| 摘要 |
A clipping device for reducing the number of processing cycles, and simplifying the circuit, while increasing the speed of the processing. The clipping device has a clip code generation circuit for generating clip codes corresponding to results of a comparison of vertex coordinates of a primitive and a judgment reference value of a multi-dimensional region and a negative value of the judgment reference value for the vertices of the primitive. The clipping device also includes: a current clip register for shifting the clip codes; clip registers able to replace the clip codes in accordance with a control signal; a control circuit outputting a control signal so as to replace the clip codes between clip registers when receiving a replacement instruction; and a logic circuit for performing a logic operation with respect to all bit data set in the clip registers. The device can also set a clip flag indicating whether or not the vertex to be judged is inside or outside a multi-dimensional region of an object to be drawn.
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