82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
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// Sinclair Spectrum AY music emulator core
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// Game_Music_Emu $vers
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#ifndef AY_CORE_H
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#define AY_CORE_H
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#include "Z80_Cpu.h"
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#include "Ay_Apu.h"
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class Ay_Core {
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public:
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// Clock count
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typedef int time_t;
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// Sound chip access, to assign it to Blip_Buffer etc.
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Ay_Apu& apu() { return apu_; }
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// Sets beeper sound buffer, or NULL to mute it. Volume and treble EQ of
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// beeper are set by APU.
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void set_beeper_output( Blip_Buffer* );
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// Sets time between calls to play routine. Can be changed while playing.
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void set_play_period( time_t p ) { play_period = p; }
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// 64K memory to load code and data into before starting track. Caller
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// must parse the AY file.
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BOOST::uint8_t* mem() { return mem_.ram; }
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enum { mem_size = 0x10000 };
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enum { ram_addr = 0x4000 }; // where official RAM starts
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// Starts track using specified register values, and sets play routine that
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// is called periodically
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typedef Z80_Cpu::registers_t registers_t;
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typedef int addr_t;
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void start_track( registers_t const&, addr_t play );
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// Ends time frame of at most *end clocks and sets *end to number of clocks
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// emulated. Until Spectrum/CPC mode is determined, *end is HALVED.
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void end_frame( time_t* end );
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// Called when CPC hardware is first accessed. AY file format doesn't specify
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// which sound hardware is used, so it must be determined during playback
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// based on which sound port is first used.
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blargg_callback<void (*)( void* )> set_cpc_callback;
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// Implementation
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public:
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Ay_Core();
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~Ay_Core();
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private:
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Blip_Buffer* beeper_output;
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int beeper_delta;
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int last_beeper;
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int beeper_mask;
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addr_t play_addr;
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time_t play_period;
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time_t next_play;
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int cpc_latch;
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bool spectrum_mode;
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bool cpc_mode;
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// large items
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Z80_Cpu cpu;
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struct {
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BOOST::uint8_t padding1 [0x100];
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BOOST::uint8_t ram [mem_size + 0x100];
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} mem_;
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Ay_Apu apu_;
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int cpu_in( addr_t );
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void cpu_out( time_t, addr_t, int data );
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void cpu_out_( time_t, addr_t, int data );
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bool run_cpu( time_t end );
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void disable_beeper();
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};
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#endif
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