1 files changed, 80 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Nes_Vrc7_Apu.h b/plugins/gme/game-music-emu-0.6pre/gme/Nes_Vrc7_Apu.h
new file mode 100644
index 00000000..60ea1631
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6pre/gme/Nes_Vrc7_Apu.h
@@ -0,0 +1,80 @@
+// Konami VRC7 sound chip emulator
+
+#ifndef NES_VRC7_APU_H
+#define NES_VRC7_APU_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+struct vrc7_snapshot_t;
+
+class Nes_Vrc7_Apu {
+public:
+	blargg_err_t init();
+	
+	// See Nes_Apu.h for reference
+	void reset();
+	void volume( double );
+	void treble_eq( blip_eq_t const& );
+	void set_output( Blip_Buffer* );
+	enum { osc_count = 6 };
+	void set_output( int index, Blip_Buffer* );
+	void end_frame( blip_time_t );
+	void save_snapshot( vrc7_snapshot_t* ) const;
+	void load_snapshot( vrc7_snapshot_t const& );
+	
+	void write_reg( int reg );
+	void write_data( blip_time_t, int data );
+	
+public:
+	Nes_Vrc7_Apu();
+	~Nes_Vrc7_Apu();
+	BLARGG_DISABLE_NOTHROW
+private:
+	// noncopyable
+	Nes_Vrc7_Apu( const Nes_Vrc7_Apu& );
+	Nes_Vrc7_Apu& operator = ( const Nes_Vrc7_Apu& );
+
+	struct Vrc7_Osc
+	{
+		BOOST::uint8_t regs [3];
+		Blip_Buffer* output;
+		int last_amp;
+	};
+
+	Vrc7_Osc oscs [osc_count];
+	void* opll;
+	int addr;
+	blip_time_t next_time;
+	struct {
+		Blip_Buffer* output;
+		int last_amp;
+	} mono;
+	
+	Blip_Synth_Fast synth;
+	
+	void run_until( blip_time_t );
+	void output_changed();
+};
+
+struct vrc7_snapshot_t
+{
+	BOOST::uint8_t latch;
+	BOOST::uint8_t inst [8];
+	BOOST::uint8_t regs [6] [3];
+	BOOST::uint8_t delay;
+};
+
+inline void Nes_Vrc7_Apu::set_output( int i, Blip_Buffer* buf )
+{
+	assert( (unsigned) i < osc_count );
+	oscs [i].output = buf;
+	output_changed();
+}
+
+// DB2LIN_AMP_BITS == 11, * 2
+inline void Nes_Vrc7_Apu::volume( double v ) { synth.volume( 1.0 / 3 / 4096 * v ); }
+
+inline void Nes_Vrc7_Apu::treble_eq( blip_eq_t const& eq ) { synth.treble_eq( eq ); }
+
+#endif