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Packages/com.unity.inputsystem/InputSystem/Editor/Internal/BuildProviderHelpers.cs

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+#if UNITY_EDITOR
+
+using System;
+using UnityEditor;
+using UnityEngine.InputSystem.Utilities;
+
+namespace UnityEngine.InputSystem.Editor
+{
+    internal static class BuildProviderHelpers
+    {
+        // Adds the given object to the list of preloaded asset if not already present and
+        // returns the argument given if the object was added to the list or null if already present.
+        public static Object PreProcessSinglePreloadedAsset(Object assetToPreload)
+        {
+            // Avoid including any null asset
+            if (assetToPreload == null)
+                return null;
+
+            // If we operate on temporary object instead of a properly persisted asset, adding that temporary asset
+            // would result in preloadedAssets containing null object "{fileID: 0}". Hence we ignore these.
+            if (EditorUtility.IsPersistent(assetToPreload))
+            {
+                // Add asset object, if it's not in there already.
+                var preloadedAssets = PlayerSettings.GetPreloadedAssets();
+                if (preloadedAssets != null && preloadedAssets.IndexOf(assetToPreload) == -1)
+                {
+                    ArrayHelpers.Append(ref preloadedAssets, assetToPreload);
+                    PlayerSettings.SetPreloadedAssets(preloadedAssets);
+                    return assetToPreload;
+                }
+            }
+
+            return null;
+        }
+
+        // Removes the given object from preloaded assets if present.
+        // The object passed as argument if set to null by this function regardless if existing in preloaded
+        // assets or not.
+        public static void PostProcessSinglePreloadedAsset(ref Object assetAddedByThisProvider)
+        {
+            if (assetAddedByThisProvider == null)
+                return;
+
+            // Revert back to original state by removing all object(s) from preloaded assets that was added by this processor.
+            var preloadedAssets = PlayerSettings.GetPreloadedAssets();
+            while (preloadedAssets != null && preloadedAssets.Length > 0)
+            {
+                var index = Array.IndexOf(preloadedAssets, assetAddedByThisProvider);
+                if (index != -1)
+                {
+                    ArrayHelpers.EraseAt(ref preloadedAssets, index);
+                    PlayerSettings.SetPreloadedAssets(preloadedAssets);
+                    break;
+                }
+            }
+
+            assetAddedByThisProvider = null;
+        }
+    }
+}
+
+#endif // UNITY_EDITOR