1 files changed, 83 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Sap_Cpu.h b/plugins/gme/game-music-emu-0.6.0/gme/Sap_Cpu.h
new file mode 100644
index 00000000..bde219f6
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6.0/gme/Sap_Cpu.h
@@ -0,0 +1,83 @@
+// Atari 6502 CPU emulator
+
+// Game_Music_Emu 0.5.5
+#ifndef SAP_CPU_H
+#define SAP_CPU_H
+
+#include "blargg_common.h"
+
+typedef blargg_long sap_time_t; // clock cycle count
+typedef unsigned sap_addr_t; // 16-bit address
+enum { future_sap_time = INT_MAX / 2 + 1 };
+
+class Sap_Cpu {
+public:
+	typedef BOOST::uint8_t uint8_t;
+	
+	// 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( sap_time_t end_time );
+	
+	// Registers are not updated until run() returns (except I flag in status)
+	struct registers_t {
+		BOOST::uint16_t pc;
+		BOOST::uint8_t a;
+		BOOST::uint8_t x;
+		BOOST::uint8_t y;
+		BOOST::uint8_t status;
+		BOOST::uint8_t sp;
+	};
+	registers_t r;
+	
+	enum { idle_addr = 0xFEFF };
+	
+	// Time of beginning of next instruction to be executed
+	sap_time_t time() const             { return state->time + state->base; }
+	void set_time( sap_time_t t )       { state->time = t - state->base; }
+	void adjust_time( int delta )       { state->time += delta; }
+	
+	sap_time_t irq_time() const         { return irq_time_; }
+	void set_irq_time( sap_time_t );
+	
+	sap_time_t end_time() const         { return end_time_; }
+	void set_end_time( sap_time_t );
+	
+public:
+	Sap_Cpu() { state = &state_; }
+	enum { irq_inhibit = 0x04 };
+private:
+	struct state_t {
+		sap_time_t base;
+		sap_time_t time;
+	};
+	state_t* state; // points to state_ or a local copy within run()
+	state_t state_;
+	sap_time_t irq_time_;
+	sap_time_t end_time_;
+	uint8_t* mem;
+	
+	inline sap_time_t update_end_time( sap_time_t end, sap_time_t irq );
+};
+
+inline sap_time_t Sap_Cpu::update_end_time( sap_time_t t, sap_time_t irq )
+{
+	if ( irq < t && !(r.status & irq_inhibit) ) t = irq;
+	sap_time_t delta = state->base - t;
+	state->base = t;
+	return delta;
+}
+
+inline void Sap_Cpu::set_irq_time( sap_time_t t )
+{
+	state->time += update_end_time( end_time_, (irq_time_ = t) );
+}
+
+inline void Sap_Cpu::set_end_time( sap_time_t t )
+{
+	state->time += update_end_time( (end_time_ = t), irq_time_ );
+}
+
+#endif