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#define	OPM_CLOCK		4000000L			// X1 & X68000 OPM 4MHz
#define	OPMCH_MAX		8

enum {
	FMDIV_BITS		= 9,
	FMDIV_ENT		= (1 << FMDIV_BITS),
	FMVOL_SFTBIT	= 5
};

#if !defined(_WIN32_WCE)
#define	SIN_BITS		10
#define	EVC_BITS		10
#else
#define	SIN_BITS		8
#define	EVC_BITS		7
#endif
#define	ENV_BITS		16
#define	KF_BITS			6
#define	FREQ_BITS		20
#define	ENVTBL_BIT		14
#define	SINTBL_BIT		14

#define	TL_BITS			(FREQ_BITS + 2)
#define	OPM_OUTSB		(TL_BITS + 2 - 16)			// OPM output 16bit

#define	SIN_ENT			(1 << SIN_BITS)
#define	EVC_ENT			(1 << EVC_BITS)

#define	EC_ATTACK		0								// ATTACK start
#define	EC_DECAY		(EVC_ENT << ENV_BITS)			// DECAY start
#define	EC_OFF			((2 * EVC_ENT) << ENV_BITS)		// OFF

#define	TL_MAX			(EVC_ENT * 2)

enum {
	OPMSLOT1		= 0,
	OPMSLOT2		= 2,
	OPMSLOT3		= 1,
	OPMSLOT4		= 3,

	EM_ATTACK		= 4,
	EM_DECAY1		= 3,
	EM_DECAY2		= 2,
	EM_RELEASE		= 1,
	EM_OFF			= 0
};

typedef struct {
	SINT32		*detune1;			// detune1
	SINT32		detune2;			// detune2
	SINT32		totallevel;			// total level
	SINT32		decaylevel;			// decay level
const SINT32	*attack;			// attack ratio
const SINT32	*decay1;			// decay1 ratio
const SINT32	*decay2;			// decay2 ratio
const SINT32	*release;			// release ratio
	SINT32		freq_cnt;			// frequency count
	SINT32		freq_inc;			// frequency step
	UINT8		keyscale;			// key scale
	UINT8		multiple;			// multiple
	UINT8		env_mode;			// envelope mode
	UINT8		envratio;			// envelope raito

	SINT32		env_cnt;			// envelope count
	SINT32		env_end;			// envelope end count
	SINT32		env_inc;			// envelope step
	SINT32		env_inc_attack;		// envelope attack step
	SINT32		env_inc_decay1;		// envelope decay1 step
	SINT32		env_inc_decay2;		// envelope decay2 step
	SINT32		env_inc_release;	// envelope release step
} OPMSLOT;


typedef struct {
	OPMSLOT	slot[4];
	UINT8	algorithm;			// algorythm
	UINT8	feedback;			// self feedback
	UINT8	playing;
	UINT8	outslot;
	SINT32	op1fb;				// operator1 feedback
	SINT32	*connect1;			// operator1 connect
	SINT32	*connect3;			// operator3 connect
	SINT32	*connect2;			// operator2 connect
	SINT32	*connect4;			// operator4 connect
	UINT32	keynote;			// key note

	UINT8	keyfunc;			// key function
	UINT8	kcode;				// key code
	UINT8	pan;				// pan
	UINT8	padding;
} OPMCH;

typedef struct {
	UINT	playing;
	UINT8	mode;
	UINT8	padding[3];
	SINT32	feedback2;
	SINT32	feedback3;
	SINT32	feedback4;
	SINT32	outdl;
	SINT32	outdc;
	SINT32	outdr;
	SINT32	calcremain;
	UINT8	keyreg[OPMCH_MAX];
} _OPMGEN, *OPMGEN;

typedef struct {
	SINT32	calc1024;
	SINT32	fmvol;

	SINT32	sintable[SIN_ENT];
	SINT32	envtable[EVC_ENT];
	SINT32	envcurve[(EVC_ENT * 2) + 1];
} OPMCFG;


#ifdef __cplusplus
extern "C" {
#endif

void opmgen_initialize(UINT rate);
void opmgen_setvol(UINT vol);
void opmgen_reset(void);
void opmgen_setreg(REG8 reg, REG8 value);

void SOUNDCALL opmgen_getpcm(void *hdl, SINT32 *pcm, UINT count);

#ifdef __cplusplus
}
#endif