| 摘要 |
PURPOSE:To attain the high speed of the hidden-surface processing. CONSTITUTION:When a depth buffer memory 8 is initialized, the depth buffer memory itself is not initialized and the only initialized bit in a memory 38 corresponding to the initialized bit in the depth buffer memory 8 is initialized. When the initialized bit in the memory 38 is initialized at the time of the execution of the hidden-surface processing, the said initialized bit makes the non- initialized state and the latest Z coordinate data from a coordinate data generation means (a straight line generator 7) is written in the depth buffer memory 8 unconditionally. When the initialized bit in the memory 38 is in the non- initialized state, the Z coordinate data in the depth buffer memory 8 and the latest Z coordinate data from the coordinate data generation means (the straight line generator 7) are compared in a comparison means (a comparator 40). The hidden-surface processing is executed with this compared result and the three- dimensional graphic display is performed. |
