1 files changed, 287 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Snes_Spc.h b/plugins/gme/game-music-emu-0.6.0/gme/Snes_Spc.h
new file mode 100644
index 00000000..188a2c21
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6.0/gme/Snes_Spc.h
@@ -0,0 +1,287 @@
+// SNES SPC-700 APU emulator
+
+// Game_Music_Emu 0.5.5
+#ifndef SNES_SPC_H
+#define SNES_SPC_H
+
+#include "Spc_Dsp.h"
+#include "blargg_endian.h"
+
+struct Snes_Spc {
+public:
+	typedef BOOST::uint8_t uint8_t;
+	
+	// Must be called once before using
+	blargg_err_t init();
+	
+	// Sample pairs generated per second
+	enum { sample_rate = 32000 };
+	
+// Emulator use
+	
+	// Sets IPL ROM data. Library does not include ROM data. Most SPC music files
+	// don't need ROM, but a full emulator must provide this.
+	enum { rom_size = 0x40 };
+	void init_rom( uint8_t const rom [rom_size] );
+
+	// Sets destination for output samples
+	typedef short sample_t;
+	void set_output( sample_t* out, int out_size );
+
+	// Number of samples written to output since last set
+	int sample_count() const;
+
+	// Resets SPC to power-on state. This resets your output buffer, so you must
+	// call set_output() after this.
+	void reset();
+
+	// Emulates pressing reset switch on SNES. This resets your output buffer, so
+	// you must call set_output() after this.
+	void soft_reset();
+
+	// 1024000 SPC clocks per second, sample pair every 32 clocks
+	typedef int time_t;
+	enum { clock_rate = 1024000 };
+	enum { clocks_per_sample = 32 };
+	
+	// Emulated port read/write at specified time
+	enum { port_count = 4 };
+	int  read_port ( time_t, int port );
+	void write_port( time_t, int port, int data );
+
+	// Runs SPC to end_time and starts a new time frame at 0
+	void end_frame( time_t end_time );
+	
+// Sound control
+	
+	// Mutes voices corresponding to non-zero bits in mask (issues repeated KOFF events).
+	// Reduces emulation accuracy.
+	enum { voice_count = 8 };
+	void mute_voices( int mask );
+	
+	// If true, prevents channels and global volumes from being phase-negated.
+	// Only supported by fast DSP.
+	void disable_surround( bool disable = true );
+	
+	// Sets tempo, where tempo_unit = normal, tempo_unit / 2 = half speed, etc.
+	enum { tempo_unit = 0x100 };
+	void set_tempo( int );
+
+// SPC music files
+
+	// Loads SPC data into emulator
+	enum { spc_min_file_size = 0x10180 };
+	enum { spc_file_size     = 0x10200 };
+	blargg_err_t load_spc( void const* in, long size );
+	
+	// Clears echo region. Useful after loading an SPC as many have garbage in echo.
+	void clear_echo();
+
+	// Plays for count samples and write samples to out. Discards samples if out
+	// is NULL. Count must be a multiple of 2 since output is stereo.
+	blargg_err_t play( int count, sample_t* out );
+	
+	// Skips count samples. Several times faster than play() when using fast DSP.
+	blargg_err_t skip( int count );
+	
+// State save/load (only available with accurate DSP)
+
+#if !SPC_NO_COPY_STATE_FUNCS
+	// Saves/loads state
+	enum { state_size = 67 * 1024L }; // maximum space needed when saving
+	typedef Spc_Dsp::copy_func_t copy_func_t;
+	void copy_state( unsigned char** io, copy_func_t );
+	
+	// Writes minimal header to spc_out
+	static void init_header( void* spc_out );
+
+	// Saves emulator state as SPC file data. Writes spc_file_size bytes to spc_out.
+	// Does not set up SPC header; use init_header() for that.
+	void save_spc( void* spc_out );
+
+	// Returns true if new key-on events occurred since last check. Useful for
+	// trimming silence while saving an SPC.
+	bool check_kon();
+#endif
+
+public:
+	// TODO: document
+	struct regs_t
+	{
+		int pc;
+		int a;
+		int x;
+		int y;
+		int psw;
+		int sp;
+	};
+	regs_t& smp_regs() { return m.cpu_regs; }
+	
+	uint8_t* smp_ram() { return m.ram.ram; }
+	
+	void run_until( time_t t ) { run_until_( t ); }
+public:
+	BLARGG_DISABLE_NOTHROW
+	
+	typedef BOOST::uint16_t uint16_t;
+	
+	// Time relative to m_spc_time. Speeds up code a bit by eliminating need to
+	// constantly add m_spc_time to time from CPU. CPU uses time that ends at
+	// 0 to eliminate reloading end time every instruction. It pays off.
+	typedef int rel_time_t;
+	
+	struct Timer
+	{
+		rel_time_t next_time; // time of next event
+		int prescaler;
+		int period;
+		int divider;
+		int enabled;
+		int counter;
+	};
+	enum { reg_count = 0x10 };
+	enum { timer_count = 3 };
+	enum { extra_size = Spc_Dsp::extra_size };
+	
+	enum { signature_size = 35 };
+	
+private:
+	Spc_Dsp dsp;
+	
+	#if SPC_LESS_ACCURATE
+		static signed char const reg_times_ [256];
+		signed char reg_times [256];
+	#endif
+	
+	struct state_t
+	{
+		Timer timers [timer_count];
+		
+		uint8_t smp_regs [2] [reg_count];
+		
+		regs_t cpu_regs;
+		
+		rel_time_t  dsp_time;
+		time_t      spc_time;
+		bool        echo_accessed;
+		
+		int         tempo;
+		int         skipped_kon;
+		int         skipped_koff;
+		const char* cpu_error;
+		
+		int         extra_clocks;
+		sample_t*   buf_begin;
+		sample_t const* buf_end;
+		sample_t*   extra_pos;
+		sample_t    extra_buf [extra_size];
+		
+		int         rom_enabled;
+		uint8_t     rom    [rom_size];
+		uint8_t     hi_ram [rom_size];
+		
+		unsigned char cycle_table [256];
+		
+		struct
+		{
+			// padding to neutralize address overflow
+			union {
+				uint8_t padding1 [0x100];
+				uint16_t align; // makes compiler align data for 16-bit access
+			} padding1 [1];
+			uint8_t ram      [0x10000];
+			uint8_t padding2 [0x100];
+		} ram;
+	};
+	state_t m;
+	
+	enum { rom_addr = 0xFFC0 };
+	
+	enum { skipping_time = 127 };
+	
+	// Value that padding should be filled with
+	enum { cpu_pad_fill = 0xFF };
+	
+	enum {
+        r_test     = 0x0, r_control  = 0x1,
+        r_dspaddr  = 0x2, r_dspdata  = 0x3,
+        r_cpuio0   = 0x4, r_cpuio1   = 0x5,
+        r_cpuio2   = 0x6, r_cpuio3   = 0x7,
+        r_f8       = 0x8, r_f9       = 0x9,
+        r_t0target = 0xA, r_t1target = 0xB, r_t2target = 0xC,
+        r_t0out    = 0xD, r_t1out    = 0xE, r_t2out    = 0xF
+	};
+	
+	void timers_loaded();
+	void enable_rom( int enable );
+	void reset_buf();
+	void save_extra();
+	void load_regs( uint8_t const in [reg_count] );
+	void ram_loaded();
+	void regs_loaded();
+	void reset_time_regs();
+	void reset_common( int timer_counter_init );
+	
+	Timer* run_timer_      ( Timer* t, rel_time_t );
+	Timer* run_timer       ( Timer* t, rel_time_t );
+	int dsp_read           ( rel_time_t );
+	void dsp_write         ( int data, rel_time_t );
+	void cpu_write_smp_reg_( int data, rel_time_t, int addr );
+	void cpu_write_smp_reg ( int data, rel_time_t, int addr );
+	void cpu_write_high    ( int data, int i, rel_time_t );
+	void cpu_write         ( int data, int addr, rel_time_t );
+	int cpu_read_smp_reg   ( int i, rel_time_t );
+	int cpu_read           ( int addr, rel_time_t );
+	unsigned CPU_mem_bit   ( uint8_t const* pc, rel_time_t );
+	
+	bool check_echo_access ( int addr );
+	uint8_t* run_until_( time_t end_time );
+	
+	struct spc_file_t
+	{
+		char    signature [signature_size];
+		uint8_t has_id666;
+		uint8_t version;
+		uint8_t pcl, pch;
+		uint8_t a;
+		uint8_t x;
+		uint8_t y;
+		uint8_t psw;
+		uint8_t sp;
+		char    text [212];
+		uint8_t ram [0x10000];
+		uint8_t dsp [128];
+		uint8_t unused [0x40];
+		uint8_t ipl_rom [0x40];
+	};
+
+	static char const signature [signature_size + 1];
+	
+	void save_regs( uint8_t out [reg_count] );
+};
+
+#include <assert.h>
+
+inline int Snes_Spc::sample_count() const { return (m.extra_clocks >> 5) * 2; }
+
+inline int Snes_Spc::read_port( time_t t, int port )
+{
+	assert( (unsigned) port < port_count );
+	return run_until_( t ) [port];
+}
+
+inline void Snes_Spc::write_port( time_t t, int port, int data )
+{
+	assert( (unsigned) port < port_count );
+	run_until_( t ) [0x10 + port] = data;
+}
+
+inline void Snes_Spc::mute_voices( int mask ) { dsp.mute_voices( mask ); }
+	
+inline void Snes_Spc::disable_surround( bool disable ) { dsp.disable_surround( disable ); }
+
+#if !SPC_NO_COPY_STATE_FUNCS
+inline bool Snes_Spc::check_kon() { return dsp.check_kon(); }
+#endif
+
+#endif