| 摘要 |
PROBLEM TO BE SOLVED: To allow accurate texture mapping even on a polygon outline. SOLUTION: This circuit interpolates linearly a geometric coordinate value defined on a polygon apex, a texture mapping address and the like. The circuit outputs crossing information of the outline and a pixel to an FIFO memory. The circuit reads out outline information, when receiving the outline information to be compared with an x-axis coordinate value and when a point under interpolation is one on the outline, to find an x-axial coordinate value or a y-axial coordinate value, a texture mapping coordinate value and a perspective transformation relation value, in a point where the outline is crossed with a grid. Distances between the x- and y-coordinate values and between the texture coordinate values are calculated using not grid crossing information but adjacent pixel information, even on the outline, and further a polygon magnification and a texture ratio are found by dividing those distances, respectively. A texture RAM address generator receives calculation results therein to select the optimum pattern. Brightness in an interpolation point is determined based on the texture information and the like. COPYRIGHT: (C)2008,JPO&INPIT
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