Converted Dosbox fast FM emulator to C and imported it for inclusion in st3play
Chris Moeller
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9a87f61e77
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/*
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* Copyright (C) 2002-2009 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef _MSC_VER
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#define INLINE __forceinline
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#define DB_FASTCALL __fastcall
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#else
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#define INLINE inline
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#define DB_FASTCALL __attribute__((fastcall))
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#endif
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typedef double Real64;
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/* The internal types */
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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typedef uint8_t Bit8u;
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typedef int8_t Bit8s;
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typedef uint16_t Bit16u;
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typedef int16_t Bit16s;
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typedef uint32_t Bit32u;
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typedef int32_t Bit32s;
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typedef uint64_t Bit64u;
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typedef int64_t Bit64s;
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#else
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typedef unsigned char Bit8u;
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typedef signed char Bit8s;
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typedef unsigned short Bit16u;
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typedef signed short Bit16s;
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typedef unsigned long Bit32u;
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typedef signed long Bit32s;
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#ifdef _MSC_VER
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typedef unsigned __int64 Bit64u;
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typedef signed __int64 Bit64s;
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#else
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typedef unsigned long long Bit64u;
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typedef signed long long Bit64s;
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#endif
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#endif
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typedef unsigned int Bitu;
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typedef signed int Bits;
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//#include "dosbox.h"
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//Use 8 handlers based on a small logatirmic wavetabe and an exponential table for volume
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#define WAVE_HANDLER 10
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//Use a logarithmic wavetable with an exponential table for volume
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#define WAVE_TABLELOG 11
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//Use a linear wavetable with a multiply table for volume
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#define WAVE_TABLEMUL 12
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//Select the type of wave generator routine
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#define DBOPL_WAVE WAVE_TABLEMUL
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#if (DBOPL_WAVE == WAVE_HANDLER)
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typedef Bits ( DB_FASTCALL *WaveHandler) ( Bitu i, Bitu volume );
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#endif
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typedef Bits ( *Operator_VolumeHandler) ( struct Operator * );
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typedef struct Channel* ( *Channel_SynthHandler) ( struct Channel *, struct Chip* chip, Bit32u samples, Bit32s* output );
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//Different synth modes that can generate blocks of data
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typedef enum {
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sm2AM,
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sm2FM,
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sm3AM,
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sm3FM,
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sm4Start,
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sm3FMFM,
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sm3AMFM,
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sm3FMAM,
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sm3AMAM,
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sm6Start,
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sm2Percussion,
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sm3Percussion
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} SynthMode;
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//Shifts for the values contained in chandata variable
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enum {
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SHIFT_KSLBASE = 16,
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SHIFT_KEYCODE = 24
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};
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enum {
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MASK_KSR = 0x10,
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MASK_SUSTAIN = 0x20,
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MASK_VIBRATO = 0x40,
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MASK_TREMOLO = 0x80
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};
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typedef enum {
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OFF,
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RELEASE,
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SUSTAIN,
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DECAY,
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ATTACK
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} Operator_State;
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struct Operator {
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//Masks for operator 20 values
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Operator_VolumeHandler volHandler;
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#if (DBOPL_WAVE == WAVE_HANDLER)
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WaveHandler waveHandler; //Routine that generate a wave
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#else
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Bit16s* waveBase;
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Bit32u waveMask;
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Bit32u waveStart;
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#endif
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Bit32u waveIndex; //WAVE_BITS shifted counter of the frequency index
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Bit32u waveAdd; //The base frequency without vibrato
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Bit32u waveCurrent; //waveAdd + vibratao
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Bit32u chanData; //Frequency/octave and derived data coming from whatever channel controls this
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Bit32u freqMul; //Scale channel frequency with this, TODO maybe remove?
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Bit32u vibrato; //Scaled up vibrato strength
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Bit32s sustainLevel; //When stopping at sustain level stop here
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Bit32s totalLevel; //totalLevel is added to every generated volume
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Bit32u currentLevel; //totalLevel + tremolo
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Bit32s volume; //The currently active volume
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Bit32u attackAdd; //Timers for the different states of the envelope
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Bit32u decayAdd;
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Bit32u releaseAdd;
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Bit32u rateIndex; //Current position of the evenlope
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Bit8u rateZero; //Bits for the different states of the envelope having no changes
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Bit8u keyOn; //Bitmask of different values that can generate keyon
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//Registers, also used to check for changes
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Bit8u reg20, reg40, reg60, reg80, regE0;
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//Active part of the envelope we're in
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Bit8u state;
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//0xff when tremolo is enabled
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Bit8u tremoloMask;
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//Strength of the vibrato
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Bit8u vibStrength;
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//Keep track of the calculated KSR so we can check for changes
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Bit8u ksr;
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};
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struct Channel {
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struct Operator op[2];
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Channel_SynthHandler synthHandler;
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Bit32u chanData; //Frequency/octave and derived values
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Bit32s old[2]; //Old data for feedback
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Bit8u feedback; //Feedback shift
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Bit8u regB0; //Register values to check for changes
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Bit8u regC0;
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//This should correspond with reg104, bit 6 indicates a Percussion channel, bit 7 indicates a silent channel
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Bit8u fourMask;
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Bit8s maskLeft; //Sign extended values for both channel's panning
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Bit8s maskRight;
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};
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struct Chip {
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//This is used as the base counter for vibrato and tremolo
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Bit32u lfoCounter;
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Bit32u lfoAdd;
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Bit32u noiseCounter;
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Bit32u noiseAdd;
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Bit32u noiseValue;
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//Frequency scales for the different multiplications
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Bit32u freqMul[16];
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//Rates for decay and release for rate of this chip
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Bit32u linearRates[76];
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//Best match attack rates for the rate of this chip
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Bit32u attackRates[76];
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//18 channels with 2 operators each
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struct Channel chan[18];
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Bit8u reg104;
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Bit8u reg08;
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Bit8u reg04;
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Bit8u regBD;
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Bit8u vibratoIndex;
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Bit8u tremoloIndex;
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Bit8s vibratoSign;
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Bit8u vibratoShift;
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Bit8u tremoloValue;
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Bit8u vibratoStrength;
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Bit8u tremoloStrength;
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//Mask for allowed wave forms
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Bit8u waveFormMask;
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//0 or -1 when enabled
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Bit8s opl3Active;
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};
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void Chip_Init(struct Chip *chip);
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void Chip_Setup( struct Chip *chip, Bit32u clock, Bit32u rate );
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void Chip_WriteReg( struct Chip *chip, Bit32u reg, Bit8u val );
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Bit32u Chip_WriteAddr( struct Chip *chip, Bit32u port, Bit8u val );
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void Chip_GenerateBlock2( struct Chip *chip, Bitu total, Bit32s* output );
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void Chip_GenerateBlock3( struct Chip *chip, Bitu total, Bit32s* output );
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