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