Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
2006-06-20
2006-06-20
Chauhan, Ulka J. (Department: 2671)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C345S506000, C345S592000
Reexamination Certificate
active
07064771
ABSTRACT:
A graphics data processing apparatus includes a graphics memory having pixel storage for storing up to a predetermined number of fragment values for the pixel. Each stored fragment value is associated with a fragment of an image that is visible in that pixel. When a new fragment is determined to be visible in the pixel, but all the available fragment values for the pixel are already in use, one of the previously stored fragment values is either replaced by, or combined with the fragment value for the new fragment. The resulting new fragment value is used to determine the color of the pixel. Alternately, if the new fragment is determined to be totally occluded by one or more of the other fragments, the new fragment may be discarded. Z-depth and Z gradient information is stored each fragment. This Z information is used to determine the relative depth values of the fragments, which in turn is used to determine which fragment to discard or to combine with another fragment when all the available fragment values for a pixel are already in use.
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Chang Chun-Fa
Jouppi Norman P.
Chauhan Ulka J.
COMPAQ Information Technologies Group, L.P.
Pennie & Edmonds LLP
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