Z-Buffer for row addressable graphics memory with flash fill
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United States of America Patent
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-
Aug 3, 1999
Grant Date -
N/A
app pub date -
Dec 3, 1997
filing date -
Dec 3, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A Z-Buffer is added to a Row Addressable Graphics Memory With Flash Fill so that a Z (or Depth) value is supplied with each Start and End address. The Z value is calculated for each pixel between the Start and End address. This value is compared to the existing Z value for that pixel stored in the Z-Buffer. Values less than the existing value replace the Z value for that pixel in the Z-Buffer and allow the new pixel to be written into the display memory. The Z data are read, modified, and written back to the Z-Buffer in parallel thereby requiring a maximum of three memory cycles to operate on a line segment independent of the length of the line.
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