Patent
1995-03-24
1997-12-23
Tung, Kee M.
395519, G06T 120
Patent
active
057014442
ABSTRACT:
A rendering subsystem with enhanced capability for handling both 2D rendering and 3D rendering tasks. Since the 2D rendering tasks may be generated by the operating system (or other user-interfacing software), it is highly desirable not to interfere with rapid performance of 2D rendering, even if substantial 3D rendering tasks have been loaded into the pipeline. To avoid this, the innovative system uses dual independent contexts, and suspends 3D rendering operation during periods of 2D rendering demand. Moreover, a certain percentage of cycles is reserved, as a minimum, to be available for 2D operations if any have been requested. Window ownership identifiers are maintained for each pixel, but these identifiers are only updated when the 3D rendering operations have been suspended. Moreover, the window position (offset) values are only updated during periods when 3D rendering has been suspended.
REFERENCES:
patent: 5371514 (1994-12-01), Lawless et al.
patent: 5392391 (1995-02-01), Caulk, Jr. et al.
patent: 5394524 (1995-02-01), DiNicola et al.
Computer Graphics Proceedings, Annual Conference Series, 1993 SIGGRAPH '93, 1-6 Aug. 1993, "Leo: A System for Cost Effective 3-D Shaded Graphics", by Deering et al, pp. 101-108.
3DLabs Inc. Ltd.
Anderson Matthew
Formby Betty
Groover Robert
Tung Kee M.
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