1.A complete suite of tools and downloadable applications for making classic 2D and 3D animation right out of the box
2.FBOs, VBOs, VAOs and integer-related functions such as glFrameNumber and glMovieType
3.Accumulation buffers, frame-buffer objects, VBOs, depth, and stencil buffers, blending modes, and other types of buffers that allow a developer to achieve the desired effect
4. No way to draw pixels on the screen