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Line Stipple
void LineStipple ( int factor, ushort pattern ) ;
defines a line stipple.
pattern is an unsigned short integer. The line stipple is taken from the lowest order 16 bits of pattern. It determines
those fragments that are to be drawn when the line is rasterized.
factor is a count that is used
to modify the effective line stipple
by causing each bit in line stipple to be used factor times.
Line stippling masks certain fragments that are produced by rasterization so that they are not sent to the per-fragment stage of the GL. The masking is achieved using three parameters: the 16-bit line stipple p, the line repeat count r, and an integer stipple counter s. Let Then a fragment is produced if the bth bit of p is 1, and not produced otherwise. The bits of p are numbered with 0 being the least significant and 15 being the most significant. The initial value of s is zero; s is incremented after production of each fragment of a line segment (fragments are produced in order, beginning at the starting point and working towards the ending point). s is reset to 0 whenever a Begin occurs, and before every line segment in a group of independent segments (as specified when Begin is invoked with LINES). If the line segment has been clipped, then the value of s at the beginning of the line segment is indeterminate.
![]() ![]() ![]() ![]() ![]() Next: Wide Lines Up: 3.4.2 Other Line Segment Previous: 3.4.2 Other Line Segment David Blythe Sat Mar 29 02:23:21 PST 1997
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