GRAPHICS PROCESSING

When processing graphics fragments within a processing stage of a graphics processing pipeline, wherein the graphics fragments each represent a set of one or more sampling points to be processed, comparing sampling points with each other at an input of the processing stage to determine whether multiple of the sampling points would give the same processing result when processed by the processing stage so that a first one of the sampling points can be processed and the processing result for that sampling point can then be duplicated at the output for other processing results determined to give the same processing result.