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