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VARCem/src/sound/dbopl.cpp
waltje 7f4ddcd70b Import of all sources.
2018-02-20 21:52:53 -05:00

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/*
* VARCem Virtual Archaelogical Computer EMulator.
* An emulator of (mostly) x86-based PC systems and devices,
* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
* spanning the era between 1981 and 1995.
*
* This file is part of the VARCem Project.
*
* DOSBox implementation of a combined Yamaha YMF262 and 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
* Maybe not use class method pointers but a regular function
* pointers with operator as first parameter.
* Fix panning for the Percussion channels, would any opl3
* player use it and actually really change it though?
* Check if having the same accuracy in all frequency
* multipliers sounds better or not
* DUNNO Keyon in 4op, switch to 2op without keyoff.
*
* Version: @(#)dbopl.cpp 1.0.1 2018/02/14
*
* Based on (dbopl.cpp,v 1.10 2009-06-10 19:54:51 harekiet)
*
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* Miran Grca, <mgrca8@gmail.com>
* The DOSBox Team
*
* Copyright 2017,2018 Fred N. van Kempen.
* Copyright 2016-2018 Miran Grca.
* Copyright 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the:
*
* Free Software Foundation, Inc.
* 59 Temple Place - Suite 330
* Boston, MA 02111-1307
* USA.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "dbopl.h"
#ifndef PI
#define PI 3.14159265358979323846
#endif
namespace DBOPL {
#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
//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
inline void Operator::UpdateAttack( const Chip* chip ) {
Bit8u rate = reg60 >> 4;
if ( rate ) {
Bit8u val = (rate << 2) + ksr;
attackAdd = chip->attackRates[ val ];
rateZero &= ~(1 << ATTACK);
} else {
attackAdd = 0;
rateZero |= (1 << ATTACK);
}
}
inline void Operator::UpdateDecay( const Chip* chip ) {
Bit8u rate = reg60 & 0xf;
if ( rate ) {
Bit8u val = (rate << 2) + ksr;
decayAdd = chip->linearRates[ val ];
rateZero &= ~(1 << DECAY);
} else {
decayAdd = 0;
rateZero |= (1 << DECAY);
}
}
inline void Operator::UpdateRelease( const Chip* chip ) {
Bit8u rate = reg80 & 0xf;
if ( rate ) {
Bit8u val = (rate << 2) + ksr;
releaseAdd = chip->linearRates[ val ];
rateZero &= ~(1 << RELEASE);
if ( !(reg20 & MASK_SUSTAIN ) ) {
rateZero &= ~( 1 << SUSTAIN );
}
} else {
rateZero |= (1 << RELEASE);
releaseAdd = 0;
if ( !(reg20 & MASK_SUSTAIN ) ) {
rateZero |= ( 1 << SUSTAIN );
}
}
}
inline void Operator::UpdateAttenuation( ) {
Bit8u kslBase = (Bit8u)((chanData >> SHIFT_KSLBASE) & 0xff);
Bit32u tl = reg40 & 0x3f;
Bit8u 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;
}
void Operator::UpdateFrequency( ) {
Bit32u freq = chanData & (( 1 << 10 ) - 1);
Bit32u block = (chanData >> 10) & 0xff;
#ifdef WAVE_PRECISION
block = 7 - block;
waveAdd = ( freq * freqMul ) >> block;
#else
waveAdd = ( freq << block ) * freqMul;
#endif
if ( reg20 & MASK_VIBRATO ) {
vibStrength = (Bit8u)(freq >> 7);
#ifdef WAVE_PRECISION
vibrato = ( vibStrength * freqMul ) >> block;
#else
vibrato = ( vibStrength << block ) * freqMul;
#endif
} else {
vibStrength = 0;
vibrato = 0;
}
}
void Operator::UpdateRates( const Chip* chip ) {
//Mame seems to reverse this where enabling ksr actually lowers
//the rate, but pdf manuals says otherwise?
Bit8u newKsr = (Bit8u)((chanData >> SHIFT_KEYCODE) & 0xff);
if ( !( reg20 & MASK_KSR ) ) {
newKsr >>= 2;
}
if ( ksr == newKsr )
return;
ksr = newKsr;
UpdateAttack( chip );
UpdateDecay( chip );
UpdateRelease( chip );
}
INLINE Bit32s Operator::RateForward( Bit32u add ) {
rateIndex += add;
Bit32s ret = rateIndex >> RATE_SH;
rateIndex = rateIndex & RATE_MASK;
return ret;
}
template< Operator::State yes>
Bits Operator::TemplateVolume( ) {
Bit32s vol = volume;
Bit32s change;
switch ( yes ) {
case OFF:
return ENV_MAX;
case ATTACK:
change = RateForward( attackAdd );
if ( !change )
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 ( GCC_UNLIKELY(vol >= sustainLevel) ) {
//Check if we didn't overshoot max attenuation, then just go off
if ( GCC_UNLIKELY(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 ) {
return vol;
}
//In sustain phase, but not sustaining, do regular release
case RELEASE:
vol += RateForward( releaseAdd );;
if ( GCC_UNLIKELY(vol >= ENV_MAX) ) {
volume = ENV_MAX;
SetState( OFF );
return ENV_MAX;
}
break;
}
volume = vol;
return vol;
}
static const VolumeHandler VolumeHandlerTable[5] = {
&Operator::TemplateVolume< Operator::OFF >,
&Operator::TemplateVolume< Operator::RELEASE >,
&Operator::TemplateVolume< Operator::SUSTAIN >,
&Operator::TemplateVolume< Operator::DECAY >,
&Operator::TemplateVolume< Operator::ATTACK >
};
INLINE Bitu Operator::ForwardVolume() {
return currentLevel + (this->*volHandler)();
}
INLINE Bitu Operator::ForwardWave() {
waveIndex += waveCurrent;
return waveIndex >> WAVE_SH;
}
void Operator::Write20( const Chip* chip, Bit8u val ) {
Bit8u change = (reg20 ^ val );
if ( !change )
return;
reg20 = val;
//Shift the tremolo bit over the entire register, saved a branch, YES!
tremoloMask = (Bit8s)(val) >> 7;
tremoloMask &= ~(( 1 << ENV_EXTRA ) -1);
//Update specific features based on changes
if ( change & MASK_KSR ) {
UpdateRates( chip );
}
//With sustain enable the volume doesn't change
if ( reg20 & MASK_SUSTAIN || ( !releaseAdd ) ) {
rateZero |= ( 1 << SUSTAIN );
} else {
rateZero &= ~( 1 << SUSTAIN );
}
//Frequency multiplier or vibrato changed
if ( change & (0xf | MASK_VIBRATO) ) {
freqMul = chip->freqMul[ val & 0xf ];
UpdateFrequency();
}
}
void Operator::Write40( const Chip* /*chip*/, Bit8u val ) {
if (!(reg40 ^ val ))
return;
reg40 = val;
UpdateAttenuation( );
}
void Operator::Write60( const Chip* chip, Bit8u val ) {
Bit8u change = reg60 ^ val;
reg60 = val;
if ( change & 0x0f ) {
UpdateDecay( chip );
}
if ( change & 0xf0 ) {
UpdateAttack( chip );
}
}
void Operator::Write80( const Chip* chip, Bit8u val ) {
Bit8u change = (reg80 ^ val );
if ( !change )
return;
reg80 = val;
Bit8u sustain = val >> 4;
//Turn 0xf into 0x1f
sustain |= ( sustain + 1) & 0x10;
sustainLevel = sustain << ( ENV_BITS - 5 );
if ( change & 0x0f ) {
UpdateRelease( chip );
}
}
void Operator::WriteE0( const Chip* chip, Bit8u val ) {
if ( !(regE0 ^ val) )
return;
//in opl3 mode you can always selet 7 waveforms regardless of waveformselect
Bit8u waveForm = val & ( ( 0x3 & chip->waveFormMask ) | (0x7 & chip->opl3Active ) );
regE0 = val;
#if ( DBOPL_WAVE == WAVE_HANDLER )
waveHandler = WaveHandlerTable[ waveForm ];
#else
waveBase = WaveTable + WaveBaseTable[ waveForm ];
waveStart = WaveStartTable[ waveForm ] << WAVE_SH;
waveMask = WaveMaskTable[ waveForm ];
#endif
}
INLINE void Operator::SetState( Bit8u s ) {
state = s;
volHandler = VolumeHandlerTable[ s ];
}
INLINE bool Operator::Silent() const {
if ( !ENV_SILENT( totalLevel + volume ) )
return false;
if ( !(rateZero & ( 1 << state ) ) )
return false;
return true;
}
INLINE void Operator::Prepare( const Chip* chip ) {
currentLevel = totalLevel + (chip->tremoloValue & tremoloMask);
waveCurrent = waveAdd;
if ( vibStrength >> chip->vibratoShift ) {
Bit32s add = vibrato >> chip->vibratoShift;
//Sign extend over the shift value
Bit32s neg = chip->vibratoSign;
//Negate the add with -1 or 0
add = ( add ^ neg ) - neg;
waveCurrent += add;
}
}
void Operator::KeyOn( Bit8u mask ) {
if ( !keyOn ) {
//Restart the frequency generator
#if ( DBOPL_WAVE > WAVE_HANDLER )
waveIndex = waveStart;
#else
waveIndex = 0;
#endif
rateIndex = 0;
SetState( ATTACK );
}
keyOn |= mask;
}
void Operator::KeyOff( Bit8u mask ) {
keyOn &= ~mask;
if ( !keyOn ) {
if ( state != OFF ) {
SetState( RELEASE );
}
}
}
INLINE Bits Operator::GetWave( Bitu index, Bitu vol ) {
#if ( DBOPL_WAVE == WAVE_HANDLER )
return waveHandler( index, vol << ( 3 - ENV_EXTRA ) );
#elif ( DBOPL_WAVE == WAVE_TABLEMUL )
return (waveBase[ index & waveMask ] * MulTable[ vol >> ENV_EXTRA ]) >> MUL_SH;
#elif ( DBOPL_WAVE == WAVE_TABLELOG )
Bit32s wave = waveBase[ index & 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
}
Bits INLINE Operator::GetSample( Bits modulation ) {
Bitu vol = ForwardVolume();
if ( ENV_SILENT( vol ) ) {
//Simply forward the wave
waveIndex += waveCurrent;
return 0;
} else {
Bitu index = ForwardWave();
index += modulation;
return GetWave( index, vol );
}
}
Operator::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;
}
/*
Channel
*/
Channel::Channel() {
old[0] = old[1] = 0;
chanData = 0;
regB0 = 0;
regC0 = 0;
maskLeft = -1;
maskRight = -1;
feedback = 31;
fourMask = 0;
synthHandler = &Channel::BlockTemplate< sm2FM >;
};
void Channel::SetChanData( const Chip* chip, Bit32u data ) {
Bit32u 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 ) ) {
Op( 0 )->UpdateAttenuation();
Op( 1 )->UpdateAttenuation();
}
if ( change & ( 0xff << SHIFT_KEYCODE ) ) {
Op( 0 )->UpdateRates( chip );
Op( 1 )->UpdateRates( chip );
}
}
void Channel::UpdateFrequency( const Chip* chip, Bit8u fourOp ) {
//Extrace the frequency bits
Bit32u data = 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 );
( this + 0 )->SetChanData( chip, data );
if ( fourOp & 0x3f ) {
( this + 1 )->SetChanData( chip, data );
}
}
void Channel::WriteA0( const Chip* chip, Bit8u val ) {
Bit8u fourOp = chip->reg104 & chip->opl3Active & fourMask;
//Don't handle writes to silent fourop channels
if ( fourOp > 0x80 )
return;
Bit32u change = (chanData ^ val ) & 0xff;
if ( change ) {
chanData ^= change;
UpdateFrequency( chip, fourOp );
}
}
void Channel::WriteB0( const Chip* chip, Bit8u val ) {
Bit8u fourOp = chip->reg104 & chip->opl3Active & fourMask;
//Don't handle writes to silent fourop channels
if ( fourOp > 0x80 )
return;
Bitu change = (chanData ^ ( val << 8 ) ) & 0x1f00;
if ( change ) {
chanData ^= change;
UpdateFrequency( chip, fourOp );
}
//Check for a change in the keyon/off state
if ( !(( val ^ regB0) & 0x20))
return;
regB0 = val;
if ( val & 0x20 ) {
Op(0)->KeyOn( 0x1 );
Op(1)->KeyOn( 0x1 );
if ( fourOp & 0x3f ) {
( this + 1 )->Op(0)->KeyOn( 1 );
( this + 1 )->Op(1)->KeyOn( 1 );
}
} else {
Op(0)->KeyOff( 0x1 );
Op(1)->KeyOff( 0x1 );
if ( fourOp & 0x3f ) {
( this + 1 )->Op(0)->KeyOff( 1 );
( this + 1 )->Op(1)->KeyOff( 1 );
}
}
}
void Channel::WriteC0( const Chip* chip, Bit8u val ) {
Bit8u change = val ^ regC0;
if ( !change )
return;
regC0 = val;
feedback = ( val >> 1 ) & 7;
if ( feedback ) {
//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 ) {
//4-op mode enabled for this channel
if ( (chip->reg104 & fourMask) & 0x3f ) {
Channel* chan0, *chan1;
//Check if it's the 2nd channel in a 4-op
if ( !(fourMask & 0x80 ) ) {
chan0 = this;
chan1 = this + 1;
} else {
chan0 = this - 1;
chan1 = this;
}
Bit8u 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 ((fourMask & 0x40) && ( chip->regBD & 0x20) ) {
//Regular dual op, am or fm
} else if ( val & 1 ) {
synthHandler = &Channel::BlockTemplate< sm3AM >;
} else {
synthHandler = &Channel::BlockTemplate< sm3FM >;
}
maskLeft = ( val & 0x10 ) ? -1 : 0;
maskRight = ( val & 0x20 ) ? -1 : 0;
//opl2 active
} else {
//Disable updating percussion channels
if ( (fourMask & 0x40) && ( chip->regBD & 0x20 ) ) {
//Regular dual op, am or fm
} else if ( val & 1 ) {
synthHandler = &Channel::BlockTemplate< sm2AM >;
} else {
synthHandler = &Channel::BlockTemplate< sm2FM >;
}
}
}
void Channel::ResetC0( const Chip* chip ) {
Bit8u val = regC0;
regC0 ^= 0xff;
WriteC0( chip, val );
};
template< bool opl3Mode>
INLINE void Channel::GeneratePercussion( Chip* chip, Bit32s* output ) {
Channel* chan = this;
//BassDrum
Bit32s mod = (Bit32u)((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 ) {
mod = 0;
} else {
mod = old[0];
}
Bit32s sample = Op(1)->GetSample( mod );
//Precalculate stuff used by other outputs
Bit32u noiseBit = chip->ForwardNoise() & 0x1;
Bit32u c2 = Op(2)->ForwardWave();
Bit32u c5 = Op(5)->ForwardWave();
Bit32u phaseBit = (((c2 & 0x88) ^ ((c2<<5) & 0x80)) | ((c5 ^ (c5<<2)) & 0x20)) ? 0x02 : 0x00;
//Hi-Hat
Bit32u hhVol = Op(2)->ForwardVolume();
if ( !ENV_SILENT( hhVol ) ) {
Bit32u hhIndex = (phaseBit<<8) | (0x34 << ( phaseBit ^ (noiseBit << 1 )));
sample += Op(2)->GetWave( hhIndex, hhVol );
}
//Snare Drum
Bit32u sdVol = Op(3)->ForwardVolume();
if ( !ENV_SILENT( sdVol ) ) {
Bit32u sdIndex = ( 0x100 + (c2 & 0x100) ) ^ ( noiseBit << 8 );
sample += Op(3)->GetWave( sdIndex, sdVol );
}
//Tom-tom
sample += Op(4)->GetSample( 0 );
//Top-Cymbal
Bit32u tcVol = Op(5)->ForwardVolume();
if ( !ENV_SILENT( tcVol ) ) {
Bit32u tcIndex = (1 + phaseBit) << 8;
sample += Op(5)->GetWave( tcIndex, tcVol );
}
sample <<= 1;
if ( opl3Mode ) {
output[0] += sample;
output[1] += sample;
} else {
output[0] += sample;
}
}
template<SynthMode mode>
Channel* Channel::BlockTemplate( Chip* chip, Bit32u samples, Bit32s* output ) {
switch( mode ) {
case sm2AM:
case sm3AM:
if ( Op(0)->Silent() && Op(1)->Silent() ) {
old[0] = old[1] = 0;
return (this + 1);
}
break;
case sm2FM:
case sm3FM:
if ( Op(1)->Silent() ) {
old[0] = old[1] = 0;
return (this + 1);
}
break;
case sm3FMFM:
if ( Op(3)->Silent() ) {
old[0] = old[1] = 0;
return (this + 2);
}
break;
case sm3AMFM:
if ( Op(0)->Silent() && Op(3)->Silent() ) {
old[0] = old[1] = 0;
return (this + 2);
}
break;
case sm3FMAM:
if ( Op(1)->Silent() && Op(3)->Silent() ) {
old[0] = old[1] = 0;
return (this + 2);
}
break;
case sm3AMAM:
if ( Op(0)->Silent() && Op(2)->Silent() && Op(3)->Silent() ) {
old[0] = old[1] = 0;
return (this + 2);
}
break;
case sm2Percussion:
case sm3Percussion:
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 i = 0; i < samples; i++ ) {
//Early out for percussion handlers
if ( mode == sm2Percussion ) {
GeneratePercussion<false>( chip, output + i );
continue; //Prevent some unitialized value bitching
} else if ( mode == sm3Percussion ) {
GeneratePercussion<true>( chip, output + 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 mod = (Bit32u)((old[0] + old[1])) >> feedback;
old[0] = old[1];
old[1] = Op(0)->GetSample( mod );
Bit32s sample;
Bit32s 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 next = Op(1)->GetSample( out0 );
next = Op(2)->GetSample( next );
sample = Op(3)->GetSample( next );
} else if ( mode == sm3AMFM ) {
sample = out0;
Bits 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 next = Op(2)->GetSample( 0 );
sample += Op(3)->GetSample( next );
} else if ( mode == sm3AMAM ) {
sample = out0;
Bits next = Op(1)->GetSample( 0 );
sample += Op(2)->GetSample( next );
sample += Op(3)->GetSample( 0 );
}
switch( mode ) {
case sm2AM:
case sm2FM:
if (chip->is_opl3)
{
output[ i * 2 + 0 ] += sample;
output[ i * 2 + 1 ] += sample;
}
else
output[ i ] += sample;
break;
case sm3AM:
case sm3FM:
case sm3FMFM:
case sm3AMFM:
case sm3FMAM:
case sm3AMAM:
output[ i * 2 + 0 ] += sample & maskLeft;
output[ i * 2 + 1 ] += sample & maskRight;
break;
case sm2Percussion:
case sm3Percussion:
break;
}
}
switch( mode ) {
case sm2AM:
case sm2FM:
case sm3AM:
case sm3FM:
return ( this + 1 );
case sm3FMFM:
case sm3AMFM:
case sm3FMAM:
case sm3AMAM:
return( this + 2 );
case sm2Percussion:
case sm3Percussion:
return( this + 3 );
}
return 0;
}
/*
Chip
*/
Chip::Chip() {
reg08 = 0;
reg04 = 0;
regBD = 0;
reg104 = 0;
opl3Active = 0;
}
INLINE Bit32u Chip::ForwardNoise() {
noiseCounter += noiseAdd;
Bitu count = noiseCounter >> LFO_SH;
noiseCounter &= WAVE_MASK;
for ( ; count > 0; --count ) {
//Noise calculation from mame
noiseValue ^= ( 0x800302 ) & ( 0 - (noiseValue & 1 ) );
noiseValue >>= 1;
}
return noiseValue;
}
INLINE Bit32u Chip::ForwardLFO( Bit32u samples ) {
//Current vibrato value, runs 4x slower than tremolo
vibratoSign = ( VibratoTable[ vibratoIndex >> 2] ) >> 7;
vibratoShift = ( VibratoTable[ vibratoIndex >> 2] & 7) + vibratoStrength;
tremoloValue = TremoloTable[ tremoloIndex ] >> tremoloStrength;
//Check hom many samples there can be done before the value changes
Bit32u todo = LFO_MAX - lfoCounter;
Bit32u 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 = ( vibratoIndex + 1 ) & 31;
//Clip tremolo to the the table size
if ( tremoloIndex + 1 < TREMOLO_TABLE )
++tremoloIndex;
else
tremoloIndex = 0;
}
return count;
}
void Chip::WriteBD( Bit8u val ) {
Bit8u change = regBD ^ val;
if ( !change )
return;
regBD = val;
//TODO could do this with shift and xor?
vibratoStrength = (val & 0x40) ? 0x00 : 0x01;
tremoloStrength = (val & 0x80) ? 0x00 : 0x02;
if ( val & 0x20 ) {
//Drum was just enabled, make sure channel 6 has the right synth
if ( change & 0x20 ) {
// if ( opl3Active ) {
if ( is_opl3 ) {
chan[6].synthHandler = &Channel::BlockTemplate< sm3Percussion >;
} else {
chan[6].synthHandler = &Channel::BlockTemplate< sm2Percussion >;
}
}
//Bass Drum
if ( val & 0x10 ) {
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 ) {
chan[7].op[0].KeyOn( 0x2 );
} else {
chan[7].op[0].KeyOff( 0x2 );
}
//Snare
if ( val & 0x8 ) {
chan[7].op[1].KeyOn( 0x2 );
} else {
chan[7].op[1].KeyOff( 0x2 );
}
//Tom-Tom
if ( val & 0x4 ) {
chan[8].op[0].KeyOn( 0x2 );
} else {
chan[8].op[0].KeyOff( 0x2 );
}
//Top Cymbal
if ( val & 0x2 ) {
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 ) {
//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 );
}
}
#define REGOP( _FUNC_ ) \
index = ( ( reg >> 3) & 0x20 ) | ( reg & 0x1f ); \
if ( OpOffsetTable[ index ] ) { \
Operator* regOp = (Operator*)( ((char *)this ) + OpOffsetTable[ index ] ); \
regOp->_FUNC_( this, val ); \
}
#define REGCHAN( _FUNC_ ) \
index = ( ( reg >> 4) & 0x10 ) | ( reg & 0xf ); \
if ( ChanOffsetTable[ index ] ) { \
Channel* regChan = (Channel*)( ((char *)this ) + ChanOffsetTable[ index ] ); \
regChan->_FUNC_( this, val ); \
}
void Chip::WriteReg( Bit32u reg, Bit8u val ) {
Bitu index;
switch ( (reg & 0xf0) >> 4 ) {
case 0x00 >> 4:
if ( reg == 0x01 ) {
waveFormMask = ( val & 0x20 ) ? 0x7 : 0x0;
} else if ( reg == 0x104 ) {
//Only detect changes in lowest 6 bits
if ( !((reg104 ^ val) & 0x3f) )
return;
//Always keep the highest bit enabled, for checking > 0x80
reg104 = 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 ) )
return;
opl3Active = ( val & 1 ) ? 0xff : 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 = val;
}
case 0x10 >> 4:
break;
case 0x20 >> 4:
case 0x30 >> 4:
REGOP( Write20 );
break;
case 0x40 >> 4:
case 0x50 >> 4:
REGOP( Write40 );
break;
case 0x60 >> 4:
case 0x70 >> 4:
REGOP( Write60 );
break;
case 0x80 >> 4:
case 0x90 >> 4:
REGOP( Write80 );
break;
case 0xa0 >> 4:
REGCHAN( WriteA0 );
break;
case 0xb0 >> 4:
if ( reg == 0xbd ) {
WriteBD( val );
} else {
REGCHAN( WriteB0 );
}
break;
case 0xc0 >> 4:
REGCHAN( WriteC0 );
case 0xd0 >> 4:
break;
case 0xe0 >> 4:
case 0xf0 >> 4:
REGOP( WriteE0 );
break;
}
}
Bit32u Chip::WriteAddr( Bit32u port, Bit8u val ) {
switch ( port & 3 ) {
case 0:
return val;
case 2:
if ( opl3Active || (val == 0x05) )
return 0x100 | val;
else
return val;
}
return 0;
}
void Chip::GenerateBlock2( Bitu total, Bit32s* output ) {
while ( total > 0 ) {
Bit32u samples = ForwardLFO( total );
memset(output, 0, sizeof(Bit32s) * samples);
int count = 0;
for( Channel* ch = chan; ch < chan + 9; ) {
count++;
ch = (ch->*(ch->synthHandler))( this, samples, output );
}
total -= samples;
output += samples;
}
}
void Chip::GenerateBlock3( Bitu total, Bit32s* output ) {
while ( total > 0 ) {
Bit32u samples = ForwardLFO( total );
memset(output, 0, sizeof(Bit32s) * samples *2);
int count = 0;
for( Channel* ch = chan; ch < chan + 18; ) {
count++;
ch = (ch->*(ch->synthHandler))( this, samples, output );
}
total -= samples;
output += samples * 2;
}
}
void Chip::Setup( Bit32u rate, int chip_is_opl3 ) {
double original = OPLRATE;
// double original = rate;
double scale = original / (double)rate;
is_opl3 = chip_is_opl3;
//Noise counter is run at the same precision as general waves
noiseAdd = (Bit32u)( 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)( 0.5 + scale * ( 1 << LFO_SH ) );
lfoCounter = 0;
vibratoIndex = 0;
tremoloIndex = 0;
//With higher octave this gets shifted up
//-1 since the freqCreateTable = *2
#ifdef WAVE_PRECISION
double freqScale = ( 1 << 7 ) * scale * ( 1 << ( WAVE_SH - 1 - 10));
for ( int i = 0; i < 16; i++ ) {
freqMul[i] = (Bit32u)( 0.5 + freqScale * FreqCreateTable[ i ] );
}
#else
Bit32u freqScale = (Bit32u)( 0.5 + scale * ( 1 << ( WAVE_SH - 1 - 10)));
for ( int i = 0; i < 16; i++ ) {
freqMul[i] = freqScale * FreqCreateTable[ i ];
}
#endif
//-3 since the real envelope takes 8 steps to reach the single value we supply
for ( Bit8u i = 0; i < 76; i++ ) {
Bit8u index, shift;
EnvelopeSelect( i, index, shift );
linearRates[i] = (Bit32u)( scale * (EnvelopeIncreaseTable[ index ] << ( RATE_SH + ENV_EXTRA - shift - 3 )));
}
//Generate the best matching attack rate
for ( Bit8u i = 0; i < 62; i++ ) {
Bit8u index, shift;
EnvelopeSelect( i, index, shift );
//Original amount of samples the attack would take
Bit32s original = (Bit32u)( (AttackSamplesTable[ index ] << shift) / scale);
Bit32s guessAdd = (Bit32u)( scale * (EnvelopeIncreaseTable[ index ] << ( RATE_SH - shift - 3 )));
Bit32s bestAdd = guessAdd;
Bit32u bestDiff = 1 << 30;
for( Bit32u passes = 0; passes < 16; passes ++ ) {
Bit32s volume = ENV_MAX;
Bit32s samples = 0;
Bit32u count = 0;
while ( volume > 0 && samples < original * 2 ) {
count += guessAdd;
Bit32s change = count >> RATE_SH;
count &= RATE_MASK;
if ( GCC_UNLIKELY(change) ) { // less than 1 %
volume += ( ~volume * change ) >> 3;
}
samples++;
}
Bit32s diff = original - samples;
Bit32u lDiff = labs( diff );
//Init last on first pass
if ( lDiff < bestDiff ) {
bestDiff = lDiff;
bestAdd = guessAdd;
if ( !bestDiff )
break;
}
//Below our target
if ( diff < 0 ) {
//Better than the last time
Bit32s mul = ((original - diff) << 12) / original;
guessAdd = ((guessAdd * mul) >> 12);
guessAdd++;
} else if ( diff > 0 ) {
Bit32s mul = ((original - diff) << 12) / original;
guessAdd = (guessAdd * mul) >> 12;
guessAdd--;
}
}
attackRates[i] = bestAdd;
}
for ( Bit8u 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 );
}
}
static bool doneTables = false;
void InitTables( void ) {
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 + ( 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;
}
#endif
#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)( 0.5 - log10( sin( (i + 0.5) * (PI / 512.0) ) ) / log10(2.0)*256 );
}
#endif
#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 + ( pow(2.0, -1.0 + ( 255 - s) * ( 1.0 /256 ) )) * ( 1 << MUL_SH ));
MulTable[i] = (Bit16u)(val);
}
//Sine Wave Base
for ( int i = 0; i < 512; i++ ) {
WaveTable[ 0x0200 + i ] = (Bit16s)(sin( (i + 0.5) * (PI / 512.0) ) * 4084);
WaveTable[ 0x0000 + i ] = -WaveTable[ 0x200 + i ];
}
//Exponential wave
for ( int i = 0; i < 256; i++ ) {
WaveTable[ 0x700 + i ] = (Bit16s)( 0.5 + ( pow(2.0, -1.0 + ( 255 - i * 8) * ( 1.0 /256 ) ) ) * 4085 );
WaveTable[ 0x6ff - i ] = -WaveTable[ 0x700 + i ];
}
#endif
#if ( DBOPL_WAVE == WAVE_TABLELOG )
//Sine Wave Base
for ( int i = 0; i < 512; i++ ) {
WaveTable[ 0x0200 + i ] = (Bit16s)( 0.5 - log10( sin( (i + 0.5) * (PI / 512.0) ) ) / log10(2.0)*256 );
WaveTable[ 0x0000 + i ] = ((Bit16s)0x8000) | WaveTable[ 0x200 + i];
}
//Exponential wave
for ( int i = 0; i < 256; i++ ) {
WaveTable[ 0x700 + i ] = i * 8;
WaveTable[ 0x6ff - i ] = ((Bit16s)0x8000) | i * 8;
}
#endif
// | |//\\|____|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 ];
}
#endif
//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 ] = val * 4;
}
}
//Create the Tremolo table, just increase and decrease a triangle wave
for ( Bit8u i = 0; i < TREMOLO_TABLE / 2; i++ ) {
Bit8u val = 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
DBOPL::Chip* chip = 0;
for ( Bitu i = 0; i < 32; i++ ) {
Bitu index = i & 0xf;
if ( index >= 9 ) {
ChanOffsetTable[i] = 0;
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;
intptr_t blah = reinterpret_cast<intptr_t>( &(chip->chan[ index ]) );
ChanOffsetTable[i] = blah;
}
//Same for operators
for ( Bitu i = 0; i < 64; i++ ) {
if ( i % 8 >= 6 || ( (i / 8) % 4 == 3 ) ) {
OpOffsetTable[i] = 0;
continue;
}
Bitu 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 opNum = ( i % 8 ) / 3;
DBOPL::Channel* chan = 0;
intptr_t blah = reinterpret_cast<intptr_t>( &(chan->op[opNum]) );
OpOffsetTable[i] = ChanOffsetTable[ chNum ] + blah;
}
#if 0
//Stupid checks if table's are correct
for ( Bitu i = 0; i < 18; i++ ) {
Bit32u find = (Bit16u)( &(chip->chan[ i ]) );
for ( Bitu c = 0; c < 32; c++ ) {
if ( ChanOffsetTable[c] == find ) {
find = 0;
break;
}
}
if ( find ) {
find = find;
}
}
for ( Bitu i = 0; i < 36; i++ ) {
Bit32u find = (Bit16u)( &(chip->chan[ i / 2 ].op[i % 2]) );
for ( Bitu c = 0; c < 64; c++ ) {
if ( OpOffsetTable[c] == find ) {
find = 0;
break;
}
}
if ( find ) {
find = find;
}
}
#endif
}
/*Bit32u Handler::WriteAddr( Bit32u port, Bit8u val ) {
return chip.WriteAddr( port, val );
}
void Handler::WriteReg( Bit32u addr, Bit8u val ) {
chip.WriteReg( addr, val );
}
void Handler::Generate( MixerChannel* chan, Bitu samples ) {
Bit32s buffer[ 512 * 2 ];
if ( GCC_UNLIKELY(samples > 512) )
samples = 512;
if ( !chip.opl3Active ) {
chip.GenerateBlock2( samples, buffer );
chan->AddSamples_m32( samples, buffer );
} else {
chip.GenerateBlock3( samples, buffer );
chan->AddSamples_s32( samples, buffer );
}
}
void Handler::Init( Bitu rate ) {
InitTables();
chip.Setup( rate );
}*/
}; //Namespace DBOPL
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