Method and apparatus for processing primitives in a computer gra

Details Method and apparatus for processing primitives in a computer gra Method and apparatus for processing primitives in a computer gra

1997-04-29

1999-03-23

Tung, Kee M.

Computer graphics processing and selective visual display system

Computer graphic processing system

Plural graphics processors

345519, 345426, 345507, G06F 1516

Patent

active

058867112

ABSTRACT:
The present invention provides a method and apparatus for processing primitives in a computer graphics display system. The present invention comprises a geometry accelerator for processing polygons to provide two-sided lighting for front and back facing polygons. The geometry accelerator comprises a lighting machine and a memory device in communication with the lighting machine. The geometry accelerator receives command data, vertex data, and parameter data from a central processing unit (CPU) of a computer graphics display system. The vertex data comprises polygon vertex color data, vertex coordinate data and vertex normal data. The parameter data comprises front and back material parameters. The command data comprises information relating to the type of primitive to be processed by the lighting machine. The geometry accelerator looks at the command data to determine whether the polygon is a front or back facing polygon and informs the lighting machine as to whether the polygon is a front or back facing polygon. The lighting machine will then fetch the correct set of material parameters and use them to calculate lighting.

REFERENCES:
patent: 5357599 (1994-10-01), Luken
patent: 5574835 (1996-11-01), Duluk, Jr. et al.

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