/gme/Kss_Emu.h

 1// MSX computer KSS music file emulator
 2
 3// Game_Music_Emu 0.5.5
 4#ifndef KSS_EMU_H
 5#define KSS_EMU_H
 6
 7#include "Classic_Emu.h"
 8#include "Kss_Scc_Apu.h"
 9#include "Kss_Cpu.h"
10#include "Sms_Apu.h"
11#include "Ay_Apu.h"
12
13class Kss_Emu : private Kss_Cpu, public Classic_Emu {
14	typedef Kss_Cpu cpu;
15public:
16	// KSS file header
17	enum { header_size = 0x10 };
18	struct header_t
19	{
20		byte tag [4];
21		byte load_addr [2];
22		byte load_size [2];
23		byte init_addr [2];
24		byte play_addr [2];
25		byte first_bank;
26		byte bank_mode;
27		byte extra_header;
28		byte device_flags;
29	};
30	
31	enum { ext_header_size = 0x10 };
32	struct ext_header_t
33	{
34		byte data_size [4];
35		byte unused [4];
36		byte first_track [2];
37		byte last_tack [2];
38		byte psg_vol;
39		byte scc_vol;
40		byte msx_music_vol;
41		byte msx_audio_vol;
42	};
43	
44	struct composite_header_t : header_t, ext_header_t { };
45	
46	// Header for currently loaded file
47	composite_header_t const& header() const { return header_; }
48	
49	static gme_type_t static_type() { return gme_kss_type; }
50public:
51	Kss_Emu();
52	~Kss_Emu();
53protected:
54	blargg_err_t track_info_( track_info_t*, int track ) const;
55	blargg_err_t load_( Data_Reader& );
56	blargg_err_t start_track_( int );
57	blargg_err_t run_clocks( blip_time_t&, int );
58	void set_tempo_( double );
59	void set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* );
60	void update_eq( blip_eq_t const& );
61	void unload();
62private:
63	Rom_Data<page_size> rom;
64	composite_header_t header_;
65	
66	bool scc_accessed;
67	bool gain_updated;
68	void update_gain();
69	
70	unsigned scc_enabled; // 0 or 0xC000
71	byte const* bank_data;
72	int bank_count;
73	void set_bank( int logical, int physical );
74	blargg_long bank_size() const { return (16 * 1024L) >> (header_.bank_mode >> 7 & 1); }
75	
76	blip_time_t play_period;
77	blip_time_t next_play;
78	int ay_latch;
79	
80	friend void kss_cpu_out( class Kss_Cpu*, cpu_time_t, unsigned addr, int data );
81	friend int  kss_cpu_in( class Kss_Cpu*, cpu_time_t, unsigned addr );
82	void cpu_write( unsigned addr, int data );
83	friend void kss_cpu_write( class Kss_Cpu*, unsigned addr, int data );
84	
85	// large items
86	enum { mem_size = 0x10000 };
87	byte ram [mem_size + cpu_padding];
88	
89	Ay_Apu ay;
90	Scc_Apu scc;
91	Sms_Apu* sn;
92	byte unmapped_read  [0x100];
93	byte unmapped_write [page_size];
94};
95
96#endif