From 55cba1db948c3d6650a0d4162ffcd09ca73fe3a1 Mon Sep 17 00:00:00 2001
From: waker <wakeroid@gmail.com>
Date: Mon, 6 Jul 2009 22:43:23 +0200
Subject: added GME support ; added subtune support

---
 gme/Nes_Oscs.h | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 gme/Nes_Oscs.h

(limited to 'gme/Nes_Oscs.h')

diff --git a/gme/Nes_Oscs.h b/gme/Nes_Oscs.h
new file mode 100644
index 00000000..b675bfb4
--- /dev/null
+++ b/gme/Nes_Oscs.h
@@ -0,0 +1,147 @@
+// Private oscillators used by Nes_Apu
+
+// Nes_Snd_Emu 0.1.8
+#ifndef NES_OSCS_H
+#define NES_OSCS_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+class Nes_Apu;
+
+struct Nes_Osc
+{
+	unsigned char regs [4];
+	bool reg_written [4];
+	Blip_Buffer* output;
+	int length_counter;// length counter (0 if unused by oscillator)
+	int delay;      // delay until next (potential) transition
+	int last_amp;   // last amplitude oscillator was outputting
+	
+	void clock_length( int halt_mask );
+	int period() const {
+		return (regs [3] & 7) * 0x100 + (regs [2] & 0xFF);
+	}
+	void reset() {
+		delay = 0;
+		last_amp = 0;
+	}
+	int update_amp( int amp ) {
+		int delta = amp - last_amp;
+		last_amp = amp;
+		return delta;
+	}
+};
+
+struct Nes_Envelope : Nes_Osc
+{
+	int envelope;
+	int env_delay;
+	
+	void clock_envelope();
+	int volume() const;
+	void reset() {
+		envelope = 0;
+		env_delay = 0;
+		Nes_Osc::reset();
+	}
+};
+
+// Nes_Square
+struct Nes_Square : Nes_Envelope
+{
+	enum { negate_flag = 0x08 };
+	enum { shift_mask = 0x07 };
+	enum { phase_range = 8 };
+	int phase;
+	int sweep_delay;
+	
+	typedef Blip_Synth<blip_good_quality,1> Synth;
+	Synth const& synth; // shared between squares
+	
+	Nes_Square( Synth const* s ) : synth( *s ) { }
+	
+	void clock_sweep( int adjust );
+	void run( nes_time_t, nes_time_t );
+	void reset() {
+		sweep_delay = 0;
+		Nes_Envelope::reset();
+	}
+	nes_time_t maintain_phase( nes_time_t time, nes_time_t end_time,
+			nes_time_t timer_period );
+};
+
+// Nes_Triangle
+struct Nes_Triangle : Nes_Osc
+{
+	enum { phase_range = 16 };
+	int phase;
+	int linear_counter;
+	Blip_Synth<blip_med_quality,1> synth;
+	
+	int calc_amp() const;
+	void run( nes_time_t, nes_time_t );
+	void clock_linear_counter();
+	void reset() {
+		linear_counter = 0;
+		phase = 1;
+		Nes_Osc::reset();
+	}
+	nes_time_t maintain_phase( nes_time_t time, nes_time_t end_time,
+			nes_time_t timer_period );
+};
+
+// Nes_Noise
+struct Nes_Noise : Nes_Envelope
+{
+	int noise;
+	Blip_Synth<blip_med_quality,1> synth;
+	
+	void run( nes_time_t, nes_time_t );
+	void reset() {
+		noise = 1 << 14;
+		Nes_Envelope::reset();
+	}
+};
+
+// Nes_Dmc
+struct Nes_Dmc : Nes_Osc
+{
+	int address;    // address of next byte to read
+	int period;
+	//int length_counter; // bytes remaining to play (already defined in Nes_Osc)
+	int buf;
+	int bits_remain;
+	int bits;
+	bool buf_full;
+	bool silence;
+	
+	enum { loop_flag = 0x40 };
+	
+	int dac;
+	
+	nes_time_t next_irq;
+	bool irq_enabled;
+	bool irq_flag;
+	bool pal_mode;
+	bool nonlinear;
+	
+	int (*prg_reader)( void*, nes_addr_t ); // needs to be initialized to prg read function
+	void* prg_reader_data;
+	
+	Nes_Apu* apu;
+	
+	Blip_Synth<blip_med_quality,1> synth;
+	
+	void start();
+	void write_register( int, int );
+	void run( nes_time_t, nes_time_t );
+	void recalc_irq();
+	void fill_buffer();
+	void reload_sample();
+	void reset();
+	int count_reads( nes_time_t, nes_time_t* ) const;
+	nes_time_t next_read_time() const;
+};
+
+#endif
-- 
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