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 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.
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
Counter
GL_LINES
)/glEnd
sequence is generated.
It is incremented after each fragment of a unit width aliased line segment
is generated
or after each
pattern
bit
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
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.
GL_INVALID_OPERATION
is generated if glLineStipple
is executed 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
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