glutCopyColormap  -  copies  the  logical colormap for the
layer in use from a specified window to the  current  win-
dow.

glutCopyColormap
	glutCopyColormap(win) -> None

void glutCopyColormap(int win);

win       The identifier of the window to copy the logical
          colormap from.

glutCopyColormap copies (lazily  if  possible  to  promote
sharing)  the  logical colormap from a specified window to
the current window's layer in use. The copy will  be  from
the  normal plane to the normal plane; or from the overlay
to the overlay (never across  different  layers).  Once  a
colormap  has been copied, avoid setting cells in the col-
ormap with glutSetColor since that will  force  an  actual
copy of the colormap if it was previously copied by refer-
ence. glutCopyColormap should only be called when both the
current window and the win window are color index windows.

Here is an example of how to create two color  index  GLUT
windows  with  their  colormaps  loaded identically and so
that the windows are likely to share the same colormap:

  int win1, win2;

  glutInitDisplayMode(GLUT_INDEX);
  win1 = glutCreateWindow("first color index win");
  glutSetColor(0, 0.0, 0.0, 0.0);  /* black */
  glutSetColor(1, 0.5, 0.5, 0.5);  /* gray */
  glutSetColor(2, 1.0, 1.0, 1.0);  /* black */
  glutSetColor(3, 1.0, 0.0, 0.0);  /* red */
  win2 = glutCreateWindow("second color index win");
  glutCopyColormap(win1);

glutSetColor, glutGetColor, glutCreateWindow

Mark J. Kilgard (mjk@nvidia.com)