GLLINESTIPPLE(3G) UNIX Programmer's Manual GLLINESTIPPLE(3G)
glLineStipple - specify the line stipple pattern
void glLineStipple( GLint factor,
GLushort pattern )
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 deter-
mines 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.
Line stippling masks out certain fragments produced by ras-
terization; those fragments will not be drawn. The masking
is achieved by using three parameters: the 16-bit line stip-
ple 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) mod 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 1xwidth rec-
tangles 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.
MirOS BSD #10-current Printed 20.2.2012 1
GLLINESTIPPLE(3G) UNIX Programmer's Manual GLLINESTIPPLE(3G)
GL_INVALID_OPERATION is generated if glLineStipple is exe-
cuted between the execution of glBegin and the corresponding
execution of glEnd.
glGet with argument GL_LINE_STIPPLE_PATTERN
glGet with argument GL_LINE_STIPPLE_REPEAT
glIsEnabled with argument GL_LINE_STIPPLE
glLineWidth(3G), glPolygonStipple(3G)
MirOS BSD #10-current Printed 20.2.2012 2
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