Other operation counts
Texture Coordinate conversion from (s,t) to (u,v) counts as 1 op for each coordinate
Texel lookup counts as one op
Weighting factor calculation for linear texture mapping
In the ‘linear’ part of trilinear mapping, count this as two ops:
Ti texel from bilinear calculation on mipmap i
Wi weight for mipmap i, a calculation in its own right
Ti+1 texel from bilinear calculation on mipmap i+1
Wi+1 weight for mipmap i+1