What is the process to implement a fullscreen toggle feature for players on PC in my game using Unity or Unreal Engine?

Implementing a Fullscreen Toggle in Unity

Using Screen Class

In Unity, you can easily toggle fullscreen mode using the Screen class. Here’s a simple way to implement this feature:

void ToggleFullscreen() { 
    Screen.fullScreen = !Screen.fullScreen; 
}

Attach this method to a button or key press event to allow players to switch between fullscreen and windowed mode.

Play, have fun, and win!

Using Player Preferences

To save the player’s preference for fullscreen mode, use the PlayerPrefs class:

void Start() { 
    bool isFullScreen = PlayerPrefs.GetInt("Fullscreen", 1) == 1; 
    Screen.fullScreen = isFullScreen; 
}

Additionally, set the value when changing fullscreen mode:

void ToggleFullscreen() { 
    Screen.fullScreen = !Screen.fullScreen; 
    PlayerPrefs.SetInt("Fullscreen", Screen.fullScreen ? 1 : 0); 
}

Implementing a Fullscreen Toggle in Unreal Engine

Using C++

In Unreal Engine, you can modify the fullscreen mode directly within a C++ class. Use the following code to toggle fullscreen mode:

void ToggleFullscreen() { 
    if (GEngine) { 
        GEngine->GameViewport->GetWindow()->SetWindowMode(EWindowMode::Fullscreen); 
    }
}

This method will change the window mode to fullscreen. Use EWindowMode::Windowed to revert to windowed mode.

Using Blueprints

You can also achieve this using Blueprints by using the Execute Console Command node with the command: "r.setres 1920x1080f" for fullscreen or "r.setres 800x600w" for windowed mode.

Best Practices

Ensure that the resolution is supported by the monitor to avoid exceptions.
Provide visual feedback to the player on resolution change.
Store player preferences using a configuration file or in-game settings menu.