Patent ID: 7116334

Claim:
A game system which generates an image, comprising: a memory which stores a program and data for image generation; and at least one processor which is connected to the memory and performs processing for image generation, at least one processor including: an index number setting section which sets image information of an original image as an index number in a lookup table for index color texture-mapping, the index color texture-mapping being texture-mapping which maps a texture onto a virtual object while referring to the lookup table, the index number being set to each texel of the texture in a texture space, and the texture linking to image information to be texture-mapped; and a drawing section which transforms the image information of the original image by performing index color texture-mapping on the virtual object by using the lookup table in which the image information of the original image is set as the index number, the virtual object constituting polygons having a size equal to a size of a block obtained by dividing a display screen into blocks, wherein the index number setting section sets the index number corresponding to the image information of the original image for each of the blocks, which are specified by dividing the display screen, and the drawing section performs the index color texture-mapping on each of the polygons for each of the corresponding divided blocks.