1 files changed, 75 insertions, 0 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Sms_Apu.h b/plugins/gme/Game_Music_Emu-0.5.2/gme/Sms_Apu.h
new file mode 100644
index 00000000..3c11a9c3
--- /dev/null
+++ b/plugins/gme/Game_Music_Emu-0.5.2/gme/Sms_Apu.h
@@ -0,0 +1,75 @@
+// Sega Master System SN76489 PSG sound chip emulator
+
+// Sms_Snd_Emu 0.1.4
+#ifndef SMS_APU_H
+#define SMS_APU_H
+
+#include "Sms_Oscs.h"
+
+class Sms_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, Square 3, 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( unsigned noise_feedback = 0, int noise_width = 0 );
+	
+	// Write GameGear left/right assignment byte
+	void write_ggstereo( blip_time_t, int );
+	
+	// Write to data port
+	void write_data( blip_time_t, int );
+	
+	// Run all oscillators up to specified time, end current frame, then
+	// start a new frame at time 0.
+	void end_frame( blip_time_t );
+
+public:
+	Sms_Apu();
+	~Sms_Apu();
+private:
+	// noncopyable
+	Sms_Apu( const Sms_Apu& );
+	Sms_Apu& operator = ( const Sms_Apu& );
+	
+	Sms_Osc*    oscs [osc_count];
+	Sms_Square  squares [3];
+	Sms_Square::Synth square_synth; // used by squares
+	blip_time_t last_time;
+	int         latch;
+	Sms_Noise   noise;
+	unsigned    noise_feedback;
+	unsigned    looped_feedback;
+	
+	void run_until( blip_time_t );
+};
+
+struct sms_apu_state_t
+{
+	unsigned char regs [8] [2];
+	unsigned char latch;
+};
+
+inline void Sms_Apu::output( Blip_Buffer* b ) { output( b, b, b ); }
+
+inline void Sms_Apu::osc_output( int i, Blip_Buffer* b ) { osc_output( i, b, b, b ); }
+
+#endif