Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Reexamination Certificate
2006-04-18
2006-04-18
Chauhan, Ulka J. (Department: 2671)
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
Reexamination Certificate
active
07030877
ABSTRACT:
The present invention relates to a computer graphics processing system, a memory and a method for use in connection with the computer graphics processing system. In one embodiment, the computer graphics processing system includes a graphics processor and a computer memory responsive to the graphics processor. The computer memory includes an image depth buffer and a hierarchical image depth buffer. The hierarchical image depth buffer contains data items that identify a nearest depth value and a farthest depth value for a plurality of image depth buffer entries associated with a plurality of corresponding pixels. In one embodiment, the method is for use in rendering a portion of an object onto a two-dimensional image plane. A disclosed method includes the steps of identifying a selected pixel corresponding to the portion of the object to be rendered, reading data items from a hierarchical image depth buffer, and performing a comparison between the selected pixel and the data items to make a pixel visibility determination. The data items include a near depth value and a far depth value. The hierarchical image depth buffer is associated with a plurality of depth values for a set of pixels where the set of pixels includes the selected pixel.
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Ned Greene, Michael Kass, Gavin Miller, “Hierarchical Z-Buffer Visibility,” Siggraph Conference Proceedings, Aug. 1993.
Advanced Micro Devices , Inc.
Chauhan Ulka J.
Pappas Peter-Anthony
Zagorin O'Brien Graham LLP
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