Filtering method and apparatus for anti-aliasing
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United States of America Patent
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Apr 28, 2015
Grant Date -
May 2, 2013
app pub date -
Dec 21, 2012
filing date -
Apr 4, 2008
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Abstract
A filtering method and apparatus for anti-aliasing takes advantage of improved existing hardware by using as input the data stored in the multisampling anti-aliasing (MSAA) buffers after rendering. The standard hardware box-filter is then replaced with a more intelligent resolve implemented using shader programs. Embodiments find scene edges using existing samples generated by Graphics Processing Unit (GPU) hardware. Using samples from a footprint larger than a single pixel, a gradient is calculated matching the direction of an edge. A non-linear filter over contributing samples in the direction of the gradient gives the final result.
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