1 files changed, 106 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Gbs_Core.h b/plugins/gme/game-music-emu-0.6pre/gme/Gbs_Core.h
new file mode 100644
index 00000000..f5a3ca69
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6pre/gme/Gbs_Core.h
@@ -0,0 +1,106 @@
+// Nintendo Game Boy GBS music file emulator core
+
+// Game_Music_Emu 0.6-pre
+#ifndef GBS_CORE_H
+#define GBS_CORE_H
+
+#include "Gme_Loader.h"
+#include "Rom_Data.h"
+#include "Gb_Cpu.h"
+#include "Gb_Apu.h"
+
+class Gbs_Core : public Gme_Loader {
+public:
+
+	// GBS file header
+	struct header_t
+	{
+		enum { size = 112 };
+		
+		char tag       [ 3];
+		byte vers;
+		byte track_count;
+		byte first_track;
+		byte load_addr [ 2];
+		byte init_addr [ 2];
+		byte play_addr [ 2];
+		byte stack_ptr [ 2];
+		byte timer_modulo;
+		byte timer_mode;
+		char game      [32]; // strings can be 32 chars, NOT terminated
+		char author    [32];
+		char copyright [32];
+		
+		// True if header has valid file signature
+		bool valid_tag() const;
+	};
+	
+	// Header for currently loaded file
+	header_t const& header() const      { return header_; }
+	
+	// Sound chip
+	Gb_Apu& apu()                       { return apu_; }
+	
+	// Adjusts music tempo, where 1.0 is normal. Can be changed while playing.
+	void set_tempo( double );
+	
+	// Starts track, where 0 is the first. Uses specified APU mode.
+	blargg_err_t start_track( int, Gb_Apu::mode_t = Gb_Apu::mode_cgb );
+	
+	// Ends time frame at time t
+	typedef int time_t; // clock count
+	blargg_err_t end_frame( time_t t );
+	
+	// Clocks between calls to play routine
+	time_t play_period() const          { return play_period_; }
+	
+protected:
+	typedef int addr_t;
+	
+	// Current time
+	time_t time() const                 { return cpu.time() + end_time; }
+	
+	// Runs emulator to time t
+	blargg_err_t run_until( time_t t );
+
+	// Runs CPU until time becomes >= 0
+	void run_cpu();
+	
+	// Reads/writes memory and I/O
+	int  read_mem(  addr_t );
+	void write_mem( addr_t, int );
+
+// Implementation
+public:
+	Gbs_Core();
+	~Gbs_Core();
+	virtual void unload();
+
+protected:
+	virtual blargg_err_t load_( Data_Reader& );
+	
+private:
+	enum { ram_addr = 0xA000 };
+	enum { io_base = 0xFF00 };
+	enum { hi_page = io_base - ram_addr };
+	
+	Rom_Data  rom;
+	int       tempo;
+	time_t    end_time;
+	time_t    play_period_;
+	time_t    next_play;
+	header_t  header_;
+	Gb_Cpu    cpu;
+	Gb_Apu    apu_;
+	byte      ram [0x4000 + 0x2000 + Gb_Cpu::cpu_padding];
+	
+	void update_timer();
+	void jsr_then_stop( byte const [] );
+	void set_bank( int n );
+	void write_io_inline( int offset, int data, int base );
+	void write_io_( int offset, int data );
+	int  read_io(  int offset );
+	void write_io( int offset, int data );
+};
+
+#endif