bicubic texture mode

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Mike Goslin (goslin++at++cs.unc.edu)
Wed, 21 Feb 1996 12:14:45 -0500 (EST)

I'm getting some unusual results when using TX_BICUBIC mode for
texturing. This is really a GL problem, because I have the same problem
in GL as I get in Performer. Could someone refer me to the appropriate
person on this (or pass this on to him/her)?

Here's the problem: I'm using TX_BICUBIC mode to filter a texture map
and I'm seeing artifacts that are texel-related. The smoothness of the
image falls somewhere between TX_POINT and TX_BILINEAR in quality. The
image itself is a texture map generated by sampling a bicubic lighting
function for a particular surface, so it is really an intensity
gradient. The image is 32x32, and I'm using 4 components with 16 bits
per component (TX_INTERNAL_FORMAT is TX_RGBA_12).

TX_BICUBIC seems to work okay for smaller textures (4x4), but I figured
this might be related to the kernel size for the bicubic filter because
it doesn't need to be shifted to filter the entire image.

Thanks,

Mike
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    Mike Goslin (goslin++at++cs.unc.edu)
    The University of North Carolina at Chapel Hill
    Department of Computer Science office: (919)962-1719
    CB# 3175 Sitterson Hall fax: (919)962-1799
    Chapel Hill, North Carolina 27599 home: (919)942-0043

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