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:
Sep. 10, 2002
Filed:
Jul. 26, 1999
Applicant:
Inventor:
Chien-Chung Hsiao, Penhu Hsien, TW;
Assignee:
Silicon Integrated Systems Corp., Hsinchu, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06T 1/540 ;
U.S. Cl.
CPC ...
G06T 1/540 ;
Abstract
Memory bandwidth is the bottleneck in a three-dimensional display system. A method with Z-Buffer pre-test reduces the memory accesses in the three-dimensional graphics system. This method includes two depth(Z) caches, a control logic for controlling memory access and two Z(depth) cache mechanisms. If the incoming pixel with Z-Buffer pre-test fails, then the pixel is discarded. Thus, the following texture mapping and other tests for the pixel are eliminated and memory accesses are reduced.