Appeal No. 1999-1845
Application No. 08/659,132
1. A rendering system comprising:
means for decomposing primitives into
fragments to be rendered;
a processor for computing depth
values, and color values including a
blending parameter, for individual ones of
said fragments;
means for reading a local buffer
memory in which depth and/or color values
are stored, and for comparing the compound
depth values for individual ones of said
fragments against values retrieved from
said local buffer, and conditionally
storing the computed depth or color values
depending on the results of the comparison;
and
circuitry for forcing the blend
parameter to a predetermined value;
whereby said circuitry for forcing can
assure that no color value will ever be
equal to a depth value, even when color and
depth values are overwritten into the same
set of address locations.
The examiner relies on the following references:
Deering 4,885,703 Dec. 05, 1989
Hardy et al. (Hardy) 5,640,496 Jun. 17, 1997
(filed Feb. 04,
1991)
Claims 1-21 stand rejected under 35 U.S.C. § 103. As
evidence of obviousness the examiner offers Deering in view of
Hardy.
2
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