1 files changed, 125 insertions, 0 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Hes_Cpu.h b/plugins/gme/Game_Music_Emu-0.5.2/gme/Hes_Cpu.h
new file mode 100644
index 00000000..437d0908
--- /dev/null
+++ b/plugins/gme/Game_Music_Emu-0.5.2/gme/Hes_Cpu.h
@@ -0,0 +1,125 @@
+// PC Engine CPU emulator for use with HES music files
+
+// Game_Music_Emu 0.5.2
+#ifndef HES_CPU_H
+#define HES_CPU_H
+
+#include "blargg_common.h"
+#include <limits.h>
+
+typedef blargg_long hes_time_t; // clock cycle count
+typedef unsigned hes_addr_t; // 16-bit address
+enum { future_hes_time = LONG_MAX / 2 + 1 };
+
+class Hes_Cpu {
+public:
+	typedef BOOST::uint8_t uint8_t;
+	
+	void reset();
+	
+	enum { page_size = 0x2000 };
+	enum { page_shift = 13 };
+	enum { page_count = 8 };
+	void set_mmr( int reg, int bank );
+	
+	uint8_t const* get_code( hes_addr_t );
+	
+	uint8_t ram [page_size];
+	
+	// not kept updated during a call to run()
+	struct registers_t {
+		BOOST::uint16_t pc;
+		uint8_t a;
+		uint8_t x;
+		uint8_t y;
+		uint8_t status;
+		uint8_t sp;
+	};
+	registers_t r;
+	
+	// page mapping registers
+	uint8_t mmr [page_count + 1];
+	
+	// Set end_time and run CPU from current time. Returns true if any illegal
+	// instructions were encountered.
+	bool run( hes_time_t end_time );
+	
+	// Time of beginning of next instruction to be executed
+	hes_time_t time() const             { return state->time + state->base; }
+	void set_time( hes_time_t t )       { state->time = t - state->base; }
+	void adjust_time( int delta )       { state->time += delta; }
+	
+	hes_time_t irq_time() const         { return irq_time_; }
+	void set_irq_time( hes_time_t );
+	
+	hes_time_t end_time() const         { return end_time_; }
+	void set_end_time( hes_time_t );
+	
+	void end_frame( hes_time_t );
+	
+	// Attempt to execute instruction here results in CPU advancing time to
+	// lesser of irq_time() and end_time() (or end_time() if IRQs are
+	// disabled)
+	enum { idle_addr = 0x1FFF };
+	
+	// Can read this many bytes past end of a page
+	enum { cpu_padding = 8 };
+	
+public:
+	Hes_Cpu() { state = &state_; }
+	enum { irq_inhibit = 0x04 };
+private:
+	// noncopyable
+	Hes_Cpu( const Hes_Cpu& );
+	Hes_Cpu& operator = ( const Hes_Cpu& );
+	
+	struct state_t {
+		uint8_t const* code_map [page_count + 1];
+		hes_time_t base;
+		blargg_long time;
+	};
+	state_t* state; // points to state_ or a local copy within run()
+	state_t state_;
+	hes_time_t irq_time_;
+	hes_time_t end_time_;
+	
+	void set_code_page( int, void const* );
+	inline int update_end_time( hes_time_t end, hes_time_t irq );
+};
+
+inline BOOST::uint8_t const* Hes_Cpu::get_code( hes_addr_t addr )
+{
+	return state->code_map [addr >> page_shift] + addr
+	#if !BLARGG_NONPORTABLE
+		% (unsigned) page_size
+	#endif
+	;
+}
+
+inline int Hes_Cpu::update_end_time( hes_time_t t, hes_time_t irq )
+{
+	if ( irq < t && !(r.status & irq_inhibit) ) t = irq;
+	int delta = state->base - t;
+	state->base = t;
+	return delta;
+}
+
+inline void Hes_Cpu::set_irq_time( hes_time_t t )
+{
+	state->time += update_end_time( end_time_, (irq_time_ = t) );
+}
+
+inline void Hes_Cpu::set_end_time( hes_time_t t )
+{
+	state->time += update_end_time( (end_time_ = t), irq_time_ );
+}
+
+inline void Hes_Cpu::end_frame( hes_time_t t )
+{
+	assert( state == &state_ );
+	state_.base -= t;
+	if ( irq_time_ < future_hes_time ) irq_time_ -= t;
+	if ( end_time_ < future_hes_time ) end_time_ -= t;
+}
+
+#endif