Game Development with SDL and Perl

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Over the past couple of years the SDL Perl bindings have gone through a complete rewrite, making them modular, stable, faster, multiplatform, 1:1 compatible with libsdl and fixing several memory leaks while at it.

The community is more alive than ever and now the SDL Perl project is ready to move the Perl motto into gamedev:

"Simple games, easy. Complex games, possible."

In this talk I'll discuss some of the sugar layers being developed on top of SDL Perl, including game loops, widgets, physics engines and full-fledged frameworks for easy game development.

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Game Development with SDL and Perl

  1. 1. GameDevelopmentWith Perl and SDL - press start -
  2. 2. PerlSDL
  3. 3. PerlSDL
  4. 4. PerlSDL
  5. 5. Simple DirectMedia Layer
  6. 6. low level access
  7. 7. Video
  8. 8. Audio
  9. 9. Input Devices
  10. 10. cross-platform
  11. 11. Multimedia App libSDLDirectX GDI framebuffer Xlib Quartz ...MS Windows Linux OS X
  12. 12. LGPL v2
  13. 13. Round 1 . . . F IGH T !
  14. 14. 1:1 API
  15. 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. 16. Too low level
  17. 17. Not Perlish at all!
  18. 18. SDLx::* Sugar
  19. 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. 20. The Game Loop
  21. 21. while ( $running ) { get_events(); update_game(); render_scene();}
  22. 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 );}
  23. 23. SDLx::App->run;
  24. 24. 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;
  25. 25. Avenger
  26. 26. Avenger
  27. 27. sugary syntax
  28. 28. use Avenger title => My Game;update { ... };show { ... };event key_down => sub { ... };event mouse_left => sub { ... };start;
  29. 29. Box2Dintegration
  30. 30. 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;
  31. 31. Simple games, easy.Complex games, possible!
  32. 32. use Avenger;use MyGame;start MainScreen;
  33. 33. package MyGame::MainScreen;use Avenger;load { ... };unload { ... };update { ... };event { ... };show { ... };1;
  34. 34. Other SDLx Goodies
  35. 35. my $menu = SDLx::Widget::Menu->new;$menu->items( New Game => sub { ... }, Load Game => sub { ... }, Options => sub { ... }, Quit => sub { ... },);show { $menu->render( app ) };
  36. 36. 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.);
  37. 37. my $music = SDLx::Music->new;$music->data( intro => { loops => 3, fade_in => 0.5, volume => 72, }, gameover => { finished => sub { print Done! }, },);$music->play( intro );
  38. 38. my $sprite = SDLx::Sprite::Animated->new;$sprite->load( hero.png )->start;show { $sprite->draw( app ) };
  39. 39. HUGE TODO LIST!
  40. 40. github.com/PerlGameDev #sdl (irc.perl.org)sdl-devel-subscribe@perl.org @SDLPerl
  41. 41. Thank YouFor Playing ! garu@cpan.org @garu_rj

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