1 files changed, 77 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Sap_Apu.h b/plugins/gme/game-music-emu-0.6.0/gme/Sap_Apu.h
new file mode 100644
index 00000000..a573499c
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6.0/gme/Sap_Apu.h
@@ -0,0 +1,77 @@
+// Atari POKEY sound chip emulator
+
+// Game_Music_Emu 0.5.5
+#ifndef SAP_APU_H
+#define SAP_APU_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+class Sap_Apu_Impl;
+
+class Sap_Apu {
+public:
+	enum { osc_count = 4 };
+	void osc_output( int index, Blip_Buffer* );
+	
+	void reset( Sap_Apu_Impl* );
+	
+	enum { start_addr = 0xD200 };
+	enum { end_addr   = 0xD209 };
+	void write_data( blip_time_t, unsigned addr, int data );
+	
+	void end_frame( blip_time_t );
+	
+public:
+	Sap_Apu();
+private:
+	struct osc_t
+	{
+		unsigned char regs [2];
+		unsigned char phase;
+		unsigned char invert;
+		int last_amp;
+		blip_time_t delay;
+		blip_time_t period; // always recalculated before use; here for convenience
+		Blip_Buffer* output;
+	};
+	osc_t oscs [osc_count];
+	Sap_Apu_Impl* impl;
+	blip_time_t last_time;
+	int poly5_pos;
+	int poly4_pos;
+	int polym_pos;
+	int control;
+	
+	void calc_periods();
+	void run_until( blip_time_t );
+	
+	enum { poly4_len  = (1L <<  4) - 1 };
+	enum { poly9_len  = (1L <<  9) - 1 };
+	enum { poly17_len = (1L << 17) - 1 };
+	friend class Sap_Apu_Impl;
+};
+
+// Common tables and Blip_Synth that can be shared among multiple Sap_Apu objects
+class Sap_Apu_Impl {
+public:
+	Blip_Synth<blip_good_quality,1> synth;
+	
+	Sap_Apu_Impl();
+	void volume( double d ) { synth.volume( 1.0 / Sap_Apu::osc_count / 30 * d ); }
+	
+private:
+	typedef unsigned char byte;
+	byte poly4  [Sap_Apu::poly4_len  / 8 + 1];
+	byte poly9  [Sap_Apu::poly9_len  / 8 + 1];
+	byte poly17 [Sap_Apu::poly17_len / 8 + 1];
+	friend class Sap_Apu;
+};
+
+inline void Sap_Apu::osc_output( int i, Blip_Buffer* b )
+{
+	assert( (unsigned) i < osc_count );
+	oscs [i].output = b;
+}
+
+#endif