1 files changed, 90 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Gb_Apu.h b/plugins/gme/game-music-emu-0.6.0/gme/Gb_Apu.h
new file mode 100644
index 00000000..e74ebc55
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+++ b/plugins/gme/game-music-emu-0.6.0/gme/Gb_Apu.h
@@ -0,0 +1,90 @@
+// Nintendo Game Boy PAPU sound chip emulator
+
+// Gb_Snd_Emu 0.1.5
+#ifndef GB_APU_H
+#define GB_APU_H
+
+#include "Gb_Oscs.h"
+
+class Gb_Apu {
+public:
+	
+	// Set overall volume of all oscillators, where 1.0 is full volume
+	void volume( double );
+	
+	// Set treble equalization
+	void treble_eq( const blip_eq_t& );
+	
+	// Outputs can be assigned to a single buffer for mono output, or to three
+	// buffers for stereo output (using Stereo_Buffer to do the mixing).
+	
+	// Assign all oscillator outputs to specified buffer(s). If buffer
+	// is NULL, silences all oscillators.
+	void output( Blip_Buffer* mono );
+	void output( Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
+	
+	// Assign single oscillator output to buffer(s). Valid indicies are 0 to 3,
+	// which refer to Square 1, Square 2, Wave, and Noise. If buffer is NULL,
+	// silences oscillator.
+	enum { osc_count = 4 };
+	void osc_output( int index, Blip_Buffer* mono );
+	void osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
+	
+	// Reset oscillators and internal state
+	void reset();
+	
+	// Reads and writes at addr must satisfy start_addr <= addr <= end_addr
+	enum { start_addr = 0xFF10 };
+	enum { end_addr   = 0xFF3F };
+	enum { register_count = end_addr - start_addr + 1 };
+	
+	// Write 'data' to address at specified time
+	void write_register( blip_time_t, unsigned addr, int data );
+	
+	// Read from address at specified time
+	int read_register( blip_time_t, unsigned addr );
+	
+	// Run all oscillators up to specified time, end current time frame, then
+	// start a new frame at time 0.
+	void end_frame( blip_time_t );
+	
+	void set_tempo( double );
+	
+public:
+	Gb_Apu();
+private:
+	// noncopyable
+	Gb_Apu( const Gb_Apu& );
+	Gb_Apu& operator = ( const Gb_Apu& );
+	
+	Gb_Osc*     oscs [osc_count];
+	blip_time_t   next_frame_time;
+	blip_time_t   last_time;
+	blip_time_t frame_period;
+	double      volume_unit;
+	int         frame_count;
+	
+	Gb_Square   square1;
+	Gb_Square   square2;
+	Gb_Wave     wave;
+	Gb_Noise    noise;
+	BOOST::uint8_t regs [register_count];
+	Gb_Square::Synth square_synth; // used by squares
+	Gb_Wave::Synth   other_synth;  // used by wave and noise
+	
+	void update_volume();
+	void run_until( blip_time_t );
+	void write_osc( int index, int reg, int data );
+};
+
+inline void Gb_Apu::output( Blip_Buffer* b ) { output( b, b, b ); }
+	
+inline void Gb_Apu::osc_output( int i, Blip_Buffer* b ) { osc_output( i, b, b, b ); }
+
+inline void Gb_Apu::volume( double vol )
+{
+	volume_unit = 0.60 / osc_count / 15 /*steps*/ / 2 /*?*/ / 8 /*master vol range*/ * vol;
+	update_volume();
+}
+
+#endif