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Merge pull request #86 from jpcima/pmdwin
add PMDWin emulator
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| #ifndef FM_OP_H | ||
| #define FM_OP_H | ||
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| #include <stdint.h> | ||
| #define false 0 | ||
| #define true 1 | ||
| #define Max(a,b) ((a>b)?a:b) | ||
| #define Min(a,b) ((a<b)?a:b) | ||
|
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| /* Types ---------------------------------------------------------------- */ | ||
| typedef int32_t Sample; | ||
| typedef int32_t ISample; | ||
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| /* --------------------------------------------------------------------------- | ||
| // Various implementation-specific constants. | ||
| // Most are used to either define the bit-width of counters, or the size | ||
| // of various constant tables. | ||
| */ | ||
| #define FM_LFOBITS 8 | ||
| #define FM_LFOENTS (1 << FM_LFOBITS) | ||
| #define FM_OPSINBITS 10 | ||
| #define FM_OPSINENTS (1 << FM_OPSINBITS) | ||
| #define FM_EGBITS 16 | ||
| #define FM_EGCBITS 18 | ||
| #define FM_LFOCBITS 14 | ||
| #define FM_PGBITS 9 | ||
| #define FM_RATIOBITS 12 | ||
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| typedef enum _EGPhase { next, attack, decay, sustain, release, off } EGPhase; | ||
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| static inline int Limit(int v, int max, int min) | ||
| { | ||
| return v > max ? max : (v < min ? min : v); | ||
| } | ||
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| static inline int16_t Limit16(int a) | ||
| { | ||
| if ((a+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF; | ||
| else return a; | ||
| } | ||
|
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| /* ------------------------------------------------------------------------- */ | ||
| struct _OPNA; | ||
| struct Channel4; | ||
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| /* Operator ---------------------------------------------------------------- */ | ||
| typedef struct _FMOperator | ||
| { | ||
| struct Channel4 *master; | ||
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| int32_t out, out2; | ||
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| /* Phase Generator ----------------------------------------------------- */ | ||
| uint32_t dp; /* Octave (used to define note in conjunction with bn, below). */ | ||
| uint8_t detune; /* Detune */ | ||
| uint8_t multiple; /* Multiple */ | ||
| uint32_t pgcount; /* Phase generator sweep value. Only the top 9 bits are relevant/used. */ | ||
| uint32_t pgdcount; /* Phase generator increment-per-clock value. Hopefully self-explanatory. */ | ||
| uint32_t pgdcountl; /* Phase generator detune increment value. Used in the implementation of vibrato. */ | ||
| /* Equal to pgdcount >> 11. */ | ||
|
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| /* Envelope Generator -------------------------------------------------- */ | ||
| uint32_t bn; /* Block/Note */ | ||
| uint32_t egout; | ||
| int eglevel; /* EG ¤Î½ÐÎÏÃÍ */ | ||
| int eglvnext; /* ¼¡¤Î phase ¤Ë°Ü¤ëÃÍ */ | ||
| int32_t egstep; /* EG ¤Î¼¡¤ÎÊѰܤޤǤλþ´Ö */ | ||
| int32_t egstepd; /* egstep ¤Î»þ´Öº¹Ê¬ */ | ||
| uint8_t egtransa; /* EG ÊѲ½¤Î³ä¹ç (for attack) */ | ||
| uint8_t egtransd; /* EG ÊѲ½¤Î³ä¹ç (for decay) */ | ||
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| uint32_t ksr; /* key scale rate */ | ||
| EGPhase phase; | ||
| uint8_t ams; | ||
| uint8_t ms; | ||
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| uint8_t keyon; /* current key state */ | ||
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| uint8_t tl; /* Total Level (0-127) */ | ||
| uint8_t tll; /* Total Level Latch (for CSM mode) */ | ||
| uint8_t ar; /* Attack Rate (0-63) */ | ||
| uint8_t dr; /* Decay Rate (0-63) */ | ||
| uint8_t sr; /* Sustain Rate (0-63) */ | ||
| uint8_t sl; /* Sustain Level (0-127) */ | ||
| uint8_t rr; /* Release Rate (0-63) */ | ||
| uint8_t ks; /* Keyscale (0-3) */ | ||
| uint8_t ssgtype; /* SSG-Type Envelope Control */ | ||
|
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| uint8_t amon; /* enable Amplitude Modulation */ | ||
| uint8_t paramchanged; /* Set whenever f-number or any ADSR constants */ | ||
| /* are set in OPNASetReg(), as well as upon */ | ||
| /* chip reset and chip "DAC" samplerate change. */ | ||
| /* Causes the envelope generator to reset its */ | ||
| /* internal state, also sets correct increments */ | ||
| /* for the phase generator. */ | ||
| uint8_t mute; | ||
| } FMOperator; | ||
|
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| /* 4-op Channel ------------------------------------------------------------ */ | ||
| typedef struct Channel4 | ||
| { | ||
| struct _OPNA *master; | ||
| uint32_t fb; | ||
| int buf[4]; | ||
| uint8_t idx[6]; | ||
| int *pms; | ||
| uint16_t panl; | ||
| uint16_t panr; | ||
| FMOperator op[4]; | ||
| } Channel4; | ||
|
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| /* OPNA Rhythm Generator --------------------------------------------------- */ | ||
| typedef struct Rhythm { | ||
| uint8_t pan; | ||
| int8_t level; | ||
| int8_t volume; | ||
| int8_t* sample; /* Rhythm sample data */ | ||
| uint32_t size; /* Rhythm sample data size */ | ||
| uint32_t pos; /* Current index into rhytm sample data array */ | ||
| uint32_t step; /* Amount to increment the above by every time */ | ||
| /* RhythmMix() gets called. */ | ||
| uint32_t rate; /* Samplerate of rhythm sample data */ | ||
| /* (44100Hz in this implementation). */ | ||
| } Rhythm; | ||
|
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
|
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| /* -------------------------------------------------------------------------- | ||
| // Miscellaneous and probably irrelevant function prototypes. */ | ||
| void OperatorInit(Channel4 *ch4, FMOperator *op); | ||
| void OperatorReset(FMOperator *op); | ||
| void OperatorPrepare(FMOperator *op); | ||
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| static inline uint32_t IsOn(FMOperator *op) { | ||
| return (op->phase - off); | ||
| } | ||
|
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
|
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| #endif |
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