Efficient Bicubic filtering code in GLSL?

Question

I\'m wondering if anyone has complete, working, and efficient code to do bicubic texture filtering in glsl. There is this:

http://www.codeproject.com/Articles/236394/Bi-

Answer 1

For anybody interested in GLSL code to do tri-cubic interpolation, ray-casting code using cubic interpolation can be found in the examples/glCubicRayCast folder in: http://www.dannyruijters.nl/cubicinterpolation/CI.zip

edit: The cubic interpolation code is now available on github: CUDA version and WebGL version, and GLSL sample.