US 5,844,576 AGranted

Tiled linear host texture storage

AssigneeCirrus Logic, Inc.

InventorsDaniel P. Wilde, Timothy J. McDonald

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Abstract

A process and implementing computer system for graphics applications in which polygon information, including transparency, color and other polygon characteristics, is organized, stored and transferred in terms of areas or tiled blocks of information in a matrix configuration. The polygon bytes of texel information are organized in an exemplary 8.times.8 matrix row and column format in the graphics subsystem for improved cache-hit efficiency and translated to and from the linear addressing scheme of a host storage device when the host storage is accessed to refill the graphics cache. The bytes comprising the memory tiles of polygon information are arranged such that a complete tile of information is transferred in one burst-mode host memory access to minimize normal multi-line access arbitration and other typical access delays.

Claims20

Dependent claims

A method for organizing blocks of display-related information, said display-related information being representative of at least one characteristic of a plurality of image pixels defining an image to be presented on a screen of a display device, said display device being operated in conjunction with an information processing system, said method including the steps of:

dividing said image pixels into image pixel blocks, each of said image pixel blocks being comprised of a first predetermined number of lines of image pixel bytes of said display-related information, and a second predetermined number of columns of image pixel bytes of said display-related information, said first predetermined number being greater than one, each of said image pixel blocks containing data capable of describing a block section covering a predetermined horizontal portion of at least two vertically displaced lines of a texture image;
and
designating said image pixel blocks into rows of image pixel blocks, said rows being displaced vertically to cover said screen of said display device.

A graphics station, including an information processing system comprising a main bus and a display device, and a graphics subsystem, said graphics subsystem comprising a graphics processor device connected to said main bus and to said display device, said graphics subsystem further including a graphics memory coupled to said graphics processor, said graphics subsystem being selectively operable for storing and processing information representative of an object to be drawn on the display device, said graphics subsystem being selectively operable for organizing blocks of display-related information, said display-related information being representative of at least one characteristic of a plurality of image pixels defining an image to be presented on a screen of said display device, said graphics subsystem being selectively operable to accomplish the steps of:

dividing said image pixels into image pixel blocks, each of said image pixel blocks being comprised of a first predetermined number of lines of image pixel bytes of said display-related information, and a second predetermined number of columns of image pixel bytes of said display-related information, said first predetermined number being greater than one, each of said image pixel blocks containing data capable of describing a block section covering a predetermined horizontal portion of at least two vertically displaced lines of a texture image;
and
designating said image pixel blocks into rows of image pixel blocks, said rows being displaced vertically to cover said screen of said display device.

Dependencies are inferred from the claim text.