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gzdoom/game-music-emu/gme/Sap_Emu.cpp

444 lines
9.9 KiB
C++

// Game_Music_Emu 0.6.0. 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 = int((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; }
static gme_type_t_ const gme_sap_type_ = { "Atari XL", 0, &new_sap_emu, &new_sap_file, "SAP", 1 };
gme_type_t const gme_sap_type = &gme_sap_type_;
// 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 << (int)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 = (BOOST::uint8_t)(info.music_addr&0xFF);
r.y = (BOOST::uint8_t)(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 );
//debug_printf( "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 )
debug_printf( "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;
}