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dbopl.c
1645 lines (1508 loc) · 47.7 KB
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dbopl.c
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/*
* Copyright (C) 2002-2010 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
//
// Chocolate Doom-related discussion:
//
// This is the DosBox OPL emulator code (src/hardware/dbopl.cpp) r3635,
// converted to C. The bulk of the work was done using the minus-minus
// script in the Chocolate Doom SVN repository, then the result tweaked
// by hand until working.
//
/*
DOSBox implementation of a combined Yamaha YMF262 and Yamaha YM3812 emulator.
Enabling the opl3 bit will switch the emulator to stereo opl3 output instead of regular mono opl2
Except for the table generation it's all integer math
Can choose different types of generators, using muls and bigger tables, try different ones for slower platforms
The generation was based on the MAME implementation but tried to have it use less memory and be faster in general
MAME uses much bigger envelope tables and this will be the biggest cause of it sounding different at times
//TODO Don't delay first operator 1 sample in opl3 mode
//TODO Maybe not use class method pointers but a regular function pointers with operator as first parameter
//TODO Fix panning for the Percussion channels, would any opl3 player use it and actually really change it though?
//TODO Check if having the same accuracy in all frequency multipliers sounds better or not
//DUNNO Keyon in 4op, switch to 2op without keyoff.
*/
/* $Id: dbopl.cpp,v 1.10 2009-06-10 19:54:51 harekiet Exp $ */
#include <math.h>
#include <stdlib.h>
#include <string.h>
//#include "dosbox.h"
#include "dbopl.h"
#define GCC_UNLIKELY(x) x
#define TRUE 1
#define FALSE 0
#ifndef PI
#define PI 3.14159265358979323846
#endif
#define OPLRATE ((double)(14318180.0 / 288.0))
#define TREMOLO_TABLE 52
//Try to use most precision for frequencies
//Else try to keep different waves in synch
//#define WAVE_PRECISION 1
#ifndef WAVE_PRECISION
//Wave bits available in the top of the 32bit range
//Original adlib uses 10.10, we use 10.22
#define 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
//#define WAVE_BITS 14
#endif
#define WAVE_SH ( 32 - WAVE_BITS )
#define WAVE_MASK ( ( 1 << WAVE_SH ) - 1 )
//Use the same accuracy as the waves
#define LFO_SH ( WAVE_SH - 10 )
//LFO is controlled by our tremolo 256 sample limit
#define 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
#define ENV_BITS ( 9 )
#else
//Add 3 bits here for more accuracy and would have to be shifted up either way
#define ENV_BITS ( 9 )
#endif
//Limits of the envelope with those bits and when the envelope goes silent
#define ENV_MIN 0
#define ENV_EXTRA ( ENV_BITS - 9 )
#define ENV_MAX ( 511 << ENV_EXTRA )
#define ENV_LIMIT ( ( 12 * 256) >> ( 3 - ENV_EXTRA ) )
#define ENV_SILENT( _X_ ) ( (_X_) >= ENV_LIMIT )
//Attack/decay/release rate counter shift
#define RATE_SH 24
#define RATE_MASK ( ( 1 << RATE_SH ) - 1 )
//Has to fit within 16bit lookuptable
#define MUL_SH 16
//Check some ranges
#if ENV_EXTRA > 3
#error Too many envelope bits
#endif
static inline void Operator__SetState(Operator *self, Bit8u s );
static inline Bit32u Chip__ForwardNoise(Chip *self);
// C++'s template<> sure is useful sometimes.
static Channel* Channel__BlockTemplate(Channel *self, Chip* chip,
Bit32u samples, Bit32s* output,
SynthMode mode );
#define BLOCK_TEMPLATE(mode) \
static Channel* Channel__BlockTemplate_ ## mode(Channel *self, Chip* chip, \
Bit32u samples, Bit32s* output) \
{ \
return Channel__BlockTemplate(self, chip, samples, output, mode); \
}
BLOCK_TEMPLATE(sm2AM)
BLOCK_TEMPLATE(sm2FM)
BLOCK_TEMPLATE(sm3AM)
BLOCK_TEMPLATE(sm3FM)
BLOCK_TEMPLATE(sm3FMFM)
BLOCK_TEMPLATE(sm3AMFM)
BLOCK_TEMPLATE(sm3FMAM)
BLOCK_TEMPLATE(sm3AMAM)
BLOCK_TEMPLATE(sm2Percussion)
BLOCK_TEMPLATE(sm3Percussion)
//How much to substract from the base value for the final attenuation
static const Bit8u KslCreateTable[16] = {
//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,
};
#define M(_X_) ((Bit8u)( (_X_) * 2))
static const Bit8u FreqCreateTable[16] = {
M(0.5), M(1 ), M(2 ), M(3 ), M(4 ), M(5 ), M(6 ), M(7 ),
M(8 ), M(9 ), M(10), M(10), M(12), M(12), M(15), M(15)
};
#undef M
//We're not including the highest attack rate, that gets a special value
static const Bit8u AttackSamplesTable[13] = {
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 const Bit8u EnvelopeIncreaseTable[13] = {
4, 5, 6, 7,
8, 10, 12, 14,
16, 20, 24, 28,
32,
};
#if ( DBOPL_WAVE == WAVE_HANDLER ) || ( DBOPL_WAVE == WAVE_TABLELOG )
static Bit16u ExpTable[ 256 ];
#endif
#if ( DBOPL_WAVE == WAVE_HANDLER )
//PI table used by WAVEHANDLER
static Bit16u SinTable[ 512 ];
#endif
#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 Bit16s WaveTable[ 8 * 512 ];
//Distance into WaveTable the wave starts
static const Bit16u WaveBaseTable[8] = {
0x000, 0x200, 0x200, 0x800,
0xa00, 0xc00, 0x100, 0x400,
};
//Mask the counter with this
static const Bit16u WaveMaskTable[8] = {
1023, 1023, 511, 511,
1023, 1023, 512, 1023,
};
//Where to start the counter on at keyon
static const Bit16u WaveStartTable[8] = {
512, 0, 0, 0,
0, 512, 512, 256,
};
#endif
#if ( DBOPL_WAVE == WAVE_TABLEMUL )
static Bit16u MulTable[ 384 ];
#endif
static Bit8u KslTable[ 8 * 16 ];
static Bit8u TremoloTable[ TREMOLO_TABLE ];
//Start of a channel behind the chip struct start
static Bit16u ChanOffsetTable[32];
//Start of an operator behind the chip struct start
static Bit16u OpOffsetTable[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 const Bit8s VibratoTable[ 8 ] = {
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 const Bit8u KslShiftTable[4] = {
31,1,2,0
};
//Generate a table index and table shift value using input value from a selected rate
static void EnvelopeSelect( Bit8u val, Bit8u *index, Bit8u *shift ) {
if ( val < 13 * 4 ) { //Rate 0 - 12
*shift = 12 - ( val >> 2 );
*index = val & 3;
} else if ( val < 15 * 4 ) { //rate 13 - 14
*shift = 0;
*index = val - 12 * 4;
} else { //rate 15 and up
*shift = 0;
*index = 12;
}
}
#if ( DBOPL_WAVE == WAVE_HANDLER )
/*
Generate the different waveforms out of the sine/exponetial table using handlers
*/
static inline Bits MakeVolume( Bitu wave, Bitu volume ) {
Bitu total = wave + volume;
Bitu index = total & 0xff;
Bitu sig = ExpTable[ index ];
Bitu 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 Bits DB_FASTCALL WaveForm0( Bitu i, Bitu volume ) {
Bits neg = 0 - (( i >> 9) & 1);//Create ~0 or 0
Bitu wave = SinTable[i & 511];
return (MakeVolume( wave, volume ) ^ neg) - neg;
}
static Bits DB_FASTCALL WaveForm1( Bitu i, Bitu volume ) {
Bit32u wave = SinTable[i & 511];
wave |= ( ( (i ^ 512 ) & 512) - 1) >> ( 32 - 12 );
return MakeVolume( wave, volume );
}
static Bits DB_FASTCALL WaveForm2( Bitu i, Bitu volume ) {
Bitu wave = SinTable[i & 511];
return MakeVolume( wave, volume );
}
static Bits DB_FASTCALL WaveForm3( Bitu i, Bitu volume ) {
Bitu wave = SinTable[i & 255];
wave |= ( ( (i ^ 256 ) & 256) - 1) >> ( 32 - 12 );
return MakeVolume( wave, volume );
}
static Bits DB_FASTCALL WaveForm4( Bitu i, Bitu volume ) {
//Twice as fast
i <<= 1;
Bits neg = 0 - (( i >> 9) & 1);//Create ~0 or 0
Bitu wave = SinTable[i & 511];
wave |= ( ( (i ^ 512 ) & 512) - 1) >> ( 32 - 12 );
return (MakeVolume( wave, volume ) ^ neg) - neg;
}
static Bits DB_FASTCALL WaveForm5( Bitu i, Bitu volume ) {
//Twice as fast
i <<= 1;
Bitu wave = SinTable[i & 511];
wave |= ( ( (i ^ 512 ) & 512) - 1) >> ( 32 - 12 );
return MakeVolume( wave, volume );
}
static Bits DB_FASTCALL WaveForm6( Bitu i, Bitu volume ) {
Bits neg = 0 - (( i >> 9) & 1);//Create ~0 or 0
return (MakeVolume( 0, volume ) ^ neg) - neg;
}
static Bits DB_FASTCALL WaveForm7( Bitu i, Bitu volume ) {
//Negative is reversed here
Bits neg = (( i >> 9) & 1) - 1;
Bitu wave = (i << 3);
//When negative the volume also runs backwards
wave = ((wave ^ neg) - neg) & 4095;
return (MakeVolume( wave, volume ) ^ neg) - neg;
}
static const WaveHandler WaveHandlerTable[8] = {
WaveForm0, WaveForm1, WaveForm2, WaveForm3,
WaveForm4, WaveForm5, WaveForm6, WaveForm7
};
#endif
/*
Operator
*/
//We zero out when rate == 0
static inline void Operator__UpdateAttack(Operator *self, const Chip* chip ) {
Bit8u rate = self->reg60 >> 4;
if ( rate ) {
Bit8u val = (rate << 2) + self->ksr;
self->attackAdd = chip->attackRates[ val ];
self->rateZero &= ~(1 << ATTACK);
} else {
self->attackAdd = 0;
self->rateZero |= (1 << ATTACK);
}
}
static inline void Operator__UpdateDecay(Operator *self, const Chip* chip ) {
Bit8u rate = self->reg60 & 0xf;
if ( rate ) {
Bit8u val = (rate << 2) + self->ksr;
self->decayAdd = chip->linearRates[ val ];
self->rateZero &= ~(1 << DECAY);
} else {
self->decayAdd = 0;
self->rateZero |= (1 << DECAY);
}
}
static inline void Operator__UpdateRelease(Operator *self, const Chip* chip ) {
Bit8u rate = self->reg80 & 0xf;
if ( rate ) {
Bit8u val = (rate << 2) + self->ksr;
self->releaseAdd = chip->linearRates[ val ];
self->rateZero &= ~(1 << RELEASE);
if ( !(self->reg20 & MASK_SUSTAIN ) ) {
self->rateZero &= ~( 1 << SUSTAIN );
}
} else {
self->rateZero |= (1 << RELEASE);
self->releaseAdd = 0;
if ( !(self->reg20 & MASK_SUSTAIN ) ) {
self->rateZero |= ( 1 << SUSTAIN );
}
}
}
static inline void Operator__UpdateAttenuation(Operator *self) {
Bit8u kslBase = (Bit8u)((self->chanData >> SHIFT_KSLBASE) & 0xff);
Bit32u tl = self->reg40 & 0x3f;
Bit8u kslShift = KslShiftTable[ self->reg40 >> 6 ];
//Make sure the attenuation goes to the right bits
self->totalLevel = tl << ( ENV_BITS - 7 ); //Total level goes 2 bits below max
self->totalLevel += ( kslBase << ENV_EXTRA ) >> kslShift;
}
static void Operator__UpdateFrequency(Operator *self) {
Bit32u freq = self->chanData & (( 1 << 10 ) - 1);
Bit32u block = (self->chanData >> 10) & 0xff;
/*
#ifdef WAVE_PRECISION
block = 7 - block;
self->waveAdd = ( freq * self->freqMul ) >> block;
#else
*/
self->waveAdd = ( freq << block ) * self->freqMul;
//#endif
if ( self->reg20 & MASK_VIBRATO ) {
self->vibStrength = (Bit8u)(freq >> 7);
/*
#ifdef WAVE_PRECISION
self->vibrato = ( self->vibStrength * self->freqMul ) >> block;
#else
*/
self->vibrato = ( self->vibStrength << block ) * self->freqMul;
//#endif
} else {
self->vibStrength = 0;
self->vibrato = 0;
}
}
static void Operator__UpdateRates(Operator *self, const Chip* chip ) {
//Mame seems to reverse this where enabling ksr actually lowers
//the rate, but pdf manuals says otherwise?
Bit8u newKsr = (Bit8u)((self->chanData >> SHIFT_KEYCODE) & 0xff);
if ( !( self->reg20 & MASK_KSR ) ) {
newKsr >>= 2;
}
if ( self->ksr == newKsr )
return;
self->ksr = newKsr;
Operator__UpdateAttack( self, chip );
Operator__UpdateDecay( self, chip );
Operator__UpdateRelease( self, chip );
}
static inline Bit32s Operator__RateForward(Operator *self, Bit32u add ) {
Bit32s ret; // haleyjd: GNUisms out!
self->rateIndex += add;
ret = self->rateIndex >> RATE_SH;
self->rateIndex = self->rateIndex & RATE_MASK;
return ret;
}
static Bits Operator__TemplateVolume(Operator *self, OperatorState yes) {
Bit32s vol = self->volume;
Bit32s change;
switch ( yes ) {
case OFF:
return ENV_MAX;
case ATTACK:
change = Operator__RateForward( self, self->attackAdd );
if ( !change )
return vol;
vol += ( (~vol) * change ) >> 3;
if ( vol < ENV_MIN ) {
self->volume = ENV_MIN;
self->rateIndex = 0;
Operator__SetState( self, DECAY );
return ENV_MIN;
}
break;
case DECAY:
vol += Operator__RateForward( self, self->decayAdd );
if ( GCC_UNLIKELY(vol >= self->sustainLevel) ) {
//Check if we didn't overshoot max attenuation, then just go off
if ( GCC_UNLIKELY(vol >= ENV_MAX) ) {
self->volume = ENV_MAX;
Operator__SetState( self, OFF );
return ENV_MAX;
}
//Continue as sustain
self->rateIndex = 0;
Operator__SetState( self, SUSTAIN );
}
break;
case SUSTAIN:
if ( self->reg20 & MASK_SUSTAIN ) {
return vol;
}
//In sustain phase, but not sustaining, do regular release
case RELEASE:
vol += Operator__RateForward( self, self->releaseAdd );;
if ( GCC_UNLIKELY(vol >= ENV_MAX) ) {
self->volume = ENV_MAX;
Operator__SetState( self, OFF );
return ENV_MAX;
}
break;
}
self->volume = vol;
return vol;
}
#define TEMPLATE_VOLUME(mode) \
static Bits Operator__TemplateVolume ## mode(Operator *self) \
{ \
return Operator__TemplateVolume(self, mode); \
}
TEMPLATE_VOLUME(OFF)
TEMPLATE_VOLUME(RELEASE)
TEMPLATE_VOLUME(SUSTAIN)
TEMPLATE_VOLUME(ATTACK)
TEMPLATE_VOLUME(DECAY)
static const VolumeHandler VolumeHandlerTable[5] = {
&Operator__TemplateVolumeOFF,
&Operator__TemplateVolumeRELEASE,
&Operator__TemplateVolumeSUSTAIN,
&Operator__TemplateVolumeDECAY,
&Operator__TemplateVolumeATTACK,
};
static inline Bitu Operator__ForwardVolume(Operator *self) {
return self->currentLevel + (self->volHandler)(self);
}
static inline Bitu Operator__ForwardWave(Operator *self) {
self->waveIndex += self->waveCurrent;
return self->waveIndex >> WAVE_SH;
}
static void Operator__Write20(Operator *self, const Chip* chip, Bit8u val ) {
Bit8u change = (self->reg20 ^ val );
if ( !change )
return;
self->reg20 = val;
//Shift the tremolo bit over the entire register, saved a branch, YES!
self->tremoloMask = (Bit8s)(val) >> 7;
self->tremoloMask &= ~(( 1 << ENV_EXTRA ) -1);
//Update specific features based on changes
if ( change & MASK_KSR ) {
Operator__UpdateRates( self, chip );
}
//With sustain enable the volume doesn't change
if ( self->reg20 & MASK_SUSTAIN || ( !self->releaseAdd ) ) {
self->rateZero |= ( 1 << SUSTAIN );
} else {
self->rateZero &= ~( 1 << SUSTAIN );
}
//Frequency multiplier or vibrato changed
if ( change & (0xf | MASK_VIBRATO) ) {
self->freqMul = chip->freqMul[ val & 0xf ];
Operator__UpdateFrequency(self);
}
}
static void Operator__Write40(Operator *self, const Chip *chip, Bit8u val ) {
if (!(self->reg40 ^ val ))
return;
self->reg40 = val;
Operator__UpdateAttenuation( self );
}
static void Operator__Write60(Operator *self, const Chip* chip, Bit8u val ) {
Bit8u change = self->reg60 ^ val;
self->reg60 = val;
if ( change & 0x0f ) {
Operator__UpdateDecay( self, chip );
}
if ( change & 0xf0 ) {
Operator__UpdateAttack( self, chip );
}
}
static void Operator__Write80(Operator *self, const Chip* chip, Bit8u val ) {
Bit8u change = (self->reg80 ^ val );
Bit8u sustain; // haleyjd 09/09/10: GNUisms out!
if ( !change )
return;
self->reg80 = val;
sustain = val >> 4;
//Turn 0xf into 0x1f
sustain |= ( sustain + 1) & 0x10;
self->sustainLevel = sustain << ( ENV_BITS - 5 );
if ( change & 0x0f ) {
Operator__UpdateRelease( self, chip );
}
}
static void Operator__WriteE0(Operator *self, const Chip* chip, Bit8u val ) {
Bit8u waveForm; // haleyjd 09/09/10: GNUisms out!
if ( !(self->regE0 ^ val) )
return;
//in opl3 mode you can always selet 7 waveforms regardless of waveformselect
waveForm = val & ( ( 0x3 & chip->waveFormMask ) | (0x7 & chip->opl3Active ) );
self->regE0 = val;
#if( DBOPL_WAVE == WAVE_HANDLER )
self->waveHandler = WaveHandlerTable[ waveForm ];
#else
self->waveBase = WaveTable + WaveBaseTable[ waveForm ];
self->waveStart = WaveStartTable[ waveForm ] << WAVE_SH;
self->waveMask = WaveMaskTable[ waveForm ];
#endif
}
static inline void Operator__SetState(Operator *self, Bit8u s ) {
self->state = s;
self->volHandler = VolumeHandlerTable[ s ];
}
static inline int Operator__Silent(Operator *self) {
if ( !ENV_SILENT( self->totalLevel + self->volume ) )
return FALSE;
if ( !(self->rateZero & ( 1 << self->state ) ) )
return FALSE;
return TRUE;
}
static inline void Operator__Prepare(Operator *self, const Chip* chip ) {
self->currentLevel = self->totalLevel + (chip->tremoloValue & self->tremoloMask);
self->waveCurrent = self->waveAdd;
if ( self->vibStrength >> chip->vibratoShift ) {
Bit32s add = self->vibrato >> chip->vibratoShift;
//Sign extend over the shift value
Bit32s neg = chip->vibratoSign;
//Negate the add with -1 or 0
add = ( add ^ neg ) - neg;
self->waveCurrent += add;
}
}
static void Operator__KeyOn(Operator *self, Bit8u mask ) {
if ( !self->keyOn ) {
//Restart the frequency generator
#if( DBOPL_WAVE > WAVE_HANDLER )
self->waveIndex = self->waveStart;
#else
self->waveIndex = 0;
#endif
self->rateIndex = 0;
Operator__SetState( self, ATTACK );
}
self->keyOn |= mask;
}
static void Operator__KeyOff(Operator *self, Bit8u mask ) {
self->keyOn &= ~mask;
if ( !self->keyOn ) {
if ( self->state != OFF ) {
Operator__SetState( self, RELEASE );
}
}
}
static inline Bits Operator__GetWave(Operator *self, Bitu index, Bitu vol ) {
#if( DBOPL_WAVE == WAVE_HANDLER )
return self->waveHandler( index, vol << ( 3 - ENV_EXTRA ) );
#elif( DBOPL_WAVE == WAVE_TABLEMUL )
return(self->waveBase[ index & self->waveMask ] * MulTable[ vol >> ENV_EXTRA ]) >> MUL_SH;
#elif( DBOPL_WAVE == WAVE_TABLELOG )
Bit32s wave = self->waveBase[ index & self->waveMask ];
Bit32u total = ( wave & 0x7fff ) + vol << ( 3 - ENV_EXTRA );
Bit32s sig = ExpTable[ total & 0xff ];
Bit32u exp = total >> 8;
Bit32s neg = wave >> 16;
return((sig ^ neg) - neg) >> exp;
#else
#error "No valid wave routine"
#endif
}
static inline Bits Operator__GetSample(Operator *self, Bits modulation ) {
Bitu vol = Operator__ForwardVolume(self);
if ( ENV_SILENT( vol ) ) {
//Simply forward the wave
self->waveIndex += self->waveCurrent;
return 0;
} else {
Bitu index = Operator__ForwardWave(self);
index += modulation;
return Operator__GetWave( self, index, vol );
}
}
static void Operator__Operator(Operator *self) {
self->chanData = 0;
self->freqMul = 0;
self->waveIndex = 0;
self->waveAdd = 0;
self->waveCurrent = 0;
self->keyOn = 0;
self->ksr = 0;
self->reg20 = 0;
self->reg40 = 0;
self->reg60 = 0;
self->reg80 = 0;
self->regE0 = 0;
Operator__SetState( self, OFF );
self->rateZero = (1 << OFF);
self->sustainLevel = ENV_MAX;
self->currentLevel = ENV_MAX;
self->totalLevel = ENV_MAX;
self->volume = ENV_MAX;
self->releaseAdd = 0;
}
/*
Channel
*/
static void Channel__Channel(Channel *self) {
Operator__Operator(&self->op[0]);
Operator__Operator(&self->op[1]);
self->old[0] = self->old[1] = 0;
self->chanData = 0;
self->regB0 = 0;
self->regC0 = 0;
self->maskLeft = -1;
self->maskRight = -1;
self->feedback = 31;
self->fourMask = 0;
self->synthHandler = Channel__BlockTemplate_sm2FM;
};
static inline Operator* Channel__Op( Channel *self, Bitu index ) {
return &( ( self + (index >> 1) )->op[ index & 1 ]);
}
static void Channel__SetChanData(Channel *self, const Chip* chip, Bit32u data ) {
Bit32u change = self->chanData ^ data;
self->chanData = data;
Channel__Op( self, 0 )->chanData = data;
Channel__Op( self, 1 )->chanData = data;
//Since a frequency update triggered this, always update frequency
Operator__UpdateFrequency(Channel__Op( self, 0 ));
Operator__UpdateFrequency(Channel__Op( self, 1 ));
if ( change & ( 0xff << SHIFT_KSLBASE ) ) {
Operator__UpdateAttenuation(Channel__Op( self, 0 ));
Operator__UpdateAttenuation(Channel__Op( self, 1 ));
}
if ( change & ( 0xff << SHIFT_KEYCODE ) ) {
Operator__UpdateRates(Channel__Op( self, 0 ), chip);
Operator__UpdateRates(Channel__Op( self, 1 ), chip);
}
}
static void Channel__UpdateFrequency(Channel *self, const Chip* chip, Bit8u fourOp ) {
//Extrace the frequency bits
Bit32u data = self->chanData & 0xffff;
Bit32u kslBase = KslTable[ data >> 6 ];
Bit32u keyCode = ( data & 0x1c00) >> 9;
if ( chip->reg08 & 0x40 ) {
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 );
Channel__SetChanData( self + 0, chip, data );
if ( fourOp & 0x3f ) {
Channel__SetChanData( self + 1, chip, data );
}
}
static void Channel__WriteA0(Channel *self, const Chip* chip, Bit8u val ) {
Bit8u fourOp = chip->reg104 & chip->opl3Active & self->fourMask;
Bit32u change; // haleyjd 09/09/10: GNUisms out!
//Don't handle writes to silent fourop channels
if ( fourOp > 0x80 )
return;
change = (self->chanData ^ val ) & 0xff;
if ( change ) {
self->chanData ^= change;
Channel__UpdateFrequency( self, chip, fourOp );
}
}
static void Channel__WriteB0(Channel *self, const Chip* chip, Bit8u val ) {
Bit8u fourOp = chip->reg104 & chip->opl3Active & self->fourMask;
Bitu change; // haleyjd 09/09/10: GNUisms out!
//Don't handle writes to silent fourop channels
if ( fourOp > 0x80 )
return;
change = (self->chanData ^ ( val << 8 ) ) & 0x1f00;
if ( change ) {
self->chanData ^= change;
Channel__UpdateFrequency( self, chip, fourOp );
}
//Check for a change in the keyon/off state
if ( !(( val ^ self->regB0) & 0x20))
return;
self->regB0 = val;
if ( val & 0x20 ) {
Operator__KeyOn( Channel__Op(self, 0), 0x1 );
Operator__KeyOn( Channel__Op(self, 1), 0x1 );
if ( fourOp & 0x3f ) {
Operator__KeyOn( Channel__Op(self + 1, 0), 1 );
Operator__KeyOn( Channel__Op(self + 1, 1), 1 );
}
} else {
Operator__KeyOff( Channel__Op(self, 0), 0x1 );
Operator__KeyOff( Channel__Op(self, 1), 0x1 );
if ( fourOp & 0x3f ) {
Operator__KeyOff( Channel__Op(self + 1, 0), 1 );
Operator__KeyOff( Channel__Op(self + 1, 1), 1 );
}
}
}
static void Channel__WriteC0(Channel *self, const Chip* chip, Bit8u val ) {
Bit8u change = val ^ self->regC0;
if ( !change )
return;
self->regC0 = val;
self->feedback = ( val >> 1 ) & 7;
if ( self->feedback ) {
//We shift the input to the right 10 bit wave index value
self->feedback = 9 - self->feedback;
} else {
self->feedback = 31;
}
//Select the new synth mode
if ( chip->opl3Active ) {
//4-op mode enabled for this channel
if ( (chip->reg104 & self->fourMask) & 0x3f ) {
Channel* chan0, *chan1;
Bit8u synth; // haleyjd 09/09/10: GNUisms out!
//Check if it's the 2nd channel in a 4-op
if ( !(self->fourMask & 0x80 ) ) {
chan0 = self;
chan1 = self + 1;
} else {
chan0 = self - 1;
chan1 = self;
}
synth = ( (chan0->regC0 & 1) << 0 )| (( chan1->regC0 & 1) << 1 );
switch ( synth ) {
case 0:
chan0->synthHandler = Channel__BlockTemplate_sm3FMFM;
break;
case 1:
chan0->synthHandler = Channel__BlockTemplate_sm3AMFM;
break;
case 2:
chan0->synthHandler = Channel__BlockTemplate_sm3FMAM ;
break;
case 3:
chan0->synthHandler = Channel__BlockTemplate_sm3AMAM ;
break;
}
//Disable updating percussion channels
} else if ((self->fourMask & 0x40) && ( chip->regBD & 0x20) ) {
//Regular dual op, am or fm
} else if ( val & 1 ) {
self->synthHandler = Channel__BlockTemplate_sm3AM;
} else {
self->synthHandler = Channel__BlockTemplate_sm3FM;
}
self->maskLeft = ( val & 0x10 ) ? -1 : 0;
self->maskRight = ( val & 0x20 ) ? -1 : 0;
//opl2 active
} else {
//Disable updating percussion channels
if ( (self->fourMask & 0x40) && ( chip->regBD & 0x20 ) ) {
//Regular dual op, am or fm
} else if ( val & 1 ) {
self->synthHandler = Channel__BlockTemplate_sm2AM;
} else {
self->synthHandler = Channel__BlockTemplate_sm2FM;
}
}
}
static void Channel__ResetC0(Channel *self, const Chip* chip ) {
Bit8u val = self->regC0;
self->regC0 ^= 0xff;
Channel__WriteC0( self, chip, val );
};
static inline void Channel__GeneratePercussion(Channel *self, Chip* chip,
Bit32s* output, int opl3Mode ) {
Channel* chan = self;
//BassDrum
Bit32s mod = (Bit32u)((self->old[0] + self->old[1])) >> self->feedback;
Bit32s sample; // haleyjd 09/09/10
Bit32u noiseBit;
Bit32u c2;
Bit32u c5;
Bit32u phaseBit;
Bit32u hhVol;
Bit32u sdVol;
Bit32u tcVol;
self->old[0] = self->old[1];
self->old[1] = Operator__GetSample( Channel__Op(self, 0), mod );
//When bassdrum is in AM mode first operator is ignoed
if ( chan->regC0 & 1 ) {
mod = 0;
} else {
mod = self->old[0];
}
sample = Operator__GetSample( Channel__Op(self, 1), mod );
//Precalculate stuff used by other outputs
noiseBit = Chip__ForwardNoise(chip) & 0x1;
c2 = Operator__ForwardWave(Channel__Op(self, 2));
c5 = Operator__ForwardWave(Channel__Op(self, 5));
phaseBit = (((c2 & 0x88) ^ ((c2<<5) & 0x80)) | ((c5 ^ (c5<<2)) & 0x20)) ? 0x02 : 0x00;
//Hi-Hat
hhVol = Operator__ForwardVolume(Channel__Op(self, 2));
if ( !ENV_SILENT( hhVol ) ) {
Bit32u hhIndex = (phaseBit<<8) | (0x34 << ( phaseBit ^ (noiseBit << 1 )));
sample += Operator__GetWave( Channel__Op(self, 2), hhIndex, hhVol );
}
//Snare Drum
sdVol = Operator__ForwardVolume( Channel__Op(self, 3) );
if ( !ENV_SILENT( sdVol ) ) {
Bit32u sdIndex = ( 0x100 + (c2 & 0x100) ) ^ ( noiseBit << 8 );
sample += Operator__GetWave( Channel__Op(self, 3), sdIndex, sdVol );
}
//Tom-tom
sample += Operator__GetSample( Channel__Op(self, 4), 0 );
//Top-Cymbal
tcVol = Operator__ForwardVolume(Channel__Op(self, 5));
if ( !ENV_SILENT( tcVol ) ) {
Bit32u tcIndex = (1 + phaseBit) << 8;
sample += Operator__GetWave( Channel__Op(self, 5), tcIndex, tcVol );
}
sample <<= 1;
if ( opl3Mode ) {
output[0] += sample;
output[1] += sample;
} else {
output[0] += sample;
}
}
Channel* Channel__BlockTemplate(Channel *self, Chip* chip,
Bit32u samples, Bit32s* output,
SynthMode mode ) {
Bitu i;
switch( mode ) {
case sm2AM:
case sm3AM:
if ( Operator__Silent(Channel__Op(self, 0))
&& Operator__Silent(Channel__Op(self, 1))) {
self->old[0] = self->old[1] = 0;
return(self + 1);
}
break;
case sm2FM:
case sm3FM:
if ( Operator__Silent(Channel__Op(self, 1))) {
self->old[0] = self->old[1] = 0;
return (self + 1);
}
break;
case sm3FMFM:
if ( Operator__Silent(Channel__Op(self, 3))) {
self->old[0] = self->old[1] = 0;
return (self + 2);
}
break;
case sm3AMFM:
if ( Operator__Silent( Channel__Op(self, 0) )
&& Operator__Silent( Channel__Op(self, 3) )) {
self->old[0] = self->old[1] = 0;
return (self + 2);
}
break;
case sm3FMAM:
if ( Operator__Silent( Channel__Op(self, 1))
&& Operator__Silent( Channel__Op(self, 3))) {
self->old[0] = self->old[1] = 0;
return (self + 2);
}
break;
case sm3AMAM:
if ( Operator__Silent( Channel__Op(self, 0) )
&& Operator__Silent( Channel__Op(self, 2) )
&& Operator__Silent( Channel__Op(self, 3) )) {
self->old[0] = self->old[1] = 0;
return (self + 2);
}
break;
default:
abort();
}
//Init the operators with the the current vibrato and tremolo values
Operator__Prepare( Channel__Op( self, 0 ), chip );
Operator__Prepare( Channel__Op( self, 1 ), chip );
if ( mode > sm4Start ) {
Operator__Prepare( Channel__Op( self, 2 ), chip );
Operator__Prepare( Channel__Op( self, 3 ), chip );
}
if ( mode > sm6Start ) {
Operator__Prepare( Channel__Op( self, 4 ), chip );
Operator__Prepare( Channel__Op( self, 5 ), chip );
}
for ( i = 0; i < samples; i++ ) {
Bit32s mod; // haleyjd 09/09/10: GNUisms out!
Bit32s sample;
Bit32s out0;
//Early out for percussion handlers
if ( mode == sm2Percussion ) {
Channel__GeneratePercussion( self, chip, output + i, FALSE );
continue; //Prevent some unitialized value bitching
} else if ( mode == sm3Percussion ) {
Channel__GeneratePercussion( self, chip, output + i * 2, TRUE );
continue; //Prevent some unitialized value bitching
}
//Do unsigned shift so we can shift out all bits but still stay in 10 bit range otherwise
mod = (Bit32u)((self->old[0] + self->old[1])) >> self->feedback;
self->old[0] = self->old[1];
self->old[1] = Operator__GetSample( Channel__Op(self, 0), mod );
sample = 0;
out0 = self->old[0];
if ( mode == sm2AM || mode == sm3AM ) {