适配LWJGL3时glfwGetPrimaryMonitor()空指针异常，无法检测显示器

Hey there, sorry to hear you're stuck with this display detection hiccup while porting your ThinMatrix LWJGL 2 game over to LWJGL 3! Let’s walk through some targeted checks and fixes to get you back on track:

First: Double-Check Your LWJGL 3 Display Code #

LWJGL 3 completely replaced the old Display system with GLFW, so even small oversights in your port can break monitor detection. Here are key things to verify:

• Ensure GLFW is initialized first: You must call glfwInit() before trying to detect monitors. If this fails, it’s a red flag for library or driver issues.
• Use GLFW’s monitor enumeration methods: Ditch LWJGL 2’s Display.getDisplayMode() and use GLFW’s proper APIs. Example snippet to test detection:

  // Initialize GLFW first
  if (!glfwInit()) {
      throw new IllegalStateException("Failed to initialize GLFW - check your LWJGL setup!");
  }
  
  // Fetch all connected monitors
  long[] monitors = glfwGetMonitors();
  if (monitors == null || monitors.length == 0) {
      throw new RuntimeException("No monitors detected by GLFW!");
  }
  
  // Print monitor info for debugging
  for (long monitor : monitors) {
      System.out.println("Detected monitor: " + glfwGetMonitorName(monitor));
      GLFWVidMode mode = glfwGetVideoMode(monitor);
      System.out.println("Resolution: " + mode.width() + "x" + mode.height());
  }
  

• Avoid leftover LWJGL 2 code: If your displayManage class still references old Display methods (like Display.create()), that’s almost certainly causing conflicts. Replace all display-related logic with GLFW equivalents.

System & Driver Troubleshooting (Beyond Basic Reinstalls) #

Since it worked on the same hardware before, let’s dig deeper into system-level fixes:

• Clean install your GPU drivers: Use a tool like Display Driver Uninstaller (DDU) to fully wipe existing drivers, then install the latest stable version from your GPU manufacturer’s site. Partial uninstalls can leave corrupt files that break GLFW’s detection.
• Verify Windows display settings: Check if any monitors are disabled in Settings > System > Display. Even if your OS shows them, a disabled monitor might not be picked up by GLFW.
• Test with LWJGL 3’s official examples: Grab the LWJGL 3 Monitor or HelloWorld sample and run it. If these also fail to detect monitors, the issue is likely with your system/drivers, not your game code. If they work, your port has a bug to fix.

Debug LWJGL 3’s Internal Behavior #

Enable LWJGL’s debug logging to catch hidden errors:

• Add the JVM argument -Dorg.lwjgl.system.Debug=true when running your game. This will print detailed logs about library loading, GLFW initialization, and any driver-related failures that might be silent otherwise.

Check Your LWJGL 3 Dependencies #

Make sure your build setup includes all required LWJGL 3 modules:

• You need at least glfw, opengl, and the native libraries matching your OS/architecture. Missing or mismatched natives can prevent GLFW from communicating with your display hardware.

内容的提问来源于stack exchange，提问作者takochako