Bolt-on Lexitron arcade cabinet compatibility for Unity

LexitronCreateAxes.cs

/* LexitronCreateAxes.cs
 * 
 * 1. Place this script in your project's Assets/Editor/ directory.
 * 2. Open Edit -> Project Settings -> Input and verify that there are four "Lexitron" axes.
 * 3. Delete this script.
 * 
 * All of this code shamelessly swiped from: 
 *   http://www.plyoung.com/blog/manipulating-input-manager-in-script.html
 *   http://answers.unity3d.com/questions/26994/running-a-script-when-unity-starts.html
 */

using UnityEditor;

public enum AxisType {
  KeyOrMouseButton = 0,
  MouseMovement = 1,
  JoystickAxis = 2
};

public class InputAxis {
  public string name;
  public string descriptiveName;
  public string descriptiveNegativeName;
  public string negativeButton;
  public string positiveButton;
  public string altNegativeButton;
  public string altPositiveButton;
  
  public float gravity;
  public float dead;
  public float sensitivity;
  
  public bool snap = false;
  public bool invert = false;
  
  public AxisType type;
  
  public int axis;
  public int joyNum;
}

[InitializeOnLoad]
public class SetupLexitronInputs {
  static void SetupLexitronInputs() {
    AddAxis(new InputAxis() { 
      name = "Lexitron Stick 1 Horizontal", 
      type = AxisType.JoystickAxis, 
      joyNum = 1,
      axis = 6,
      sensitivity = 1f,
      dead = 0.19f
    });

    AddAxis(new InputAxis() { 
      name = "Lexitron Stick 1 Vertical", 
      type = AxisType.JoystickAxis, 
      joyNum = 1,
      axis = 7,
      sensitivity = 1f,
      dead = 0.19f
    });

    AddAxis(new InputAxis() { 
      name = "Lexitron Stick 2 Horizontal", 
      type = AxisType.JoystickAxis, 
      joyNum = 2,
      axis = 6,
      sensitivity = 1f,
      dead = 0.19f
    });

    AddAxis(new InputAxis() { 
      name = "Lexitron Stick 2 Vertical", 
      type = AxisType.JoystickAxis, 
      joyNum = 2,
      axis = 7,
      sensitivity = 1f,
      dead = 0.19f
    });
    
    Debug.Log("Lexitron joystick axes created! See new entries in Edit -> Project Settings -> Input.");
  }

  static void AddAxis(InputAxis axis) {
    if (AxisDefined(axis.name)) return;
    
    SerializedObject serializedObject = new SerializedObject(AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/InputManager.asset")[0]);
    SerializedProperty axesProperty = serializedObject.FindProperty("m_Axes");
    
    axesProperty.arraySize++;
    serializedObject.ApplyModifiedProperties();
    
    SerializedProperty axisProperty = axesProperty.GetArrayElementAtIndex(axesProperty.arraySize - 1);
    
    GetChildProperty(axisProperty, "m_Name").stringValue = axis.name;
    GetChildProperty(axisProperty, "descriptiveName").stringValue = axis.descriptiveName;
    GetChildProperty(axisProperty, "descriptiveNegativeName").stringValue = axis.descriptiveNegativeName;
    GetChildProperty(axisProperty, "negativeButton").stringValue = axis.negativeButton;
    GetChildProperty(axisProperty, "positiveButton").stringValue = axis.positiveButton;
    GetChildProperty(axisProperty, "altNegativeButton").stringValue = axis.altNegativeButton;
    GetChildProperty(axisProperty, "altPositiveButton").stringValue = axis.altPositiveButton;
    GetChildProperty(axisProperty, "gravity").floatValue = axis.gravity;
    GetChildProperty(axisProperty, "dead").floatValue = axis.dead;
    GetChildProperty(axisProperty, "sensitivity").floatValue = axis.sensitivity;
    GetChildProperty(axisProperty, "snap").boolValue = axis.snap;
    GetChildProperty(axisProperty, "invert").boolValue = axis.invert;
    GetChildProperty(axisProperty, "type").intValue = (int)axis.type;
    GetChildProperty(axisProperty, "axis").intValue = axis.axis - 1;
    GetChildProperty(axisProperty, "joyNum").intValue = axis.joyNum;
    
    serializedObject.ApplyModifiedProperties();
  }

  static bool AxisDefined(string axisName) {
    SerializedObject serializedObject = new SerializedObject(AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/InputManager.asset")[0]);
    SerializedProperty axesProperty = serializedObject.FindProperty("m_Axes");
    
    axesProperty.Next(true);
    axesProperty.Next(true);
    while (axesProperty.Next(false)) {
      SerializedProperty axis = axesProperty.Copy();
      axis.Next(true);
      if (axis.stringValue == axisName) return true;
    }
    return false;
  }

  static SerializedProperty GetChildProperty(SerializedProperty parent, string name) {
    SerializedProperty child = parent.Copy();
    child.Next(true);
    do {
      if (child.name == name) return child;
    }
    while (child.Next(false));
    return null;
  }

}

LexitronManager.cs

/* LexitronManager.cs 
 * 
 * https://gist.github.com/mildmojo/027cde9ca4663981cf67
 *
 * Lexitron arcade cabinet compatibility for your game... in a can!
 * 
 * Attach this script to any GameObject in your scene, preferably
 * wherever you're attaching the rest of your global game state
 * manager scripts. Either make sure the script is on an object in
 * every scene or make the object with this script attached survive
 * scene changes by calling DontDestroyOnLoad on it: 
 *   http://docs.unity3d.com/ScriptReference/Object.DontDestroyOnLoad.html
 * 
 * Start the game with the "-lexitron" command line argument to switch
 * on the following Lexitron-specific behaviors:
 * 
 * - 1920x1080 fullscreen
 * - Hides mouse
 * - Coin insert '=' broadcasts OnCoinInsert (calls OnCoinInsert methods in any of your scripts automatically)
 * - LEX button tap '[' broadcasts OnLexButton (calls OnLexButton methods in any of your scripts automatically)
 * - LEX button long-press ']' quits
 * - Quits after 2 minutes of inactivity (no sticks/buttons/keys triggered)
 *
 * Remember to listen for joystick movement on the D-pad (axes 6 and 7).
 * Check Edit -> Project Settings -> Input for the names of the
 * Lexitron-specific joystick axes you can use with `Input.GetAxis()`.
 *
 * See the full dev guidelines at: http://runjumpdev.org/lexitron-game-guidelines
 */

using UnityEngine;
using System;
using System.Linq;

public class LexitronManager : MonoBehaviour {
  [HideInInspector] [NonSerialized]
  public int InactivityTimeout = 120;
  
  [HideInInspector]
  public readonly string[] LEXITRON_AXES = {
    "Lexitron Stick 1 Horizontal", 
    "Lexitron Stick 1 Vertical", 
    "Lexitron Stick 2 Horizontal",
    "Lexitron Stick 2 Vertical"
  };
  
  private float timerInactivity;
  
  public void ResetInactivityTimer() {
    timerInactivity = 0f;
  }
  
  void Awake () {
    // Enable this component if the "-lexitron" command line argument was given.
    this.enabled = Environment.GetCommandLineArgs().Any(arg => arg.Equals("-lexitron"));
    
    // If this isn't the Lexitron, give up.
    if (!this.enabled) return;
    
    // Start the inactivity timer.
    timerInactivity = 0f;
    // Hide the mouse cursor.
    Screen.showCursor = false;
    // Switch to full screen 1080p if not already there.
    if (Screen.width != 1920 || Screen.height != 1080) {
      Debug.Log("Going fullscreen at 1080p...");
      Screen.SetResolution(1920, 1080, true);
    }
  }
  
  void Update () {
    // Update the timer and quit if it's expired.
    timerInactivity += Time.deltaTime;
    if (isAnyInputDown()) ResetInactivityTimer ();
    if (timerInactivity > InactivityTimeout) Application.Quit();

    // Coin insert: '='
    if (Input.GetKeyDown(KeyCode.Equals)) {
      BroadcastMessage("OnCoinInsert");
    }
    
    // LEX button tap: '['
    if (Input.GetKeyDown(KeyCode.LeftBracket)) {
      BroadcastMessage("OnLexButton");
    }
    
    // LEX button held down: ']'
    if (Input.GetKeyDown(KeyCode.RightBracket)) {
      // Handle quitting yourself with BroadcastMessage instead of Application.Quit().
      // BroadcastMessage("OnLexQuitButton");
      Application.Quit();
    }
  }

  bool isAnyInputDown() {
    return Input.anyKey || isAnyAxisHeld();
  }

  bool isAnyAxisHeld() {
    return LEXITRON_AXES.Any(axis => roundAbs(Input.GetAxis(axis)) == 1);
  }
  
  // Take the absolute value of `num` and round to an integer.
  int roundAbs(float num) {
    return (int) Math.Round(Math.Abs(num), 0, MidpointRounding.AwayFromZero);
  }
  
}