Graphical object primitive loading system for computer graphic system, eliminates expired primitives having bottom value greater than current line and re-inputs data for remaining primitive to merge circuit

摘要

A merge circuit (140) adds the data for the primitives of graphical objects, having a top Y-value (132) not lower than a current line (168). A distributor (160) eliminates an expired primitive having bottom Y-value (134) greater than the current line and outputs the data for the remaining primitives. A feedback circuit (170) re-inputs the output data to the merge circuit. An independent claim is also included for primitives loading method.