Multiplier for performing 3d graphics interpolations

G - Physics – 06 – F

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G06F 7/38 (2006.01) G06F 7/52 (2006.01) G06F 7/544 (2006.01)

Patent

CA 2272567

A multiplier array is modified to perform interpolations. The interpolations use a normalized first operand A between 0 and 1. The interpolation is the function B*A+C*(1-A). Standard multipliers accept two operands as inputs, but interpolations require 3 operands (A, B, C). The AND gates in Booth encoders (30) in a standard multiplier array are replaced by multiplexers. Each multiplexer selects a bit from one of the two operands (B or C) based on a bit of the first operand A. The interpolate operation multiplies the first operand A by the second operand B while simultaneously multiplying the bit-wise inverse of the first operand A' by the third operand C.

La présente invention concerne une matrice scalaire modifiée pour réaliser des interpolations. Les interpolations utilisent un premier opérande A normalisé compris entre 0 et 1. L'interpolation est une fonction de type B*A+C* (1-A). Les multiplicateurs standards ont pour défaut de prendre en compte deux opérandes en entrée alors que les interpolations nécessitent trois opérandes (A, B, C). Les portes ET des codeurs de Booth (30) d'une matrice scalaire standard sont remplacés par des multiplexeurs. Chaque multiplexeur sélectionne un bit de l'un des deux opérandes (B ou C) défini par rapport à un bit du premier opérande (A). L'opération d'interpolation consiste, ici, à multiplier le premier opérande (A) par le second opérande (B) tout en multipliant l'inverse binaire du premier opérande (A) par le troisième opérande (C).

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