Computer graphics acceleration method and apparatus for evaluating whether points are inside a triangle
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United States of America Patent
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Aug 7, 2007
Grant Date -
Feb 5, 2004
app pub date -
Mar 7, 2003
filing date -
Mar 11, 2002
priority date (Note) -
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Abstract
A computer graphics accelerator apparatus and method determines whether a pixel at predetermined pixel co-ordinates in an area being rasterized is within a triangle defining a sub-area of the area. The coordinate system in relation to which the triangle is defined is translated such that the pixel co-ordinates are disposed at the origin of the coordinate system. Determinants of matrices based on at least two of the coordinate values of at least two of the vertices are calculated and their signs compared. Based on this comparison a determination as to pixel location with respect to the triangle may be made.
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