Computer magic without the magic wand!
Ivan wrote a long article about image compositing using only standard OpenGL functions (with a few tricks).
This article came to life after he discovered how to do “programmable shaders” type of magic, without actually using programmable shaders. This method is very useful when one wants this kind of effects and doesn’t want to be bound to hardware restrictions of older graphic cards. Note, that Ivan’s method is still run on GPU, so there is no performance hit.
Ivan is also the author of new vector GUI toolkit named Open Class Collection.