I am doing research in computer graphics and have been using the old HOpenGL to try ideas. Recently I've wanted to use 2D convolution and discovered it wasn't supported in HOpenGL 1.5. I am a bit constrained by time (I have a Ph.D. to finish) and I wanted to know what would be the easiest between: -learning how to build the old HOpenGL 1.5 API and then adding the bindings for the convolution functionnalities -or porting my existing code (which is around a few thousand lines) to use the new most recent API, provided it supports texturing and convolution Unfortunately I am developping under windows XP, using the cygwin environment. If I have to compile the latest version of the GHC distribution to get those functionnalities, I am worried that it may prove very time consuming. Assuming that this is not a problem, how different is the new API from the old one ? Will the changes I'll have to make to my old code be merely cosmetic or more in depth ? Thank you for your help. Yann Morvan