Provided by: opengl-4-man-doc_1.0~svn33624-1_all 
NAME
glLineWidth - specify the width of rasterized lines
C SPECIFICATION
void glLineWidth(GLfloat width);
PARAMETERS
width
Specifies the width of rasterized lines. The initial value is 1.
DESCRIPTION
glLineWidth specifies the rasterized width of both aliased and antialiased lines. Using a line width
other than 1 has different effects, depending on whether line antialiasing is enabled. To enable and
disable line antialiasing, call glEnable() and
glDisable with argument GL_LINE_SMOOTH. Line antialiasing is initially disabled.
If line antialiasing is disabled, the actual width is determined by rounding the supplied width to the
nearest integer. (If the rounding results in the value 0, it is as if the line width were 1.) If Δ x >= Δ
y, i pixels are filled in each column that is rasterized, where i is the rounded value of width.
Otherwise, i pixels are filled in each row that is rasterized.
If antialiasing is enabled, line rasterization produces a fragment for each pixel square that intersects
the region lying within the rectangle having width equal to the current line width, length equal to the
actual length of the line, and centered on the mathematical line segment. The coverage value for each
fragment is the window coordinate area of the intersection of the rectangular region with the
corresponding pixel square. This value is saved and used in the final rasterization step.
Not all widths can be supported when line antialiasing is enabled. If an unsupported width is requested,
the nearest supported width is used. Only width 1 is guaranteed to be supported; others depend on the
implementation. Likewise, there is a range for aliased line widths as well. To query the range of
supported widths and the size difference between supported widths within the range, call glGet() with
arguments GL_ALIASED_LINE_WIDTH_RANGE, GL_SMOOTH_LINE_WIDTH_RANGE, and GL_SMOOTH_LINE_WIDTH_GRANULARITY.
NOTES
The line width specified by glLineWidth is always returned when GL_LINE_WIDTH is queried. Clamping and
rounding for aliased and antialiased lines have no effect on the specified value.
Nonantialiased line width may be clamped to an implementation-dependent maximum. Call glGet() with
GL_ALIASED_LINE_WIDTH_RANGE to determine the maximum width.
In OpenGL 1.2, the tokens GL_LINE_WIDTH_RANGE and GL_LINE_WIDTH_GRANULARITY were replaced by
GL_ALIASED_LINE_WIDTH_RANGE, GL_SMOOTH_LINE_WIDTH_RANGE, and GL_SMOOTH_LINE_WIDTH_GRANULARITY. The old
names are retained for backward compatibility, but should not be used in new code.
ERRORS
GL_INVALID_VALUE is generated if width is less than or equal to 0.
ASSOCIATED GETS
glGet() with argument GL_LINE_WIDTH
glGet() with argument GL_ALIASED_LINE_WIDTH_RANGE
glGet() with argument GL_SMOOTH_LINE_WIDTH_RANGE
glGet() with argument GL_SMOOTH_LINE_WIDTH_GRANULARITY
glIsEnabled() with argument GL_LINE_SMOOTH
VERSION SUPPORT
┌────────────┬───────────────────────────────────────────────────────────────────────┐
│ │ OpenGL Version │
├────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
│Function │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│/ │ │ │ │ │ │ │ │ │ │ │ │ │
│Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glLineWidth │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
└────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
glEnable()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is
licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc.
Copyright © 2010-2014 Khronos Group
[FIXME: source] 01/03/2018 GLLINEWIDTH(3G)