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GLXGETCONFIG(3G)		 OpenGL Manual		      GLXGETCONFIG(3G)

NAME
       glXGetConfig - return information about GLX visuals

C SPECIFICATION
       int glXGetConfig(Display * dpy, XVisualInfo * vis, int attrib,
			int * value);

PARAMETERS
       dpy
	   Specifies the connection to the X server.

       vis
	   Specifies the visual to be queried. It is a pointer to an
	   XVisualInfo structure, not a visual ID or a pointer to a Visual.

       attrib
	   Specifies the visual attribute to be returned.

       value
	   Returns the requested value.

DESCRIPTION
       glXGetConfig sets value to the attrib value of windows or GLX pixmaps
       created with respect to vis.  glXGetConfig returns an error code if it
       fails for any reason. Otherwise, zero is returned.

       attrib is one of the following:

       GLX_USE_GL

	   True if OpenGL rendering is supported by this visual, False
	   otherwise.

       GLX_BUFFER_SIZE
	   Number of bits per color buffer. For RGBA visuals, GLX_BUFFER_SIZE
	   is the sum of GLX_RED_SIZE, GLX_GREEN_SIZE, GLX_BLUE_SIZE, and
	   GLX_ALPHA_SIZE. For color index visuals, GLX_BUFFER_SIZE is the
	   size of the color indexes.

       GLX_LEVEL
	   Frame buffer level of the visual. Level zero is the default frame
	   buffer. Positive levels correspond to frame buffers that overlay
	   the default buffer, and negative levels correspond to frame buffers
	   that underlay the default buffer.

       GLX_RGBA

	   True if color buffers store red, green, blue, and alpha values.
	   False if they store color indexes.

       GLX_DOUBLEBUFFER

	   True if color buffers exist in front/back pairs that can be
	   swapped, False otherwise.

       GLX_STEREO

	   True if color buffers exist in left/right pairs, False otherwise.

       GLX_AUX_BUFFERS
	   Number of auxiliary color buffers that are available. Zero
	   indicates that no auxiliary color buffers exist.

       GLX_RED_SIZE
	   Number of bits of red stored in each color buffer. Undefined if
	   GLX_RGBA is False.

       GLX_GREEN_SIZE
	   Number of bits of green stored in each color buffer. Undefined if
	   GLX_RGBA is False.

       GLX_BLUE_SIZE
	   Number of bits of blue stored in each color buffer. Undefined if
	   GLX_RGBA is False.

       GLX_ALPHA_SIZE
	   Number of bits of alpha stored in each color buffer. Undefined if
	   GLX_RGBA is False.

       GLX_DEPTH_SIZE
	   Number of bits in the depth buffer.

       GLX_STENCIL_SIZE
	   Number of bits in the stencil buffer.

       GLX_ACCUM_RED_SIZE
	   Number of bits of red stored in the accumulation buffer.

       GLX_ACCUM_GREEN_SIZE
	   Number of bits of green stored in the accumulation buffer.

       GLX_ACCUM_BLUE_SIZE
	   Number of bits of blue stored in the accumulation buffer.

       GLX_ACCUM_ALPHA_SIZE
	   Number of bits of alpha stored in the accumulation buffer.

       The X protocol allows a single visual ID to be instantiated with
       different numbers of bits per pixel. Windows or GLX pixmaps that will
       be rendered with OpenGL, however, must be instantiated with a color
       buffer depth of GLX_BUFFER_SIZE.

       Although a GLX implementation can export many visuals that support GL
       rendering, it must support at least one RGBA visual. This visual must
       have at least one color buffer, a stencil buffer of at least 1 bit, a
       depth buffer of at least 12 bits, and an accumulation buffer. Alpha
       bitplanes are optional in this visual. However, its color buffer size
       must be as great as that of the deepest TrueColor, DirectColor,
       PseudoColor, or StaticColor visual supported on level zero, and it must
       itself be made available on level zero.

       In addition, if the X server exports a PseudoColor or StaticColor
       visual on framebuffer level 0, a color index visual is also required on
       that level. It must have at least one color buffer, a stencil buffer of
       at least 1 bit, and a depth buffer of at least 12 bits. This visual
       must have as many color bitplanes as the deepest PseudoColor or
       StaticColor visual supported on level 0.

       Applications are best written to select the visual that most closely
       meets their requirements. Creating windows or GLX pixmaps with
       unnecessary buffers can result in reduced rendering performance as well
       as poor resource allocation.

NOTES
       XVisualInfo is defined in Xutil.h.  It is a structure that includes
       visual, visualID, screen, and depth elements.

ERRORS
       GLX_NO_EXTENSION is returned if dpy does not support the GLX extension.

       GLX_BAD_SCREEN is returned if the screen of vis does not correspond to
       a screen.

       GLX_BAD_ATTRIBUTE is returned if attrib is not a valid GLX attribute.

       GLX_BAD_VISUAL is returned if vis doesn't support GLX and an attribute
       other than GLX_USE_GL is requested.

SEE ALSO
       glXChooseVisual(), glXCreateContext()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		      GLXGETCONFIG(3G)

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