1 files changed, 66 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Hes_Apu.h b/plugins/gme/game-music-emu-0.6.0/gme/Hes_Apu.h
new file mode 100644
index 00000000..1e546053
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6.0/gme/Hes_Apu.h
@@ -0,0 +1,66 @@
+// Turbo Grafx 16 (PC Engine) PSG sound chip emulator
+
+// Game_Music_Emu 0.5.5
+#ifndef HES_APU_H
+#define HES_APU_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+struct Hes_Osc
+{
+	unsigned char wave [32];
+	short volume [2];
+	int last_amp [2];
+	int delay;
+	int period;
+	unsigned char noise;
+	unsigned char phase;
+	unsigned char balance;
+	unsigned char dac;
+	blip_time_t last_time;
+	
+	Blip_Buffer* outputs [2];
+	Blip_Buffer* chans [3];
+	unsigned noise_lfsr;
+	unsigned char control;
+	
+	enum { amp_range = 0x8000 };
+	typedef Blip_Synth<blip_med_quality,1> synth_t;
+	
+	void run_until( synth_t& synth, blip_time_t );
+};
+
+class Hes_Apu {
+public:
+	void treble_eq( blip_eq_t const& );
+	void volume( double );
+	
+	enum { osc_count = 6 };
+	void osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
+	
+	void reset();
+	
+	enum { start_addr = 0x0800 };
+	enum { end_addr   = 0x0809 };
+	void write_data( blip_time_t, int addr, int data );
+	
+	void end_frame( blip_time_t );
+	
+public:
+	Hes_Apu();
+private:
+	Hes_Osc oscs [osc_count];
+	int latch;
+	int balance;
+	Hes_Osc::synth_t synth;
+	
+	void balance_changed( Hes_Osc& );
+	void recalc_chans();
+};
+
+inline void Hes_Apu::volume( double v ) { synth.volume( 1.8 / osc_count / Hes_Osc::amp_range * v ); }
+
+inline void Hes_Apu::treble_eq( blip_eq_t const& eq ) { synth.treble_eq( eq ); }
+
+#endif