Created a splash screen state for loading resources.

- Game now boots to splash screen, which displays parser progress.
- Added option "LoadVerbose" to disable rendering the progress text.
- Main Menu backgrounds now fade in regardless of DynamicBackground setting (as a transition from the splash screen).

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

src/itdelatrisu/opsu/states/Splash.java

@@ -0,0 +1,125 @@
+/*
+ * opsu! - an open-source osu! client
+ * Copyright (C) 2014 Jeffrey Han
+ *
+ * opsu! is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * opsu! is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with opsu!.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package itdelatrisu.opsu.states;
+
+import itdelatrisu.opsu.Opsu;
+import itdelatrisu.opsu.OsuGroupList;
+import itdelatrisu.opsu.OsuParser;
+import itdelatrisu.opsu.SoundController;
+import itdelatrisu.opsu.Utils;
+
+import org.newdawn.slick.Color;
+import org.newdawn.slick.GameContainer;
+import org.newdawn.slick.Graphics;
+import org.newdawn.slick.Image;
+import org.newdawn.slick.SlickException;
+import org.newdawn.slick.state.BasicGameState;
+import org.newdawn.slick.state.StateBasedGame;
+
+public class Splash extends BasicGameState {
+	/**
+	 * Logo image.
+	 */
+	private Image logo;
+
+	/**
+	 * Whether or not loading has completed.
+	 */
+	private boolean finished = false;
+
+	// game-related variables
+	private int state;
+
+	public Splash(int state) {
+		this.state = state;
+	}
+
+	@Override
+	public void init(GameContainer container, StateBasedGame game)
+			throws SlickException {
+		final int width = container.getWidth();
+		final int height = container.getHeight();
+
+		logo = new Image("logo.png");
+		logo = logo.getScaledCopy((height / 1.2f) / logo.getHeight());
+		logo.setAlpha(0f);
+
+		// load Utils class first (needed in other 'init' methods)
+		Utils.init(container, game);
+
+		// load other resources in a new thread
+		final SongMenu menu = (SongMenu) game.getState(Opsu.STATE_SONGMENU);
+		new Thread() {
+			@Override
+			public void run() {
+				// parse song directory
+				OsuParser.parseAllFiles(Options.getBeatmapDir(), width, height);
+
+				// initialize song list
+				Opsu.groups.init(OsuGroupList.SORT_TITLE);
+				menu.setFocus(Opsu.groups.getRandomNode(), -1, true);
+
+				// load sounds
+				SoundController.init();
+
+				finished = true;
+			}
+		}.start();
+	}
+
+	@Override
+	public void render(GameContainer container, StateBasedGame game, Graphics g)
+			throws SlickException {
+		g.setBackground(Color.black);
+
+		int width = container.getWidth();
+		int height = container.getHeight();
+
+		logo.drawCentered(width / 2, height / 2);
+
+		// progress tracking
+		String currentFile = OsuParser.getCurrentFileName();
+		if (currentFile != null && Options.isLoadVerbose()) {
+			g.setColor(Color.white);
+			g.setFont(Utils.FONT_MEDIUM);
+			int lineHeight = Utils.FONT_MEDIUM.getLineHeight();
+			g.drawString(
+					String.format("Loading... (%s%%)", OsuParser.getParserProgress()),
+					25, height - 25 - (lineHeight * 2)
+			);
+			g.drawString(currentFile, 25, height - 25 - lineHeight);
+		}
+	}
+
+	@Override
+	public void update(GameContainer container, StateBasedGame game, int delta)
+			throws SlickException {
+		// fade in logo
+		float alpha = logo.getAlpha();
+		if (alpha < 1f)
+			logo.setAlpha(alpha + (delta / 400f));
+
+		// change states when loading complete
+		if (finished && alpha >= 1f)
+			game.enterState(Opsu.STATE_MAINMENU);
+	}
+
+	@Override
+	public int getID() { return state; }
+}