Un rendu sur une texture !

Published in Programming, Code(R) no. 7, March/April 2004.

Programming can be endless fun, and demomakers work that out early: make a visual effect, tune it with well-chosen constants, all in a few hours. The trick taken apart here is one of the best known and still most used corners of OpenGL — render-to-texture. It starts from a plain texture, modifies it through the code, picks up triangle strips along the way, and ends on an effect you are meant to go and spoil for yourself.