Method and apparatus for high speed linear shading in a raster g

Details Method and apparatus for high speed linear shading in a raster g Method and apparatus for high speed linear shading in a raster g

1989-04-03

1991-07-30

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340747, 364521, G09G 536

Patent

active

050363166

ABSTRACT:
A method and apparatus for linear shading of a polygon rendered in a raster graphics display is disclosed. Apparatus is included for selecting a key vertex which is located opposite to an edge of the polygon having a selected orientation. Apparatus is further included for dividing the polygon into a group of triangles so as to create a base leg for each of the triangles in the selected orientation. Apparatus is further included for calculating the horizontal endpoints and their associated luminance values for each scan line between each triangle's base and the bases opposite vertex so as to describe a plurality of scan lines further comprising a plurallity of pixels within each triangle. Apparatus for interpolating the luminance of each of the scan line pixels so as to shade each of the triangles completes the linear shading. In one embodiment of the invention, the pixel luminance values for several pixels can be simultaneously calculated resulting in greatly improved throughput as compared to known systems.

REFERENCES:
patent: 4658247 (1987-04-01), Gharachorloo
patent: 4901251 (1990-02-01), Sfarti
patent: 4944034 (1990-07-01), Ohsawa
IBM Technical Disclosure Bulletin, vol. 28 No. 7, Dec. 1985 pp. 3080 and 3081.

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