| 摘要 |
An efficient system and method for adaptive tile depth filter (ATDF) is disclosed. The key concept of this system and method is to consider more occlusion conditions in order to achieve a better performance of filter before the conventional Z test process in three dimensional graphics pipeline. Two occlusion criteria, Zmax and Zmin (depth range in a tile), are introduced first for occlusion and non-occlusion fragments in a tile. The points between Zmax and Zmin are in uncertain fragment which may need to go through the later Z test. Moreover, a new technique, coverage mask, can further filter the points in the uncertain fragment to a final uncertain fragment and non-occlusion fragment. Besides, the coverage mask can be used to efficiently decide which tile needs the further sub-tile depth filter.
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