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lwjgl3/src/src/main/java/me/lethunderhawk/lwjgl3/Lwjgl3Launcher.java

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+package me.lethunderhawk.lwjgl3;
+
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
+import me.lethunderhawk.Main;
+
+/** Launches the desktop (LWJGL3) application. */
+public class Lwjgl3Launcher {
+    public static void main(String[] args) {
+        if (StartupHelper.startNewJvmIfRequired()) return; // This handles macOS support and helps on Windows.
+        createApplication();
+    }
+
+    private static Lwjgl3Application createApplication() {
+        return new Lwjgl3Application(new Main(), getDefaultConfiguration());
+    }
+
+    private static Lwjgl3ApplicationConfiguration getDefaultConfiguration() {
+        Lwjgl3ApplicationConfiguration configuration = new Lwjgl3ApplicationConfiguration();
+        configuration.setTitle("Smog");
+        //// Vsync limits the frames per second to what your hardware can display, and helps eliminate
+        //// screen tearing. This setting doesn't always work on Linux, so the line after is a safeguard.
+        configuration.useVsync(true);
+        //// Limits FPS to the refresh rate of the currently active monitor, plus 1 to try to match fractional
+        //// refresh rates. The Vsync setting above should limit the actual FPS to match the monitor.
+        configuration.setForegroundFPS(Lwjgl3ApplicationConfiguration.getDisplayMode().refreshRate + 1);
+        //// If you remove the above line and set Vsync to false, you can get unlimited FPS, which can be
+        //// useful for testing performance, but can also be very stressful to some hardware.
+        //// You may also need to configure GPU drivers to fully disable Vsync; this can cause screen tearing.
+
+        configuration.setWindowedMode(640, 480);
+        //// You can change these files; they are in lwjgl3/src/main/resources/ .
+        //// They can also be loaded from the root of assets/ .
+        configuration.setWindowIcon("libgdx128.png", "libgdx64.png", "libgdx32.png", "libgdx16.png");
+
+        //// This could improve compatibility with Windows machines with buggy OpenGL drivers, Macs
+        //// with Apple Silicon that have to emulate compatibility with OpenGL anyway, and more.
+        //// This uses the dependency `com.badlogicgames.gdx:gdx-lwjgl3-angle` to function.
+        //// You would need to add this line to lwjgl3/build.gradle , below the dependency on `gdx-backend-lwjgl3`:
+        ////     implementation "com.badlogicgames.gdx:gdx-lwjgl3-angle:$gdxVersion"
+        //// You can choose to add the following line and the mentioned dependency if you want; they
+        //// are not intended for games that use GL30 (which is compatibility with OpenGL ES 3.0).
+        //// Know that it might not work well in some cases.
+//        configuration.setOpenGLEmulation(Lwjgl3ApplicationConfiguration.GLEmulation.ANGLE_GLES20, 0, 0);
+
+        return configuration;
+    }
+}

lwjgl3/src/src/main/java/me/lethunderhawk/lwjgl3/StartupHelper.java

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+/*
+ * Copyright 2020 damios
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Note, the above license and copyright applies to this file only.
+package me.lethunderhawk.lwjgl3;
+
+import com.badlogic.gdx.Version;
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3NativesLoader;
+
+import org.lwjgl.system.JNI;
+import org.lwjgl.system.linux.UNISTD;
+import org.lwjgl.system.macosx.LibC;
+import org.lwjgl.system.macosx.ObjCRuntime;
+
+import java.io.File;
+import java.lang.management.ManagementFactory;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * A helper object for game startup, featuring three utilities related to LWJGL3 on various operating systems.
+ * <p>
+ * The utilities are as follows:
+ * <ul>
+ *  <li> Windows: Prevents a common crash related to LWJGL3's extraction of shared library files.</li>
+ *  <li> macOS: Spawns a child JVM process with {@code -XstartOnFirstThread} in the JVM args (if it was not already).
+ *  This is required for LWJGL3 to work on macOS.</li>
+ *  <li> Linux (NVIDIA GPUs only): Spawns a child JVM process with the {@code __GL_THREADED_OPTIMIZATIONS}
+ *  {@link System#getenv(String) Environment Variable} set to {@code 0} (if it was not already). This is required for
+ *  LWJGL3 to work on Linux with NVIDIA GPUs.</li>
+ * </ul>
+ * <a href="https://jvm-gaming.org/t/starting-jvm-on-mac-with-xstartonfirstthread-programmatically/57547">Based on this java-gaming.org post by kappa</a>
+ * @author damios
+ */
+public class StartupHelper {
+
+	private StartupHelper() {}
+
+	private static final String JVM_RESTARTED_ARG = "jvmIsRestarted";
+
+	/**
+	 * Must only be called on Linux. Check OS first (or use short-circuit evaluation)!
+	 * @return whether NVIDIA drivers are present on Linux.
+	 */
+	public static boolean isLinuxNvidia() {
+		String[] drivers = new File("/proc/driver").list(
+			(dir, path) -> path.toUpperCase(Locale.ROOT).contains("NVIDIA")
+		);
+		if (drivers == null) return false;
+		return drivers.length > 0;
+	}
+
+	/**
+	 * Applies the utilities as described by {@link StartupHelper}'s Javadoc.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * <p>
+	 * <b>Usage:</b>
+	 * <pre><code>
+	 * public static void main(String[] args) {
+	 * 	 if (StartupHelper.startNewJvmIfRequired()) return;
+	 * 	 // ... The rest of main() goes here, as normal.
+	 * }
+	 * </code></pre>
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvmIfRequired() {
+		return startNewJvmIfRequired(true);
+	}
+
+	/**
+	 * Applies the utilities as described by {@link StartupHelper}'s Javadoc.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * <p>
+	 * <b>Usage:</b>
+	 * <pre><code>
+	 * public static void main(String[] args) {
+	 *   // The parameter on the next line could instead be false if you don't want to inherit IO.
+	 * 	 if (StartupHelper.startNewJvmIfRequired(true)) return;
+	 * 	 // ... The rest of main() goes here, as normal.
+	 * }
+	 * </code></pre>
+	 * @param inheritIO whether I/O should be inherited in the child JVM process. Please note that enabling this will
+	 *                  block the thread until the child JVM process stops executing.
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvmIfRequired(boolean inheritIO) {
+		String osName = System.getProperty("os.name").toLowerCase(Locale.ROOT);
+		if (osName.contains("mac")) return startNewJvm0(/*isMac =*/ true, inheritIO);
+		if (osName.contains("windows")) {
+			// Here, we are trying to work around an issue with how LWJGL3 loads its extracted .dll files.
+			// By default, LWJGL3 extracts to the directory specified by "java.io.tmpdir": usually, the user's home.
+			// If the user's name has non-ASCII (or some non-alphanumeric) characters in it, that would fail.
+			// By extracting to the relevant "ProgramData" folder, which is usually "C:\ProgramData", we avoid this.
+			// We also temporarily change the "user.name" property to one without any chars that would be invalid.
+			// We revert our changes immediately after loading LWJGL3 natives.
+			String programData = System.getenv("ProgramData");
+			if (programData == null) programData = "C:\\Temp"; // if ProgramData isn't set, try some fallback.
+			String prevTmpDir = System.getProperty("java.io.tmpdir", programData);
+			String prevUser = System.getProperty("user.name", "libGDX_User");
+			System.setProperty("java.io.tmpdir", programData + "\\libGDX-temp");
+			System.setProperty(
+				"user.name",
+				("User_" + prevUser.hashCode() + "_GDX" + Version.VERSION).replace('.', '_')
+			);
+			Lwjgl3NativesLoader.load();
+			System.setProperty("java.io.tmpdir", prevTmpDir);
+			System.setProperty("user.name", prevUser);
+			return false;
+		}
+		return startNewJvm0(/*isMac =*/ false, inheritIO);
+	}
+
+	private static final String MAC_JRE_ERR_MSG = "A Java installation could not be found. If you are distributing this app with a bundled JRE, be sure to set the '-XstartOnFirstThread' argument manually!";
+	private static final String LINUX_JRE_ERR_MSG = "A Java installation could not be found. If you are distributing this app with a bundled JRE, be sure to set the environment variable '__GL_THREADED_OPTIMIZATIONS' to '0'!";
+	private static final String CHILD_LOOP_ERR_MSG = "The current JVM process is a spawned child JVM process, but StartupHelper has attempted to spawn another child JVM process! This is a broken state, and should not normally happen! Your game may crash or not function properly!";
+
+	/**
+	 * Spawns a child JVM process if on macOS, or on Linux with NVIDIA drivers.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * @param isMac whether the current OS is macOS. If this is `false` then the current OS is assumed to be Linux (and
+	 *             an immediate check for NVIDIA drivers is performed).
+	 * @param inheritIO whether I/O should be inherited in the child JVM process. Please note that enabling this will
+	 *                 block the thread until the child JVM process stops executing.
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvm0(boolean isMac, boolean inheritIO) {
+		long processID = getProcessID(isMac);
+		if (!isMac) {
+			// No need to restart non-NVIDIA Linux
+			if (!isLinuxNvidia()) return false;
+			// check whether __GL_THREADED_OPTIMIZATIONS is already disabled
+			if ("0".equals(System.getenv("__GL_THREADED_OPTIMIZATIONS"))) return false;
+		} else {
+			// There is no need for -XstartOnFirstThread on Graal native image
+			if (!System.getProperty("org.graalvm.nativeimage.imagecode", "").isEmpty()) return false;
+
+			// Checks if we are already on the main thread, such as from running via Construo.
+			long objcMsgSend = ObjCRuntime.getLibrary().getFunctionAddress("objc_msgSend");
+			long nsThread = ObjCRuntime.objc_getClass("NSThread");
+			long currentThread = JNI.invokePPP(nsThread, ObjCRuntime.sel_getUid("currentThread"), objcMsgSend);
+			boolean isMainThread = JNI.invokePPZ(currentThread, ObjCRuntime.sel_getUid("isMainThread"), objcMsgSend);
+			if (isMainThread) return false;
+
+			if ("1".equals(System.getenv("JAVA_STARTED_ON_FIRST_THREAD_" + processID))) return false;
+		}
+
+		// Check whether this JVM process is a child JVM process already.
+		// This state shouldn't usually be reachable, but this stops us from endlessly spawning new child JVM processes.
+		if ("true".equals(System.getProperty(JVM_RESTARTED_ARG))) {
+			System.err.println(CHILD_LOOP_ERR_MSG);
+			return false;
+		}
+
+		// Spawn the child JVM process with updated environment variables or JVM args
+		List<String> jvmArgs = new ArrayList<>();
+		// The following line is used assuming you target Java 8, the minimum for LWJGL3.
+		String javaExecPath = System.getProperty("java.home") + "/bin/java";
+		// If targeting Java 9 or higher, you could use the following instead of the above line:
+		//String javaExecPath = ProcessHandle.current().info().command().orElseThrow()
+		if (!(new File(javaExecPath).exists())) {
+			System.err.println(getJreErrMsg(isMac));
+			return false;
+		}
+
+		jvmArgs.add(javaExecPath);
+		if (isMac) jvmArgs.add("-XstartOnFirstThread");
+		jvmArgs.add("-D" + JVM_RESTARTED_ARG + "=true");
+		jvmArgs.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments());
+		jvmArgs.add("-cp");
+		jvmArgs.add(System.getProperty("java.class.path"));
+		String mainClass = System.getenv("JAVA_MAIN_CLASS_" + processID);
+		if (mainClass == null) {
+			StackTraceElement[] trace = Thread.currentThread().getStackTrace();
+			if (trace.length > 0) mainClass = trace[trace.length - 1].getClassName();
+			else {
+				System.err.println("The main class could not be determined.");
+				return false;
+			}
+		}
+		jvmArgs.add(mainClass);
+
+		try {
+			ProcessBuilder processBuilder = new ProcessBuilder(jvmArgs);
+			if (!isMac) processBuilder.environment().put("__GL_THREADED_OPTIMIZATIONS", "0");
+
+			if (!inheritIO) processBuilder.start();
+			else processBuilder.inheritIO().start().waitFor();
+		} catch (Exception e) {
+			System.err.println("There was a problem restarting the JVM.");
+			// noinspection CallToPrintStackTrace
+			e.printStackTrace();
+		}
+
+		return true;
+	}
+
+	private static String getJreErrMsg(boolean isMac) {
+		if (isMac) return MAC_JRE_ERR_MSG;
+		else return LINUX_JRE_ERR_MSG;
+	}
+
+	private static long getProcessID(boolean isMac) {
+		if (isMac) return LibC.getpid();
+		else return UNISTD.getpid();
+	}
+}