| 摘要 |
PROBLEM TO BE SOLVED: To speed up the generation of a clip code by performing the 1st step of a clip processing, i.e., deciding whether or not a primitive is put in a view volume through hardware. SOLUTION: When values written in registers 231 to 236 are all '1', that shows that a vertex is put in the view volume. In other words, whether or not the vertex is in the view volume is known by only judging whether or not the values written in the registers 231 to 236 are all '1'. A clip code generation decision part 20 is equipped with a 6-input AND gate 24 for a demand like above, and the contents of the registers 231 to 236 are ANDed to output a decision signal M1. |
