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package Screen; |
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|
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# Dobrica Pavlinusic, <dpavlin@rot13.org> 07/30/07 17:58:55 CEST |
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|
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use strict; |
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use warnings; |
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|
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use SDL::App; |
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use SDL::Rect; |
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use SDL::Color; |
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use SDL::Constants; |
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|
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use Carp qw/confess/; |
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use Data::Dump qw/dump/; |
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|
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use Exporter 'import'; |
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our @EXPORT = qw'$white $black @flip'; |
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|
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use base qw(Class::Accessor Prefs); |
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__PACKAGE__->mk_accessors(qw(app event screen_width screen_height)); |
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|
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=head1 NAME |
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|
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Screen - simulated monochrome screen using SDL |
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|
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=head1 Architecture dependent |
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|
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You may override following methods if you want to implement keyboard on each |
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keypress event. Alternative is to use <read> hook and trap memory access. |
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|
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=head2 screen_width |
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|
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Width of emulated screen (256 by default) |
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|
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=head2 screen_height |
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|
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Height of emulated screen (256 by default) |
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|
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=head2 key_down |
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|
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$self->key_down( 'a' ); |
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|
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=cut |
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|
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sub key_down {} |
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|
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=head2 key_up |
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|
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$self->key_up( 'a' ); |
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|
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=cut |
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|
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sub key_up {} |
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|
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|
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=head1 Architecture independent |
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|
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You don't need to override any of following function in your architecture, |
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but you might want to call them. |
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|
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=head2 open_screen |
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|
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Open simulated screen |
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|
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=cut |
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|
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our $app; |
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|
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sub open_screen { |
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my $self = shift; |
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|
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$self->prefs; |
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|
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if ( ! $self->scale ) { |
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$self->scale( 1 ); |
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warn "using default unscaled display\n"; |
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} |
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|
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$self->screen_width( 256 ) unless defined $self->screen_width; |
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$self->screen_height( 256 ) unless defined $self->screen_height; |
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|
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$app = SDL::App->new( |
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-width => $self->screen_width * $self->scale + ( $self->show_mem ? 256 : 0 ), |
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-height => $self->screen_height * $self->scale, |
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-depth => 16, |
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-flags=>SDL_DOUBLEBUF | SDL_HWSURFACE | SDL_HWACCEL, |
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); |
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#$app->grab_input( SDL_GRAB_QUERY ); |
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$app->grab_input( SDL_GRAB_OFF ); |
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$app->title( ref($self) ); |
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|
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$self->app( $app ); |
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|
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my $event = SDL::Event->new(); |
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$self->event( $event ); |
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|
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warn "# created SDL::App with screen ", $self->screen_width, "x", $self->screen_height, "\n"; |
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} |
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|
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our $white = SDL::Color->new( -r => 0xff, -g => 0xff, -b => 0xff ); |
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our $black = SDL::Color->new( -r => 0x80, -g => 0x80, -b => 0x80 ); |
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|
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my $red = SDL::Color->new( -r => 0xff, -g => 0x00, -b => 0x00 ); |
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my $green = SDL::Color->new( -r => 0x00, -g => 0xff, -b => 0x00 ); |
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my $blue = SDL::Color->new( -r => 0x00, -g => 0x00, -b => 0xff ); |
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|
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=head2 mem_xy |
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|
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Helper to return x and y coordinates in memory map |
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|
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my ( $x,$y ) = $screen->mem_xy( $address ); |
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|
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=cut |
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|
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sub mem_xy { |
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my $self = shift; |
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my $offset = shift; |
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my $x = $offset & 0xff; |
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$x += $self->screen_width * $self->scale; |
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my $y = $offset >> 8; |
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return ($x,$y); |
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} |
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|
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=head2 mmap_pixel |
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|
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Draw pixel in memory map |
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$self->mmap_pixel( $addr, $r, $g, $b ); |
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|
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=cut |
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# keep accesses to memory |
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my $_mem_stat; |
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|
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sub mmap_pixel { |
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my ( $self, $addr, $r, $g, $b ) = @_; |
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return unless $self->show_mem && $self->app; |
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|
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my ( $x, $y ) = $self->mem_xy( $addr ); |
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warn sprintf "## mem %04x %02x %02x %02d*%02d\n", $addr, $r, $g, $x, $y if $self->debug; |
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|
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my $col = SDL::Color->new( -r => $r, -g => $g, -b => $b ); |
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$self->app->pixel( $x, $y, $col ); |
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|
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$_mem_stat++; |
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if ( $_mem_stat % 1000 == 0 ) { |
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$self->app->sync; |
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} |
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} |
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|
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|
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=head2 sync |
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|
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$self->sync; |
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|
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=cut |
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|
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sub sync { |
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$app->sync; |
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} |
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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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sub render_vram { |
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my $self = shift; |
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|
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confess "please implement $self::render_vram"; |
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} |
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|
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|
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=head2 render_frame |
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Render one frame of video ram |
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|
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$self->render_frame( $vram_sdl_surface ); |
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|
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=cut |
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|
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sub render_frame { |
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my $self = shift; |
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|
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my $vram = shift; |
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confess "need SDL::Surface as argument" unless ref($vram) eq 'SDL::Surface'; |
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|
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$vram->display_format; |
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my $scale = $self->scale || confess "no scale?"; |
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|
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my $rect = SDL::Rect->new( -x => 0, -y => 0, -width => $self->screen_width * $scale, -height => $self->screen_height * $scale |
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); |
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my $rect_screen = SDL::Rect->new( -x => 0, -y => 0, -width => $self->screen_width * $scale, -height => $self->screen_height * $scale ); |
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|
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if ( $scale > 1 ) { |
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use SDL::Tool::Graphic; |
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# last parametar is anti-alias |
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my $zoomed = SDL::Tool::Graphic->zoom( $vram, $self->scale, $self->scale, 1 ); |
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$zoomed->blit( $rect, $app, $rect_screen ); |
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} else { |
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$vram->blit( $rect, $app, $rect_screen ); |
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} |
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|
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$app->sync; |
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} |
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|
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|
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=head2 render_mem |
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|
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$self->render_mem( @mem ); |
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|
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=cut |
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|
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sub render_mem { |
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my $self = shift; |
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return unless $self->show_mem; |
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my $pixels = pack("C*", @_); |
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my $vram = SDL::Surface->new( |
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-width => 256, |
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-height => 256, |
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-depth => 8, # 1 bit per pixel |
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-pitch => 256, # bytes per line |
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-from => $pixels, |
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-Rmask => 0xffff00ff, |
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-Gmask => 0xffff00ff, |
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-Bmask => 0xffff00ff, |
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); |
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|
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$vram->display_format; |
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|
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my $rect = SDL::Rect->new( -x => 0, -y => 0, -width => $self->screen_width, -height => $self->screen_height ); |
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my $rect_mem = SDL::Rect->new( -x => $self->screen_width * $self->scale, -y => 0, -width => 256, -height => 256 ); |
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$vram->blit( $rect, $app, $rect_mem ); |
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|
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$app->sync; |
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} |
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|
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=head2 key_pressed |
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Check SDL event loop if there are any pending keys |
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my $key = $self->key_pressed; |
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if ( $self->key_pressed( 1 ) ) { |
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# just to check other events, don't process |
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# key |
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} |
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|
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=cut |
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|
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my $pending_key; |
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my $key_active; |
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my $run_for = 2000; |
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|
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sub key_pressed { |
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my $self = shift; |
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# don't take key, just pull event |
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my $just_checking = shift || 0; |
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|
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my $event = $self->event || confess "no event?"; |
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|
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if ( ! $event->poll ) { |
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return $pending_key unless $self->can('session_event'); |
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if ( my $h = $self->session_event('key_pressed') ) { |
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my ( $key, $state ) = %$h; |
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if ( $state ) { |
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$pending_key = $key; |
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$self->key_down( $key ); |
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$key_active->{$key} = 1; |
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} else { |
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undef $pending_key; |
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$self->key_up( $key ); |
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$key_active->{$key} = 0; |
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} |
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} |
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return $pending_key; |
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} |
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|
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my $type = $event->type(); |
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|
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exit if ($type == SDL_QUIT); |
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|
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my $k = $pending_key; |
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|
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if ($type == SDL_KEYDOWN) { |
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$k = $event->key_name(); |
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if ( $k eq 'escape' ) { |
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$run_for = $self->cli; |
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warn "will check event loop every $run_for cycles\n"; |
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$pending_key = '~'; |
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} else { |
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warn "SDL_KEYDOWN ($type) = '$k'", $just_checking ? ' fake' : '', "\n"; |
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$pending_key = $k; |
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$self->key_down( $k ); |
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$key_active->{$k} = 1; |
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$self->record_session('key_pressed', { $k => 1 }); |
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} |
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} elsif ( $type == SDL_KEYUP ) { |
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my $up = $event->key_name(); |
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warn "SDL_KEYUP ($type) = '$up'", $just_checking ? ' fake' : '', "\n"; |
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$self->key_up( $up ); |
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$key_active->{$up} = 0; |
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$self->record_session('key_pressed', { $up => 0 }); |
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undef $pending_key; |
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} |
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|
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warn "key_pressed = $pending_key\n" if ( $pending_key ); |
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|
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return $pending_key; |
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} |
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|
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=head2 key_active |
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|
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Is key currently pressed on keyboard or in session? |
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|
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$self->key_active( 'left shift', 'right shift', 'a' ); |
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|
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=cut |
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|
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sub key_active { |
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my $self = shift; |
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my @keys = @_; |
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confess "Regexp is no longer supported" if ref($_[0]) eq 'Regexp'; |
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|
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my $active = 0; |
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foreach my $key ( @keys ) { |
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$active++ if $key_active->{$key}; |
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} |
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|
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warn "## key_active(",dump(@keys),") = $active\n" if $active; |
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return $active; |
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} |
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|
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=head2 loop |
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|
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Implement CPU run for C<$run_run> cycles inside SDL event loop |
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|
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$self->loop( sub { |
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my $run_for = shift; |
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CPU::exec( $run_for ); |
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$self->render_vram; |
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} ); |
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|
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=cut |
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|
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sub loop { |
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my $self = shift; |
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my $exec = shift; |
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|
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confess "need coderef as argument" unless ref($exec) eq 'CODE'; |
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my $event = SDL::Event->new(); |
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|
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while ( 1 ) { |
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$self->key_pressed( 1 ); |
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$exec->($run_for); |
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} |
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} |
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|
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# helper array to flip bytes for display |
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our @flip; |
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|
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foreach my $i ( 0 .. 255 ) { |
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my $t = 0; |
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$i & 0b00000001 and $t = $t | 0b10000000; |
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$i & 0b00000010 and $t = $t | 0b01000000; |
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$i & 0b00000100 and $t = $t | 0b00100000; |
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$i & 0b00001000 and $t = $t | 0b00010000; |
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$i & 0b00010000 and $t = $t | 0b00001000; |
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$i & 0b00100000 and $t = $t | 0b00000100; |
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$i & 0b01000000 and $t = $t | 0b00000010; |
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$i & 0b10000000 and $t = $t | 0b00000001; |
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#warn "$i = $t\n"; |
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$flip[$i] = $t; |
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} |
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|
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=head1 SEE ALSO |
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|
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L<Orao> is sample implementation using this module |
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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 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; |
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