diff options
Diffstat (limited to 'plugins/gme/Game_Music_Emu-0.5.2/gme/Kss_Emu.cpp')
-rw-r--r-- | plugins/gme/Game_Music_Emu-0.5.2/gme/Kss_Emu.cpp | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Kss_Emu.cpp b/plugins/gme/Game_Music_Emu-0.5.2/gme/Kss_Emu.cpp new file mode 100644 index 00000000..1b26ef0b --- /dev/null +++ b/plugins/gme/Game_Music_Emu-0.5.2/gme/Kss_Emu.cpp @@ -0,0 +1,414 @@ +// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ + +#include "Kss_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 clock_rate = 3579545; +int const osc_count = Ay_Apu::osc_count + Scc_Apu::osc_count; + +Kss_Emu::Kss_Emu() +{ + sn = 0; + set_type( gme_kss_type ); + set_silence_lookahead( 6 ); + static const char* const names [osc_count] = { + "Square 1", "Square 2", "Square 3", + "Wave 1", "Wave 2", "Wave 3", "Wave 4", "Wave 5" + }; + set_voice_names( names ); + + static int const types [osc_count] = { + wave_type | 0, wave_type | 1, wave_type | 2, + wave_type | 3, wave_type | 4, wave_type | 5, wave_type | 6, wave_type | 7 + }; + set_voice_types( types ); + + memset( unmapped_read, 0xFF, sizeof unmapped_read ); +} + +Kss_Emu::~Kss_Emu() { unload(); } + +void Kss_Emu::unload() +{ + delete sn; + sn = 0; + Classic_Emu::unload(); +} + +// Track info + +static void copy_kss_fields( Kss_Emu::header_t const& h, track_info_t* out ) +{ + const char* system = "MSX"; + if ( h.device_flags & 0x02 ) + { + system = "Sega Master System"; + if ( h.device_flags & 0x04 ) + system = "Game Gear"; + } + Gme_File::copy_field_( out->system, system ); +} + +blargg_err_t Kss_Emu::track_info_( track_info_t* out, int ) const +{ + copy_kss_fields( header_, out ); + return 0; +} + +static blargg_err_t check_kss_header( void const* header ) +{ + if ( memcmp( header, "KSCC", 4 ) && memcmp( header, "KSSX", 4 ) ) + return gme_wrong_file_type; + return 0; +} + +struct Kss_File : Gme_Info_ +{ + Kss_Emu::header_t header_; + + Kss_File() { set_type( gme_kss_type ); } + + blargg_err_t load_( Data_Reader& in ) + { + blargg_err_t err = in.read( &header_, Kss_Emu::header_size ); + if ( err ) + return (err == in.eof_error ? gme_wrong_file_type : err); + return check_kss_header( &header_ ); + } + + blargg_err_t track_info_( track_info_t* out, int ) const + { + copy_kss_fields( header_, out ); + return 0; + } +}; + +static Music_Emu* new_kss_emu () { return BLARGG_NEW Kss_Emu ; } +static Music_Emu* new_kss_file() { return BLARGG_NEW Kss_File; } + +gme_type_t_ const gme_kss_type [1] = { "MSX", 256, &new_kss_emu, &new_kss_file, "KSS", 0x03 }; + +// Setup + +void Kss_Emu::update_gain() +{ + double g = gain() * 1.4; + if ( scc_accessed ) + g *= 1.5; + ay.volume( g ); + scc.volume( g ); + if ( sn ) + sn->volume( g ); +} + +blargg_err_t Kss_Emu::load_( Data_Reader& in ) +{ + memset( &header_, 0, sizeof header_ ); + assert( offsetof (header_t,device_flags) == header_size - 1 ); + assert( offsetof (ext_header_t,msx_audio_vol) == ext_header_size - 1 ); + RETURN_ERR( rom.load( in, header_size, STATIC_CAST(header_t*,&header_), 0 ) ); + + RETURN_ERR( check_kss_header( header_.tag ) ); + + if ( header_.tag [3] == 'C' ) + { + if ( header_.extra_header ) + { + header_.extra_header = 0; + set_warning( "Unknown data in header" ); + } + if ( header_.device_flags & ~0x0F ) + { + header_.device_flags &= 0x0F; + set_warning( "Unknown data in header" ); + } + } + else + { + ext_header_t& ext = header_; + memcpy( &ext, rom.begin(), min( (int) ext_header_size, (int) header_.extra_header ) ); + if ( header_.extra_header > 0x10 ) + set_warning( "Unknown data in header" ); + } + + if ( header_.device_flags & 0x09 ) + set_warning( "FM sound not supported" ); + + scc_enabled = 0xC000; + if ( header_.device_flags & 0x04 ) + scc_enabled = 0; + + if ( header_.device_flags & 0x02 && !sn ) + CHECK_ALLOC( sn = BLARGG_NEW( Sms_Apu ) ); + + set_voice_count( osc_count ); + + return setup_buffer( ::clock_rate ); +} + +void Kss_Emu::update_eq( blip_eq_t const& eq ) +{ + ay.treble_eq( eq ); + scc.treble_eq( eq ); + if ( sn ) + sn->treble_eq( eq ); +} + +void Kss_Emu::set_voice( int i, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right ) +{ + int i2 = i - ay.osc_count; + if ( i2 >= 0 ) + scc.osc_output( i2, center ); + else + ay.osc_output( i, center ); + if ( sn && i < sn->osc_count ) + sn->osc_output( i, center, left, right ); +} + +// Emulation + +void Kss_Emu::set_tempo_( double t ) +{ + blip_time_t period = + (header_.device_flags & 0x40 ? ::clock_rate / 50 : ::clock_rate / 60); + play_period = blip_time_t (period / t); +} + +blargg_err_t Kss_Emu::start_track_( int track ) +{ + RETURN_ERR( Classic_Emu::start_track_( track ) ); + + memset( ram, 0xC9, 0x4000 ); + memset( ram + 0x4000, 0, sizeof ram - 0x4000 ); + + // copy driver code to lo RAM + static byte const bios [] = { + 0xD3, 0xA0, 0xF5, 0x7B, 0xD3, 0xA1, 0xF1, 0xC9, // $0001: WRTPSG + 0xD3, 0xA0, 0xDB, 0xA2, 0xC9 // $0009: RDPSG + }; + static byte const vectors [] = { + 0xC3, 0x01, 0x00, // $0093: WRTPSG vector + 0xC3, 0x09, 0x00, // $0096: RDPSG vector + }; + memcpy( ram + 0x01, bios, sizeof bios ); + memcpy( ram + 0x93, vectors, sizeof vectors ); + + // copy non-banked data into RAM + unsigned load_addr = get_le16( header_.load_addr ); + long orig_load_size = get_le16( header_.load_size ); + long load_size = min( orig_load_size, rom.file_size() ); + load_size = min( load_size, long (mem_size - load_addr) ); + if ( load_size != orig_load_size ) + set_warning( "Excessive data size" ); + memcpy( ram + load_addr, rom.begin() + header_.extra_header, load_size ); + + rom.set_addr( -load_size - header_.extra_header ); + + // check available bank data + blargg_long const bank_size = this->bank_size(); + int max_banks = (rom.file_size() - load_size + bank_size - 1) / bank_size; + bank_count = header_.bank_mode & 0x7F; + if ( bank_count > max_banks ) + { + bank_count = max_banks; + set_warning( "Bank data missing" ); + } + //dprintf( "load_size : $%X\n", load_size ); + //dprintf( "bank_size : $%X\n", bank_size ); + //dprintf( "bank_count: %d (%d claimed)\n", bank_count, header_.bank_mode & 0x7F ); + + ram [idle_addr] = 0xFF; + cpu::reset( unmapped_write, unmapped_read ); + cpu::map_mem( 0, mem_size, ram, ram ); + + ay.reset(); + scc.reset(); + if ( sn ) + sn->reset(); + r.sp = 0xF380; + ram [--r.sp] = idle_addr >> 8; + ram [--r.sp] = idle_addr & 0xFF; + r.b.a = track; + r.pc = get_le16( header_.init_addr ); + next_play = play_period; + scc_accessed = false; + gain_updated = false; + update_gain(); + ay_latch = 0; + + return 0; +} + +void Kss_Emu::set_bank( int logical, int physical ) +{ + unsigned const bank_size = this->bank_size(); + + unsigned addr = 0x8000; + if ( logical && bank_size == 8 * 1024 ) + addr = 0xA000; + + physical -= header_.first_bank; + if ( (unsigned) physical >= (unsigned) bank_count ) + { + byte* data = ram + addr; + cpu::map_mem( addr, bank_size, data, data ); + } + else + { + long phys = physical * (blargg_long) bank_size; + for ( unsigned offset = 0; offset < bank_size; offset += page_size ) + cpu::map_mem( addr + offset, page_size, + unmapped_write, rom.at_addr( phys + offset ) ); + } +} + +void Kss_Emu::cpu_write( unsigned addr, int data ) +{ + data &= 0xFF; + switch ( addr ) + { + case 0x9000: + set_bank( 0, data ); + return; + + case 0xB000: + set_bank( 1, data ); + return; + } + + int scc_addr = (addr & 0xDFFF) ^ 0x9800; + if ( scc_addr < scc.reg_count ) + { + scc_accessed = true; + scc.write( time(), scc_addr, data ); + return; + } + + dprintf( "LD ($%04X),$%02X\n", addr, data ); +} + +void kss_cpu_write( Kss_Cpu* cpu, unsigned addr, int data ) +{ + *cpu->write( addr ) = data; + if ( (addr & STATIC_CAST(Kss_Emu&,*cpu).scc_enabled) == 0x8000 ) + STATIC_CAST(Kss_Emu&,*cpu).cpu_write( addr, data ); +} + +void kss_cpu_out( Kss_Cpu* cpu, cpu_time_t time, unsigned addr, int data ) +{ + data &= 0xFF; + Kss_Emu& emu = STATIC_CAST(Kss_Emu&,*cpu); + switch ( addr & 0xFF ) + { + case 0xA0: + emu.ay_latch = data & 0x0F; + return; + + case 0xA1: + GME_APU_HOOK( &emu, emu.ay_latch, data ); + emu.ay.write( time, emu.ay_latch, data ); + return; + + case 0x06: + if ( emu.sn && (emu.header_.device_flags & 0x04) ) + { + emu.sn->write_ggstereo( time, data ); + return; + } + break; + + case 0x7E: + case 0x7F: + if ( emu.sn ) + { + GME_APU_HOOK( &emu, 16, data ); + emu.sn->write_data( time, data ); + return; + } + break; + + case 0xFE: + emu.set_bank( 0, data ); + return; + + #ifndef NDEBUG + case 0xF1: // FM data + if ( data ) + break; // trap non-zero data + case 0xF0: // FM addr + case 0xA8: // PPI + return; + #endif + } + + dprintf( "OUT $%04X,$%02X\n", addr, data ); +} + +int kss_cpu_in( Kss_Cpu*, cpu_time_t, unsigned addr ) +{ + //Kss_Emu& emu = STATIC_CAST(Kss_Emu&,*cpu); + //switch ( addr & 0xFF ) + //{ + //} + + dprintf( "IN $%04X\n", addr ); + return 0; +} + +// Emulation + +blargg_err_t Kss_Emu::run_clocks( blip_time_t& duration, int ) +{ + while ( time() < duration ) + { + blip_time_t end = min( duration, next_play ); + cpu::run( min( duration, next_play ) ); + if ( r.pc == idle_addr ) + set_time( end ); + + if ( time() >= next_play ) + { + next_play += play_period; + if ( r.pc == idle_addr ) + { + if ( !gain_updated ) + { + gain_updated = true; + if ( scc_accessed ) + update_gain(); + } + + ram [--r.sp] = idle_addr >> 8; + ram [--r.sp] = idle_addr & 0xFF; + r.pc = get_le16( header_.play_addr ); + GME_FRAME_HOOK( this ); + } + } + } + + duration = time(); + next_play -= duration; + check( next_play >= 0 ); + adjust_time( -duration ); + ay.end_frame( duration ); + scc.end_frame( duration ); + if ( sn ) + sn->end_frame( duration ); + + return 0; +} |