1 files changed, 442 insertions, 0 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Sap_Emu.cpp b/plugins/gme/Game_Music_Emu-0.5.2/gme/Sap_Emu.cpp
new file mode 100644
index 00000000..8314fd6e
--- /dev/null
+++ b/plugins/gme/Game_Music_Emu-0.5.2/gme/Sap_Emu.cpp
@@ -0,0 +1,442 @@
+// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/
+
+#include "Sap_Emu.h"
+
+#include "blargg_endian.h"
+#include <string.h>
+
+/* Copyright (C) 2006 Shay Green. This module is free software; you
+can redistribute it and/or modify it under the terms of the GNU Lesser
+General Public License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version. This
+module is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+details. You should have received a copy of the GNU Lesser General Public
+License along with this module; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
+
+#include "blargg_source.h"
+
+long const base_scanline_period = 114;
+
+Sap_Emu::Sap_Emu()
+{
+	set_type( gme_sap_type );
+	
+	static const char* const names [Sap_Apu::osc_count * 2] = {
+		"Wave 1", "Wave 2", "Wave 3", "Wave 4",
+		"Wave 5", "Wave 6", "Wave 7", "Wave 8",
+	};
+	set_voice_names( names );
+	
+	static int const types [Sap_Apu::osc_count * 2] = {
+		wave_type | 1, wave_type | 2, wave_type | 3, wave_type | 0,
+		wave_type | 5, wave_type | 6, wave_type | 7, wave_type | 4,
+	};
+	set_voice_types( types );
+	set_silence_lookahead( 6 );
+}
+
+Sap_Emu::~Sap_Emu() { }
+
+// Track info
+
+// Returns 16 or greater if not hex
+inline int from_hex_char( int h )
+{
+	h -= 0x30;
+	if ( (unsigned) h > 9 )
+		h = ((h - 0x11) & 0xDF) + 10;
+	return h;
+}
+
+static long from_hex( byte const* in )
+{
+	unsigned result = 0;
+	for ( int n = 4; n--; )
+	{
+		int h = from_hex_char( *in++ );
+		if ( h > 15 )
+			return -1;
+		result = result * 0x10 + h;
+	}
+	return result;
+}
+
+static int from_dec( byte const* in, byte const* end )
+{
+	if ( in >= end )
+		return -1;
+	
+	int n = 0;
+	while ( in < end )
+	{
+		int dig = *in++ - '0';
+		if ( (unsigned) dig > 9 )
+			return -1;
+		n = n * 10 + dig;
+	}
+	return n;
+}
+
+static void parse_string( byte const* in, byte const* end, int len, char* out )
+{
+	byte const* start = in;
+	if ( *in++ == '\"' )
+	{
+		start++;
+		while ( in < end && *in != '\"' )
+			in++;
+	}
+	else
+	{
+		in = end;
+	}
+	len = min( len - 1, int (in - start) );
+	out [len] = 0;
+	memcpy( out, start, len );
+}
+
+static blargg_err_t parse_info( byte const* in, long size, Sap_Emu::info_t* out )
+{
+	out->track_count   = 1;
+	out->author    [0] = 0;
+	out->name      [0] = 0;
+	out->copyright [0] = 0;
+	
+	if ( size < 16 || memcmp( in, "SAP\x0D\x0A", 5 ) )
+		return gme_wrong_file_type;
+	
+	byte const* file_end = in + size - 5;
+	in += 5;
+	while ( in < file_end && (in [0] != 0xFF || in [1] != 0xFF) )
+	{
+		byte const* line_end = in;
+		while ( line_end < file_end && *line_end != 0x0D )
+			line_end++;
+		
+		char const* tag = (char const*) in;
+		while ( in < line_end && *in > ' ' )
+			in++;
+		int tag_len = (char const*) in - tag;
+		
+		while ( in < line_end && *in <= ' ' ) in++;
+		
+		if ( tag_len <= 0 )
+		{
+			// skip line
+		}
+		else if ( !strncmp( "INIT", tag, tag_len ) )
+		{
+			out->init_addr = from_hex( in );
+			if ( (unsigned long) out->init_addr > 0xFFFF )
+				return "Invalid init address";
+		}
+		else if ( !strncmp( "PLAYER", tag, tag_len ) )
+		{
+			out->play_addr = from_hex( in );
+			if ( (unsigned long) out->play_addr > 0xFFFF )
+				return "Invalid play address";
+		}
+		else if ( !strncmp( "MUSIC", tag, tag_len ) )
+		{
+			out->music_addr = from_hex( in );
+			if ( (unsigned long) out->music_addr > 0xFFFF )
+				return "Invalid music address";
+		}
+		else if ( !strncmp( "SONGS", tag, tag_len ) )
+		{
+			out->track_count = from_dec( in, line_end );
+			if ( out->track_count <= 0 )
+				return "Invalid track count";
+		}
+		else if ( !strncmp( "TYPE", tag, tag_len ) )
+		{
+			switch ( out->type = *in )
+			{
+			case 'C':
+			case 'B':
+				break;
+			
+			case 'D':
+				return "Digimusic not supported";
+			
+			default:
+				return "Unsupported player type";
+			}
+		}
+		else if ( !strncmp( "STEREO", tag, tag_len ) )
+		{
+			out->stereo = true;
+		}
+		else if ( !strncmp( "FASTPLAY", tag, tag_len ) )
+		{
+			out->fastplay = from_dec( in, line_end );
+			if ( out->fastplay <= 0 )
+				return "Invalid fastplay value";
+		}
+		else if ( !strncmp( "AUTHOR", tag, tag_len ) )
+		{
+			parse_string( in, line_end, sizeof out->author, out->author );
+		}
+		else if ( !strncmp( "NAME", tag, tag_len ) )
+		{
+			parse_string( in, line_end, sizeof out->name, out->name );
+		}
+		else if ( !strncmp( "DATE", tag, tag_len ) )
+		{
+			parse_string( in, line_end, sizeof out->copyright, out->copyright );
+		}
+		
+		in = line_end + 2;
+	}
+	
+	if ( in [0] != 0xFF || in [1] != 0xFF )
+		return "ROM data missing";
+	out->rom_data = in + 2;
+	
+	return 0;
+}
+
+static void copy_sap_fields( Sap_Emu::info_t const& in, track_info_t* out )
+{
+	Gme_File::copy_field_( out->game,      in.name );
+	Gme_File::copy_field_( out->author,    in.author );
+	Gme_File::copy_field_( out->copyright, in.copyright );
+}
+
+blargg_err_t Sap_Emu::track_info_( track_info_t* out, int ) const
+{
+	copy_sap_fields( info, out );
+	return 0;
+}
+
+struct Sap_File : Gme_Info_
+{
+	Sap_Emu::info_t info;
+	
+	Sap_File() { set_type( gme_sap_type ); }
+	
+	blargg_err_t load_mem_( byte const* begin, long size )
+	{
+		RETURN_ERR( parse_info( begin, size, &info ) );
+		set_track_count( info.track_count );
+		return 0;
+	}
+	
+	blargg_err_t track_info_( track_info_t* out, int ) const
+	{
+		copy_sap_fields( info, out );
+		return 0;
+	}
+};
+
+static Music_Emu* new_sap_emu () { return BLARGG_NEW Sap_Emu ; }
+static Music_Emu* new_sap_file() { return BLARGG_NEW Sap_File; }
+
+gme_type_t_ const gme_sap_type [1] = { "Atari XL", 0, &new_sap_emu, &new_sap_file, "SAP", 1 };
+
+// Setup
+
+blargg_err_t Sap_Emu::load_mem_( byte const* in, long size )
+{
+	file_end = in + size;
+	
+	info.warning    = 0;
+	info.type       = 'B';
+	info.stereo     = false;
+	info.init_addr  = -1;
+	info.play_addr  = -1;
+	info.music_addr = -1;
+	info.fastplay   = 312;
+	RETURN_ERR( parse_info( in, size, &info ) );
+	
+	set_warning( info.warning );
+	set_track_count( info.track_count );
+	set_voice_count( Sap_Apu::osc_count << info.stereo );
+	apu_impl.volume( gain() );
+	
+	return setup_buffer( 1773447 );
+}
+
+void Sap_Emu::update_eq( blip_eq_t const& eq )
+{
+	apu_impl.synth.treble_eq( eq );
+}
+
+void Sap_Emu::set_voice( int i, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right )
+{
+	int i2 = i - Sap_Apu::osc_count;
+	if ( i2 >= 0 )
+		apu2.osc_output( i2, right );
+	else
+		apu.osc_output( i, (info.stereo ? left : center) );
+}
+
+// Emulation
+
+void Sap_Emu::set_tempo_( double t )
+{
+	scanline_period = sap_time_t (base_scanline_period / t);
+}
+
+inline sap_time_t Sap_Emu::play_period() const { return info.fastplay * scanline_period; }
+
+void Sap_Emu::cpu_jsr( sap_addr_t addr )
+{
+	check( r.sp >= 0xFE ); // catch anything trying to leave data on stack
+	r.pc = addr;
+	int high_byte = (idle_addr - 1) >> 8;
+	if ( r.sp == 0xFE && mem.ram [0x1FF] == high_byte )
+		r.sp = 0xFF; // pop extra byte off
+	mem.ram [0x100 + r.sp--] = high_byte; // some routines use RTI to return
+	mem.ram [0x100 + r.sp--] = high_byte;
+	mem.ram [0x100 + r.sp--] = (idle_addr - 1) & 0xFF;
+}
+
+void Sap_Emu::run_routine( sap_addr_t addr )
+{
+	cpu_jsr( addr );
+	cpu::run( 312 * base_scanline_period * 60 );
+	check( r.pc == idle_addr );
+}
+
+inline void Sap_Emu::call_init( int track )
+{
+	switch ( info.type )
+	{
+	case 'B':
+		r.a = track;
+		run_routine( info.init_addr );
+		break;
+	
+	case 'C':
+		r.a = 0x70;
+		r.x = info.music_addr&0xFF;
+		r.y = info.music_addr >> 8;
+		run_routine( info.play_addr + 3 );
+		r.a = 0;
+		r.x = track;
+		run_routine( info.play_addr + 3 );
+		break;
+	}
+}
+
+blargg_err_t Sap_Emu::start_track_( int track )
+{
+	RETURN_ERR( Classic_Emu::start_track_( track ) );
+	
+	memset( &mem, 0, sizeof mem );
+
+	byte const* in = info.rom_data;
+	while ( file_end - in >= 5 )
+	{
+		unsigned start = get_le16( in );
+		unsigned end   = get_le16( in + 2 );
+		//dprintf( "Block $%04X-$%04X\n", start, end );
+		in += 4;
+		if ( end < start )
+		{
+			set_warning( "Invalid file data block" );
+			break;
+		}
+		long len = end - start + 1;
+		if ( len > file_end - in )
+		{
+			set_warning( "Invalid file data block" );
+			break;
+		}
+		
+		memcpy( mem.ram + start, in, len );
+		in += len;
+		if ( file_end - in >= 2 && in [0] == 0xFF && in [1] == 0xFF )
+			in += 2;
+	}
+	
+	apu.reset( &apu_impl );
+	apu2.reset( &apu_impl );
+	cpu::reset( mem.ram );
+	time_mask = 0; // disables sound during init
+	call_init( track );
+	time_mask = -1;
+	
+	next_play = play_period();
+	
+	return 0;
+}
+
+// Emulation
+
+// see sap_cpu_io.h for read/write functions
+
+void Sap_Emu::cpu_write_( sap_addr_t addr, int data )
+{
+	if ( (addr ^ Sap_Apu::start_addr) <= (Sap_Apu::end_addr - Sap_Apu::start_addr) )
+	{
+		GME_APU_HOOK( this, addr - Sap_Apu::start_addr, data );
+		apu.write_data( time() & time_mask, addr, data );
+		return;
+	}
+	
+	if ( (addr ^ (Sap_Apu::start_addr + 0x10)) <= (Sap_Apu::end_addr - Sap_Apu::start_addr) &&
+			info.stereo )
+	{
+		GME_APU_HOOK( this, addr - 0x10 - Sap_Apu::start_addr + 10, data );
+		apu2.write_data( time() & time_mask, addr ^ 0x10, data );
+		return;
+	}
+
+	if ( (addr & ~0x0010) != 0xD20F || data != 0x03 )
+		dprintf( "Unmapped write $%04X <- $%02X\n", addr, data );
+}
+
+inline void Sap_Emu::call_play()
+{
+	switch ( info.type )
+	{
+	case 'B':
+		cpu_jsr( info.play_addr );
+		break;
+	
+	case 'C':
+		cpu_jsr( info.play_addr + 6 );
+		break;
+	}
+}
+
+blargg_err_t Sap_Emu::run_clocks( blip_time_t& duration, int )
+{
+	set_time( 0 );
+	while ( time() < duration )
+	{
+		if ( cpu::run( duration ) || r.pc > idle_addr )
+			return "Emulation error (illegal instruction)";
+		
+		if ( r.pc == idle_addr )
+		{
+			if ( next_play <= duration )
+			{
+				set_time( next_play );
+				next_play += play_period();
+				call_play();
+				GME_FRAME_HOOK( this );
+			}
+			else
+			{
+				set_time( duration );
+			}
+		}
+	}
+	
+	duration = time();
+	next_play -= duration;
+	check( next_play >= 0 );
+	if ( next_play < 0 )
+		next_play = 0;
+	apu.end_frame( duration );
+	if ( info.stereo )
+		apu2.end_frame( duration );
+	
+	return 0;
+}