/[VRac]/Galeb.pm
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /Galeb.pm

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Revision 188 - (show annotations)
Sun Sep 30 20:05:20 2007 UTC (11 years, 6 months ago) by dpavlin
File size: 5108 byte(s)
Galeb displays first graphics display (correct size, but inverted and
flipped)
1 package Galeb;
2
3 use warnings;
4 use strict;
5
6 use Carp qw/confess/;
7 use File::Slurp;
8 use Data::Dump qw/dump/;
9 use M6502;
10 use Screen;
11
12 use base qw(Class::Accessor VRac M6502 Screen Prefs Session);
13 #__PACKAGE__->mk_accessors(qw());
14
15 =head1 NAME
16
17 Galeb - Galeb emulator
18
19 =head1 VERSION
20
21 Version 0.00
22
23 =cut
24
25 our $VERSION = '0.00';
26
27 =head1 SUMMARY
28
29 Emulator for Galeb 8-bit 6502 machine from Croatia
30
31 =cut
32
33 =head1 FUNCTIONS
34
35 =head2 run
36
37 Start emulator, open L<Screen>, load initial ROM images, and start emulator loop
38
39 =cut
40
41 our $emu;
42
43 sub run {
44 my $self = shift;
45
46 warn "Galeb calling upstream init\n";
47 $self->SUPER::init(
48 read => sub { $self->read( @_ ) },
49 write => sub { $self->write( @_ ) },
50 );
51
52 warn "Galeb $Galeb::VERSION emulation starting\n";
53
54 # $self->scale( 2 );
55 $self->show_mem( 1 );
56 $self->load_session( 'sess/current' );
57
58 $self->open_screen;
59 $self->load_rom({
60 0xc000 => 'rom/Galeb/BAS01.rom',
61 0xc800 => 'rom/Galeb/BAS02.rom',
62 0xd000 => 'rom/Galeb/BAS03.rom',
63 0xd800 => 'rom/Galeb/BAS04.rom',
64 0xf000 => 'rom/Galeb/EXMD.rom',
65 0xf800 => 'rom/Galeb/MAKbug.rom',
66 });
67
68 $PC = $mem[ 0xfffc ];
69 warn sprintf("starting from address at 0xfffc = 0x%04x", $PC);
70
71 $emu = $self;
72
73 # $self->trace( 1 );
74 # $self->debug( 1 );
75
76 warn "rendering memory\n";
77 $self->render_mem( @mem );
78
79 M6502::reset();
80
81 $self->loop( sub {
82 my $run_for = shift;
83 warn sprintf("about to exec from PC %04x for %d cycles\n", $PC, $run_for) if $self->trace;
84 M6502::exec( $run_for );
85 $self->render_vram;
86 });
87 };
88
89
90 =head1 Helper functions
91
92 =head2 load_image
93
94 Load binary files, ROM images and Galeb Emulator files
95
96 $emu->load_image( '/path/to/file', 0x1000 );
97
98 Returns true on success.
99
100 =cut
101
102 sub load_image {
103 my $self = shift;
104 my ( $path, $addr ) = @_;
105
106 if ( ! -e $path ) {
107 warn "ERROR: file $path doesn't exist\n";
108 return;
109 }
110
111 my $size = -s $path || confess "no size for $path: $!";
112
113 my $buff = read_file( $path );
114
115 if ( $size == 65567 ) {
116 $addr = 0;
117 warn sprintf "loading Galaksija emulator 64k dump %s at %04x - %04x %02x\n", $path, $addr, $addr+$size-1, $size;
118 $self->write_chunk( $addr, substr($buff,0x20) );
119 return 1;
120 }
121
122 printf "loading %s at %04x - %04x %02x\n", $path, $addr, $addr+$size-1, $size;
123 $self->write_chunk( $addr, $buff );
124 return 1;
125 };
126
127
128 =head1 Memory management
129
130 =cut
131
132 =head2 read
133
134 Read from memory
135
136 $byte = read( $address );
137
138 =cut
139
140 sub read {
141 my $self = shift;
142 my ($addr) = @_;
143 return if ( $addr > 0xffff );
144 my $byte = $mem[$addr];
145 confess sprintf("can't find memory at address %04x",$addr) unless defined($byte);
146 warn sprintf("# Galeb::read(%04x) = %02x\n", $addr, $byte) if $self->trace;
147
148 $self->mmap_pixel( $addr, 0, $byte, 0 ) if $self->show_mem;
149 return $byte;
150 }
151
152 =head2 write
153
154 Write into emory
155
156 write( $address, $byte );
157
158 =cut
159
160 sub write {
161 my $self = shift;
162 my ($addr,$byte) = @_;
163 warn sprintf("# Galeb::write(%04x,%02x)\n", $addr, $byte) if $self->trace;
164
165 if ( $addr > 0xc000 ) {
166 confess sprintf "write access 0x%04x > 0xc000 aborting\n", $addr;
167 }
168
169 $self->mmap_pixel( $addr, $byte, 0, 0 ) if $self->show_mem;
170 $mem[$addr] = $byte;
171 return;
172 }
173
174 =head1 Architecture specific
175
176 =head2 render_vram
177
178 Render one frame of video ram
179
180 $self->render_vram;
181
182 =cut
183
184 my $char_rom = 'rom/Galeb/CHRGEN.rom';
185
186 my @chars = map { ord($_) } split(//, read_file( $char_rom ));
187 warn "loaded ", $#chars, " characters from $char_rom\n";
188
189 my $last_dump = '';
190
191 my $x_size = 48;
192 my $y_size = 16;
193 my $c_h = 8;
194
195 sub screen_width { $x_size * 8 }
196 sub screen_height { $y_size * $c_h }
197
198 sub render_vram {
199 my $self = shift;
200
201 my $addr = 0xb000;
202
203 my $dump;
204
205 my @pixels = ("\x00") x ( $x_size * $y_size * 8 );
206
207 for my $y ( 0 .. $y_size - 1 ) {
208 $dump .= sprintf "%2d: %s\n",$y, join('', map { chr( $_ ) } @mem[ $addr+15 .. $addr+62 ] );
209
210 foreach my $x ( 0 .. $x_size - 1 ) {
211 my $c = $mem[ $addr + 15 + $x ];
212 my $l = $x_size * $c_h;
213 foreach my $o ( 0 .. $c_h - 1 ) {
214 $pixels[ ( $y * $l ) + $x + ( $o * $x_size ) ] = $chars[ ( $c * $c_h ) + $o ];
215 }
216 }
217
218 $addr += 64;
219 }
220
221 if ( $dump ne $last_dump ) {
222 # print $dump;
223 $last_dump = $dump;
224
225 my $vram = SDL::Surface->new(
226 -width => $x_size * 8,
227 -height => $y_size * $c_h,
228 -depth => 1, # 1 bit per pixel
229 -pitch => $x_size, # bytes per line
230 -from => pack("C*", @pixels),
231 );
232 $vram->set_colors( 0, $white, $black );
233
234 $self->render_frame( $vram );
235 }
236 }
237
238 =head2 cpu_PC
239
240 Helper metod to set or get PC for current architecture
241
242 =cut
243
244 sub cpu_PC {
245 my ( $self, $addr ) = @_;
246 if ( defined($addr) ) {
247 $PC = $addr;
248 warn sprintf("running from PC %04x\n", $PC);
249 };
250 return $PC;
251 }
252
253 =head1 SEE ALSO
254
255 L<VRac>, L<M6502>, L<Screen>, L<Tape>
256
257 =head1 AUTHOR
258
259 Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
260
261 =head1 ACKNOWLEDGEMENTS
262
263 See also L<http://www.foing.hr/~fng_josip/orao.htm> which is source of all
264 info about this machine (and even hardware implementation from 2007).
265
266 =head1 COPYRIGHT & LICENSE
267
268 Copyright 2007 Dobrica Pavlinusic, All Rights Reserved.
269
270 This program is free software; you can redistribute it and/or modify it
271 under the same terms as Perl itself.
272
273 =cut
274
275 1; # End of Galeb

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