Unfinished huge refactoring towards backend modules system.

Done: Audio, Graphics.
Tbd: Input, cleanup Config, cleanup old BaseApp etc

src/mightypork/gamecore/backend/Backend.java

@@ -1,9 +1,9 @@
 package mightypork.gamecore.backend;
 
 
-import mightypork.gamecore.render.RenderModule;
-import mightypork.utils.eventbus.BusAccess;
-import mightypork.utils.eventbus.clients.RootBusNode;
+import mightypork.gamecore.render.GraphicsModule;
+import mightypork.gamecore.resources.audio.AudioModule;
+import mightypork.utils.eventbus.clients.BusNode;
 
 
 /**
@@ -13,8 +13,7 @@ import mightypork.utils.eventbus.clients.RootBusNode;
  * 
  * @author MightyPork
  */
-public abstract class Backend extends RootBusNode {
-	
+public abstract class Backend extends BusNode {
 	
 	/**
 	 * Initialize backend modules, add them to event bus.<br>
@@ -28,5 +27,13 @@ public abstract class Backend extends RootBusNode {
 	 * 
 	 * @return graphics module
 	 */
-	public abstract RenderModule getRenderer();
+	public abstract GraphicsModule getGraphics();
+	
+	
+	/**
+	 * Get graphics module (renderer)
+	 * 
+	 * @return graphics module
+	 */
+	public abstract AudioModule getAudio();
 }

src/mightypork/gamecore/backend/BackendModule.java

@@ -2,7 +2,6 @@ package mightypork.gamecore.backend;
 
 
 import mightypork.utils.annotations.Stub;
-import mightypork.utils.eventbus.BusAccess;
 import mightypork.utils.eventbus.clients.BusNode;
 import mightypork.utils.interfaces.Destroyable;
 
@@ -14,20 +13,9 @@ import mightypork.utils.interfaces.Destroyable;
  */
 public abstract class BackendModule extends BusNode implements Destroyable {
 	
-	/**
-	 * Create a module with bus access
-	 * 
-	 * @param busAccess
-	 */
-	public BackendModule(BusAccess busAccess) {
-		super(busAccess);
-	}
-	
-	
 	@Override
 	@Stub
 	public void destroy()
 	{
 	}
-	
 }

src/mightypork/gamecore/backend/lwjgl/InitTaskRedirectSlickLog.java

@@ -0,0 +1,38 @@
+package mightypork.gamecore.backend.lwjgl;
+
+
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.initializers.InitTask;
+import mightypork.gamecore.util.SlickLogRedirector;
+import mightypork.utils.logging.writers.LogWriter;
+
+
+/**
+ * Initializer that redirects slick logging to main logger.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class InitTaskRedirectSlickLog extends InitTask {
+	
+	@Override
+	public void run(App app)
+	{
+		LogWriter ml = mightypork.utils.logging.Log.getMainLogger();
+		SlickLogRedirector slr = new SlickLogRedirector(ml);
+		org.newdawn.slick.util.Log.setLogSystem(slr);
+	}
+	
+	
+	@Override
+	public String getName()
+	{
+		return "slick_log";
+	}
+	
+	
+	@Override
+	public String[] getDependencies()
+	{
+		return new String[] { "log" };
+	}
+}

src/mightypork/gamecore/backend/lwjgl/LwjglBackend.java

@@ -2,31 +2,39 @@ package mightypork.gamecore.backend.lwjgl;
 
 
 import mightypork.gamecore.backend.Backend;
-import mightypork.gamecore.render.RenderModule;
-import mightypork.utils.eventbus.BusAccess;
+import mightypork.gamecore.render.GraphicsModule;
+import mightypork.gamecore.resources.audio.AudioModule;
 
 
 /**
- * Game backend using LWJGL
+ * Game backend using LWJGL and SlickUtil
  * 
  * @author MightyPork
  */
 public class LwjglBackend extends Backend {
 	
-	private LwjglRenderModule renderer;
+	private LwjglGraphicsModule graphics;
+	private SlickAudioModule audio;
 	
 	
 	@Override
 	public void initialize()
 	{
-		addChildClient(renderer = new LwjglRenderModule(this));
+		addChildClient(graphics = new LwjglGraphicsModule());
+		addChildClient(audio = new SlickAudioModule());
 	}
 	
 	
 	@Override
-	public RenderModule getRenderer()
+	public GraphicsModule getGraphics()
 	{
-		return renderer;
+		return graphics;
 	}
 	
+	
+	@Override
+	public AudioModule getAudio()
+	{
+		return audio;
+	}
 }

src/mightypork/gamecore/backend/lwjgl/LwjglGraphicsModule.java

@@ -6,15 +6,14 @@ import static org.lwjgl.opengl.GL11.*;
 import java.nio.ByteBuffer;
 import java.util.Stack;
 
+import mightypork.gamecore.core.modules.App;
 import mightypork.gamecore.render.Grad;
-import mightypork.gamecore.render.RenderModule;
+import mightypork.gamecore.render.GraphicsModule;
 import mightypork.gamecore.render.Screenshot;
 import mightypork.gamecore.render.events.DisplayReadyEvent;
 import mightypork.gamecore.render.events.ViewportChangeEvent;
-import mightypork.gamecore.resources.textures.ITexture;
-import mightypork.gamecore.resources.textures.LazyTexture;
+import mightypork.gamecore.resources.textures.DeferredTexture;
 import mightypork.gamecore.resources.textures.TxQuad;
-import mightypork.utils.eventbus.BusAccess;
 import mightypork.utils.logging.Log;
 import mightypork.utils.math.color.Color;
 import mightypork.utils.math.color.pal.RGB;
@@ -35,11 +34,7 @@ import org.lwjgl.opengl.GL11;
  * 
  * @author MightyPork
  */
-public class LwjglRenderModule extends RenderModule {
-	
-	public LwjglRenderModule(BusAccess busAccess) {
-		super(busAccess);
-	}
+public class LwjglGraphicsModule extends GraphicsModule {
 	
 	/** Currently binded color */
 	private Color activeColor = null;
@@ -48,7 +43,7 @@ public class LwjglRenderModule extends RenderModule {
 	/** Stack of pushed colors */
 	private Stack<Color> colorPushStack = new Stack<>();
 	/** Currently binded texture */
-	private ITexture activeTexture;
+	private SlickTexture activeTexture;
 	
 	/** Display mode used currently for the window */
 	private DisplayMode windowDisplayMode;
@@ -328,7 +323,7 @@ public class LwjglRenderModule extends RenderModule {
 		// texture is loaded uniquely -> can compare with ==
 		if (activeTexture != txquad.tx) {
 			glEnable(GL_TEXTURE_2D);
-			activeTexture = txquad.tx;
+			activeTexture = (SlickTexture) txquad.tx;
 			activeTexture.bind();
 		}
 		
@@ -355,8 +350,8 @@ public class LwjglRenderModule extends RenderModule {
 			tR = swap;
 		}
 		
-		final double w = txquad.tx.getWidth01();
-		final double h = txquad.tx.getHeight01();
+		final double w = activeTexture.getWidth01();
+		final double h = activeTexture.getHeight01();
 		
 		// quad with texture
 		glTexCoord2d(tL * w, tB * h);
@@ -409,9 +404,9 @@ public class LwjglRenderModule extends RenderModule {
 	
 	
 	@Override
-	public LazyTexture getLazyTexture(String path)
+	public DeferredTexture getLazyTexture(String path)
 	{
-		return new SlickLazyTexture(path);
+		return new SlickTexture(path);
 	}
 	
 	
@@ -444,7 +439,7 @@ public class LwjglRenderModule extends RenderModule {
 				fullscreenSetRequested = false;
 			}
 			
-			getEventBus().send(new DisplayReadyEvent());
+			App.bus().send(new DisplayReadyEvent());
 			
 		} catch (final Exception e) {
 			throw new RuntimeException("Could not initialize display.", e);
@@ -500,7 +495,7 @@ public class LwjglRenderModule extends RenderModule {
 				Display.update();
 			}
 			
-			getEventBus().send(new ViewportChangeEvent(getSize()));
+			App.bus().send(new ViewportChangeEvent(getSize()));
 			
 		} catch (final Throwable t) {
 			Log.e("Failed to change fullscreen mode.", t);
@@ -542,7 +537,7 @@ public class LwjglRenderModule extends RenderModule {
 	{
 		// handle resize
 		if (Display.wasResized()) {
-			getEventBus().send(new ViewportChangeEvent(getSize()));
+			App.bus().send(new ViewportChangeEvent(getSize()));
 		}
 		
 		if (fullscreenToggleRequested) {

src/mightypork/gamecore/backend/lwjgl/SlickAudio.java

@@ -0,0 +1,171 @@
+package mightypork.gamecore.backend.lwjgl;
+
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import mightypork.gamecore.resources.audio.DeferredAudio;
+import mightypork.gamecore.resources.audio.SoundSystem;
+import mightypork.utils.files.FileUtils;
+import mightypork.utils.math.constraints.vect.Vect;
+
+import org.lwjgl.openal.AL10;
+import org.newdawn.slick.openal.Audio;
+import org.newdawn.slick.openal.SoundStore;
+
+
+/**
+ * SlickUtil-based deferred audio resource.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class SlickAudio extends DeferredAudio {
+	
+	private double pauseLoopPosition = 0;
+	private boolean looping = false;
+	private boolean paused = false;
+	private double lastPlayPitch = 1;
+	private double lastPlayGain = 1;
+	
+	/** Audio resource */
+	private Audio backingAudio = null;
+	private int sourceID;
+	
+	
+	public SlickAudio(String resourceName) {
+		super(resourceName);
+	}
+	
+	
+	@Override
+	protected void loadResource(String resource) throws IOException
+	{
+		final String ext = FileUtils.getExtension(resource);
+		
+		try (final InputStream stream = FileUtils.getResource(resource)) {
+			
+			if (ext.equalsIgnoreCase("ogg")) {
+				backingAudio = SoundStore.get().getOgg(resource, stream);
+				
+			} else if (ext.equalsIgnoreCase("wav")) {
+				backingAudio = SoundStore.get().getWAV(resource, stream);
+				
+			} else if (ext.equalsIgnoreCase("aif")) {
+				backingAudio = SoundStore.get().getAIF(resource, stream);
+				
+			} else if (ext.equalsIgnoreCase("mod")) {
+				backingAudio = SoundStore.get().getMOD(resource, stream);
+				
+			} else {
+				throw new RuntimeException("Invalid audio file extension.");
+			}
+		}
+	}
+	
+	
+	@Override
+	public void pauseLoop()
+	{
+		if (!ensureLoaded()) return;
+		
+		if (isPlaying() && looping) {
+			pauseLoopPosition = backingAudio.getPosition();
+			stop();
+			paused = true;
+		}
+	}
+	
+	
+	@Override
+	public void resumeLoop()
+	{
+		if (!ensureLoaded()) return;
+		
+		if (looping && paused) {
+			sourceID = backingAudio.playAsSoundEffect((float) lastPlayPitch, (float) lastPlayGain, true);
+			backingAudio.setPosition((float) pauseLoopPosition);
+			paused = false;
+		}
+	}
+	
+	
+	@Override
+	public void adjustGain(double gain)
+	{
+		AL10.alSourcef(sourceID, AL10.AL_GAIN, (float) gain);
+	}
+	
+	
+	@Override
+	public void stop()
+	{
+		if (!isLoaded()) return;
+		
+		backingAudio.stop();
+		paused = false;
+	}
+	
+	
+	@Override
+	public boolean isPlaying()
+	{
+		if (!isLoaded()) return false;
+		
+		return backingAudio.isPlaying();
+	}
+	
+	
+	@Override
+	public boolean isPaused()
+	{
+		if (!isLoaded()) return false;
+		
+		return backingAudio.isPaused();
+	}
+	
+	
+	@Override
+	public void play(double pitch, double gain, boolean loop)
+	{
+		play(pitch, gain, loop, SoundSystem.getListener());
+	}
+	
+	
+	@Override
+	public void play(double pitch, double gain, boolean loop, double x, double y)
+	{
+		play(pitch, gain, loop, x, y, SoundSystem.getListener().z());
+	}
+	
+	
+	@Override
+	public void play(double pitch, double gain, boolean loop, double x, double y, double z)
+	{
+		if (!ensureLoaded()) return;
+		
+		this.lastPlayPitch = pitch;
+		this.lastPlayGain = gain;
+		looping = loop;
+		
+		sourceID = backingAudio.playAsSoundEffect((float) pitch, (float) gain, loop, (float) x, (float) y, (float) z);
+	}
+	
+	
+	@Override
+	public void play(double pitch, double gain, boolean loop, Vect pos)
+	{
+		if (!ensureLoaded()) return;
+		
+		play(pitch, gain, loop, pos.x(), pos.y(), pos.z());
+	}
+	
+	
+	@Override
+	public void destroy()
+	{
+		if (!isLoaded() || backingAudio == null) return;
+		
+		backingAudio.release();
+		backingAudio = null;
+	}
+}

src/mightypork/gamecore/backend/lwjgl/SlickAudioModule.java

@@ -0,0 +1,91 @@
+package mightypork.gamecore.backend.lwjgl;
+
+
+import java.nio.FloatBuffer;
+
+import org.lwjgl.openal.AL;
+import org.lwjgl.openal.AL10;
+import org.newdawn.slick.openal.SoundStore;
+
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.resources.audio.AudioModule;
+import mightypork.gamecore.resources.audio.AudioReadyEvent;
+import mightypork.gamecore.resources.audio.DeferredAudio;
+import mightypork.gamecore.util.BufferHelper;
+import mightypork.utils.logging.Log;
+import mightypork.utils.math.constraints.vect.Vect;
+import mightypork.utils.math.constraints.vect.var.VectVar;
+
+
+/**
+ * SlickUtil-based audio module
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class SlickAudioModule extends AudioModule {
+	
+	private static final Vect INITIAL_LISTENER_POS = Vect.ZERO;
+	private static final int MAX_SOURCES = 256;
+	
+	private VectVar listener = Vect.makeVar();
+	private static boolean soundSystemInited = false;
+	
+	
+	public SlickAudioModule() {
+		
+		if (!soundSystemInited) {
+			soundSystemInited = true;
+			
+			try {
+				SoundStore.get().setMaxSources(MAX_SOURCES);
+				SoundStore.get().init();
+				setListenerPos(INITIAL_LISTENER_POS);
+				
+				App.bus().send(new AudioReadyEvent());
+			} catch (final Throwable t) {
+				Log.e("Error initializing sound system.", t);
+			}
+		}
+	}
+	
+	
+	@Override
+	public void setListenerPos(Vect pos)
+	{
+		listener.setTo(pos);
+		final FloatBuffer buf3 = BufferHelper.alloc(3);
+		final FloatBuffer buf6 = BufferHelper.alloc(6);
+		buf3.clear();
+		BufferHelper.fill(buf3, (float) pos.x(), (float) pos.y(), (float) pos.z());
+		AL10.alListener(AL10.AL_POSITION, buf3);
+		buf3.clear();
+		BufferHelper.fill(buf3, 0, 0, 0);
+		AL10.alListener(AL10.AL_VELOCITY, buf3);
+		buf6.clear();
+		BufferHelper.fill(buf6, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f);
+		AL10.alListener(AL10.AL_ORIENTATION, buf6);
+	}
+	
+	
+	@Override
+	public Vect getListenerPos()
+	{
+		return listener;
+	}
+	
+	
+	@Override
+	protected void deinitSoundSystem()
+	{
+		SoundStore.get().clear();
+		AL.destroy();
+	}
+	
+	
+	@Override
+	protected DeferredAudio doCreateResource(String res)
+	{
+		return new SlickAudio(res);
+	}
+	
+}

src/mightypork/gamecore/backend/lwjgl/SlickTexture.java

@@ -3,9 +3,10 @@ package mightypork.gamecore.backend.lwjgl;
 
 import java.io.IOException;
 
-import mightypork.gamecore.resources.TextureBasedResource;
-import mightypork.gamecore.resources.textures.LazyTexture;
+import mightypork.gamecore.resources.MustLoadInRenderingContext;
+import mightypork.gamecore.resources.textures.DeferredTexture;
 import mightypork.utils.annotations.Alias;
+import mightypork.utils.exceptions.IllegalValueException;
 import mightypork.utils.files.FileUtils;
 import mightypork.utils.logging.Log;
 
@@ -20,8 +21,8 @@ import org.newdawn.slick.opengl.TextureLoader;
  * @author Ondřej Hruška (MightyPork)
  */
 @Alias(name = "Texture")
-@TextureBasedResource
-public class SlickLazyTexture extends LazyTexture {
+@MustLoadInRenderingContext
+public class SlickTexture extends DeferredTexture {
 	
 	private org.newdawn.slick.opengl.Texture backingTexture;
 	private boolean alpha;
@@ -31,7 +32,7 @@ public class SlickLazyTexture extends LazyTexture {
 	/**
 	 * @param resourcePath resource path
 	 */
-	public SlickLazyTexture(String resourcePath) {
+	public SlickTexture(String resourcePath) {
 		super(resourcePath);
 	}
 	
@@ -42,7 +43,19 @@ public class SlickLazyTexture extends LazyTexture {
 		try {
 			final String ext = FileUtils.getExtension(path).toUpperCase();
 			
-			final Texture texture = TextureLoader.getTexture(ext, FileUtils.getResource(path), false, filter.num);
+			final int filtering;
+			switch (filter) {
+				case NEAREST:
+					filtering = GL11.GL_NEAREST;
+					break;
+				case LINEAR:
+					filtering = GL11.GL_LINEAR;
+					break;
+				default:
+					throw new IllegalValueException("Unsupported filtering mode.");
+			}
+			
+			final Texture texture = TextureLoader.getTexture(ext, FileUtils.getResource(path), false, filtering);
 			
 			if (texture == null) {
 				Log.w("Texture " + path + " could not be loaded.");
@@ -71,7 +84,9 @@ public class SlickLazyTexture extends LazyTexture {
 	}
 	
 	
-	@Override
+	/**
+	 * Bind to GL context, applying the filters prescribed.
+	 */
 	public void bind()
 	{
 		if (!ensureLoaded()) return;
@@ -82,11 +97,35 @@ public class SlickLazyTexture extends LazyTexture {
 		
 		GL11.glTexEnvf(GL11.GL_TEXTURE_ENV, GL11.GL_TEXTURE_ENV_MODE, GL11.GL_MODULATE);
 		
-		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, wrap.num);
-		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, wrap.num);
+		final int wrapping;
+		switch (wrap) {
+			case CLAMP:
+				wrapping = GL11.GL_CLAMP;
+				break;
+			case REPEAT:
+				wrapping = GL11.GL_REPEAT;
+				break;
+			default:
+				throw new IllegalValueException("Unsupported wrapping mode.");
+		}
 		
-		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, filter.num);
-		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, filter.num);
+		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, wrapping);
+		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, wrapping);
+		
+		final int filtering;
+		switch (filter) {
+			case NEAREST:
+				filtering = GL11.GL_NEAREST;
+				break;
+			case LINEAR:
+				filtering = GL11.GL_LINEAR;
+				break;
+			default:
+				throw new IllegalValueException("Unsupported filtering mode.");
+		}
+		
+		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, filtering);
+		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, filtering);
 	}
 	
 	
@@ -108,24 +147,6 @@ public class SlickLazyTexture extends LazyTexture {
 	}
 	
 	
-	@Override
-	public float getHeight01()
-	{
-		if (!ensureLoaded()) return 0;
-		
-		return backingTexture.getHeight();
-	}
-	
-	
-	@Override
-	public float getWidth01()
-	{
-		if (!ensureLoaded()) return 0;
-		
-		return backingTexture.getWidth();
-	}
-	
-	
 	@Override
 	public void destroy()
 	{
@@ -135,7 +156,35 @@ public class SlickLazyTexture extends LazyTexture {
 	}
 	
 	
-	@Override
+	/**
+	 * Get the height of the texture, 0..1.<br>
+	 * 
+	 * @return height 0..1
+	 */
+	public float getHeight01()
+	{
+		if (!ensureLoaded()) return 0;
+		
+		return backingTexture.getHeight();
+	}
+	
+	
+	/**
+	 * Get the width of the texture, 0..1.<br>
+	 * 
+	 * @return width 0..1
+	 */
+	public float getWidth01()
+	{
+		if (!ensureLoaded()) return 0;
+		
+		return backingTexture.getWidth();
+	}
+	
+	
+	/**
+	 * @return OpenGL texture ID
+	 */
 	public int getTextureID()
 	{
 		if (!ensureLoaded()) return -1;

src/mightypork/gamecore/core/WorkDir.java

@@ -15,26 +15,6 @@ import mightypork.utils.logging.Log;
  */
 public class WorkDir {
 	
-	/**
-	 * Route configurator.
-	 */
-	public static interface RouteSetup {
-		
-		public void addRoutes(RouteOpts routeOpts);
-	}
-	
-	/**
-	 * Route configurator access
-	 */
-	public static class RouteOpts {
-		
-		public void addPath(String alias, String path)
-		{
-			WorkDir.addPath(alias, path);
-		}
-	}
-	
-	public static RouteOpts routeOpts = new RouteOpts();
 	private static File workdir;
 	private static Map<String, String> namedPaths = new HashMap<>();
 	
@@ -46,7 +26,7 @@ public class WorkDir {
 	
 	
 	/**
-	 * Add a path alias (dir or file)
+	 * Add a path alias (dir or file), relative to the workdir.
 	 * 
 	 * @param alias path alias
 	 * @param path path relative to workdir
@@ -57,12 +37,6 @@ public class WorkDir {
 	}
 	
 	
-	public static void registerRoutes(RouteSetup rs)
-	{
-		rs.addRoutes(routeOpts);
-	}
-	
-	
 	/**
 	 * Get workdir folder, create if not exists.
 	 * 

src/mightypork/gamecore/core/config/Config.java

@@ -6,6 +6,7 @@ import java.util.HashMap;
 import java.util.Map;
 
 import mightypork.gamecore.input.KeyStroke;
+import mightypork.utils.files.config.Property;
 import mightypork.utils.files.config.PropertyManager;
 import mightypork.utils.logging.Log;
 
@@ -17,45 +18,101 @@ import mightypork.utils.logging.Log;
  */
 public class Config {
 	
-	public static KeyOpts keyOpts = new KeyOpts();
-	public static Map<String, KeyProperty> strokes = new HashMap<>();
+	private static Map<String, KeyProperty> strokes = new HashMap<>();
 	
-	static PropertyManager cfg;
+	private static PropertyManager propertyManager;
 	
 	
 	/**
 	 * Initialize property manger for a file
 	 * 
 	 * @param file config file
-	 * @param comment file comment
+	 * @param headComment file comment
 	 */
-	public static void init(File file, String comment)
+	public static void init(File file, String headComment)
 	{
-		cfg = new PropertyManager(file, comment);
-		cfg.cfgNewlineBeforeComments(true);
-		cfg.cfgSeparateSections(true);
+		propertyManager = new PropertyManager(file, headComment);
+		
+		propertyManager.cfgNewlineBeforeComments(true);
+		propertyManager.cfgSeparateSections(true);
 	}
 	
 	
 	/**
-	 * populate config with keys from a key setup
+	 * Add a keystroke property
 	 * 
-	 * @param keys key setup to add
+	 * @param key key in config file
+	 * @param defval default value (keystroke datastring)
+	 * @param comment optional comment, can be null
 	 */
-	public static void registerKeys(KeySetup keys)
+	public void addKeyProperty(String key, String defval, String comment)
 	{
-		keys.addKeys(Config.keyOpts);
+		final KeyProperty kprop = new KeyProperty(Config.prefixKey(key), KeyStroke.createFromDataString(defval), comment);
+		strokes.put(Config.prefixKey(key), kprop);
+		propertyManager.putProperty(kprop);
 	}
 	
 	
 	/**
-	 * Populate config with options from a config setup
+	 * Add a boolean property (flag)
 	 * 
-	 * @param conf config setup to add
+	 * @param key key in config file
+	 * @param defval default value
+	 * @param comment optional comment, can be null
 	 */
-	public static void registerOptions(ConfigSetup conf)
+	public void addBooleanProperty(String key, boolean defval, String comment)
 	{
-		conf.addOptions(Config.cfg);
+		propertyManager.putBoolean(key, defval, comment);
+	}
+	
+	
+	/**
+	 * Add an integer property
+	 * 
+	 * @param key key in config file
+	 * @param defval default value
+	 * @param comment optional comment, can be null
+	 */
+	public void addIntegerProperty(String key, int defval, String comment)
+	{
+		propertyManager.putInteger(key, defval, comment);
+	}
+	
+	
+	/**
+	 * Add a double property
+	 * 
+	 * @param key key in config file
+	 * @param defval default value
+	 * @param comment optional comment, can be null
+	 */
+	public void addDoubleProperty(String key, double defval, String comment)
+	{
+		propertyManager.putDouble(key, defval, comment);
+	}
+	
+	
+	/**
+	 * Add a string property
+	 * 
+	 * @param key key in config file
+	 * @param defval default value
+	 * @param comment optional comment, can be null
+	 */
+	public void addStringProperty(String key, String defval, String comment)
+	{
+		propertyManager.putString(key, defval, comment);
+	}
+	
+	
+	/**
+	 * Add an arbitrary property (can be custom type)
+	 * 
+	 * @param prop the property to add
+	 */
+	public <T> void addProperty(Property<T> prop)
+	{
+		propertyManager.putProperty(prop);
 	}
 	
 	
@@ -64,7 +121,7 @@ public class Config {
 	 */
 	public static void load()
 	{
-		cfg.load();
+		propertyManager.load();
 	}
 	
 	
@@ -74,7 +131,7 @@ public class Config {
 	public static void save()
 	{
 		Log.f3("Saving config.");
-		cfg.save();
+		propertyManager.save();
 	}
 	
 	
@@ -87,11 +144,11 @@ public class Config {
 	public static <T> T getValue(String key)
 	{
 		try {
-			if (cfg.getProperty(key) == null) {
+			if (propertyManager.getProperty(key) == null) {
 				throw new IllegalArgumentException("No such property: " + key);
 			}
 			
-			return cfg.getValue(key);
+			return propertyManager.getValue(key);
 		} catch (final ClassCastException cce) {
 			throw new RuntimeException("Property of incompatible type: " + key);
 		}
@@ -99,18 +156,19 @@ public class Config {
 	
 	
 	/**
-	 * Set option to a value
+	 * Set option to a value. Call the save() method to make the change
+	 * permanent.
 	 * 
 	 * @param key option key
 	 * @param value value to set
 	 */
 	public static <T> void setValue(String key, T value)
 	{
-		if (cfg.getProperty(key) == null) {
+		if (propertyManager.getProperty(key) == null) {
 			throw new IllegalArgumentException("No such property: " + key);
 		}
 		
-		cfg.setValue(key, value);
+		propertyManager.setValue(key, value);
 	}
 	
 	
@@ -120,7 +178,7 @@ public class Config {
 	 * @param cfgKey config key
 	 * @return key. + cfgKey
 	 */
-	static String prefixKey(String cfgKey)
+	private static String prefixKey(String cfgKey)
 	{
 		return "key." + cfgKey;
 	}

src/mightypork/gamecore/core/config/ConfigSetup.java

@@ -1,13 +0,0 @@
-package mightypork.gamecore.core.config;
-
-
-import mightypork.utils.files.config.PropertyManager;
-
-
-/**
- * Config setup, class used to populate the config file.
- */
-public interface ConfigSetup {
-	
-	void addOptions(PropertyManager prop);
-}

src/mightypork/gamecore/core/config/KeyOpts.java

@@ -1,30 +0,0 @@
-package mightypork.gamecore.core.config;
-
-
-import mightypork.gamecore.input.KeyStroke;
-
-
-/**
- * Key options - restricted access to {@link Config} for keys
- */
-public class KeyOpts {
-	
-	public void add(String cfgKey, String dataString)
-	{
-		add(cfgKey, dataString, null);
-	}
-	
-	
-	/**
-	 * @param cfgKey key in config file
-	 * @param dataString string representing the keystroke (format for
-	 *            {@link KeyStroke})
-	 * @param comment optional comment
-	 */
-	public void add(String cfgKey, String dataString, String comment)
-	{
-		final KeyProperty kprop = new KeyProperty(Config.prefixKey(cfgKey), KeyStroke.createFromDataString(dataString), comment);
-		Config.strokes.put(Config.prefixKey(cfgKey), kprop);
-		Config.cfg.putProperty(kprop);
-	}
-}

src/mightypork/gamecore/core/config/KeySetup.java

@@ -1,10 +0,0 @@
-package mightypork.gamecore.core.config;
-
-
-/**
- * Key configurator. Config access restricted to key options.
- */
-public interface KeySetup {
-	
-	public void addKeys(KeyOpts keys);
-}

src/mightypork/gamecore/core/events/MainLoopRequest.java

@@ -18,6 +18,14 @@ public class MainLoopRequest extends BusEvent<MainLoop> {
 	private final boolean priority;
 	
 	
+	/**
+	 * @param task task to run on main thread in rendering context
+	 */
+	public MainLoopRequest(Runnable task) {
+		this(task, false);
+	}
+	
+	
 	/**
 	 * @param task task to run on main thread in rendering context
 	 * @param priority if true, skip other tasks in queue

src/mightypork/gamecore/core/events/ShudownRequest.java

@@ -1,6 +1,7 @@
 package mightypork.gamecore.core.events;
 
 
+import mightypork.gamecore.core.modules.App;
 import mightypork.gamecore.core.modules.MainLoop;
 import mightypork.utils.eventbus.BusEvent;
 import mightypork.utils.eventbus.events.flags.NonConsumableEvent;
@@ -25,7 +26,7 @@ public class ShudownRequest extends BusEvent<MainLoop> {
 			@Override
 			public void run()
 			{
-				handler.shutdown();
+				App.shutdown();
 			}
 		}, true);
 	}

src/mightypork/gamecore/core/modules/App.java

@@ -1,8 +1,26 @@
 package mightypork.gamecore.core.modules;
 
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
 import mightypork.gamecore.backend.Backend;
-import mightypork.gamecore.render.RenderModule;
+import mightypork.gamecore.initializers.InitTask;
+import mightypork.gamecore.initializers.InitTaskResolver;
+import mightypork.gamecore.plugins.AppPlugin;
+import mightypork.gamecore.render.GraphicsModule;
+import mightypork.gamecore.resources.audio.AudioModule;
+import mightypork.utils.MapSort;
+import mightypork.utils.Support;
+import mightypork.utils.annotations.Stub;
+import mightypork.utils.eventbus.EventBus;
+import mightypork.utils.eventbus.clients.BusNode;
+import mightypork.utils.eventbus.clients.DelegatingList;
+import mightypork.utils.eventbus.events.DestroyEvent;
+import mightypork.utils.logging.Log;
 
 
 /**
@@ -10,53 +28,78 @@ import mightypork.gamecore.render.RenderModule;
  * 
  * @author MightyPork
  */
-public class App {
+public class App extends BusNode {
 	
 	private static App runningInstance;
-	private static Backend backend;
+	
+	protected final Backend backend;
+	protected final EventBus eventBus;
+	protected boolean started = false;
+	
+	protected final DelegatingList plugins;
+	protected final List<InitTask> initializers = new ArrayList<>();
 	
 	
-	public App() {
-		if (App.isInitialized()) throw new IllegalStateException("App already initialized");
+	/**
+	 * Create an app with given backend.
+	 * 
+	 * @param backend
+	 */
+	public App(Backend backend) {
+		if (App.runningInstance != null) {
+			throw new IllegalStateException("App already initialized");
+		}
 		
 		// store current instance in static field
 		App.runningInstance = this;
-	}
-	
-	
-	/**
-	 * Create app with given backend.
-	 * 
-	 * @param backend backend to use
-	 */
-	public void setBackend(Backend backend)
-	{
-		// store used backend in static field
-		App.backend = backend;
 		
-		// initialize the backend
-		App.backend.initialize();
+		// create an event bus
+		this.eventBus = new EventBus();
+		
+		// join the bus
+		this.eventBus.subscribe(this);
+		
+		// create plugin registry attached to bus
+		this.plugins = new DelegatingList();
+		this.eventBus.subscribe(this.plugins);
+		
+		// initialize and use backend
+		this.backend = backend;
+		this.eventBus.subscribe(backend);
+		this.backend.initialize();
 	}
 	
 	
 	/**
-	 * Throw error if app is not initialized
-	 */
-	protected static void assertInitialized()
-	{
-		if (!App.isInitialized()) throw new IllegalStateException("App is not initialized.");
-		if (backend == null) throw new IllegalStateException("No backend set!");
-	}
-	
-	
-	/**
-	 * Check whether the app is initialized (backend assigned).
+	 * Add a plugin to the app. Plugins can eg. listen to bus events and react
+	 * to them.
 	 * 
-	 * @return is initialized
+	 * @param plugin the added plugin.
 	 */
-	public static boolean isInitialized()
+	public void addPlugin(AppPlugin plugin)
 	{
-		return runningInstance != null;
+		if (started) {
+			throw new IllegalStateException("App already started, cannot add plugins.");
+		}
+		
+		plugin.initialize(this);
+		plugins.add(plugin);
+	}
+	
+	
+	/**
+	 * Add an initializer to the app.
+	 * 
+	 * @param order
+	 * @param initializer
+	 */
+	public void addInitializer(InitTask initializer)
+	{
+		if (started) {
+			throw new IllegalStateException("App already started, cannot add initializers.");
+		}
+		
+		initializers.add(initializer);
 	}
 	
 	
@@ -65,21 +108,115 @@ public class App {
 	 * 
 	 * @return the backend
 	 */
-	public static Backend getBackend()
+	public Backend getBackend()
 	{
-		assertInitialized();
 		return backend;
 	}
 	
 	
 	/**
-	 * Get renderer instance from the backend
+	 * Initialize the App and start operating.<br>
+	 * This method should be called after adding all required initializers and
+	 * plugins.
+	 */
+	public final void start()
+	{
+		if (started) {
+			throw new IllegalStateException("Already started.");
+		}
+		started = true;
+		
+		// pre-init hook, just in case anyone wanted to have one.
+		Log.f2("Calling pre-init hook...");
+		preInit();
+		
+		Log.i("=== Starting initialization sequence ===");
+		
+		// sort initializers by order.
+		List<InitTask> orderedInitializers = InitTaskResolver.order(initializers);
+		
+		for (InitTask initializer : orderedInitializers) {
+			Log.f1("Running init task \"" + initializer.getName() + "\"...");
+			initializer.run(this);
+		}
+		
+		Log.i("=== Initialization sequence completed ===");
+		
+		// user can now start the main loop etc.
+		Log.f2("Calling post-init hook...");
+		postInit();
+	}
+	
+	
+	/**
+	 * Hook called before the initialization sequence starts.
+	 */
+	@Stub
+	protected void preInit()
+	{
+	}
+	
+	
+	/**
+	 * Hook called after the initialization sequence is finished.
+	 */
+	@Stub
+	protected void postInit()
+	{
+	}
+	
+	
+	public static void shutdown()
+	{
+		if (runningInstance == null) throw new IllegalStateException("App is not running.");
+		
+		Log.i("Shutting down subsystems...");
+		
+		// TODO send some shutdown notify event
+		
+		try {
+			if (bus() != null) {
+				bus().send(new DestroyEvent());
+				bus().destroy();
+			}
+		} catch (final Throwable e) {
+			Log.e(e);
+		}
+		
+		Log.i("App terminated.");
+		System.exit(0);
+	}
+	
+	
+	/**
+	 * Get graphics module from the backend
 	 * 
 	 * @return backend
 	 */
-	public static RenderModule gfx()
+	public static GraphicsModule gfx()
 	{
-		assertInitialized();
-		return backend.getRenderer();
+		return runningInstance.backend.getGraphics();
+	}
+	
+	
+	/**
+	 * Get audio module from the backend
+	 * 
+	 * @return backend
+	 */
+	public static AudioModule audio()
+	{
+		return runningInstance.backend.getAudio();
+	}
+	
+	
+	/**
+	 * Get event bus instance.
+	 * 
+	 * @return event bus
+	 */
+	public static EventBus bus()
+	{
+		return runningInstance.eventBus;
 	}
 }

src/mightypork/gamecore/core/modules/AppAccess.java

@@ -1,34 +0,0 @@
-package mightypork.gamecore.core.modules;
-
-
-import mightypork.gamecore.input.InputSystem;
-import mightypork.gamecore.resources.audio.SoundSystem;
-import mightypork.utils.eventbus.BusAccess;
-
-
-/**
- * App interface visible to subsystems
- * 
- * @author Ondřej Hruška (MightyPork)
- */
-public interface AppAccess extends BusAccess {
-	
-	/**
-	 * @return sound system
-	 */
-	abstract SoundSystem getSoundSystem();
-	
-	
-	/**
-	 * @return input system
-	 */
-	abstract InputSystem getInput();
-	
-	
-	/**
-	 * Quit to OS<br>
-	 * Destroy app & exit VM
-	 */
-	abstract void shutdown();
-	
-}

src/mightypork/gamecore/core/modules/AppAccessAdapter.java

@@ -1,56 +0,0 @@
-package mightypork.gamecore.core.modules;
-
-
-import mightypork.gamecore.input.InputSystem;
-import mightypork.gamecore.resources.audio.SoundSystem;
-import mightypork.utils.eventbus.EventBus;
-
-
-/**
- * App access adapter (defualt {@link AppAccess} implementation)
- * 
- * @author Ondřej Hruška (MightyPork)
- */
-public class AppAccessAdapter implements AppAccess {
-	
-	private final AppAccess app;
-	
-	
-	/**
-	 * @param app app access
-	 */
-	public AppAccessAdapter(AppAccess app) {
-		if (app == null) throw new NullPointerException("AppAccess instance cannot be null.");
-		
-		this.app = app;
-	}
-	
-	
-	@Override
-	public final SoundSystem getSoundSystem()
-	{
-		return app.getSoundSystem();
-	}
-	
-	
-	@Override
-	public final InputSystem getInput()
-	{
-		return app.getInput();
-	}
-	
-	
-	@Override
-	public final EventBus getEventBus()
-	{
-		return app.getEventBus();
-	}
-	
-	
-	@Override
-	public final void shutdown()
-	{
-		app.shutdown();
-	}
-	
-}

src/mightypork/gamecore/core/modules/AppInitOptions.java

@@ -7,7 +7,6 @@ import java.util.List;
 import java.util.logging.Level;
 
 import mightypork.gamecore.backend.Backend;
-import mightypork.gamecore.core.WorkDir.RouteSetup;
 import mightypork.gamecore.core.config.ConfigSetup;
 import mightypork.gamecore.core.config.KeySetup;
 import mightypork.gamecore.resources.AsyncResourceLoader;
@@ -20,28 +19,19 @@ import mightypork.gamecore.resources.ResourceSetup;
  */
 public class AppInitOptions {
 	
-	boolean singleInstance = false;
-	
-	Backend backend = null;
-	File workdir = null;
-	
 	String logDir = "log";
 	String logFilePrefix = "runtime";
 	
 	String screenshotDir = "screenshots";
 	
-	int logArchiveCount = 0;
 	boolean busLogging = false;
 	
 	String configFile = "settings.cfg";
 	String configComment = "Main config file";
 	
-	public String lockFile = ".lock";
-	
 	final List<ResourceSetup> resourceLists = new ArrayList<>();
 	final List<KeySetup> keyLists = new ArrayList<>();
 	final List<ConfigSetup> configLists = new ArrayList<>();
-	final List<RouteSetup> routeLists = new ArrayList<>();
 	
 	ResourceLoader resourceLoader = new AsyncResourceLoader();
 	Level logLevel = Level.ALL;
@@ -68,12 +58,6 @@ public class AppInitOptions {
 	}
 	
 	
-	public void addRoutes(RouteSetup keys)
-	{
-		routeLists.add(keys);
-	}
-	
-	
 	public void addResources(ResourceSetup res)
 	{
 		resourceLists.add(res);

src/mightypork/gamecore/core/modules/AppModule.java

@@ -1,52 +0,0 @@
-package mightypork.gamecore.core.modules;
-
-
-import mightypork.gamecore.input.InputSystem;
-import mightypork.gamecore.resources.audio.SoundSystem;
-import mightypork.utils.eventbus.clients.RootBusNode;
-
-
-/**
- * App event bus client, to be used for subsystems, screens and anything that
- * needs access to the eventbus and other systems; Attached directly to bus.
- * 
- * @author Ondřej Hruška (MightyPork)
- */
-public abstract class AppModule extends RootBusNode implements AppAccess {
-	
-	private final AppAccess app;
-	
-	
-	/**
-	 * Create a module
-	 * 
-	 * @param app access to app systems
-	 */
-	public AppModule(AppAccess app) {
-		super(app);
-		
-		this.app = app;
-	}
-	
-	
-	@Override
-	public final SoundSystem getSoundSystem()
-	{
-		return app.getSoundSystem();
-	}
-	
-	
-	@Override
-	public final InputSystem getInput()
-	{
-		return app.getInput();
-	}
-	
-	
-	@Override
-	public final void shutdown()
-	{
-		app.shutdown();
-	}
-	
-}

src/mightypork/gamecore/core/modules/AppSubModule.java

@@ -1,54 +0,0 @@
-package mightypork.gamecore.core.modules;
-
-
-import mightypork.gamecore.input.InputSystem;
-import mightypork.gamecore.resources.audio.SoundSystem;
-import mightypork.utils.eventbus.clients.BusNode;
-import mightypork.utils.eventbus.clients.DelegatingClient;
-import mightypork.utils.eventbus.clients.RootBusNode;
-
-
-/**
- * Delegating bus client, to be attached to any {@link DelegatingClient}, such
- * as a {@link RootBusNode}.
- * 
- * @author Ondřej Hruška (MightyPork)
- */
-public class AppSubModule extends BusNode implements AppAccess {
-	
-	private final AppAccess app;
-	
-	
-	/**
-	 * Create submodule
-	 * 
-	 * @param app access to app systems
-	 */
-	public AppSubModule(AppAccess app) {
-		super(app);
-		
-		this.app = app;
-	}
-	
-	
-	@Override
-	public final SoundSystem getSoundSystem()
-	{
-		return app.getSoundSystem();
-	}
-	
-	
-	@Override
-	public final InputSystem getInput()
-	{
-		return app.getInput();
-	}
-	
-	
-	@Override
-	public final void shutdown()
-	{
-		app.shutdown();
-	}
-	
-}

src/mightypork/gamecore/core/modules/BaseApp.java

@@ -1,12 +1,8 @@
 package mightypork.gamecore.core.modules;
 
 
-import java.io.File;
-import java.io.IOException;
 import java.lang.Thread.UncaughtExceptionHandler;
 
-import javax.swing.JOptionPane;
-
 import mightypork.gamecore.backend.Backend;
 import mightypork.gamecore.core.WorkDir;
 import mightypork.gamecore.core.WorkDir.RouteSetup;
@@ -16,23 +12,10 @@ import mightypork.gamecore.core.config.KeySetup;
 import mightypork.gamecore.gui.screens.ScreenRegistry;
 import mightypork.gamecore.gui.screens.impl.CrossfadeOverlay;
 import mightypork.gamecore.input.InputSystem;
-import mightypork.gamecore.render.RenderModule;
 import mightypork.gamecore.resources.Res;
 import mightypork.gamecore.resources.ResourceSetup;
 import mightypork.gamecore.resources.audio.SoundSystem;
-import mightypork.gamecore.util.SlickLogRedirector;
-import mightypork.utils.annotations.Stub;
-import mightypork.utils.eventbus.EventBus;
-import mightypork.utils.eventbus.events.DestroyEvent;
-import mightypork.utils.files.InstanceLock;
-import mightypork.utils.ion.Ion;
-import mightypork.utils.ion.IonInput;
-import mightypork.utils.ion.IonOutput;
-import mightypork.utils.ion.IonizerBinary;
 import mightypork.utils.logging.Log;
-import mightypork.utils.logging.writers.LogWriter;
-import mightypork.utils.math.algo.Coord;
-import mightypork.utils.math.algo.Move;
 
 
 /**
@@ -41,14 +24,12 @@ import mightypork.utils.math.algo.Move;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public abstract class BaseApp extends App implements AppAccess, UncaughtExceptionHandler {
+public abstract class BaseApp extends App implements UncaughtExceptionHandler {
 	
 	// modules
-	private InputSystem inputSystem;
-	private SoundSystem soundSystem;
-	private EventBus eventBus;
 	private MainLoop gameLoop;
 	private ScreenRegistry screenRegistry;
+	
 	private boolean started = false;
 	private boolean lockObtained = false;
 	
@@ -72,25 +53,21 @@ public abstract class BaseApp extends App implements AppAccess, UncaughtExceptio
 	
 	
 	public BaseApp(Backend backend) {
-		
-		eventBus = new EventBus();
-		setBackend(backend);
-		backend.setBusAccess(this);
+		super(backend);
 	}
 	
 	
 	/**
 	 * Start the application
 	 */
+	@Override
 	public final void start()
 	{
-		Thread.setDefaultUncaughtExceptionHandler(this);
-		
 		initialize();
 		
 		Log.i("Starting main loop...");
 		
-		// open first screen	
+		// open first screen	!!!
 		started = true;
 		gameLoop.start();
 	}
@@ -125,38 +102,6 @@ public abstract class BaseApp extends App implements AppAccess, UncaughtExceptio
 		}
 		Config.load();
 		
-		/*
-		 * Setup logging
-		 */
-		final LogWriter log = Log.create(opt.logFilePrefix, new File(WorkDir.getDir(opt.logDir), opt.logFilePrefix + ".log"), opt.logArchiveCount);
-		Log.setMainLogger(log);
-		Log.setLevel(opt.logLevel);
-		Log.setSysoutLevel(opt.logSoutLevel);
-		
-		// connect slickutil to the logger
-		org.newdawn.slick.util.Log.setLogSystem(new SlickLogRedirector(log));
-		writeLogHeader();
-		
-		Log.i("=== Starting initialization sequence ===");
-		
-		// pre-init hook
-		Log.f2("Calling pre-init hook...");
-		preInit();
-		
-		/*
-		 * Event bus
-		 */
-		Log.f2("Starting Event Bus...");
-		eventBus = new EventBus();
-		eventBus.subscribe(this);
-		eventBus.detailedLogging = opt.busLogging;
-		
-		/*
-		 * Ionizables
-		 */
-		Log.f3("Initializing ION save system...");
-		registerIonizables();
-		
 		/*
 		 * Display
 		 */
@@ -208,126 +153,6 @@ public abstract class BaseApp extends App implements AppAccess, UncaughtExceptio
 		 */
 		Log.f2("Registering screens...");
 		initScreens(screenRegistry);
-		
-		postInit();
-		Log.i("=== Initialization sequence completed ===");
-	}
-	
-	
-	protected void writeLogHeader()
-	{
-		logSystemInfo();
-	}
-	
-	
-	protected void logSystemInfo()
-	{
-		String txt = "";
-		
-		txt += "\n### SYSTEM INFO ###\n\n";
-		txt += " Platform ...... " + System.getProperty("os.name") + "\n";
-		txt += " Runtime ....... " + System.getProperty("java.runtime.name") + "\n";
-		txt += " Java .......... " + System.getProperty("java.version") + "\n";
-		txt += " Launch path ... " + System.getProperty("user.dir") + "\n";
-		
-		try {
-			txt += " Workdir ....... " + WorkDir.getWorkDir().getCanonicalPath() + "\n";
-		} catch (final IOException e) {
-			Log.e(e);
-		}
-		
-		Log.i(txt);
-	}
-	
-	
-	protected void registerIonizables()
-	{
-		Ion.registerIndirect(255, new IonizerBinary<Coord>() {
-			
-			@Override
-			public void save(Coord object, IonOutput out) throws IOException
-			{
-				out.writeInt(object.x);
-				out.writeInt(object.y);
-			}
-			
-			
-			@Override
-			public Coord load(IonInput in) throws IOException
-			{
-				final int x = in.readInt();
-				final int y = in.readInt();
-				return new Coord(x, y);
-			}
-			
-		});
-		
-		Ion.registerIndirect(254, new IonizerBinary<Move>() {
-			
-			@Override
-			public void save(Move object, IonOutput out) throws IOException
-			{
-				out.writeInt(object.x());
-				out.writeInt(object.y());
-			}
-			
-			
-			@Override
-			public Move load(IonInput in) throws IOException
-			{
-				final int x = in.readInt();
-				final int y = in.readInt();
-				return new Move(x, y);
-			}
-			
-		});
-	}
-	
-	
-	/**
-	 * Called at the beginning of the initialization sequence, right after lock
-	 * was obtained.
-	 */
-	@Stub
-	protected void preInit()
-	{
-	}
-	
-	
-	/**
-	 * Called at the end of init sequence, before main loop starts.
-	 */
-	@Stub
-	protected void postInit()
-	{
-	}
-	
-	
-	/**
-	 * Create window and configure rendering system
-	 * 
-	 * @param gfx Graphics module
-	 */
-	@Stub
-	protected void initDisplay(RenderModule gfx)
-	{
-		gfx.setSize(800, 600);
-		gfx.setResizable(true);
-		gfx.setTitle("New Game");
-		gfx.setTargetFps(60);
-		
-		gfx.createDisplay();
-	}
-	
-	
-	/**
-	 * Configure sound system (ie. adjust volume)
-	 * 
-	 * @param audio
-	 */
-	@Stub
-	protected void initSoundSystem(SoundSystem audio)
-	{
 	}
 	
 	
@@ -353,104 +178,9 @@ public abstract class BaseApp extends App implements AppAccess, UncaughtExceptio
 	}
 	
 	
-	/*
-	 * Try to obtain lock.
-	 */
-	private void initLock()
-	{
-		final File lock = WorkDir.getFile(opt.lockFile);
-		if (!InstanceLock.onFile(lock)) {
-			onLockError();
-			return;
-		}
-	}
-	
-	
-	@Stub
-	protected void initInputSystem(InputSystem input)
-	{
-	}
-	
-	
-	/**
-	 * Triggered when lock cannot be obtained.<br>
-	 * App should terminate gracefully.
-	 */
-	protected void onLockError()
-	{
-		Log.e("Could not obtain lock file.\nOnly one instance can run at a time.");
-		
-		//@formatter:off
-		JOptionPane.showMessageDialog(
-				null,
-				"Another instance is already running.\n(Delete the "+opt.lockFile +" file in the working directory to override)",
-				"Lock Error",
-				JOptionPane.ERROR_MESSAGE
-		);
-		//@formatter:on
-		
-		shutdown();
-	}
-	
-	
-	@Override
-	public final SoundSystem getSoundSystem()
-	{
-		return soundSystem;
-	}
-	
-	
-	@Override
-	public final InputSystem getInput()
-	{
-		return inputSystem;
-	}
-	
-	
-	@Override
-	public final EventBus getEventBus()
-	{
-		return eventBus;
-	}
-	
-	
 	protected void beforeShutdown()
 	{
+		// ???
 		if (lockObtained) Config.save();
 	}
-	
-	
-	@Override
-	public final void uncaughtException(Thread t, Throwable e)
-	{
-		onCrash(e);
-	}
-	
-	
-	protected void onCrash(Throwable e)
-	{
-		Log.e("The game has crashed.", e);
-		shutdown();
-	}
-	
-	
-	@Override
-	public final void shutdown()
-	{
-		beforeShutdown();
-		
-		Log.i("Shutting down subsystems...");
-		
-		try {
-			if (getEventBus() != null) {
-				getEventBus().send(new DestroyEvent());
-				getEventBus().destroy();
-			}
-		} catch (final Throwable e) {
-			Log.e(e);
-		}
-		
-		Log.i("Terminating...");
-		System.exit(0);
-	}
 }

src/mightypork/gamecore/core/modules/MainLoop.java

@@ -5,12 +5,14 @@ import java.util.Deque;
 import java.util.concurrent.ConcurrentLinkedDeque;
 
 import mightypork.gamecore.gui.screens.ScreenRegistry;
+import mightypork.gamecore.plugins.screenshot.TaskTakeScreenshot;
 import mightypork.gamecore.render.Renderable;
-import mightypork.gamecore.render.TaskTakeScreenshot;
 import mightypork.gamecore.render.events.ScreenshotRequestListener;
 import mightypork.utils.Support;
 import mightypork.utils.annotations.Stub;
+import mightypork.utils.eventbus.clients.BusNode;
 import mightypork.utils.eventbus.events.UpdateEvent;
+import mightypork.utils.interfaces.Destroyable;
 import mightypork.utils.logging.Log;
 import mightypork.utils.math.timing.Profiler;
 import mightypork.utils.math.timing.TimerDelta;
@@ -21,7 +23,7 @@ import mightypork.utils.math.timing.TimerDelta;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public class MainLoop extends AppModule implements ScreenshotRequestListener {
+public class MainLoop extends BusNode implements Destroyable {
 	
 	private static final double MAX_TIME_TASKS = 1 / 30D; // (avoid queue from hogging timing)
 	private static final double MAX_DELTA = 1 / 20D; // (skip huge gaps caused by loading resources etc)
@@ -29,16 +31,7 @@ public class MainLoop extends AppModule implements ScreenshotRequestListener {
 	private final Deque<Runnable> tasks = new ConcurrentLinkedDeque<>();
 	private TimerDelta timer;
 	private Renderable rootRenderable;
-	private volatile boolean running = true;
-	
-	
-	/**
-	 * @param app {@link AppAccess} instance
-	 */
-	public MainLoop(AppAccess app) {
-		super(app);
-	}
-	
+	private volatile boolean running = true;	
 	
 	/**
 	 * Set primary renderable
@@ -68,7 +61,7 @@ public class MainLoop extends AppModule implements ScreenshotRequestListener {
 				delta = MAX_DELTA;
 			}
 			
-			getEventBus().sendDirect(new UpdateEvent(delta));
+			App.bus().sendDirect(new UpdateEvent(delta));
 			
 			Runnable r;
 			final long t = Profiler.begin();
@@ -115,7 +108,7 @@ public class MainLoop extends AppModule implements ScreenshotRequestListener {
 	
 	
 	@Override
-	protected void deinit()
+	public void destroy()
 	{
 		running = false;
 	}
@@ -136,19 +129,4 @@ public class MainLoop extends AppModule implements ScreenshotRequestListener {
 		}
 	}
 	
-	
-	@Override
-	public void onScreenshotRequest()
-	{
-		// ensure it's started in main thread
-		queueTask(new Runnable() {
-			
-			@Override
-			public void run()
-			{
-				Support.runAsThread(new TaskTakeScreenshot());
-			}
-		}, false);
-	}
-	
 }

src/mightypork/gamecore/gui/components/LayoutComponent.java

@@ -4,8 +4,6 @@ package mightypork.gamecore.gui.components;
 import java.util.Collection;
 import java.util.LinkedList;
 
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.core.modules.AppSubModule;
 import mightypork.gamecore.input.InputSystem;
 import mightypork.gamecore.resources.audio.SoundSystem;
 import mightypork.utils.eventbus.EventBus;

src/mightypork/gamecore/gui/components/input/TextButton.java

@@ -5,7 +5,7 @@ import mightypork.gamecore.gui.AlignX;
 import mightypork.gamecore.gui.components.DynamicWidthComponent;
 import mightypork.gamecore.gui.components.painters.TextPainter;
 import mightypork.gamecore.input.InputSystem;
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.utils.math.color.Color;
 import mightypork.utils.math.color.pal.RGB;
 import mightypork.utils.math.constraints.vect.Vect;
@@ -32,7 +32,7 @@ public class TextButton extends ClickableComponent implements DynamicWidthCompon
 	private boolean hoverMove = true;
 	
 	
-	public TextButton(GLFont font, String text, Color color) {
+	public TextButton(IFont font, String text, Color color) {
 		this.color = color;
 		
 		this.textPainter = new TextPainter(font, AlignX.CENTER, this.color, text);

src/mightypork/gamecore/gui/components/layout/ColumnLayout.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.gui.components.layout;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.components.Component;
 import mightypork.utils.math.constraints.rect.RectBound;
 

src/mightypork/gamecore/gui/components/layout/ConstraintLayout.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.gui.components.layout;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.components.Component;
 import mightypork.gamecore.gui.components.LayoutComponent;
 import mightypork.utils.math.constraints.rect.RectBound;
@@ -14,12 +13,11 @@ import mightypork.utils.math.constraints.rect.RectBound;
  */
 public class ConstraintLayout extends LayoutComponent {
 	
-	public ConstraintLayout(AppAccess app) {
-		super(app);
+	public ConstraintLayout() {
 	}
 	
 	
-	public ConstraintLayout(AppAccess app, RectBound context) {
+	public ConstraintLayout(RectBound context) {
 		super(app, context);
 	}
 	

src/mightypork/gamecore/gui/components/layout/FlowColumnLayout.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.gui.components.layout;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.AlignX;
 import mightypork.gamecore.gui.components.Component;
 import mightypork.gamecore.gui.components.LayoutComponent;

src/mightypork/gamecore/gui/components/layout/FlowRowLayout.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.gui.components.layout;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.AlignY;
 import mightypork.gamecore.gui.components.Component;
 import mightypork.gamecore.gui.components.LayoutComponent;

src/mightypork/gamecore/gui/components/layout/GridLayout.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.gui.components.layout;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.components.Component;
 import mightypork.gamecore.gui.components.LayoutComponent;
 import mightypork.utils.math.constraints.rect.RectBound;

src/mightypork/gamecore/gui/components/layout/RowLayout.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.gui.components.layout;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.components.Component;
 import mightypork.utils.math.constraints.rect.RectBound;
 

src/mightypork/gamecore/gui/components/layout/linear/LinearLayout.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.gui.components.layout.linear;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.AlignX;
 import mightypork.gamecore.gui.components.DynamicWidthComponent;
 import mightypork.gamecore.gui.components.LayoutComponent;

src/mightypork/gamecore/gui/components/painters/TextPainter.java

@@ -6,7 +6,7 @@ import mightypork.gamecore.gui.AlignX;
 import mightypork.gamecore.gui.components.BaseComponent;
 import mightypork.gamecore.gui.components.DynamicWidthComponent;
 import mightypork.gamecore.resources.fonts.FontRenderer;
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.utils.math.color.Color;
 import mightypork.utils.math.color.pal.RGB;
 import mightypork.utils.math.constraints.num.Num;
@@ -39,32 +39,32 @@ public class TextPainter extends BaseComponent implements DynamicWidthComponent
 	/**
 	 * @param font font to use
 	 */
-	public TextPainter(GLFont font) {
+	public TextPainter(IFont font) {
 		this(font, AlignX.LEFT, RGB.WHITE);
 	}
 	
 	
-	public TextPainter(GLFont font, Color color, String text) {
+	public TextPainter(IFont font, Color color, String text) {
 		this(font, AlignX.LEFT, color, new StringWrapper(text));
 	}
 	
 	
-	public TextPainter(GLFont font, Color color, StringProvider text) {
+	public TextPainter(IFont font, Color color, StringProvider text) {
 		this(font, AlignX.LEFT, color, text);
 	}
 	
 	
-	public TextPainter(GLFont font, Color color) {
+	public TextPainter(IFont font, Color color) {
 		this(font, AlignX.LEFT, color, (StringProvider) null);
 	}
 	
 	
-	public TextPainter(GLFont font, AlignX align, Color color, String text) {
+	public TextPainter(IFont font, AlignX align, Color color, String text) {
 		this(font, align, color, new StringWrapper(text));
 	}
 	
 	
-	public TextPainter(GLFont font, AlignX align, Color color, StringProvider text) {
+	public TextPainter(IFont font, AlignX align, Color color, StringProvider text) {
 		this.font = new FontRenderer(font);
 		this.color = color;
 		this.align = align;
@@ -72,7 +72,7 @@ public class TextPainter extends BaseComponent implements DynamicWidthComponent
 	}
 	
 	
-	public TextPainter(GLFont font, AlignX align, Color color) {
+	public TextPainter(IFont font, AlignX align, Color color) {
 		this(font, align, color, (StringProvider) null);
 	}
 	

src/mightypork/gamecore/gui/screens/LayeredScreen.java

@@ -7,7 +7,6 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.utils.eventbus.clients.DelegatingClient;
 
 
@@ -47,11 +46,7 @@ public abstract class LayeredScreen extends Screen {
 	private final LayersClient layersClient = new LayersClient();
 	
 	
-	/**
-	 * @param app app access
-	 */
-	public LayeredScreen(AppAccess app) {
-		super(app);
+	public LayeredScreen() {
 		addChildClient(layersClient);
 	}
 	

src/mightypork/gamecore/gui/screens/Overlay.java

@@ -5,18 +5,17 @@ import java.util.ArrayList;
 import java.util.Collection;
 
 import mightypork.gamecore.core.modules.App;
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.core.modules.AppSubModule;
 import mightypork.gamecore.gui.Hideable;
 import mightypork.gamecore.gui.components.layout.ConstraintLayout;
 import mightypork.gamecore.gui.events.LayoutChangeListener;
+import mightypork.gamecore.input.Edge;
 import mightypork.gamecore.input.InputSystem;
 import mightypork.gamecore.input.KeyBinder;
 import mightypork.gamecore.input.KeyBindingPool;
 import mightypork.gamecore.input.KeyStroke;
-import mightypork.gamecore.input.KeyStroke.Edge;
 import mightypork.gamecore.render.Renderable;
 import mightypork.utils.annotations.Stub;
+import mightypork.utils.eventbus.clients.BusNode;
 import mightypork.utils.interfaces.Enableable;
 import mightypork.utils.interfaces.Updateable;
 import mightypork.utils.math.color.Color;
@@ -30,7 +29,7 @@ import mightypork.utils.math.constraints.vect.Vect;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public abstract class Overlay extends AppSubModule implements Comparable<Overlay>, Updateable, Renderable, KeyBinder, Hideable, Enableable, LayoutChangeListener {
+public abstract class Overlay extends BusNode implements Comparable<Overlay>, Updateable, Renderable, KeyBinder, Hideable, Enableable, LayoutChangeListener {
 	
 	private boolean visible = true;
 	private boolean enabled = true;
@@ -51,13 +50,11 @@ public abstract class Overlay extends AppSubModule implements Comparable<Overlay
 	private Num alphaMul = Num.ONE;
 	
 	
-	public Overlay(AppAccess app) {
-		super(app);
+	public Overlay() {
 		
-		getInput();
 		this.mouse = InputSystem.getMousePos();
 		
-		this.root = new ConstraintLayout(app, App.gfx().getRect());
+		this.root = new ConstraintLayout(App.gfx().getRect());
 		addChildClient(root);
 		addChildClient(keybindings);
 		

src/mightypork/gamecore/gui/screens/Screen.java

@@ -2,16 +2,15 @@ package mightypork.gamecore.gui.screens;
 
 
 import mightypork.gamecore.core.modules.App;
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.core.modules.AppSubModule;
 import mightypork.gamecore.gui.events.LayoutChangeEvent;
 import mightypork.gamecore.gui.events.LayoutChangeListener;
+import mightypork.gamecore.input.Edge;
 import mightypork.gamecore.input.KeyBinder;
 import mightypork.gamecore.input.KeyBindingPool;
 import mightypork.gamecore.input.KeyStroke;
-import mightypork.gamecore.input.KeyStroke.Edge;
 import mightypork.gamecore.render.Renderable;
 import mightypork.utils.annotations.Stub;
+import mightypork.utils.eventbus.clients.BusNode;
 import mightypork.utils.math.constraints.rect.Rect;
 import mightypork.utils.math.constraints.rect.RectBound;
 
@@ -21,7 +20,7 @@ import mightypork.utils.math.constraints.rect.RectBound;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public abstract class Screen extends AppSubModule implements Renderable, RectBound, KeyBinder, LayoutChangeListener {
+public abstract class Screen extends BusNode implements Renderable, RectBound, KeyBinder, LayoutChangeListener {
 	
 	private final KeyBindingPool keybindings = new KeyBindingPool();
 	
@@ -32,8 +31,7 @@ public abstract class Screen extends AppSubModule implements Renderable, RectBou
 	/**
 	 * @param app app access
 	 */
-	public Screen(AppAccess app) {
-		super(app);
+	public Screen() {
 		
 		// disable events initially
 		setListening(false);
@@ -44,7 +42,7 @@ public abstract class Screen extends AppSubModule implements Renderable, RectBou
 	
 	private void fireLayoutChangeEvent()
 	{
-		getEventBus().sendDirectToChildren(this, new LayoutChangeEvent());
+		App.bus().sendDirectToChildren(this, new LayoutChangeEvent());
 	}
 	
 	

src/mightypork/gamecore/gui/screens/ScreenLayer.java

@@ -18,8 +18,6 @@ public abstract class ScreenLayer extends Overlay {
 	 * @param screen parent screen
 	 */
 	public ScreenLayer(Screen screen) {
-		super(screen); // screen as AppAccess
-		
 		this.screen = screen;
 	}
 	

src/mightypork/gamecore/gui/screens/ScreenRegistry.java

@@ -6,14 +6,13 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.TreeSet;
 
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.core.modules.AppModule;
+import mightypork.gamecore.core.modules.App;
 import mightypork.gamecore.gui.events.LayoutChangeEvent;
 import mightypork.gamecore.gui.events.ScreenRequestListener;
 import mightypork.gamecore.render.Renderable;
 import mightypork.gamecore.render.events.ViewportChangeEvent;
 import mightypork.gamecore.render.events.ViewportChangeListener;
-import mightypork.utils.annotations.Stub;
+import mightypork.utils.eventbus.clients.BusNode;
 import mightypork.utils.logging.Log;
 
 
@@ -22,21 +21,13 @@ import mightypork.utils.logging.Log;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public class ScreenRegistry extends AppModule implements ScreenRequestListener, ViewportChangeListener, Renderable {
+public class ScreenRegistry extends BusNode implements ScreenRequestListener, ViewportChangeListener, Renderable {
 	
 	private final Map<String, Screen> screens = new HashMap<>();
 	private final Collection<Overlay> overlays = new TreeSet<>();
 	private volatile Screen active = null;
 	
 	
-	/**
-	 * @param app app access
-	 */
-	public ScreenRegistry(AppAccess app) {
-		super(app);
-	}
-	
-	
 	/**
 	 * Add a screen
 	 * 
@@ -100,14 +91,6 @@ public class ScreenRegistry extends AppModule implements ScreenRequestListener,
 	}
 	
 	
-	@Override
-	@Stub
-	protected void deinit()
-	{
-		//
-	}
-	
-	
 	@Override
 	public void onViewportChanged(ViewportChangeEvent event)
 	{
@@ -117,7 +100,7 @@ public class ScreenRegistry extends AppModule implements ScreenRequestListener,
 	
 	private void fireLayoutUpdateEvent()
 	{
-		getEventBus().sendDirectToChildren(this, new LayoutChangeEvent());
+		App.bus().sendDirectToChildren(this, new LayoutChangeEvent());
 	}
 	
 }

src/mightypork/gamecore/gui/screens/impl/CrossfadeOverlay.java

@@ -2,7 +2,7 @@ package mightypork.gamecore.gui.screens.impl;
 
 
 import mightypork.gamecore.core.events.ShudownRequest;
-import mightypork.gamecore.core.modules.AppAccess;
+import mightypork.gamecore.core.modules.App;
 import mightypork.gamecore.gui.components.painters.QuadPainter;
 import mightypork.gamecore.gui.events.ScreenRequest;
 import mightypork.gamecore.gui.screens.Overlay;
@@ -31,9 +31,9 @@ public class CrossfadeOverlay extends Overlay {
 		public void run()
 		{
 			if (requestedScreenName == null) {
-				getEventBus().send(new ShudownRequest());
+				App.bus().send(new ShudownRequest());
 			} else {
-				getEventBus().send(new ScreenRequest(requestedScreenName));
+				App.bus().send(new ScreenRequest(requestedScreenName));
 			}
 			alpha.setEasing(Easing.SINE_OUT);
 			alpha.fadeOut(T_OUT);
@@ -41,9 +41,7 @@ public class CrossfadeOverlay extends Overlay {
 	};
 	
 	
-	public CrossfadeOverlay(AppAccess app) {
-		super(app);
-		
+	public CrossfadeOverlay() {
 		final QuadPainter qp = new QuadPainter(RGB.BLACK); // TODO allow custom colors
 		qp.setRect(root);
 		root.add(qp);

src/mightypork/gamecore/initializers/InitTask.java

@@ -0,0 +1,47 @@
+package mightypork.gamecore.initializers;
+
+
+import mightypork.gamecore.core.modules.App;
+import mightypork.utils.annotations.Stub;
+
+
+/**
+ * App initializer. A sequence of initializers is executed once the start()
+ * method on App is called. Adding initializers is one way to customize the App
+ * behavior and features.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public abstract class InitTask {
+	
+	/**
+	 * Run the initalizer on app.
+	 * 
+	 * @param app the app instance.
+	 */
+	public abstract void run(App app);
+	
+	
+	/**
+	 * Get name of this initializer (for dependency resolver).<br>
+	 * The name should be short, snake_case and precise.
+	 * 
+	 * @return name
+	 */
+	public abstract String getName();
+	
+	
+	/**
+	 * Get what other initializers must be already loaded before this can load.<br>
+	 * Depending on itself or creating a circular dependency will cause error.<br>
+	 * If the dependencies cannot be satisfied, the initialization sequence will
+	 * be aborted.
+	 * 
+	 * @return array of names of required initializers.
+	 */
+	@Stub
+	public String[] getDependencies()
+	{
+		return new String[] {};
+	}
+}

src/mightypork/gamecore/initializers/InitTaskResolver.java

@@ -0,0 +1,79 @@
+package mightypork.gamecore.initializers;
+
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import mightypork.utils.logging.Log;
+
+
+public class InitTaskResolver {
+	
+	/**
+	 * Order init tasks so that all dependencies are loaded before thye are
+	 * needed by the tasks.
+	 * 
+	 * @param tasks task list
+	 * @return task list ordered
+	 */
+	public static List<InitTask> order(List<InitTask> tasks)
+	{
+		List<InitTask> remaining = new ArrayList<>(tasks);
+		
+		List<InitTask> ordered = new ArrayList<>();
+		Set<String> loaded = new HashSet<>();
+		
+		// resolve task order
+		int addedThisIteration = 0;
+		do {
+			for (Iterator<InitTask> i = remaining.iterator(); i.hasNext();) {
+				InitTask task = i.next();
+				
+				String[] deps = task.getDependencies();
+				if (deps == null) deps = new String[] {};
+				
+				int unmetDepsCount = deps.length;
+				
+				for (String d : deps) {
+					if (loaded.contains(d)) unmetDepsCount--;
+				}
+				
+				if (unmetDepsCount == 0) {
+					ordered.add(task);
+					loaded.add(task.getName());
+					i.remove();
+					addedThisIteration++;
+				}
+			}
+		} while (addedThisIteration > 0);
+		
+		// check if any tasks are left out
+		if (remaining.size() > 0) {
+			
+			// build error message for each bad task
+			for (InitTask task : remaining) {
+				String notSatisfied = "";
+				
+				for (String d : task.getDependencies()) {
+					if (!loaded.contains(d)) {
+						
+						if (!notSatisfied.isEmpty()) {
+							notSatisfied += ", ";
+						}
+						
+						notSatisfied += d;
+					}
+				}
+				
+				Log.w("InitTask \"" + task.getName() + "\" - missing dependencies: " + notSatisfied);
+			}
+			
+			throw new RuntimeException("Some InitTask dependencies could not be satisfied.");
+		}
+		
+		return ordered;
+	}
+}

src/mightypork/gamecore/initializers/tasks/InitTaskRegisterIonizables.java

@@ -0,0 +1,74 @@
+package mightypork.gamecore.initializers.tasks;
+
+
+import java.io.IOException;
+
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.initializers.InitTask;
+import mightypork.utils.ion.Ion;
+import mightypork.utils.ion.IonInput;
+import mightypork.utils.ion.IonOutput;
+import mightypork.utils.ion.IonizerBinary;
+import mightypork.utils.math.algo.Coord;
+import mightypork.utils.math.algo.Move;
+
+
+/**
+ * Register extra ionizables added by the game library (non-native ION types).<br>
+ * This initializer can be called anywhere in the initialization sequence.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class InitTaskRegisterIonizables extends InitTask {
+	
+	@Override
+	public void run(App app)
+	{
+		Ion.registerIndirect(255, new IonizerBinary<Coord>() {
+			
+			@Override
+			public void save(Coord object, IonOutput out) throws IOException
+			{
+				out.writeInt(object.x);
+				out.writeInt(object.y);
+			}
+			
+			
+			@Override
+			public Coord load(IonInput in) throws IOException
+			{
+				final int x = in.readInt();
+				final int y = in.readInt();
+				return new Coord(x, y);
+			}
+			
+		});
+		
+		Ion.registerIndirect(254, new IonizerBinary<Move>() {
+			
+			@Override
+			public void save(Move object, IonOutput out) throws IOException
+			{
+				out.writeInt(object.x());
+				out.writeInt(object.y());
+			}
+			
+			
+			@Override
+			public Move load(IonInput in) throws IOException
+			{
+				final int x = in.readInt();
+				final int y = in.readInt();
+				return new Move(x, y);
+			}
+			
+		});
+	}
+
+	@Override
+	public String getName()
+	{
+		return "ion";
+	}
+	
+}

src/mightypork/gamecore/initializers/tasks/InitTaskSetupCrashHandler.java

@@ -0,0 +1,42 @@
+package mightypork.gamecore.initializers.tasks;
+
+
+import java.lang.Thread.UncaughtExceptionHandler;
+
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.initializers.InitTask;
+import mightypork.utils.annotations.Stub;
+import mightypork.utils.logging.Log;
+
+
+/**
+ * Add a crash handler to the app.<br>
+ * For customized crash message / crash dialog etc, override the
+ * uncaughtException() method.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class InitTaskSetupCrashHandler extends InitTask implements UncaughtExceptionHandler {
+	
+	@Override
+	public void run(App app)
+	{
+		Thread.setDefaultUncaughtExceptionHandler(this);
+	}
+	
+	
+	@Override
+	@Stub
+	public void uncaughtException(Thread thread, Throwable throwable)
+	{
+		Log.e("The game has crashed.", throwable);
+		App.shutdown();
+	}
+	
+	
+	@Override
+	public String getName()
+	{
+		return "crash_handler";
+	}
+}

src/mightypork/gamecore/initializers/tasks/InitTaskSetupDisplay.java

@@ -0,0 +1,100 @@
+package mightypork.gamecore.initializers.tasks;
+
+
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.initializers.InitTask;
+import mightypork.gamecore.render.GraphicsModule;
+
+
+/**
+ * Setup main window.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class InitTaskSetupDisplay extends InitTask {
+	
+	private int width = 800, height = 600, fps = 60;
+	private boolean resizable, fullscreen;
+	private String title = "Game";
+	
+	
+	/**
+	 * Set initial window size
+	 * 
+	 * @param width width (px)
+	 * @param height height (px)
+	 */
+	public void setSize(int width, int height)
+	{
+		this.width = width;
+		this.height = height;
+	}
+	
+	
+	/**
+	 * Set whether the window should be resizable
+	 * 
+	 * @param resizable true for resizable
+	 */
+	public void setResizable(boolean resizable)
+	{
+		this.resizable = resizable;
+	}
+	
+	
+	/**
+	 * Set window title
+	 * 
+	 * @param title title text
+	 */
+	public void setTitle(String title)
+	{
+		this.title = title;
+	}
+	
+	
+	/**
+	 * Set desired framerate.
+	 * 
+	 * @param fps FPS
+	 */
+	public void setTargetFps(int fps)
+	{
+		this.fps = fps;
+	}
+	
+	
+	/**
+	 * Set whether the window should start in fullscreen
+	 * 
+	 * @param fullscreen true for fullscreen
+	 */
+	public void setFullscreen(boolean fullscreen)
+	{
+		this.fullscreen = fullscreen;
+	}
+	
+	
+	@Override
+	public void run(App app)
+	{
+		GraphicsModule gfx = app.getBackend().getGraphics();
+		
+		gfx.setSize(width, height);
+		gfx.setResizable(resizable);
+		gfx.setTitle(title);
+		gfx.setTargetFps(fps);
+		
+		if (fullscreen) gfx.setFullscreen(true);
+		
+		gfx.createDisplay();
+	}
+
+
+	@Override
+	public String getName()
+	{
+		return "display";
+	}
+	
+}

src/mightypork/gamecore/initializers/tasks/InitTaskSetupLog.java

@@ -0,0 +1,105 @@
+package mightypork.gamecore.initializers.tasks;
+
+
+import java.io.File;
+import java.util.logging.Level;
+
+import mightypork.gamecore.core.WorkDir;
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.initializers.InitTask;
+import mightypork.utils.logging.Log;
+import mightypork.utils.logging.writers.LogWriter;
+
+
+/**
+ * Init main logger and console log printing.<br>
+ * Must be called after workdir is initialized.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class InitTaskSetupLog extends InitTask {
+	
+	private String logDir = "log";
+	private String logName = "runtime";
+	private int archiveCount = 5;
+	
+	private Level levelWrite = Level.ALL;
+	private Level levelPrint = Level.ALL;
+	
+	
+	/**
+	 * Set log directory (relative to workdir).<br>
+	 * Defaults to "log".
+	 * 
+	 * @param logDir log directory.
+	 */
+	public void setLogDir(String logDir)
+	{
+		this.logDir = logDir;
+	}
+	
+	
+	/**
+	 * Set log name. This name is used as a prefix for archived log files.<br>
+	 * Should contain only valid filename characters.<br>
+	 * Defaults to "runtime".
+	 * 
+	 * @param logName log name
+	 */
+	public void setLogName(String logName)
+	{
+		// TODO validate characters
+		this.logName = logName;
+	}
+	
+	
+	/**
+	 * Set number of logs to keep in the logs directory.<br>
+	 * Set to 0 to keep just the last log, -1 to keep unlimited number of logs.<br>
+	 * Defaults to 5.
+	 * 
+	 * @param archiveCount logs to keep
+	 */
+	public void setArchiveCount(int archiveCount)
+	{
+		this.archiveCount = archiveCount;
+	}
+	
+	
+	/**
+	 * Set logging levels (minimal level of message to be accepted)<br>
+	 * Defaults to ALL, ALL.
+	 * 
+	 * @param levelWrite level for writing to file
+	 * @param levelPrint level for writing to stdout / stderr
+	 */
+	public void setLevels(Level levelWrite, Level levelPrint)
+	{
+		this.levelWrite = levelWrite;
+		this.levelPrint = levelPrint;
+	}
+	
+	
+	@Override
+	public void run(App app)
+	{
+		final LogWriter log = Log.create(logName, new File(WorkDir.getDir(logDir), logName + ".log"), archiveCount);
+		Log.setMainLogger(log);
+		Log.setLevel(levelWrite);
+		Log.setSysoutLevel(levelPrint);
+	}
+	
+	
+	@Override
+	public String getName()
+	{
+		return "log";
+	}
+	
+	
+	@Override
+	public String[] getDependencies()
+	{
+		return new String[] { "workdir" };
+	}
+}

src/mightypork/gamecore/initializers/tasks/InitTaskSetupWorkdir.java

@@ -0,0 +1,113 @@
+package mightypork.gamecore.initializers.tasks;
+
+
+import java.io.File;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import javax.swing.JOptionPane;
+
+import mightypork.gamecore.core.WorkDir;
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.initializers.InitTask;
+import mightypork.utils.annotations.Stub;
+import mightypork.utils.files.InstanceLock;
+import mightypork.utils.logging.Log;
+
+
+/**
+ * Initializer that takes care of setting up the proper workdir.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class InitTaskSetupWorkdir extends InitTask {
+	
+	private final File workdirPath;
+	private boolean doLock;
+	private String lockFile = ".lock";
+	private Map<String, String> namedPaths = new HashMap<>();
+	
+	
+	/**
+	 * @param workdir path to the working directory
+	 * @param lock whether to lock the directory (single instance mode)
+	 */
+	public InitTaskSetupWorkdir(File workdir, boolean lock) {
+		this.workdirPath = workdir;
+		this.doLock = lock;
+	}
+	
+	
+	/**
+	 * Set name of the lock file.
+	 * 
+	 * @param lockFile
+	 */
+	public void setLockFileName(String lockFile)
+	{
+		this.lockFile = lockFile;
+	}
+	
+	
+	/**
+	 * Add a named path
+	 * 
+	 * @param alias path alias (snake_case)
+	 * @param path path (relative to the workdir)
+	 */
+	public void addPath(String alias, String path)
+	{
+		namedPaths.put(alias, path);
+	}
+	
+	
+	@Override
+	public void run(App app)
+	{
+		WorkDir.init(workdirPath);
+		
+		// lock working directory
+		if (doLock) {
+			final File lock = WorkDir.getFile(lockFile);
+			if (!InstanceLock.onFile(lock)) {
+				onLockError();
+				return;
+			}
+		}
+		
+		for (Entry<String, String> e : namedPaths.entrySet()) {
+			WorkDir.addPath(e.getKey(), e.getValue());
+		}
+	}
+	
+	
+	/**
+	 * Called when the lock file could not be obtained (cannot write or already
+	 * exists).<br>
+	 * Feel free to override this method to define custom behavior.
+	 */
+	@Stub
+	protected void onLockError()
+	{
+		Log.e("Could not obtain lock file.\nOnly one instance can run at a time.");
+		
+		//@formatter:off
+		JOptionPane.showMessageDialog(
+				null,
+				"Another instance is already running.\n(Delete the "+lockFile +" file in the working directory to override)",
+				"Lock Error",
+				JOptionPane.ERROR_MESSAGE
+		);
+		//@formatter:on
+		
+		App.shutdown();
+	}
+	
+	
+	@Override
+	public String getName()
+	{
+		return "workdir";
+	}
+}

src/mightypork/gamecore/initializers/tasks/InitTaskWriteLogHeader.java

@@ -0,0 +1,53 @@
+package mightypork.gamecore.initializers.tasks;
+
+
+import java.io.IOException;
+
+import mightypork.gamecore.core.WorkDir;
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.initializers.InitTask;
+import mightypork.utils.logging.Log;
+
+
+/**
+ * initializer task that writes a system info header to the log file.<br>
+ * Must be called after log is initialized.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class InitTaskWriteLogHeader extends InitTask {
+	
+	@Override
+	public void run(App app)
+	{
+		String txt = "";
+		
+		txt += "\n### SYSTEM INFO ###\n\n";
+		txt += " Platform ...... " + System.getProperty("os.name") + "\n";
+		txt += " Runtime ....... " + System.getProperty("java.runtime.name") + "\n";
+		txt += " Java .......... " + System.getProperty("java.version") + "\n";
+		txt += " Launch path ... " + System.getProperty("user.dir") + "\n";
+		
+		try {
+			txt += " Workdir ....... " + WorkDir.getWorkDir().getCanonicalPath() + "\n";
+		} catch (final IOException e) {
+			Log.e(e);
+		}
+		
+		Log.i(txt);
+	}
+	
+	
+	@Override
+	public String getName()
+	{
+		return "log_header";
+	}
+	
+	
+	@Override
+	public String[] getDependencies()
+	{
+		return new String[] { "log", "workdir" };
+	}
+}

src/mightypork/gamecore/input/Edge.java

@@ -0,0 +1,12 @@
+package mightypork.gamecore.input;
+
+/**
+ * Type of keystroke (falling / rising edge)
+ */
+public enum Edge
+{
+	/** Activated by falling edge (press) */
+	FALLING,
+	/** Activated by rising edge (release) */
+	RISING;
+}

src/mightypork/gamecore/input/InputSystem.java

@@ -2,13 +2,13 @@ package mightypork.gamecore.input;
 
 
 import mightypork.gamecore.core.events.UserQuitRequest;
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.input.KeyStroke.Edge;
+import mightypork.gamecore.core.modules.App;
 import mightypork.gamecore.input.events.InputReadyEvent;
 import mightypork.gamecore.input.events.KeyEvent;
 import mightypork.gamecore.input.events.MouseButtonEvent;
 import mightypork.gamecore.input.events.MouseMotionEvent;
-import mightypork.utils.eventbus.clients.RootBusNode;
+import mightypork.utils.eventbus.clients.BusNode;
+import mightypork.utils.interfaces.Destroyable;
 import mightypork.utils.interfaces.Updateable;
 import mightypork.utils.math.constraints.vect.Vect;
 import mightypork.utils.math.constraints.vect.var.VectVar;
@@ -24,7 +24,7 @@ import org.lwjgl.opengl.Display;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public class InputSystem extends RootBusNode implements Updateable, KeyBinder {
+public class InputSystem extends BusNode implements Updateable, KeyBinder, Destroyable {
 	
 	private static boolean inited = false;
 	
@@ -58,8 +58,7 @@ public class InputSystem extends RootBusNode implements Updateable, KeyBinder {
 	/**
 	 * @param app app access
 	 */
-	public InputSystem(AppAccess app) {
-		super(app);
+	public InputSystem() {
 		
 		initDevices();
 		
@@ -67,12 +66,12 @@ public class InputSystem extends RootBusNode implements Updateable, KeyBinder {
 		keybindings = new KeyBindingPool();
 		addChildClient(keybindings);
 		
-		getEventBus().send(new InputReadyEvent());
+		App.bus().send(new InputReadyEvent());
 	}
 	
 	
 	@Override
-	public final void deinit()
+	public final void destroy()
 	{
 		Mouse.destroy();
 		Keyboard.destroy();
@@ -128,7 +127,7 @@ public class InputSystem extends RootBusNode implements Updateable, KeyBinder {
 		}
 		
 		if (wasMouse && !mouseMove.isZero()) {
-			getEventBus().send(new MouseMotionEvent(mouseLastPos, mouseMove));
+			App.bus().send(new MouseMotionEvent(mouseLastPos, mouseMove));
 		}
 		
 		while (Keyboard.next()) {
@@ -136,7 +135,7 @@ public class InputSystem extends RootBusNode implements Updateable, KeyBinder {
 		}
 		
 		if (Display.isCloseRequested()) {
-			getEventBus().send(new UserQuitRequest());
+			App.bus().send(new UserQuitRequest());
 		}
 	}
 	
@@ -155,7 +154,7 @@ public class InputSystem extends RootBusNode implements Updateable, KeyBinder {
 		pos.setY(Display.getHeight() - pos.y());
 		
 		if (button != -1 || wheeld != 0) {
-			getEventBus().send(new MouseButtonEvent(pos.freeze(), button, down, wheeld));
+			App.bus().send(new MouseButtonEvent(pos.freeze(), button, down, wheeld));
 		}
 		
 		moveSum.setTo(moveSum.add(move));
@@ -169,7 +168,7 @@ public class InputSystem extends RootBusNode implements Updateable, KeyBinder {
 		final boolean down = Keyboard.getEventKeyState();
 		final char c = Keyboard.getEventCharacter();
 		
-		getEventBus().send(new KeyEvent(key, c, down));
+		App.bus().send(new KeyEvent(key, c, down));
 	}
 	
 	

src/mightypork/gamecore/input/KeyBinder.java

@@ -2,7 +2,6 @@ package mightypork.gamecore.input;
 
 
 import mightypork.gamecore.gui.Action;
-import mightypork.gamecore.input.KeyStroke.Edge;
 
 
 /**

src/mightypork/gamecore/input/KeyBinding.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.input;
 
 
-import mightypork.gamecore.input.KeyStroke.Edge;
 import mightypork.gamecore.input.events.InputReadyListener;
 import mightypork.gamecore.input.events.KeyEvent;
 import mightypork.gamecore.input.events.KeyEventHandler;

src/mightypork/gamecore/input/KeyBindingPool.java

@@ -5,7 +5,6 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Set;
 
-import mightypork.gamecore.input.KeyStroke.Edge;
 import mightypork.gamecore.input.events.KeyEvent;
 import mightypork.gamecore.input.events.KeyEventHandler;
 import mightypork.utils.logging.Log;

src/mightypork/gamecore/input/KeyStroke.java

@@ -7,34 +7,43 @@ import org.lwjgl.input.Keyboard;
 
 
 /**
- * Key stroke trigger
+ * Key stroke description
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public class KeyStroke { //implements Pollable
-
-	public static enum Edge
-	{
-		FALLING, RISING;
-	}
+public class KeyStroke {
 	
 	private int mod;
 	private int key;
 	
 	
 	/**
-	 * KeyStroke
+	 * Create a Key Stroke
 	 * 
 	 * @param key key code
-	 * @param mod_mask mods mask
+	 * @param modmask modifiers
 	 */
-	public KeyStroke(int key, int mod_mask) {
-		setTo(key, mod_mask);
+	public KeyStroke(int key, int modmask) {
+		setTo(key, modmask);
+	}
+	
+	
+	// FIXME TODO can probably be immutable!
+	/**
+	 * Change to...
+	 * 
+	 * @param key key code
+	 * @param modmask modifiers
+	 */
+	public void setTo(int key, int modmask)
+	{
+		this.key = key;
+		this.mod = modmask | Keys.keyToMod(key); // for mods alone
 	}
 	
 	
 	/**
-	 * Rising edge keystroke
+	 * Create a new keystroke without modifiers
 	 * 
 	 * @param key key code
 	 */
@@ -55,13 +64,6 @@ public class KeyStroke { //implements Pollable
 	}
 	
 	
-	public void setTo(int key, int mod_mask)
-	{
-		this.key = key;
-		this.mod = mod_mask | Keys.keyToMod(key); // for mods alone
-	}
-	
-	
 	public String toDataString()
 	{
 		String s = "";

src/mightypork/gamecore/plugins/AppPlugin.java

@@ -0,0 +1,28 @@
+package mightypork.gamecore.plugins;
+
+
+import mightypork.gamecore.core.modules.App;
+import mightypork.utils.annotations.Stub;
+import mightypork.utils.eventbus.clients.BusNode;
+
+
+/**
+ * App plugin. Plugins are an easy way to extend app functionality.<br>
+ * Typically, a plugin waits for trigger event(s) and performs some action upon
+ * receiving them.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class AppPlugin extends BusNode {
+	
+	/**
+	 * Initialize the plugin for the given App.<br>
+	 * The plugin is already attached to the event bus.
+	 * 
+	 * @param app
+	 */
+	@Stub
+	public void initialize(App app)
+	{
+	}
+}

src/mightypork/gamecore/plugins/screenshot/ScreenshotPlugin.java

@@ -0,0 +1,34 @@
+package mightypork.gamecore.plugins.screenshot;
+
+
+import mightypork.gamecore.core.events.MainLoopRequest;
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.plugins.AppPlugin;
+import mightypork.utils.Support;
+
+
+/**
+ * This plugin waits for a {@link ScreenshotRequest} event.<br>
+ * Upon receiving it, a screenshot is captured and written to file
+ * asynchronously.
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public class ScreenshotPlugin extends AppPlugin {
+	
+	/**
+	 * Take screenshot. Called by the trigger event.
+	 */
+	void takeScreenshot()
+	{
+		App.bus().send(new MainLoopRequest(new Runnable() {
+			
+			@Override
+			public void run()
+			{
+				Runnable tts = new TaskTakeScreenshot();
+				Support.runAsThread(tts);
+			}
+		}));
+	}
+}

src/mightypork/gamecore/plugins/screenshot/ScreenshotRequest.java

@@ -0,0 +1,22 @@
+package mightypork.gamecore.plugins.screenshot;
+
+
+import mightypork.utils.eventbus.BusEvent;
+import mightypork.utils.eventbus.events.flags.SingleReceiverEvent;
+
+
+/**
+ * Event used to request screenshot capture.
+ * 
+ * @author MightyPork
+ */
+@SingleReceiverEvent
+public class ScreenshotRequest extends BusEvent<ScreenshotPlugin> {
+	
+	@Override
+	protected void handleBy(ScreenshotPlugin handler)
+	{
+		handler.takeScreenshot();
+	}
+	
+}

src/mightypork/gamecore/plugins/screenshot/TaskTakeScreenshot.java

@@ -0,0 +1,100 @@
+package mightypork.gamecore.plugins.screenshot;
+
+
+import java.io.File;
+import java.io.IOException;
+
+import mightypork.gamecore.core.WorkDir;
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.render.Screenshot;
+import mightypork.utils.Support;
+import mightypork.utils.logging.Log;
+
+
+/**
+ * Task that takes screenshot and asynchronously saves it to a file.<br>
+ * Can be run in a separate thread, but must be instantiated in the render
+ * thread.
+ * 
+ * @author MightyPork
+ */
+public class TaskTakeScreenshot implements Runnable {
+	
+	private final Screenshot scr;
+	
+	
+	/**
+	 * Take screenshot. Must be called in render thread.
+	 */
+	public TaskTakeScreenshot() {
+		scr = App.gfx().takeScreenshot();
+	}
+	
+	
+	@Override
+	public void run()
+	{
+		// generate unique filename
+		final File file = getScreenshotFile();
+		
+		Log.f3("Saving screenshot to file: " + file);
+		
+		// save to disk
+		try {
+			scr.save(file);
+		} catch (final IOException e) {
+			Log.e("Failed to save screenshot.", e);
+		}
+	}
+	
+	
+	/**
+	 * @return File to save the screenshot to.
+	 */
+	protected File getScreenshotFile()
+	{
+		final String fname = getBaseFilename();
+		return findFreeFile(fname);
+	}
+	
+	
+	/**
+	 * @return directory for screenshots
+	 */
+	protected File getScreenshotDirectory()
+	{
+		return WorkDir.getDir("_screenshot_dir");
+	}
+	
+	
+	/**
+	 * Get base filename for the screenshot, without extension.
+	 * 
+	 * @return filename
+	 */
+	protected String getBaseFilename()
+	{
+		return Support.getTime("yyyy-MM-dd_HH-mm-ss");
+	}
+	
+	
+	/**
+	 * Find first free filename for the screenshot, by adding -NUMBER after the
+	 * base filename and before extension.
+	 * 
+	 * @param base_name base filename
+	 * @return full path to screenshot file
+	 */
+	protected File findFreeFile(String base_name)
+	{
+		File file;
+		int index = 0;
+		while (true) {
+			file = new File(getScreenshotDirectory(), base_name + (index > 0 ? "-" + index : "") + ".png");
+			if (!file.exists()) break;
+			index++;
+		}
+		return file;
+	}
+	
+}

src/mightypork/gamecore/render/GraphicsModule.java

@@ -2,9 +2,8 @@ package mightypork.gamecore.render;
 
 
 import mightypork.gamecore.backend.BackendModule;
-import mightypork.gamecore.resources.textures.LazyTexture;
+import mightypork.gamecore.resources.textures.DeferredTexture;
 import mightypork.gamecore.resources.textures.TxQuad;
-import mightypork.utils.eventbus.BusAccess;
 import mightypork.utils.math.color.Color;
 import mightypork.utils.math.constraints.rect.Rect;
 import mightypork.utils.math.constraints.vect.Vect;
@@ -19,11 +18,7 @@ import mightypork.utils.math.timing.FpsMeter;
  * 
  * @author MightyPork
  */
-public abstract class RenderModule extends BackendModule {
-	
-	public RenderModule(BusAccess busAccess) {
-		super(busAccess);
-	}
+public abstract class GraphicsModule extends BackendModule {
 	
 	protected static final VectConst AXIS_X = Vect.make(1, 0, 0);
 	protected static final VectConst AXIS_Y = Vect.make(0, 1, 0);
@@ -271,7 +266,7 @@ public abstract class RenderModule extends BackendModule {
 	 * @param path path to texture
 	 * @return the lazy texture
 	 */
-	public abstract LazyTexture getLazyTexture(String path);
+	public abstract DeferredTexture getLazyTexture(String path);
 	
 	
 	/**

src/mightypork/gamecore/render/TaskTakeScreenshot.java

@@ -1,57 +0,0 @@
-package mightypork.gamecore.render;
-
-
-import java.io.File;
-import java.io.IOException;
-
-import mightypork.gamecore.core.WorkDir;
-import mightypork.gamecore.core.modules.App;
-import mightypork.utils.Support;
-import mightypork.utils.logging.Log;
-
-import org.newdawn.slick.opengl.GLUtils;
-
-
-/**
- * Task that takes screenshot and asynchronously saves it to a file.<br>
- * Can be run in a separate thread, but must be instantiated in the render
- * thread.
- * 
- * @author MightyPork
- */
-public class TaskTakeScreenshot implements Runnable {
-	
-	private final Screenshot scr;
-	
-	
-	public TaskTakeScreenshot() {
-		GLUtils.checkGLContext();
-		scr = App.gfx().takeScreenshot();
-	}
-	
-	
-	@Override
-	public void run()
-	{
-		final String fname = Support.getTime("yyyy-MM-dd_HH-mm-ss");
-		
-		// generate unique filename
-		File file;
-		int index = 0;
-		while (true) {
-			file = new File(WorkDir.getDir("_screenshot_dir"), fname + (index > 0 ? "-" + index : "") + ".png");
-			if (!file.exists()) break;
-			index++;
-		}
-		
-		Log.f3("Saving screenshot to file: " + file);
-		
-		// save to disk
-		try {
-			scr.save(file);
-		} catch (final IOException e) {
-			Log.e("Failed to save screenshot.", e);
-		}
-	}
-	
-}

src/mightypork/gamecore/render/events/FullscreenToggleRequest.java

@@ -1,16 +1,16 @@
 package mightypork.gamecore.render.events;
 
 
-import mightypork.gamecore.render.RenderModule;
+import mightypork.gamecore.render.GraphicsModule;
 import mightypork.utils.eventbus.BusEvent;
 import mightypork.utils.eventbus.events.flags.SingleReceiverEvent;
 
 
 @SingleReceiverEvent
-public class FullscreenToggleRequest extends BusEvent<RenderModule> {
+public class FullscreenToggleRequest extends BusEvent<GraphicsModule> {
 	
 	@Override
-	protected void handleBy(RenderModule handler)
+	protected void handleBy(GraphicsModule handler)
 	{
 		handler.switchFullscreen();
 	}

src/mightypork/gamecore/render/events/ScreenshotRequest.java

@@ -1,15 +0,0 @@
-package mightypork.gamecore.render.events;
-
-
-import mightypork.utils.eventbus.BusEvent;
-
-
-public class ScreenshotRequest extends BusEvent<ScreenshotRequestListener> {
-	
-	@Override
-	protected void handleBy(ScreenshotRequestListener handler)
-	{
-		handler.onScreenshotRequest();
-	}
-	
-}

src/mightypork/gamecore/render/events/ScreenshotRequestListener.java

@@ -1,7 +0,0 @@
-package mightypork.gamecore.render.events;
-
-
-public interface ScreenshotRequestListener {
-	
-	public void onScreenshotRequest();
-}

src/mightypork/gamecore/resources/AsyncResourceLoader.java

@@ -6,8 +6,9 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.LinkedBlockingQueue;
 
 import mightypork.gamecore.core.events.MainLoopRequest;
+import mightypork.gamecore.core.modules.App;
+import mightypork.utils.Reflect;
 import mightypork.utils.Support;
-import mightypork.utils.eventbus.BusAccess;
 import mightypork.utils.interfaces.Destroyable;
 import mightypork.utils.logging.Log;
 
@@ -21,17 +22,15 @@ public class AsyncResourceLoader extends Thread implements ResourceLoader, Destr
 	
 	private final ExecutorService exs = Executors.newFixedThreadPool(2);
 	
-	private final LinkedBlockingQueue<LazyResource> toLoad = new LinkedBlockingQueue<>();
+	private final LinkedBlockingQueue<DeferredResource> toLoad = new LinkedBlockingQueue<>();
 	private volatile boolean stopped;
-	private BusAccess app;
 	private volatile boolean mainLoopQueuing = true;
 	
 	
 	@Override
-	public synchronized void init(BusAccess app)
+	public synchronized void init()
 	{
-		this.app = app;
-		app.getEventBus().subscribe(this);
+		App.bus().subscribe(this); // FIXME bad
 		setDaemon(true);
 		super.start();
 	}
@@ -49,19 +48,19 @@ public class AsyncResourceLoader extends Thread implements ResourceLoader, Destr
 	
 	
 	@Override
-	public void loadResource(final LazyResource resource)
+	public void loadResource(final DeferredResource resource)
 	{
 		if (resource.isLoaded()) return;
 		
 		// textures & fonts needs to be loaded in main thread
-		if (resource.getClass().isAnnotationPresent(TextureBasedResource.class)) {
+		if (Reflect.hasAnnotation(resource, MustLoadInRenderingContext.class)) {
 			
 			if (!mainLoopQueuing) {
 				// just let it be
 			} else {
 				Log.f3("(loader) Delegating to main thread: " + Support.str(resource));
 				
-				app.getEventBus().send(new MainLoopRequest(new Runnable() {
+				App.bus().send(new MainLoopRequest(new Runnable() {
 					
 					@Override
 					public void run()
@@ -86,7 +85,7 @@ public class AsyncResourceLoader extends Thread implements ResourceLoader, Destr
 		while (!stopped) {
 			
 			try {
-				final LazyResource def = toLoad.take();
+				final DeferredResource def = toLoad.take();
 				if (def == null) continue;
 				
 				if (!def.isLoaded()) {

src/mightypork/gamecore/resources/BaseDeferredResource.java

@@ -16,7 +16,7 @@ import mightypork.utils.string.StringUtil;
  * @author Ondřej Hruška (MightyPork)
  */
 @Alias(name = "Resource")
-public abstract class BaseLazyResource implements LazyResource, Destroyable {
+public abstract class BaseDeferredResource implements DeferredResource, Destroyable {
 	
 	private final String resource;
 	private volatile boolean loadFailed = false;
@@ -27,7 +27,7 @@ public abstract class BaseLazyResource implements LazyResource, Destroyable {
 	 * @param resource resource path / name; this string is later used in
 	 *            loadResource()
 	 */
-	public BaseLazyResource(String resource) {
+	public BaseDeferredResource(String resource) {
 		this.resource = resource;
 	}
 	
@@ -125,8 +125,8 @@ public abstract class BaseLazyResource implements LazyResource, Destroyable {
 	{
 		if (this == obj) return true;
 		if (obj == null) return false;
-		if (!(obj instanceof BaseLazyResource)) return false;
-		final BaseLazyResource other = (BaseLazyResource) obj;
+		if (!(obj instanceof BaseDeferredResource)) return false;
+		final BaseDeferredResource other = (BaseDeferredResource) obj;
 		if (resource == null) {
 			if (other.resource != null) return false;
 		} else if (!resource.equals(other.resource)) return false;

src/mightypork/gamecore/resources/DeferredResource.java

@@ -6,7 +6,7 @@ package mightypork.gamecore.resources;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public interface LazyResource {
+public interface DeferredResource {
 	
 	/**
 	 * Load the actual resource, if not loaded yet.

src/mightypork/gamecore/resources/MustLoadInRenderingContext.java

@@ -15,4 +15,4 @@ import java.lang.annotation.*;
 @Target(ElementType.TYPE)
 @Inherited
 @Documented
-public @interface TextureBasedResource {}
+public @interface MustLoadInRenderingContext {}

src/mightypork/gamecore/resources/Res.java

@@ -1,12 +1,11 @@
 package mightypork.gamecore.resources;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.resources.audio.SoundRegistry;
 import mightypork.gamecore.resources.audio.players.EffectPlayer;
 import mightypork.gamecore.resources.audio.players.LoopPlayer;
 import mightypork.gamecore.resources.fonts.FontRegistry;
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.gamecore.resources.textures.ITexture;
 import mightypork.gamecore.resources.textures.TextureRegistry;
 import mightypork.gamecore.resources.textures.TxQuad;
@@ -32,14 +31,14 @@ public final class Res {
 	 * 
 	 * @param app app access
 	 */
-	public static void init(AppAccess app)
+	public static void init()
 	{
 		if (initialized) return;
 		initialized = true;
 		
-		textures = new TextureRegistry(app);
-		sounds = new SoundRegistry(app);
-		fonts = new FontRegistry(app);
+		textures = new TextureRegistry();
+		sounds = new SoundRegistry();
+		fonts = new FontRegistry();
 	}
 	
 	
@@ -85,7 +84,7 @@ public final class Res {
 	}
 	
 	
-	public static GLFont getFont(String key)
+	public static IFont getFont(String key)
 	{
 		return fonts.getFont(key);
 	}

src/mightypork/gamecore/resources/ResourceLoadRequest.java

@@ -13,13 +13,13 @@ import mightypork.utils.eventbus.events.flags.SingleReceiverEvent;
 @SingleReceiverEvent
 public class ResourceLoadRequest extends BusEvent<ResourceLoader> {
 	
-	private final LazyResource resource;
+	private final DeferredResource resource;
 	
 	
 	/**
 	 * @param resource resource to load
 	 */
-	public ResourceLoadRequest(LazyResource resource) {
+	public ResourceLoadRequest(DeferredResource resource) {
 		this.resource = resource;
 	}
 	

src/mightypork/gamecore/resources/ResourceLoader.java

@@ -1,7 +1,6 @@
 package mightypork.gamecore.resources;
 
 
-import mightypork.utils.eventbus.BusAccess;
 
 
 /**
@@ -16,7 +15,7 @@ public interface ResourceLoader {
 	 * 
 	 * @param resource
 	 */
-	void loadResource(LazyResource resource);
+	void loadResource(DeferredResource resource);
 	
 	
 	/**
@@ -25,5 +24,5 @@ public interface ResourceLoader {
 	 * @param app app the loader works for. The event bus must already be
 	 *            initialized.
 	 */
-	void init(BusAccess app);
+	void init();
 }

src/mightypork/gamecore/resources/audio/AudioModule.java

@@ -0,0 +1,220 @@
+package mightypork.gamecore.resources.audio;
+
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.lwjgl.openal.AL;
+import org.newdawn.slick.openal.SoundStore;
+
+import mightypork.gamecore.backend.BackendModule;
+import mightypork.gamecore.backend.lwjgl.SlickAudio;
+import mightypork.gamecore.core.modules.App;
+import mightypork.gamecore.resources.ResourceLoadRequest;
+import mightypork.gamecore.resources.audio.players.EffectPlayer;
+import mightypork.gamecore.resources.audio.players.LoopPlayer;
+import mightypork.utils.interfaces.Updateable;
+import mightypork.utils.logging.Log;
+import mightypork.utils.math.constraints.vect.Vect;
+
+
+/**
+ * Abstract audio backend module
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public abstract class AudioModule extends BackendModule implements Updateable {
+	
+	/**
+	 * Set listener position
+	 * 
+	 * @param pos listener position
+	 */
+	public abstract void setListenerPos(Vect pos);
+	
+	
+	/**
+	 * Get current listener position
+	 * 
+	 * @return listener position
+	 */
+	public abstract Vect getListenerPos();
+	
+	// -- instance --
+	
+	private final Volume masterVolume = new Volume(1D);
+	private final Volume effectsVolume = new JointVolume(masterVolume);
+	private final Volume loopsVolume = new JointVolume(masterVolume);
+	
+	private final List<LoopPlayer> loopPlayers = new ArrayList<>();
+	private final List<DeferredAudio> resources = new ArrayList<>();
+	
+	
+	@Override
+	public void destroy()
+	{
+		for (final DeferredAudio r : resources) {
+			r.destroy();
+		}
+		
+		deinitSoundSystem();
+	}
+	
+	
+	protected abstract void deinitSoundSystem();
+	
+	
+	@Override
+	public void update(double delta)
+	{
+		for (final Updateable lp : loopPlayers) {
+			lp.update(delta);
+		}
+	}
+	
+	
+	/**
+	 * Create effect resource
+	 * 
+	 * @param resource resource path
+	 * @param pitch default pitch (1 = unchanged)
+	 * @param gain default gain (0-1)
+	 * @return player
+	 */
+	public EffectPlayer createEffect(String resource, double pitch, double gain)
+	{
+		return new EffectPlayer(createResource(resource), pitch, gain, effectsVolume);
+	}
+	
+	
+	/**
+	 * Register loop resource (music / effect loop)
+	 * 
+	 * @param resource resource path
+	 * @param pitch default pitch (1 = unchanged)
+	 * @param gain default gain (0-1)
+	 * @param fadeIn default time for fadeIn
+	 * @param fadeOut default time for fadeOut
+	 * @return player
+	 */
+	public LoopPlayer createLoop(String resource, double pitch, double gain, double fadeIn, double fadeOut)
+	{
+		final LoopPlayer p = new LoopPlayer(createResource(resource), pitch, gain, loopsVolume);
+		p.setFadeTimes(fadeIn, fadeOut);
+		loopPlayers.add(p);
+		return p;
+	}
+	
+	
+	/**
+	 * Create {@link DeferredAudio} for a resource
+	 * 
+	 * @param res a resource name
+	 * @return the resource
+	 * @throws IllegalArgumentException if resource is already registered
+	 */
+	protected DeferredAudio createResource(String res)
+	{
+		final DeferredAudio a = doCreateResource(res);;
+		App.bus().send(new ResourceLoadRequest(a));
+		resources.add(a);
+		return a;
+	}
+	
+	
+	/**
+	 * Create a backend-specific deferred audio resource instance.
+	 * 
+	 * @param res resource path
+	 * @return Deferred Audio
+	 */
+	protected abstract DeferredAudio doCreateResource(String res);
+	
+	
+	/**
+	 * Fade out all loops (ie. for screen transitions)
+	 */
+	public void fadeOutAllLoops()
+	{
+		for (final LoopPlayer p : loopPlayers) {
+			p.fadeOut();
+		}
+	}
+	
+	
+	/**
+	 * Pause all loops (leave volume unchanged)
+	 */
+	public void pauseAllLoops()
+	{
+		for (final LoopPlayer p : loopPlayers) {
+			p.pause();
+		}
+	}
+	
+	
+	/**
+	 * Set level of master volume
+	 * 
+	 * @param d level
+	 */
+	public void setMasterVolume(double d)
+	{
+		masterVolume.set(d);
+	}
+	
+	
+	/**
+	 * Set level of effects volume
+	 * 
+	 * @param d level
+	 */
+	public void setEffectsVolume(double d)
+	{
+		effectsVolume.set(d);
+	}
+	
+	
+	/**
+	 * Set level of music volume
+	 * 
+	 * @param d level
+	 */
+	public void setMusicVolume(double d)
+	{
+		loopsVolume.set(d);
+	}
+	
+	
+	/**
+	 * Get level of master volume
+	 * 
+	 * @return level
+	 */
+	public double getMasterVolume()
+	{
+		return masterVolume.get();
+	}
+	
+	
+	/**
+	 * Get level of effects volume
+	 * 
+	 * @return level
+	 */
+	public double getEffectsVolume()
+	{
+		return effectsVolume.get();
+	}
+	
+	
+	/**
+	 * Get level of music volume
+	 * 
+	 * @return level
+	 */
+	public double getMusicVolume()
+	{
+		return loopsVolume.get();
+	}
+}

src/mightypork/gamecore/resources/audio/DeferredAudio.java

@@ -0,0 +1,24 @@
+package mightypork.gamecore.resources.audio;
+
+
+import mightypork.gamecore.resources.BaseDeferredResource;
+import mightypork.utils.annotations.Alias;
+
+
+/**
+ * Base deferred audio
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+@Alias(name = "Audio")
+public abstract class DeferredAudio extends BaseDeferredResource implements IAudio {
+	
+	/**
+	 * Create deferred primitive audio player
+	 * 
+	 * @param resourceName resource to load when needed
+	 */
+	public DeferredAudio(String resourceName) {
+		super(resourceName);
+	}
+}

src/mightypork/gamecore/resources/audio/IAudio.java

@@ -0,0 +1,99 @@
+package mightypork.gamecore.resources.audio;
+
+
+import mightypork.utils.interfaces.Destroyable;
+import mightypork.utils.math.constraints.vect.Vect;
+
+
+/**
+ * Audio resource interface (backend independent)
+ * 
+ * @author Ondřej Hruška (MightyPork)
+ */
+public interface IAudio extends Destroyable {
+	
+	/**
+	 * Pause loop (remember position and stop playing) - if was looping
+	 */
+	void pauseLoop();
+	
+	
+	/**
+	 * Resume loop (if was paused)
+	 */
+	void resumeLoop();
+	
+	
+	/**
+	 * Adjust gain for the currently playing effect (can be used for fading
+	 * music)
+	 * 
+	 * @param gain gain to set 0..1
+	 */
+	void adjustGain(double gain);
+	
+	
+	/**
+	 * Stop audio playback
+	 */
+	void stop();
+	
+	
+	/**
+	 * @return true if the audio is playing
+	 */
+	boolean isPlaying();
+	
+	
+	/**
+	 * @return trie if the audio is paused
+	 */
+	boolean isPaused();
+	
+	
+	/**
+	 * Play as sound effect at listener position
+	 * 
+	 * @param pitch pitch (1 = default)
+	 * @param gain gain (0-1)
+	 * @param loop looping
+	 */
+	void play(double pitch, double gain, boolean loop);
+	
+	
+	/**
+	 * Play as sound effect at given X-Y position
+	 * 
+	 * @param pitch pitch (1 = default)
+	 * @param gain gain (0-1)
+	 * @param loop looping
+	 * @param x
+	 * @param y
+	 */
+	void play(double pitch, double gain, boolean loop, double x, double y);
+	
+	
+	/**
+	 * Play as sound effect at given position
+	 * 
+	 * @param pitch pitch (1 = default)
+	 * @param gain gain (0-1)
+	 * @param loop looping
+	 * @param x
+	 * @param y
+	 * @param z
+	 */
+	void play(double pitch, double gain, boolean loop, double x, double y, double z);
+	
+	
+	/**
+	 * Play as sound effect at given position
+	 * 
+	 * @param pitch pitch (1 = default)
+	 * @param gain gain (0-1)
+	 * @param loop looping
+	 * @param pos coord
+	 */
+	void play(double pitch, double gain, boolean loop, Vect pos);
+	
+}

src/mightypork/gamecore/resources/audio/LazyAudio.java

@@ -1,249 +0,0 @@
-package mightypork.gamecore.resources.audio;
-
-
-import java.io.IOException;
-import java.io.InputStream;
-
-import mightypork.gamecore.resources.BaseLazyResource;
-import mightypork.utils.annotations.Alias;
-import mightypork.utils.files.FileUtils;
-import mightypork.utils.math.constraints.vect.Vect;
-
-import org.newdawn.slick.openal.Audio;
-import org.newdawn.slick.openal.SoundStore;
-
-
-/**
- * Wrapper class for slick audio
- * 
- * @author Ondřej Hruška (MightyPork)
- */
-@Alias(name = "Audio")
-public class LazyAudio extends BaseLazyResource {
-	
-	private enum PlayMode
-	{
-		EFFECT, MUSIC;
-	}
-	
-	/** Audio resource */
-	private Audio backingAudio = null;
-	
-	// last play options
-	private PlayMode mode = PlayMode.EFFECT;
-	private double pauseLoopPosition = 0;
-	private boolean looping = false;
-	private boolean paused = false;
-	private double lastPlayPitch = 1;
-	private double lastPlayGain = 1;
-	
-	
-	/**
-	 * Create deferred primitive audio player
-	 * 
-	 * @param resourceName resource to load when needed
-	 */
-	public LazyAudio(String resourceName) {
-		super(resourceName);
-	}
-	
-	
-	/**
-	 * Pause loop (remember position and stop playing) - if was looping
-	 */
-	public void pauseLoop()
-	{
-		if (!ensureLoaded()) return;
-		
-		if (isPlaying() && looping) {
-			pauseLoopPosition = backingAudio.getPosition();
-			stop();
-			paused = true;
-		}
-	}
-	
-	
-	/**
-	 * Resume loop (if was paused)
-	 * 
-	 * @return source ID
-	 */
-	public int resumeLoop()
-	{
-		if (!ensureLoaded()) return -1;
-		
-		int source = -1;
-		if (looping && paused) {
-			if (mode == PlayMode.MUSIC) {
-				source = backingAudio.playAsMusic((float) lastPlayPitch, (float) lastPlayGain, true);
-			} else {
-				source = backingAudio.playAsSoundEffect((float) lastPlayPitch, (float) lastPlayGain, true);
-			}
-			backingAudio.setPosition((float) pauseLoopPosition);
-			paused = false;
-		}
-		return source;
-	}
-	
-	
-	@Override
-	protected void loadResource(String resource) throws IOException
-	{
-		final String ext = FileUtils.getExtension(resource);
-		
-		try (final InputStream stream = FileUtils.getResource(resource)) {
-			
-			if (ext.equalsIgnoreCase("ogg")) {
-				backingAudio = SoundStore.get().getOgg(resource, stream);
-				
-			} else if (ext.equalsIgnoreCase("wav")) {
-				backingAudio = SoundStore.get().getWAV(resource, stream);
-				
-			} else if (ext.equalsIgnoreCase("aif")) {
-				backingAudio = SoundStore.get().getAIF(resource, stream);
-				
-			} else if (ext.equalsIgnoreCase("mod")) {
-				backingAudio = SoundStore.get().getMOD(resource, stream);
-				
-			} else {
-				throw new RuntimeException("Invalid audio file extension.");
-			}
-		}
-	}
-	
-	
-	/**
-	 * Stop playing
-	 */
-	public void stop()
-	{
-		if (!isLoaded()) return;
-		
-		backingAudio.stop();
-		paused = false;
-	}
-	
-	
-	/**
-	 * @return true if the audio is playing
-	 */
-	public boolean isPlaying()
-	{
-		if (!isLoaded()) return false;
-		
-		return backingAudio.isPlaying();
-	}
-	
-	
-	/**
-	 * @return trie if the audio is paused
-	 */
-	public boolean isPaused()
-	{
-		if (!isLoaded()) return false;
-		
-		return backingAudio.isPaused();
-	}
-	
-	
-	/**
-	 * Play as sound effect at listener position
-	 * 
-	 * @param pitch pitch (1 = default)
-	 * @param gain gain (0-1)
-	 * @param loop looping
-	 * @return source id
-	 */
-	public int playAsEffect(double pitch, double gain, boolean loop)
-	{
-		return playAsEffect(pitch, gain, loop, SoundSystem.getListener());
-	}
-	
-	
-	/**
-	 * Play as sound effect at given X-Y position
-	 * 
-	 * @param pitch pitch (1 = default)
-	 * @param gain gain (0-1)
-	 * @param loop looping
-	 * @param x
-	 * @param y
-	 * @return source id
-	 */
-	public int playAsEffect(double pitch, double gain, boolean loop, double x, double y)
-	{
-		return playAsEffect(pitch, gain, loop, x, y, SoundSystem.getListener().z());
-	}
-	
-	
-	/**
-	 * Play as sound effect at given position
-	 * 
-	 * @param pitch pitch (1 = default)
-	 * @param gain gain (0-1)
-	 * @param loop looping
-	 * @param x
-	 * @param y
-	 * @param z
-	 * @return source id
-	 */
-	public int playAsEffect(double pitch, double gain, boolean loop, double x, double y, double z)
-	{
-		if (!ensureLoaded()) return -1;
-		
-		this.lastPlayPitch = pitch;
-		this.lastPlayGain = gain;
-		looping = loop;
-		mode = PlayMode.EFFECT;
-		return backingAudio.playAsSoundEffect((float) pitch, (float) gain, loop, (float) x, (float) y, (float) z);
-	}
-	
-	
-	/**
-	 * Play as sound effect at given position
-	 * 
-	 * @param pitch pitch (1 = default)
-	 * @param gain gain (0-1)
-	 * @param loop looping
-	 * @param pos coord
-	 * @return source id
-	 */
-	public int playAsEffect(double pitch, double gain, boolean loop, Vect pos)
-	{
-		if (!ensureLoaded()) return -1;
-		
-		return playAsEffect(pitch, gain, loop, pos.x(), pos.y(), pos.z());
-	}
-	
-	
-	/**
-	 * Play as music using source 0.<br>
-	 * Discouraged, since this does not allow cross-fading.
-	 * 
-	 * @param pitch play pitch
-	 * @param gain play gain
-	 * @param loop looping
-	 * @return source
-	 */
-	public int playAsMusic(double pitch, double gain, boolean loop)
-	{
-		if (!ensureLoaded()) return -1;
-		
-		this.lastPlayPitch = (float) pitch;
-		this.lastPlayGain = (float) gain;
-		looping = loop;
-		mode = PlayMode.MUSIC;
-		return backingAudio.playAsMusic((float) pitch, (float) gain, loop);
-	}
-	
-	
-	@Override
-	public void destroy()
-	{
-		if (!isLoaded() || backingAudio == null) return;
-		
-		backingAudio.release();
-		backingAudio = null;
-	}
-	
-}

src/mightypork/gamecore/resources/audio/SoundRegistry.java

@@ -4,8 +4,7 @@ package mightypork.gamecore.resources.audio;
 import java.util.HashMap;
 import java.util.Map;
 
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.core.modules.AppAccessAdapter;
+import mightypork.gamecore.core.modules.App;
 import mightypork.gamecore.resources.audio.players.EffectPlayer;
 import mightypork.gamecore.resources.audio.players.LoopPlayer;
 
@@ -15,21 +14,12 @@ import mightypork.gamecore.resources.audio.players.LoopPlayer;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public class SoundRegistry extends AppAccessAdapter {
+public class SoundRegistry {
 	
 	private final Map<String, EffectPlayer> effects = new HashMap<>();
 	private final Map<String, LoopPlayer> loops = new HashMap<>();
 	
 	
-	/**
-	 * @param app app access
-	 */
-	public SoundRegistry(AppAccess app) {
-		super(app);
-		if (getSoundSystem() == null) throw new NullPointerException("SoundSystem cannot be null.");
-	}
-	
-	
 	/**
 	 * Register effect resource
 	 * 
@@ -40,7 +30,7 @@ public class SoundRegistry extends AppAccessAdapter {
 	 */
 	public void addEffect(String key, String resource, double pitch, double gain)
 	{
-		effects.put(key, getSoundSystem().createEffect(resource, pitch, gain));
+		effects.put(key, App.audio().createEffect(resource, pitch, gain));
 	}
 	
 	
@@ -56,7 +46,7 @@ public class SoundRegistry extends AppAccessAdapter {
 	 */
 	public void addLoop(String key, String resource, double pitch, double gain, double fadeIn, double fadeOut)
 	{
-		loops.put(key, getSoundSystem().createLoop(resource, pitch, gain, fadeIn, fadeOut));
+		loops.put(key, App.audio().createLoop(resource, pitch, gain, fadeIn, fadeOut));
 	}
 	
 	

src/mightypork/gamecore/resources/audio/SoundSystem.java

@@ -5,12 +5,14 @@ import java.nio.FloatBuffer;
 import java.util.ArrayList;
 import java.util.List;
 
-import mightypork.gamecore.core.modules.AppAccess;
+import mightypork.gamecore.backend.lwjgl.SlickAudio;
+import mightypork.gamecore.core.modules.App;
 import mightypork.gamecore.resources.ResourceLoadRequest;
 import mightypork.gamecore.resources.audio.players.EffectPlayer;
 import mightypork.gamecore.resources.audio.players.LoopPlayer;
 import mightypork.gamecore.util.BufferHelper;
-import mightypork.utils.eventbus.clients.RootBusNode;
+import mightypork.utils.eventbus.clients.BusNode;
+import mightypork.utils.interfaces.Destroyable;
 import mightypork.utils.interfaces.Updateable;
 import mightypork.utils.logging.Log;
 import mightypork.utils.math.constraints.vect.Vect;
@@ -26,7 +28,7 @@ import org.newdawn.slick.openal.SoundStore;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public class SoundSystem extends RootBusNode implements Updateable {
+public class SoundSystem extends BusNode implements Updateable, Destroyable {
 	
 	private static final Vect INITIAL_LISTENER_POS = Vect.ZERO;
 	private static final int MAX_SOURCES = 256;
@@ -72,14 +74,13 @@ public class SoundSystem extends RootBusNode implements Updateable {
 	private final Volume loopsVolume = new JointVolume(masterVolume);
 	
 	private final List<LoopPlayer> loopPlayers = new ArrayList<>();
-	private final List<LazyAudio> resources = new ArrayList<>();
+	private final List<DeferredAudio> resources = new ArrayList<>();
 	
 	
 	/**
-	 * @param app app access
+	 * @param busAccess app access
 	 */
-	public SoundSystem(AppAccess app) {
-		super(app);
+	public SoundSystem() {
 		
 		if (!soundSystemInited) {
 			soundSystemInited = true;
@@ -89,7 +90,7 @@ public class SoundSystem extends RootBusNode implements Updateable {
 				SoundStore.get().init();
 				setListener(INITIAL_LISTENER_POS);
 				
-				getEventBus().send(new AudioReadyEvent());
+				App.bus().send(new AudioReadyEvent());
 			} catch (final Throwable t) {
 				Log.e("Error initializing sound system.", t);
 			}
@@ -98,9 +99,9 @@ public class SoundSystem extends RootBusNode implements Updateable {
 	
 	
 	@Override
-	public void deinit()
+	public void destroy()
 	{
-		for (final LazyAudio r : resources) {
+		for (final DeferredAudio r : resources) {
 			r.destroy();
 		}
 		
@@ -152,16 +153,16 @@ public class SoundSystem extends RootBusNode implements Updateable {
 	
 	
 	/**
-	 * Create {@link LazyAudio} for a resource
+	 * Create {@link DeferredAudio} for a resource
 	 * 
 	 * @param res a resource name
 	 * @return the resource
 	 * @throws IllegalArgumentException if resource is already registered
 	 */
-	private LazyAudio createResource(String res)
+	private DeferredAudio createResource(String res)
 	{
-		final LazyAudio a = new LazyAudio(res);
-		getEventBus().send(new ResourceLoadRequest(a));
+		final DeferredAudio a = new SlickAudio(res);
+		App.bus().send(new ResourceLoadRequest(a));
 		resources.add(a);
 		return a;
 	}

src/mightypork/gamecore/resources/audio/players/BaseAudioPlayer.java

@@ -1,7 +1,7 @@
 package mightypork.gamecore.resources.audio.players;
 
 
-import mightypork.gamecore.resources.audio.LazyAudio;
+import mightypork.gamecore.resources.audio.DeferredAudio;
 import mightypork.gamecore.resources.audio.Volume;
 import mightypork.utils.interfaces.Destroyable;
 
@@ -14,7 +14,7 @@ import mightypork.utils.interfaces.Destroyable;
 public abstract class BaseAudioPlayer implements Destroyable {
 	
 	/** the track */
-	private final LazyAudio audio;
+	private final DeferredAudio audio;
 	
 	/** base gain for sfx */
 	private final double baseGain;
@@ -32,7 +32,7 @@ public abstract class BaseAudioPlayer implements Destroyable {
 	 * @param baseGain base gain (volume multiplier)
 	 * @param volume colume control
 	 */
-	public BaseAudioPlayer(LazyAudio track, double basePitch, double baseGain, Volume volume) {
+	public BaseAudioPlayer(DeferredAudio track, double basePitch, double baseGain, Volume volume) {
 		this.audio = track;
 		
 		this.baseGain = baseGain;
@@ -54,7 +54,7 @@ public abstract class BaseAudioPlayer implements Destroyable {
 	/**
 	 * @return audio resource
 	 */
-	protected LazyAudio getAudio()
+	protected DeferredAudio getAudio()
 	{
 		return audio;
 	}
@@ -66,7 +66,7 @@ public abstract class BaseAudioPlayer implements Destroyable {
 	 * @param multiplier extra volume adjustment
 	 * @return computed gain
 	 */
-	protected double getGain(double multiplier)
+	protected double computeGain(double multiplier)
 	{
 		return baseGain * gainMultiplier.get() * multiplier;
 	}
@@ -78,7 +78,7 @@ public abstract class BaseAudioPlayer implements Destroyable {
 	 * @param multiplier pitch adjustment
 	 * @return computed pitch
 	 */
-	protected double getPitch(double multiplier)
+	protected double computePitch(double multiplier)
 	{
 		return basePitch * multiplier;
 	}

src/mightypork/gamecore/resources/audio/players/EffectPlayer.java

@@ -1,7 +1,7 @@
 package mightypork.gamecore.resources.audio.players;
 
 
-import mightypork.gamecore.resources.audio.LazyAudio;
+import mightypork.gamecore.resources.audio.DeferredAudio;
 import mightypork.gamecore.resources.audio.Volume;
 import mightypork.utils.math.constraints.vect.Vect;
 
@@ -19,7 +19,7 @@ public class EffectPlayer extends BaseAudioPlayer {
 	 * @param baseGain base gain (volume multiplier)
 	 * @param volume volume control
 	 */
-	public EffectPlayer(LazyAudio track, double basePitch, double baseGain, Volume volume) {
+	public EffectPlayer(DeferredAudio track, double basePitch, double baseGain, Volume volume) {
 		super(track, (float) basePitch, (float) baseGain, volume);
 	}
 	
@@ -29,13 +29,12 @@ public class EffectPlayer extends BaseAudioPlayer {
 	 * 
 	 * @param pitch play pitch
 	 * @param gain play gain
-	 * @return source id
 	 */
-	public int play(double pitch, double gain)
+	public void play(double pitch, double gain)
 	{
-		if (!hasAudio()) return -1;
+		if (!hasAudio()) return;
 		
-		return getAudio().playAsEffect(getPitch(pitch), getGain(gain), false);
+		getAudio().play(computePitch(pitch), computeGain(gain), false);
 	}
 	
 	
@@ -43,11 +42,10 @@ public class EffectPlayer extends BaseAudioPlayer {
 	 * Play at listener
 	 * 
 	 * @param gain play gain
-	 * @return source id
 	 */
-	public int play(double gain)
+	public void play(double gain)
 	{
-		return play(1, gain);
+		play(1, gain);
 	}
 	
 	
@@ -57,13 +55,12 @@ public class EffectPlayer extends BaseAudioPlayer {
 	 * @param pitch play pitch
 	 * @param gain play gain
 	 * @param pos play position
-	 * @return source id
 	 */
-	public int play(double pitch, double gain, Vect pos)
+	public void play(double pitch, double gain, Vect pos)
 	{
-		if (!hasAudio()) return -1;
+		if (!hasAudio()) return;
 		
-		return getAudio().playAsEffect(getPitch(pitch), getGain(gain), false, pos);
+		getAudio().play(computePitch(pitch), computeGain(gain), false, pos);
 	}
 	
 }

src/mightypork/gamecore/resources/audio/players/LoopPlayer.java

@@ -1,7 +1,7 @@
 package mightypork.gamecore.resources.audio.players;
 
 
-import mightypork.gamecore.resources.audio.LazyAudio;
+import mightypork.gamecore.resources.audio.DeferredAudio;
 import mightypork.gamecore.resources.audio.Volume;
 import mightypork.utils.interfaces.Pauseable;
 import mightypork.utils.interfaces.Updateable;
@@ -40,7 +40,7 @@ public class LoopPlayer extends BaseAudioPlayer implements Updateable, Pauseable
 	 * @param baseGain base gain (volume multiplier)
 	 * @param volume volume control
 	 */
-	public LoopPlayer(LazyAudio track, double basePitch, double baseGain, Volume volume) {
+	public LoopPlayer(DeferredAudio track, double basePitch, double baseGain, Volume volume) {
 		super(track, (float) basePitch, (float) baseGain, volume);
 		
 		paused = true;
@@ -63,7 +63,7 @@ public class LoopPlayer extends BaseAudioPlayer implements Updateable, Pauseable
 	private void initLoop()
 	{
 		if (hasAudio() && sourceID == -1) {
-			sourceID = getAudio().playAsEffect(getPitch(1), getGain(1), true);
+			getAudio().play(computePitch(1), computeGain(1), true);
 			getAudio().pauseLoop();
 		}
 	}
@@ -95,10 +95,9 @@ public class LoopPlayer extends BaseAudioPlayer implements Updateable, Pauseable
 		
 		initLoop();
 		
-		sourceID = getAudio().resumeLoop();
 		paused = false;
 		
-		adjustGain(getGain(fadeAnim.value()));
+		getAudio().adjustGain(computeGain(fadeAnim.value()));
 	}
 	
 	
@@ -111,9 +110,9 @@ public class LoopPlayer extends BaseAudioPlayer implements Updateable, Pauseable
 		
 		fadeAnim.update(delta);
 		
-		final double gain = getGain(fadeAnim.value());
+		final double gain = computeGain(fadeAnim.value());
 		if (!paused && gain != lastUpdateGain) {
-			adjustGain(gain);
+			getAudio().adjustGain(gain);
 			lastUpdateGain = gain;
 		}
 		
@@ -121,12 +120,6 @@ public class LoopPlayer extends BaseAudioPlayer implements Updateable, Pauseable
 	}
 	
 	
-	private void adjustGain(double gain)
-	{
-		AL10.alSourcef(sourceID, AL10.AL_GAIN, (float) gain);
-	}
-	
-	
 	/**
 	 * Resume if paused, and fade in (pick up from current volume).
 	 * 

src/mightypork/gamecore/resources/fonts/FontRegistry.java

@@ -3,10 +3,10 @@ package mightypork.gamecore.resources.fonts;
 
 import java.util.HashMap;
 
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.core.modules.AppAccessAdapter;
+import mightypork.gamecore.core.modules.App;
 import mightypork.gamecore.resources.ResourceLoadRequest;
 import mightypork.gamecore.resources.fonts.impl.LazyFont;
+import mightypork.utils.eventbus.clients.BusNode;
 
 import org.newdawn.slick.opengl.Texture;
 
@@ -16,16 +16,9 @@ import org.newdawn.slick.opengl.Texture;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public class FontRegistry extends AppAccessAdapter {
+public class FontRegistry extends BusNode {
 	
-	/**
-	 * @param app app access
-	 */
-	public FontRegistry(AppAccess app) {
-		super(app);
-	}
-	
-	private final HashMap<String, GLFont> fonts = new HashMap<>();
+	private final HashMap<String, IFont> fonts = new HashMap<>();
 	private final HashMap<String, String> aliases = new HashMap<>();
 	
 	
@@ -37,19 +30,19 @@ public class FontRegistry extends AppAccessAdapter {
 	 */
 	public void addFont(String key, LazyFont font)
 	{
-		getEventBus().send(new ResourceLoadRequest(font));
+		App.bus().send(new ResourceLoadRequest(font));
 		
 		fonts.put(key, font);
 	}
 	
 	
 	/**
-	 * Add a {@link GLFont} to the bank.
+	 * Add a {@link IFont} to the bank.
 	 * 
 	 * @param key font key
 	 * @param font font instance
 	 */
-	public void addFont(String key, GLFont font)
+	public void addFont(String key, IFont font)
 	{
 		fonts.put(key, font);
 	}
@@ -73,9 +66,9 @@ public class FontRegistry extends AppAccessAdapter {
 	 * @param key texture key
 	 * @return the texture
 	 */
-	public GLFont getFont(String key)
+	public IFont getFont(String key)
 	{
-		GLFont f = fonts.get(key);
+		IFont f = fonts.get(key);
 		
 		if (f == null) f = fonts.get(aliases.get(key));
 		

src/mightypork/gamecore/resources/fonts/FontRenderer.java

@@ -16,7 +16,7 @@ import mightypork.utils.math.constraints.vect.Vect;
  */
 public class FontRenderer {
 	
-	private GLFont font;
+	private IFont font;
 	
 	private Color color;
 	
@@ -24,7 +24,7 @@ public class FontRenderer {
 	/**
 	 * @param font used font
 	 */
-	public FontRenderer(GLFont font) {
+	public FontRenderer(IFont font) {
 		this(font, RGB.WHITE);
 	}
 	
@@ -33,7 +33,7 @@ public class FontRenderer {
 	 * @param font used font
 	 * @param color drawing color
 	 */
-	public FontRenderer(GLFont font, Color color) {
+	public FontRenderer(IFont font, Color color) {
 		this.font = font;
 		this.color = color;
 	}
@@ -76,7 +76,7 @@ public class FontRenderer {
 	 * 
 	 * @param font font to use for drawing
 	 */
-	public void setFont(GLFont font)
+	public void setFont(IFont font)
 	{
 		this.font = font;
 	}

src/mightypork/gamecore/resources/fonts/Glyphs.java

@@ -2,7 +2,7 @@ package mightypork.gamecore.resources.fonts;
 
 
 /**
- * Glyph tables.
+ * Glyph tables, can be used for font loading.
  * 
  * @author Ondřej Hruška (MightyPork)
  */

src/mightypork/gamecore/resources/fonts/IFont.java

@@ -10,7 +10,7 @@ import mightypork.utils.math.constraints.vect.Vect;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public interface GLFont {
+public interface IFont {
 	
 	/**
 	 * Draw without scaling at (0, 0) in given color.

src/mightypork/gamecore/resources/fonts/impl/LazyFont.java

@@ -6,9 +6,9 @@ import java.awt.FontFormatException;
 import java.io.IOException;
 import java.io.InputStream;
 
-import mightypork.gamecore.resources.BaseLazyResource;
-import mightypork.gamecore.resources.TextureBasedResource;
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.BaseDeferredResource;
+import mightypork.gamecore.resources.MustLoadInRenderingContext;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.gamecore.resources.textures.FilterMode;
 import mightypork.utils.annotations.Alias;
 import mightypork.utils.files.FileUtils;
@@ -21,9 +21,9 @@ import mightypork.utils.math.constraints.vect.Vect;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-@TextureBasedResource
+@MustLoadInRenderingContext
 @Alias(name = "Font")
-public class LazyFont extends BaseLazyResource implements GLFont {
+public class LazyFont extends BaseDeferredResource implements IFont {
 	
 	public static enum FontStyle
 	{
@@ -37,7 +37,7 @@ public class LazyFont extends BaseLazyResource implements GLFont {
 		}
 	}
 	
-	private GLFont font = null;
+	private IFont font = null;
 	private double size;
 	private FontStyle style;
 	private String chars;
@@ -140,7 +140,7 @@ public class LazyFont extends BaseLazyResource implements GLFont {
 			
 			return awtFont;
 		} catch (final FontFormatException e) {
-			throw new IOException("Could not load font,  bad format.", e);
+			throw new IOException("Could not load font, bad format.", e);
 		}
 	}
 	

src/mightypork/gamecore/resources/fonts/impl/TextureBackedFont.java

@@ -18,8 +18,9 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.gamecore.resources.textures.FilterMode;
+import mightypork.utils.exceptions.IllegalValueException;
 import mightypork.utils.logging.Log;
 import mightypork.utils.math.color.Color;
 import mightypork.utils.math.constraints.vect.Vect;
@@ -40,7 +41,7 @@ import org.newdawn.slick.opengl.GLUtils;
  * @author David Aaron Muhar (bobjob)
  * @author Ondřej Hruška (MightyPork)
  */
-public class TextureBackedFont implements GLFont {
+public class TextureBackedFont implements IFont {
 	
 	private class CharTile {
 		
@@ -313,9 +314,21 @@ public class TextureBackedFont implements GLFont {
 			
 			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
 			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+
+			final int filtering;
+			switch (filter) {
+				case NEAREST:
+					filtering = GL_NEAREST;
+					break;
+				case LINEAR:
+					filtering = GL_LINEAR;
+					break;
+				default:
+					throw new IllegalValueException("Unsupported filtering mode.");
+			}
 			
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter.num);
-			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter.num);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filtering);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filtering);
 			
 			GLU.gluBuild2DMipmaps(GL_TEXTURE_2D, internalFormat, width, height, format, GL_UNSIGNED_BYTE, byteBuffer);
 			return textureId.get(0);
@@ -385,9 +398,21 @@ public class TextureBackedFont implements GLFont {
 		
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+
+		final int filtering;
+		switch (filter) {
+			case NEAREST:
+				filtering = GL_NEAREST;
+				break;
+			case LINEAR:
+				filtering = GL_LINEAR;
+				break;
+			default:
+				throw new IllegalValueException("Unsupported filtering mode.");
+		}
 		
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter.num);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter.num);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filtering);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filtering);
 		
 		glColor4d(color.r(), color.g(), color.b(), color.a());
 		

src/mightypork/gamecore/resources/textures/DeferredTexture.java

@@ -1,8 +1,8 @@
 package mightypork.gamecore.resources.textures;
 
 
-import mightypork.gamecore.resources.BaseLazyResource;
-import mightypork.gamecore.resources.TextureBasedResource;
+import mightypork.gamecore.resources.BaseDeferredResource;
+import mightypork.gamecore.resources.MustLoadInRenderingContext;
 import mightypork.utils.annotations.Alias;
 import mightypork.utils.math.constraints.rect.Rect;
 
@@ -13,8 +13,8 @@ import mightypork.utils.math.constraints.rect.Rect;
  * @author Ondřej Hruška (MightyPork)
  */
 @Alias(name = "Texture")
-@TextureBasedResource
-public abstract class LazyTexture extends BaseLazyResource implements ITexture {
+@MustLoadInRenderingContext
+public abstract class DeferredTexture extends BaseDeferredResource implements ITexture {
 	
 	protected FilterMode filter = FilterMode.NEAREST;
 	protected WrapMode wrap = WrapMode.CLAMP;
@@ -23,7 +23,7 @@ public abstract class LazyTexture extends BaseLazyResource implements ITexture {
 	/**
 	 * @param resourcePath resource path
 	 */
-	public LazyTexture(String resourcePath) {
+	public DeferredTexture(String resourcePath) {
 		super(resourcePath);
 	}
 	

src/mightypork/gamecore/resources/textures/FilterMode.java

@@ -1,9 +1,6 @@
 package mightypork.gamecore.resources.textures;
 
 
-import org.lwjgl.opengl.GL11;
-
-
 /**
  * Texture filtering mode
  * 
@@ -11,12 +8,5 @@ import org.lwjgl.opengl.GL11;
  */
 public enum FilterMode
 {
-	LINEAR(GL11.GL_LINEAR), NEAREST(GL11.GL_NEAREST);
-	
-	public final int num;
-	
-	
-	private FilterMode(int gl) {
-		this.num = gl;
-	}
+	LINEAR, NEAREST;
 }

src/mightypork/gamecore/resources/textures/ITexture.java

@@ -6,7 +6,7 @@ import mightypork.utils.math.constraints.rect.Rect;
 
 
 /**
- * Texture with filter and wrap mode
+ * Texture interface, backend independent
  * 
  * @author Ondřej Hruška (MightyPork)
  */
@@ -45,28 +45,6 @@ public interface ITexture extends Destroyable {
 	QuadGrid grid(int x, int y);
 	
 	
-	/**
-	 * @return OpenGL texture ID
-	 */
-	int getTextureID();
-	
-	
-	/**
-	 * Get the height of the texture, 0..1.<br>
-	 * 
-	 * @return height 0..1
-	 */
-	float getHeight01();
-	
-	
-	/**
-	 * Get the width of the texture, 0..1.<br>
-	 * 
-	 * @return width 0..1
-	 */
-	float getWidth01();
-	
-	
 	/**
 	 * @return source image width (corresponding to width01)
 	 */
@@ -79,12 +57,6 @@ public interface ITexture extends Destroyable {
 	int getImageHeight();
 	
 	
-	/**
-	 * Bind to GL context, applying the filters prescribed.
-	 */
-	void bind();
-	
-	
 	/**
 	 * @return true if the image is RGBA
 	 */

src/mightypork/gamecore/resources/textures/TextureRegistry.java

@@ -5,8 +5,6 @@ import java.util.HashMap;
 import java.util.Map;
 
 import mightypork.gamecore.core.modules.App;
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.core.modules.AppAccessAdapter;
 import mightypork.gamecore.resources.ResourceLoadRequest;
 import mightypork.utils.exceptions.KeyAlreadyExistsException;
 import mightypork.utils.math.constraints.rect.Rect;
@@ -18,20 +16,12 @@ import mightypork.utils.math.constraints.rect.Rect;
  * 
  * @author Ondřej Hruška (MightyPork)
  */
-public class TextureRegistry extends AppAccessAdapter {
+public class TextureRegistry {
 	
 	private final Map<String, ITexture> textures = new HashMap<>();
 	private final Map<String, TxSheet> sheets = new HashMap<>();
 	
 	
-	/**
-	 * @param app app access
-	 */
-	public TextureRegistry(AppAccess app) {
-		super(app);
-	}
-	
-	
 	/**
 	 * Load a texture from resource, without a key. This texture will not be
 	 * added to the bank.
@@ -61,11 +51,11 @@ public class TextureRegistry extends AppAccessAdapter {
 	{
 		if (key != null) if (textures.containsKey(key)) throw new KeyAlreadyExistsException();
 		
-		final LazyTexture texture = App.gfx().getLazyTexture(resourcePath);
+		final DeferredTexture texture = App.gfx().getLazyTexture(resourcePath);
 		texture.setFilter(filter);
 		texture.setWrap(wrap);
 		
-		getEventBus().send(new ResourceLoadRequest(texture));
+		App.bus().send(new ResourceLoadRequest(texture));
 		
 		if (key != null) {
 			textures.put(key, texture);

src/mightypork/gamecore/resources/textures/WrapMode.java

@@ -1,9 +1,6 @@
 package mightypork.gamecore.resources.textures;
 
 
-import org.lwjgl.opengl.GL11;
-
-
 /**
  * Texture wrap mode
  * 
@@ -11,12 +8,5 @@ import org.lwjgl.opengl.GL11;
  */
 public enum WrapMode
 {
-	CLAMP(GL11.GL_CLAMP), REPEAT(GL11.GL_REPEAT);
-	
-	public final int num;
-	
-	
-	private WrapMode(int gl) {
-		this.num = gl;
-	}
+	CLAMP, REPEAT;
 }

src/mightypork/rogue/RogueApp.java

@@ -1,8 +1,6 @@
 package mightypork.rogue;
 
 
-import java.io.File;
-
 import mightypork.gamecore.backend.lwjgl.LwjglBackend;
 import mightypork.gamecore.core.config.Config;
 import mightypork.gamecore.core.events.MainLoopRequest;
@@ -11,9 +9,9 @@ import mightypork.gamecore.core.events.UserQuitRequest;
 import mightypork.gamecore.core.modules.AppInitOptions;
 import mightypork.gamecore.core.modules.BaseApp;
 import mightypork.gamecore.gui.screens.ScreenRegistry;
+import mightypork.gamecore.input.Edge;
 import mightypork.gamecore.input.InputSystem;
-import mightypork.gamecore.input.KeyStroke.Edge;
-import mightypork.gamecore.render.RenderModule;
+import mightypork.gamecore.render.GraphicsModule;
 import mightypork.gamecore.render.events.FullscreenToggleRequest;
 import mightypork.gamecore.render.events.ScreenshotRequest;
 import mightypork.gamecore.render.events.ScreenshotRequestListener;
@@ -70,7 +68,7 @@ public final class RogueApp extends BaseApp implements ViewportChangeListener, S
 	
 	
 	@Override
-	protected void initDisplay(RenderModule gfx)
+	protected void initDisplay(GraphicsModule gfx)
 	{
 		// init based on config
 		final int w = Config.getValue("display.width");

src/mightypork/rogue/RogueKeys.java

@@ -10,41 +10,41 @@ public class RogueKeys implements KeySetup {
 	@Override
 	public void addKeys(KeyOpts keys)
 	{
-		keys.add("global.quit", "CTRL+Q", "Quit the game");
-		keys.add("global.quit_force", "CTRL+SHIFT+Q", "Quit the game without asking, low-level");
+		keys.addKey("global.quit", "CTRL+Q", "Quit the game");
+		keys.addKey("global.quit_force", "CTRL+SHIFT+Q", "Quit the game without asking, low-level");
 		
-		keys.add("global.screenshot", "F2", "Take screenshot (save into working directory)");
-		keys.add("global.fullscreen", "F11", "Toggle fullscreen");
-		keys.add("global.fps_meter", "F3", "Toggle FPS meter overlay");
+		keys.addKey("global.screenshot", "F2", "Take screenshot (save into working directory)");
+		keys.addKey("global.fullscreen", "F11", "Toggle fullscreen");
+		keys.addKey("global.fps_meter", "F3", "Toggle FPS meter overlay");
 		
-		keys.add("general.close", "ESC", "Leave a dialog or screen");
-		keys.add("general.cancel", "ESC", "\"Cancel\" option in dialogs");
-		keys.add("general.confirm", "ENTER", "\"Confirm\" option in dialogs");
-		keys.add("general.yes", "Y", "\"Yes\" option in dialogs");
-		keys.add("general.no", "N", "\"No\" option in dialogs");
+		keys.addKey("general.close", "ESC", "Leave a dialog or screen");
+		keys.addKey("general.cancel", "ESC", "\"Cancel\" option in dialogs");
+		keys.addKey("general.confirm", "ENTER", "\"Confirm\" option in dialogs");
+		keys.addKey("general.yes", "Y", "\"Yes\" option in dialogs");
+		keys.addKey("general.no", "N", "\"No\" option in dialogs");
 		
-		keys.add("game.quit", "ESC", "Quit to menu");
-		keys.add("game.save", "CTRL+S", "Save to file");
-		keys.add("game.load", "CTRL+L", "Load from file");
-		keys.add("game.zoom", "Z", "Toggle zoom");
-		keys.add("game.minimap", "M", "Toggle minimap");
-		keys.add("game.eat", "E", "Eat smallest food item");
-		keys.add("game.drop", "D", "Drop last picked item");
-		keys.add("game.inventory", "I", "Toggle inventory view");
-		keys.add("game.pause", "P", "Pause the game");
+		keys.addKey("game.quit", "ESC", "Quit to menu");
+		keys.addKey("game.save", "CTRL+S", "Save to file");
+		keys.addKey("game.load", "CTRL+L", "Load from file");
+		keys.addKey("game.zoom", "Z", "Toggle zoom");
+		keys.addKey("game.minimap", "M", "Toggle minimap");
+		keys.addKey("game.eat", "E", "Eat smallest food item");
+		keys.addKey("game.drop", "D", "Drop last picked item");
+		keys.addKey("game.inventory", "I", "Toggle inventory view");
+		keys.addKey("game.pause", "P", "Pause the game");
 		
-		keys.add("game.walk.up", "UP", "Walk north");
-		keys.add("game.walk.down", "DOWN", "Walk south");
-		keys.add("game.walk.left", "LEFT", "Walk west");
-		keys.add("game.walk.right", "RIGHT", "Walk east");
+		keys.addKey("game.walk.up", "UP", "Walk north");
+		keys.addKey("game.walk.down", "DOWN", "Walk south");
+		keys.addKey("game.walk.left", "LEFT", "Walk west");
+		keys.addKey("game.walk.right", "RIGHT", "Walk east");
 		
-		keys.add("game.cheat.xray", "CTRL+SHIFT+X", "Cheat to see unexplored tiles");
+		keys.addKey("game.cheat.xray", "CTRL+SHIFT+X", "Cheat to see unexplored tiles");
 		
-		keys.add("game.inv.use", "E", "Use (eat or equip) the selected item");
-		keys.add("game.inv.drop", "D", "Drop the selected item");
-		keys.add("game.inv.move.left", "LEFT", "Move inventory cursor left");
-		keys.add("game.inv.move.right", "RIGHT", "Move inventory cursor right");
-		keys.add("game.inv.move.up", "UP", "Move inventory cursor up");
-		keys.add("game.inv.move.down", "DOWN", "Move inventory cursor down");
+		keys.addKey("game.inv.use", "E", "Use (eat or equip) the selected item");
+		keys.addKey("game.inv.drop", "D", "Drop the selected item");
+		keys.addKey("game.inv.move.left", "LEFT", "Move inventory cursor left");
+		keys.addKey("game.inv.move.right", "RIGHT", "Move inventory cursor right");
+		keys.addKey("game.inv.move.up", "UP", "Move inventory cursor up");
+		keys.addKey("game.inv.move.down", "DOWN", "Move inventory cursor down");
 	}
 }

src/mightypork/rogue/RogueStateManager.java

@@ -1,8 +1,6 @@
 package mightypork.rogue;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
-import mightypork.gamecore.core.modules.AppModule;
 import mightypork.gamecore.gui.screens.impl.CrossfadeRequest;
 import mightypork.utils.logging.Log;
 

src/mightypork/rogue/screens/FpsOverlay.java

@@ -3,14 +3,13 @@ package mightypork.rogue.screens;
 
 import mightypork.gamecore.core.config.Config;
 import mightypork.gamecore.core.modules.App;
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.Action;
 import mightypork.gamecore.gui.AlignX;
 import mightypork.gamecore.gui.components.painters.TextPainter;
 import mightypork.gamecore.gui.screens.Overlay;
-import mightypork.gamecore.input.KeyStroke.Edge;
+import mightypork.gamecore.input.Edge;
 import mightypork.gamecore.resources.Res;
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.utils.math.color.pal.RGB;
 import mightypork.utils.math.constraints.num.Num;
 import mightypork.utils.math.constraints.rect.RectBound;
@@ -43,7 +42,7 @@ public class FpsOverlay extends Overlay {
 			}
 		});
 		
-		final GLFont font = Res.getFont("thin");
+		final IFont font = Res.getFont("thin");
 		
 		final Num h = root.height();
 		final RectBound constraint = root.shrink(h.perc(3)).topRight().startRect().growDown(h.perc(5).max(16));

src/mightypork/rogue/screens/LoadingOverlay.java

@@ -1,7 +1,6 @@
 package mightypork.rogue.screens;
 
 
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.AlignX;
 import mightypork.gamecore.gui.components.painters.QuadPainter;
 import mightypork.gamecore.gui.components.painters.TextPainter;

src/mightypork/rogue/screens/RogueScreen.java

@@ -3,7 +3,6 @@ package mightypork.rogue.screens;
 
 import mightypork.gamecore.core.events.UserQuitRequest;
 import mightypork.gamecore.core.events.UserQuitRequestListener;
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.screens.LayeredScreen;
 import mightypork.rogue.RogueStateManager.RogueState;
 import mightypork.rogue.events.RogueStateRequest;

src/mightypork/rogue/screens/game/IngameNav.java

@@ -2,7 +2,6 @@ package mightypork.rogue.screens.game;
 
 
 import mightypork.gamecore.core.modules.App;
-import mightypork.gamecore.core.modules.AppAccess;
 import mightypork.gamecore.gui.AlignX;
 import mightypork.gamecore.gui.components.LayoutComponent;
 import mightypork.gamecore.gui.components.layout.FlowColumnLayout;

src/mightypork/rogue/screens/game/LayerAskSave.java

@@ -12,9 +12,9 @@ import mightypork.gamecore.gui.components.layout.linear.LinearLayout;
 import mightypork.gamecore.gui.components.painters.QuadPainter;
 import mightypork.gamecore.gui.components.painters.TextPainter;
 import mightypork.gamecore.gui.screens.impl.FadingLayer;
-import mightypork.gamecore.input.KeyStroke.Edge;
+import mightypork.gamecore.input.Edge;
 import mightypork.gamecore.resources.Res;
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.rogue.screens.game.ScreenGame.GScrState;
 import mightypork.rogue.world.WorldProvider;
 import mightypork.utils.logging.Log;
@@ -53,7 +53,7 @@ public class LayerAskSave extends FadingLayer {
 		qp.setRect(root);
 		root.add(qp);
 		
-		final GLFont thick_font = Res.getFont("thick");
+		final IFont thick_font = Res.getFont("thick");
 		
 		final RowLayout rl = new RowLayout(root, 2);
 		rl.setRect(root.shrink(Num.ZERO, root.height().perc(40)).moveY(root.height().perc(-10)));

src/mightypork/rogue/screens/game/LayerDeath.java

@@ -14,9 +14,9 @@ import mightypork.gamecore.gui.components.painters.ImagePainter;
 import mightypork.gamecore.gui.components.painters.QuadPainter;
 import mightypork.gamecore.gui.components.painters.TextPainter;
 import mightypork.gamecore.gui.screens.impl.FadingLayer;
-import mightypork.gamecore.input.KeyStroke.Edge;
+import mightypork.gamecore.input.Edge;
 import mightypork.gamecore.resources.Res;
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.rogue.RogueStateManager.RogueState;
 import mightypork.rogue.events.RogueStateRequest;
 import mightypork.rogue.screens.game.ScreenGame.GScrState;
@@ -36,7 +36,7 @@ public class LayerDeath extends FadingLayer {
 		qp.setRect(root);
 		root.add(qp);
 		
-		final GLFont thick_font = Res.getFont("thick");
+		final IFont thick_font = Res.getFont("thick");
 		
 		final RowLayout rl = new RowLayout(root, 5);
 		rl.setRect(root.shrink(Num.ZERO, root.height().perc(15)));

src/mightypork/rogue/screens/game/LayerInv.java

@@ -9,8 +9,8 @@ import mightypork.gamecore.gui.components.layout.GridLayout;
 import mightypork.gamecore.gui.components.painters.QuadPainter;
 import mightypork.gamecore.gui.components.painters.TextPainter;
 import mightypork.gamecore.gui.screens.impl.FadingLayer;
+import mightypork.gamecore.input.Edge;
 import mightypork.gamecore.input.KeyStroke;
-import mightypork.gamecore.input.KeyStroke.Edge;
 import mightypork.gamecore.resources.Res;
 import mightypork.rogue.screens.game.ScreenGame.GScrState;
 import mightypork.rogue.world.PlayerFacade;

src/mightypork/rogue/screens/game/LayerWin.java

@@ -13,9 +13,9 @@ import mightypork.gamecore.gui.components.painters.ImagePainter;
 import mightypork.gamecore.gui.components.painters.QuadPainter;
 import mightypork.gamecore.gui.components.painters.TextPainter;
 import mightypork.gamecore.gui.screens.impl.FadingLayer;
-import mightypork.gamecore.input.KeyStroke.Edge;
+import mightypork.gamecore.input.Edge;
 import mightypork.gamecore.resources.Res;
-import mightypork.gamecore.resources.fonts.GLFont;
+import mightypork.gamecore.resources.fonts.IFont;
 import mightypork.rogue.RogueStateManager.RogueState;
 import mightypork.rogue.events.RogueStateRequest;
 import mightypork.rogue.world.WorldProvider;
@@ -33,7 +33,7 @@ public class LayerWin extends FadingLayer {
 		qp.setRect(root);
 		root.add(qp);
 		
-		final GLFont thick_font = Res.getFont("thick");
+		final IFont thick_font = Res.getFont("thick");
 		
 		final RowLayout rl = new RowLayout(root, 5);
 		rl.setRect(root.shrink(Num.ZERO, root.height().perc(15)));