| 摘要 |
A polygon outline shape processing device uses transformed vertex information from a geometric transformation device and, for each scan-line, converts polygon X, Y vertex information, mapping pattern vertex information and polygon Z-value information into polygon outline information. A horizontal interpolation device interpolates for the polygon interior, for each scan-line, using the polygon outline information provided by the polygon outline shape processing device. A hidden surface removal device performs a hidden surface removal operation as a result of comparing Z values of dots on a scan-line with Z values of corresponding dots previously stored in a Z-value line memory. A pixel drawing device determines mapping pattern information of dots on a scan-line, using polygon interior information provided by the horizontal interpolation device. In a pixel line memory the mapping pattern information of the dots on the scan-line is written when the result of the hidden surface removal operation allows the dots to be drawn. The mapping pattern information is used for reading out image information of basic patterns to be drawn from a mapping pattern memory.
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