#define directives for Input System used

Hi, I am currently implementing both Input Systems in my project. I am wondering if there is a define directive to check if Unity is currently set to legacy, new or both input systems. Thus, only a specific code gets compiled for the build. I checked the docs which mentioned that we could do our own custom directives but I never did that before.

Thank you

 

Unfortunately, there's neither a #define nor a runtime API for that. The best I can offer ATM is a rather lame hack to manually update a #define in your project in the editor based on the current project settings.

Code (CSharp):

1. static class UpdateBuildSettings
2. {
3.     [MenuItem("Tools/Sync New Input System Define")]
4.     public static void SyncNewInputSystemDefine()
5.     {
6.         var playerSettings = Resources.FindObjectsOfTypeAll<PlayerSettings>().First();
7.         var playerSettingsObject = new SerializedObject(playerSettings);
8.         var newInputSystemEnabled =
9.             playerSettingsObject.FindProperty("enableNativePlatformBackendsForNewInputSystem")
10.                 .boolValue;
11.  
12.         var buildTargetGroup = EditorUserBuildSettings.selectedBuildTargetGroup;
13.         var scriptingDefines = PlayerSettings.GetScriptingDefineSymbolsForGroup(
14.             buildTargetGroup);
15.         scriptingDefines.Replace(";NEW_INPUT_SYSTEM_ENABLED", "");
16.         if (newInputSystemEnabled)
17.             scriptingDefines += ";NEW_INPUT_SYSTEM_ENABLED";
18.         PlayerSettings.SetScriptingDefineSymbolsForGroup(
19.             buildTargetGroup, scriptingDefines);
20.     }
21. }
22.  

(There's probably better places than running this from a menu item)

Disclaimer: I haven't actually tried this code. Could be it doesn't even compile. Conceptually, this should work though.

 

On the last update (v. 2019.2+ ) on Unity, you have directives but be careful. Doesn't work very well. I am not sure why.
Documentation: https://docs.unity3d.com/Manual/PlatformDependentCompilation.html
Example:

Code (CSharp):

1. #if (ENABLE_LEGACY_INPUT_MANAGER)
2.         Debug.Log("INPUT_Manager");
3. #elif (ENABLE_INPUT_SYSTEM)
4.         Debug.Log("INPUT_System");
5. #elif (ENABLE_INPUT_SYSTEM && ENABLE_LEGACY_INPUT_MANAGER)
6.         Debug.Log("INPUT_System");
7. #else
8.         Debug.Log("INPUT_Manager");
9. #endif

 

When switch player settings make sure you compile the code again before play mode. Restart Unity editor is not enough.

 

Holy F*** thank you so much! I was tearing my hair out over this one