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]                                    07/22/2015                                    GLLINEWIDTH(3G)