add MaterialTileMapping libgdx asset loader

src/main/java/ca/blarg/gdx/tilemap3d/json/tilemesh/MaterialTileMappingLoader.java

@@ -0,0 +1,42 @@
+package ca.blarg.gdx.tilemap3d.json.tilemesh;
+
+import ca.blarg.gdx.graphics.atlas.TextureAtlas;
+import ca.blarg.gdx.tilemap3d.tilemesh.MaterialTileMapping;
+import com.badlogic.gdx.assets.AssetDescriptor;
+import com.badlogic.gdx.assets.AssetLoaderParameters;
+import com.badlogic.gdx.assets.AssetManager;
+import com.badlogic.gdx.assets.loaders.AsynchronousAssetLoader;
+import com.badlogic.gdx.assets.loaders.FileHandleResolver;
+import com.badlogic.gdx.files.FileHandle;
+import com.badlogic.gdx.utils.Array;
+
+@SuppressWarnings("unchecked")
+public class MaterialTileMappingLoader extends AsynchronousAssetLoader<MaterialTileMapping, MaterialTileMappingLoader.MaterialTileMappingParameter> {
+	public static class MaterialTileMappingParameter extends AssetLoaderParameters<MaterialTileMapping> {
+	}
+
+	public MaterialTileMappingLoader(FileHandleResolver resolver) {
+		super(resolver);
+	}
+
+	JsonMaterialMapping definition;
+	MaterialTileMapping mapping;
+
+	@Override
+	public Array<AssetDescriptor> getDependencies(String fileName, FileHandle file, MaterialTileMappingParameter parameter) {
+		definition = MaterialTileMappingJsonLoader.load(file);
+		Array<AssetDescriptor> deps = new Array<AssetDescriptor>();
+		deps.add(new AssetDescriptor(definition.textureAtlas, TextureAtlas.class));
+		return deps;
+	}
+
+	@Override
+	public void loadAsync(AssetManager manager, String fileName, FileHandle file, MaterialTileMappingParameter parameter) {
+		mapping = MaterialTileMappingJsonLoader.create(definition, manager);
+	}
+
+	@Override
+	public MaterialTileMapping loadSync(AssetManager manager, String fileName, FileHandle file, MaterialTileMappingParameter parameter) {
+		return mapping;
+	}
+}