FOG EFFECT PROCESSING METHOD, GRAPHICS DEVICE, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE FOR GRAPHICS, AND FOG EFFECT PROCESSING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a graphics device capable of performing an excellent fog effect processing with a simple arithmetic operation.;SOLUTION: The graphics device performing a fog effect processing that generates a fog effect includes: a basic approximate data table for dividing a variation of fog density when a depth varies based on a processing algorithm that generates the fog effect into a plurality of regions according to the depth to linearly approximate the variation of fog density in each region, table memories 32 and 36 for storing an index value I corresponding to the data table, correction depth value computing circuits 33 to 35 for computing a correction depth value using a coordinate transformation matrix changing a coordinate position of a display image to a depth value, and an index value, a table region determining circuit 36 for determining a region corresponding to the basic approximation data table from a high-order bit value of the correction depth value, and a color information computing circuit for computing a fog density by applying a low-order bit value of the correction depth value to linear approximating the corresponding region to compute color information having the fog effect.;COPYRIGHT: (C)2008,JPO&INPIT