Error “validate_display:255 error 3008 (EGL_BAD_DISPLAY)” by Toutorial

Understanding the “validate_display:255 error 3008 (EGL_BAD_DISPLAY)” Error

This error message, often encountered in applications that utilize OpenGL ES, signifies a problem with the EGL display setup. Let’s break down the key aspects.

What is EGL?

EGL (Embedded Graphics Library) acts as an intermediary between your application and the underlying graphics hardware. It enables your application to access and utilize the graphics rendering capabilities of the device.

What does “EGL_BAD_DISPLAY” mean?

The “EGL_BAD_DISPLAY” error points to an issue where the EGL library has detected an invalid or non-existent display. This usually happens because:

• Incorrect Display Setup: Your application might be attempting to connect to a display that isn’t available or properly configured.
• Driver Problems: The graphics driver associated with your hardware might be outdated, corrupted, or incompatible with the EGL library.
• Hardware Malfunctions: In rare cases, faulty hardware components could also lead to this error.

Troubleshooting the Error

Step 1: Verify Display Availability

Ensure that the display you’re targeting in your application is actually active and accessible. This might involve checking:

• Connected Display Devices: Make sure your monitor or other output device is properly connected to the system.
• Display Server: If you’re using a remote display, verify that the display server is running and accepting connections.
• Display Configuration: Check the system’s display settings to confirm the correct display resolution and other parameters are configured.

Step 2: Update Graphics Drivers

Out-of-date or corrupted graphics drivers can cause conflicts with EGL. Download the latest drivers from the manufacturer’s website and install them.

Step 3: Reinstall OpenGL ES Library

Sometimes, a reinstallation of the OpenGL ES library can resolve issues related to EGL. The specific steps will vary based on your system and operating system.

Step 4: Check Hardware

As a last resort, if all other troubleshooting steps fail, it’s advisable to inspect your hardware for potential malfunctions. This could involve checking the integrity of your graphics card and its connections.

Code Example and Output

Here’s a simple example demonstrating how an incorrect display setup can lead to the “EGL_BAD_DISPLAY” error:

#include <EGL/egl.h>
#include <EGL/eglplatform.h>

int main() {
    EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY); // Incorrect display

    if (display == EGL_NO_DISPLAY) {
        // Error handling
        printf("Error: Failed to get EGL display.\n");
        return 1;
    }

    // ... Rest of your EGL initialization code
}

Error: Failed to get EGL display.

Summary

The “validate_display:255 error 3008 (EGL_BAD_DISPLAY)” error arises from inconsistencies in your EGL setup. By meticulously checking the display availability, updating graphics drivers, and potentially reinstalling the OpenGL ES library, you can effectively troubleshoot and resolve this error.