Occlusion queries in graphics processing
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United States of America Patent
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Dec 30, 2014
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app pub date -
Sep 20, 2012
filing date -
Sep 22, 2011
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Abstract
The fragment processing pipeline 10 of a graphics processing core 2 has an associated occlusion query cache 19 that is used to maintain a set of local occlusion counters 21. The occlusion query cache 19 is maintained in a local memory 3 of the graphics processing system and can communicate via an interconnect 7 with a set of master occlusion counters 22 in a main memory 5 for the graphics processing system. When an occlusion query starts, a corresponding occlusion counter 22 is initialised in the main memory 5. A corresponding local occlusion counter 21 is also provided in the occlusion query cache 19 in the local memory 3 of the graphics processor, and is used to count the results of the occlusion query. The local occlusion counter value is written back to the occlusion counter 22 for the query in the main memory 5 at the appropriate time for further processing.
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