193 lines
5.8 KiB
C
193 lines
5.8 KiB
C
/*
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header file for software emulation for FM sound generator
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*/
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#ifndef _H_FM_FM_
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#define _H_FM_FM_
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/* compiler dependence */
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#ifndef UINT8
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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 int UINT32; /* unsigned 32bit */
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#endif
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#ifndef INT8
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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 int INT32; /* signed 32bit */
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#endif
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#if 1
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/* struct describing a single operator (SLOT) */
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typedef struct
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{
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INT32 *DT; /* #0x00 detune :dt_tab[DT] */
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UINT8 ar; /* #0x04 attack rate */
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UINT8 d1r; /* #0x05 decay rate */
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UINT8 d2r; /* #0x06 sustain rate */
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UINT8 rr; /* #0x07 release rate */
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UINT32 mul; /* #0x08 multiple :ML_TABLE[ML] */
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/* Phase Generator */
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UINT32 phase; /* #0x0c phase counter | need_save */
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UINT32 Incr; /* #0x10 phase step */
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UINT8 KSR; /* #0x14 key scale rate :3-KSR */
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UINT8 ksr; /* #0x15 key scale rate :kcode>>(3-KSR) */
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UINT8 key; /* #0x16 0=last key was KEY OFF, 1=KEY ON */
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/* Envelope Generator */
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UINT8 state; /* #0x17 phase type: EG_OFF=0, EG_REL, EG_SUS, EG_DEC, EG_ATT | need_save */
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UINT16 tl; /* #0x18 total level: TL << 3 */
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INT16 volume; /* #0x1a envelope counter | need_save */
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UINT32 sl; /* #0x1c sustain level:sl_table[SL] */
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UINT32 eg_pack_ar; /* #0x20 (attack state) */
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UINT32 eg_pack_d1r; /* #0x24 (decay state) */
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UINT32 eg_pack_d2r; /* #0x28 (sustain state) */
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UINT32 eg_pack_rr; /* #0x2c (release state) */
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} FM_SLOT;
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typedef struct
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{
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FM_SLOT SLOT[4]; /* four SLOTs (operators) */
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UINT8 ALGO; /* +00 algorithm */
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UINT8 FB; /* feedback shift */
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UINT8 pad[2];
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INT32 op1_out; /* op1 output for feedback */
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INT32 mem_value; /* +08 delayed sample (MEM) value */
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INT32 pms; /* channel PMS */
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UINT8 ams; /* channel AMS */
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UINT8 kcode; /* +11 key code: */
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UINT8 fn_h; /* freq latch */
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UINT8 pad2;
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UINT32 fc; /* fnum,blk:adjusted to sample rate */
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UINT32 block_fnum; /* current blk/fnum value for this slot (can be different betweeen slots of one channel in 3slot mode) */
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/* LFO */
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UINT8 AMmasks; /* AM enable flag */
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UINT8 pad3[3];
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} FM_CH;
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typedef struct
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{
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int clock; /* master clock (Hz) */
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int rate; /* sampling rate (Hz) */
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double freqbase; /* 08 frequency base */
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UINT8 address; /* 10 address register | need_save */
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UINT8 status; /* 11 status flag | need_save */
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UINT8 mode; /* mode CSM / 3SLOT */
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UINT8 pad;
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int TA; /* timer a */
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int TAC; /* timer a maxval */
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int TAT; /* timer a ticker | need_save */
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UINT8 TB; /* timer b */
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UINT8 pad2[3];
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int TBC; /* timer b maxval */
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int TBT; /* timer b ticker | need_save */
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/* local time tables */
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INT32 dt_tab[8][32];/* DeTune table */
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} FM_ST;
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/***********************************************************/
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/* OPN unit */
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/***********************************************************/
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/* OPN 3slot struct */
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typedef struct
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{
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UINT32 fc[3]; /* fnum3,blk3: calculated */
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UINT8 fn_h; /* freq3 latch */
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UINT8 kcode[3]; /* key code */
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UINT32 block_fnum[3]; /* current fnum value for this slot (can be different betweeen slots of one channel in 3slot mode) */
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} FM_3SLOT;
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/* OPN/A/B common state */
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typedef struct
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{
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FM_ST ST; /* general state */
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FM_3SLOT SL3; /* 3 slot mode state */
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UINT32 pan; /* fm channels output mask (bit 1 = enable) */
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UINT32 eg_cnt; /* global envelope generator counter | need_save */
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UINT32 eg_timer; /* global envelope generator counter works at frequency = chipclock/64/3 | need_save */
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UINT32 eg_timer_add; /* step of eg_timer */
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/* LFO */
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UINT32 lfo_cnt; /* need_save */
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UINT32 lfo_inc;
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UINT32 lfo_freq[8]; /* LFO FREQ table */
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} FM_OPN;
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/* here's the virtual YM2612 */
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typedef struct
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{
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UINT8 REGS[0x200]; /* registers (for save states) */
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INT32 addr_A1; /* address line A1 | need_save */
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FM_CH CH[6]; /* channel state */
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/* dac output (YM2612) */
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int dacen;
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INT32 dacout;
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FM_OPN OPN; /* OPN state */
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UINT32 slot_mask; /* active slot mask (performance hack) */
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} YM2612;
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#endif
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#ifndef EXTERNAL_YM2612
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extern YM2612 ym2612;
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#endif
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void YM2612Init_(int baseclock, int rate);
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void YM2612ResetChip_(void);
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int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty);
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int YM2612Write_(unsigned int a, unsigned int v);
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//unsigned char YM2612Read_(void);
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int YM2612PicoTick_(int n);
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void YM2612PicoStateLoad_(void);
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void *YM2612GetRegs(void);
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void YM2612PicoStateSave2(int tat, int tbt);
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int YM2612PicoStateLoad2(int *tat, int *tbt);
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#ifndef __GP2X__
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#define YM2612Init YM2612Init_
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#define YM2612ResetChip YM2612ResetChip_
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#define YM2612UpdateOne YM2612UpdateOne_
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#define YM2612PicoStateLoad YM2612PicoStateLoad_
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#else
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/* GP2X specific */
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#include "../../platform/gp2x/940ctl.h"
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extern int PicoOpt;
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#define YM2612Init(baseclock,rate) { \
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if (PicoOpt&0x200) YM2612Init_940(baseclock, rate); \
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else YM2612Init_(baseclock, rate); \
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}
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#define YM2612ResetChip() { \
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if (PicoOpt&0x200) YM2612ResetChip_940(); \
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else YM2612ResetChip_(); \
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}
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#define YM2612UpdateOne(buffer,length,stereo,is_buf_empty) \
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(PicoOpt&0x200) ? YM2612UpdateOne_940(buffer, length, stereo, is_buf_empty) : \
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YM2612UpdateOne_(buffer, length, stereo, is_buf_empty);
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#define YM2612PicoStateLoad() { \
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if (PicoOpt&0x200) YM2612PicoStateLoad_940(); \
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else YM2612PicoStateLoad_(); \
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}
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#endif /* __GP2X__ */
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#endif /* _H_FM_FM_ */
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