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416 lines
9.7 KiB
C++
416 lines
9.7 KiB
C++
// Game_Music_Emu 0.6.0. http://www.slack.net/~ant/
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#include "Kss_Emu.h"
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#include "blargg_endian.h"
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#include <string.h>
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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 clock_rate = 3579545;
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int const osc_count = Ay_Apu::osc_count + Scc_Apu::osc_count;
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Kss_Emu::Kss_Emu()
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{
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sn = 0;
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set_type( gme_kss_type );
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set_silence_lookahead( 6 );
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static const char* const names [osc_count] = {
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"Square 1", "Square 2", "Square 3",
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"Wave 1", "Wave 2", "Wave 3", "Wave 4", "Wave 5"
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};
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set_voice_names( names );
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static int const types [osc_count] = {
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wave_type | 0, wave_type | 1, wave_type | 2,
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wave_type | 3, wave_type | 4, wave_type | 5, wave_type | 6, wave_type | 7
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};
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set_voice_types( types );
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memset( unmapped_read, 0xFF, sizeof unmapped_read );
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}
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Kss_Emu::~Kss_Emu() { unload(); }
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void Kss_Emu::unload()
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{
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delete sn;
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sn = 0;
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Classic_Emu::unload();
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}
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// Track info
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static void copy_kss_fields( Kss_Emu::header_t const& h, track_info_t* out )
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{
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const char* system = "MSX";
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if ( h.device_flags & 0x02 )
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{
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system = "Sega Master System";
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if ( h.device_flags & 0x04 )
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system = "Game Gear";
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}
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Gme_File::copy_field_( out->system, system );
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}
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blargg_err_t Kss_Emu::track_info_( track_info_t* out, int ) const
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{
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copy_kss_fields( header_, out );
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return 0;
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}
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static blargg_err_t check_kss_header( void const* header )
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{
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if ( memcmp( header, "KSCC", 4 ) && memcmp( header, "KSSX", 4 ) )
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return gme_wrong_file_type;
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return 0;
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}
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struct Kss_File : Gme_Info_
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{
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Kss_Emu::header_t header_;
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Kss_File() { set_type( gme_kss_type ); }
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blargg_err_t load_( Data_Reader& in )
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{
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blargg_err_t err = in.read( &header_, Kss_Emu::header_size );
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if ( err )
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return (err == in.eof_error ? gme_wrong_file_type : err);
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return check_kss_header( &header_ );
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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_kss_fields( header_, out );
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return 0;
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}
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};
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static Music_Emu* new_kss_emu () { return BLARGG_NEW Kss_Emu ; }
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static Music_Emu* new_kss_file() { return BLARGG_NEW Kss_File; }
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static gme_type_t_ const gme_kss_type_ = { "MSX", 256, &new_kss_emu, &new_kss_file, "KSS", 0x03 };
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gme_type_t const gme_kss_type = &gme_kss_type_;
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// Setup
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void Kss_Emu::update_gain()
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{
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double g = gain() * 1.4;
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if ( scc_accessed )
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g *= 1.5;
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ay.volume( g );
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scc.volume( g );
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if ( sn )
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sn->volume( g );
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}
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blargg_err_t Kss_Emu::load_( Data_Reader& in )
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{
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memset( &header_, 0, sizeof header_ );
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assert( offsetof (header_t,device_flags) == header_size - 1 );
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assert( offsetof (ext_header_t,msx_audio_vol) == ext_header_size - 1 );
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RETURN_ERR( rom.load( in, header_size, STATIC_CAST(header_t*,&header_), 0 ) );
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RETURN_ERR( check_kss_header( header_.tag ) );
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if ( header_.tag [3] == 'C' )
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{
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if ( header_.extra_header )
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{
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header_.extra_header = 0;
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set_warning( "Unknown data in header" );
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}
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if ( header_.device_flags & ~0x0F )
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{
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header_.device_flags &= 0x0F;
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set_warning( "Unknown data in header" );
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}
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}
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else
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{
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ext_header_t& ext = header_;
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memcpy( &ext, rom.begin(), min( (int) ext_header_size, (int) header_.extra_header ) );
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if ( header_.extra_header > 0x10 )
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set_warning( "Unknown data in header" );
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}
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if ( header_.device_flags & 0x09 )
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set_warning( "FM sound not supported" );
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scc_enabled = 0xC000;
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if ( header_.device_flags & 0x04 )
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scc_enabled = 0;
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if ( header_.device_flags & 0x02 && !sn )
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CHECK_ALLOC( sn = BLARGG_NEW( Sms_Apu ) );
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set_voice_count( osc_count );
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return setup_buffer( ::clock_rate );
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}
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void Kss_Emu::update_eq( blip_eq_t const& eq )
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{
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ay.treble_eq( eq );
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scc.treble_eq( eq );
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if ( sn )
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sn->treble_eq( eq );
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}
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void Kss_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 - ay.osc_count;
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if ( i2 >= 0 )
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scc.osc_output( i2, center );
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else
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ay.osc_output( i, center );
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if ( sn && i < sn->osc_count )
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sn->osc_output( i, center, left, right );
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}
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// Emulation
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void Kss_Emu::set_tempo_( double t )
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{
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blip_time_t period =
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(header_.device_flags & 0x40 ? ::clock_rate / 50 : ::clock_rate / 60);
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play_period = blip_time_t (period / t);
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}
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blargg_err_t Kss_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( ram, 0xC9, 0x4000 );
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memset( ram + 0x4000, 0, sizeof ram - 0x4000 );
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// copy driver code to lo RAM
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static byte const bios [] = {
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0xD3, 0xA0, 0xF5, 0x7B, 0xD3, 0xA1, 0xF1, 0xC9, // $0001: WRTPSG
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0xD3, 0xA0, 0xDB, 0xA2, 0xC9 // $0009: RDPSG
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};
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static byte const vectors [] = {
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0xC3, 0x01, 0x00, // $0093: WRTPSG vector
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0xC3, 0x09, 0x00, // $0096: RDPSG vector
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};
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memcpy( ram + 0x01, bios, sizeof bios );
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memcpy( ram + 0x93, vectors, sizeof vectors );
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// copy non-banked data into RAM
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unsigned load_addr = get_le16( header_.load_addr );
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long orig_load_size = get_le16( header_.load_size );
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long load_size = min( orig_load_size, rom.file_size() );
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load_size = min( load_size, long (mem_size - load_addr) );
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if ( load_size != orig_load_size )
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set_warning( "Excessive data size" );
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memcpy( ram + load_addr, rom.begin() + header_.extra_header, load_size );
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rom.set_addr( -load_size - header_.extra_header );
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// check available bank data
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blargg_long const bank_size = this->bank_size();
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int max_banks = (rom.file_size() - load_size + bank_size - 1) / bank_size;
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bank_count = header_.bank_mode & 0x7F;
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if ( bank_count > max_banks )
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{
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bank_count = max_banks;
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set_warning( "Bank data missing" );
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}
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//debug_printf( "load_size : $%X\n", load_size );
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//debug_printf( "bank_size : $%X\n", bank_size );
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//debug_printf( "bank_count: %d (%d claimed)\n", bank_count, header_.bank_mode & 0x7F );
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ram [idle_addr] = 0xFF;
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cpu::reset( unmapped_write, unmapped_read );
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cpu::map_mem( 0, mem_size, ram, ram );
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ay.reset();
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scc.reset();
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if ( sn )
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sn->reset();
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r.sp = 0xF380;
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ram [--r.sp] = idle_addr >> 8;
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ram [--r.sp] = idle_addr & 0xFF;
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r.b.a = track;
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r.pc = get_le16( header_.init_addr );
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next_play = play_period;
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scc_accessed = false;
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gain_updated = false;
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update_gain();
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ay_latch = 0;
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return 0;
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}
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void Kss_Emu::set_bank( int logical, int physical )
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{
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unsigned const bank_size = this->bank_size();
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unsigned addr = 0x8000;
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if ( logical && bank_size == 8 * 1024 )
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addr = 0xA000;
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physical -= header_.first_bank;
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if ( (unsigned) physical >= (unsigned) bank_count )
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{
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byte* data = ram + addr;
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cpu::map_mem( addr, bank_size, data, data );
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}
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else
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{
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long phys = physical * (blargg_long) bank_size;
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for ( unsigned offset = 0; offset < bank_size; offset += page_size )
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cpu::map_mem( addr + offset, page_size,
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unmapped_write, rom.at_addr( phys + offset ) );
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}
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}
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void Kss_Emu::cpu_write( unsigned addr, int data )
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{
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data &= 0xFF;
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switch ( addr )
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{
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case 0x9000:
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set_bank( 0, data );
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return;
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case 0xB000:
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set_bank( 1, data );
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return;
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}
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int scc_addr = (addr & 0xDFFF) ^ 0x9800;
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if ( scc_addr < scc.reg_count )
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{
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scc_accessed = true;
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scc.write( time(), scc_addr, data );
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return;
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}
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debug_printf( "LD ($%04X),$%02X\n", addr, data );
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}
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void kss_cpu_write( Kss_Cpu* cpu, unsigned addr, int data )
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{
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*cpu->write( addr ) = data;
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if ( (addr & STATIC_CAST(Kss_Emu&,*cpu).scc_enabled) == 0x8000 )
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STATIC_CAST(Kss_Emu&,*cpu).cpu_write( addr, data );
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}
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void kss_cpu_out( Kss_Cpu* cpu, cpu_time_t time, unsigned addr, int data )
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{
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data &= 0xFF;
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Kss_Emu& emu = STATIC_CAST(Kss_Emu&,*cpu);
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switch ( addr & 0xFF )
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{
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case 0xA0:
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emu.ay_latch = data & 0x0F;
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return;
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case 0xA1:
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GME_APU_HOOK( &emu, emu.ay_latch, data );
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emu.ay.write( time, emu.ay_latch, data );
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return;
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case 0x06:
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if ( emu.sn && (emu.header_.device_flags & 0x04) )
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{
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emu.sn->write_ggstereo( time, data );
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return;
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}
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break;
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case 0x7E:
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case 0x7F:
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if ( emu.sn )
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{
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GME_APU_HOOK( &emu, 16, data );
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emu.sn->write_data( time, data );
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return;
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}
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break;
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case 0xFE:
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emu.set_bank( 0, data );
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return;
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#ifndef NDEBUG
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case 0xF1: // FM data
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if ( data )
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break; // trap non-zero data
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case 0xF0: // FM addr
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case 0xA8: // PPI
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return;
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#endif
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}
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debug_printf( "OUT $%04X,$%02X\n", addr, data );
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}
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int kss_cpu_in( Kss_Cpu*, cpu_time_t, unsigned addr )
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{
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//Kss_Emu& emu = STATIC_CAST(Kss_Emu&,*cpu);
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//switch ( addr & 0xFF )
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//{
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//}
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debug_printf( "IN $%04X\n", addr );
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return 0;
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}
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// Emulation
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blargg_err_t Kss_Emu::run_clocks( blip_time_t& duration, int )
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{
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while ( time() < duration )
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{
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blip_time_t end = min( duration, next_play );
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cpu::run( min( duration, next_play ) );
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if ( r.pc == idle_addr )
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set_time( end );
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if ( time() >= next_play )
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{
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next_play += play_period;
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if ( r.pc == idle_addr )
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{
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if ( !gain_updated )
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{
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gain_updated = true;
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if ( scc_accessed )
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update_gain();
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}
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ram [--r.sp] = idle_addr >> 8;
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ram [--r.sp] = idle_addr & 0xFF;
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r.pc = get_le16( header_.play_addr );
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GME_FRAME_HOOK( this );
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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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adjust_time( -duration );
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ay.end_frame( duration );
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scc.end_frame( duration );
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if ( sn )
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sn->end_frame( duration );
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return 0;
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}
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