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NAME
     glXUseXFont - create bitmap display lists from an X font


C SPECIFICATION
     void glXUseXFont( Font font,
                       int first,
                       int count,
                       int listBase )


PARAMETERS
     font      Specifies the font from which character glyphs are
               to be taken.

     first     Specifies the index  of  the  first  glyph  to  be
               taken.

     count     Specifies the number of glyphs to be taken.

     listBase  Specifies the index of the first display  list  to
               be generated.

DESCRIPTION
     glXUseXFont generates count display  lists,  named  listBase
     through  listBase+count-1, each containing a single glBitmap
     command.  The parameters of the glBitmap command of  display
     list  listBase+i  are  derived  from  glyph first+i.  Bitmap
     parameters xorig, yorig, width, and height are computed from
     font metrics as descent-1, -lbearing, rbearing-lbearing, and
     ascent+descent,  respectively.   xmove  is  taken  from  the
     glyph's  width  metric,  and ymove is set to zero.  Finally,
     the glyph's image is converted to the appropriate format for
     glBitmap.

     Using glXUseXFont may be more efficient than accessing the X
     font  and  generating  the  display  lists  explicitly, both
     because the display lists are created on the server  without
     requiring  a  round  trip of the glyph data, and because the
     server may choose to delay the creation of each bitmap until
     it is accessed.

     Empty display lists are created  for  all  glyphs  that  are
     requested  and  are  not  defined  in  font.  glXUseXFont is
     ignored if there is no current GLX context.

ERRORS
     BadFont is generated if font is not a valid font.

     GLXBadContextState is generated if the current  GLX  context
     is in display-list construction mode.

     GLXBadCurrentWindow is generated if the drawable  associated
     with  the current context of the calling thread is a window,
     and that window is no longer valid.

SEE ALSO
     glBitmap, glXMakeCurrent

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