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glXUseXFont()							 glXUseXFont()

NAME
       glXUseXFont - create bitmap display lists from an X font

SYNOPSIS
       void glXUseXFont(
	       Font font,
	       int first,
	       int count,
	       int listBase );

PARAMETERS
       Specifies the font from which character glyphs are to be taken.	Speci‐
       fies the index of the first glyph to be taken.  Specifies the number of
       glyphs  to  be taken.  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,	rbear‐
       ing-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  cur‐
       rent GLX context.

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

       GLXBadContextState  is  generated if the current GLX context is in dis‐
       play-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       no longer valid.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()

								 glXUseXFont()

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