Abstract: A parameter setting unit sets a parameter used in a predetermined interpolation calculation. A calculating unit performs the predetermined interpolation calculation based upon an input parameter. A feedback unit feeds back a value obtained through the predetermined interpolation calculation to the parameter setting unit. Then, the parameter setting unit resets the parameter based upon the value obtained through the predetermined interpolation calculation. Accordingly, an image rendering apparatus easily implements nonlinear interpolation by DDA processing which performs linear interpolation using polygon node coordinates in, for example, computer graphics, and implements rendering of, for example, curved line portions quickly and with light processing loads.

Abstract: An image rendering device holds a table which contains color and brightness values at positions specified by two-dimensional coordinates, where the color values are aligned so as to express a gradation of color tone along one coordinate axis of the two-dimensional coordinate, and the brightness values are aligned so as to express a gradation of brightness along the other coordinate axis. The image rendering device finds parameters corresponding to at least one of color and brightness of a polygon to be rendered, and generates an address for referencing a two-dimensional coordinate corresponding to each pixel composing the polygon based on the parameters. The image rendering device then acquires from the table color and/or brightness values corresponding to the address for referencing the two-dimensional coordinate. This successfully realizes natural expression by the image rendering device without preparing in advance a huge number of textures.

Abstract: A modeling section and geometry processing section collectively generate draw data used for a series of draw processing, and a control section transfers the generated draw data to a multi-path buffer. The draw processing is executed, under control of the control section, when a multi-path controller serially reads out the draw data stored in the multi-path buffer and outputs them to a rendering engine. This successfully saves the band width necessary for transfer of the draw data from a main processor to a graphic processor, and relieve the main processor from the process load.

Abstract: A value for expressing the fraction of the area occupied by a polygon within a pixel and a value for expressing the degree of transparency of the pixel are multiplied together for each pixel. The multiplied product is reset as the degree of transparency for each pixel, according to which a color preset for each pixel composing the polygon is mixed with the colors of other pixels rendered on a two-dimensional coordinate which is substantially the same as that for the pixels composing the polygon. This allows semi-transparent polygons to be processed by anti-aliasing without being changed into opaque polygons.

Abstract: A rendering processing device acquires a shift value for shifting a texel coordinate value generated from the apex coordinate values of a polygon, corrects the texel coordinate value using the shift value, acquires color information from a texture table based on the corrected texel coordinate value, and then assigns the color information to the polygon. The rendering processing device thus can move patterns or the like on the surface of the polygon without moving the polygon per se.