add named terrain layers

Source/Editor/CustomEditors/Editors/TerrainLayerEditor.cs

@@ -0,0 +1,45 @@
+// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
+
+using FlaxEditor.Content.Settings;
+using FlaxEditor.CustomEditors.Elements;
+using FlaxEditor.GUI;
+
+namespace FlaxEditor.CustomEditors.Editors
+{
+    /// <summary>
+    /// Custom editor for picking terrain layers. Instead of choosing bit mask or layer index it shows a combo box with simple layer picking by name.
+    /// </summary>
+    public sealed class TerrainLayerEditor : CustomEditor
+    {
+        private ComboBoxElement element;
+
+        /// <inheritdoc />
+        public override DisplayStyle Style => DisplayStyle.Inline;
+
+        /// <inheritdoc />
+        public override void Initialize(LayoutElementsContainer layout)
+        {
+            element = layout.ComboBox();
+            element.ComboBox.SetItems(LayersAndTagsSettings.GetCurrentTerrainLayers());
+            element.ComboBox.SelectedIndex = (int)Values[0];
+            element.ComboBox.SelectedIndexChanged += OnSelectedIndexChanged;
+        }
+
+        private void OnSelectedIndexChanged(ComboBox comboBox)
+        {
+            int value = comboBox.SelectedIndex;
+            if (value == -1)
+                value = 0;
+
+            SetValue(value);
+        }
+
+        /// <inheritdoc />
+        public override void Refresh()
+        {
+            base.Refresh();
+
+            element.ComboBox.SelectedIndex = (int)Values[0];
+        }
+    }
+}

Source/Editor/Surface/Archetypes/Material.cs

@@ -1,6 +1,7 @@
 // Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
 
 using System;
+using FlaxEditor.Content.Settings;
 using FlaxEditor.Scripting;
 using FlaxEditor.Surface.Elements;
 using FlaxEditor.Windows.Assets;
@@ -590,7 +591,7 @@ namespace FlaxEditor.Surface.Archetypes
                 },
                 Elements = new[]
                 {
-                    NodeElementArchetype.Factory.ComboBox(0, 0, 70.0f, 0, FlaxEditor.Tools.Terrain.PaintTerrainGizmoMode.TerrainLayerNames),
+                    NodeElementArchetype.Factory.ComboBox(0, 0, 70.0f, 0, LayersAndTagsSettings.GetCurrentTerrainLayers()),
                     NodeElementArchetype.Factory.Output(0, "", typeof(float), 0),
                 }
             },

Source/Editor/Tools/Terrain/Paint/SingleLayerMode.cs

@@ -60,7 +60,7 @@ namespace FlaxEditor.Tools.Terrain.Paint
         /// <summary>
         /// The layer to paint with it.
         /// </summary>
-        [EditorOrder(10), Tooltip("The layer to paint with it. Terrain material can access per-layer blend weight to perform materials or textures blending.")]
+        [EditorOrder(10), Tooltip("The layer to paint on. Terrain material can access a per-layer blend weight to perform material or texture blending."), CustomEditorAlias("FlaxEditor.CustomEditors.Editors.TerrainLayerEditor")]
         public Layers Layer = Layers.Layer0;
 
         /// <inheritdoc />

Source/Engine/Core/Config/LayersAndTagsSettings.cs

@@ -1,6 +1,7 @@
 // Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
 
 using System.Collections.Generic;
+using System.Linq;
 using System.Runtime.InteropServices;
 using System.Runtime.InteropServices.Marshalling;
 using FlaxEngine;
@@ -30,6 +31,29 @@ namespace FlaxEditor.Content.Settings
             return GetCurrentLayers(out int _);
         }
 
+        /// <summary>
+        /// The layers names.
+        /// </summary>
+        [EditorOrder(10), EditorDisplay("Terrain Layers", EditorDisplayAttribute.InlineStyle), Collection(CanResize = false, Display = CollectionAttribute.DisplayType.Inline)]
+        public string[] TerrainLayers = new string[8];
+
+        /// <summary>
+        /// Gets the current terrain layer names. Returns "Layer" + index for layers without a name.
+        /// </summary>
+        /// <returns>The layer names.</returns>
+        public static string[] GetCurrentTerrainLayers()
+        {
+            string[] layerNames = GameSettings.Load<LayersAndTagsSettings>().TerrainLayers.ToArray();
+
+            for (int i = 0; i < layerNames.Length; i++)
+            {
+                if (string.IsNullOrEmpty(layerNames[i]))
+                    layerNames[i] = $"Terrain Layer {i}";
+            }
+
+            return layerNames;
+        }
+
         [LibraryImport("FlaxEngine", EntryPoint = "LayersAndTagsSettingsInternal_GetCurrentLayers", StringMarshalling = StringMarshalling.Custom, StringMarshallingCustomType = typeof(FlaxEngine.Interop.StringMarshaller))]
         [return: MarshalUsing(typeof(FlaxEngine.Interop.ArrayMarshaller<,>), CountElementName = "layerCount")]
         internal static partial string[] GetCurrentLayers(out int layerCount);