package org.jpc.emulator.peripheral;
public class DbOPL
{
// :TODO: look for ~ and make sure they generate the mask of the right size
// Java 1.4 does not have Math.log10
static private double log10(double d) {
return Math.log(d) / Math.log(10);
}
//Use 8 handlers based on a small logatirmic wavetabe and an exponential table for volume
static private final int WAVE_HANDLER = 10;
//Use a logarithmic wavetable with an exponential table for volume
static private final int WAVE_TABLELOG = 11;
//Use a linear wavetable with a multiply table for volume
static private final int WAVE_TABLEMUL = 12;
//Select the type of wave generator routine
static private final int DBOPL_WAVE = WAVE_TABLEMUL;
static private final double OPLRATE = (14318180.0 / 288.0);
static private final int TREMOLO_TABLE = 52;
//Try to use most precision for frequencies
//Else try to keep different waves in synch
static private final boolean WAVE_PRECISION = false;
// #ifndef WAVE_PRECISION
// //Wave bits available in the top of the 32bit range
// //Original adlib uses 10.10, we use 10.22
// static private final int WAVE_BITS 10
// #else
// //Need some extra bits at the top to have room for octaves and frequency multiplier
// //We support to 8 times lower rate
// //128 * 15 * 8 = 15350, 2^13.9, so need 14 bits
// static private final int WAVE_BITS 14
// #endif
static private final int WAVE_BITS = WAVE_PRECISION?14:10;
static private final int WAVE_SH = ( 32 - WAVE_BITS );
static private final int WAVE_MASK = ( ( 1 << WAVE_SH ) - 1 );
//Use the same accuracy as the waves
static private final int LFO_SH = ( WAVE_SH - 10 );
//LFO is controlled by our tremolo 256 sample limit
static private final int LFO_MAX = ( 256 << ( LFO_SH ) );
//Maximum amount of attenuation bits
//Envelope goes to 511, 9 bits
// #if (DBOPL_WAVE == WAVE_TABLEMUL )
// //Uses the value directly
// static private final int ENV_BITS ( 9 )
// #else
// //Add 3 bits here for more accuracy and would have to be shifted up either way
// static private final int ENV_BITS ( 9 )
// #endif
static private final int ENV_BITS = 9;
//Limits of the envelope with those bits and when the envelope goes silent
static private final int ENV_MIN = 0;
static private final int ENV_EXTRA = ( ENV_BITS - 9 );
static private final int ENV_MAX = ( 511 << ENV_EXTRA );
static private final int ENV_LIMIT = ( ( 12 * 256) >> ( 3 - ENV_EXTRA ) );
static private boolean ENV_SILENT(int _X_ ) {return ( (_X_) >= ENV_LIMIT ); }
//Attack/decay/release rate counter shift
static private final int RATE_SH = 24;
static private final int RATE_MASK = ( ( 1 << RATE_SH ) - 1 );
//Has to fit within 16bit lookuptable
static private final int MUL_SH = 16;
//Check some ranges
// #if ENV_EXTRA > 3
// #error Too many envelope bits
// #endif
//How much to substract from the base value for the final attenuation
static private final /*Bit8u*/byte[] KslCreateTable = {
//0 will always be be lower than 7 * 8
64, 32, 24, 19,
16, 12, 11, 10,
8, 6, 5, 4,
3, 2, 1, 0,
};
static final private /*Bit8u*/byte[] FreqCreateTable = {
1, 2, 4, 6, 8, 10, 12, 14,
16, 18, 20, 20, 24, 24, 30, 30
};
//We're not including the highest attack rate, that gets a special value
static final private /*Bit8u*/byte[] AttackSamplesTable = {
69, 55, 46, 40,
35, 29, 23, 20,
19, 15, 11, 10,
9
};
//On a real opl these values take 8 samples to reach and are based upon larger tables
static final private /*Bit8u*/byte[] EnvelopeIncreaseTable = {
4, 5, 6, 7,
8, 10, 12, 14,
16, 20, 24, 28,
32,
};
static /*Bit16u*/int[] ExpTable;
static /*Bit16u*/int[] SinTable;
static {
if ( DBOPL_WAVE == WAVE_HANDLER || DBOPL_WAVE == WAVE_TABLELOG)
ExpTable = new int[256];
if ( DBOPL_WAVE == WAVE_HANDLER )
SinTable = new int[512]; //PI table used by WAVEHANDLER
if ( DBOPL_WAVE > WAVE_HANDLER )
WaveTable = new short[8*512];
if ( DBOPL_WAVE == WAVE_TABLEMUL )
MulTable = new int[384];
}
// #if ( DBOPL_WAVE > WAVE_HANDLER )
//Layout of the waveform table in 512 entry intervals
//With overlapping waves we reduce the table to half it's size
// | |//\\|____|WAV7|//__|/\ |____|/\/\|
// |\\//| | |WAV7| | \/| | |
// |06 |0126|17 |7 |3 |4 |4 5 |5 |
//6 is just 0 shifted and masked
static private final/*Bit16s*/short[] WaveTable;
//Distance into WaveTable the wave starts
static private final /*Bit16u*/short[] WaveBaseTable = {
0x000, 0x200, 0x200, 0x800,
0xa00, 0xc00, 0x100, 0x400,
};
//Mask the counter with this
static private final /*Bit16u*/short[] WaveMaskTable = {
1023, 1023, 511, 511,
1023, 1023, 512, 1023,
};
//Where to start the counter on at keyon
static private final /*Bit16u*/short[] WaveStartTable = {
512, 0, 0, 0,
0, 512, 512, 256,
};
// #endif
//#if ( DBOPL_WAVE == WAVE_TABLEMUL )
private final static /*Bit16u*/int[] MulTable;
//#endif
private final static /*Bit8u*/short[] KslTable = new short[8*16];
private final static /*Bit8u*/short[] TremoloTable = new short[TREMOLO_TABLE];
//Start of a channel behind the chip struct start
private final static /*Bit16u*/int[] ChanOffsetTable = new int[32];
//Start of an operator behind the chip struct start
private final static /*Bit16u*/int[] OpOffsetTable = new int[64];
//The lower bits are the shift of the operator vibrato value
//The highest bit is right shifted to generate -1 or 0 for negation
//So taking the highest input value of 7 this gives 3, 7, 3, 0, -3, -7, -3, 0
static private final /*Bit8s*/byte[] VibratoTable = {
1 - 0x00, 0 - 0x00, 1 - 0x00, 30 - 0x00,
1 - 0x80, 0 - 0x80, 1 - 0x80, 30 - 0x80
};
//Shift strength for the ksl value determined by ksl strength
static private final /*Bit8u*/byte[] KslShiftTable = {
31,1,2,0
};
// #if (DBOPL_WAVE == WAVE_HANDLER)
// typedef /*Bits*/int ( DB_FASTCALL *WaveHandler) ( /*Bitu*/long i, /*Bitu*/long volume );
// #endif
static private interface WaveHandler {
public /*Bits*/int call(int i, int volume);
}
// typedef /*Bits*/int ( DBOPL::Operator::*VolumeHandler) ( );
// static private interface VolumeHandler {
// public /*Bits*/int call();
// }
// typedef Channel* ( DBOPL::Channel::*SynthHandler) ( Chip* chip, /*Bit32u*/long samples, /*Bit32s*/int* output );
//Different synth modes that can generate blocks of data
static private final int sm2AM = 0;
static private final int sm2FM = 1;
static private final int sm3AM = 2;
static private final int sm3FM = 3;
static private final int sm4Start = 4;
static private final int sm3FMFM = 5;
static private final int sm3AMFM = 6;
static private final int sm3FMAM = 7;
static private final int sm3AMAM = 8;
static private final int sm6Start = 9;
static private final int sm2Percussion = 10;
static private final int sm3Percussion = 11;
static private int SynthMode;
//Shifts for the values contained in chandata variable
static private final int SHIFT_KSLBASE = 16;
static private final int SHIFT_KEYCODE = 24;
private static class Operator {
//Masks for operator 20 values
static public final int MASK_KSR = 0x10;
static public final int MASK_SUSTAIN = 0x20;
static public final int MASK_VIBRATO = 0x40;
static public final int MASK_TREMOLO = 0x80;
static public final int OFF = 0;
static public final int RELEASE = 1;
static public final int SUSTAIN = 2;
static public final int DECAY = 3;
static public final int ATTACK = 4;
public int State;
int volHandlerParam;
// #if (DBOPL_WAVE == WAVE_HANDLER)
WaveHandler waveHandler; //Routine that generate a wave
// #else
/*Bit16s*/short[] waveBase;
int waveBaseOff;
/*Bit32u*/int waveMask;
/*Bit32u*/long waveStart;
// #endif
/*Bit32u*/long waveIndex; //WAVE_BITS shifted counter of the frequency index
/*Bit32u*/int waveAdd; //The base frequency without vibrato
/*Bit32u*/int waveCurrent; //waveAdd + vibratao
/*Bit32u*/int chanData; //Frequency/octave and derived data coming from whatever channel controls this
/*Bit32u*/int freqMul; //Scale channel frequency with this, TODO maybe remove?
/*Bit32u*/int vibrato; //Scaled up vibrato strength
/*Bit32s*/int sustainLevel; //When stopping at sustain level stop here
/*Bit32s*/int totalLevel; //totalLevel is added to every generated volume
/*Bit32u*/int currentLevel; //totalLevel + tremolo
/*Bit32s*/int volume; //The currently active volume
/*Bit32u*/long attackAdd; //Timers for the different states of the envelope
/*Bit32u*/long decayAdd;
/*Bit32u*/long releaseAdd;
/*Bit32u*/long rateIndex; //Current position of the evenlope
/*Bit8u*/short rateZero; ///*Bits*/int for the different states of the envelope having no changes
/*Bit8u*/short keyOn; //Bitmask of different values that can generate keyon
//Registers, also used to check for changes
/*Bit8u*/short reg20, reg40, reg60, reg80, regE0;
//Active part of the envelope we're in
/*Bit8u*/short state;
//0xff when tremolo is enabled
/*Bit8u*/byte tremoloMask;
//Strength of the vibrato
/*Bit8u*/short vibStrength;
//Keep track of the calculated KSR so we can check for changes
/*Bit8u*/short ksr;
private void SetState(/*Bit8u*/int s) {
state = (short)s;
volHandlerParam = s;
}
//We zero out when rate == 0
private void UpdateAttack(Chip chip) {
/*Bit8u*/int rate = reg60 >> 4;
if (rate!=0) {
/*Bit8u*/int val = (rate << 2) + ksr;
attackAdd = chip.attackRates[val];
rateZero &= ~(1 << ATTACK);
} else {
attackAdd = 0;
rateZero |= (1 << ATTACK);
}
}
private void UpdateRelease(Chip chip ) {
/*Bit8u*/int rate = reg80 & 0xf;
if (rate!=0) {
/*Bit8u*/int val = (rate << 2) + ksr;
releaseAdd = chip.linearRates[val];
rateZero &= ~(1 << RELEASE);
if ((reg20 & MASK_SUSTAIN)==0) {
rateZero &= ~( 1 << SUSTAIN );
}
} else {
rateZero |= (1 << RELEASE);
releaseAdd = 0;
if ((reg20 & MASK_SUSTAIN)==0) {
rateZero |= ( 1 << SUSTAIN );
}
}
}
private void UpdateDecay(Chip chip) {
/*Bit8u*/int rate = reg60 & 0xf;
if (rate!=0) {
/*Bit8u*/int val = (rate << 2) + ksr;
decayAdd = chip.linearRates[val];
rateZero &= ~(1 << DECAY);
} else {
decayAdd = 0;
rateZero |= (1 << DECAY);
}
}
public void UpdateAttenuation() {
/*Bit8u*/short kslBase = (/*Bit8u*/short)((chanData >> SHIFT_KSLBASE) & 0xff);
/*Bit32u*/int tl = reg40 & 0x3f;
/*Bit8u*/short kslShift = KslShiftTable[ reg40 >> 6 ];
//Make sure the attenuation goes to the right bits
totalLevel = tl << ( ENV_BITS - 7 ); //Total level goes 2 bits below max
totalLevel += ( kslBase << ENV_EXTRA ) >> kslShift;
}
public void UpdateRates(Chip chip) {
//Mame seems to reverse this where enabling ksr actually lowers
//the rate, but pdf manuals says otherwise?
/*Bit8u*/short newKsr = (/*Bit8u*/short)((chanData >> SHIFT_KEYCODE) & 0xff);
if ((reg20 & MASK_KSR)==0) {
newKsr >>= 2;
}
if ( ksr == newKsr )
return;
ksr = newKsr;
UpdateAttack(chip);
UpdateDecay(chip);
UpdateRelease(chip);
}
public void UpdateFrequency() {
/*Bit32u*/int freq = chanData & (( 1 << 10 ) - 1);
/*Bit32u*/long block = (chanData >> 10) & 0xff;
if (WAVE_PRECISION) {
block = 7 - block;
waveAdd = ( freq * freqMul ) >> block;
} else {
waveAdd = ( freq << block ) * freqMul;
}
if ((reg20 & MASK_VIBRATO)!=0) {
vibStrength = (/*Bit8u*/short)(freq >> 7);
if (WAVE_PRECISION)
vibrato = ( vibStrength * freqMul ) >> block;
else
vibrato = ( vibStrength << block ) * freqMul;
} else {
vibStrength = 0;
vibrato = 0;
}
}
public void Write20(Chip chip, /*Bit8u*/short val) {
/*Bit8u*/int change = (reg20 ^ val );
if (change==0)
return;
reg20 = val;
//Shift the tremolo bit over the entire register, saved a branch, YES!
tremoloMask = (byte)((/*Bit8s*/byte)(val) >> 7);
tremoloMask &= ~(( 1 << ENV_EXTRA ) -1);
//Update specific features based on changes
if ((change & MASK_KSR)!=0) {
UpdateRates( chip );
}
//With sustain enable the volume doesn't change
if ((reg20 & MASK_SUSTAIN)!=0 || releaseAdd==0) {
rateZero |= ( 1 << SUSTAIN );
} else {
rateZero &= ~( 1 << SUSTAIN );
}
//Frequency multiplier or vibrato changed
if ((change & (0xf | MASK_VIBRATO))!=0) {
freqMul = chip.freqMul[ val & 0xf ];
UpdateFrequency();
}
}
public void Write40(Chip chip, /*Bit8u*/short val) {
if ((reg40 ^ val )==0)
return;
reg40 = val;
UpdateAttenuation( );
}
public void Write60(Chip chip, /*Bit8u*/short val) {
/*Bit8u*/int change = reg60 ^ val;
reg60 = val;
if ((change & 0x0f)!=0) {
UpdateDecay( chip );
}
if ((change & 0xf0)!=0) {
UpdateAttack( chip );
}
}
public void Write80(Chip chip, /*Bit8u*/short val) {
/*Bit8u*/int change = (reg80 ^ val );
if (change==0)
return;
reg80 = val;
/*Bit8u*/int sustain = val >> 4;
//Turn 0xf into 0x1f
sustain |= ( sustain + 1) & 0x10;
sustainLevel = sustain << ( ENV_BITS - 5 );
if ((change & 0x0f)!=0) {
UpdateRelease( chip );
}
}
public void WriteE0(Chip chip, /*Bit8u*/short val) {
if ((regE0 ^ val)==0)
return;
//in opl3 mode you can always selet 7 waveforms regardless of waveformselect
/*Bit8u*/int waveForm = val & ( ( 0x3 & chip.waveFormMask ) | (0x7 & chip.opl3Active ) );
regE0 = val;
if ( DBOPL_WAVE == WAVE_HANDLER ) {
waveHandler = WaveHandlerTable[ waveForm ];
} else {
waveBase = WaveTable;
waveBaseOff = WaveBaseTable[ waveForm ];
waveStart = WaveStartTable[ waveForm ] << WAVE_SH;
waveMask = WaveMaskTable[ waveForm ];
}
}
public boolean Silent() {
if ( !ENV_SILENT( totalLevel + volume ) )
return false;
if ((rateZero & ( 1 << state ))==0)
return false;
return true;
}
public void Prepare(Chip chip) {
currentLevel = totalLevel + (chip.tremoloValue & tremoloMask);
waveCurrent = waveAdd;
if ((vibStrength >> chip.vibratoShift)!=0) {
/*Bit32s*/int add = vibrato >> chip.vibratoShift;
//Sign extend over the shift value
/*Bit32s*/int neg = chip.vibratoSign;
//Negate the add with -1 or 0
add = ( add ^ neg ) - neg;
waveCurrent += add;
}
}
public void KeyOn( /*Bit8u*/int mask) {
if (keyOn==0) {
//Restart the frequency generator
if ( DBOPL_WAVE > WAVE_HANDLER )
waveIndex = waveStart;
else
waveIndex = 0;
rateIndex = 0;
SetState( ATTACK );
}
keyOn |= mask;
}
public void KeyOff( /*Bit8u*/int mask) {
keyOn &= ~mask;
if (keyOn==0) {
if (state != OFF) {
SetState(RELEASE);
}
}
}
//template< State state>
public /*Bits*/int TemplateVolume(int yes) {
/*Bit32s*/int vol = volume;
/*Bit32s*/int change;
switch ( yes ) {
case OFF:
return ENV_MAX;
case ATTACK:
change = RateForward( attackAdd );
if (change==0)
return vol;
vol += ( (~vol) * change ) >> 3;
if ( vol < ENV_MIN ) {
volume = ENV_MIN;
rateIndex = 0;
SetState( DECAY );
return ENV_MIN;
}
break;
case DECAY:
vol += RateForward( decayAdd );
if (vol >= sustainLevel) {
//Check if we didn't overshoot max attenuation, then just go off
if (vol >= ENV_MAX) {
volume = ENV_MAX;
SetState( OFF );
return ENV_MAX;
}
//Continue as sustain
rateIndex = 0;
SetState( SUSTAIN );
}
break;
case SUSTAIN:
if ((reg20 & MASK_SUSTAIN)!=0) {
return vol;
}
//In sustain phase, but not sustaining, do regular release
case RELEASE:
vol += RateForward( releaseAdd );;
if (vol >= ENV_MAX) {
volume = ENV_MAX;
SetState( OFF );
return ENV_MAX;
}
break;
}
volume = vol;
return vol;
}
public /*Bit32s*/int RateForward( /*Bit32u*/long add ) {
rateIndex += add;
/*Bit32s*/int ret = (int)(rateIndex >> RATE_SH);
rateIndex = rateIndex & RATE_MASK;
return ret;
}
public /*Bitu*/int ForwardWave() {
waveIndex += waveCurrent;
return (int)(waveIndex >> WAVE_SH);
}
public /*Bitu*/int ForwardVolume() {
return currentLevel + TemplateVolume(volHandlerParam);
}
public /*Bits*/int GetSample( /*Bits*/int modulation ) {
/*Bitu*/int vol = ForwardVolume();
if ( ENV_SILENT( vol ) ) {
//Simply forward the wave
waveIndex += waveCurrent;
return 0;
} else {
/*Bitu*/int index= ForwardWave();
index += modulation;
return GetWave( index, vol );
}
}
public /*Bits*/int GetWave(/*Bitu*/int index, /*Bitu*/int vol) {
if ( DBOPL_WAVE == WAVE_HANDLER )
return waveHandler.call( index, vol << ( 3 - ENV_EXTRA ) );
else if ( DBOPL_WAVE == WAVE_TABLEMUL )
return (waveBase[waveBaseOff + (index & waveMask) ] * MulTable[ vol >> ENV_EXTRA ]) >> MUL_SH;
else if ( DBOPL_WAVE == WAVE_TABLELOG ) {
/*Bit32s*/int wave = waveBase[ waveBaseOff + (index & waveMask) ];
/*Bit32u*/int total = ( wave & 0x7fff ) + vol << ( 3 - ENV_EXTRA );
/*Bit32s*/int sig = ExpTable[ total & 0xff ];
/*Bit32u*/long exp = total >> 8;
/*Bit32s*/int neg = wave >> 16;
return ((sig ^ neg) - neg) >> exp;
} else {
throw new RuntimeException("No valid wave routine");
}
}
public Operator() {
chanData = 0;
freqMul = 0;
waveIndex = 0;
waveAdd = 0;
waveCurrent = 0;
keyOn = 0;
ksr = 0;
reg20 = 0;
reg40 = 0;
reg60 = 0;
reg80 = 0;
regE0 = 0;
SetState( OFF );
rateZero = (1 << OFF);
sustainLevel = ENV_MAX;
currentLevel = ENV_MAX;
totalLevel = ENV_MAX;
volume = ENV_MAX;
releaseAdd = 0;
}
}
private static class Channel {
int index;
Chip chip;
Channel(Chip chip, int index) {
this.chip = chip;
this.index = index;
old[0] = old[1] = 0;
chanData = 0;
regB0 = 0;
regC0 = 0;
maskLeft = -1;
maskRight = -1;
feedback = 31;
fourMask = 0;
synthHandlerMode = sm2FM;
for (int i=0;i<op.length;i++) {
op[i] = new Operator();
}
}
Operator[] op = new Operator[2];
Operator Op(/*Bitu*/int index) {
return chip.chan[this.index+ (index >> 1) ].op[index & 1];
}
int synthHandlerMode;
/*Bit32u*/int chanData; //Frequency/octave and derived values
/*Bit32s*/int[] old = new int[2]; //Old data for feedback
/*Bit8u*/int feedback; //Feedback shift
/*Bit8u*/short regB0; //Register values to check for changes
/*Bit8u*/short regC0;
//This should correspond with reg104, bit 6 indicates a Percussion channel, bit 7 indicates a silent channel
/*Bit8u*/short fourMask;
/*Bit8s*/byte maskLeft; //Sign extended values for both channel's panning
/*Bit8s*/byte maskRight;
//Forward the channel data to the operators of the channel
void SetChanData(Chip chip, /*Bit32u*/int data ) {
/*Bit32u*/long change = chanData ^ data;
chanData = data;
Op(0).chanData = data;
Op(1).chanData = data;
//Since a frequency update triggered this, always update frequency
Op(0).UpdateFrequency();
Op(1).UpdateFrequency();
if ((change & ( 0xff << SHIFT_KSLBASE ))!=0) {
Op( 0 ).UpdateAttenuation();
Op( 1 ).UpdateAttenuation();
}
if ((change & ( 0xff << SHIFT_KEYCODE))!=0) {
Op( 0 ).UpdateRates( chip );
Op( 1 ).UpdateRates( chip );
}
}
//Change in the chandata, check for new values and if we have to forward to operators
void UpdateFrequency(Chip chip, /*Bit8u*/int fourOp ) {
//Extrace the frequency bits
/*Bit32u*/int data = chanData & 0xffff;
/*Bit32u*/long kslBase = KslTable[ data >> 6 ];
/*Bit32u*/long keyCode = ( data & 0x1c00) >> 9;
if ((chip.reg08 & 0x40)!=0) {
keyCode |= ( data & 0x100)>>8; /* notesel == 1 */
} else {
keyCode |= ( data & 0x200)>>9; /* notesel == 0 */
}
//Add the keycode and ksl into the highest bits of chanData
data |= (keyCode << SHIFT_KEYCODE) | ( kslBase << SHIFT_KSLBASE );
SetChanData( chip, data );
if ((fourOp & 0x3f)!=0) {
chip.chan[index+1].SetChanData( chip, data );
}
}
void WriteA0(Chip chip, /*Bit8u*/int val) {
/*Bit8u*/int fourOp = chip.reg104 & chip.opl3Active & fourMask;
//Don't handle writes to silent fourop channels
if ( fourOp > 0x80 )
return;
/*Bit32u*/long change = (chanData ^ val ) & 0xff;
if (change!=0) {
chanData ^= change;
UpdateFrequency(chip, fourOp);
}
}
void WriteB0(Chip chip, /*Bit8u*/short val) {
/*Bit8u*/int fourOp = chip.reg104 & chip.opl3Active & fourMask;
//Don't handle writes to silent fourop channels
if ( fourOp > 0x80 )
return;
/*Bitu*/long change = (chanData ^ ( val << 8 ) ) & 0x1f00;
if (change!=0) {
chanData ^= change;
UpdateFrequency( chip, fourOp );
}
//Check for a change in the keyon/off state
if ((( val ^ regB0) & 0x20)==0)
return;
regB0 = val;
if ((val & 0x20)!=0) {
Op(0).KeyOn( 0x1 );
Op(1).KeyOn( 0x1 );
if ((fourOp & 0x3f)!=0) {
chip.chan[index+1].Op(0).KeyOn( 1 );
chip.chan[index+1].Op(1).KeyOn( 1 );
}
} else {
Op(0).KeyOff( 0x1 );
Op(1).KeyOff( 0x1 );
if ((fourOp & 0x3f)!=0) {
chip.chan[index+1].Op(0).KeyOff( 1 );
chip.chan[index+1].Op(1).KeyOff( 1 );
}
}
}
void WriteC0(Chip chip, /*Bit8u*/short val ) {
/*Bit8u*/int change = val ^ regC0;
if (change==0)
return;
regC0 = val;
feedback = ( val >> 1 ) & 7;
if (feedback!=0) {
//We shift the input to the right 10 bit wave index value
feedback = 9 - feedback;
} else {
feedback = 31;
}
//Select the new synth mode
if (chip.opl3Active!=0) {
//4-op mode enabled for this channel
if (((chip.reg104 & fourMask) & 0x3f)!=0) {
Channel chan0, chan1;
//Check if it's the 2nd channel in a 4-op
if ((fourMask & 0x80 )==0) {
chan0 = this;
chan1 = chip.chan[index+1];
} else {
chan0 = chip.chan[index-1];
chan1 = this;
}
/*Bit8u*/int synth = ( (chan0.regC0 & 1) << 0 )| (( chan1.regC0 & 1) << 1 );
switch ( synth ) {
case 0:
chan0.synthHandlerMode = sm3FMFM;
break;
case 1:
chan0.synthHandlerMode = sm3AMFM;
break;
case 2:
chan0.synthHandlerMode = sm3FMAM;
break;
case 3:
chan0.synthHandlerMode = sm3AMAM;
break;
}
//Disable updating percussion channels
} else if ((fourMask & 0x40)!=0 && (chip.regBD & 0x20)!=0) {
//Regular dual op, am or fm
} else if ((val & 1)!=0) {
synthHandlerMode = sm3AM;
} else {
synthHandlerMode = sm3FM;
}
maskLeft = ( val & 0x10 )!=0 ? (byte)-1 : 0;
maskRight = ( val & 0x20 )!=0 ? (byte)-1 : 0;
//opl2 active
} else {
//Disable updating percussion channels
if ( (fourMask & 0x40)!=0 && (chip.regBD & 0x20)!=0) {
//Regular dual op, am or fm
} else if ((val & 1)!=0) {
synthHandlerMode = sm2AM;
} else {
synthHandlerMode = sm2FM;
}
}
}
void ResetC0(Chip chip ) {
/*Bit8u*/short val = regC0;
regC0 ^= 0xff;
WriteC0(chip, val);
}
//call this for the first channel
void GeneratePercussion(boolean opl3Mode, Chip chip, /*Bit32s*/int[] output, int offset ) {
Channel chan = this;
//BassDrum
/*Bit32s*/int mod = (/*Bit32u*/int)((old[0] + old[1])) >> feedback;
old[0] = old[1];
old[1] = Op(0).GetSample( mod );
//When bassdrum is in AM mode first operator is ignoed
if ((chan.regC0 & 1)!=0) {
mod = 0;
} else {
mod = old[0];
}
/*Bit32s*/int sample = Op(1).GetSample(mod);
//Precalculate stuff used by other outputs
/*Bit32u*/int noiseBit = chip.ForwardNoise() & 0x1;
/*Bit32u*/int c2 = Op(2).ForwardWave();
/*Bit32u*/int c5 = Op(5).ForwardWave();
/*Bit32u*/int phaseBit = (((c2 & 0x88) ^ ((c2<<5) & 0x80))!=0 | ((c5 ^ (c5<<2)) & 0x20)!=0) ? 0x02 : 0x00;
//Hi-Hat
/*Bit32u*/int hhVol = Op(2).ForwardVolume();
if ( !ENV_SILENT( hhVol ) ) {
/*Bit32u*/int hhIndex = (phaseBit<<8) | (0x34 << ( phaseBit ^ (noiseBit << 1 )));
sample += Op(2).GetWave( hhIndex, hhVol );
}
//Snare Drum
/*Bit32u*/int sdVol = Op(3).ForwardVolume();
if ( !ENV_SILENT( sdVol ) ) {
/*Bit32u*/int sdIndex = ( 0x100 + (c2 & 0x100) ) ^ ( noiseBit << 8 );
sample += Op(3).GetWave( sdIndex, sdVol );
}
//Tom-tom
sample += Op(4).GetSample( 0 );
//Top-Cymbal
/*Bit32u*/int tcVol = Op(5).ForwardVolume();
if ( !ENV_SILENT( tcVol ) ) {
/*Bit32u*/int tcIndex = (1 + phaseBit) << 8;
sample += Op(5).GetWave( tcIndex, tcVol );
}
sample <<= 1;
if ( opl3Mode ) {
output[offset] += sample;
output[offset+1] += sample;
} else {
output[offset] += sample;
}
}
//Generate blocks of data in specific modes
Channel BlockTemplate(int mode, Chip chip, /*Bit32u*/long samples, /*Bit32s*/int[] output, int offset) {
switch( mode ) {
case sm2AM:
case sm3AM:
if ( Op(0).Silent() && Op(1).Silent() ) {
old[0] = old[1] = 0;
return chip.chan[index+1];
}
break;
case sm2FM:
case sm3FM:
if ( Op(1).Silent() ) {
old[0] = old[1] = 0;
return chip.chan[index+1];
}
break;
case sm3FMFM:
if ( Op(3).Silent() ) {
old[0] = old[1] = 0;
return chip.chan[index+2];
}
break;
case sm3AMFM:
if ( Op(0).Silent() && Op(3).Silent() ) {
old[0] = old[1] = 0;
return chip.chan[index+2];
}
break;
case sm3FMAM:
if ( Op(1).Silent() && Op(3).Silent() ) {
old[0] = old[1] = 0;
return chip.chan[index+2];
}
break;
case sm3AMAM:
if ( Op(0).Silent() && Op(2).Silent() && Op(3).Silent() ) {
old[0] = old[1] = 0;
return chip.chan[index+2];
}
break;
}
//Init the operators with the the current vibrato and tremolo values
Op( 0 ).Prepare( chip );
Op( 1 ).Prepare( chip );
if ( mode > sm4Start ) {
Op( 2 ).Prepare( chip );
Op( 3 ).Prepare( chip );
}
if ( mode > sm6Start ) {
Op( 4 ).Prepare( chip );
Op( 5 ).Prepare( chip );
}
for ( /*Bitu*/int i = 0; i < samples; i++ ) {
//Early out for percussion handlers
if ( mode == sm2Percussion ) {
GeneratePercussion(false, chip, output, offset+i );
continue; //Prevent some unitialized value bitching
} else if ( mode == sm3Percussion ) {
GeneratePercussion(true, chip, output, offset+i * 2 );
continue; //Prevent some unitialized value bitching
}
//Do unsigned shift so we can shift out all bits but still stay in 10 bit range otherwise
/*Bit32s*/int mod = (/*Bit32u*/int)((old[0] + old[1])) >>> feedback;
old[0] = old[1];
old[1] = Op(0).GetSample( mod );
/*Bit32s*/int sample=0;
/*Bit32s*/int out0 = old[0];
if ( mode == sm2AM || mode == sm3AM ) {
sample = out0 + Op(1).GetSample( 0 );
} else if ( mode == sm2FM || mode == sm3FM ) {
sample = Op(1).GetSample( out0 );
} else if ( mode == sm3FMFM ) {
/*Bits*/int next = Op(1).GetSample( out0 );
next = Op(2).GetSample( next );
sample = Op(3).GetSample( next );
} else if ( mode == sm3AMFM ) {
sample = out0;
/*Bits*/int next = Op(1).GetSample( 0 );
next = Op(2).GetSample( next );
sample += Op(3).GetSample( next );
} else if ( mode == sm3FMAM ) {
sample = Op(1).GetSample( out0 );
/*Bits*/int next = Op(2).GetSample( 0 );
sample += Op(3).GetSample( next );
} else if ( mode == sm3AMAM ) {
sample = out0;
/*Bits*/int next = Op(1).GetSample( 0 );
sample += Op(2).GetSample( next );
sample += Op(3).GetSample( 0 );
}
switch( mode ) {
case sm2AM:
case sm2FM:
output[ offset+i ] += sample;
break;
case sm3AM:
case sm3FM:
case sm3FMFM:
case sm3AMFM:
case sm3FMAM:
case sm3AMAM:
output[ offset+i * 2 + 0 ] += sample & maskLeft;
output[ offset+i * 2 + 1 ] += sample & maskRight;
break;
}
}
switch( mode ) {
case sm2AM:
case sm2FM:
case sm3AM:
case sm3FM:
return chip.chan[index+1];
case sm3FMFM:
case sm3AMFM:
case sm3FMAM:
case sm3AMAM:
return chip.chan[index+2];
case sm2Percussion:
case sm3Percussion:
return chip.chan[index+3];
}
return null;
}
}
static private class Chip {
Chip() {
reg08 = 0;
reg04 = 0;
regBD = 0;
reg104 = 0;
opl3Active = 0;
for (int i=0;i<chan.length;i++) {
chan[i] = new Channel(this, i);
}
}
//This is used as the base counter for vibrato and tremolo
/*Bit32u*/int lfoCounter;
/*Bit32u*/int lfoAdd;
/*Bit32u*/long noiseCounter;
/*Bit32u*/long noiseAdd;
/*Bit32u*/int noiseValue;
//Frequency scales for the different multiplications
/*Bit32u*/int[] freqMul = new int[16];
//Rates for decay and release for rate of this chip
/*Bit32u*/int[] linearRates = new int[76];
//Best match attack rates for the rate of this chip
/*Bit32u*/int[] attackRates = new int[76];
//18 channels with 2 operators each
Channel[] chan = new Channel[19]; // last one is null
/*Bit8u*/short reg104;
/*Bit8u*/short reg08;
/*Bit8u*/short reg04;
/*Bit8u*/short regBD;
/*Bit8u*/short vibratoIndex;
/*Bit8u*/short tremoloIndex;
/*Bit8s*/byte vibratoSign;
/*Bit8u*/short vibratoShift;
/*Bit8u*/short tremoloValue;
/*Bit8u*/short vibratoStrength;
/*Bit8u*/short tremoloStrength;
//Mask for allowed wave forms
/*Bit8u*/short waveFormMask;
//0 or -1 when enabled
/*Bit8s*/byte opl3Active;
//Return the maximum amount of samples before and LFO change
/*Bit32u*/int ForwardLFO( /*Bit32u*/int samples ) {
//Current vibrato value, runs 4x slower than tremolo
vibratoSign = (byte)(( VibratoTable[ vibratoIndex >> 2] ) >> 7);
vibratoShift = (short)(( VibratoTable[ vibratoIndex >> 2] & 7) + vibratoStrength);
tremoloValue = (short)(TremoloTable[ tremoloIndex ] >> tremoloStrength);
//Check hom many samples there can be done before the value changes
/*Bit32u*/int todo = LFO_MAX - lfoCounter;
/*Bit32u*/int count = (todo + lfoAdd - 1) / lfoAdd;
if ( count > samples ) {
count = samples;
lfoCounter += count * lfoAdd;
} else {
lfoCounter += count * lfoAdd;
lfoCounter &= (LFO_MAX - 1);
//Maximum of 7 vibrato value * 4
vibratoIndex = (short)(( vibratoIndex + 1 ) & 31);
//Clip tremolo to the the table size
if ( tremoloIndex + 1 < TREMOLO_TABLE )
++tremoloIndex;
else
tremoloIndex = 0;
}
return count;
}
/*Bit32u*/int ForwardNoise() {
noiseCounter += noiseAdd;
/*Bitu*/long count = noiseCounter >> LFO_SH;
noiseCounter &= WAVE_MASK;
for ( ; count > 0; --count ) {
//Noise calculation from mame
noiseValue ^= ( 0x800302 ) & ( 0 - (noiseValue & 1 ) );
noiseValue >>= 1;
}
return noiseValue;
}
void WriteBD(/*Bit8u*/short val) {
/*Bit8u*/int change = regBD ^ val;
if (change==0)
return;
regBD = val;
//TODO could do this with shift and xor?
vibratoStrength = (val & 0x40)!=0 ? (short)0x00 : (short)0x01;
tremoloStrength = (val & 0x80)!=0 ? (short)0x00 : (short)0x02;
if ((val & 0x20)!=0) {
//Drum was just enabled, make sure channel 6 has the right synth
if ((change & 0x20)!=0) {
if ( opl3Active!=0 ) {
chan[6].synthHandlerMode = sm3Percussion;
} else {
chan[6].synthHandlerMode = sm2Percussion;
}
}
//Bass Drum
if ((val & 0x10)!=0) {
chan[6].op[0].KeyOn( 0x2 );
chan[6].op[1].KeyOn( 0x2 );
} else {
chan[6].op[0].KeyOff( 0x2 );
chan[6].op[1].KeyOff( 0x2 );
}
//Hi-Hat
if ((val & 0x1)!=0) {
chan[7].op[0].KeyOn( 0x2 );
} else {
chan[7].op[0].KeyOff( 0x2 );
}
//Snare
if ((val & 0x8)!=0) {
chan[7].op[1].KeyOn( 0x2 );
} else {
chan[7].op[1].KeyOff( 0x2 );
}
//Tom-Tom
if ((val & 0x4)!=0) {
chan[8].op[0].KeyOn( 0x2 );
} else {
chan[8].op[0].KeyOff( 0x2 );
}
//Top Cymbal
if ((val & 0x2)!=0) {
chan[8].op[1].KeyOn( 0x2 );
} else {
chan[8].op[1].KeyOff( 0x2 );
}
//Toggle keyoffs when we turn off the percussion
} else if ((change & 0x20)!=0) {
//Trigger a reset to setup the original synth handler
chan[6].ResetC0( this );
chan[6].op[0].KeyOff( 0x2 );
chan[6].op[1].KeyOff( 0x2 );
chan[7].op[0].KeyOff( 0x2 );
chan[7].op[1].KeyOff( 0x2 );
chan[8].op[0].KeyOff( 0x2 );
chan[8].op[1].KeyOff( 0x2 );
}
}
// static private int REGOP( _FUNC_ ) {
// index = ( ( reg >> 3) & 0x20 ) | ( reg & 0x1f );
// if ( OpOffsetTable[ index ] ) {
// Operator* regOp = (Operator*)( ((char *)this ) + OpOffsetTable[ index ] );
// regOp._FUNC_( this, val );
// }
// }
// static private final int REGCHAN( _FUNC_ )
// index = ( ( reg >> 4) & 0x10 ) | ( reg & 0xf );
// if ( ChanOffsetTable[ index ] ) {
// Channel* regChan = (Channel*)( ((char *)this ) + ChanOffsetTable[ index ] );
// regChan._FUNC_( this, val );
// }
void WriteReg(/*Bit32u*/int reg, /*Bit8u*/int val ) {
/*Bitu*/int index;
switch ( (reg & 0xf0) >> 4 ) {
case 0x00 >> 4:
if ( reg == 0x01 ) {
waveFormMask = ( val & 0x20 )!=0 ? (short)0x7 : (short)0x0;
} else if ( reg == 0x104 ) {
//Only detect changes in lowest 6 bits
if (((reg104 ^ val) & 0x3f)==0)
return;
//Always keep the highest bit enabled, for checking > 0x80
reg104 = (short)(0x80 | ( val & 0x3f ));
} else if ( reg == 0x105 ) {
//MAME says the real opl3 doesn't reset anything on opl3 disable/enable till the next write in another register
if (((opl3Active ^ val) & 1 )==0)
return;
opl3Active = ( val & 1 )!=0 ? (byte)0xff : (byte)0;
//Update the 0xc0 register for all channels to signal the switch to mono/stereo handlers
for ( int i = 0; i < 18;i++ ) {
chan[i].ResetC0( this );
}
} else if ( reg == 0x08 ) {
reg08 = (short)val;
}
case 0x10 >> 4:
break;
case 0x20 >> 4:
case 0x30 >> 4:
// REGOP( Write20 );
index = ( ( reg >> 3) & 0x20 ) | ( reg & 0x1f );
if (OpOffsetTable[index]>0) {
int offset = OpOffsetTable[ index ];
Operator regOp = chan[offset & 0xFFFF].op[offset >>> 16];
regOp.Write20( this, (short)val );
}
break;
case 0x40 >> 4:
case 0x50 >> 4:
// REGOP( Write40 );
index = ( ( reg >> 3) & 0x20 ) | ( reg & 0x1f );
if (OpOffsetTable[index]>0) {
int offset = OpOffsetTable[ index ];
Operator regOp = chan[offset & 0xFFFF].op[offset >>> 16];
regOp.Write40( this, (short)val );
}
break;
case 0x60 >> 4:
case 0x70 >> 4:
// REGOP( Write60 );
index = ( ( reg >> 3) & 0x20 ) | ( reg & 0x1f );
if (OpOffsetTable[index]>0) {
int offset = OpOffsetTable[ index ];
Operator regOp = chan[offset & 0xFFFF].op[offset >>> 16];
regOp.Write60( this, (short)val );
}
break;
case 0x80 >> 4:
case 0x90 >> 4:
// REGOP( Write80 );
index = ( ( reg >> 3) & 0x20 ) | ( reg & 0x1f );
if (OpOffsetTable[index]>0) {
int offset = OpOffsetTable[ index ];
Operator regOp = chan[offset & 0xFFFF].op[offset >>> 16];
regOp.Write80( this, (short)val );
}
break;
case 0xa0 >> 4:
// REGCHAN( WriteA0 );
index = ( ( reg >> 4) & 0x10 ) | ( reg & 0xf );
if (ChanOffsetTable[index]>=0) {
Channel regChan = this.chan[ChanOffsetTable[ index ]];
regChan.WriteA0( this, val );
}
break;
case 0xb0 >> 4:
if ( reg == 0xbd ) {
WriteBD( (short)val );
} else {
// REGCHAN( WriteB0 );
index = ( ( reg >> 4) & 0x10 ) | ( reg & 0xf );
if (ChanOffsetTable[index]>=0) {
Channel regChan = this.chan[ChanOffsetTable[ index ]];
regChan.WriteB0( this, (short)val );
}
}
break;
case 0xc0 >> 4:
// REGCHAN( WriteC0 );
index = ( ( reg >> 4) & 0x10 ) | ( reg & 0xf );
if (ChanOffsetTable[index]>=0) {
Channel regChan = this.chan[ChanOffsetTable[ index ]];
regChan.WriteC0( this, (short)val );
}
case 0xd0 >> 4:
break;
case 0xe0 >> 4:
case 0xf0 >> 4:
// REGOP( WriteE0 );
index = ( ( reg >> 3) & 0x20 ) | ( reg & 0x1f );
if (OpOffsetTable[index]>0) {
int offset = OpOffsetTable[ index ];
Operator regOp = chan[offset & 0xFFFF].op[offset >>> 16];
regOp.WriteE0( this, (short)val );
}
break;
}
}
/*Bit32u*/long WriteAddr( /*Bit32u*/int port, /*Bit8u*/short val ) {
switch ( port & 3 ) {
case 0:
return val;
case 2:
if ( opl3Active!=0 || (val == 0x05) )
return 0x100 | val;
else
return val;
}
return 0;
}
void GenerateBlock2( /*Bitu*/int total, /*Bit32s*/int[] output, int offset) {
while ( total > 0 ) {
/*Bit32u*/int samples = ForwardLFO( total );
java.util.Arrays.fill(output, offset, samples+offset, 0);
int count = 0;
for(int i=0; i < 9;) {
Channel ch = chan[i];
count++;
i = ch.BlockTemplate(ch.synthHandlerMode, this, samples, output, offset).index;
}
total -= samples;
offset += samples;
}
}
void GenerateBlock3( /*Bitu*/int total, /*Bit32s*/int[] output, int offset) {
while ( total > 0 ) {
/*Bit32u*/int samples = ForwardLFO( total );
java.util.Arrays.fill(output, offset, offset+samples*2, 0);
int count = 0;
for(int i=0; i < 18;) {
Channel ch = chan[i];
count++;
i = ch.BlockTemplate(ch.synthHandlerMode, this, samples, output, offset).index;
}
total -= samples;
offset += samples * 2;
}
}
//void Generate( /*Bit32u*/long samples );
void Setup(/*Bit32u*/long rate) {
double d_original = OPLRATE;
// double original = rate;
double scale = d_original / (double)rate;
//Noise counter is run at the same precision as general waves
noiseAdd = (/*Bit32u*/long)( 0.5 + scale * ( 1 << LFO_SH ) );
noiseCounter = 0;
noiseValue = 1; //Make sure it triggers the noise xor the first time
//The low frequency oscillation counter
//Every time his overflows vibrato and tremoloindex are increased
lfoAdd = (/*Bit32u*/int)( 0.5 + scale * ( 1 << LFO_SH ) );
lfoCounter = 0;
vibratoIndex = 0;
tremoloIndex = 0;
//With higher octave this gets shifted up
//-1 since the freqCreateTable = *2
if (WAVE_PRECISION) {
double freqScale = ( 1 << 7 ) * scale * ( 1 << ( WAVE_SH - 1 - 10));
for ( int i = 0; i < 16; i++ ) {
freqMul[i] = (/*Bit32u*/int)( 0.5 + freqScale * FreqCreateTable[ i ] );
}
} else {
/*Bit32u*/int freqScale = (/*Bit32u*/int)( 0.5 + scale * ( 1 << ( WAVE_SH - 1 - 10)));
for ( int i = 0; i < 16; i++ ) {
freqMul[i] = freqScale * FreqCreateTable[ i ];
}
}
//-3 since the real envelope takes 8 steps to reach the single value we supply
for ( /*Bit8u*/int i = 0; i < 76; i++ ) {
/*Bit8u*/int index, shift;
//EnvelopeSelect( i, index, shift );
if ( i < 13 * 4 ) { //Rate 0 - 12
shift = 12 - ( i >> 2 );
index = i & 3;
} else if ( i < 15 * 4 ) { //rate 13 - 14
shift = 0;
index = i - 12 * 4;
} else { //rate 15 and up
shift = 0;
index = 12;
}
linearRates[i] = (/*Bit32u*/int)( scale * (EnvelopeIncreaseTable[ index ] << ( RATE_SH + ENV_EXTRA - shift - 3 )));
}
//Generate the best matching attack rate
for ( /*Bit8u*/int i = 0; i < 62; i++ ) {
/*Bit8u*/int index, shift;
//EnvelopeSelect( i, index, shift );
if ( i < 13 * 4 ) { //Rate 0 - 12
shift = 12 - ( i >> 2 );
index = i & 3;
} else if ( i < 15 * 4 ) { //rate 13 - 14
shift = 0;
index = i - 12 * 4;
} else { //rate 15 and up
shift = 0;
index = 12;
}
//Original amount of samples the attack would take
/*Bit32s*/int i_original = (/*Bit32u*/int)( (AttackSamplesTable[ index ] << shift) / scale);
/*Bit32s*/int guessAdd = (/*Bit32u*/int)( scale * (EnvelopeIncreaseTable[ index ] << ( RATE_SH - shift - 3 )));
/*Bit32s*/int bestAdd = guessAdd;
/*Bit32u*/long bestDiff = 1 << 30;
for( /*Bit32u*/long passes = 0; passes < 16; passes ++ ) {
/*Bit32s*/int volume = ENV_MAX;
/*Bit32s*/int samples = 0;
/*Bit32u*/int count = 0;
while ( volume > 0 && samples < i_original * 2 ) {
count += guessAdd;
/*Bit32s*/int change = count >> RATE_SH;
count &= RATE_MASK;
if (change!=0) { // less than 1 %
volume += ( ~volume * change ) >> 3;
}
samples++;
}
/*Bit32s*/int diff = i_original - samples;
/*Bit32u*/long lDiff = Math.abs(diff);
//Init last on first pass
if ( lDiff < bestDiff ) {
bestDiff = lDiff;
bestAdd = guessAdd;
if (bestDiff==0)
break;
}
//Below our target
if ( diff < 0 ) {
//Better than the last time
/*Bit32s*/int mul = ((i_original - diff) << 12) / i_original;
guessAdd = ((guessAdd * mul) >> 12);
guessAdd++;
} else if ( diff > 0 ) {
/*Bit32s*/int mul = ((i_original - diff) << 12) / i_original;
guessAdd = (guessAdd * mul) >> 12;
guessAdd--;
}
}
attackRates[i] = bestAdd;
}
for ( /*Bit8u*/short i = 62; i < 76; i++ ) {
//This should provide instant volume maximizing
attackRates[i] = 8 << RATE_SH;
}
//Setup the channels with the correct four op flags
//Channels are accessed through a table so they appear linear here
chan[ 0].fourMask = 0x00 | ( 1 << 0 );
chan[ 1].fourMask = 0x80 | ( 1 << 0 );
chan[ 2].fourMask = 0x00 | ( 1 << 1 );
chan[ 3].fourMask = 0x80 | ( 1 << 1 );
chan[ 4].fourMask = 0x00 | ( 1 << 2 );
chan[ 5].fourMask = 0x80 | ( 1 << 2 );
chan[ 9].fourMask = 0x00 | ( 1 << 3 );
chan[10].fourMask = 0x80 | ( 1 << 3 );
chan[11].fourMask = 0x00 | ( 1 << 4 );
chan[12].fourMask = 0x80 | ( 1 << 4 );
chan[13].fourMask = 0x00 | ( 1 << 5 );
chan[14].fourMask = 0x80 | ( 1 << 5 );
//mark the percussion channels
chan[ 6].fourMask = 0x40;
chan[ 7].fourMask = 0x40;
chan[ 8].fourMask = 0x40;
//Clear Everything in opl3 mode
WriteReg( 0x105, 0x1 );
for ( int i = 0; i < 512; i++ ) {
if ( i == 0x105 )
continue;
WriteReg( i, 0xff );
WriteReg( i, 0x0 );
}
WriteReg( 0x105, 0x0 );
//Clear everything in opl2 mode
for ( int i = 0; i < 255; i++ ) {
WriteReg( i, 0xff );
WriteReg( i, 0x0 );
}
}
}
final public static class Handler implements Adlib.Handler {
Chip chip = new Chip();
public /*Bit32u*/long WriteAddr( /*Bit32u*/int port, /*Bit8u*/short val ) {
return chip.WriteAddr( port, val );
}
public void WriteReg( /*Bit32u*/int addr, /*Bit8u*/short val ) {
chip.WriteReg( addr, val );
}
/*Bit32s*/int[] buffer = new int[512*2];
public void Generate( Mixer.MixerChannel chan, /*Bitu*/int samples ) {
if (samples > 512)
samples = 512;
if (chip.opl3Active==0) {
chip.GenerateBlock2( samples, buffer, 0);
chan.AddSamples_m32( samples, buffer);
} else {
chip.GenerateBlock3( samples, buffer, 0);
chan.AddSamples_s32( samples, buffer);
}
}
public void Init( /*Bitu*/long rate ) {
InitTables();
chip.Setup( rate );
}
}
static private final double PI = 3.14159265358979323846;
// #if ( DBOPL_WAVE == WAVE_HANDLER )
/*
Generate the different waveforms out of the sine/exponetial table using handlers
*/
static private /*Bits*/int MakeVolume( /*Bitu*/int wave, /*Bitu*/int volume ) {
/*Bitu*/int total = wave + volume;
/*Bitu*/int index = total & 0xff;
/*Bitu*/int sig = ExpTable[ index ];
/*Bitu*/int exp = total >> 8;
// #if 0
// //Check if we overflow the 31 shift limit
// if ( exp >= 32 ) {
// LOG_MSG( "WTF %d %d", total, exp );
// }
// #endif
return (sig >> exp);
}
static private final WaveHandler WaveForm0 = new WaveHandler() {
public /*Bits*/int call(int i, int volume) {
/*Bits*/int neg = 0 - (( i >> 9) & 1);//Create ~0 or 0
/*Bitu*/int wave = SinTable[i & 511];
return (MakeVolume( wave, volume ) ^ neg) - neg;
}
};
static private final WaveHandler WaveForm1 = new WaveHandler() {
public /*Bits*/int call(int i, int volume) {
/*Bit32u*/int wave = SinTable[i & 511];
wave |= ( ( (i ^ 512 ) & 512) - 1) >> ( 32 - 12 );
return MakeVolume( wave, volume );
}
};
static private final WaveHandler WaveForm2 = new WaveHandler() {
public /*Bits*/int call(int i, int volume) {
/*Bitu*/int wave = SinTable[i & 511];
return MakeVolume( wave, volume );
}
};
static private final WaveHandler WaveForm3 = new WaveHandler() {
public /*Bits*/int call(int i, int volume) {
/*Bitu*/int wave = SinTable[i & 255];
wave |= ( ( (i ^ 256 ) & 256) - 1) >> ( 32 - 12 );
return MakeVolume( wave, volume );
}
};
static private final WaveHandler WaveForm4 = new WaveHandler() {
public /*Bits*/int call(int i, int volume) {
//Twice as fast
i <<= 1;
/*Bits*/int neg = 0 - (( i >> 9) & 1);//Create ~0 or 0
/*Bitu*/int wave = SinTable[i & 511];
wave |= ( ( (i ^ 512 ) & 512) - 1) >> ( 32 - 12 );
return (MakeVolume( wave, volume ) ^ neg) - neg;
}
};
static private final WaveHandler WaveForm5 = new WaveHandler() {
public /*Bits*/int call(int i, int volume) {
//Twice as fast
i <<= 1;
/*Bitu*/int wave = SinTable[i & 511];
wave |= ( ( (i ^ 512 ) & 512) - 1) >> ( 32 - 12 );
return MakeVolume( wave, volume );
}
};
static private final WaveHandler WaveForm6 = new WaveHandler() {
public /*Bits*/int call(int i, int volume) {
/*Bits*/int neg = 0 - (( i >> 9) & 1);//Create ~0 or 0
return (MakeVolume( 0, volume ) ^ neg) - neg;
}
};
static private final WaveHandler WaveForm7 = new WaveHandler() {
public /*Bits*/int call(int i, int volume) {
//Negative is reversed here
/*Bits*/int neg = (( i >> 9) & 1) - 1;
/*Bitu*/int wave = (i << 3);
//When negative the volume also runs backwards
wave = ((wave ^ neg) - neg) & 4095;
return (MakeVolume( wave, volume ) ^ neg) - neg;
}
};
static final private WaveHandler[] WaveHandlerTable = {
WaveForm0, WaveForm1, WaveForm2, WaveForm3,
WaveForm4, WaveForm5, WaveForm6, WaveForm7
};
// #endif
private static boolean doneTables = false;
static private void InitTables() {
if ( doneTables )
return;
doneTables = true;
if ( DBOPL_WAVE == WAVE_HANDLER || DBOPL_WAVE == WAVE_TABLELOG ) {
//Exponential volume table, same as the real adlib
for ( int i = 0; i < 256; i++ ) {
//Save them in reverse
ExpTable[i] = (int)( 0.5 + ( Math.pow(2.0, ( 255 - i) * ( 1.0 /256 ) )-1) * 1024 );
ExpTable[i] += 1024; //or remove the -1 oh well :)
//Preshift to the left once so the final volume can shift to the right
ExpTable[i] *= 2;
}
}
if ( DBOPL_WAVE == WAVE_HANDLER ) {
//Add 0.5 for the trunc rounding of the integer cast
//Do a PI sinetable instead of the original 0.5 PI
for ( int i = 0; i < 512; i++ ) {
SinTable[i] = (/*Bit16s*/short)( 0.5 - log10( Math.sin( (i + 0.5) * (PI / 512.0) ) ) / log10(2.0)*256 );
}
}
if ( DBOPL_WAVE == WAVE_TABLEMUL ) {
//Multiplication based tables
for ( int i = 0; i < 384; i++ ) {
int s = i * 8;
//TODO maybe keep some of the precision errors of the original table?
double val = ( 0.5 + ( Math.pow(2.0, -1.0 + ( 255 - s) * ( 1.0 /256 ) )) * ( 1 << MUL_SH ));
MulTable[i] = (/*Bit16u*/int)(val);
}
//Sine Wave Base
for ( int i = 0; i < 512; i++ ) {
WaveTable[ 0x0200 + i ] = (/*Bit16s*/short)(Math.sin( (i + 0.5) * (PI / 512.0) ) * 4084);
WaveTable[ 0x0000 + i ] = (short)-WaveTable[ 0x200 + i ];
}
//Exponential wave
for ( int i = 0; i < 256; i++ ) {
WaveTable[ 0x700 + i ] = (/*Bit16s*/short)( 0.5 + ( Math.pow(2.0, -1.0 + ( 255 - i * 8) * ( 1.0 /256 ) ) ) * 4085 );
WaveTable[ 0x6ff - i ] = (short)-WaveTable[ 0x700 + i ];
}
}
if ( DBOPL_WAVE == WAVE_TABLELOG ) {
//Sine Wave Base
for ( int i = 0; i < 512; i++ ) {
WaveTable[ 0x0200 + i ] = (/*Bit16s*/short)( 0.5 - log10( Math.sin( (i + 0.5) * (PI / 512.0) ) ) / log10(2.0)*256 );
WaveTable[ 0x0000 + i ] = (short)(((/*Bit16s*/short)0x8000) | WaveTable[ 0x200 + i]);
}
//Exponential wave
for ( int i = 0; i < 256; i++ ) {
WaveTable[ 0x700 + i ] = (short)(i * 8);
WaveTable[ 0x6ff - i ] = (short)(((/*Bit16s*/short)0x8000) | i * 8);
}
}
// | |//\\|____|WAV7|//__|/\ |____|/\/\|
// |\\//| | |WAV7| | \/| | |
// |06 |0126|27 |7 |3 |4 |4 5 |5 |
if (( DBOPL_WAVE == WAVE_TABLELOG ) || ( DBOPL_WAVE == WAVE_TABLEMUL )) {
for ( int i = 0; i < 256; i++ ) {
//Fill silence gaps
WaveTable[ 0x400 + i ] = WaveTable[0];
WaveTable[ 0x500 + i ] = WaveTable[0];
WaveTable[ 0x900 + i ] = WaveTable[0];
WaveTable[ 0xc00 + i ] = WaveTable[0];
WaveTable[ 0xd00 + i ] = WaveTable[0];
//Replicate sines in other pieces
WaveTable[ 0x800 + i ] = WaveTable[ 0x200 + i ];
//double speed sines
WaveTable[ 0xa00 + i ] = WaveTable[ 0x200 + i * 2 ];
WaveTable[ 0xb00 + i ] = WaveTable[ 0x000 + i * 2 ];
WaveTable[ 0xe00 + i ] = WaveTable[ 0x200 + i * 2 ];
WaveTable[ 0xf00 + i ] = WaveTable[ 0x200 + i * 2 ];
}
}
//Create the ksl table
for ( int oct = 0; oct < 8; oct++ ) {
int base = oct * 8;
for ( int i = 0; i < 16; i++ ) {
int val = base - KslCreateTable[i];
if ( val < 0 )
val = 0;
//*4 for the final range to match attenuation range
KslTable[ oct * 16 + i ] = (short)(val * 4);
}
}
//Create the Tremolo table, just increase and decrease a triangle wave
for ( /*Bit8u*/short i = 0; i < TREMOLO_TABLE / 2; i++ ) {
/*Bit8u*/short val = (short)(i << ENV_EXTRA);
TremoloTable[i] = val;
TremoloTable[TREMOLO_TABLE - 1 - i] = val;
}
//Create a table with offsets of the channels from the start of the chip
Chip chip = null;
for ( /*Bitu*/int i = 0; i < 32; i++ ) {
/*Bitu*/int index = i & 0xf;
if ( index >= 9 ) {
ChanOffsetTable[i] = -1;
continue;
}
//Make sure the four op channels follow eachother
if ( index < 6 ) {
index = (index % 3) * 2 + ( index / 3 );
}
//Add back the bits for highest ones
if ( i >= 16 )
index += 9;
// /*Bitu*/int blah = reinterpret_cast</*Bitu*/long>( &(chip.chan[ index ]) );
ChanOffsetTable[i] = index;
}
//Same for operators
for ( /*Bitu*/int i = 0; i < 64; i++ ) {
if ( i % 8 >= 6 || ( (i / 8) % 4 == 3 ) ) {
OpOffsetTable[i] = -1;
continue;
}
/*Bitu*/int chNum = (i / 8) * 3 + (i % 8) % 3;
//Make sure we use 16 and up for the 2nd range to match the chanoffset gap
if ( chNum >= 12 )
chNum += 16 - 12;
/*Bitu*/int opNum = ( i % 8 ) / 3;
Channel chan = null;
// /*Bitu*/int blah = reinterpret_cast</*Bitu*/long>( &(chan.op[opNum]) );
OpOffsetTable[i] = ChanOffsetTable[ chNum ] | opNum<<16;
}
// #if 0
// //Stupid checks if table's are correct
// for ( /*Bitu*/long i = 0; i < 18; i++ ) {
// /*Bit32u*/long find = (/*Bit16u*/int)( &(chip.chan[ i ]) );
// for ( /*Bitu*/long c = 0; c < 32; c++ ) {
// if ( ChanOffsetTable[c] == find ) {
// find = 0;
// break;
// }
// }
// if ( find ) {
// find = find;
// }
// }
// for ( /*Bitu*/long i = 0; i < 36; i++ ) {
// /*Bit32u*/long find = (/*Bit16u*/int)( &(chip.chan[ i / 2 ].op[i % 2]) );
// for ( /*Bitu*/long c = 0; c < 64; c++ ) {
// if ( OpOffsetTable[c] == find ) {
// find = 0;
// break;
// }
// }
// if ( find ) {
// find = find;
// }
// }
// #endif
}
}