Hello gurus
I just pushed the full source code for a GPU based Rice decoder to github. This implementation is able to decompress very quickly on iPhone/iPad devices and MacOSX systems that support Metal. The compression ratios are what one would expect from Rice based compression, the benefit of this implementation is really fast decompression in parallel on the GPU. Please have a look if you are interested.
http://www.modejong.com/blog/post23_metal_rice/