AppleWin/source/AY8910.h

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C
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#pragma once
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//-------------------------------------
// 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 AY8913
{
public:
AY8913(void);
~AY8913(void) {};
void sound_ay_init( void );
void sound_init( const char *device );
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BYTE sound_ay_read( int reg ); // TC
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]; }
void SetFramesize(int frameSize) { sound_generator_framesiz = frameSize; }
void SetSoundBuffers(INT16** buffers) { ppSoundBuffers = buffers; }
static void SetCLK( double CLK ) { m_fCurrentCLK_AY8910 = CLK; }
void SaveSnapshot(class YamlSaveHelper& yamlSaveHelper, const std::string& suffix);
bool LoadSnapshot(class YamlLoadHelper& yamlLoadHelper, const std::string& suffix);
private:
void init( void );
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
libspectrum_signed_word** ppSoundBuffers; // Used to pass param to sound_ay_overlay()
int sound_generator_framesiz;
int sound_generator_freq;
unsigned int ay_tone_levels[16];
// Vars shared between all AY's
static double m_fCurrentCLK_AY8910;
};