1 files changed, 131 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Nes_Fme7_Apu.h b/plugins/gme/game-music-emu-0.6.0/gme/Nes_Fme7_Apu.h
new file mode 100644
index 00000000..97094897
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6.0/gme/Nes_Fme7_Apu.h
@@ -0,0 +1,131 @@
+// Sunsoft FME-7 sound emulator
+
+// Game_Music_Emu 0.5.5
+#ifndef NES_FME7_APU_H
+#define NES_FME7_APU_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+struct fme7_apu_state_t
+{
+	enum { reg_count = 14 };
+	BOOST::uint8_t regs [reg_count];
+	BOOST::uint8_t phases [3]; // 0 or 1
+	BOOST::uint8_t latch;
+	BOOST::uint16_t delays [3]; // a, b, c
+};
+
+class Nes_Fme7_Apu : private fme7_apu_state_t {
+public:
+	// See Nes_Apu.h for reference
+	void reset();
+	void volume( double );
+	void treble_eq( blip_eq_t const& );
+	void output( Blip_Buffer* );
+	enum { osc_count = 3 };
+	void osc_output( int index, Blip_Buffer* );
+	void end_frame( blip_time_t );
+	void save_state( fme7_apu_state_t* ) const;
+	void load_state( fme7_apu_state_t const& );
+	
+	// Mask and addresses of registers
+	enum { addr_mask = 0xE000 };
+	enum { data_addr = 0xE000 };
+	enum { latch_addr = 0xC000 };
+	
+	// (addr & addr_mask) == latch_addr
+	void write_latch( int );
+	
+	// (addr & addr_mask) == data_addr
+	void write_data( blip_time_t, int data );
+	
+public:
+	Nes_Fme7_Apu();
+	BLARGG_DISABLE_NOTHROW
+private:
+	// noncopyable
+	Nes_Fme7_Apu( const Nes_Fme7_Apu& );
+	Nes_Fme7_Apu& operator = ( const Nes_Fme7_Apu& );
+	
+	static unsigned char const amp_table [16];
+	
+	struct {
+		Blip_Buffer* output;
+		int last_amp;
+	} oscs [osc_count];
+	blip_time_t last_time;
+	
+	enum { amp_range = 192 }; // can be any value; this gives best error/quality tradeoff
+	Blip_Synth<blip_good_quality,1> synth;
+	
+	void run_until( blip_time_t );
+};
+
+inline void Nes_Fme7_Apu::volume( double v )
+{
+	synth.volume( 0.38 / amp_range * v ); // to do: fine-tune
+}
+
+inline void Nes_Fme7_Apu::treble_eq( blip_eq_t const& eq )
+{
+	synth.treble_eq( eq );
+}
+
+inline void Nes_Fme7_Apu::osc_output( int i, Blip_Buffer* buf )
+{
+	assert( (unsigned) i < osc_count );
+	oscs [i].output = buf;
+}
+
+inline void Nes_Fme7_Apu::output( Blip_Buffer* buf )
+{
+	for ( int i = 0; i < osc_count; i++ )
+		osc_output( i, buf );
+}
+
+inline Nes_Fme7_Apu::Nes_Fme7_Apu()
+{
+	output( NULL );
+	volume( 1.0 );
+	reset();
+}
+
+inline void Nes_Fme7_Apu::write_latch( int data ) { latch = data; }
+
+inline void Nes_Fme7_Apu::write_data( blip_time_t time, int data )
+{
+	if ( (unsigned) latch >= reg_count )
+	{
+		#ifdef debug_printf
+			debug_printf( "FME7 write to %02X (past end of sound registers)\n", (int) latch );
+		#endif
+		return;
+	}
+	
+	run_until( time );
+	regs [latch] = data;
+}
+
+inline void Nes_Fme7_Apu::end_frame( blip_time_t time )
+{
+	if ( time > last_time )
+		run_until( time );
+	
+	assert( last_time >= time );
+	last_time -= time;
+}
+
+inline void Nes_Fme7_Apu::save_state( fme7_apu_state_t* out ) const
+{
+	*out = *this;
+}
+
+inline void Nes_Fme7_Apu::load_state( fme7_apu_state_t const& in )
+{
+	reset();
+	fme7_apu_state_t* state = this;
+	*state = in;
+}
+
+#endif