1 files changed, 92 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Ay_Cpu.h b/plugins/gme/game-music-emu-0.6.0/gme/Ay_Cpu.h
new file mode 100644
index 00000000..2f4d351e
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6.0/gme/Ay_Cpu.h
@@ -0,0 +1,92 @@
+// Z80 CPU emulator
+
+// Game_Music_Emu 0.5.5
+#ifndef AY_CPU_H
+#define AY_CPU_H
+
+#include "blargg_endian.h"
+
+typedef blargg_long cpu_time_t;
+
+// must be defined by caller
+void ay_cpu_out( class Ay_Cpu*, cpu_time_t, unsigned addr, int data );
+int ay_cpu_in( class Ay_Cpu*, unsigned addr );
+
+class Ay_Cpu {
+public:
+	// Clear all registers and keep pointer to 64K memory passed in
+	void reset( void* mem_64k );
+	
+	// Run until specified time is reached. Returns true if suspicious/unsupported
+	// instruction was encountered at any point during run.
+	bool run( cpu_time_t end_time );
+	
+	// Time of beginning of next instruction
+	cpu_time_t time() const             { return state->time + state->base; }
+	
+	// Alter current time. Not supported during run() call.
+	void set_time( cpu_time_t t )       { state->time = t - state->base; }
+	void adjust_time( int delta )       { state->time += delta; }
+	
+	typedef BOOST::uint8_t uint8_t;
+	typedef BOOST::uint16_t uint16_t;
+	
+	#if BLARGG_BIG_ENDIAN
+		struct regs_t { uint8_t b, c, d, e, h, l, flags, a; };
+	#else
+		struct regs_t { uint8_t c, b, e, d, l, h, a, flags; };
+	#endif
+	BOOST_STATIC_ASSERT( sizeof (regs_t) == 8 );
+	
+	struct pairs_t { uint16_t bc, de, hl, fa; };
+	
+	// Registers are not updated until run() returns
+	struct registers_t {
+		uint16_t pc;
+		uint16_t sp;
+		uint16_t ix;
+		uint16_t iy;
+		union {
+			regs_t b; //  b.b, b.c, b.d, b.e, b.h, b.l, b.flags, b.a
+			pairs_t w; // w.bc, w.de, w.hl. w.fa
+		};
+		union {
+			regs_t b;
+			pairs_t w;
+		} alt;
+		uint8_t iff1;
+		uint8_t iff2;
+		uint8_t r;
+		uint8_t i;
+		uint8_t im;
+	};
+	//registers_t r; (below for efficiency)
+	
+	// can read this far past end of memory
+	enum { cpu_padding = 0x100 };
+	
+public:
+	Ay_Cpu();
+private:
+	uint8_t szpc [0x200];
+	uint8_t* mem;
+	cpu_time_t end_time_;
+	struct state_t {
+		cpu_time_t base;
+		cpu_time_t time;
+	};
+	state_t* state; // points to state_ or a local copy within run()
+	state_t state_;
+	void set_end_time( cpu_time_t t );
+public:
+	registers_t r;
+};
+
+inline void Ay_Cpu::set_end_time( cpu_time_t t )
+{
+	cpu_time_t delta = state->base - t;
+	state->base = t;
+	state->time += delta;
+}
+
+#endif