Patent ID: 6172686
Filing Date: 2001-01-09
Classification: G06T

Abstract:
A graphic processor for drawing several overlaid graphic data having a positional relation in a third depth dimension on a single two dimensional display screen of a display unit, comprising:timing generation means for outputting a drawing processing control signal, a display initialize signal, a display address signal and a drawing display switching signal for control of operation timing according to a clock signal, a vertical sync signal and a horizontal sync signal;drawing processing means which incorporates a for storage storing original data of displayed figures and, under the control of said clock signal and said drawing processing control signal, for outputting a drawing graphic data signal, a display buffer write enable signal and a display buffer drawing address signal of object figures as graphic data;selection means, under the control of said drawing display switching signal output from said timing generation means, for selecting either said display buffer drawing address signal output from said drawing processing means or said display address signal output from said timing generation means and outputting the selected signal as a display buffer address signal;display buffer means for inputting said clock signal, said drawing graphic data signal and said display buffer write enable signal and said display buffer address signal and, according to said clock signal and said display buffer address signal, outputting the display data signal;status register means for inputting said clock signal, said display initialize signal and said display buffer address signal and, being reset under control of said display initialize signal and outputting a mask signal corresponding to said display buffer address signal; andmask means for inputting said display data signal and said mask signal output from said status register means and, under the control of said mask signal, outputting a post-masking display data signal with providing necessary masks to said display data signal to said display unit.