/***************************************************************************

 *

 * softmixa.h

 *

 ***************************************************************************

 *

 * assembly functions/variables for software mixing

 *

 ***************************************************************************/



#ifndef SOFTMIXA_H_INCLUDED

#define SOFTMIXA_H_INCLUDED



/*

 * includes

 */



/*

 * defines

 */



#define FORMAT_PCM16    0

#define FORMAT_BENLAW   1

#define FORMAT_N64ADPCM 6





/*

 * typedefs

 */



/*

 * structures

 */



struct softChannel

	{

	unsigned char *ptr;

	unsigned long status;

	unsigned long offsetHi;

	unsigned long offsetLo;

	unsigned long incHi;

	unsigned long incLo;

	unsigned long endPt;

	unsigned long lpStart;

	unsigned char vol;

	unsigned char pan;

	unsigned char voll;

	unsigned char volr;

	unsigned long lpEnd;

	unsigned long sample;

	unsigned long format;

	};



/*

 * globals

 */



extern	struct softChannel *asmMixChannelPtr;

extern	unsigned long       asmMixNumChannels;

extern	unsigned long       asmMixSampleCount;

extern	unsigned long *     asmMixWritePtr;

extern	unsigned char *     asmMixFinalWritePtr;

extern	unsigned char *     asmMixVolTablePtr;

extern	unsigned long       asmMixAddValue;

extern	unsigned char       asmMixShiftValue;

extern	unsigned char       asmMixStoreFirst;

extern	signed long         asmMixMinValue;

extern	signed long         asmMixMaxValue;



/*

 * function prototypes

 */



extern	void                AsmMixMono          (void);

extern	void                AsmMixStereo        (void);



extern	void                AsmMixDown8         (void);

extern	void                AsmMixDown16        (void);



extern	void                SoundModuleStart    (void);

extern	void                SoundModuleEnd      (void);



extern	void                PcmMono             (void);

extern	void                PcmStereo           (void);



extern	void                BenLawMono          (void);

extern	void                BenLawStereo        (void);



#endif