Hes_Emu.h

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// TurboGrafx-16/PC Engine HES music file emulator
 
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
#ifndef HES_EMU_H
#define HES_EMU_H
 
#include "Classic_Emu.h"
#include "Hes_Apu.h"
#include "Hes_Cpu.h"
 
class Hes_Emu : private Hes_Cpu, public Classic_Emu {
        typedef Hes_Cpu cpu;
public:
        // HES file header
        enum { header_size = 0x20 };
        struct header_t
        {
                byte tag [4];
                byte vers;
                byte first_track;
                byte init_addr [2];
                byte banks [8];
                byte data_tag [4];
                byte size [4];
                byte addr [4];
                byte unused [4];
        };
        
        // Header for currently loaded file
        header_t const& header() const { return header_; }
        
        static gme_type_t static_type() { return gme_hes_type; }
 
public:
        Hes_Emu();
        ~Hes_Emu();
protected:
        blargg_err_t track_info_( track_info_t*, int track ) const;
        blargg_err_t load_( Data_Reader& );
        blargg_err_t start_track_( int );
        blargg_err_t run_clocks( blip_time_t&, int );
        void set_tempo_( double );
        void set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* );
        void update_eq( blip_eq_t const& );
        void unload();
public: private: friend class Hes_Cpu;
        byte* write_pages [page_count + 1]; // 0 if unmapped or I/O space
        
        int cpu_read_( hes_addr_t );
        int cpu_read( hes_addr_t );
        void cpu_write_( hes_addr_t, int data );
        void cpu_write( hes_addr_t, int );
        void cpu_write_vdp( int addr, int data );
        byte const* cpu_set_mmr( int page, int bank );
        int cpu_done();
private:
        Rom_Data<page_size> rom;
        header_t header_;
        hes_time_t play_period;
        hes_time_t last_frame_hook;
        int timer_base;
        
        struct {
                hes_time_t last_time;
                blargg_long count;
                blargg_long load;
                int raw_load;
                byte enabled;
                byte fired;
        } timer;
        
        struct {
                hes_time_t next_vbl;
                byte latch;
                byte control;
        } vdp;
        
        struct {
                hes_time_t timer;
                hes_time_t vdp;
                byte disables;
        } irq;
        
        void recalc_timer_load();
        
        // large items
        Hes_Apu apu;
        byte sgx [3 * page_size + cpu_padding];
        
        void irq_changed();
        void run_until( hes_time_t );
};
 
#endif