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// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/
#include "Nsf_Emu.h"
#include "blargg_endian.h"
#include <string.h>
#include <stdio.h>
#if !NSF_EMU_APU_ONLY
#include "Nes_Namco_Apu.h"
#include "Nes_Vrc6_Apu.h"
#include "Nes_Fme7_Apu.h"
#endif
/* Copyright (C) 2003-2006 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"
int const vrc6_flag = 0x01;
int const namco_flag = 0x10;
int const fme7_flag = 0x20;
long const clock_divisor = 12;
Nsf_Emu::equalizer_t const Nsf_Emu::nes_eq = { -1.0, 80 };
Nsf_Emu::equalizer_t const Nsf_Emu::famicom_eq = { -15.0, 80 };
int Nsf_Emu::pcm_read( void* emu, nes_addr_t addr )
{
return *((Nsf_Emu*) emu)->cpu::get_code( addr );
}
Nsf_Emu::Nsf_Emu()
{
vrc6 = 0;
namco = 0;
fme7 = 0;
set_type( gme_nsf_type );
set_silence_lookahead( 6 );
apu.dmc_reader( pcm_read, this );
Music_Emu::set_equalizer( nes_eq );
set_gain( 1.4 );
memset( unmapped_code, Nes_Cpu::bad_opcode, sizeof unmapped_code );
}
Nsf_Emu::~Nsf_Emu() { unload(); }
void Nsf_Emu::unload()
{
#if !NSF_EMU_APU_ONLY
{
delete vrc6;
vrc6 = 0;
delete namco;
namco = 0;
delete fme7;
fme7 = 0;
}
#endif
rom.clear();
Music_Emu::unload();
}
// Track info
static void copy_nsf_fields( Nsf_Emu::header_t const& h, track_info_t* out )
{
GME_COPY_FIELD( h, out, game );
GME_COPY_FIELD( h, out, author );
GME_COPY_FIELD( h, out, copyright );
if ( h.chip_flags )
Gme_File::copy_field_( out->system, "Famicom" );
}
blargg_err_t Nsf_Emu::track_info_( track_info_t* out, int ) const
{
copy_nsf_fields( header_, out );
return 0;
}
static blargg_err_t check_nsf_header( void const* header )
{
if ( memcmp( header, "NESM\x1A", 5 ) )
return gme_wrong_file_type;
return 0;
}
struct Nsf_File : Gme_Info_
{
Nsf_Emu::header_t h;
Nsf_File() { set_type( gme_nsf_type ); }
blargg_err_t load_( Data_Reader& in )
{
blargg_err_t err = in.read( &h, Nsf_Emu::header_size );
if ( err )
return (err == in.eof_error ? gme_wrong_file_type : err);
if ( h.chip_flags & ~(namco_flag | vrc6_flag | fme7_flag) )
set_warning( "Uses unsupported audio expansion hardware" );
set_track_count( h.track_count );
return check_nsf_header( &h );
}
blargg_err_t track_info_( track_info_t* out, int ) const
{
copy_nsf_fields( h, out );
return 0;
}
};
static Music_Emu* new_nsf_emu () { return BLARGG_NEW Nsf_Emu ; }
static Music_Emu* new_nsf_file() { return BLARGG_NEW Nsf_File; }
gme_type_t_ const gme_nsf_type [1] = { "Nintendo NES", 0, &new_nsf_emu, &new_nsf_file, "NSF", 1 };
// Setup
void Nsf_Emu::set_tempo_( double t )
{
unsigned playback_rate = get_le16( header_.ntsc_speed );
unsigned standard_rate = 0x411A;
clock_rate_ = 1789772.72727;
play_period = 262 * 341L * 4 - 2; // two fewer PPU clocks every four frames
if ( pal_only )
{
play_period = 33247 * clock_divisor;
clock_rate_ = 1662607.125;
standard_rate = 0x4E20;
playback_rate = get_le16( header_.pal_speed );
}
if ( !playback_rate )
playback_rate = standard_rate;
if ( playback_rate != standard_rate || t != 1.0 )
play_period = long (playback_rate * clock_rate_ / (1000000.0 / clock_divisor * t));
apu.set_tempo( t );
}
blargg_err_t Nsf_Emu::init_sound()
{
if ( header_.chip_flags & ~(namco_flag | vrc6_flag | fme7_flag) )
set_warning( "Uses unsupported audio expansion hardware" );
{
#define APU_NAMES "Square 1", "Square 2", "Triangle", "Noise", "DMC"
int const count = Nes_Apu::osc_count;
static const char* const apu_names [count] = { APU_NAMES };
set_voice_count( count );
set_voice_names( apu_names );
}
static int const types [] = {
wave_type | 1, wave_type | 2, wave_type | 0,
noise_type | 0, mixed_type | 1,
wave_type | 3, wave_type | 4, wave_type | 5,
wave_type | 6, wave_type | 7, wave_type | 8, wave_type | 9,
wave_type |10, wave_type |11, wave_type |12, wave_type |13
};
set_voice_types( types ); // common to all sound chip configurations
double adjusted_gain = gain();
#if NSF_EMU_APU_ONLY
{
if ( header_.chip_flags )
set_warning( "Uses unsupported audio expansion hardware" );
}
#else
{
if ( header_.chip_flags & (namco_flag | vrc6_flag | fme7_flag) )
set_voice_count( Nes_Apu::osc_count + 3 );
if ( header_.chip_flags & namco_flag )
{
namco = BLARGG_NEW Nes_Namco_Apu;
CHECK_ALLOC( namco );
adjusted_gain *= 0.75;
int const count = Nes_Apu::osc_count + Nes_Namco_Apu::osc_count;
static const char* const names [count] = {
APU_NAMES,
"Wave 1", "Wave 2", "Wave 3", "Wave 4",
"Wave 5", "Wave 6", "Wave 7", "Wave 8"
};
set_voice_count( count );
set_voice_names( names );
}
if ( header_.chip_flags & vrc6_flag )
{
vrc6 = BLARGG_NEW Nes_Vrc6_Apu;
CHECK_ALLOC( vrc6 );
adjusted_gain *= 0.75;
{
int const count = Nes_Apu::osc_count + Nes_Vrc6_Apu::osc_count;
static const char* const names [count] = {
APU_NAMES,
"Saw Wave", "Square 3", "Square 4"
};
set_voice_count( count );
set_voice_names( names );
}
if ( header_.chip_flags & namco_flag )
{
int const count = Nes_Apu::osc_count + Nes_Vrc6_Apu::osc_count +
Nes_Namco_Apu::osc_count;
static const char* const names [count] = {
APU_NAMES,
"Saw Wave", "Square 3", "Square 4",
"Wave 1", "Wave 2", "Wave 3", "Wave 4",
"Wave 5", "Wave 6", "Wave 7", "Wave 8"
};
set_voice_count( count );
set_voice_names( names );
}
}
if ( header_.chip_flags & fme7_flag )
{
fme7 = BLARGG_NEW Nes_Fme7_Apu;
CHECK_ALLOC( fme7 );
adjusted_gain *= 0.75;
int const count = Nes_Apu::osc_count + Nes_Fme7_Apu::osc_count;
static const char* const names [count] = {
APU_NAMES,
"Square 3", "Square 4", "Square 5"
};
set_voice_count( count );
set_voice_names( names );
}
if ( namco ) namco->volume( adjusted_gain );
if ( vrc6 ) vrc6 ->volume( adjusted_gain );
if ( fme7 ) fme7 ->volume( adjusted_gain );
}
#endif
apu.volume( adjusted_gain );
return 0;
}
blargg_err_t Nsf_Emu::load_( Data_Reader& in )
{
assert( offsetof (header_t,unused [4]) == header_size );
RETURN_ERR( rom.load( in, header_size, &header_, 0 ) );
set_track_count( header_.track_count );
RETURN_ERR( check_nsf_header( &header_ ) );
if ( header_.vers != 1 )
set_warning( "Unknown file version" );
// sound and memory
blargg_err_t err = init_sound();
if ( err )
return err;
// set up data
nes_addr_t load_addr = get_le16( header_.load_addr );
init_addr = get_le16( header_.init_addr );
play_addr = get_le16( header_.play_addr );
if ( !load_addr ) load_addr = rom_begin;
if ( !init_addr ) init_addr = rom_begin;
if ( !play_addr ) play_addr = rom_begin;
if ( load_addr < rom_begin || init_addr < rom_begin )
{
const char* w = warning();
if ( !w )
w = "Corrupt file (invalid load/init/play address)";
return w;
}
rom.set_addr( load_addr % bank_size );
int total_banks = rom.size() / bank_size;
// bank switching
int first_bank = (load_addr - rom_begin) / bank_size;
for ( int i = 0; i < bank_count; i++ )
{
unsigned bank = i - first_bank;
if ( bank >= (unsigned) total_banks )
bank = 0;
initial_banks [i] = bank;
if ( header_.banks [i] )
{
// bank-switched
memcpy( initial_banks, header_.banks, sizeof initial_banks );
break;
}
}
pal_only = (header_.speed_flags & 3) == 1;
#if !NSF_EMU_EXTRA_FLAGS
header_.speed_flags = 0;
#endif
set_tempo( tempo() );
return setup_buffer( (long) (clock_rate_ + 0.5) );
}
void Nsf_Emu::update_eq( blip_eq_t const& eq )
{
apu.treble_eq( eq );
#if !NSF_EMU_APU_ONLY
{
if ( namco ) namco->treble_eq( eq );
if ( vrc6 ) vrc6 ->treble_eq( eq );
if ( fme7 ) fme7 ->treble_eq( eq );
}
#endif
}
void Nsf_Emu::set_voice( int i, Blip_Buffer* buf, Blip_Buffer*, Blip_Buffer* )
{
if ( i < Nes_Apu::osc_count )
{
apu.osc_output( i, buf );
return;
}
i -= Nes_Apu::osc_count;
#if !NSF_EMU_APU_ONLY
{
if ( fme7 && i < Nes_Fme7_Apu::osc_count )
{
fme7->osc_output( i, buf );
return;
}
if ( vrc6 )
{
if ( i < Nes_Vrc6_Apu::osc_count )
{
// put saw first
if ( --i < 0 )
i = 2;
vrc6->osc_output( i, buf );
return;
}
i -= Nes_Vrc6_Apu::osc_count;
}
if ( namco && i < Nes_Namco_Apu::osc_count )
{
namco->osc_output( i, buf );
return;
}
}
#endif
}
// Emulation
// see nes_cpu_io.h for read/write functions
void Nsf_Emu::cpu_write_misc( nes_addr_t addr, int data )
{
#if !NSF_EMU_APU_ONLY
{
if ( namco )
{
switch ( addr )
{
case Nes_Namco_Apu::data_reg_addr:
namco->write_data( time(), data );
return;
case Nes_Namco_Apu::addr_reg_addr:
namco->write_addr( data );
return;
}
}
if ( addr >= Nes_Fme7_Apu::latch_addr && fme7 )
{
switch ( addr & Nes_Fme7_Apu::addr_mask )
{
case Nes_Fme7_Apu::latch_addr:
fme7->write_latch( data );
return;
case Nes_Fme7_Apu::data_addr:
fme7->write_data( time(), data );
return;
}
}
if ( vrc6 )
{
unsigned reg = addr & (Nes_Vrc6_Apu::addr_step - 1);
unsigned osc = unsigned (addr - Nes_Vrc6_Apu::base_addr) / Nes_Vrc6_Apu::addr_step;
if ( osc < Nes_Vrc6_Apu::osc_count && reg < Nes_Vrc6_Apu::reg_count )
{
vrc6->write_osc( time(), osc, reg, data );
return;
}
}
}
#endif
// unmapped write
#ifndef NDEBUG
{
// some games write to $8000 and $8001 repeatedly
if ( addr == 0x8000 || addr == 0x8001 ) return;
// probably namco sound mistakenly turned on in mck
if ( addr == 0x4800 || addr == 0xF800 ) return;
// memory mapper?
if ( addr == 0xFFF8 ) return;
dprintf( "write_unmapped( 0x%04X, 0x%02X )\n", (unsigned) addr, (unsigned) data );
}
#endif
}
blargg_err_t Nsf_Emu::start_track_( int track )
{
RETURN_ERR( Classic_Emu::start_track_( track ) );
memset( low_mem, 0, sizeof low_mem );
memset( sram, 0, sizeof sram );
cpu::reset( unmapped_code ); // also maps low_mem
cpu::map_code( sram_addr, sizeof sram, sram );
for ( int i = 0; i < bank_count; ++i )
cpu_write( bank_select_addr + i, initial_banks [i] );
apu.reset( pal_only, (header_.speed_flags & 0x20) ? 0x3F : 0 );
apu.write_register( 0, 0x4015, 0x0F );
apu.write_register( 0, 0x4017, (header_.speed_flags & 0x10) ? 0x80 : 0 );
#if !NSF_EMU_APU_ONLY
{
if ( namco ) namco->reset();
if ( vrc6 ) vrc6 ->reset();
if ( fme7 ) fme7 ->reset();
}
#endif
play_ready = 4;
play_extra = 0;
next_play = play_period / clock_divisor;
saved_state.pc = badop_addr;
low_mem [0x1FF] = (badop_addr - 1) >> 8;
low_mem [0x1FE] = (badop_addr - 1) & 0xFF;
r.sp = 0xFD;
r.pc = init_addr;
r.a = track;
r.x = pal_only;
return 0;
}
blargg_err_t Nsf_Emu::run_clocks( blip_time_t& duration, int )
{
set_time( 0 );
while ( time() < duration )
{
nes_time_t end = min( next_play, duration );
end = min( end, time() + 32767 ); // allows CPU to use 16-bit time delta
if ( cpu::run( end ) )
{
if ( r.pc != badop_addr )
{
set_warning( "Emulation error (illegal instruction)" );
r.pc++;
}
else
{
play_ready = 1;
if ( saved_state.pc != badop_addr )
{
cpu::r = saved_state;
saved_state.pc = badop_addr;
}
else
{
set_time( end );
}
}
}
if ( time() >= next_play )
{
nes_time_t period = (play_period + play_extra) / clock_divisor;
play_extra = play_period - period * clock_divisor;
next_play += period;
if ( play_ready && !--play_ready )
{
check( saved_state.pc == badop_addr );
if ( r.pc != badop_addr )
saved_state = cpu::r;
r.pc = play_addr;
low_mem [0x100 + r.sp--] = (badop_addr - 1) >> 8;
low_mem [0x100 + r.sp--] = (badop_addr - 1) & 0xFF;
GME_FRAME_HOOK( this );
}
}
}
if ( cpu::error_count() )
{
cpu::clear_error_count();
set_warning( "Emulation error (illegal instruction)" );
}
duration = time();
next_play -= duration;
check( next_play >= 0 );
if ( next_play < 0 )
next_play = 0;
apu.end_frame( duration );
#if !NSF_EMU_APU_ONLY
{
if ( namco ) namco->end_frame( duration );
if ( vrc6 ) vrc6 ->end_frame( duration );
if ( fme7 ) fme7 ->end_frame( duration );
}
#endif
return 0;
}
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