mirror of
https://github.com/id-Software/Wolf3D-iOS.git
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135 lines
4.3 KiB
C
135 lines
4.3 KiB
C
/* tab setting : 4
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*
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* FM OPL2 synth
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*
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* Copyright (C) 1999,2000 Tatsuyuki Satoh , MultiArcadeMachineEmulator development
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* Modified for Wolfenstein 3D by Steven Fuller
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* Future Modifications by DarkOne for WolfGL! (wolfgl.narod.ru)
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*/
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#ifndef __FMOPL_H_
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#define __FMOPL_H_
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// Register addresses
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// Operator stuff
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#define alChar 0x20
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#define alScale 0x40
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#define alAttack 0x60
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#define alSus 0x80
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#define alWave 0xe0
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// Channel stuff
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#define alFreqL 0xa0
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#define alFreqH 0xb0
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#define alFeedCon 0xc0
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// Global stuff
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#define alEffects 0xbd
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#define OPL_OUTPUT_BIT 16
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typedef unsigned char UINT8; /* unsigned 8bit */
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typedef unsigned short UINT16; /* unsigned 16bit */
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typedef unsigned long UINT32; /* unsigned 32bit */
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typedef signed char INT8; /* signed 8bit */
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typedef signed short INT16; /* signed 16bit */
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typedef signed long INT32; /* signed 32bit */
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#if (OPL_OUTPUT_BIT==16)
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typedef INT16 OPLSAMPLE;
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#endif
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#if (OPL_OUTPUT_BIT==8)
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typedef unsigned char OPLSAMPLE;
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#endif
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/* ---------- OPL one of slot ---------- */
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typedef struct fm_opl_slot
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{
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INT32 TL; /* total level :TL << 8 */
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INT32 TLL; /* adjusted now TL */
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UINT8 KSR; /* key scale rate :(shift down bit) */
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INT32 *AR; /* attack rate :&AR_TABLE[AR<<2] */
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INT32 *DR; /* decay rate :&DR_TALBE[DR<<2] */
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INT32 SL; /* sustin level :SL_TALBE[SL] */
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INT32 *RR; /* release rate :&DR_TABLE[RR<<2] */
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UINT8 ksl; /* keyscale level :(shift down bits) */
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UINT8 ksr; /* key scale rate :kcode>>KSR */
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UINT32 mul; /* multiple :ML_TABLE[ML] */
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UINT32 Cnt; /* frequency count : */
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UINT32 Incr; /* frequency step : */
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/* envelope generator state */
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UINT8 eg_typ; /* envelope type flag */
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UINT8 evm; /* envelope phase */
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INT32 evc; /* envelope counter */
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INT32 eve; /* envelope counter end point */
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INT32 evs; /* envelope counter step */
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INT32 evsa; /* envelope step for AR :AR[ksr] */
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INT32 evsd; /* envelope step for DR :DR[ksr] */
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INT32 evsr; /* envelope step for RR :RR[ksr] */
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/* LFO */
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UINT8 ams; /* ams flag */
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UINT8 vib; /* vibrate flag */
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/* wave selector */
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INT32 **wavetable;
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} OPL_SLOT;
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/* ---------- OPL one of channel ---------- */
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typedef struct fm_opl_channel
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{
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OPL_SLOT SLOT[2];
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UINT8 CON; /* connection type */
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UINT8 FB; /* feed back :(shift down bit) */
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INT32 *connect1; /* slot1 output pointer */
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INT32 *connect2; /* slot2 output pointer */
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INT32 op1_out[2]; /* slot1 output for selfeedback */
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/* phase generator state */
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UINT32 block_fnum; /* block+fnum : */
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UINT8 kcode; /* key code : KeyScaleCode */
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UINT32 fc; /* Freq. Increment base */
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UINT32 ksl_base; /* KeyScaleLevel Base step */
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UINT8 keyon; /* key on/off flag */
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} OPL_CH;
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/* OPL state */
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typedef struct fm_opl_f {
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UINT8 type; /* chip type */
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int clock; /* master clock (Hz) */
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int rate; /* sampling rate (Hz) */
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double freqbase; /* frequency base */
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UINT8 address; /* address register */
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UINT32 mode; /* Reg.08 : CSM , notesel,etc. */
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/* FM channel slots */
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OPL_CH *P_CH; /* pointer of CH */
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int max_ch; /* maximum channel */
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/* Rythm sention */
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UINT8 rythm; /* Rythm mode , key flag */
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INT32 AR_TABLE[75]; /* attack rate tables */
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INT32 DR_TABLE[75]; /* decay rate tables */
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UINT32 FN_TABLE[1024]; /* fnumber -> increment counter */
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/* LFO */
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INT32 *ams_table;
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INT32 *vib_table;
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INT32 amsCnt;
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INT32 amsIncr;
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INT32 vibCnt;
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INT32 vibIncr;
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/* wave selector enable flag */
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UINT8 wavesel;
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} FM_OPL;
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/* ---------- Generic interface section ---------- */
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#define OPL_TYPE_YM3812 0
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FM_OPL *OPLCreate(int type, int clock, int rate);
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void OPLDestroy(FM_OPL *OPL);
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void OPLResetChip(FM_OPL *OPL);
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void OPLWrite(FM_OPL *OPL,int a,int v);
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unsigned char OPLRead(FM_OPL *OPL,int a);
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void YM3812UpdateOne(FM_OPL *OPL, void *buffer, int length);
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#endif /* __FMPOL_H */
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/* end of file */
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