A presentation on libGDX for the GTUG at metalab.

1. Game Development with
By Gabriel Grill

2. LibGDX is ...
 open source
 cross-platform
 Desktop
 Web
 Smartphone
 performant
 JNI Wrapper
 optimised for Davlik VM
 well documented
 Wiki, Forum, Blog, JavaDoc, Demos, Videos, ..

3. LibGDX has ...
 great tooling
 Particle-, Body-, Fonteditor
 TMX and TWL support
 Texture packer
 backends for
 Jogl, LWJGL, Angle
 SoundTouch, KissFFT
 Mpg123, Tremor
 nightly builds and regular releases

4. Getting Started - Desktop
1. create Project
2. download and move libGDX to libs/
3. Java Build Path
 gdx.jar, gdx-backend-jogl.jar
 and the corresponding “-natives.jar“
public class HelloWorldDesktop {
public static void main(String[] argv) {
new JoglApplication(new App(), "Title",
width, height, false/*Gl 2.0*/);
}
}

5. Application
http://libgdx.googlecode.com/svn/wiki/img/application_lifecycle_diagram.png
public class App implements ApplicationListener
{
public void resume() { }
public void resize(int width, int height) { }
public void render(){ }
public void pause(){ }
public void dispose(){ }
public void create(){ }
}

6. Getting Started - Android
1. create Android Project
2. copy libGDX to libs/
3. <uses-sdk minSdkVersion="3" targetSdkVersion="8"/>
4. Java Build Path
 gdx.jar, gdx-backend-android.jar
 Desktop Project
public class HelloWorldAndroid extends AndroidApplication {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initialize(new App(), false /*Gl 2.0*/);
}
}

7. Assets and Input
 File API
 Classpath, File system
 Asset folder data/
 AssetManager
 Texture-, Fixture-, TileAtlas
 Json- and XML Processing
 Polling and event-based Input
 Remote Input, compass and accelerometer

8. Graphics
 OpenGL ES 1.0, 1.1 and 2.0
 Shaders, Framebuffer Objects, Mipmaps
 Batched and cached sprite rendering
 Particle System, TMX tile map rendering
 2D scene graph with tweening framework
 OBJ and MD5 model loaders
 soon FBX/Collada
 Key-frame and skeletal animation
 Ortographic and perspective camera

9. Miscellaneous
 Custom Collections, Sorting
 Preferences
 Vector, Matrix and Quaternion classes
 JNI wrapper of box2d
 Shapes, intersection and overlap testing
 Vibrator support
 WAV, MP3 and OGG support
 Playback and recording
 AdWhirl, Admob
 GDX-JNIGEN

10. Performance
 renders a scene of 32 32 pixel sprites in a grid - 336 sprites
 AndEngine:
 Hero: ~17fps
 Nexus One: ~41fps
 Libgdx:
 Hero: ~51fps
 Nexus One: ~51fps
 Android 1.5 - Hero:
 FloatBuffer.put( float value ): 40.774 secs
 FloatBuffer.put(int index, float value): 42.710 secs
 FloatBuffer.put( float[] values ): 41.109 sec
 IntBuffer.put( int[] values): 12.59 secs
 JNI -> BufferUtils.copy(): 0.14 secs
 Android 2.2 - Nexus One:
 FloatBuffer.put( float value ): 6.876 secs
 FloatBuffer.put(int index, float value): 7.006 secs
 FloatBuffer.put( float[] values ): 6.800 sec
 IntBuffer.put( int[] values): 1.479 secs
 JNI -> BufferUtils.copy(): 0.067 secs

11. Demos
Now let‘s see some Code

12. Sources
 http://code.google.com/p/libgdx/wiki/
 http://code.google.com/p/libgdx-users/wiki/
 http://libgdx.badlogicgames.com/nightlies/docs/api/
 http://www.badlogicgames.com/wordpress/
 http://www.badlogicgames.com/wordpress/?p=816
 http://www.badlogicgames.com/wordpress/?p=904