Basic light with cached position.

src/Light.h

@@ -0,0 +1,62 @@
+#ifndef Magnum_Light_h
+#define Magnum_Light_h
+/*
+    Copyright © 2010 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License version 3 for more details.
+*/
+
+/** @file
+ * @brief Class Magnum::Light
+ */
+
+#include "Object.h"
+
+namespace Magnum {
+
+/**
+ * @brief Basic light object
+ *
+ * Provides cached light position.
+ */
+class Light: public Object {
+    public:
+        /**
+         * @brief Constructor
+         * @param parent        Parent object
+         */
+        inline Light(Object* parent = 0): Object(parent) {}
+
+        /**
+         * @brief Light position relative to the camera
+         */
+        inline Vector3 position() {
+            setClean();
+            return _position;
+        }
+
+        /**
+         * Recomputes light position.
+         */
+        inline virtual void setClean() {
+            if(!isDirty()) return;
+            _position = transformation(true).at(3).xyz();
+            Object::setClean();
+        }
+
+    private:
+        Vector3 _position;
+};
+
+}
+
+#endif