AppleWin/source/AY8910.h

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C
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#ifndef AY8910_H
#define AY8910_H
#define MAX_8910 4
//-------------------------------------
// MAME interface
void _AYWriteReg(int chip, int r, int v);
//void AY8910_write_ym(int chip, int addr, int data);
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void AY8910_reset(int chip);
void AY8910Update(int chip, INT16** buffer, int nNumSamples);
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void AY8910_InitAll(int nClock, int nSampleRate);
void AY8910_InitClock(int nClock);
BYTE* AY8910_GetRegsPtr(UINT uChip);
void AY8910UpdateSetCycles();
//-------------------------------------
// FUSE stuff
typedef ULONG libspectrum_dword;
typedef UCHAR libspectrum_byte;
typedef SHORT libspectrum_signed_word;
/* max. number of sub-frame AY port writes allowed;
* given the number of port writes theoretically possible in a
* 50th I think this should be plenty.
*/
#define AY_CHANGE_MAX 8000
class CAY8910
{
public:
CAY8910();
virtual ~CAY8910() {};
void sound_ay_init( void );
void sound_init( const char *device );
void sound_ay_write( int reg, int val, libspectrum_dword now );
void sound_ay_reset( void );
void sound_frame( void );
BYTE* GetAYRegsPtr( void ) { return &sound_ay_registers[0]; }
static void SetCLK( double CLK ) { m_fCurrentCLK_AY8910 = CLK; }
private:
void sound_end( void );
void sound_ay_overlay( void );
private:
/* foo_subcycles are fixed-point with low 16 bits as fractional part.
* The other bits count as the chip does.
*/
unsigned int ay_tone_tick[3], ay_tone_high[3], ay_noise_tick;
unsigned int ay_tone_subcycles, ay_env_subcycles;
unsigned int ay_env_internal_tick, ay_env_tick;
unsigned int ay_tick_incr;
unsigned int ay_tone_period[3], ay_noise_period, ay_env_period;
//static int beeper_last_subpos[2] = { 0, 0 };
/* Local copy of the AY registers */
libspectrum_byte sound_ay_registers[16];
struct ay_change_tag
{
libspectrum_dword tstates;
unsigned short ofs;
unsigned char reg, val;
};
struct ay_change_tag ay_change[ AY_CHANGE_MAX ];
int ay_change_count;
// statics from sound_ay_overlay()
int rng;
int noise_toggle;
int env_first, env_rev, env_counter;
// Vars shared between all AY's
static double m_fCurrentCLK_AY8910;
};
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#endif