System and method for concave polygon rasterization

Details System and method for concave polygon rasterization System and method for concave polygon rasterization

2005-06-30

2008-10-07

Sajous, Wesner (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S545000, C345S549000, C345S588000, C382S283000

Reexamination Certificate

active

07432937

ABSTRACT:
An apparatus and method to render concave polygons. In some embodiments, the method includes setting an alpha buffer of a hardware rasterizer to zero, generating an alpha mask by rendering the concave polygon as a plurality of convex polygons of connected vertices, wherein an alpha value for each of the plurality of the plurality of polygons is toggled between a zero value and a second non-zero value on successive renderings of each portion of the plurality of the convex polygons. The alpha values may be stored in the alpha buffer, and the plurality of convex polygons may be re-rendered based on the generated alpha mask, where the stored alpha value is the second non-zero value.

REFERENCES:
patent: 5123085 (1992-06-01), Wells et al.
patent: 6597363 (2003-07-01), Duluk et al.
patent: 6603482 (2003-08-01), Tidwell
patent: 2003/0201994 (2003-10-01), Taylor et al.

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