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// TurboGrafx-16/PC Engine HES music file emulator core
// Game_Music_Emu 0.6-pre
#ifndef HES_CORE_H
#define HES_CORE_H
#include "Gme_Loader.h"
#include "Rom_Data.h"
#include "Hes_Apu.h"
#include "Hes_Apu_Adpcm.h"
#include "Hes_Cpu.h"
class Hes_Core : public Gme_Loader {
public:
// HES file header
enum { info_offset = 0x20 };
struct header_t
{
enum { size = 0x20 };
byte tag [4];
byte vers;
byte first_track;
byte init_addr [2];
byte banks [8];
byte data_tag [4];
byte data_size [4];
byte addr [4];
byte unused [4];
// True if header has valid file signature
bool valid_tag() const;
};
// Header for currently loaded file
header_t const& header() const { return header_; }
// Pointer to ROM data, for getting track information from
byte const* data() const { return rom.begin(); }
// Adjusts rate play routine is called at, where 1.0 is normal.
// Can be changed while track is playing.
void set_tempo( double );
// Sound chip
Hes_Apu& apu() { return apu_; }
Hes_Apu_Adpcm& adpcm() { return adpcm_; }
// Starts track
blargg_err_t start_track( int );
// Ends time frame at time t
typedef int time_t;
blargg_err_t end_frame( time_t );
// Implementation
public:
Hes_Core();
~Hes_Core();
virtual void unload();
protected:
virtual blargg_err_t load_( Data_Reader& );
private:
enum { idle_addr = 0x1FFF };
typedef int addr_t;
Hes_Cpu cpu;
Rom_Data rom;
header_t header_;
time_t play_period;
int timer_base;
struct {
time_t last_time;
int count;
int load;
int raw_load;
byte enabled;
byte fired;
} timer;
struct {
time_t next_vbl;
byte latch;
byte control;
} vdp;
struct {
time_t timer;
time_t vdp;
byte disables;
} irq;
void recalc_timer_load();
// large items
byte* write_pages [Hes_Cpu::page_count + 1]; // 0 if unmapped or I/O space
Hes_Apu apu_;
Hes_Apu_Adpcm adpcm_;
byte ram [Hes_Cpu::page_size];
byte sgx [3 * Hes_Cpu::page_size + Hes_Cpu::cpu_padding];
void irq_changed();
void run_until( time_t );
bool run_cpu( time_t end );
int read_mem_( addr_t );
int read_mem( addr_t );
void write_mem_( addr_t, int data );
void write_mem( addr_t, int );
void write_vdp( int addr, int data );
void set_mmr( int reg, int bank );
int cpu_done();
};
#endif
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