Graphics system with an improved filtering adder tree

Details Graphics system with an improved filtering adder tree Graphics system with an improved filtering adder tree

2006-01-24

2006-01-24

Brier, Jeffery (Department: 2672)

Computer graphics processing and selective visual display system

Computer graphics processing

Graphic manipulation

C708S629000, C708S707000, C708S708000

Reexamination Certificate

active

06989843

ABSTRACT:
A sample-to-pixel calculation unit in a graphics system may comprise an adder tree. The adder tree includes a plurality of adder cells coupled in a tree configuration. Input values are presented to a first layer of adder cells. Each input value may have two associated control signals: a data valid signal and a winner-take-all signal. The final output of the adder tree equals (a) a sum of those input values whose data valid signals are asserted provided that none of the winner-take-all signals are asserted, or (b) a selected one of the input values if one of the winner-take-all bits is asserted. The selected input value is the one whose winner-take-all bit is set. The adder tree may be used to perform sums of weighted sample attributes and/or sums of coefficients values as part of pixel value computations.

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