Direct Calculation of MIP

Wu, Kevin

HP Development Company

关键词: computer graphics;    texture mapping;    MIP mapping;    trilinear filtering;    floating-point arithmetic;   

RP-ID  :  HPL-98-112

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

This paper describes a method applicable to texture mapping for calculating the MIP-map level directly from the IEEE-standard floating-point representation of the compression value. This calculation ordinarily requires execution of a base-2 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 MIP-map level is essentially the base-2 exponent of the MIP map compression value, and this exponent is immediately available from the IEEE-standard floating- point representation. 6 Pages