glxgetconfig man page on Solaris

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GLXGETCONFIG(3gl)					     GLXGETCONFIG(3gl)

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 XVi‐
	       sualInfo 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 visu‐
			     als, 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 corre‐
			     spond  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 avail‐
			     able.   Zero  indicates  that  no auxiliary color
			     buffers exist.

       GLX_RED_SIZE	     Number of bits of red stored in each  color  buf‐
			     fer.  Undefined if GLX_RGBA is False.

       GLX_GREEN_SIZE	     Number of bits of green stored in each color buf‐
			     fer.  Undefined if GLX_RGBA is False.

       GLX_BLUE_SIZE	     Number of bits of blue stored in each color  buf‐
			     fer.  Undefined if GLX_RGBA is False.

       GLX_ALPHA_SIZE	     Number of bits of alpha stored in each color buf‐
			     fer.  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 accumula‐
			     tion 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 accumula‐
			     tion buffer.

       GLX_X_VISUAL_TYPE_EXT X visual class.

       GLX_TRANSPARENT_TYPE_EXT
			     GLX_NONE_EXT if this visual does  not  support  a
			     transparent   pixel,  GLX_TRANSPARENT_RGB_EXT  if
			     this visual supports a RGB transparent pixel, and
			     GLX_TRANSPARENT_INDEX_EXT	an  index  transparent
			     pixel.

       GLX_TRANSPARENT_INDEX_VALUE_EXT
			     Color index value of  a  transparent  pixel  when
			     GLX_TRANSPARENT_TYPE_EXT is index.

       GLX_TRANSPARENT_RED_VALUE_EXT
			     Red  pixel	 value	of  a  transparent  pixel when
			     GLX_TRANSPARENT_TYPE_EXT is RGB.

       GLX_TRANSPARENT_GREEN_VALUE_EXT
			     Green pixel value of  a  transparent  pixel  when
			     GLX_TRANSPARENT_TYPE_EXT is RGB.

       GLX_TRANSPARENT_BLUE_VALUE_EXT
			     Blue  pixel  value	 of  a	transparent pixel when
			     GLX_TRANSPARENT_TYPE_EXT is RGB.

       GLX_TRANSPARENT_ALPHA_VALUE_EXT
			     For future expansion.

       GLX_SAMPLE_BUFFERS_ARB
			     1 if multi-sampling is enabled, 0 otherwise.

       GLX_SAMPLES_ARB	     Number of samples per pixel.

       GLX_VIDEO_RESIZE_SUN  1 if visual is capable of video resizing, 0  oth‐
			     erwise.

       GLX_VIDEO_REFRESH_TIME_SUN
			     Video refresh time in microseconds.

       GLX_GAMMA_VALUE_SUN   Visual  gamma correction value in percent (e.g. a
			     value of 180 means a gamma	 correction  value  of
			     1.80).

       The  X  protocol allows a single visual ID to be instantiated with dif‐
       ferent 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, Pseudo‐
       Color, 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 vis‐
       ual 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 Static‐
       Color 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 unnec‐
       essary 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.

       The visual attributes GLX_X_VISUAL_TYPE_EXT,  GLX_TRANSPARENT_TYPE_EXT,
       GLX_TRANSPARENT_INDEX_VALUE_EXT,		GLX_TRANSPARENT_RED_VALUE_EXT,
       GLX_TRANSPARENT_GREEN_VALUE_EXT,	 GLX_TRANSPARENT_BLUE_VALUE_EXT,   and
       GLX_TRANSPARENT_ALPHA_VALUE_EXT	are  only valid if the connection sup‐
       ports GLX_EXT_visual_info extension.

       The	 visual	      attributes       GLX_VIDEO_RESIZE_SUN	   and
       GLX_VIDEO_REFRESH_TIME_SUN  are	only  valid if the connection supports
       GLX_SUN_video_resize extension.

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, glXQueryExtensionString, glXCreateContext

				   21 May 01		     GLXGETCONFIG(3gl)
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