||
}
|
||
|
||
void OPL3DataStruct::loadVibratoTable() {
|
||
|
||
// According to the YMF262 datasheet, the OPL3 vibrato repetition rate is 6.1 Hz.
|
||
// According to the YMF278B manual, it is 6.0 Hz.
|
||
// The information that the vibrato table has 8 levels standing 1024 samples each
|
||
// was taken from the emulator by Jarek Burczynski and Tatsuyuki Satoh,
|
||
// with a frequency of 6,06689453125 Hz, what makes sense with the difference
|
||
// in the information on the datasheets.
|
||
|
||
const double semitone = pow(2.0,1/12.0);
|
||
// A cent is 1/100 of a semitone:
|
||
const double cent = pow(semitone, 1/100.0);
|
||
|
||
// When dvb=0, the depth is 7 cents, when it is 1, the depth is 14 cents.
|
||
const double DVB0 = pow(cent,7.0);
|
||
const double DVB1 = pow(cent,14.0);
|
||
int i;
|
||
for(i = 0; i<1024; i++)
|
||
vibratoTable[0][i] = vibratoTable[1][i] = 1;
|
||
for(;i<2048; i++) {
|
||
vibratoTable[0][i] = sqrt(DVB0);
|
||
vibratoTable[1][i] = sqrt(DVB1);
|
||
}
|
||
for(;i<3072; i++) {
|
||
vibratoTable[0][i] = DVB0;
|
||
vibratoTable[1][i] = DVB1;
|
||
}
|
||
for(;i<4096; i++) {
|
||
vibratoTable[0][i] = sqrt(DVB0);
|
||
vibratoTable[1][i] = sqrt(DVB1);
|
||
}
|
||
for(; i<5120; i++)
|
||
vibratoTable[0][i] = vibratoTable[1][i] = 1;
|
||
for(;i<6144; i++) {
|
||
vibratoTable[0][i] = 1/sqrt(DVB0);
|
||
vibratoTable[1][i] = 1/sqrt(DVB1);
|
||
}
|
||
for(;i<7168; i++) {
|
||
vibratoTable[0][i] = 1/DVB0;
|
||
vibratoTable[1][i] = 1/DVB1;
|
||
}
|
||
for(;i<8192; i++) {
|
||
vibratoTable[0][i] = 1/sqrt(DVB0);
|
||
vibratoTable[1][i] = 1/sqrt(DVB1);
|
||
}
|
||
|
||
}
|
||
|
||
void OPL3DataStruct::loadTremoloTable()
|
||
{
|
||
// The tremolo depth is -1 dB when DAM = 0, and -4.8 dB when DAM = 1.
|
||
static const double tremoloDepth[] = {-1, -4.8};
|
||
|
||
// According to the YMF278B manual's OPL3 section graph,
|
||
// the tremolo waveform is not
|
||
// \ / a sine wave, but a single triangle waveform.
|
||
// \ / Thus, the period to achieve the tremolo depth is T/2, and
|
||
// \ / the increment in each T/2 section uses a frequency of 2*f.
|
||
// \/ Tremolo varies from 0 dB to depth, to 0 dB again, at frequency*2:
|
||
const double tremoloIncrement[] = {
|
||
calculateIncrement(tremoloDepth[0],0,1/(2*tremoloFrequency)),
|
||
calculateIncrement(tremoloDepth[1],0,1/(2*tremoloFrequency))
|
||
};
|
||
|
||
int tremoloTableLength = (int)(OPL_SAMPLE_RATE/tremoloFrequency);
|
||
|
||
// This is undocumented. The tremolo starts at the maximum attenuation,
|
||
// instead of at 0 dB:
|
||
tremoloTable[0][0] = tremoloDepth[0];
|
||
tremoloTable[1][0] = tremoloDepth[1];
|
||
int counter = 0;
|
||
// The first half of the triangle waveform:
|
||
while(tremoloTable[0][counter]<0) {
|
||
counter++;
|
||
tremoloTable[0][counter] = tremoloTable[0][counter-1] + tremoloIncrement[0];
|
||
tremoloTable[1][counter] = tremoloTable[1][counter-1] + tremoloIncrement[1];
|
||
}
|
||
// The second half of the triangle waveform:
|
||
while(tremoloTable[0][counter]>tremoloDepth[0] && counter<tremoloTableLength-1) {
|
||
counter++;
|
||
tremoloTable[0][counter] = tremoloTable[0][counter-1] - tremoloIncrement[0];
|
||
tremoloTable[1][counter] = tremoloTable[1][counter-1] - tremoloIncrement[1];
|
||
}
|
||
}
|
||
|
||
void OperatorDataStruct::loadWaveforms() {
|
||
int i;
|
||
// 1st waveform: sinusoid.
|
||
double theta = 0, thetaIncrement = 2*OPL_PI / 1024;
|
||
|
||
for(i=0, theta=0; i<1024; i++, theta += thetaIncrement)
|
||
waveforms[0][i] = sin(theta);
|
||
|
||
double *sineTable = waveforms[0];
|
||
// 2nd: first half of a sinusoid.
|
||
for(i=0; i<512; i++) {
|
||
waveforms[1][i] = sineTable[i];
|
||
waveforms[1][512+i] = 0;
|
||
}
|
||
// 3rd: double positive sinusoid.
|
||
for(i=0; i<512; i++)
|
||
waveforms[2][i] = waveforms[2][512+i] = sineTable[i];
|
||
// 4th: first and third quarter of double positive sinusoid.
|
||
for(i=0; i<256; i++) {
|
||
waveforms[3][i] = waveforms[3][512+i] = sineTable[i];
|
||
waveforms[3][256+i] = waveforms[3][768+i] = 0;
|
||
}
|
||
// 5th: first half with double frequency sinusoid.
|
||
for(i=0; i<512; i++) {
|
||
waveforms[4][i] = sineTable[i*2];
|
||
waveforms[4][512+i] = 0;
|
||
}
|
||
// 6th: first half with double frequency positive sinusoid.
|
||
for(i=0; i<256; i++) {
|
||
waveforms[5][i] = waveforms[5][256+i] = sineTable[i*2];
|
||
waveforms[5][512+i] = waveforms[5][768+i] = 0;
|
||
}
|
||
// 7th: square wave
|
||
for(i=0; i<512; i++) {
|
||
waveforms[6][i] = 1;
|
||
waveforms[6][512+i] = -1;
|
||
}
|
||
// 8th: exponential
|
||
double x;
|
||
double xIncrement = 1 * 16.0 / 256.0;
|
||
for(i=0, x=0; i<512; i++, x+=xIncrement) {
|
||
waveforms[7][i] = pow(2.0,-x);
|
||
waveforms[7][1023-i] = -pow(2.0,-(x + 1/16.0));
|
||
}
|
||
}
|
||
|
||
void OperatorDataStruct::loaddBPowTable()
|
||
{
|
||
for (int i = 0; i < DB_TABLE_SIZE; ++i)
|
||
{
|
||
dbpow[i] = pow(10.0, -(i / DB_TABLE_RES) / 10.0);
|
||
}
|
||
}
|
||
|
||
void OperatorDataStruct::loadAttackTable()
|
||
{
|
||
for (int i = 0; i < ATTACK_TABLE_SIZE; ++i)
|
||
{
|
||
attackTable[i] = -pow(2.0, ATTACK_MIN + i * ATTACK_RES);
|
||
}
|
||
}
|
||
|
||
void OPL3::Reset()
|
||
{
|
||
}
|
||
|
||
void OPL3::WriteReg(int reg, int v)
|
||
{
|
||
write(reg >> 8, reg & 0xFF, v);
|
||
}
|
||
|
||
void OPL3::SetPanning(int c, float left, float right)
|
||
{
|
||
if (FullPan)
|
||
{
|
||
Channel *channel;
|
||
|
||
if (c < 9)
|
||
{
|
||
channel = channels[0][c];
|
||
}
|
||
else
|
||
{
|
||
channel = channels[1][c - 9];
|
||
}
|
||
channel->leftPan = left;
|
||
channel->rightPan = right;
|
||
}
|
||
}
|
||
|
||
} // JavaOPL3
|
||
|
||
OPLEmul *JavaOPLCreate(bool stereo)
|
||
{
|
||
return new JavaOPL3::OPL3(stereo);
|
||
}
|