| 摘要 |
A Z buffer hidden surface removal device calculates the lightness of the sun appearing from behind the cloud and decides whether two planes cross each other or not. The device includes an input-output portion for inputting Z data, an address, and counter data, from the outside and outputting a counter value, Z data, and a write control signal, to the outside. The device further includes a Z buffer portion for reading and writing Z data according to a Z buffer address and a Z buffer portion control signal, a Z operation circuit portion for inputting a Z value and outputting the write control signal and a result of a Z operation, and a counter portion for counting a number of Z data in which the result of the Z operation circuit portion matches with a predetermined condition, among the data that were input to the Z operation circuit portion. There is also disclosed a device in which an A modulator portion for outputting an opacity value from the Z operation result is provided instead of the counter portion. The operations are performed on a pixel basis.
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