101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
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// MSX computer KSS music file emulator
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// Game_Music_Emu $vers
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#ifndef KSS_CORE_H
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#define KSS_CORE_H
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#include "Gme_Loader.h"
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#include "Rom_Data.h"
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#include "Z80_Cpu.h"
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class Kss_Core : public Gme_Loader {
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public:
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// KSS file header
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struct header_t
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{
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enum { size = 0x20 };
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enum { base_size = 0x10 };
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enum { ext_size = size - base_size };
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byte tag [4];
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byte load_addr [2];
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byte load_size [2];
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byte init_addr [2];
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byte play_addr [2];
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byte first_bank;
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byte bank_mode;
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byte extra_header;
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byte device_flags;
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// KSSX extended data, if extra_header==0x10
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byte data_size [4];
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byte unused [4];
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byte first_track [2];
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byte last_track [2]; // if no extended data, we set this to 0xFF
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byte psg_vol;
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byte scc_vol;
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byte msx_music_vol;
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byte msx_audio_vol;
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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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// ROM data
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Rom_Data const& rom_() const { return rom; }
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typedef int time_t;
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void set_play_period( time_t p ) { play_period = p; }
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blargg_err_t start_track( int );
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blargg_err_t end_frame( time_t );
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protected:
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typedef Z80_Cpu Kss_Cpu;
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Kss_Cpu cpu;
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void set_bank( int logical, int physical );
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typedef int addr_t;
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virtual void cpu_write( addr_t, int ) = 0;
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virtual int cpu_in( time_t, addr_t );
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virtual void cpu_out( time_t, addr_t, int );
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// Called after one frame of emulation
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virtual void update_gain() = 0;
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// Implementation
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public:
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Kss_Core();
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virtual ~Kss_Core();
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protected:
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virtual blargg_err_t load_( Data_Reader& );
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virtual void unload();
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private:
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enum { idle_addr = 0xFFFF };
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Rom_Data rom;
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header_t header_;
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bool gain_updated;
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int bank_count;
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time_t play_period;
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time_t next_play;
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// large items
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enum { mem_size = 0x10000 };
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byte ram [mem_size + Kss_Cpu::cpu_padding];
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byte unmapped_read [0x100]; // TODO: why isn't this page_size?
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// because CPU can't read beyond this in last page? or because it will spill into unmapped_write?
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byte unmapped_write [Kss_Cpu::page_size];
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int bank_size() const { return (16 * 1024) >> (header_.bank_mode >> 7 & 1); }
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bool run_cpu( time_t end );
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void jsr( byte const (&addr) [2] );
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};
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#endif
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