Added the draco support for UWP and iOS

Plugins/draco/GLTFUtilityDracoLoader.cs

@@ -98,48 +98,54 @@ public class AsyncMesh {
 		public Color[] colors;
 	}
 
+#if !UNITY_EDITOR && (UNITY_WEBGL || UNITY_IOS)
+        const string DRACODEC_UNITY_LIB = "__Internal";
+#elif UNITY_ANDROID || UNITY_STANDALONE || UNITY_WSA || UNITY_EDITOR || PLATFORM_LUMIN
+	const string DRACODEC_UNITY_LIB = "dracodec_unity";
+#endif
+
 	// Release data associated with DracoMesh.
-	[DllImport("dracodec_unity")] private static extern void ReleaseDracoMesh(
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern void ReleaseDracoMesh(
 		DracoMesh * * mesh);
 	// Release data associated with DracoAttribute.
-	[DllImport("dracodec_unity")] private static extern void
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern void
 	ReleaseDracoAttribute(DracoAttribute * * attr);
 	// Release attribute data.
-	[DllImport("dracodec_unity")] private static extern void ReleaseDracoData(
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern void ReleaseDracoData(
 		DracoData * * data);
 
 	// Decodes compressed Draco::Mesh in buffer to mesh. On input, mesh
 	// must be null. The returned mesh must released with ReleaseDracoMesh.
-	[DllImport("dracodec_unity")] private static extern int DecodeDracoMesh(
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern int DecodeDracoMesh(
 		byte[] buffer, int length, DracoMesh * * mesh);
 
 	// Returns the DracoAttribute at index in mesh. On input, attribute must be
 	// null. The returned attr must be released with ReleaseDracoAttribute.
-	[DllImport("dracodec_unity")] private static extern bool GetAttribute(
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern bool GetAttribute(
 		DracoMesh * mesh, int index, DracoAttribute * * attr);
 	// Returns the DracoAttribute of type at index in mesh. On input, attribute
 	// must be null. E.g. If the mesh has two texture coordinates then
 	// GetAttributeByType(mesh, AttributeType.TEX_COORD, 1, &attr); will return
 	// the second TEX_COORD attribute. The returned attr must be released with
 	// ReleaseDracoAttribute.
-	[DllImport("dracodec_unity")] private static extern bool GetAttributeByType(
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern bool GetAttributeByType(
 		DracoMesh * mesh, AttributeType type, int index, DracoAttribute * * attr);
 	// Returns the DracoAttribute with unique_id in mesh. On input, attribute
 	// must be null.The returned attr must be released with
 	// ReleaseDracoAttribute.
-	[DllImport("dracodec_unity")] private static extern bool
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern bool
 	GetAttributeByUniqueId(DracoMesh * mesh, int unique_id,
 		DracoAttribute * * attr);
 
 	// Returns an array of indices as well as the type of data in data_type. On
 	// input, indices must be null. The returned indices must be released with
 	// ReleaseDracoData.
-	[DllImport("dracodec_unity")] private static extern bool GetMeshIndices(
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern bool GetMeshIndices(
 		DracoMesh * mesh, DracoData * * indices);
 	// Returns an array of attribute data as well as the type of data in
 	// data_type. On input, data must be null. The returned data must be
 	// released with ReleaseDracoData.
-	[DllImport("dracodec_unity")] private static extern bool GetAttributeData(
+	[DllImport(DRACODEC_UNITY_LIB)] private static extern bool GetAttributeData(
 		DracoMesh * mesh, DracoAttribute * attr, DracoData * * data);
 
 	// Decodes a Draco mesh, creates a Unity mesh from the decoded data and