Apparatus and method for generating point sample masks in a graphics display system
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United States of America Patent
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Nov 29, 1994
Grant Date -
N/A
app pub date -
Jul 9, 1993
filing date -
Jul 9, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
In a computer graphics system, a method of generating a geometrically valid point sample mask corresponding to a pixel. A separate mask is generated for each edge of a polygon. These masks specify whether particular subsample points are within a half-plane defined by an edge of the polygon. This information is determined by examining the sign of vertical or horizontal distance metrics corresponding to those sample points. These separate masks are merged to form the final point sample mask. Thereby, the final point sample mask contains information specifying whether particular sample points reside within the polygon. This information is used in rendering the pixel for display by the computer graphics system.
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