src/hardware/snd_pc98/sound/psggen.h

enum {
        PSGFREQPADBIT           = 12,
        PSGADDEDBIT                     = 3
};

enum {
        PSGENV_INC                      = 15,
        PSGENV_ONESHOT          = 16,
        PSGENV_LASTON           = 32,
        PSGENV_ONECYCLE         = 64
};

typedef struct {
        SINT32  freq;
        SINT32  count;
        SINT32  *pvol;                  // !!
        UINT16  puchi;
        UINT8   pan;
        UINT8   padding;
} PSGTONE;

typedef struct {
        SINT32  freq;
        SINT32  count;
        UINT    base;
} PSGNOISE;

typedef struct {
        UINT8   tune[3][2];             // 0
        UINT8   noise;                  // 6
        UINT8   mixer;                  // 7
        UINT8   vol[3];                 // 8
        UINT8   envtime[2];             // b
        UINT8   env;                    // d
        UINT8   io1;
        UINT8   io2;
} PSGREG;

typedef struct {
        PSGTONE         tone[3];
        PSGNOISE        noise;
        PSGREG          reg;
        UINT16          envcnt;
        UINT16          envmax;
        UINT8           mixer;
        UINT8           envmode;
        UINT8           envvol;
        SINT8           envvolcnt;
        SINT32          evol;                           // !!
        UINT            puchicount;
} _PSGGEN, *PSGGEN;

typedef struct {
        SINT32  volume[16];
        SINT32  voltbl[16];
        UINT    rate;
        UINT32  base;
        UINT16  puchidec;
} PSGGENCFG;


#ifdef __cplusplus
extern "C" {
#endif

void psggen_initialize(UINT rate);
void psggen_setvol(UINT vol);

void psggen_reset(PSGGEN psg);
void psggen_restore(PSGGEN psg);
void psggen_setreg(PSGGEN psg, UINT reg, REG8 val);
REG8 psggen_getreg(PSGGEN psg, UINT reg);
void psggen_setpan(PSGGEN psg, UINT ch, REG8 pan);

void SOUNDCALL psggen_getpcm(PSGGEN psg, SINT32 *pcm, UINT count);

#ifdef __cplusplus
}
#endif