Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1996-05-01
1998-06-09
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
G06F 1500
Patent
active
057642281
ABSTRACT:
A 3D graphics system in which a pre-rendering stage is combined with a rendering stage. Any GUI window which is not completely displayed on-screen (because it extends past screen boundaries or is overlapped by other windows, etc.), is divided into at least two portions, e.g. rectangles, for scissoring operations. If a primitive appears at least partially in some rectangle, rendering setup data is calculated, then applied against each rectangle in which it appears for a scissoring operation, and the portion of the primitive in that rectangle which survives the scissor is then rendered. The rendering data is stored between each scissoring function, and is not recalculated. Any portion of the primitive which does not appear in a rectangle is not rendered, thereby eliminating any rendering overhead for any primitive which would be completely hidden anyway. By computing the pre-rendering values only once for each primitive, the object of eliminating needless rendering calculations is achieved at the expense of a releatively simply scissor comparision of the stored pre-renndering data with the boundaries of each of the rectangles.
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3DLabs Inc. Ltd.
Anderson Matthew S.
Formby Betty
Groover Robert
Nguyen Phu K.
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