Apparatus and method for texture mapping using multiple levels of detail
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United States of America Patent
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-
Apr 16, 2002
Grant Date -
N/A
app pub date -
Jun 21, 1999
filing date -
Mar 26, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Texture mapping of a primitive object uses multiple levels of detail. The primitive object is a triangle having three vertices. The pixel coordinates of the three vertices and their corresponding texture mapped coordinates satisfy three linear equations derived from the equation representing the plane on which the triangle belongs to. An equivalent formula derived from a standard formula for the multiple levels of detail can be computed by a plurality of constants forming the three linear equations. The plurality of constants are first determined by using the pixel coordinates and the corresponding texture mapped coordinates of the three vertices. By substituting the constants into the equivalent formula, the value for the multiple levels of detail can be computed. A lookup table is used to determine log.sub.2 function values that are required in the equivalent formula. The method can be realized by simple hardware and a high precision log.sub.2 lookup table to accomplish high quality texture mapping.
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