glLineStipple man page on RedHat
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GLLINESTIPPLE(3G) OpenGL Manual GLLINESTIPPLE(3G)
NAME
glLineStipple - specify the line stipple pattern
C SPECIFICATION
void glLineStipple(GLint factor, GLushort pattern);
PARAMETERS
factor
Specifies a multiplier for each bit in the line stipple pattern. If
factor is 3, for example, each bit in the pattern is used three
times before the next bit in the pattern is used. factor is
clamped to the range [1, 256] and defaults to 1.
pattern
Specifies a 16-bit integer whose bit pattern determines which
fragments of a line will be drawn when the line is rasterized. Bit
zero is used first; the default pattern is all 1's.
DESCRIPTION
Line stippling masks out certain fragments produced by rasterization;
those fragments will not be drawn. The masking is achieved by using
three parameters: the 16-bit line stipple pattern pattern, the repeat
count factor, and an integer stipple counter s.
Counter s is reset to 0 whenever glBegin() is called and before each
line segment of a glBegin()(GL_LINES)/glEnd() sequence is generated. It
is incremented after each fragment of a unit width aliased line segment
is generated or after each i fragments of an i width line segment are
generated. The i fragments associated with count s are masked out if
pattern bit s factor % 16
is 0, otherwise these fragments are sent to the frame buffer. Bit zero
of pattern is the least significant bit.
Antialiased lines are treated as a sequence of 1 × width rectangles for
purposes of stippling. Whether rectangle s is rasterized or not depends
on the fragment rule described for aliased lines, counting rectangles
rather than groups of fragments.
To enable and disable line stippling, call glEnable() and glDisable()
with argument GL_LINE_STIPPLE. When enabled, the line stipple pattern
is applied as described above. When disabled, it is as if the pattern
were all 1's. Initially, line stippling is disabled.
ERRORS
GL_INVALID_OPERATION is generated if glLineStipple is executed between
the execution of glBegin() and the corresponding execution of glEnd().
ASSOCIATED GETS
glGet() with argument GL_LINE_STIPPLE_PATTERN
glGet() with argument GL_LINE_STIPPLE_REPEAT
glIsEnabled() with argument GL_LINE_STIPPLE
SEE ALSO
glLineWidth(), glPolygonStipple()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLLINESTIPPLE(3G)
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