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glGet(3G)							     glGet(3G)

NAME
       glGet, glGetBooleanv, glGetDoublev, glGetFloatv, glGetIntegerv - return
       the value or values of a selected parameter

SYNOPSIS
       void glGetBooleanv(
	       GLenum pname,
	       GLboolean *params ); void glGetDoublev(
	       GLenum pname,
	       GLdouble *params ); void glGetFloatv(
	       GLenum pname,
	       GLfloat *params ); void glGetIntegerv(
	       GLenum pname,
	       GLint *params );

PARAMETERS
       Specifies the parameter value to be returned. The symbolic constants in
       the list below are accepted.  Returns the value or values of the speci‐
       fied parameter.

DESCRIPTION
       These four commands return values for simple  state  variables  in  GL.
       pname  is  a  symbolic  constant	 indicating  the  state variable to be
       returned, and params is a pointer to an array of the indicated type  in
       which to place the returned data.

       Type  conversion	 is  performed if params has a different type than the
       state variable value being requested. If glGetBooleanv() is  called,  a
       floating-point  (or integer) value is converted to GL_FALSE if and only
       if it is 0.0 (or 0).  Otherwise, it is converted to GL_TRUE. If	glGet‐
       Integerv()  is  called,	boolean	 values	 are  returned	as  GL_TRUE or
       GL_FALSE, and most floating-point values are  rounded  to  the  nearest
       integer value. Floating-point colors and normals, however, are returned
       with a linear mapping that maps 1.0 to the most positive	 representable
       integer	value,	and  -1.0  to  the most negative representable integer
       value.  If glGetFloatv() or glGetDoublev() is  called,  boolean	values
       are  returned  as GL_TRUE or GL_FALSE, and integer values are converted
       to floating-point values.

       The following symbolic constants are accepted by pname: params  returns
       one  value,  the	 number of alpha bitplanes in the accumulation buffer.
       params returns one value, the number of blue bitplanes in the accumula‐
       tion  buffer.   params  returns	four values: the red, green, blue, and
       alpha values used to clear the accumulation buffer. Integer values,  if
       requested,  are linearly mapped from the internal floating-point repre‐
       sentation such that 1.0 returns the most positive representable integer
       value,  and -1.0 returns the most negative representable integer value.
       The initial value is (0, 0, 0, 0). See glClearAccum().  params  returns
       one  value,  the	 number of green bitplanes in the accumulation buffer.
       params returns one value, the number of red bitplanes in the  accumula‐
       tion  buffer.  params returns a single value indicating the active mul‐
       titexture unit. The initial value is GL_TEXTURE0_ARB. See  glActiveTex‐
       tureARB().   params  returns  two values, the smallest and largest sup‐
       ported sizes for aliased points.	 params returns two values, the small‐
       est and largest supported widths for aliased lines.  params returns one
       value, the alpha bias factor used during pixel transfers.  The  initial
       value  is 0. See glPixelTransfer().  params returns one value, the num‐
       ber of alpha bitplanes in each color buffer.  params returns one value,
       the  alpha  scale factor used during pixel transfers. The initial value
       is 1. See glPixelTransfer().  params returns  a	single	boolean	 value
       indicating  whether  alpha testing of fragments is enabled. The initial
       value is GL_FALSE.  See glAlphaFunc().  params returns one  value,  the
       symbolic	 name  of  the	alpha  test  function.	The  initial  value is
       GL_ALWAYS. See glAlphaFunc().  params returns one value, the  reference
       value for the alpha test. The initial value is 0. See glAlphaFunc(). An
       integer value, if requested,  is	 linearly  mapped  from	 the  internal
       floating-point  representation  such that 1.0 returns the most positive
       representable integer value, and -1.0 returns the most negative	repre‐
       sentable	 integer  value.   params  returns one value, the depth of the
       attribute stack.	 If the stack is empty, 0  is  returned.  The  initial
       value  is 0. See glPushAttrib().	 params returns a single boolean value
       indicating whether 2D map evaluation  automatically  generates  surface
       normals.	 The  initial value is GL_FALSE. See glMap2().	params returns
       one value, the number of auxiliary color buffers.  The initial value is
       0.   params  returns a single boolean value indicating whether blending
       is enabled. The initial value is GL_FALSE. See  glBlendFunc().	params
       returns	four  values, the red, green, blue, and alpha values which are
       the components of the blend color. See glBlendColor().  params  returns
       one  value,  the	 symbolic  constant  identifying the destination blend
       function. The initial value is  GL_ZERO.	  See  glBlendFunc().	params
       returns	one  value,  a	symbolic constant indicating whether the blend
       equation is  GL_FUNC_ADD,  GL_MIN  or  GL_MAX.  See  glBlendEquation().
       params  returns one value, the symbolic constant identifying the source
       blend function.	The  initial  value  is	 GL_ONE.   See	glBlendFunc().
       params returns one value, the blue bias factor used during pixel trans‐
       fers. The initial value is 0. See  glPixelTransfer().   params  returns
       one  value,  the number of blue bitplanes in each color buffer.	params
       returns one value, the blue scale factor used during  pixel  transfers.
       The initial value is 1. See glPixelTransfer().  params returns a single
       integer value indicating the current client active  multitexture	 unit.
       The  initial  value is GL_TEXTURE0_ARB. See glClientActiveTextureARB().
       params returns one value indicating the depth of the  attribute	stack.
       The  initial  value  is	0. See glPushClientAttrib().  params returns a
       single boolean value indicating whether the specified clipping plane is
       enabled.	 The  initial  value  is  GL_FALSE. See glClipPlane().	params
       returns a single boolean value indicating whether the  color  array  is
       enabled.	 The initial value is GL_FALSE.	 See glColorPointer().	params
       returns one value, the number of components  per	 color	in  the	 color
       array.  The  initial  value is 4. See glColorPointer().	params returns
       one value, the byte offset between  consecutive	colors	in  the	 color
       array.  The  initial  value is 0. See glColorPointer().	params returns
       one value, the data type of each component in the color array. The ini‐
       tial value is GL_FLOAT. See glColorPointer().  params returns four val‐
       ues: the red, green, blue, and alpha values used	 to  clear  the	 color
       buffers.	 Integer  values,  if  requested, are linearly mapped from the
       internal floating-point representation such that 1.0 returns  the  most
       positive	 representable	integer value, and -1.0 returns the most nega‐
       tive representable integer value. The initial value is (0,  0,  0,  0).
       See  glClearColor().   params returns a single boolean value indicating
       whether a fragment's RGBA color values are merged into the  framebuffer
       using  a logical operation.  The initial value is GL_FALSE. See glLogi‐
       cOp().  params returns a single boolean value indicating whether one or
       more  material  parameters  are tracking the current color. The initial
       value is GL_FALSE. See glColorMaterial().  params returns one value,  a
       symbolic	 constant  indicating which materials have a parameter that is
       tracking the current color. The initial value is GL_FRONT_AND_BACK. See
       glColorMaterial().  params returns one value, a symbolic constant indi‐
       cating which material parameters are tracking the  current  color.  The
       initial value is GL_AMBIENT_AND_DIFFUSE. See glColorMaterial().	params
       returns sixteen values: the color matrix on the top of the color matrix
       stack.  Initially  this	matrix	is  the identity matrix. See glPushMa‐
       trix().	params returns one value, the maximum supported depth  of  the
       projection  matrix  stack.  The value must be at least 2. See glPushMa‐
       trix().	params returns a single boolean value indicating  whether  the
       color table lookup is enabled. See glColorTable().  params returns four
       boolean values: the red, green, blue, and alpha write enables  for  the
       color  buffers.	The  initial  value  is	 (GL_TRUE,  GL_TRUE,  GL_TRUE,
       GL_TRUE). See glColorMask().  params returns  a	single	boolean	 value
       indicating  whether  1D	convolution  is	 enabled. The initial value is
       GL_FALSE.  See glConvolutionFilter1D().	params returns a single	 bool‐
       ean  value  indicating  whether	2D convolution is enabled. The initial
       value is GL_FALSE.  See glConvolutionFilter2D().	 params returns a sin‐
       gle  boolean  value  indicating whether polygon culling is enabled. The
       initial value is GL_FALSE. See glCullFace().  params returns one value,
       a  symbolic  constant  indicating which polygon faces are to be culled.
       The initial value is GL_BACK.  See glCullFace().	 params	 returns  four
       values:	the  red,  green, blue, and alpha values of the current color.
       Integer values, if requested, are linearly  mapped  from	 the  internal
       floating-point  representation  such that 1.0 returns the most positive
       representable integer value, and -1.0 returns the most negative	repre‐
       sentable	 integer  value. See glColor(). The initial value is (1, 1, 1,
       1).  params returns one value, the current  color  index.  The  initial
       value  is 1. See glIndex().  params returns three values: the x, y, and
       z values of the current normal.	Integer values, if requested, are lin‐
       early  mapped from the internal floating-point representation such that
       1.0 returns the most positive representable  integer  value,  and  -1.0
       returns	the  most  negative  representable integer value.  The initial
       value is (0, 0, 1). See glNormal().  params returns  four  values:  the
       red,  green,  blue,  and	 alpha	values of the current raster position.
       Integer values, if requested, are linearly  mapped  from	 the  internal
       floating-point  representation  such that 1.0 returns the most positive
       representable integer value, and -1.0 returns the most negative	repre‐
       sentable	 integer  value.  The  initial	value  is  (1,	1,  1, 1). See
       glRasterPos().  params returns one value, the distance from the eye  to
       the current raster position. The initial value is 0. See glRasterPos().
       params returns one value, the color index of the current	 raster	 posi‐
       tion.  The  initial value is 1. See glRasterPos().  params returns four
       values: the x, y, z, and w components of the current  raster  position.
       x,  y,  and  z are in window coordinates, and w is in clip coordinates.
       The initial value is (0, 0, 0, 1). See glRasterPos().  params returns a
       single  boolean value indicating whether the current raster position is
       valid. The initial value is GL_TRUE. See glRasterPos().	params returns
       four values: the s, t, r, and q current raster texture coordinates. The
       initial value is (0, 0, 0,  1).	See  glRasterPos()  and	 glTexCoord().
       params  returns four values: the s, t, r, and q current texture coordi‐
       nates. The initial value is (0, 0, 0,  1).  See	glTexCoord().	params
       returns	one  value, the depth bias factor used during pixel transfers.
       The initial value is 0.	See  glPixelTransfer().	  params  returns  one
       value, the number of bitplanes in the depth buffer.  params returns one
       value, the value that is used to clear the depth buffer.	 Integer  val‐
       ues, if requested, are linearly mapped from the internal floating-point
       representation such that 1.0 returns the	 most  positive	 representable
       integer value, and -1.0 returns the most negative representable integer
       value. The initial value is 1. See glClearDepth().  params returns  one
       value,  the symbolic constant that indicates the depth comparison func‐
       tion. The initial value is GL_LESS.  See glDepthFunc().	params returns
       two values: the near and far mapping limits for the depth buffer. Inte‐
       ger values, if requested, are linearly mapped from the internal	float‐
       ing-point representation such that 1.0 returns the most positive repre‐
       sentable integer value, and  -1.0  returns  the	most  negative	repre‐
       sentable	  integer   value.   The   initial   value   is	 (0,  1).  See
       glDepthRange().	params returns one value, the depth scale factor  used
       during  pixel transfers. The initial value is 1. See glPixelTransfer().
       params returns a single boolean value indicating whether depth  testing
       of  fragments  is enabled. The initial value is GL_FALSE.  See glDepth‐
       Func() and glDepthRange().  params returns a single boolean value indi‐
       cating if the depth buffer is enabled for writing. The initial value is
       GL_TRUE.	 See glDepthMask().  params returns  a	single	boolean	 value
       indicating whether dithering of fragment colors and indices is enabled.
       The initial value is GL_TRUE.  params returns a	single	boolean	 value
       indicating  whether  double buffering is supported.  params returns one
       value, a symbolic constant indicating which buffers are being drawn to.
       See glDrawBuffer(). The initial value is GL_BACK if there are back buf‐
       fers, otherwise it is GL_FRONT.	params returns a single boolean	 value
       indicating whether the current edge option is GL_TRUE or GL_FALSE.  The
       initial value is GL_TRUE. See glEdgeFlag().  params  returns  a	single
       boolean	value indicating whether the edge option array is enabled. The
       initial value is GL_FALSE.  See	glEdgeFlagPointer().   params  returns
       one value, the byte offset between consecutive edge options in the edge
       option array. The initial value is 0. See glEdgeFlagPointer().	params
       returns	one  value,  the size of the feedback buffer.  See glFeedback‐
       Buffer().  params returns one value, the type of the  feedback  buffer.
       See glFeedbackBuffer().	params returns a single boolean value indicat‐
       ing whether fogging is enabled. The  initial  value  is	GL_FALSE.  See
       glFog().	  params  returns four values: the red, green, blue, and alpha
       components of the fog color. Integer values, if requested, are linearly
       mapped  from  the  internal floating-point representation such that 1.0
       returns the most positive representable integer value, and -1.0 returns
       the most negative representable integer value. The initial value is (0,
       0, 0, 0). See glFog().  params  returns	one  value,  the  fog  density
       parameter.  The	initial	 value	is 1. See glFog().  params returns one
       value, the end factor for the linear fog equation.  The	initial	 value
       is 1. See glFog().  params returns one value, a symbolic constant indi‐
       cating the mode of the fog hint. The initial value is GL_DONT_CARE. See
       glHint().   params  returns one value, the fog color index. The initial
       value is 0. See glFog().	 params returns one value, a symbolic constant
       indicating which fog equation is selected. The initial value is GL_EXP.
       See glFog().  params returns one value, the start factor for the linear
       fog  equation. The initial value is 0. See glFog().  params returns one
       value, a symbolic constant indicating  whether  clockwise  or  counter‐
       clockwise  polygon  winding  is	treated	 as front-facing.  The initial
       value is GL_CCW. See glFrontFace().   params  returns  one  value,  the
       green  bias factor used during pixel transfers. The initial value is 0.
       params returns one value, the number of green bitplanes in  each	 color
       buffer.	 params	 returns one value, the green scale factor used during
       pixel transfers. The initial value is 1. See glPixelTransfer().	params
       returns a single boolean value indicating whether histogram is enabled.
       The initial value is GL_FALSE. See  glHistogram().   params  returns  a
       single  boolean	value  indicating  whether  the	 color	index array is
       enabled. The initial value is GL_FALSE.	See glIndexPointer().	params
       returns one value, the byte offset between consecutive color indexes in
       the color index array. The initial value is  0.	See  glIndexPointer().
       params  returns	one value, the data type of indexes in the color index
       array. The initial value is  GL_FLOAT.  See  glIndexPointer().	params
       returns	one value, the number of bitplanes in each color index buffer.
       params returns one value, the color index used to clear the color index
       buffers.	 The initial value is 0. See glClearIndex().  params returns a
       single boolean value indicating whether a fragment's index  values  are
       merged  into  the  framebuffer  using  a logical operation. The initial
       value is GL_FALSE. See glLogicOp().  params returns  a  single  boolean
       value  indicating  whether  the	GL is in color index mode (GL_TRUE) or
       RGBA mode (GL_FALSE).  params returns one value, the  offset  added  to
       color  and stencil indices during pixel transfers. The initial value is
       0. See glPixelTransfer().  params returns one value,  the  amount  that
       color  and stencil indices are shifted during pixel transfers. The ini‐
       tial value is 0. See glPixelTransfer().	params returns	one  value,  a
       mask indicating which bitplanes of each color index buffer can be writ‐
       ten. The initial value is all 1's. See glIndexMask().  params returns a
       single boolean value indicating whether the specified light is enabled.
       The initial  value  is  GL_FALSE.  See  glLight()  and  glLightModel().
       params  returns	a  single boolean value indicating whether lighting is
       enabled. The initial value is  GL_FALSE.	 See  glLightModel().	params
       returns	four values: the red, green, blue, and alpha components of the
       ambient intensity of the entire scene. Integer  values,	if  requested,
       are  linearly  mapped  from  the internal floating-point representation
       such that 1.0 returns the most positive	representable  integer	value,
       and  -1.0  returns  the	most negative representable integer value. The
       initial value is (0.2, 0.2,  0.2,  1.0).	 See  glLightModel().	params
       returns	single enumerated value indicating whether specular reflection
       calculations are separated from normal lighting computations. The  ini‐
       tial  value  is GL_SINGLE_COLOR.	 params returns a single boolean value
       indicating whether specular reflection calculations treat the viewer as
       being  local  to the scene. The initial value is GL_FALSE. See glLight‐
       Model().	 params returns a single boolean value indicating whether sep‐
       arate materials are used to compute lighting for front- and back-facing
       polygons.  The initial value is GL_FALSE. See  glLightModel().	params
       returns a single boolean value indicating whether antialiasing of lines
       is enabled. The initial value is GL_FALSE. See  glLineWidth().	params
       returns	one value, a symbolic constant indicating the mode of the line
       antialiasing hint. The initial value  is	 GL_DONT_CARE.	See  glHint().
       params  returns	a single boolean value indicating whether stippling of
       lines is enabled. The initial value is GL_FALSE.	 See  glLineStipple().
       params  returns one value, the 16-bit line stipple pattern. The initial
       value is all 1's. See glLineStipple().  params returns one  value,  the
       line  stipple  repeat  factor.  The initial value is 1. See glLineStip‐
       ple().  params returns one value, the  line  width  as  specified  with
       glLineWidth().  The  initial value is 1.	 params returns one value, the
       width difference between	 adjacent  supported  widths  for  antialiased
       lines.  See glLineWidth().  params returns two values: the smallest and
       largest supported widths	 for  antialiased  lines.  See	glLineWidth().
       params  returns one value, the base offset added to all names in arrays
       presented to glCallLists(). The initial value is 0.  See	 glListBase().
       params  returns one value, the name of the display list currently under
       construction. 0 is returned if no display list is currently under  con‐
       struction.   The	 initial  value is 0. See glNewList().	params returns
       one value, a symbolic constant indicating the construction mode of  the
       display	list currently under construction. The initial value is 0. See
       glNewList().  params returns one value, a symbolic constant  indicating
       the  selected  logic operation mode. The initial value is GL_COPY.  See
       glLogicOp().  params returns a single boolean value indicating  whether
       1D  evaluation  generates  colors.  The initial value is GL_FALSE.  See
       glMap1().  params returns two values: the endpoints  of	the  1D	 map's
       grid  domain.  The  initial  value  is (0, 1). See glMapGrid().	params
       returns one value, the number  of  partitions  in  the  1D  map's  grid
       domain. The initial value is 1. See glMapGrid().	 params returns a sin‐
       gle boolean value indicating  whether  1D  evaluation  generates	 color
       indices. The initial value is GL_FALSE. See glMap1().  params returns a
       single boolean value indicating whether 1D  evaluation  generates  nor‐
       mals.  The  initial value is GL_FALSE.  See glMap1().  params returns a
       single boolean value indicating whether 1D evaluation generates 1D tex‐
       ture  coordinates. The initial value is GL_FALSE. See glMap1().	params
       returns a single boolean value indicating whether 1D evaluation	gener‐
       ates  2D	 texture  coordinates.	The  initial  value  is	 GL_FALSE. See
       glMap1().  params returns a single boolean value indicating whether  1D
       evaluation  generates  3D  texture  coordinates.	 The  initial value is
       GL_FALSE. See glMap1().	params returns a single boolean value indicat‐
       ing whether 1D evaluation generates 4D texture coordinates. The initial
       value is GL_FALSE. See glMap1().	 params returns a single boolean value
       indicating  whether  1D evaluation generates 3D vertex coordinates. The
       initial value is GL_FALSE. See glMap1().	 params returns a single bool‐
       ean  value indicating whether 1D evaluation generates 4D vertex coordi‐
       nates. The initial value is GL_FALSE. See glMap1().  params  returns  a
       single boolean value indicating whether 2D evaluation generates colors.
       The initial value is GL_FALSE.  See glMap2().  params returns four val‐
       ues:  the  endpoints  of the 2D map's i and j grid domains. The initial
       value is (0,1; 0,1). See glMapGrid().  params returns two  values:  the
       number of partitions in the 2D map's i and j grid domains.  The initial
       value is (1,1). See glMapGrid().	 params returns a single boolean value
       indicating  whether  2D evaluation generates color indices. The initial
       value is GL_FALSE. See glMap2().	 params returns a single boolean value
       indicating  whether  2D evaluation generates normals. The initial value
       is GL_FALSE.  See glMap2().  params  returns  a	single	boolean	 value
       indicating  whether 2D evaluation generates 1D texture coordinates. The
       initial value is GL_FALSE. See glMap2().	 params returns a single bool‐
       ean value indicating whether 2D evaluation generates 2D texture coordi‐
       nates. The initial value is GL_FALSE. See glMap2().  params  returns  a
       single boolean value indicating whether 2D evaluation generates 3D tex‐
       ture coordinates. The initial value is GL_FALSE. See glMap2().	params
       returns	a single boolean value indicating whether 2D evaluation gener‐
       ates 4D	texture	 coordinates.  The  initial  value  is	GL_FALSE.  See
       glMap2().   params returns a single boolean value indicating whether 2D
       evaluation generates  3D	 vertex	 coordinates.  The  initial  value  is
       GL_FALSE. See glMap2().	params returns a single boolean value indicat‐
       ing whether 2D evaluation generates 4D vertex coordinates. The  initial
       value is GL_FALSE. See glMap2().	 params returns a single boolean value
       indicating if colors and color indices are  to  be  replaced  by	 table
       lookup  during  pixel  transfers.  The  initial	value is GL_FALSE. See
       glPixelTransfer().  params returns a single boolean value indicating if
       stencil	indices are to be replaced by table lookup during pixel trans‐
       fers. The initial value is  GL_FALSE.  See  glPixelTransfer().	params
       returns one value, a symbolic constant indicating which matrix stack is
       currently the target of all matrix operations.  The  initial  value  is
       GL_MODELVIEW.  See  glMatrixMode().   params returns one value, a rough
       estimate of the largest 3D texture that the GL can handle.  If  the  GL
       version	is  1.2	 or greater, use GL_PROXY_TEXTURE_3D to determine if a
       texture is too large. See glTexImage3D().   params  returns  one	 value
       indicating  the	maximum supported depth of the client attribute stack.
       See glPushClientAttrib().  params returns one value, the	 maximum  sup‐
       ported depth of the attribute stack. The value must be at least 16. See
       glPushAttrib().	params returns one value, the maximum number of appli‐
       cation-defined  clipping	 planes.  The  value  must  be at least 6. See
       glClipPlane().  params returns one value, the maximum  supported	 depth
       of the color matrix stack.  The value must be at least 2. See glPushMa‐
       trix().	params returns one value, the recommended  maximum  number  of
       vertex  array  indices.	See glDrawRangeElements().  params returns one
       value, the recommended maximum number of vertex	array  vertices.   See
       glDrawRangeElements().	params returns one value, the maximum equation
       order supported by 1D and 2D evaluators. The value must be at least  8.
       See  glMap1() and glMap2().  params returns one value, the maximum num‐
       ber of lights. The value must be at least  8.  See  glLight().	params
       returns	one value, the maximum recursion depth allowed during display-
       list traversal. The value  must	be  at	least  64.  See	 glCallList().
       params  returns one value, the maximum supported depth of the modelview
       matrix stack. The value	must  be  at  least  32.  See  glPushMatrix().
       params  returns one value, the maximum supported depth of the selection
       name stack. The value must be at least 64.  See	glPushName().	params
       returns	one value, the maximum supported size of a glPixelMap() lookup
       table. The value must be at least 32. See glPixelMap().	params returns
       one  value, the maximum supported depth of the projection matrix stack.
       The value must be at least 2. See glPushMatrix().  params  returns  one
       value. The value gives a rough estimate of the largest texture that the
       GL can handle. If the GL version is 1.1 or greater,  use	 GL_PROXY_TEX‐
       TURE_1D	or GL_PROXY_TEXTURE_2D to determine if a texture is too large.
       See glTexImage1D() and glTexImage2D().  params returns one  value,  the
       maximum	supported depth of the texture matrix stack. The value must be
       at least 2. See glPushMatrix().	params returns a single value indicat‐
       ing  the	 number of texture units supported. The value must be at least
       1. See glActiveTextureARB().  params returns two	 values:  the  maximum
       supported  width	 and height of the viewport. These must be at least as
       large as the visible dimensions of the display being rendered  to.  See
       glViewport().  params returns a single boolean value indicating whether
       pixel minmax values are computed.  The initial value is	GL_FALSE.  See
       glMinmax().  params returns sixteen values: the modelview matrix on the
       top of the modelview matrix stack. Initially this matrix is  the	 iden‐
       tity matrix.  See glPushMatrix().  params returns one value, the number
       of matrices on the modelview matrix stack. The initial value is 1.  See
       glPushMatrix().	 params	 returns one value, the number of names on the
       selection name stack. The initial value is 0. See glPushName().	params
       returns	a single boolean value, indicating whether the normal array is
       enabled. The initial value is GL_FALSE.	See glNormalPointer().	params
       returns	one  value, the byte offset between consecutive normals in the
       normal array. The initial value is 0.  See  glNormalPointer().	params
       returns	one  value,  the  data	type  of each coordinate in the normal
       array. The initial value is GL_FLOAT.  See  glNormalPointer().	params
       returns a single boolean value indicating whether normals are automati‐
       cally scaled to unit length after they have  been  transformed  to  eye
       coordinates.  The  initial  value  is GL_FALSE. See glNormal().	params
       returns one value, the byte alignment used for writing  pixel  data  to
       memory. The initial value is 4. See glPixelStore().  params returns one
       value, the image height used for writing pixel  data  to	 memory.   The
       initial	value is 0. See glPixelStore().	 params returns a single bool‐
       ean value indicating whether single-bit pixels being written to	memory
       are  written  first to the least significant bit of each unsigned byte.
       The initial value is GL_FALSE.  See glPixelStore().  params returns one
       value,  the  row length used for writing pixel data to memory. The ini‐
       tial value is 0. See glPixelStore().  params  returns  one  value,  the
       number  of  pixel images skipped before the first pixel is written into
       memory. The initial value is 0. See glPixelStore().  params returns one
       value,  the number of pixel locations skipped before the first pixel is
       written into memory.  The  initial  value  is  0.  See  glPixelStore().
       params returns one value, the number of rows of pixel locations skipped
       before the first pixel is written into memory. The initial value is  0.
       See  glPixelStore().   params returns a single boolean value indicating
       whether the bytes of two-byte and four-byte pixel  indices  and	compo‐
       nents  are swapped before being written to memory. The initial value is
       GL_FALSE.  See glPixelStore().  params returns one  value,  a  symbolic
       constant	 indicating  the  mode of the perspective correction hint. The
       initial value is GL_DONT_CARE. See glHint().  params returns one value,
       the  size  of  the  alpha-to-alpha pixel translation table. The initial
       value is 1. See glPixelMap().  params returns one value,	 the  size  of
       the  blue-to-blue  pixel translation table. The initial value is 1. See
       glPixelMap().  params returns one value, the size of the green-to-green
       pixel  translation  table.  The	initial	 value is 1. See glPixelMap().
       params returns one value, the size of the index-to-alpha pixel transla‐
       tion  table.  The initial value is 1. See glPixelMap().	params returns
       one value, the size of the index-to-blue pixel translation  table.  The
       initial	value  is  1. See glPixelMap().	 params returns one value, the
       size of the index-to-green pixel translation table. The	initial	 value
       is  1.  See  glPixelMap().   params  returns one value, the size of the
       index-to-index pixel translation table. The initial  value  is  1.  See
       glPixelMap().   params  returns one value, the size of the index-to-red
       pixel translation table. The initial  value  is	1.  See	 glPixelMap().
       params  returns one value, the size of the red-to-red pixel translation
       table. The initial value is 1. See glPixelMap().	  params  returns  one
       value,  the size of the stencil-to-stencil pixel translation table. The
       initial value is 1. See glPixelMap().  params returns  one  value,  the
       point  size  as	specified  by  glPointSize().  The initial value is 1.
       params returns one value, the size  difference  between	adjacent  sup‐
       ported sizes for antialiased points. See glPointSize().	params returns
       two values: the smallest and largest supported  sizes  for  antialiased
       points.	The smallest size must be at most 1, and the largest size must
       be at least 1. See glPointSize().   params  returns  a  single  boolean
       value indicating whether antialiasing of points is enabled. The initial
       value is GL_FALSE. See glPointSize().  params returns one value, a sym‐
       bolic  constant indicating the mode of the point antialiasing hint. The
       initial value is GL_DONT_CARE. See glHint().  params returns  two  val‐
       ues: symbolic constants indicating whether front-facing and back-facing
       polygons are rasterized as points, lines, or filled polygons. The  ini‐
       tial  value is GL_FILL. See glPolygonMode().  params returns one value,
       the scaling factor used to determine the variable offset that is	 added
       to the depth value of each fragment generated when a polygon is raster‐
       ized. The initial value is 0. See  glPolygonOffset().   params  returns
       one value. This value is multiplied by an implementation-specific value
       and then added to the depth value of each  fragment  generated  when  a
       polygon	is  rasterized. The initial value is 0. See glPolygonOffset().
       params returns a single boolean value indicating whether polygon offset
       is  enabled  for	 polygons in fill mode. The initial value is GL_FALSE.
       See glPolygonOffset().  params returns a single boolean value  indicat‐
       ing  whether  polygon  offset is enabled for polygons in line mode. The
       initial value is GL_FALSE. See  glPolygonOffset().   params  returns  a
       single  boolean	value indicating whether polygon offset is enabled for
       polygons in point mode. The initial  value  is  GL_FALSE.  See  glPoly‐
       gonOffset().   params returns a single boolean value indicating whether
       antialiasing of polygons is enabled. The	 initial  value	 is  GL_FALSE.
       See  glPolygonMode().   params  returns	one value, a symbolic constant
       indicating the mode of the polygon antialiasing hint. The initial value
       is  GL_DONT_CARE.  See glHint().	 params returns a single boolean value
       indicating whether polygon stippling is enabled. The initial  value  is
       GL_FALSE.  See  glPolygonStipple().   params  returns  a single boolean
       value indicating whether post color  matrix  transformation  lookup  is
       enabled.	 The  initial  value  is GL_FALSE. See glColorTable().	params
       returns one value, the red bias factor applied to RGBA fragments	 after
       color matrix transformations. The initial value is 0. See glPixelTrans‐
       fer().  params returns one value, the green bias factor applied to RGBA
       fragments  after	 color matrix transformations. The initial value is 0.
       See glPixelTransfer() params returns one value, the  blue  bias	factor
       applied	to RGBA fragments after color matrix transformations. The ini‐
       tial value is 0. See glPixelTransfer().	params returns one value,  the
       alpha  bias  factor applied to RGBA fragments after color matrix trans‐
       formations. The initial value  is  0.  See  glPixelTransfer().	params
       returns one value, the red scale factor applied to RGBA fragments after
       color matrix transformations. The initial value is 1. See glPixelTrans‐
       fer().	params	returns	 one  value, the green scale factor applied to
       RGBA fragments after color matrix transformations. The initial value is
       1.  See	glPixelTransfer().   params  returns one value, the blue scale
       factor applied to RGBA fragments after  color  matrix  transformations.
       The  initial  value  is	1.  See glPixelTransfer().  params returns one
       value, the alpha scale factor applied to	 RGBA  fragments  after	 color
       matrix  transformations. The initial value is 1. See glPixelTransfer().
       params returns a single boolean value indicating whether post  convolu‐
       tion  lookup  is	 enabled.  The	initial	 value is GL_FALSE. See glCol‐
       orTable().  params returns one value, the red bias  factor  applied  to
       RGBA  fragments after convolution. The initial value is 0. See glPixel‐
       Transfer().  params returns one value, the green bias factor applied to
       RGBA  fragments after convolution. The initial value is 0. See glPixel‐
       Transfer().  params returns one value, the blue bias factor applied  to
       RGBA  fragments after convolution. The initial value is 0. See glPixel‐
       Transfer().  params returns one value, the alpha bias factor applied to
       RGBA  fragments after convolution. The initial value is 0. See glPixel‐
       Transfer().  params returns one value, the red scale factor applied  to
       RGBA  fragments after convolution. The initial value is 1. See glPixel‐
       Transfer().  params returns one value, the green scale  factor  applied
       to  RGBA	 fragments  after  convolution.	 The  initial value is 1.  See
       glPixelTransfer().  params returns one value,  the  blue	 scale	factor
       applied	to  RGBA  fragments after convolution. The initial value is 1.
       See glPixelTransfer().  params returns one value, the alpha scale  fac‐
       tor  applied  to RGBA fragments after convolution. The initial value is
       1.  See glPixelTransfer().  params returns sixteen values: the  projec‐
       tion  matrix  on the top of the projection matrix stack. Initially this
       matrix is the identity matrix. See glPushMatrix().  params returns  one
       value,  the number of matrices on the projection matrix stack. The ini‐
       tial value is 1. See glPushMatrix().  params returns one value, a  sym‐
       bolic  constant	indicating which color buffer is selected for reading.
       The initial value is GL_BACK if there is a back buffer, otherwise it is
       GL_FRONT.  See glReadPixels() and glAccum().  params returns one value,
       the red bias factor used during pixel transfers.	 The initial value  is
       0.  params returns one value, the number of red bitplanes in each color
       buffer.	params returns one value, the red  scale  factor  used	during
       pixel transfers. The initial value is 1. See glPixelTransfer().	params
       returns one value, a symbolic constant indicating whether the GL is  in
       render,	select,	 or feedback mode. The initial value is GL_RENDER. See
       glRenderMode().	params returns single boolean value indicating whether
       normal  rescaling  is enabled. See glEnable().  params returns a single
       boolean value indicating whether the GL is in RGBA mode (true) or color
       index  mode  (false). See glColor().  params returns four values: the x
       and y window coordinates of the scissor box, followed by its width  and
       height.	Initially  the	x  and y window coordinates are both 0 and the
       width and height are set to the size of the  window.  See  glScissor().
       params  returns a single boolean value indicating whether scissoring is
       enabled. The initial value is GL_FALSE. See glScissor().	 params return
       one  value,  the	 size  of  the selection buffer. See glSelectBuffer().
       params returns a single boolean value indicating whether	 2D  separable
       convolution  is	enabled. The initial value is GL_FALSE.	 See glSepara‐
       bleFilter2D().  params returns one value, a symbolic constant  indicat‐
       ing  whether  the  shading mode is flat or smooth. The initial value is
       GL_SMOOTH. See glShadeModel().  params returns two values, the smallest
       and  largest supported widths for antialiased lines. See glLineWidth().
       params returns one value, the granularity  of  widths  for  antialiased
       lines.  See glLineWidth().  params returns two values, the smallest and
       largest supported widths for  antialiased  points.  See	glPointSize().
       params  returns	one  value,  the  granularity of sizes for antialiased
       points. See glPointSize().  params returns one  value,  the  number  of
       bitplanes  in  the stencil buffer.  params returns one value, the index
       to which the stencil bitplanes are cleared. The initial value is 0. See
       glClearStencil().   params returns one value, a symbolic constant indi‐
       cating what action is taken when the stencil test  fails.  The  initial
       value  is GL_KEEP. See glStencilOp().  params returns one value, a sym‐
       bolic constant indicating what function is used to compare the  stencil
       reference  value	 with  the  stencil buffer value. The initial value is
       GL_ALWAYS. See glStencilFunc().	params returns one value,  a  symbolic
       constant	 indicating what action is taken when the stencil test passes,
       but the depth test fails. The initial value  is	GL_KEEP.  See  glSten‐
       cilOp().	 params returns one value, a symbolic constant indicating what
       action is taken when the stencil test passes and the depth test passes.
       The  initial  value  is GL_KEEP. See glStencilOp().  params returns one
       value, the reference value that is compared with the  contents  of  the
       stencil	buffer.	 The  initial value is 0. See glStencilFunc().	params
       returns a single boolean value indicating whether  stencil  testing  of
       fragments  is  enabled.	The initial value is GL_FALSE.	See glStencil‐
       Func() and glStencilOp().  params returns one value, the mask  that  is
       used  to	 mask  both the stencil reference value and the stencil buffer
       value before they are compared.	The initial value is all 1's. See glS‐
       tencilFunc().  params returns one value, the mask that controls writing
       of the stencil bitplanes. The initial value is all 1's. See  glStencil‐
       Mask().	 params	 returns  a  single  boolean  value indicating whether
       stereo buffers (left and right)	are  supported.	  params  returns  one
       value,  an  estimate  of the number of bits of subpixel resolution that
       are used to position rasterized geometry	 in  window  coordinates.  The
       initial	value  is 4.  params returns a single boolean value indicating
       whether 1D texture mapping is enabled. The initial value	 is  GL_FALSE.
       See  glTexImage1D().   params  returns  a single value, the name of the
       texture currently bound to the target GL_TEXTURE_1D. The initial	 value
       is 0. See glBindTexture().  params returns a single boolean value indi‐
       cating whether 2D texture mapping is  enabled.  The  initial  value  is
       GL_FALSE.  See glTexImage2D().  params returns a single value, the name
       of the texture currently bound to the target GL_TEXTURE_2D. The initial
       value is 0. See glBindTexture().	 params returns a single boolean value
       indicating whether 3D texture mapping is enabled. The initial value  is
       GL_FALSE.  See glTexImage3D().  params returns a single value, the name
       of the texture currently bound to the target GL_TEXTURE_3D. The initial
       value is 0. See glBindTexture().	 params returns a single boolean value
       indicating whether the texture coordinate array is enabled. The initial
       value  is GL_FALSE. See glTexCoordPointer().  params returns one value,
       the number of coordinates per element in the texture coordinate	array.
       The  initial  value  is 4. See glTexCoordPointer().  params returns one
       value, the byte offset between  consecutive  elements  in  the  texture
       coordinate  array.  The	initial	 value	is 0. See glTexCoordPointer().
       params returns one value, the data type of the coordinates in the  tex‐
       ture  coordinate array. The initial value is GL_FLOAT.  See glTexCoord‐
       Pointer().  params returns a single boolean  value  indicating  whether
       automatic  generation of the q texture coordinate is enabled.  The ini‐
       tial value is GL_FALSE. See glTexGen().	params returns a single	 bool‐
       ean  value  indicating  whether	automatic  generation of the r texture
       coordinate is enabled.  The initial value is GL_FALSE. See  glTexGen().
       params returns a single boolean value indicating whether automatic gen‐
       eration of the S texture coordinate is enabled.	The initial  value  is
       GL_FALSE.  See glTexGen().  params returns a single boolean value indi‐
       cating whether automatic generation of  the  T  texture	coordinate  is
       enabled. The initial value is GL_FALSE. See glTexGen().	params returns
       sixteen values: the texture matrix on the top  of  the  texture	matrix
       stack.  Initially  this	matrix	is the identity matrix.	 See glPushMa‐
       trix().	params returns one value, the number of matrices on  the  tex‐
       ture  matrix stack. The initial value is 1. See glPushMatrix().	params
       returns one value, the byte alignment used for reading pixel data  from
       memory. The initial value is 4. See glPixelStore().  params returns one
       value, the image height used for reading pixel data from	 memory.   The
       initial	is  0.	See  glPixelStore().   params returns a single boolean
       value indicating whether single-bit pixels being read from  memory  are
       read  first  from  the least significant bit of each unsigned byte. The
       initial value is GL_FALSE.  See	glPixelStore().	  params  returns  one
       value, the row length used for reading pixel data from memory. The ini‐
       tial value is 0. See glPixelStore().  params  returns  one  value,  the
       number of pixel images skipped before the first pixel is read from mem‐
       ory. The initial value is 0. See glPixelStore().	  params  returns  one
       value,  the number of pixel locations skipped before the first pixel is
       read from memory. The initial value is 0. See  glPixelStore().	params
       returns one value, the number of rows of pixel locations skipped before
       the first pixel is read from memory.  The  initial  value  is  0.   See
       glPixelStore().	 params	 returns  a  single  boolean  value indicating
       whether the bytes of two-byte and four-byte pixel  indices  and	compo‐
       nents  are  swapped  after being read from memory. The initial value is
       GL_FALSE.  See glPixelStore().  params returns a single	boolean	 value
       indicating  whether  the	 vertex array is enabled. The initial value is
       GL_FALSE.  See glVertexPointer().  params returns one value, the number
       of  coordinates per vertex in the vertex array. The initial value is 4.
       See glVertexPointer().  params  returns	one  value,  the  byte	offset
       between	consecutive vertexes in the vertex array. The initial value is
       0. See glVertexPointer().  params returns one value, the data  type  of
       each coordinate in the vertex array. The initial value is GL_FLOAT. See
       glVertexPointer().  params returns four values:	the  x	and  y	window
       coordinates  of	the  viewport,	followed by its width and height. Ini‐
       tially the x and y window coordinates are both set to 0, and the	 width
       and height are set to the width and height of the window into which the
       GL will do its rendering. See glViewport().  params returns one	value,
       the  x  pixel  zoom  factor. The initial value is 1. See glPixelZoom().
       params returns one value, the y pixel zoom factor. The initial value is
       1. See glPixelZoom().

       Many  of	 the  boolean parameters can also be queried more easily using
       glIsEnabled().

NOTES
       GL_COLOR_LOGIC_OP,	  GL_COLOR_ARRAY,	  GL_COLOR_ARRAY_SIZE,
       GL_COLOR_ARRAY_STRIDE,	  GL_COLOR_ARRAY_TYPE,	   GL_EDGE_FLAG_ARRAY,
       GL_EDGE_FLAG_ARRAY_STRIDE,    GL_INDEX_ARRAY,	GL_INDEX_ARRAY_STRIDE,
       GL_INDEX_ARRAY_TYPE,    GL_INDEX_LOGIC_OP,   GL_NORMAL_ARRAY,   GL_NOR‐
       MAL_ARRAY_STRIDE,    GL_NORMAL_ARRAY_TYPE,     GL_POLYGON_OFFSET_UNITS,
       GL_POLYGON_OFFSET_FACTOR,    GL_POLYGON_OFFSET_FILL,    GL_POLYGON_OFF‐
       SET_LINE,  GL_POLYGON_OFFSET_POINT,   GL_TEXTURE_COORD_ARRAY,   GL_TEX‐
       TURE_COORD_ARRAY_SIZE,	   GL_TEXTURE_COORD_ARRAY_STRIDE,      GL_TEX‐
       TURE_COORD_ARRAY_TYPE, GL_VERTEX_ARRAY,	GL_VERTEX_ARRAY_SIZE,  GL_VER‐
       TEX_ARRAY_STRIDE, and GL_VERTEX_ARRAY_TYPE are available only if the GL
       version is 1.1 or greater.

       GL_ALIASED_POINT_SIZE_RANGE,	    GL_ALIASED_POINT_SIZE_GRANULARITY,
       GL_FEEDBACK_BUFFER_SIZE,	 GL_FEEDBACK_BUFFER_TYPE, GL_LIGHT_MODEL_AMBI‐
       ENT, GL_LIGHT_MODEL_COLOR_CONTROL, GL_MAX_3D_TEXTURE_SIZE,  GL_MAX_ELE‐
       MENTS_INDICES,	   GL_MAX_ELEMENTS_VERTICES,	 GL_PACK_IMAGE_HEIGHT,
       GL_PACK_SKIP_IMAGES,    GL_RESCALE_NORMAL,    GL_SELECTION_BUFFER_SIZE,
       GL_SMOOTH_LINE_WIDTH_GRANULARITY,	   GL_SMOOTH_LINE_WIDTH_RANGE,
       GL_SMOOTH_POINT_SIZE_GRANULARITY,  GL_SMOOTH_POINT_SIZE_RANGE,  GL_TEX‐
       TURE_3D,	    GL_TEXTURE_BINDING_3D,     GL_UNPACK_IMAGE_HEIGHT,	   and
       GL_UNPACK_SKIP_IMAGES are available only if the GL version  is  1.2  or
       greater.

       GL_LINE_WIDTH_GRANULARITY  was deprecated in GL version 1.2.  Its func‐
       tionality was replaced by GL_SMOOTH_LINE_WIDTH_GRANULARITY.

       GL_LINE_WIDTH_RANGE was deprecated in GL version 1.2.  Its  functional‐
       ity was replaced by GL_SMOOTH_LINE_WIDTH_RANGE.

       GL_POINT_SIZE_GRANULARITY  was deprecated in GL version 1.2.  Its func‐
       tionality was replaced by GL_SMOOTH_POINT_SIZE_GRANULARITY.

       GL_POINT_SIZE_RANGE was deprecated in GL version 1.2.  Its  functional‐
       ity was replaced by GL_SMOOTH_POINT_SIZE_RANGE.

       GL_BLEND_COLOR,		 GL_BLEND_EQUATION,	      GL_COLOR_MATRIX,
       GL_COLOR_MATRIX_STACK_DEPTH, GL_COLOR_TABLE, GL_CONVOLUTION_1D, GL_CON‐
       VOLUTION_2D,  GL_HISTOGRAM, GL_MAX_COLOR_MATRIX_STACK_DEPTH, GL_MINMAX,
       GL_POST_COLOR_MATRIX_COLOR_TABLE,	GL_POST_COLOR_MATRIX_RED_BIAS,
       GL_POST_COLOR_MATRIX_GREEN_BIAS,	       GL_POST_COLOR_MATRIX_BLUE_BIAS,
       GL_POST_COLOR_MATRIX_ALPHA_BIAS,	       GL_POST_COLOR_MATRIX_RED_SCALE,
       GL_POST_COLOR_MATRIX_GREEN_SCALE,      GL_POST_COLOR_MATRIX_BLUE_SCALE,
       GL_POST_COLOR_MATRIX_ALPHA_SCALE,      GL_POST_CONVOLUTION_COLOR_TABLE,
       GL_POST_CONVOLUTION_RED_BIAS,	       GL_POST_CONVOLUTION_GREEN_BIAS,
       GL_POST_CONVOLUTION_BLUE_BIAS,	       GL_POST_CONVOLUTION_ALPHA_BIAS,
       GL_POST_CONVOLUTION_RED_SCALE,	      GL_POST_CONVOLUTION_GREEN_SCALE,
       GL_POST_CONVOLUTION_BLUE_SCALE,	GL_POST_CONVOLUTION_ALPHA_SCALE,   and
       GL_SEPARABLE_2D	are  available only if GL_ARB_imaging is returned from
       glGet() when called with the argument GL_EXTENSIONS.

       GL_ACTIVE_TEXTURE_ARB,  GL_CLIENT_ACTIVE_TEXTURE_ARB,  and  GL_MAX_TEX‐
       TURE_UNITS_ARB  are  available  only if GL_ARB_multitexture is returned
       from glGet() when called with the argument GL_EXTENSIONS.

       When the GL_ARB_multitexture  extension	is  supported,	the  following
       parameters  return  the	associated  value for the active texture unit:
       GL_CURRENT_RASTER_TEXTURE_COORDS, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D,
       GL_TEXTURE_2D,  GL_TEXTURE_BINDING_2D,  GL_TEXTURE_3D, GL_TEXTURE_BIND‐
       ING_3D, GL_TEXTURE_GEN_S, GL_TEXTURE_GEN_T,  GL_TEXTURE_GEN_R,  GL_TEX‐
       TURE_GEN_Q,  GL_TEXTURE_MATRIX,	and  GL_TEXTURE_STACK_DEPTH. Likewise,
       the following parameters return the associated  value  for  the	active
       client	   texture	unit:	   GL_TEXTURE_COORD_ARRAY,     GL_TEX‐
       TURE_COORD_ARRAY_SIZE,	   GL_TEXTURE_COORD_ARRAY_STRIDE,      GL_TEX‐
       TURE_COORD_ARRAY_TYPE.

ERRORS
       GL_INVALID_ENUM is generated if pname is not an accepted value.

       GL_INVALID_OPERATION  is	 generated  if glGet() is executed between the
       execution of glBegin() and the corresponding execution of glEnd().

SEE ALSO
       glGetClipPlane(3),   glGetColorTable(3),	  glGetColorTableParameter(3),
       glGetConvolutionFilter(3), glGetConvolutionParameter(3), glGetError(3),
       glGetHistogram(3),      glGetHistogramParameter(3),	glGetLight(3),
       glGetMap(3), glGetMaterial(3), glGetMinmax(3), glGetMinmaxParameter(3),
       glGetPixelMap(3), glGetPointerv(3), glGetPolygonStipple(3),  glGetSepa‐
       rableFilter(3),	glGetString(3), glGetTexEnv(3), glGetTexGen(3), glGet‐
       TexImage(3), glGetTexLevelParameter(3),	glGetTexParameter(3),  glIsEn‐
       abled(3)

								     glGet(3G)
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