mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-11-29 23:41:48 +00:00
405 lines
9.8 KiB
C++
405 lines
9.8 KiB
C++
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
|
|
|
|
#include "Ay_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 spectrum_clock = 3546900;
|
|
long const cpc_clock = 2000000;
|
|
|
|
unsigned const ram_start = 0x4000;
|
|
int const osc_count = Ay_Apu::osc_count + 1;
|
|
|
|
Ay_Emu::Ay_Emu()
|
|
{
|
|
beeper_output = 0;
|
|
set_type( gme_ay_type );
|
|
|
|
static const char* const names [osc_count] = {
|
|
"Wave 1", "Wave 2", "Wave 3", "Beeper"
|
|
};
|
|
set_voice_names( names );
|
|
|
|
static int const types [osc_count] = {
|
|
wave_type | 0, wave_type | 1, wave_type | 2, mixed_type | 0
|
|
};
|
|
set_voice_types( types );
|
|
set_silence_lookahead( 6 );
|
|
}
|
|
|
|
Ay_Emu::~Ay_Emu() { }
|
|
|
|
// Track info
|
|
|
|
static byte const* get_data( Ay_Emu::file_t const& file, byte const* ptr, int min_size )
|
|
{
|
|
long pos = ptr - (byte const*) file.header;
|
|
long file_size = file.end - (byte const*) file.header;
|
|
assert( (unsigned long) pos <= (unsigned long) file_size - 2 );
|
|
int offset = (int16_t) get_be16( ptr );
|
|
if ( !offset || blargg_ulong (pos + offset) > blargg_ulong (file_size - min_size) )
|
|
return 0;
|
|
return ptr + offset;
|
|
}
|
|
|
|
static blargg_err_t parse_header( byte const* in, long size, Ay_Emu::file_t* out )
|
|
{
|
|
typedef Ay_Emu::header_t header_t;
|
|
out->header = (header_t const*) in;
|
|
out->end = in + size;
|
|
|
|
if ( size < Ay_Emu::header_size )
|
|
return gme_wrong_file_type;
|
|
|
|
header_t const& h = *(header_t const*) in;
|
|
if ( memcmp( h.tag, "ZXAYEMUL", 8 ) )
|
|
return gme_wrong_file_type;
|
|
|
|
out->tracks = get_data( *out, h.track_info, (h.max_track + 1) * 4 );
|
|
if ( !out->tracks )
|
|
return "Missing track data";
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void copy_ay_fields( Ay_Emu::file_t const& file, track_info_t* out, int track )
|
|
{
|
|
Gme_File::copy_field_( out->song, (char const*) get_data( file, file.tracks + track * 4, 1 ) );
|
|
byte const* track_info = get_data( file, file.tracks + track * 4 + 2, 6 );
|
|
if ( track_info )
|
|
out->length = get_be16( track_info + 4 ) * (1000L / 50); // frames to msec
|
|
|
|
Gme_File::copy_field_( out->author, (char const*) get_data( file, file.header->author, 1 ) );
|
|
Gme_File::copy_field_( out->comment, (char const*) get_data( file, file.header->comment, 1 ) );
|
|
}
|
|
|
|
blargg_err_t Ay_Emu::track_info_( track_info_t* out, int track ) const
|
|
{
|
|
copy_ay_fields( file, out, track );
|
|
return 0;
|
|
}
|
|
|
|
struct Ay_File : Gme_Info_
|
|
{
|
|
Ay_Emu::file_t file;
|
|
|
|
Ay_File() { set_type( gme_ay_type ); }
|
|
|
|
blargg_err_t load_mem_( byte const* begin, long size )
|
|
{
|
|
RETURN_ERR( parse_header( begin, size, &file ) );
|
|
set_track_count( file.header->max_track + 1 );
|
|
return 0;
|
|
}
|
|
|
|
blargg_err_t track_info_( track_info_t* out, int track ) const
|
|
{
|
|
copy_ay_fields( file, out, track );
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
static Music_Emu* new_ay_emu () { return BLARGG_NEW Ay_Emu ; }
|
|
static Music_Emu* new_ay_file() { return BLARGG_NEW Ay_File; }
|
|
|
|
static gme_type_t_ const gme_ay_type_ = { "ZX Spectrum", 0, &new_ay_emu, &new_ay_file, "AY", 1 };
|
|
BLARGG_EXPORT extern gme_type_t const gme_ay_type = &gme_ay_type_;
|
|
|
|
// Setup
|
|
|
|
blargg_err_t Ay_Emu::load_mem_( byte const* in, long size )
|
|
{
|
|
assert( offsetof (header_t,track_info [2]) == header_size );
|
|
|
|
RETURN_ERR( parse_header( in, size, &file ) );
|
|
set_track_count( file.header->max_track + 1 );
|
|
|
|
if ( file.header->vers > 2 )
|
|
set_warning( "Unknown file version" );
|
|
|
|
set_voice_count( osc_count );
|
|
apu.volume( gain() );
|
|
|
|
return setup_buffer( spectrum_clock );
|
|
}
|
|
|
|
void Ay_Emu::update_eq( blip_eq_t const& eq )
|
|
{
|
|
apu.treble_eq( eq );
|
|
}
|
|
|
|
void Ay_Emu::set_voice( int i, Blip_Buffer* center, Blip_Buffer*, Blip_Buffer* )
|
|
{
|
|
if ( i >= Ay_Apu::osc_count )
|
|
beeper_output = center;
|
|
else
|
|
apu.osc_output( i, center );
|
|
}
|
|
|
|
// Emulation
|
|
|
|
void Ay_Emu::set_tempo_( double t )
|
|
{
|
|
play_period = blip_time_t (clock_rate() / 50 / t);
|
|
}
|
|
|
|
blargg_err_t Ay_Emu::start_track_( int track )
|
|
{
|
|
RETURN_ERR( Classic_Emu::start_track_( track ) );
|
|
|
|
memset( mem.ram + 0x0000, 0xC9, 0x100 ); // fill RST vectors with RET
|
|
memset( mem.ram + 0x0100, 0xFF, 0x4000 - 0x100 );
|
|
memset( mem.ram + ram_start, 0x00, sizeof mem.ram - ram_start );
|
|
memset( mem.padding1, 0xFF, sizeof mem.padding1 );
|
|
memset( mem.ram + 0x10000, 0xFF, sizeof mem.ram - 0x10000 );
|
|
|
|
// locate data blocks
|
|
byte const* const data = get_data( file, file.tracks + track * 4 + 2, 14 );
|
|
if ( !data ) return "File data missing";
|
|
|
|
byte const* const more_data = get_data( file, data + 10, 6 );
|
|
if ( !more_data ) return "File data missing";
|
|
|
|
byte const* blocks = get_data( file, data + 12, 8 );
|
|
if ( !blocks ) return "File data missing";
|
|
|
|
// initial addresses
|
|
cpu::reset( mem.ram );
|
|
r.sp = get_be16( more_data );
|
|
r.b.a = r.b.b = r.b.d = r.b.h = data [8];
|
|
r.b.flags = r.b.c = r.b.e = r.b.l = data [9];
|
|
r.alt.w = r.w;
|
|
r.ix = r.iy = r.w.hl;
|
|
|
|
unsigned addr = get_be16( blocks );
|
|
if ( !addr ) return "File data missing";
|
|
|
|
unsigned init = get_be16( more_data + 2 );
|
|
if ( !init )
|
|
init = addr;
|
|
|
|
// copy blocks into memory
|
|
do
|
|
{
|
|
blocks += 2;
|
|
unsigned len = get_be16( blocks ); blocks += 2;
|
|
if ( addr + len > 0x10000 )
|
|
{
|
|
set_warning( "Bad data block size" );
|
|
len = 0x10000 - addr;
|
|
}
|
|
check( len );
|
|
byte const* in = get_data( file, blocks, 0 ); blocks += 2;
|
|
if ( len > blargg_ulong (file.end - in) )
|
|
{
|
|
set_warning( "Missing file data" );
|
|
len = file.end - in;
|
|
}
|
|
//debug_printf( "addr: $%04X, len: $%04X\n", addr, len );
|
|
if ( addr < ram_start && addr >= 0x400 ) // several tracks use low data
|
|
debug_printf( "Block addr in ROM\n" );
|
|
memcpy( mem.ram + addr, in, len );
|
|
|
|
if ( file.end - blocks < 8 )
|
|
{
|
|
set_warning( "Missing file data" );
|
|
break;
|
|
}
|
|
}
|
|
while ( (addr = get_be16( blocks )) != 0 );
|
|
|
|
// copy and configure driver
|
|
static byte const passive [] = {
|
|
0xF3, // DI
|
|
0xCD, 0, 0, // CALL init
|
|
0xED, 0x5E, // LOOP: IM 2
|
|
0xFB, // EI
|
|
0x76, // HALT
|
|
0x18, 0xFA // JR LOOP
|
|
};
|
|
static byte const active [] = {
|
|
0xF3, // DI
|
|
0xCD, 0, 0, // CALL init
|
|
0xED, 0x56, // LOOP: IM 1
|
|
0xFB, // EI
|
|
0x76, // HALT
|
|
0xCD, 0, 0, // CALL play
|
|
0x18, 0xF7 // JR LOOP
|
|
};
|
|
memcpy( mem.ram, passive, sizeof passive );
|
|
unsigned play_addr = get_be16( more_data + 4 );
|
|
//debug_printf( "Play: $%04X\n", play_addr );
|
|
if ( play_addr )
|
|
{
|
|
memcpy( mem.ram, active, sizeof active );
|
|
mem.ram [ 9] = play_addr;
|
|
mem.ram [10] = play_addr >> 8;
|
|
}
|
|
mem.ram [2] = init;
|
|
mem.ram [3] = init >> 8;
|
|
|
|
mem.ram [0x38] = 0xFB; // Put EI at interrupt vector (followed by RET)
|
|
|
|
memcpy( mem.ram + 0x10000, mem.ram, 0x80 ); // some code wraps around (ugh)
|
|
|
|
beeper_delta = int (apu.amp_range * 0.65);
|
|
last_beeper = 0;
|
|
apu.reset();
|
|
next_play = play_period;
|
|
|
|
// start at spectrum speed
|
|
change_clock_rate( spectrum_clock );
|
|
set_tempo( tempo() );
|
|
|
|
spectrum_mode = false;
|
|
cpc_mode = false;
|
|
cpc_latch = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Emulation
|
|
|
|
void Ay_Emu::cpu_out_misc( cpu_time_t time, unsigned addr, int data )
|
|
{
|
|
if ( !cpc_mode )
|
|
{
|
|
switch ( addr & 0xFEFF )
|
|
{
|
|
case 0xFEFD:
|
|
spectrum_mode = true;
|
|
apu_addr = data & 0x0F;
|
|
return;
|
|
|
|
case 0xBEFD:
|
|
spectrum_mode = true;
|
|
apu.write( time, apu_addr, data );
|
|
return;
|
|
}
|
|
}
|
|
|
|
if ( !spectrum_mode )
|
|
{
|
|
switch ( addr >> 8 )
|
|
{
|
|
case 0xF6:
|
|
switch ( data & 0xC0 )
|
|
{
|
|
case 0xC0:
|
|
apu_addr = cpc_latch & 0x0F;
|
|
goto enable_cpc;
|
|
|
|
case 0x80:
|
|
apu.write( time, apu_addr, cpc_latch );
|
|
goto enable_cpc;
|
|
}
|
|
break;
|
|
|
|
case 0xF4:
|
|
cpc_latch = data;
|
|
goto enable_cpc;
|
|
}
|
|
}
|
|
|
|
debug_printf( "Unmapped OUT: $%04X <- $%02X\n", addr, data );
|
|
return;
|
|
|
|
enable_cpc:
|
|
if ( !cpc_mode )
|
|
{
|
|
cpc_mode = true;
|
|
change_clock_rate( cpc_clock );
|
|
set_tempo( tempo() );
|
|
}
|
|
}
|
|
|
|
void ay_cpu_out( Ay_Cpu* cpu, cpu_time_t time, unsigned addr, int data )
|
|
{
|
|
Ay_Emu& emu = STATIC_CAST(Ay_Emu&,*cpu);
|
|
|
|
if ( (addr & 0xFF) == 0xFE && !emu.cpc_mode )
|
|
{
|
|
int delta = emu.beeper_delta;
|
|
data &= 0x10;
|
|
if ( emu.last_beeper != data )
|
|
{
|
|
emu.last_beeper = data;
|
|
emu.beeper_delta = -delta;
|
|
emu.spectrum_mode = true;
|
|
if ( emu.beeper_output )
|
|
emu.apu.synth_.offset( time, delta, emu.beeper_output );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
emu.cpu_out_misc( time, addr, data );
|
|
}
|
|
}
|
|
|
|
int ay_cpu_in( Ay_Cpu*, unsigned addr )
|
|
{
|
|
// keyboard read and other things
|
|
if ( (addr & 0xFF) == 0xFE )
|
|
return 0xFF; // other values break some beeper tunes
|
|
|
|
debug_printf( "Unmapped IN : $%04X\n", addr );
|
|
return 0xFF;
|
|
}
|
|
|
|
blargg_err_t Ay_Emu::run_clocks( blip_time_t& duration, int )
|
|
{
|
|
set_time( 0 );
|
|
if ( !(spectrum_mode | cpc_mode) )
|
|
duration /= 2; // until mode is set, leave room for halved clock rate
|
|
|
|
while ( time() < duration )
|
|
{
|
|
cpu::run( min( duration, (blip_time_t) next_play ) );
|
|
|
|
if ( time() >= next_play )
|
|
{
|
|
next_play += play_period;
|
|
|
|
if ( r.iff1 )
|
|
{
|
|
if ( mem.ram [r.pc] == 0x76 )
|
|
r.pc++;
|
|
|
|
r.iff1 = r.iff2 = 0;
|
|
|
|
mem.ram [--r.sp] = uint8_t (r.pc >> 8);
|
|
mem.ram [--r.sp] = uint8_t (r.pc);
|
|
r.pc = 0x38;
|
|
cpu::adjust_time( 12 );
|
|
if ( r.im == 2 )
|
|
{
|
|
cpu::adjust_time( 6 );
|
|
unsigned addr = r.i * 0x100u + 0xFF;
|
|
r.pc = mem.ram [(addr + 1) & 0xFFFF] * 0x100u + mem.ram [addr];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
duration = time();
|
|
next_play -= duration;
|
|
check( next_play >= 0 );
|
|
adjust_time( -duration );
|
|
|
|
apu.end_frame( duration );
|
|
|
|
return 0;
|
|
}
|