05123085 is referenced by 82 patents and cites 8 patents.

A scan conversion process is performed on a polygon using a single pass technique. The pixels which comprise the edges and vertices of the polygon are first determined from the vertices which define the polygon. The alpha channel comprises either a sub-pixel mask associated with each pixel which indicates the amount and sub-pixel regions of coverage or a single value indicative of the percentage of coverage of a pixel. Furthermore, a z value indicative of the depth of each pixel is maintained. The pixels between the edge pixels of the polygon are then turned on, thereby filling the polygon. The pixels which comprise the polygon are then composited with the background pixels on a per pixel basis. The depth value of each pixel of the polygon (the z value) is used to determine the compositing equations to be used to composite each pixel of the polygon to the background. The compositing equations update the color of the pixel, the z buffer value of the background pixel and the sub-pixel mask to reflect the addition of information from the compositing of the pixel of the polygon into the background pixel. Through this method high quality anti-aliased polygons may be rendered without performing the time consuming process of sorting the polygons in depth order prior to compositing.

Title
Method and apparatus for rendering anti-aliased polygons
Application Number
7/495338
Publication Number
5123085
Application Date
March 19, 1990
Publication Date
June 16, 1992
Inventor
Dawn M Wallner
San Jose
CA, US
James V Loo
Los Altos
CA, US
Stuart C Wells
Santa Clara
CA, US
Agent
Blakely Sokoloff Taylor & Zafman
Assignee
Sun Microsystems
CA, US
IPC
G06F 15/62
G06F 15/72
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