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package Galeb; |
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|
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use warnings; |
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use strict; |
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|
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use Carp qw/confess/; |
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use File::Slurp; |
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use Data::Dump qw/dump/; |
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use M6502; |
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use Screen; |
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|
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use base qw(Class::Accessor VRac M6502 Screen Prefs Session); |
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#__PACKAGE__->mk_accessors(qw()); |
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|
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=head1 NAME |
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|
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Galeb - Galeb emulator |
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|
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=head1 VERSION |
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|
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Version 0.00 |
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|
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=cut |
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|
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our $VERSION = '0.00'; |
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|
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=head1 SUMMARY |
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|
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Emulator for Galeb 8-bit 6502 machine from Croatia |
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|
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=cut |
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|
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=head1 FUNCTIONS |
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|
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=head2 run |
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|
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Start emulator, open L<Screen>, load initial ROM images, and start emulator loop |
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|
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=cut |
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|
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our $emu; |
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|
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sub run { |
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my $self = shift; |
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|
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warn "Galeb calling upstream init\n"; |
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$self->SUPER::init( |
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read => sub { $self->read( @_ ) }, |
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write => sub { $self->write( @_ ) }, |
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); |
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|
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warn "Galeb $Galeb::VERSION emulation starting\n"; |
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|
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# $self->scale( 2 ); |
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$self->show_mem( 1 ); |
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$self->load_session( 'sess/current' ); |
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|
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$self->open_screen; |
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$self->load_rom({ |
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0xc000 => 'rom/Galeb/BAS01.rom', |
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0xc800 => 'rom/Galeb/BAS02.rom', |
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0xd000 => 'rom/Galeb/BAS03.rom', |
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0xd800 => 'rom/Galeb/BAS04.rom', |
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0xf000 => 'rom/Galeb/EXMD.rom', |
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0xf800 => 'rom/Galeb/MAKbug.rom', |
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}); |
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|
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$PC = $mem[ 0xfffc ]; |
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warn sprintf("starting from address at 0xfffc = 0x%04x", $PC); |
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|
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$emu = $self; |
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|
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# $self->trace( 1 ); |
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# $self->debug( 1 ); |
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|
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warn "rendering memory\n"; |
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$self->render_mem( @mem ); |
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|
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M6502::reset(); |
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|
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$self->loop( sub { |
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my $run_for = shift; |
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warn sprintf("about to exec from PC %04x for %d cycles\n", $PC, $run_for) if $self->trace; |
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M6502::exec( $run_for ); |
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$self->render_vram; |
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}); |
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}; |
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|
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|
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=head1 Helper functions |
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|
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=head2 load_image |
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|
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Load binary files, ROM images and Galeb Emulator files |
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|
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$emu->load_image( '/path/to/file', 0x1000 ); |
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|
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Returns true on success. |
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|
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=cut |
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|
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sub load_image { |
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my $self = shift; |
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my ( $path, $addr ) = @_; |
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|
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if ( ! -e $path ) { |
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warn "ERROR: file $path doesn't exist\n"; |
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return; |
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} |
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|
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my $size = -s $path || confess "no size for $path: $!"; |
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|
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my $buff = read_file( $path ); |
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|
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if ( $size == 65567 ) { |
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$addr = 0; |
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warn sprintf "loading Galaksija emulator 64k dump %s at %04x - %04x %02x\n", $path, $addr, $addr+$size-1, $size; |
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$self->write_chunk( $addr, substr($buff,0x20) ); |
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return 1; |
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} |
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|
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printf "loading %s at %04x - %04x %02x\n", $path, $addr, $addr+$size-1, $size; |
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$self->write_chunk( $addr, $buff ); |
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return 1; |
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}; |
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|
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|
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=head1 Memory management |
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|
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=cut |
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|
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=head2 read |
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|
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Read from memory |
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|
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$byte = read( $address ); |
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|
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=cut |
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|
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sub read { |
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my $self = shift; |
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my ($addr) = @_; |
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return if ( $addr > 0xffff ); |
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my $byte = $mem[$addr]; |
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confess sprintf("can't find memory at address %04x",$addr) unless defined($byte); |
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warn sprintf("# Galeb::read(%04x) = %02x\n", $addr, $byte) if $self->trace; |
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|
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$self->mmap_pixel( $addr, 0, $byte, 0 ) if $self->show_mem; |
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return $byte; |
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} |
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|
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=head2 write |
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|
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Write into emory |
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|
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write( $address, $byte ); |
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|
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=cut |
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|
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sub write { |
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my $self = shift; |
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my ($addr,$byte) = @_; |
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warn sprintf("# Galeb::write(%04x,%02x)\n", $addr, $byte) if $self->trace; |
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|
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if ( $addr > 0xc000 ) { |
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confess sprintf "write access 0x%04x > 0xc000 aborting\n", $addr; |
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} |
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|
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$self->mmap_pixel( $addr, $byte, 0, 0 ) if $self->show_mem; |
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$mem[$addr] = $byte; |
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return; |
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} |
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|
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=head1 Architecture specific |
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|
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=head2 render_vram |
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|
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Render one frame of video ram |
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|
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$self->render_vram; |
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|
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=cut |
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|
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my $char_rom = 'rom/Galeb/CHRGEN.rom'; |
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|
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my @chars = map { ord($_) } split(//, read_file( $char_rom )); |
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warn "loaded ", $#chars, " characters from $char_rom\n"; |
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|
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my $last_dump = ''; |
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|
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my $x_size = 48; |
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my $y_size = 16; |
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my $c_h = 8; |
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|
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sub screen_width { $x_size * 8 } |
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sub screen_height { $y_size * $c_h } |
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|
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sub render_vram { |
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my $self = shift; |
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|
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my $addr = 0xb000; |
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|
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my $dump; |
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|
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my @pixels = ("\x00") x ( $x_size * $y_size * 8 ); |
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|
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for my $y ( 0 .. $y_size - 1 ) { |
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$dump .= sprintf "%2d: %s\n",$y, join('', map { chr( $_ ) } @mem[ $addr+15 .. $addr+62 ] ); |
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|
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foreach my $x ( 0 .. $x_size - 1 ) { |
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my $c = $mem[ $addr + 15 + $x ]; |
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my $l = $x_size * $c_h; |
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foreach my $o ( 0 .. $c_h - 1 ) { |
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$pixels[ ( $y * $l ) + $x + ( $o * $x_size ) ] = $chars[ ( $c * $c_h ) + $o ]; |
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} |
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} |
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|
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$addr += 64; |
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} |
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|
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if ( $dump ne $last_dump ) { |
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# print $dump; |
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$last_dump = $dump; |
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|
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my $vram = SDL::Surface->new( |
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-width => $x_size * 8, |
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-height => $y_size * $c_h, |
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-depth => 1, # 1 bit per pixel |
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-pitch => $x_size, # bytes per line |
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-from => pack("C*", @pixels), |
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); |
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$vram->set_colors( 0, $white, $black ); |
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|
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$self->render_frame( $vram ); |
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} |
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} |
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|
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=head2 cpu_PC |
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|
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Helper metod to set or get PC for current architecture |
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|
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=cut |
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|
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sub cpu_PC { |
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my ( $self, $addr ) = @_; |
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if ( defined($addr) ) { |
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$PC = $addr; |
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warn sprintf("running from PC %04x\n", $PC); |
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}; |
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return $PC; |
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} |
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|
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=head1 SEE ALSO |
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|
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L<VRac>, L<M6502>, L<Screen>, L<Tape> |
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|
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=head1 AUTHOR |
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|
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Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
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|
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=head1 ACKNOWLEDGEMENTS |
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|
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See also L<http://www.foing.hr/~fng_josip/orao.htm> which is source of all |
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info about this machine (and even hardware implementation from 2007). |
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|
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=head1 COPYRIGHT & LICENSE |
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|
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Copyright 2007 Dobrica Pavlinusic, All Rights Reserved. |
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|
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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|
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=cut |
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|
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1; # End of Galeb |
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