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Set up the Scene

Drag the MadderManager and MadderControllerManager prefabs from Packages > Madder Starter Pack > Runtime > Prefabs into your scene. These prefabs are Singleton classes and will persist across scene loads. These are the core components of the Madder system and are required for Madder to work with your game.
If you do not see the Madder Starter Pack folder or any other packages, they may be hidden. Click the visibility button to toggle them on.
toggle hidden package visibility Additionally, drop the SampleGameManager, SamplePlayerManager, and MadderControllerTest prefabs into your scene. These prefabs are examples of how you might interact with the Madder system. Here’s an example of what your scene hierarchy might look like: Sample Scene Hierarchy
For this tutorial, we have provided a sample PlayerInput asset that has pre-loaded input actions and bindings. If you are following this tutorial with your own assets, see the Madder Controller Usage for more information on how to bind your input actions to the Madder Controller.

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Examining the Sample Scripts

Before we move on, let’s take a look at what each script is doing:
SamplePlayerManager.cs
public class SamplePlayerManager : MonoBehaviour
{
    [SerializeField] private GameObject playerPrefab;
    [SerializeField] private InputActionAsset inputActions;
    private Dictionary<string, PlayerInput> playerInputs = new Dictionary<string, PlayerInput>();


    private void Awake()
    {
        //subscribe to RegisterMadderController event
        MadderManager.onRegisterMadderController += OnRegisterMadderController;
    }
The SamplePlayerManager class is responsible for creating and managing players in the unity scene. On Awake, we subscribe to the onRegisterMadderController event in the MadderManager class. When the Madder server signals that a new player has connected to the room code, the MadderManager will trigger this event, and the SamplePlayerManager will create a new player in the scene.
SamplePlayerManager.cs
    private void OnRegisterMadderController(MadderPlayer madderPlayer)
    {
        RegisterPlayer(madderPlayer.name);
    }

    public void RegisterPlayer(string gamername)
    {
        // Create a new player at a random location between (0,0,0) and (4,4,0)
        GameObject player = Instantiate(playerPrefab, new Vector3(Random.Range(0, 4), Random.Range(0, 4), 0), Quaternion.identity);

        player.name = gamername;
        Debug.Log("Player created: " + player.name);
Next, we need to associate the player with the Madder Controller. We create a new PlayerInput object and assign it to the player. When you create a new PlayerInput object, Unity automatically checks for available input devices and will assign the Madder Controller to the player. See the Madder Controller class for more information.
SamplePlayerManager.cs

        PlayerInput playerInput = player.AddComponent<PlayerInput>();


        if (playerInput == null)
        {
            Debug.Log("PlayerInput is null");
        }

        //We must clone the inputActions to avoid sharing the same instance between players
        InputActionAsset clonedinputActions = Instantiate(inputActions);
        playerInput.actions = clonedinputActions;

        //Store the PlayerInput instance
        playerInputs[gamername] = playerInput;

        //Initialize the player controller
        SamplePlayer playerController = player.GetComponent<SamplePlayer>();
        playerController.Initialize(playerInput);
    }
The SamplePlayerManager class also contains a UnregisterPlayer method that removes a player from the scene. This method is called when the Madder server signals that a player has left the game room.We also have a helper method called TryGetPlayerInput that allows other classes to access the PlayerInput object for a given player, if needed.
SamplePlayerManager.cs
    private void onUnregisterMadderController(MadderPlayer madderPlayer)
    {
        UnregisterPlayer(madderPlayer.name);
    }

    public void UnregisterPlayer(string gamername)
    {
        if (playerInputs.TryGetValue(gamername, out var playerInput))
        {
            playerInputs.Remove(gamername);
            Destroy(playerInput.gameObject);
        }
    }

    public bool TryGetPlayerInput(string gamername, out PlayerInput playerInput)
    {
        return playerInputs.TryGetValue(gamername, out playerInput);
    }
}
SamplePlayerManager.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.InputSystem;

public class SamplePlayerManager : MonoBehaviour
{
[SerializeField] private GameObject playerPrefab;
[SerializeField] private InputActionAsset inputActions;
private Dictionary<string, PlayerInput> playerInputs = new Dictionary<string, PlayerInput>();

    private void Awake()
    {
        //subscribe to RegisterMadderController event
        MadderManager.onRegisterMadderController += OnRegisterMadderController;
    }


    private void OnRegisterMadderController(MadderPlayer madderPlayer)
    {
        RegisterPlayer(madderPlayer.name);
    }

    public void RegisterPlayer(string gamername)
    {
        // Create a new player at a random location between (0,0,0) and (4,4,0)

        GameObject player = Instantiate(playerPrefab, new Vector3(Random.Range(0, 4), Random.Range(0, 4), 0), Quaternion.identity);

        player.name = gamername;
        Debug.Log("Player created: " + player.name);


        PlayerInput playerInput = player.AddComponent<PlayerInput>();


        if (playerInput == null)
        {
            Debug.Log("PlayerInput is null");
        }

        //We must clone the inputActions to avoid sharing the same instance between players
        InputActionAsset clonedinputActions = Instantiate(inputActions);
        playerInput.actions = clonedinputActions;

        //Store the PlayerInput instance
        playerInputs[gamername] = playerInput;

        //Initialize the player controller
        SamplePlayer playerController = player.GetComponent<SamplePlayer>();
        playerController.Initialize(playerInput);
    }

    private void onUnregisterMadderController(MadderPlayer madderPlayer)
    {
        UnregisterPlayer(madderPlayer.name);
    }

    public void UnregisterPlayer(string gamername)
    {
        if (playerInputs.TryGetValue(gamername, out var playerInput))
        {
            playerInputs.Remove(gamername);
            Destroy(playerInput.gameObject);
        }
    }

    public bool TryGetPlayerInput(string gamername, out PlayerInput playerInput)
    {
        return playerInputs.TryGetValue(gamername, out playerInput);
    }

}
The SampleGameManager class exists in this sample to facilitate testing and simulating Madder controller inputs. The SampleGameManager class finds the MadderControllerTest object in the scene, which sends inputs to the Madder Manager as if they were coming from a player’s controller.
SampleGameManager.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SampleGameManager : MonoBehaviour
{
    private static SampleGameManager Instance { get; set; }
    private MadderControllerTest madderControllerTest;
    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(this.gameObject);
            return;
        }
        Instance = this;
        DontDestroyOnLoad(this);
    }

    void Start()
    {
        //only call the following if not in the editor
#if UNITY_WEBGL && !UNITY_EDITOR
        MadderMessager.ShowCode();
#endif
    }

    // Update is called once per frame
    void Update()
    {
#if UNITY_EDITOR
        if (Input.GetKeyDown(KeyCode.J))
        {

            Debug.Log("Testing Madder Controller");
            madderControllerTest = FindObjectOfType<MadderControllerTest>();
            madderControllerTest.TestMadderInput();
        }
#endif
    }
}
The MadderControllerTest simulates Madder controller inputs and sends it to the Madder Manager. The function TestMadderInput registers a new Madder controller with a random name and sends a new controller state with different values after 5 seconds.
MadderControllerTest.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/*
    * MadderControllerTest
    * This class is used to test the MadderController class.
    * This class can be altered.
    */
public class MadderControllerTest : MonoBehaviour
{
    public void TestMadderInput()
    {
        //Register a new madder controller with a random name
        const string chars = "abcdefghijklmnopqrstuvwxyz";
        string randomName = "";
        for (int i = 0; i < 4; i++)
        {
            randomName += chars[Random.Range(0, chars.Length)];
        }
        MadderPlayer madderPlayer = new MadderPlayer();
        madderPlayer.name = randomName;
        string madderPlayerJson = JsonUtility.ToJson(madderPlayer);
        MadderManager.Instance.RegisterMadderController(madderPlayerJson);
        //Create a new controller state that follows MadderControllerState class
        //Wait for 5 seconds
        //Send a new controller state with different values
        StartCoroutine(waiter(randomName));

    }

    IEnumerator waiter(string randomName)
    {
        //Give the controller a random direction to move in
        float x = Random.Range(-1f, 1f);
        float y = Random.Range(-1f, 1f);
        string jsonControllerState = "{\"name\":\"" + randomName + "\",\"joystick\":{\"x\":" + x + ",\"y\":" + y + "},\"circle\":false,\"triangle\":false,\"plus\":false}";
        MadderManager.Instance.UpdateMadderControllerState(jsonControllerState);
        //wait for 5 seconds
        yield return new WaitForSeconds(5);

        //send a new controller state with different values
        jsonControllerState = "{\"name\":\"" + randomName + "\",\"joystick\":{\"x\":0,\"y\":0},\"circle\":false,\"triangle\":false,\"plus\":false}";
        MadderManager.Instance.UpdateMadderControllerState(jsonControllerState);

    }
}