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Green Image
Issue No. 03 - March (1987 vol. 7)
ISSN: 0272-1716
pp: 24-32
Andy Goris , Hewlett-Packard Co.
Bob Fredrickson , Hewlett-Packard Co.
Harold Baeverstad , Hewlett-Packard Co.
This article describes an approach to fast image generation that uses a high-speed serial scan converter, a somewhat slower frame buffer, and a pixel cache to match the bandwidth between the two. Cache hit rates are improved by configuring the cache to buffer either 4 × 4 or 16 × 1 tiles of frame memory, depending on the type of operation being performed. For line drawing, the implenmention discribed can process 300,000 30-pixel vectors per second. For shaded polygons, the system can fill 16,000 900-pixel polygons per second. In addition to buffering pixel intensity data, the pixel cache also buffer z (depth) values, improving the performance of the z-buffer hidden-surface algorithm. By utilizing z-value caching, the system can process 5800 900-pixel shaded polygons per second with hidden-surface removed.

H. Baeverstad, B. Fredrickson and A. Goris, "A Configurable Pixel Cache for Fast Image Generation," in IEEE Computer Graphics and Applications, vol. 7, no. , pp. 24-32, 1987.
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