1GLXUSEXFONT(3G)                  OpenGL Manual                 GLXUSEXFONT(3G)
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NAME

6       glXUseXFont - create bitmap display lists from an X font
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C SPECIFICATION

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

12       font
13           Specifies the font from which character glyphs are to be taken.
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15       first
16           Specifies the index of the first glyph to be taken.
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18       count
19           Specifies the number of glyphs to be taken.
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21       listBase
22           Specifies the index of the first display list to be generated.
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DESCRIPTION

25       glXUseXFont generates count display lists, named listBase through
26       listBase + count - 1, each containing a single glBitmap() command. The
27       parameters of the glBitmap() command of display list listBase + i are
28       derived from glyph first + i. Bitmap parameters xorig, yorig, width,
29       and height are computed from font metrics as descent - 1, - lbearing,
30       rbearing - lbearing, and ascent + descent, respectively.  xmove is
31       taken from the glyph's width metric, and ymove is set to zero. Finally,
32       the glyph's image is converted to the appropriate format for
33       glBitmap().
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35       Using glXUseXFont may be more efficient than accessing the X font and
36       generating the display lists explicitly, both because the display lists
37       are created on the server without requiring a round trip of the glyph
38       data, and because the server may choose to delay the creation of each
39       bitmap until it is accessed.
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41       Empty display lists are created for all glyphs that are requested and
42       are not defined in font.  glXUseXFont is ignored if there is no current
43       GLX context.
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ERRORS

46       BadFont is generated if font is not a valid font.
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48       GLXBadContextState is generated if the current GLX context is in
49       display-list construction mode.
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51       GLXBadCurrentWindow is generated if the drawable associated with the
52       current context of the calling thread is a window, and that window is
53       no longer valid.
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SEE ALSO

56       glBitmap(), glXMakeCurrent()
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59       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
60       under the SGI Free Software B License. For details, see
61       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

64       opengl.org
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68opengl.org                        07/13/2018                   GLXUSEXFONT(3G)
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