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Patent Title: Method and processor for drawing `polygon with edge`-type primitives in a computer graphics display system

Assignee: IBM
Patent Number: US5265198
Issue Date: 11-23-1993
Application Number:
File Date:10-23-1989

Abstract: In a computer graphics display system, a method and processor are disclosed for drawing a `polygon with edge`-type primitive encountered in certain high level graphics interface programs. Both the method and processor use a mask buffer organized into a plurality of addressable constituent pixels, each pixel preferably being two bits deep. The method includes: masking the pixels in the mask buffer corresponding to the boundary to the polygon; drawing the pixels in the frame buffer of the display system corresponding to the boundary of the polygon; and drawing the pixels in the frame buffer corresponding to the interior of the polygon with reference to the content of the mask buffer. Corresponding processing steps for writing Z values in a depth buffer are also described. In addition, specific algorithms for implementing the method are set forth, along with an embodiment of a display processor implementing the method.


Link to USPTO

IBM Pledge dated 1/11/2005