Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Patent
1996-04-22
1998-08-04
Zimmerman, Mark K.
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
345429, G06T 1100
Patent
active
057901252
ABSTRACT:
Graphics information is efficiently transferred from a host computer to a graphics subsystem in which rendering and pixel data is generated by the host system. A masked span operation provides an assist for 3D rendering performed by the system processor of the host and other system resources. Storage of depth, alpha, stencil, and other pixel data is in system memory including one or more ancillary graphics buffers. The main processor of the host system generates pixel data associated with an image. This data is checked against the buffers. As a result of such checking, a mask is generated by the host system. The mask is transferred in burst mode across the host-graphic subsystem PCI bus to the graphics subsystem in combination with span width, and in the case of interpolated color, color base and color increment data, and X,Y coordinate of the first pixel. In the graphics subsystem the mask is employed with the other data to load the frame buffer with the portion of pixel data defined by the mask.
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Bui Thuy-Linh Tran
Johns Charles Ray
Roberson John Thomas
Spannaus John Fred
Cao Huedung X.
Carwell Robert M.
International Business Machines - Corporation
Zimmerman Mark K.
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