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:
Nov. 06, 2007
Filed:
Aug. 06, 2004
Henry Packard Moreton, Woodside, CA (US);
Dominic Acocella, Blainville, CA;
Robert W. Gimby, West Bloomfield, MI (US);
Thomas M. Ogletree, Lakeway, TX (US);
Christopher J. Goodman, Round Rock, TX (US);
Andrew D. Bowen, Austin, TX (US);
David C. Tannenbaum, Austin, TX (US);
Henry Packard Moreton, Woodside, CA (US);
Dominic Acocella, Blainville, CA;
Robert W. Gimby, West Bloomfield, MI (US);
Thomas M. Ogletree, Lakeway, TX (US);
Christopher J. Goodman, Round Rock, TX (US);
Andrew D. Bowen, Austin, TX (US);
David C. Tannenbaum, Austin, TX (US);
NVIDIA Corporation, Santa Clara, CA (US);
Abstract
The VPC unit and setup unit of a graphics processing subsystem perform culling operations. The VPC unit performs culling operations on geometric primitives falling within a specific criteria, such as having a property within a numerical range limit of the VPC unit. This limitation reduces the complexity of the VPC unit. As increasing rendering complexity typically produces a large number of small primitives, the VPC unit can cull many primitives despite its culling limitations. The VPC unit also includes a cache for storing previously processed vertices in their transformed form, along with culling information previously computed for the vertices. To minimize memory bandwidth, the VPC unit retrieves vertex data used for culling operations first. After completing the culling operations, the VPC unit retrieves the attributes of a vertex only if the primitive has not been culled. The VPC unit applies a perspective correction factor to the vertex attributes.