glGet.3gl
Digital Equipment Corporation OpenGL man pages

glGet.3gl




Name

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


C Specification

  void glGetBooleanv( GLenum pname,
		      GLboolean	*params	)


C Specification

  void glGetDoublev( GLenum pname,
		     GLdouble *params )


C Specification

  void glGetFloatv( GLenum pname,
		    GLfloat *params )


C Specification

  void glGetIntegerv( GLenum pname,
		      GLint *params )


Parameters


  pname	  Specifies the	parameter value	to be returned.	 The symbolic
	  constants in the list	below are accepted.

  params  Returns the value or values of the specified 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 zero.
  Otherwise, it	is converted to	GL_TRUE.  If glGetIntegerv 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:

  GL_ACCUM_ALPHA_BITS	   params returns one value, the number	of alpha
			   bitplanes in	the accumulation buffer.

  GL_ACCUM_BLUE_BITS	   params returns one value, the number	of blue
			   bitplanes in	the accumulation buffer.

  GL_ACCUM_CLEAR_VALUE	   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
			   representation such that 1.0	returns	the most
			   positive representable integer value, and -1.0
			   returns the most negative representable integer
			   value.  See glClearAccum.

  GL_ACCUM_GREEN_BITS	   params returns one value, the number	of green
			   bitplanes in	the accumulation buffer.

  GL_ACCUM_RED_BITS	   params returns one value, the number	of red
			   bitplanes in	the accumulation buffer.

  GL_ALPHA_BIAS		   params returns one value, the alpha bias factor
			   used	during pixel transfers.	 See glPixelTransfer.

  GL_ALPHA_BITS		   params returns one value, the number	of alpha
			   bitplanes in	each color buffer.

  GL_ALPHA_SCALE	   params returns one value, the alpha scale factor
			   used	during pixel transfers.	 See glPixelTransfer.

  GL_ALPHA_TEST		   params returns a single Boolean value indicating
			   whether alpha testing of fragments is enabled.
			   See glAlphaFunc.

  GL_ALPHA_TEST_FUNC	   params returns one value, the symbolic name of the
			   alpha test function.	 See glAlphaFunc.

  GL_ALPHA_TEST_REF	   params returns one value, the reference value for
			   the alpha test.  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
			   representable integer value.

  GL_ATTRIB_STACK_DEPTH	   params returns one value, the depth of the
			   attribute stack.  If	the stack is empty, zero is
			   returned.  See glPushAttrib.

  GL_AUTO_NORMAL	   params returns a single Boolean value indicating
			   whether 2-D map evaluation automatically generates
			   surface normals.  See glMap2.

  GL_AUX_BUFFERS	   params returns one value, the number	of auxiliary
			   color buffers.

  GL_BLEND		   params returns a single Boolean value indicating
			   whether blending is enabled.	 See glBlendFunc.

  GL_BLEND_DST		   params returns one value, the symbolic constant
			   identifying the destination blend function.	See
			   glBlendFunc.

  GL_BLEND_SRC		   params returns one value, the symbolic constant
			   identifying the source blend	function.  See
			   glBlendFunc.

  GL_BLUE_BIAS		   params returns one value, the blue bias factor
			   used	during pixel transfers.	 See glPixelTransfer.

  GL_BLUE_BITS		   params returns one value, the number	of blue
			   bitplanes in	each color buffer.

  GL_BLUE_SCALE		   params returns one value, the blue scale factor
			   used	during pixel transfers.	 See glPixelTransfer.

  GL_CLIP_PLANEi	   params returns a single Boolean value indicating
			   whether the specified clipping plane	is enabled.
			   See glClipPlane.

  GL_COLOR_ARRAY_EXT	   params returns a single boolean value, indicating
			   whether the color array is enabled.	See
			   glColorPointerEXT.

  GL_COLOR_ARRAY_COUNT_EXT params returns one value, the number	of colors in
			   the color array, counting from the first, that are
			   static.  See	glColorPointerEXT.

  GL_COLOR_ARRAY_SIZE_EXT  params returns one value, the number	of components
			   per color in	the color array.  See
			   glColorPointerEXT.

  GL_COLOR_ARRAY_STRIDE_EXT
			   params returns one value, the byte offset between
			   consecutive colors in the color array.  See
			   glColorPointerEXT.

  GL_COLOR_ARRAY_TYPE_EXT  params returns one value, the data type of each
			   component in	the color array.  See
			   glColorPointerEXT.

  GL_COLOR_CLEAR_VALUE	   params returns four values: 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	negative representable integer value.  See
			   glClearColor.

  GL_COLOR_MATERIAL	   params returns a single Boolean value indicating
			   whether one or more material	parameters are
			   tracking the	current	color.	See glColorMaterial.

  GL_COLOR_MATERIAL_FACE   params returns one value, a symbolic	constant
			   indicating which materials have a parameter that
			   is tracking the current color.  See
			   glColorMaterial.

  GL_COLOR_MATERIAL_PARAMETER
			   params returns one value, a symbolic	constant
			   indicating which material parameters	are tracking
			   the current color.  See glColorMaterial.

  GL_COLOR_WRITEMASK	   params returns four Boolean values: the red,
			   green, blue,	and alpha write	enables	for the	color
			   buffers.  See glColorMask.

  GL_CULL_FACE		   params returns a single Boolean value indicating
			   whether polygon culling is enabled.	See
			   glCullFace.

  GL_CULL_FACE_MODE	   params returns one value, a symbolic	constant
			   indicating which polygon faces are to be culled.
			   See glCullFace.

  GL_CURRENT_COLOR	   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
			   representable integer value.	 See glColor.

  GL_CURRENT_INDEX	   params returns one value, the current color index.
			   See glIndex.

  GL_CURRENT_NORMAL	   params returns three	values:	the x, y, and z
			   values of the current normal.  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.	 See glNormal.

  GL_CURRENT_RASTER_COLOR  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 representable integer value.  See
			   glRasterPos.

  GL_CURRENT_RASTER_DISTANCE
			   params returns one value, the distance from the
			   eye to the current raster position.	See
			   glRasterPos.

  GL_CURRENT_RASTER_INDEX  params returns one value, the color index of	the
			   current raster position.  See glRasterPos.

  GL_CURRENT_RASTER_POSITION
			   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.	 See glRasterPos.

  GL_CURRENT_RASTER_TEXTURE_COORDS
			   params returns four values: the s, t, r, and	q
			   current raster texture coordinates.	See
			   glRasterPos and glTexCoord.

  GL_CURRENT_RASTER_POSITION_VALID
			   params returns a single Boolean value indicating
			   whether the current raster position is valid.  See
			   glRasterPos.

  GL_CURRENT_TEXTURE_COORDS
			   params returns four values: the s, t, r, and	q
			   current texture coordinates.	 See glTexCoord.

  GL_DEPTH_BIAS		   params returns one value, the depth bias factor
			   used	during pixel transfers.	 See glPixelTransfer.

  GL_DEPTH_BITS		   params returns one value, the number	of bitplanes
			   in the depth	buffer.

  GL_DEPTH_CLEAR_VALUE	   params returns one value, the value that is used
			   to clear the	depth buffer.  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.	 See glClearDepth.

  GL_DEPTH_FUNC		   params returns one value, the symbolic constant
			   that	indicates the depth comparison function.  See
			   glDepthFunc.

  GL_DEPTH_RANGE	   params returns two values: the near and far
			   mapping limits for the depth	buffer.	 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.	 See glDepthRange.

  GL_DEPTH_SCALE	   params returns one value, the depth scale factor
			   used	during pixel transfers.	 See glPixelTransfer.

  GL_DEPTH_TEST		   params returns a single Boolean value indicating
			   whether depth testing of fragments is enabled.
			   See glDepthFunc and glDepthRange.

  GL_DEPTH_WRITEMASK	   params returns a single Boolean value indicating
			   if the depth	buffer is enabled for writing.	See
			   glDepthMask.

  GL_DITHER		   params returns a single Boolean value indicating
			   whether dithering of	fragment colors	and indices
			   is enabled.

  GL_DOUBLEBUFFER	   params returns a single Boolean value indicating
			   whether double buffering is supported.

  GL_DRAW_BUFFER	   params returns one value, a symbolic	constant
			   indicating which buffers are	being drawn to.	 See
			   glDrawBuffer.

  GL_EDGE_FLAG		   params returns a single Boolean value indication
			   whether the current edge flag is true or false.
			   See glEdgeFlag.

  GL_EDGE_FLAG_ARRAY_EXT   params returns a single boolean value, indicating
			   whether the edge flag array is enabled.  See
			   glEdgeFlagPointerEXT.

  GL_EDGE_FLAG_ARRAY_COUNT_EXT
			   params returns one value, the number	of edge	flags
			   in the edge flag array, counting from the first,
			   that	are static.  See glEdgeFlagPointerEXT.

  GL_EDGE_FLAG_ARRAY_STRIDE_EXT
			   params returns one value, the byte offset between
			   consecutive edge flags in the edge flag array.
			   See glEdgeFlagPointerEXT.

  GL_FOG		   params returns a single Boolean value indicating
			   whether fogging is enabled.	See glFog.

  GL_FOG_COLOR		   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.	 See glFog.

  GL_FOG_DENSITY	   params returns one value, the fog density
			   parameter.  See glFog.

  GL_FOG_END		   params returns one value, the end factor for	the
			   linear fog equation.	 See glFog.

  GL_FOG_HINT		   params returns one value, a symbolic	constant
			   indicating the mode of the fog hint.	 See glHint.

  GL_FOG_INDEX		   params returns one value, the fog color index.
			   See glFog.

  GL_FOG_MODE		   params returns one value, a symbolic	constant
			   indicating which fog	equation is selected.  See
			   glFog.

  GL_FOG_START		   params returns one value, the start factor for the
			   linear fog equation.	 See glFog.

  GL_FRONT_FACE		   params returns one value, a symbolic	constant
			   indicating whether clockwise	or counterclockwise
			   polygon winding is treated as front-facing.	See
			   glFrontFace.

  GL_GREEN_BIAS		   params returns one value, the green bias factor
			   used	during pixel transfers.

  GL_GREEN_BITS		   params returns one value, the number	of green
			   bitplanes in	each color buffer.

  GL_GREEN_SCALE	   params returns one value, the green scale factor
			   used	during pixel transfers.	 See glPixelTransfer.

  GL_INDEX_ARRAY_EXT	   params returns a single boolean value, indicating
			   whether the color index array is enabled.  See
			   glIndexPointerEXT.

  GL_INDEX_ARRAY_COUNT_EXT params returns one value, the number	of color
			   indexes in the color	index array, counting from
			   the first, that are static.	See
			   glIndexPointerEXT.

  GL_INDEX_ARRAY_STRIDE_EXT
			   params returns one value, the byte offset between
			   consecutive color indexes in	the color index
			   array.  See glIndexPointerEXT.

  GL_INDEX_ARRAY_TYPE_EXT  params returns one value, the data type of indexes
			   in the color	index array.  See glIndexPointerEXT.

  GL_INDEX_BITS		   params returns one value, the number	of bitplanes
			   in each color index buffer.

  GL_INDEX_CLEAR_VALUE	   params returns one value, the color index used to
			   clear the color index buffers.  See glClearIndex.

  GL_INDEX_MODE		   params returns a single Boolean value indicating
			   whether the GL is in	color index mode (true)	or
			   RGBA	mode (false).

  GL_INDEX_OFFSET	   params returns one value, the offset	added to
			   color and stencil indices during pixel transfers.
			   See glPixelTransfer.

  GL_INDEX_SHIFT	   params returns one value, the amount	that color
			   and stencil indices are shifted during pixel
			   transfers.  See glPixelTransfer.

  GL_INDEX_WRITEMASK	   params returns one value, a mask indicating which
			   bitplanes of	each color index buffer	can be
			   written.  See glIndexMask.

  GL_LIGHTi		   params returns a single Boolean value indicating
			   whether the specified light is enabled.  See
			   glLight and glLightModel.

  GL_LIGHTING		   params returns a single Boolean value indicating
			   whether lighting is enabled.	 See glLightModel.

  GL_LIGHT_MODEL_AMBIENT   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.  See glLightModel.

  GL_LIGHT_MODEL_LOCAL_VIEWER
			   params returns a single Boolean value indicating
			   whether specular reflection calculations treat the
			   viewer as being local to the	scene.	See
			   glLightModel.

  GL_LIGHT_MODEL_TWO_SIDE  params returns a single Boolean value indicating
			   whether separate materials are used to compute
			   lighting for	front- and back-facing polygons.  See
			   glLightModel.

  GL_LINE_SMOOTH	   params returns a single Boolean value indicating
			   whether antialiasing	of lines is enabled.  See
			   glLineWidth.

  GL_LINE_SMOOTH_HINT	   params returns one value, a symbolic	constant
			   indicating the mode of the line antialiasing	hint.
			   See glHint.

  GL_LINE_STIPPLE	   params returns a single Boolean value indicating
			   whether stippling of	lines is enabled.  See
			   glLineStipple.

  GL_LINE_STIPPLE_PATTERN  params returns one value, the 16-bit	line stipple
			   pattern.  See glLineStipple.

  GL_LINE_STIPPLE_REPEAT   params returns one value, the line stipple repeat
			   factor.  See	glLineStipple.

  GL_LINE_WIDTH		   params returns one value, the line width as
			   specified with glLineWidth.

  GL_LINE_WIDTH_GRANULARITY
			   params returns one value, the width difference
			   between adjacent supported widths for antialiased
			   lines.  See glLineWidth.

  GL_LINE_WIDTH_RANGE	   params returns two values: the smallest and
			   largest supported widths for	antialiased lines.
			   See glLineWidth.

  GL_LIST_BASE		   params returns one value, the base offset added to
			   all names in	arrays presented to glCallLists.  See
			   glListBase.

  GL_LIST_INDEX		   params returns one value, the name of the display
			   list	currently under	construction.  Zero is
			   returned if no display list is currently under
			   construction.  See glNewList.

  GL_LIST_MODE		   params returns one value, a symbolic	constant
			   indicating the construction mode of the display
			   list	currently being	constructed.  See glNewList.

  GL_LOGIC_OP		   params returns a single Boolean value indicating
			   whether fragment indexes are	merged into the
			   framebuffer using a logical operation.  See
			   glLogicOp.

  GL_LOGIC_OP_MODE	   params returns one value, a symbolic	constant
			   indicating the selected logic operational mode.
			   See glLogicOp.

  GL_MAP1_COLOR_4	   params returns a single Boolean value indicating
			   whether 1D evaluation generates colors.  See
			   glMap1.

  GL_MAP1_GRID_DOMAIN	   params returns two values: the endpoints of the
			   1-D map's grid domain.  See glMapGrid.

  GL_MAP1_GRID_SEGMENTS	   params returns one value, the number	of partitions
			   in the 1-D map's grid domain.  See glMapGrid.

  GL_MAP1_INDEX		   params returns a single Boolean value indicating
			   whether 1D evaluation generates color indices.
			   See glMap1.

  GL_MAP1_NORMAL	   params returns a single Boolean value indicating
			   whether 1D evaluation generates normals.  See
			   glMap1.

  GL_MAP1_TEXTURE_COORD_1  params returns a single Boolean value indicating
			   whether 1D evaluation generates 1D texture
			   coordinates.	 See glMap1.

  GL_MAP1_TEXTURE_COORD_2  params returns a single Boolean value indicating
			   whether 1D evaluation generates 2D texture
			   coordinates.	 See glMap1.

  GL_MAP1_TEXTURE_COORD_3  params returns a single Boolean value indicating
			   whether 1D evaluation generates 3D texture
			   coordinates.	 See glMap1.

  GL_MAP1_TEXTURE_COORD_4  params returns a single Boolean value indicating
			   whether 1D evaluation generates 4D texture
			   coordinates.	 See glMap1.

  GL_MAP1_VERTEX_3	   params returns a single Boolean value indicating
			   whether 1D evaluation generates 3D vertex
			   coordinates.	 See glMap1.

  GL_MAP1_VERTEX_4	   params returns a single Boolean value indicating
			   whether 1D evaluation generates 4D vertex
			   coordinates.	 See glMap1.

  GL_MAP2_COLOR_4	   params returns a single Boolean value indicating
			   whether 2D evaluation generates colors.  See
			   glMap2.

  GL_MAP2_GRID_DOMAIN	   params returns four values: the endpoints of	the
			   2-D map's i and j grid domains.  See	glMapGrid.

  GL_MAP2_GRID_SEGMENTS	   params returns two values: the number of
			   partitions in the 2-D map's i and j grid domains.
			   See glMapGrid.

  GL_MAP2_INDEX		   params returns a single Boolean value indicating
			   whether 2D evaluation generates color indices.
			   See glMap2.

  GL_MAP2_NORMAL	   params returns a single Boolean value indicating
			   whether 2D evaluation generates normals.  See
			   glMap2.

  GL_MAP2_TEXTURE_COORD_1  params returns a single Boolean value indicating
			   whether 2D evaluation generates 1D texture
			   coordinates.	 See glMap2.

  GL_MAP2_TEXTURE_COORD_2  params returns a single Boolean value indicating
			   whether 2D evaluation generates 2D texture
			   coordinates.	 See glMap2.

  GL_MAP2_TEXTURE_COORD_3  params returns a single Boolean value indicating
			   whether 2D evaluation generates 3D texture
			   coordinates.	 See glMap2.

  GL_MAP2_TEXTURE_COORD_4  params returns a single Boolean value indicating
			   whether 2D evaluation generates 4D texture
			   coordinates.	 See glMap2.

  GL_MAP2_VERTEX_3	   params returns a single Boolean value indicating
			   whether 2D evaluation generates 3D vertex
			   coordinates.	 See glMap2.

  GL_MAP2_VERTEX_4	   params returns a single Boolean value indicating
			   whether 2D evaluation generates 4D vertex
			   coordinates.	 See glMap2.

  GL_MAP_COLOR		   params returns a single Boolean value indicating
			   if colors and color indices are to be replaced by
			   table lookup	during pixel transfers.	 See
			   glPixelTransfer.

  GL_MAP_STENCIL	   params returns a single Boolean value indicating
			   if stencil indices are to be	replaced by table
			   lookup during pixel transfers.  See
			   glPixelTransfer.

  GL_MATRIX_MODE	   params returns one value, a symbolic	constant
			   indicating which matrix stack is currently the
			   target of all matrix	operations.  See
			   glMatrixMode.

  GL_MAX_ATTRIB_STACK_DEPTH
			   params returns one value, the maximum supported
			   depth of the	attribute stack.  See glPushAttrib.

  GL_MAX_CLIP_PLANES	   params returns one value, the maximum number	of
			   application-defined clipping	planes.	 See
			   glClipPlane.

  GL_MAX_EVAL_ORDER	   params returns one value, the maximum equation
			   order supported by 1-D and 2-D evaluators.  See
			   glMap1 and glMap2.

  GL_MAX_LIGHTS		   params returns one value, the maximum number	of
			   lights.  See	glLight.

  GL_MAX_LIST_NESTING	   params returns one value, the maximum recursion
			   depth allowed during	display-list traversal.	 See
			   glCallList.

  GL_MAX_MODELVIEW_STACK_DEPTH
			   params returns one value, the maximum supported
			   depth of the	modelview matrix stack.	 See
			   glPushMatrix.

  GL_MAX_NAME_STACK_DEPTH  params returns one value, the maximum supported
			   depth of the	selection name stack.  See
			   glPushName.

  GL_MAX_PIXEL_MAP_TABLE   params returns one value, the maximum supported
			   size	of a glPixelMap	lookup table.  See
			   glPixelMap.

  GL_MAX_PROJECTION_STACK_DEPTH
			   params returns one value, the maximum supported
			   depth of the	projection matrix stack.  See
			   glPushMatrix.

  GL_MAX_TEXTURE_SIZE	   params returns one value, the maximum width or
			   height of any texture image (without	borders).
			   See glTexImage1D and	glTexImage2D.

  GL_MAX_TEXTURE_STACK_DEPTH
			   params returns one value, the maximum supported
			   depth of the	texture	matrix stack.  See
			   glPushMatrix.

  GL_MAX_VIEWPORT_DIMS	   params returns two values: the maximum supported
			   width and height of the viewport.  See glViewport.

  GL_MODELVIEW_MATRIX	   params returns sixteen values: the modelview
			   matrix on the top of	the modelview matrix stack.
			   See glPushMatrix.

  GL_MODELVIEW_STACK_DEPTH params returns one value, the number	of matrices
			   on the modelview matrix stack.  See glPushMatrix.

  GL_NAME_STACK_DEPTH	   params returns one value, the number	of names on
			   the selection name stack.  See glPushMatrix.

  GL_NORMAL_ARRAY_EXT	   params returns a single boolean value, indicating
			   whether the normal array is enabled.	 See
			   glNormalPointerEXT.

  GL_NORMAL_ARRAY_COUNT_EXT
			   params returns one value, the number	of normals in
			   the normal array, counting from the first, that
			   are static.	See glNormalPointerEXT.

  GL_NORMAL_ARRAY_STRIDE_EXT
			   params returns one value, the byte offset between
			   consecutive normals in the normal array.  See
			   glNormalPointerEXT.

  GL_NORMAL_ARRAY_TYPE_EXT params returns one value, the data type of each
			   coordinate in the normal array.  See
			   glNormalPointerEXT.

  GL_NORMALIZE		   params returns a single Boolean value indicating
			   whether normals are automatically scaled to unit
			   length after	they have been transformed to eye
			   coordinates.	 See glNormal.

  GL_PACK_ALIGNMENT	   params returns one value, the byte alignment	used
			   for writing pixel data to memory.  See
			   glPixelStore.

  GL_PACK_LSB_FIRST	   params returns a single Boolean value indicating
			   whether single-bit pixels being written to memory
			   are written first to	the least significant bit of
			   each	unsigned byte.	See glPixelStore.

  GL_PACK_ROW_LENGTH	   params returns one value, the row length used for
			   writing pixel data to memory.  See glPixelStore.

  GL_PACK_SKIP_PIXELS	   params returns one value, the number	of pixel
			   locations skipped before the	first pixel is
			   written into	memory.	 See glPixelStore.

  GL_PACK_SKIP_ROWS	   params returns one value, the number	of rows	of
			   pixel locations skipped before the first pixel is
			   written into	memory.	 See glPixelStore.

  GL_PACK_SWAP_BYTES	   params returns a single Boolean value indicating
			   whether the bytes of	two-byte and four-byte pixel
			   indices and components are swapped before being
			   written to memory.  See glPixelStore.

  GL_PERSPECTIVE_CORRECTION_HINT
			   params returns one value, a symbolic	constant
			   indicating the mode of the perspective correction
			   hint.  See glHint.

  GL_PIXEL_MAP_A_TO_A_SIZE params returns one value, the size of the alpha-
			   to-alpha pixel translation table.  See glPixelMap.

  GL_PIXEL_MAP_B_TO_B_SIZE params returns one value, the size of the blue-
			   to-blue pixel translation table.  See glPixelMap.

  GL_PIXEL_MAP_G_TO_G_SIZE params returns one value, the size of the green-
			   to-green pixel translation table.  See glPixelMap.

  GL_PIXEL_MAP_I_TO_A_SIZE params returns one value, the size of the index-
			   to-alpha pixel translation table.  See glPixelMap.

  GL_PIXEL_MAP_I_TO_B_SIZE params returns one value, the size of the index-
			   to-blue pixel translation table.  See glPixelMap.

  GL_PIXEL_MAP_I_TO_G_SIZE params returns one value, the size of the index-
			   to-green pixel translation table.  See glPixelMap.

  GL_PIXEL_MAP_I_TO_I_SIZE params returns one value, the size of the index-
			   to-index pixel translation table.  See glPixelMap.

  GL_PIXEL_MAP_I_TO_R_SIZE params returns one value, the size of the index-
			   to-red pixel	translation table.  See	glPixelMap.

  GL_PIXEL_MAP_R_TO_R_SIZE params returns one value, the size of the red-to-
			   red pixel translation table.	 See glPixelMap.

  GL_PIXEL_MAP_S_TO_S_SIZE params returns one value, the size of the
			   stencil-to-stencil pixel translation	table.	See
			   glPixelMap.

  GL_POINT_SIZE		   params returns one value, the point size as
			   specified by	glPointSize.

  GL_POINT_SIZE_GRANULARITY
			   params returns one value, the size difference
			   between adjacent supported sizes for	antialiased
			   points.  See	glPointSize.

  GL_POINT_SIZE_RANGE	   params returns two values: the smallest and
			   largest supported sizes for antialiased points.
			   See glPointSize.

  GL_POINT_SMOOTH	   params returns a single Boolean value indicating
			   whether antialiasing	of points is enabled.  See
			   glPointSize.

  GL_POINT_SMOOTH_HINT	   params returns one value, a symbolic	constant
			   indicating the mode of the point antialiasing
			   hint.  See glHint.

  GL_POLYGON_MODE	   params returns two values: symbolic constants
			   indicating whether front-facing and back-facing
			   polygons are	rasterized as points, lines, or
			   filled polygons.  See glPolygonMode.

  GL_POLYGON_SMOOTH	   params returns a single Boolean value indicating
			   whether antialiasing	of polygons is enabled.	 See
			   glPolygonMode.

  GL_POLYGON_SMOOTH_HINT   params returns one value, a symbolic	constant
			   indicating the mode of the polygon antialiasing
			   hint.  See glHint.

  GL_POLYGON_STIPPLE	   params returns a single Boolean value indicating
			   whether stippling of	polygons is enabled.  See
			   glPolygonStipple.

  GL_PROJECTION_MATRIX	   params returns sixteen values: the projection
			   matrix on the top of	the projection matrix stack.
			   See glPushMatrix.

  GL_PROJECTION_STACK_DEPTH
			   params returns one value, the number	of matrices
			   on the projection matrix stack.  See	glPushMatrix.

  GL_READ_BUFFER	   params returns one value, a symbolic	constant
			   indicating which color buffer is selected for
			   reading.
			   See glReadPixels and	glAccum.

  GL_RED_BIAS		   params returns one value, the red bias factor used
			   during pixel	transfers.

  GL_RED_BITS		   params returns one value, the number	of red
			   bitplanes in	each color buffer.

  GL_RED_SCALE		   params returns one value, the red scale factor
			   used	during pixel transfers.	 See glPixelTransfer.

  GL_RENDER_MODE	   params returns one value, a symbolic	constant
			   indicating whether the GL is	in render, select, or
			   feedback mode.  See glRenderMode.

  GL_RGBA_MODE		   params returns a single Boolean value indicating
			   whether the GL is in	RGBA mode (true) or color
			   index mode (false).	See glColor.

  GL_SCISSOR_BOX	   params returns four values: the x and y window
			   coordinates of the scissor box, followed by its
			   width and height.  See glScissor.

  GL_SCISSOR_TEST	   params returns a single Boolean value indicating
			   whether scissoring is enabled.  See glScissor.

  GL_SHADE_MODEL	   params returns one value, a symbolic	constant
			   indicating whether the shading mode is flat or
			   smooth.  See	glShadeModel.

  GL_STENCIL_BITS	   params returns one value, the number	of bitplanes
			   in the stencil buffer.

  GL_STENCIL_CLEAR_VALUE   params returns one value, the index to which	the
			   stencil bitplanes are cleared.  See
			   glClearStencil.

  GL_STENCIL_FAIL	   params returns one value, a symbolic	constant
			   indicating what action is taken when	the stencil
			   test	fails.	See glStencilOp.

  GL_STENCIL_FUNC	   params returns one value, a symbolic	constant
			   indicating what function is used to compare the
			   stencil reference value with	the stencil buffer
			   value.  See glStencilFunc.

  GL_STENCIL_PASS_DEPTH_FAIL
			   params returns one value, a symbolic	constant
			   indicating what action is taken when	the stencil
			   test	passes,	but the	depth test fails.  See
			   glStencilOp.

  GL_STENCIL_PASS_DEPTH_PASS
			   params returns one value, a symbolic	constant
			   indicating what action is taken when	the stencil
			   test	passes and the depth test passes.  See
			   glStencilOp.

  GL_STENCIL_REF	   params returns one value, the reference value that
			   is compared with the	contents of the	stencil
			   buffer.  See	glStencilFunc.

  GL_STENCIL_TEST	   params returns a single Boolean value indicating
			   whether stencil testing of fragments	is enabled.
			   See glStencilFunc and glStencilOp.

  GL_STENCIL_VALUE_MASK	   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.
			   See glStencilFunc.

  GL_STENCIL_WRITEMASK	   params returns one value, the mask that controls
			   writing of the stencil bitplanes.  glStencilMask.

  GL_STEREO		   params returns a single Boolean value indicating
			   whether stereo buffers (left	and right) are
			   supported.

  GL_SUBPIXEL_BITS	   params returns one value, an	estimate of the
			   number of bits of subpixel resolution that are
			   used	to position rasterized geometry	in window
			   coordinates.

  GL_TEXTURE_1D		   params returns a single Boolean value indicating
			   whether 1D texture mapping is enabled.  See
			   glTexImage1D.

  GL_TEXTURE_2D		   params returns a single Boolean value indicating
			   whether 2D texture mapping is enabled.  See
			   glTexImage2D.

  GL_TEXTURE_COORD_ARRAY_EXT
			   params returns a single boolean value, indicating
			   whether the texture coordinate array	is enabled.
			   See glTexCoordPointerEXT.

  GL_TEXTURE_COORD_ARRAY_COUNT_EXT
			   params returns one value, the number	of elements
			   in the texture coordinate array, counting from the
			   first, that are static.  See	glTexCoordPointerEXT.

  GL_TEXTURE_COORD_ARRAY_SIZE_EXT
			   params returns one value, the number	of
			   coordinates per element in the texture coordinate
			   array.  See glTexCoordPointerEXT.

  GL_TEXTURE_COORD_ARRAY_STRIDE_EXT
			   params returns one value, the byte offset between
			   consecutive elements	in the texture coordinate
			   array.  See glTexCoordPointerEXT.

  GL_TEXTURE_COORD_ARRAY_TYPE_EXT
			   params returns one value, the data type of the
			   coordinates in the texture coordinate array.	 See
			   glTexCoordPointerEXT.

  GL_TEXTURE_GEN_S	   params returns a single Boolean value indicating
			   whether automatic generation	of the S texture
			   coordinate is enabled.  See glTexGen.

  GL_TEXTURE_GEN_T	   params returns a single Boolean value indicating
			   whether automatic generation	of the T texture
			   coordinate is enabled.  See glTexGen.

  GL_TEXTURE_GEN_R	   params returns a single Boolean value indicating
			   whether automatic generation	of the R texture
			   coordinate is enabled.  See glTexGen.

  GL_TEXTURE_GEN_Q	   params returns a single Boolean value indicating
			   whether automatic generation	of the Q texture
			   coordinate is enabled.  See glTexGen.

  GL_TEXTURE_MATRIX	   params returns sixteen values: the texture matrix
			   on the top of the texture matrix stack.  See
			   glPushMatrix.

  GL_TEXTURE_STACK_DEPTH   params returns one value, the number	of matrices
			   on the texture matrix stack.	 See glPushMatrix.

  GL_UNPACK_ALIGNMENT	   params returns one value, the byte alignment	used
			   for reading pixel data from memory.	See
			   glPixelStore.

  GL_UNPACK_LSB_FIRST	   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.	See glPixelStore.

  GL_UNPACK_ROW_LENGTH	   params returns one value, the row length used for
			   reading pixel data from memory.  See	glPixelStore.

  GL_UNPACK_SKIP_PIXELS	   params returns one value, the number	of pixel
			   locations skipped before the	first pixel is read
			   from	memory.	 See glPixelStore.

  GL_UNPACK_SKIP_ROWS	   params returns one value, the number	of rows	of
			   pixel locations skipped before the first pixel is
			   read	from memory.  See glPixelStore.

  GL_UNPACK_SWAP_BYTES	   params returns a single Boolean value indicating
			   whether the bytes of	two-byte and four-byte pixel
			   indices and components are swapped after being
			   read	from memory.  See glPixelStore.

  GL_VERTEX_ARRAY_EXT	   params returns a single boolean value, indicating
			   whether the vertex array is enabled.	 See
			   glVertexPointerEXT.

  GL_VERTEX_ARRAY_COUNT_EXT
			   params returns one value, the number	of vertexes
			   in the vertex array,	counting from the first, that
			   are static.	See glVertexPointerEXT.

  GL_VERTEX_ARRAY_SIZE_EXT params returns one value, the number	of
			   coordinates per vertex in the vertex	array.	See
			   glVertexPointerEXT.

  GL_VERTEX_ARRAY_STRIDE_EXT
			   params returns one value, the byte offset between
			   consecutive vertexes	in the vertex array.  See
			   glVertexPointerEXT.

  GL_VERTEX_ARRAY_TYPE_EXT params returns one value, the data type of each
			   coordinate in the vertex array.  See
			   glVertexPointerEXT.

  GL_VIEWPORT		   params returns four values: the x and y window
			   coordinates of the viewport,	followed by its	width
			   and height.	See glViewport.

  GL_ZOOM_X		   params returns one value, the x pixel zoom factor.
			   See glPixelZoom.

  GL_ZOOM_Y		   params returns one value, the y pixel zoom factor.
			   See glPixelZoom.

  Many of the Boolean parameters can also be queried more easily using
  glIsEnabled.

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, glGetError, glGetLight, glGetMap, glGetMaterial,
  glGetPixelMap, glGetPolygonStipple, glGetString, glGetTexEnv,	glGetTexGen,
  glGetTexImage, glGetTexLevelParameter, glGetTexParameter, glIsEnabled




Introduction | Alphabetic | Specification

Last Edited: Fri Dec 6 11:18:03 EST 1996 by AFV
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