Patent ID: 6738070
Filing Date: 2004-05-18
Classification: G06T,G09G

Abstract:
A method of retrieving a desired mipmap from one or more mipmaps, the method comprising the steps of:determining a base address of a row of mipmaps containing the desired mipmap; determining an offset to the desired mipmap from the base address, wherein the determining the offset further comprises: determining whether the desired mipmap is the first mipmap, in the row; upon a determination that the desired mipmap is the first mipmap, setting an offset address to 0; and upon a determination that the desired mipmap is not the first mipmap, setting the offset address to a value bit-filled with ones from a first bit position to a second bit position, wherein the first bit position corresponds to the exponent of the width of a base map and the second bit position corresponds to the exponent of the width of the base map less a row position of the row less 1; determining an indexed address of the desired mipmap as the sum of the base address and the offset; and retrieving the desired mipmap at the indexed address.