Method and apparatus for rasterizing in a hierarchical tile order
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United States of America Patent
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Aug 26, 2003
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N/A
app pub date -
Sep 2, 1998
filing date -
Jul 2, 1998
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Abstract
A method and apparatus for efficiently rasterizing graphics is provided. The method is intended to be used in combination with a frame buffer that provides fast tile-based addressing. Within this environment, frame buffer memory locations are organized into a tile hierarchy. For this hierarchy, smaller low-level tiles combine to form larger mid-level tiles. Mid-level tiles combine to form high-level tiles. The tile hierarchy may be expanded to include more levels, or collapsed to included fewer levels. A graphics primitive is rasterized by selecting an starting vertex. The low-level tile that includes the starting vertex is then rasterized. The remaining low-level tiles that are included in the same mid-level tile as the starting vertex are then rasterized. Rasterization continues with the mid-level tiles that are included in the same high-level tile as the starting vertex. These mid-level tiles are rasterized by rasterizing their component low-level tiles. The rasterization process proceeds bottom-up completing at each lower level before completing at higher levels. In this way, the present invention provides a method for rasterizing graphics primitives that accesses memory tiles in an orderly fashion. This reduces page misses within the frame buffer and enhances graphics performance.
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Patent Owner(s)
- MICROSOFT TECHNOLOGY LICENSING, LLC
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Hussain, Zahid S | San Carlos, CA | 16 | 757 |
Millet, Timothy J | Palo Alto, CA | 78 | 1539 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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