...This extension adds graphics primitives (fills, strokes, planes etc.) that mimic flash.display.Graphics-style drawing but implemented in a GPU-friendly manner. It automatically triangulates vector shapes, letting developers use familiar drawing APIs but get performance benefits of GPU rendering via Starling. Starling is an ActionScript 3 library that mimics the conventional Flash display tree architecture. In contrast to conventional display objects, however, Starling "lives" entirely inside the Stage3D environment. That means that all objects are rendered directly by the GPU, which leads to a significant performance boost.