79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
#pragma once
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//-------------------------------------
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// FUSE stuff
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typedef ULONG libspectrum_dword;
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typedef UCHAR libspectrum_byte;
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typedef SHORT libspectrum_signed_word;
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/* max. number of sub-frame AY port writes allowed;
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* given the number of port writes theoretically possible in a
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* 50th I think this should be plenty.
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*/
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#define AY_CHANGE_MAX 8000
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class AY8913
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{
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public:
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AY8913(void);
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~AY8913(void) {};
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void sound_ay_init( void );
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void sound_init( const char *device );
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BYTE sound_ay_read( int reg ); // TC
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void sound_ay_write( int reg, int val, libspectrum_dword now );
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void sound_ay_reset( void );
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void sound_frame( void );
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BYTE* GetAYRegsPtr( void ) { return &sound_ay_registers[0]; }
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void SetFramesize(int frameSize) { sound_generator_framesiz = frameSize; }
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void SetSoundBuffers(INT16** buffers) { ppSoundBuffers = buffers; }
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static void SetCLK( double CLK ) { m_fCurrentCLK_AY8910 = CLK; }
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void SaveSnapshot(class YamlSaveHelper& yamlSaveHelper, const std::string& suffix);
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bool LoadSnapshot(class YamlLoadHelper& yamlLoadHelper, const std::string& suffix);
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private:
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void init( void );
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void sound_end( void );
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void sound_ay_overlay( void );
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private:
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/* foo_subcycles are fixed-point with low 16 bits as fractional part.
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* The other bits count as the chip does.
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*/
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unsigned int ay_tone_tick[3], ay_tone_high[3], ay_noise_tick;
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unsigned int ay_tone_subcycles, ay_env_subcycles;
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unsigned int ay_env_internal_tick, ay_env_tick;
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unsigned int ay_tick_incr;
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unsigned int ay_tone_period[3], ay_noise_period, ay_env_period;
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//static int beeper_last_subpos[2] = { 0, 0 };
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/* Local copy of the AY registers */
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libspectrum_byte sound_ay_registers[16];
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struct ay_change_tag
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{
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libspectrum_dword tstates;
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unsigned short ofs;
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unsigned char reg, val;
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};
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struct ay_change_tag ay_change[ AY_CHANGE_MAX ];
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int ay_change_count;
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// statics from sound_ay_overlay()
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int rng;
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int noise_toggle;
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int env_first, env_rev, env_counter;
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// Vars
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libspectrum_signed_word** ppSoundBuffers; // Used to pass param to sound_ay_overlay()
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int sound_generator_framesiz;
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int sound_generator_freq;
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unsigned int ay_tone_levels[16];
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// Vars shared between all AY's
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static double m_fCurrentCLK_AY8910;
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};
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