1 files changed, 111 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Kss_Scc_Apu.h b/plugins/gme/game-music-emu-0.6pre/gme/Kss_Scc_Apu.h
new file mode 100644
index 00000000..ee9234a4
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6pre/gme/Kss_Scc_Apu.h
@@ -0,0 +1,111 @@
+// Konami SCC sound chip emulator
+
+// Game_Music_Emu 0.6-pre
+#ifndef KSS_SCC_APU_H
+#define KSS_SCC_APU_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+class Scc_Apu {
+public:
+// Basics
+
+	// Sets buffer to generate sound into, or 0 to mute.
+	void set_output( Blip_Buffer* );
+
+	// Emulates to time t, then writes data to reg
+	enum { reg_count = 0xB0 }; // 0 <= reg < reg_count
+	void write( blip_time_t t, int reg, int data );
+
+	// Emulates to time t, then subtracts t from the current time.
+	// OK if previous write call had time slightly after t.
+	void end_frame( blip_time_t t );
+
+// More features
+
+	// Resets sound chip
+	void reset();
+
+	// Same as set_output(), but for a particular channel
+	enum { osc_count = 5 };
+	void set_output( int chan, Blip_Buffer* );
+
+	// Set overall volume, where 1.0 is normal
+	void volume( double );
+
+	// Set treble equalization
+	void treble_eq( blip_eq_t const& eq )   { synth.treble_eq( eq ); }
+
+private:
+	// noncopyable
+	Scc_Apu( const Scc_Apu& );
+	Scc_Apu& operator = ( const Scc_Apu& );
+
+
+// Implementation
+public:
+	Scc_Apu();
+	BLARGG_DISABLE_NOTHROW
+
+private:
+	enum { amp_range = 0x8000 };
+	struct osc_t
+	{
+		int delay;
+		int phase;
+		int last_amp;
+		Blip_Buffer* output;
+	};
+	osc_t oscs [osc_count];
+	blip_time_t last_time;
+	unsigned char regs [reg_count];
+	Blip_Synth_Fast synth;
+
+	void run_until( blip_time_t );
+};
+
+inline void Scc_Apu::set_output( int index, Blip_Buffer* b )
+{
+	assert( (unsigned) index < osc_count );
+	oscs [index].output = b;
+}
+
+inline void Scc_Apu::write( blip_time_t time, int addr, int data )
+{
+	//assert( (unsigned) addr < reg_count );
+	assert( ( addr >= 0x9800 && addr <= 0x988F ) || ( addr >= 0xB800 && addr <= 0xB8AF ) );
+	run_until( time );
+
+	addr -= 0x9800;
+	if ( ( unsigned ) addr < 0x90 )
+	{
+	    if ( ( unsigned ) addr < 0x60 )
+            regs [addr] = data;
+        else if ( ( unsigned ) addr < 0x80 )
+        {
+            regs [addr] = regs[addr + 0x20] = data;
+        }
+        else if ( ( unsigned ) addr < 0x90 )
+        {
+            regs [addr + 0x20] = data;
+        }
+	}
+	else
+	{
+	    addr -= 0xB800 - 0x9800;
+	    if ( ( unsigned ) addr < 0xB0 )
+            regs [addr] = data;
+	}
+}
+
+inline void Scc_Apu::end_frame( blip_time_t end_time )
+{
+	if ( end_time > last_time )
+		run_until( end_time );
+
+	last_time -= end_time;
+	assert( last_time >= 0 );
+}
+
+#endif