The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 2002
Filed:
Aug. 03, 1999
Applicant:
Inventors:
John W. Brothers, Palo Alto, CA (US);
Zhou Hong, San Jose, CA (US);
Assignee:
S3 Graphics Co., Ltd., Grand Cayman, KY;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06T 1/140 ;
U.S. Cl.
CPC ...
G06T 1/140 ;
Abstract
A device calculates a display color based on a true color, a fog color, and a distance z. The device uses two single-port memories, an arithmetic circuit, and a color blending circuit. Based on the distance z, two sampled values of a fog function are read from the single-port memories, one value from each memory. The arithmetic circuit calculates an approximate value of the fog function corresponding to the distance z based on the two sampled values of the fog function. The color blending circuit calculates the display color by blending the true color and the fog color according to the approximate value of the fog function.