Method and system for performing MIP map level selection

摘要

A method and system for processing textures for a graphical image on a display is disclosed. The graphical image includes a plurality of polygons. Each of the plurality of polygons includes at least one fragment. The fragment includes at least one texture and a w-value for the fragment. Each polygon has a plurality of vertices, a display area, and a texture space area. Each of the vertices has a vertex w-value. The at least one texture is associated with at least one MIP map. The MIP map includes a plurality of MIP map levels. The method and system include determining a selection value for each fragment of a polygon of the plurality of polygons. The selection value includes ½ multiplied by the base two logarithm of the texture area divided by the display area and divided by the product of the vertex w-values for each of the plurality of vertices. The selection value also includes 3/2 multiplied by the base two logarithm of the w-value for each of the at least one fragment. The selection value also includes a MIP map bias. The method and system also include selecting at least one of the plurality of MIP map levels map for each fragment based on the selection value for each fragment.