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GLXGETFBCONFIGATTRIB(3G)		  OpenGL Manual 		 GLXGETFBCONFIGATTRIB(3G)

NAME
       glXGetFBConfigAttrib - return information about a GLX frame buffer configuration

C SPECIFICATION
       int glXGetFBConfigAttrib(Display * dpy, GLXFBConfig config, int attribute, int * value);

PARAMETERS
       dpy
	   Specifies the connection to the X server.

       config
	   Specifies the GLX frame buffer configuration to be queried.

       attribute
	   Specifies the attribute to be returned.

       value
	   Returns the requested value.

DESCRIPTION
       glXGetFBConfigAttrib sets value to the attribute value of GLX drawables created with
       respect to config.  glXGetFBConfigAttrib returns an error code if it fails for any reason.
       Otherwise, Success is returned.

       attribute is one of the following:

       GLX_FBCONFIG_ID
	   XID of the given GLXFBConfig.

       GLX_BUFFER_SIZE

	   Number of bits per color buffer. If the frame buffer configuration supports RGBA
	   contexts, then GLX_BUFFER_SIZE is the sum of GLX_RED_SIZE, GLX_GREEN_SIZE,
	   GLX_BLUE_SIZE, and GLX_ALPHA_SIZE. If the frame buffer configuration supports only
	   color index contexts, GLX_BUFFER_SIZE is the size of the color indexes.

       GLX_LEVEL

	   Frame buffer level of the configuration. 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 underlie the default buffer.

       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 RGBA contexts are not
	   supported by the frame buffer configuration.

       GLX_GREEN_SIZE

	   Number of bits of green stored in each color buffer. Undefined if RGBA contexts are
	   not supported by the frame buffer configuration.

       GLX_BLUE_SIZE

	   Number of bits of blue stored in each color buffer. Undefined if RGBA contexts are not
	   supported by the frame buffer configuration.

       GLX_ALPHA_SIZE

	   Number of bits of alpha stored in each color buffer. Undefined if RGBA contexts are
	   not supported by the frame buffer configuration.

       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.

       GLX_RENDER_TYPE

	   Mask indicating what type of GLX contexts can be made current to the frame buffer
	   configuration. Valid bits are GLX_RGBA_BIT and GLX_COLOR_INDEX_BIT.

       GLX_DRAWABLE_TYPE

	   Mask indicating what drawable types the frame buffer configuration supports. Valid
	   bits are GLX_WINDOW_BIT, GLX_PIXMAP_BIT, and GLX_PBUFFER_BIT.

       GLX_X_RENDERABLE

	   True if drawables created with the frame buffer configuration can be rendered to by X.

       GLX_VISUAL_ID

	   XID of the corresponding visual, or zero if there is no associated visual (i.e., if
	   GLX_X_RENDERABLE is False or GLX_DRAWABLE_TYPE does not have the GLX_WINDOW_BIT bit
	   set).

       GLX_X_VISUAL_TYPE

	   Visual type of associated visual. The returned value will be one of: GLX_TRUE_COLOR,
	   GLX_DIRECT_COLOR, GLX_PSEUDO_COLOR, GLX_STATIC_COLOR, GLX_GRAY_SCALE, GLX_STATIC_GRAY,
	   or GLX_NONE, if there is no associated visual (i.e., if GLX_X_RENDERABLE is False or
	   GLX_DRAWABLE_TYPE does not have the GLX_WINDOW_BIT bit set).

       GLX_CONFIG_CAVEAT

	   One of GLX_NONE, GLX_SLOW_CONFIG, or GLX_NON_CONFORMANT_CONFIG, indicating that the
	   frame buffer configuration has no caveats, some aspect of the frame buffer
	   configuration runs slower than other frame buffer configurations, or some aspect of
	   the frame buffer configuration is nonconformant, respectively.

       GLX_TRANSPARENT_TYPE

	   One of GLX_NONE, GLX_TRANSPARENT_RGB, GLX_TRANSPARENT_INDEX, indicating that the frame
	   buffer configuration is opaque, is transparent for particular values of red, green,
	   and blue, or is transparent for particular index values, respectively.

       GLX_TRANSPARENT_INDEX_VALUE

	   Integer value between 0 and the maximum frame buffer value for indices, indicating the
	   transparent index value for the frame buffer configuration. Undefined if
	   GLX_TRANSPARENT_TYPE is not GLX_TRANSPARENT_INDEX.

       GLX_TRANSPARENT_RED_VALUE

	   Integer value between 0 and the maximum frame buffer value for red, indicating the
	   transparent red value for the frame buffer configuration. Undefined if
	   GLX_TRANSPARENT_TYPE is not GLX_TRANSPARENT_RGB.

       GLX_TRANSPARENT_GREEN_VALUE

	   Integer value between 0 and the maximum frame buffer value for green, indicating the
	   transparent green value for the frame buffer configuration. Undefined if
	   GLX_TRANSPARENT_TYPE is not GLX_TRANSPARENT_RGB.

       GLX_TRANSPARENT_BLUE_VALUE

	   Integer value between 0 and the maximum frame buffer value for blue, indicating the
	   transparent blue value for the frame buffer configuration. Undefined if
	   GLX_TRANSPARENT_TYPE is not GLX_TRANSPARENT_RGB.

       GLX_TRANSPARENT_ALPHA_VALUE

	   Integer value between 0 and the maximum frame buffer value for alpha, indicating the
	   transparent blue value for the frame buffer configuration. Undefined if
	   GLX_TRANSPARENT_TYPE is not GLX_TRANSPARENT_RGB.

       GLX_MAX_PBUFFER_WIDTH

	   The maximum width that can be specified to glXCreatePbuffer().

       GLX_MAX_PBUFFER_HEIGHT

	   The maximum height that can be specified to glXCreatePbuffer().

       GLX_MAX_PBUFFER_PIXELS

	   The maximum number of pixels (width times height) for a pixel buffer. Note that this
	   value may be less than GLX_MAX_PBUFFER_WIDTH times GLX_MAX_PBUFFER_HEIGHT. Also, this
	   value is static and assumes that no other pixel buffers or X resources are contending
	   for the frame buffer memory. As a result, it may not be possible to allocate a pixel
	   buffer of the size given by GLX_MAX_PBUFFER_PIXELS.

       Applications should choose the frame buffer configuration that most closely meets their
       requirements. Creating windows, GLX pixmaps, or GLX pixel buffers with unnecessary buffers
       can result in reduced rendering performance as well as poor resource allocation.

NOTES
       glXGetFBConfigAttrib is available only if the GLX version is 1.3 or greater.

       If the GLX version is 1.1 or 1.0, the GL version must be 1.0. If the GLX version is 1.2,
       then the GL version must be 1.1. If the GLX version is 1.3, then the GL version must be
       1.2.

ERRORS
       GLX_NO_EXTENSION is returned if dpy does not support the GLX extension.	GLX_BAD_ATTRIBUTE
       is returned if attribute is not a valid GLX attribute.

SEE ALSO
       glXGetFBConfigs(), glXChooseFBConfig(), glXGetVisualFromFBConfig(), glXGetConfig()

COPYRIGHT
       Copyright (C) 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				    06/10/2014			 GLXGETFBCONFIGATTRIB(3G)
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