System and method for computing filtered shadow estimates using reduced bandwidth
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United States of America Patent
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Sep 12, 2006
Grant Date -
Sep 9, 2004
app pub date -
Mar 3, 2003
filing date -
Mar 3, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A graphical processing system comprising a computational unit and a shadow processing unit coupled to the computational unit through a communication bus. The computational unit is configured to transfer coordinates C.sub.1 of a point P with respect to a first space to the shadow processing unit. In response to receiving the coordinates C.sub.1, the shadow processing unit is configured to: (a) transform the coordinate C.sub.1 to determine map coordinates s and t and a depth value D.sub.p for the point P, (b) access a neighborhood of depth values from a memory using the map coordinates s and t, (c) compare the depth value D.sub.P to the depth values of the neighborhood, (d) filter binary results of the comparisons to determine a shadow fraction, and (e) transfer the shadow fraction to the computational unit through the communication bus.
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