HP Labs Technical Reports
Click here for full text:
Direct Calculation of MIP  Map Level for Faster Texture Mapping
Wu, Kevin
HPL98112
Keyword(s): computer graphics; texture mapping; MIP mapping; trilinear filtering; floatingpoint arithmetic
Abstract: This paper describes a method applicable to texture mapping for calculating the MIPmap level directly from the IEEEstandard floatingpoint representation of the compression value. This calculation ordinarily requires execution of a base2 logarithm, and it needs to be performed once per pixel. However, the full logarithm need not be evaluated because only the integer part of the result is required. The MIPmap level is essentially the base2 exponent of the MIP map compression value, and this exponent is immediately available from the IEEEstandard floating point representation.
6 Pages
Back to Index
