added invalidateBufferData to the Buffer class

include/ACGL/OpenGL/Objects/Buffer.hh

@@ -344,6 +344,16 @@ public:
      */
     virtual inline void setTarget( GLenum _target ) { mTarget = _target; }
 
+    /**
+     * @brief invalidateBufferData is a performance optimization and will invalidate the whole
+     * buffer. Before GL 4.3 this is a NO-OP.
+     */
+    void invalidateBufferData() {
+#if (ACGL_OPENGL_VERSION >= 43)
+        glInvalidateBufferData( getObjectName() );
+#endif
+    }
+
     // =================================================================================================== \/
     // ============================================================================================ FIELDS \/
     // =================================================================================================== \/