Image generating apparatus, image generating method, and image generating integrated circuit

An image generating apparatus, which can reduce a calculation amount by effectively utilizing a cache resource, generates a graphics image by rendering a polygon and includes a coordinate processing unit loading, from a memory, coordinate data included in vertex data and performing coordinate transform on the loaded coordinate data. The image generating apparatus also includes a determining unit determining whether or not the vertex is a rendering object, using the transformed coordinate data, a shape data cache storing shape data, a shape data processing unit loading, from the memory, the shape data, and storing the loaded shape data in the shape data cache when both of following conditions are satisfied: the vertex is determined to be the rendering object; and the shape data is not yet stored in the shape data cache, and a polygon rendering processing unit rendering the polygon using the transformed coordinate data and the shape data.