1 files changed, 83 insertions, 0 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Oscs.h b/plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Oscs.h
new file mode 100644
index 00000000..d7f88ea1
--- /dev/null
+++ b/plugins/gme/Game_Music_Emu-0.5.2/gme/Gb_Oscs.h
@@ -0,0 +1,83 @@
+// Private oscillators used by Gb_Apu
+
+// Gb_Snd_Emu 0.1.5
+#ifndef GB_OSCS_H
+#define GB_OSCS_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+struct Gb_Osc
+{
+	enum { trigger = 0x80 };
+	enum { len_enabled_mask = 0x40 };
+	
+	Blip_Buffer* outputs [4]; // NULL, right, left, center
+	Blip_Buffer* output;
+	int output_select;
+	BOOST::uint8_t* regs; // osc's 5 registers
+	
+	int delay;
+	int last_amp;
+	int volume;
+	int length;
+	int enabled;
+	
+	void reset();
+	void clock_length();
+	int frequency() const { return (regs [4] & 7) * 0x100 + regs [3]; }
+};
+
+struct Gb_Env : Gb_Osc
+{
+	int env_delay;
+	
+	void reset();
+	void clock_envelope();
+	bool write_register( int, int );
+};
+
+struct Gb_Square : Gb_Env
+{
+	enum { period_mask = 0x70 };
+	enum { shift_mask  = 0x07 };
+	
+	typedef Blip_Synth<blip_good_quality,1> Synth;
+	Synth const* synth;
+	int sweep_delay;
+	int sweep_freq;
+	int phase;
+	
+	void reset();
+	void clock_sweep();
+	void run( blip_time_t, blip_time_t, int playing );
+};
+
+struct Gb_Noise : Gb_Env
+{
+	typedef Blip_Synth<blip_med_quality,1> Synth;
+	Synth const* synth;
+	unsigned bits;
+	
+	void run( blip_time_t, blip_time_t, int playing );
+};
+
+struct Gb_Wave : Gb_Osc
+{
+	typedef Blip_Synth<blip_med_quality,1> Synth;
+	Synth const* synth;
+	int wave_pos;
+	enum { wave_size = 32 };
+	BOOST::uint8_t wave [wave_size];
+	
+	void write_register( int, int );
+	void run( blip_time_t, blip_time_t, int playing );
+};
+
+inline void Gb_Env::reset()
+{
+	env_delay = 0;
+	Gb_Osc::reset();
+}
+
+#endif