Multi-pass graphics rendering system


An "accumulation buffer" process in a graphics processing system is carried out not by rendering each sub-frame making up the accumulated frame in its entirety in turn, but by subjecting each individual tile 2, 3, 4 and 5 making up the accumulated frame to the sequence of different rendering passes individually. Thus, for each individual file making up the accumulated frame, several sub-tiles e.g. 2', 2'', 2''' and 2"" are generated in turn and accumulated together to provide a final accumulation tile 2acc that is output as the accumulated version of the file in question. This is then repeated for each of the remaining individual tiles 5, 4 and 5 making up the accumulated frame 1, and the individual accumulated tiles 2acc, 3acc, 4acc and 5acc are combined together to provide the output accumulated frame 6.




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