To improve a graphics displaying speed by executing the hiding selection of a primitive.
A depth comparing circuit 33 inputting the primitive to express from a central processor compares the input depth value of each address in this primitive with the present depth value of a pixel expressed by a corresponding address. A result signal provided with a first logical value when an inputted depth value is visible but provided with a second logical value when the inputted depth value is hidden by the expressed pixel is generated. These logical values are latched to generate first and second logical level signals. When a first logical level is not latched, all the primitives in the group are hidden by primitives expressed before. Thus, the storage of a depth value to a depth buffer or the storage of a color value to a color buffer a is executed concerning a belonging pixel.
| WO/2001/055970 | GAME SYSTEM AND IMAGE CREATING METHOD |
| WO/1993/008537 | PROCESS AND CIRCUITRY FOR SUPPRESSING CONCEALED PICTURE ELEMENTS |
SCOTT NOEL D
CASEY ROBERT J
