getting rid of the slick (App)GameContainer

src/yugecin/opsudance/utils/GLHelper.java

@@ -0,0 +1,53 @@
+/*
+ * opsu!dance - fork of opsu! with cursordance auto
+ * Copyright (C) 2017 yugecin
+ *
+ * opsu!dance 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!dance 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!dance.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package yugecin.opsudance.utils;
+
+import org.lwjgl.LWJGLException;
+import org.lwjgl.opengl.Display;
+import org.lwjgl.opengl.DisplayMode;
+
+public class GLHelper {
+
+	/**
+	 * from org.newdawn.slick.AppGameContainer#setDisplayMode
+	 */
+	public static DisplayMode findFullscreenDisplayMode(int targetBPP, int targetFrequency, int width, int height) throws LWJGLException {
+		DisplayMode[] modes = Display.getAvailableDisplayModes();
+		DisplayMode foundMode = null;
+		int freq = 0;
+		int bpp = 0;
+
+		for (DisplayMode current : modes) {
+			if (current.getWidth() != width || current.getHeight() != height) {
+				continue;
+			}
+
+			if (current.getBitsPerPixel() == targetBPP && current.getFrequency() == targetFrequency) {
+				return current;
+			}
+
+			if (current.getFrequency() >= freq && (foundMode == null || current.getBitsPerPixel() >= bpp)) {
+				foundMode = current;
+				freq = foundMode.getFrequency();
+				bpp = foundMode.getBitsPerPixel();
+			}
+		}
+		return foundMode;
+	}
+
+}