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