Implemented dynamic main menu backgrounds.

- This can be switched off in the configuration file.
- Credits: https://osu.ppy.sh/forum/t/98954

Other changes:
- Removed OsuFile setters/getters from Game state, replaced with a 'getOsuFile()' method in MusicController (a more logical location).

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/GameScore.java

@@ -18,7 +18,6 @@
 
 package itdelatrisu.opsu;
 
-import itdelatrisu.opsu.states.Game;
 import itdelatrisu.opsu.states.Options;
 
 import java.util.HashMap;
@@ -449,7 +448,7 @@ public class GameScore {
 		float circleDiameter = getScoreSymbolImage('0').getHeight() * 0.75f;
 		g.drawOval(circleX, circleY, circleDiameter, circleDiameter);
 
-		int firstObjectTime = Game.getOsuFile().objects[0].time;
+		int firstObjectTime = MusicController.getOsuFile().objects[0].time;
 		int trackPosition = MusicController.getPosition();
 		if (trackPosition > firstObjectTime) {
 			g.fillArc(circleX, circleY, circleDiameter, circleDiameter,

src/itdelatrisu/opsu/MusicController.java

@@ -162,6 +162,11 @@ public class MusicController {
 		return (player != null);
 	}
 
+	/**
+	 * Returns the OsuFile associated with the current track.
+	 */
+	public static OsuFile getOsuFile() { return lastOsu; }
+
 	/**
 	 * Returns the name of the current track.
 	 */

src/itdelatrisu/opsu/Opsu.java

@@ -165,7 +165,7 @@ public class Opsu extends StateBasedGame {
 		if (id == STATE_GAME || id == STATE_GAMEPAUSEMENU || id == STATE_GAMERANKING) {
 			// start playing track at preview position
 			MusicController.pause();
-			MusicController.playAt(Game.getOsuFile().previewTime, true);
+			MusicController.playAt(MusicController.getOsuFile().previewTime, true);
 			this.enterState(Opsu.STATE_SONGMENU, new FadeOutTransition(Color.black), new FadeInTransition(Color.black));
 			return false;
 		}

src/itdelatrisu/opsu/states/Game.java

@@ -649,6 +649,9 @@ public class Game extends BasicGameState {
 	@Override
 	public void enter(GameContainer container, StateBasedGame game)
 			throws SlickException {
+		if (restart == RESTART_NEW)
+			osu = MusicController.getOsuFile();
+
 		if (osu == null || osu.objects == null)
 			throw new RuntimeException("Running game with no OsuFile loaded.");
 
@@ -810,12 +813,6 @@ public class Game extends BasicGameState {
 	public static void setRestart(byte restart) { Game.restart = restart; }
 	public static byte getRestart() { return Game.restart; }
 
-	/**
-	 * Sets or returns the associated OsuFile.
-	 */
-	public static void setOsuFile(OsuFile osu) { Game.osu = osu; }
-	public static OsuFile getOsuFile() { return osu; }
-
 	/**
 	 * Returns the associated GameScore object.
 	 */

src/itdelatrisu/opsu/states/GamePauseMenu.java

@@ -144,7 +144,7 @@ public class GamePauseMenu extends BasicGameState {
 			// 'esc' will normally unpause, but will return to song menu if health is zero
 			if (Game.getRestart() == Game.RESTART_LOSE) {
 				MusicController.stop();
-				MusicController.playAt(Game.getOsuFile().previewTime, true);
+				MusicController.playAt(MusicController.getOsuFile().previewTime, true);
 				SoundController.playSound(SoundController.SOUND_MENUBACK);
 				game.enterState(Opsu.STATE_SONGMENU, new FadeOutTransition(Color.black), new FadeInTransition(Color.black));
 			} else
@@ -174,7 +174,7 @@ public class GamePauseMenu extends BasicGameState {
 			unPause(Game.RESTART_MANUAL);
 		} else if (backButton.contains(x, y)) {
 			MusicController.pause();  // lose state
-			MusicController.playAt(Game.getOsuFile().previewTime, true);
+			MusicController.playAt(MusicController.getOsuFile().previewTime, true);
 			SoundController.playSound(SoundController.SOUND_MENUBACK);
 			game.enterState(Opsu.STATE_SONGMENU, new FadeOutTransition(Color.black), new FadeInTransition(Color.black));
 		}

src/itdelatrisu/opsu/states/GameRanking.java

@@ -97,7 +97,7 @@ public class GameRanking extends BasicGameState {
 		int width = container.getWidth();
 		int height = container.getHeight();
 
-		OsuFile osu = Game.getOsuFile();
+		OsuFile osu = MusicController.getOsuFile();
 
 		// background
 		if (!osu.drawBG(width, height, 0.7f))
@@ -147,7 +147,7 @@ public class GameRanking extends BasicGameState {
 		switch (key) {
 		case Input.KEY_ESCAPE:
 			MusicController.pause();
-			MusicController.playAt(Game.getOsuFile().previewTime, true);
+			MusicController.playAt(MusicController.getOsuFile().previewTime, true);
 			SoundController.playSound(SoundController.SOUND_MENUBACK);
 			game.enterState(Opsu.STATE_SONGMENU, new FadeOutTransition(Color.black), new FadeInTransition(Color.black));
 			break;
@@ -164,7 +164,7 @@ public class GameRanking extends BasicGameState {
 			return;
 
 		if (retryButton.contains(x, y)) {
-			OsuFile osu = Game.getOsuFile();
+			OsuFile osu = MusicController.getOsuFile();
 			Display.setTitle(String.format("%s - %s", game.getTitle(), osu.toString()));
 			Game.setRestart(Game.RESTART_MANUAL);
 			SoundController.playSound(SoundController.SOUND_MENUHIT);
@@ -174,7 +174,7 @@ public class GameRanking extends BasicGameState {
 			game.enterState(Opsu.STATE_MAINMENU, new FadeOutTransition(Color.black), new FadeInTransition(Color.black));
 		} else if (Utils.getBackButton().contains(x, y)) {
 			MusicController.pause();
-			MusicController.playAt(Game.getOsuFile().previewTime, true);
+			MusicController.playAt(MusicController.getOsuFile().previewTime, true);
 			SoundController.playSound(SoundController.SOUND_MENUBACK);
 			game.enterState(Opsu.STATE_SONGMENU, new FadeOutTransition(Color.black), new FadeInTransition(Color.black));
 		}

src/itdelatrisu/opsu/states/MainMenu.java

@@ -21,6 +21,7 @@ package itdelatrisu.opsu.states;
 import itdelatrisu.opsu.GUIMenuButton;
 import itdelatrisu.opsu.MusicController;
 import itdelatrisu.opsu.Opsu;
+import itdelatrisu.opsu.OsuFile;
 import itdelatrisu.opsu.OsuGroupNode;
 import itdelatrisu.opsu.SoundController;
 import itdelatrisu.opsu.Utils;
@@ -94,6 +95,11 @@ public class MainMenu extends BasicGameState {
 	 */
 	private Image backgroundImage;
 
+	/**
+	 * Alpha level for fade-in effect for dynamic backgrounds.
+	 */
+	private float dynamicBackgroundAlpha = 0f;
+
 	// game-related variables
 	private StateBasedGame game;
 	private int state;
@@ -151,14 +157,18 @@ public class MainMenu extends BasicGameState {
 	@Override
 	public void render(GameContainer container, StateBasedGame game, Graphics g)
 			throws SlickException {
-		if (backgroundImage != null)
+		int width = container.getWidth();
+		int height = container.getHeight();
+		
+		// draw background
+		OsuFile osu = MusicController.getOsuFile();
+		if (Options.isDynamicBackgroundEnabled() &&
+			osu != null && osu.drawBG(width, height, dynamicBackgroundAlpha))
+				;
+		else if (backgroundImage != null)
 			backgroundImage.draw();
 		else
 			g.setBackground(Utils.COLOR_BLUE_BACKGROUND);
-		g.setFont(Utils.FONT_MEDIUM);
-
-		int width = container.getWidth();
-		int height = container.getHeight();
 
 		// draw buttons
 		if (logoTimer > 0) {
@@ -182,6 +192,7 @@ public class MainMenu extends BasicGameState {
 				148f * MusicController.getPosition() / MusicController.getTrackLength(), 5, 4);
 
 		// draw text
+		g.setFont(Utils.FONT_MEDIUM);
 		int lineHeight = Utils.FONT_MEDIUM.getLineHeight();
 		g.drawString(String.format("Loaded %d songs and %d beatmaps.",
 				Opsu.groups.size(), Opsu.groups.getMapCount()), 25, 25);
@@ -211,6 +222,14 @@ public class MainMenu extends BasicGameState {
 	@Override
 	public void update(GameContainer container, StateBasedGame game, int delta)
 			throws SlickException {
+		// dynamic backgrounds
+		if (Options.isDynamicBackgroundEnabled() && dynamicBackgroundAlpha < 0.9f) {
+			dynamicBackgroundAlpha += delta / 1000f;
+			if (dynamicBackgroundAlpha > 0.9f)
+				dynamicBackgroundAlpha = 0.9f;
+		}
+
+		// buttons
 		if (logoClicked) {
 			if (logoTimer == 0) {  // shifting to left
 				if (logo.getX() > container.getWidth() / 3.3f)
@@ -275,10 +294,12 @@ public class MainMenu extends BasicGameState {
 			OsuGroupNode node = menu.setFocus(Opsu.groups.getRandomNode(), -1, true);
 			if (node != null)
 				previous.add(node.index);
+			dynamicBackgroundAlpha = 0f;
 		} else if (musicPrevious.contains(x, y)) {
 			if (!previous.isEmpty()) {
 				SongMenu menu = (SongMenu) game.getState(Opsu.STATE_SONGMENU);
 				menu.setFocus(Opsu.groups.getBaseNode(previous.pop()), -1, true);
+				dynamicBackgroundAlpha = 0f;
 			} else
 				MusicController.setPosition(0);
 		}

src/itdelatrisu/opsu/states/Options.java

@@ -209,6 +209,11 @@ public class Options extends BasicGameState {
 	 */
 	private static boolean newCursor = true;
 
+	/**
+	 * Whether or not dynamic backgrounds are enabled.
+	 */
+	private static boolean dynamicBackground = true;
+
 	/**
 	 * Game option coordinate modifiers (for drawing).
 	 */
@@ -612,6 +617,12 @@ public class Options extends BasicGameState {
 	 */
 	public static boolean isNewCursorEnabled() { return newCursor; }
 
+	/**
+	 * Returns whether or not the main menu background should be the current track image.
+	 * @return true if enabled
+	 */
+	public static boolean isDynamicBackgroundEnabled() { return dynamicBackground; }
+
 	/**
 	 * Returns the current beatmap directory.
 	 * If invalid, this will attempt to search for the directory,
@@ -718,14 +729,19 @@ public class Options extends BasicGameState {
 				case "ComboBurst":
 					showComboBursts = Boolean.parseBoolean(value);
 					break;
+
+				// custom entries
 				case "Port":
 					i = Integer.parseInt(value);
 					if (i > 0 && i <= 65535)
 						port = i;
 					break;
-				case "NewCursor":  // custom
+				case "NewCursor":
 					newCursor = Boolean.parseBoolean(value);
 					break;
+				case "DynamicBackground":
+					dynamicBackground = Boolean.parseBoolean(value);
+					break;
 				}
 			}
 		} catch (IOException e) {
@@ -777,9 +793,13 @@ public class Options extends BasicGameState {
 			writer.newLine();
 			writer.write(String.format("ComboBurst = %b", showComboBursts));
 			writer.newLine();
+
+			// custom entries
 			writer.write(String.format("Port = %d", port));
 			writer.newLine();
-			writer.write(String.format("NewCursor = %b", newCursor));  // custom
+			writer.write(String.format("NewCursor = %b", newCursor));
+			writer.newLine();
+			writer.write(String.format("DynamicBackground = %b", dynamicBackground));
 			writer.newLine();
 			writer.close();
 		} catch (IOException e) {

src/itdelatrisu/opsu/states/SongMenu.java

@@ -602,7 +602,6 @@ public class SongMenu extends BasicGameState {
 		Display.setTitle(String.format("%s - %s", game.getTitle(), osu.toString()));
 		OsuParser.parseHitObjects(osu);
 		SoundController.setSampleSet(osu.sampleSet);
-		Game.setOsuFile(osu);
 		Game.setRestart(Game.RESTART_NEW);
 		game.enterState(Opsu.STATE_GAME, new FadeOutTransition(Color.black), new FadeInTransition(Color.black));
 	}