The document provides a comprehensive guide on game development using Perl and SDL, covering topics such as setting up the environment, creating a simple game loop, and integrating features like collision detection and event handling. It includes code snippets to illustrate the use of SDL with Perl, highlighting both low-level and high-level programming methods. Additionally, it features discussions on integrating music and sprites, along with a call to action for further community involvement through GitHub and IRC resources.

1. Game
Development
With Perl and SDL
- press start -

2. Perl
SDL

3. Perl
SDL

4. Perl
SDL

5. Simple DirectMedia Layer

6. low level access

7. Video

8. Audio

9. Input Devices

10. cross-platform

11. Multimedia App
libSDL
DirectX GDI framebuffer Xlib Quartz
...
MS Windows Linux OS X

12. LGPL v2

13. Round 1 . . .
F IGH T !

14. 1:1 API

15. use strict;
use warnings;
use SDL;
use SDL::Video;
use SDL::Surface;
use SDL::Rect;
SDL::init(SDL_INIT_VIDEO);
my ($screen_w, $screen_h) = (800, 600);
my $screen = SDL::Video::set_video_mode(
$screen_w,
$screen_h,
32,
SDL_ANYFORMAT
);
my $blue = SDL::Video::map_RGB($screen->format(), 0, 0, 255);
SDL::Video::fill_rect(
$screen,
SDL::Rect->new(15, 15, 100, 100),
$blue
);
SDL::Video::update_rect($screen, 0, 0, $screen_w, $screen_h);
sleep 5; # so we have time to see!

16. Too low level

17. Not Perlish at all!

18. SDLx::* Sugar

19. use strict;
use warnings;
use SDLx::App;
my $app = SDLx::App->new(
width => 800,
height => 600,
);
$app->draw_rect(
[15, 15, 100, 100], # rect
[0,0,255,255], # blue
);
$app->update;
sleep 5; # so we have time to see!

20. The Game Loop

21. while ( $running ) {
get_events();
update_game();
render_scene();
}

22. while( $running ) {
$loops = 0;
while(
get_tick_count() > $next_game_tick
&& $loops < $MAX_FRAMESKIP
) {
get_events();
update_game();
$next_game_tick += $SKIP_TICKS;
$loops++;
}
$interpolation = ( get_tick_count()
+ $SKIP_TICKS - $next_game_tick
)
/ $SKIP_TICKS;
render_scene( $interpolation );
}

24. SDLx::App->run;

25. use SDLx::App;
my $app = SDLx::App->new;
$app->add_move_handler( &update );
$app->add_event_handler( &player_1 );
$app->add_event_handler( &player_2 );
$app->add_show_handler( &scene );
$app->run;

26. Avenger

27. Avenger

28. sugary syntax

29. use Avenger title => 'My Game';
update { ... };
show { ... };
event 'key_down' => sub { ... };
event 'mouse_left' => sub { ... };
start;

30. Box2D
integration

31. use Avenger title => 'My Game';
world->gravity( 0, -100 );
my $player = world->create_dynamic( x => 30, y => 100 );
my $floor = world->create_static(
y => 50,
w => app->w -100 ,
h => 10,
);
update { world->update };
show {
app->clear( [0, 0, 0, 255] );
app->draw_rect( $floor->rect, [0, 255, 0, 255] );
app->draw_rect( $player->rect, [255, 50, 0, 255] );
app->update;
};
start;

32. Simple games, easy.
Complex games, possible!

33. use Avenger;
use MyGame;
start 'MainScreen';

34. package MyGame::MainScreen;
use Avenger;
load { ... };
unload { ... };
update { ... };
event { ... };
show { ... };
1;

35. Other SDLx Goodies

36. my $menu = SDLx::Widget::Menu->new;
$menu->items(
'New Game' => sub { ... },
'Load Game' => sub { ... },
'Options' => sub { ... },
'Quit' => sub { ... },
);
show { $menu->render( app ) };

37. my $text = SDLx::Text->new(
font => '/path/to/my/font.ttf',
color => 'white',
h_align => 'center',
shadow => 1,
bold => 1,
);
$text->write_to(
app,
'All your base are belong to us.'
);

38. my $music = SDLx::Music->new;
$music->data(
intro => {
loops => 3,
fade_in => 0.5,
volume => 72,
},
gameover => {
finished => sub { print 'Done!' },
},
);
$music->play( 'intro' );

39. my $sprite = SDLx::Sprite::Animated->new;
$sprite->load( 'hero.png' )->start;
show { $sprite->draw( app ) };

40. HUGE TODO LIST!

41. github.com/PerlGameDev
#sdl (irc.perl.org)
sdl-devel-subscribe@perl.org
@SDLPerl

42. Thank You
For Playing !
garu@cpan.org
@garu_rj