first commit

public/sdk/three/jsm/renderers/common/DataMap.js

@@ -0,0 +1,54 @@
+class DataMap {
+
+	constructor() {
+
+		this.data = new WeakMap();
+
+	}
+
+	get( object ) {
+
+		let map = this.data.get( object );
+
+		if ( map === undefined ) {
+
+			map = {};
+			this.data.set( object, map );
+
+		}
+
+		return map;
+
+	}
+
+	delete( object ) {
+
+		let map;
+
+		if ( this.data.has( object ) ) {
+
+			map = this.data.get( object );
+
+			this.data.delete( object );
+
+		}
+
+		return map;
+
+	}
+
+	has( object ) {
+
+		return this.data.has( object );
+
+	}
+
+	dispose() {
+
+		this.data = new WeakMap();
+
+	}
+
+}
+
+export default DataMap;