add initial implementation of LDtk importer with data models and scene builder

addons/csharp_ldtk_importer/Models/LdtkData.cs

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+using System.Text.Json.Serialization;
+
+namespace CSharpLdtkImporter.Models;
+
+public class LdtkData
+{
+    [JsonPropertyName("levels")]
+    public LdtkLevel[] Levels { get; set; }
+
+    [JsonPropertyName("defs")]
+    public LdtkDefinitions Defs { get; set; }
+}
+
+public class LdtkDefinitions
+{
+    [JsonPropertyName("tilesets")]
+    public LdtkTilesetDef[] Tilesets { get; set; }
+}
+
+public class LdtkTilesetDef
+{
+    [JsonPropertyName("uid")]
+    public int Uid { get; set; }
+
+    [JsonPropertyName("relPath")]
+    public string RelPath { get; set; }
+    
+    [JsonPropertyName("tileGridSize")]
+    public int TileGridSize { get; set; }
+}

addons/csharp_ldtk_importer/Models/LdtkData.cs.uid

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+uid://8f7a424k36sb

addons/csharp_ldtk_importer/Models/LdtkEntityInstance.cs

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+using System.Text.Json.Serialization;
+
+namespace CSharpLdtkImporter.Models;
+
+public class LdtkEntityInstance
+{
+    [JsonPropertyName("__identifier")]
+    public string Identifier { get; set; }
+
+    [JsonPropertyName("px")]
+    public int[] Px { get; set; }
+}

addons/csharp_ldtk_importer/Models/LdtkEntityInstance.cs.uid

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+uid://ck2tr052fmrx2

addons/csharp_ldtk_importer/Models/LdtkLayerInstance.cs

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+using System.Text.Json.Serialization;
+
+namespace CSharpLdtkImporter.Models;
+
+public class LdtkLayerInstance
+{
+    [JsonPropertyName("__identifier")]
+    public string Identifier { get; set; }
+
+    [JsonPropertyName("__type")]
+    public string Type { get; set; }
+
+    [JsonPropertyName("__gridSize")]
+    public int GridSize { get; set; }
+
+    [JsonPropertyName("__tilesetDefUid")]
+    public int? TilesetDefUid { get; set; } // Nullable for entity layers
+
+    [JsonPropertyName("gridTiles")]
+    public LdtkTileInstance[] GridTiles { get; set; }
+    
+    [JsonPropertyName("autoLayerTiles")]
+    public LdtkTileInstance[] AutoLayerTiles { get; set; }
+
+    [JsonPropertyName("entityInstances")]
+    public LdtkEntityInstance[] EntityInstances { get; set; }
+}

addons/csharp_ldtk_importer/Models/LdtkLayerInstance.cs.uid

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+uid://crre3v7sfnqq6

addons/csharp_ldtk_importer/Models/LdtkLevel.cs

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+using System.Text.Json.Serialization;
+
+namespace CSharpLdtkImporter.Models;
+
+public class LdtkLevel
+{
+    [JsonPropertyName("identifier")]
+    public string Identifier { get; set; }
+
+    [JsonPropertyName("layerInstances")]
+    public LdtkLayerInstance[] LayerInstances { get; set; }
+}

addons/csharp_ldtk_importer/Models/LdtkLevel.cs.uid

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+uid://c5kc2tyb2kf1e

addons/csharp_ldtk_importer/Models/LdtkTileInstance.cs

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+using System.Text.Json.Serialization;
+
+namespace CSharpLdtkImporter.Models;
+
+public class LdtkTileInstance
+{
+    // Pixel coordinates [x,y]
+    [JsonPropertyName("px")]
+    public int[] Px { get; set; }
+
+    // Tile ID in the tileset
+    [JsonPropertyName("t")]
+    public int TileId { get; set; }
+
+    // Flip bits (0=none, 1=X, 2=Y, 3=X&Y)
+    [JsonPropertyName("f")]
+    public int FlipBits { get; set; }
+}

addons/csharp_ldtk_importer/Models/LdtkTileInstance.cs.uid

@@ -0,0 +1 @@
+uid://dal7woqq2nlrd