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Diffstat (limited to 'opl/dbopl.h')
| -rw-r--r-- | opl/dbopl.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/opl/dbopl.h b/opl/dbopl.h new file mode 100644 index 00000000..a5c10bfd --- /dev/null +++ b/opl/dbopl.h @@ -0,0 +1,203 @@ +/* + * 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. + * + * 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 <inttypes.h> + +//Use 8 handlers based on a small logatirmic wavetabe and an exponential table for volume +#define WAVE_HANDLER 10 +//Use a logarithmic wavetable with an exponential table for volume +#define WAVE_TABLELOG 11 +//Use a linear wavetable with a multiply table for volume +#define WAVE_TABLEMUL 12 + +//Select the type of wave generator routine +#define DBOPL_WAVE WAVE_TABLEMUL + +typedef struct _Chip Chip; +typedef struct _Operator Operator; +typedef struct _Channel Channel; + +typedef uintptr_t Bitu; +typedef intptr_t Bits; +typedef uint32_t Bit32u; +typedef int32_t Bit32s; +typedef uint16_t Bit16u; +typedef int16_t Bit16s; +typedef uint8_t Bit8u; +typedef int8_t Bit8s; + +#if (DBOPL_WAVE == WAVE_HANDLER) +typedef Bits ( DB_FASTCALL *WaveHandler) ( Bitu i, Bitu volume ); +#endif + +#define DB_FASTCALL + +typedef Bits (*VolumeHandler)(Operator *self); +typedef Channel* (*SynthHandler)(Channel *self, Chip* chip, Bit32u samples, Bit32s* output ); + +//Different synth modes that can generate blocks of data +typedef enum { + sm2AM, + sm2FM, + sm3AM, + sm3FM, + sm4Start, + sm3FMFM, + sm3AMFM, + sm3FMAM, + sm3AMAM, + sm6Start, + sm2Percussion, + sm3Percussion, +} SynthMode; + +//Shifts for the values contained in chandata variable +enum { + SHIFT_KSLBASE = 16, + SHIFT_KEYCODE = 24, +}; + +//Masks for operator 20 values +enum { + MASK_KSR = 0x10, + MASK_SUSTAIN = 0x20, + MASK_VIBRATO = 0x40, + MASK_TREMOLO = 0x80, +}; + +typedef enum { + OFF, + RELEASE, + SUSTAIN, + DECAY, + ATTACK, +} OperatorState; + +struct _Operator { + VolumeHandler volHandler; + +#if (DBOPL_WAVE == WAVE_HANDLER) + WaveHandler waveHandler; //Routine that generate a wave +#else + Bit16s* waveBase; + Bit32u waveMask; + Bit32u waveStart; +#endif + Bit32u waveIndex; //WAVE_BITS shifted counter of the frequency index + Bit32u waveAdd; //The base frequency without vibrato + Bit32u waveCurrent; //waveAdd + vibratao + + Bit32u chanData; //Frequency/octave and derived data coming from whatever channel controls this + Bit32u freqMul; //Scale channel frequency with this, TODO maybe remove? + Bit32u vibrato; //Scaled up vibrato strength + Bit32s sustainLevel; //When stopping at sustain level stop here + Bit32s totalLevel; //totalLevel is added to every generated volume + Bit32u currentLevel; //totalLevel + tremolo + Bit32s volume; //The currently active volume + + Bit32u attackAdd; //Timers for the different states of the envelope + Bit32u decayAdd; + Bit32u releaseAdd; + Bit32u rateIndex; //Current position of the evenlope + + Bit8u rateZero; //Bits for the different states of the envelope having no changes + Bit8u keyOn; //Bitmask of different values that can generate keyon + //Registers, also used to check for changes + Bit8u reg20, reg40, reg60, reg80, regE0; + //Active part of the envelope we're in + Bit8u state; + //0xff when tremolo is enabled + Bit8u tremoloMask; + //Strength of the vibrato + Bit8u vibStrength; + //Keep track of the calculated KSR so we can check for changes + Bit8u ksr; +}; + +struct _Channel { + Operator op[2]; + SynthHandler synthHandler; + Bit32u chanData; //Frequency/octave and derived values + Bit32s old[2]; //Old data for feedback + + Bit8u feedback; //Feedback shift + Bit8u regB0; //Register values to check for changes + Bit8u regC0; + //This should correspond with reg104, bit 6 indicates a Percussion channel, bit 7 indicates a silent channel + Bit8u fourMask; + Bit8s maskLeft; //Sign extended values for both channel's panning + Bit8s maskRight; + +}; + +struct _Chip { + //This is used as the base counter for vibrato and tremolo + Bit32u lfoCounter; + Bit32u lfoAdd; + + + Bit32u noiseCounter; + Bit32u noiseAdd; + Bit32u noiseValue; + + //Frequency scales for the different multiplications + Bit32u freqMul[16]; + //Rates for decay and release for rate of this chip + Bit32u linearRates[76]; + //Best match attack rates for the rate of this chip + Bit32u attackRates[76]; + + //18 channels with 2 operators each + Channel chan[18]; + + Bit8u reg104; + Bit8u reg08; + Bit8u reg04; + Bit8u regBD; + Bit8u vibratoIndex; + Bit8u tremoloIndex; + Bit8s vibratoSign; + Bit8u vibratoShift; + Bit8u tremoloValue; + Bit8u vibratoStrength; + Bit8u tremoloStrength; + //Mask for allowed wave forms + Bit8u waveFormMask; + //0 or -1 when enabled + Bit8s opl3Active; + +}; + +/* +struct Handler : public Adlib::Handler { + DBOPL::Chip chip; + virtual Bit32u WriteAddr( Bit32u port, Bit8u val ); + virtual void WriteReg( Bit32u addr, Bit8u val ); + virtual void Generate( MixerChannel* chan, Bitu samples ); + virtual void Init( Bitu rate ); +}; +*/ + + +void Chip__Setup(Chip *self, Bit32u rate ); +void DBOPL_InitTables( void ); +void Chip__Chip(Chip *self); +void Chip__WriteReg(Chip *self, Bit32u reg, Bit8u val ); +void Chip__GenerateBlock2(Chip *self, Bitu total, Bit32s* output ); + + |