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US006801214B1
(12) United States Patent ao) Patent No.: us 6,801,214 Bi
Moriwaki et al. (45) Date of Patent: Oct. 5,2004
(54) THREE-DIMENSIONAL GRAPHICS SYSTEM REDUCING COLOR DATA/BITS IN DRAWING OPERATIONS FOR FASTER PROCESSING
(75) Inventors: Shohei Moriwaki, Tokyo (JP);
Yoshifumi Azekawa, Tokyo (JP);
Osamu Chiba, Tokyo (JP)
(73) Assignee: Renesas Technology Corp., Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 328 days.
(21) Appl. No.: 09/603,916
(22) Filed: Jun. 26, 2000
(30) Foreign Application Priority Data
Dec. 27, 1999 (JP) 11-370186
(51) Int. C I. G09G 5/02
(52) U.S. CI 345/600; 345/601
(58) Field of Search 345/153-155,
345/600-605, 586; 382/162-167
(56) References Cited
U.S. PATENT DOCUMENTS
5,432,893 A * 7/1995 Blasubramanian et al. . 345/600
5,506,946 A * 4/1996 Bar et al 345/600
5,544,284 A * 8/1996 Allebach et al 345/603
5,572,636 A * 11/1996 Sakuraba et al 345/586
5,838,389 A * 11/1998 Mical et al 345/602
5,930,387 A * 7/1999 Chan et al 382/166
An object is to obtain a three-dimensional graphics system capable ol color display with reduced operation time. A color data transform portion (2A) extracts the upper k (k<n) bits from n bits for each ol R, G and B in RGB original color data (CI) in geometrically-processed three-dimensional data (Dl) and transforms the RGB original color data (CI) into reduced color data (C2) in such a manner that the sets ol k bits are assigned respectively to R, G and B, thus providing color data for three-dimensional data (D2) to be used in the drawing operation. A drawing operation portion (3 A) applies drawing operations including color processing operation based on the reduced color data (C2) to the threedimensional data for drawing operation (D2) obtained from the color data transform portion (2A) and outputs threedimensional graphic drawing data to a drawing unit (4). The drawing unit (4) displays three-dimensional graphics in color on a display screen in a display unit.
7 Claims, 8 Drawing Sheets
