PARAMETERS
       width  Specifies the width of rasterized lines.  The initial value is 1.

DESCRIPTION
       glLineWidth  specifies  the  rasterized  width  of  both aliased and an‐
       tialiased lines.  Using a line width other than 1 has different effects,
       depending  on  whether line antialiasing is enabled.  To enable and dis‐
       able 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
       |Δx|≥|Δy|, 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  imple‐
       mentation.   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,
       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  an‐
       tialiased 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.

ERRORS
       GL_INVALID_VALUE is generated if width is less than or equal to 0.

       GL_INVALID_OPERATION is generated if glLineWidth is executed between the
       execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS
       glGet with argument GL_LINE_WIDTH