path: root/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/get.gl

_C_ License Applicability. Except to the extent portions of this file are
_C_ made subject to an alternative license as permitted in the SGI Free
_C_ Software License B, Version 1.1 (the "License"), the contents of this
_C_ file are subject only to the provisions of the License. You may not use
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_C_ http://oss.sgi.com/projects/FreeB
_C_ 
_C_ Note that, as provided in the License, the Software is distributed on an
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_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
_C_ 
_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
_C_ Copyright in any portions created by third parties is as indicated
_C_ elsewhere herein. All Rights Reserved.
_C_ 
_C_ Additional Notice Provisions: The application programming interfaces
_C_ established by SGI in conjunction with the Original Code are The
_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
_C_ published by SGI, but has not been independently verified as being
_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
_C_
_C_ The first character in this file must be an '_'!
_C_ Anything on a line after _C_ is ignored
_define(_filters,tbl|eqn)_C_
_C_      eqn is automatically replaced with neqn for nroff
_header(Get,return the value or values of a selected parameter)
_names(GetBooleanv)
_names(GetDoublev)
_names(GetFloatv)
_names(GetIntegerv)
.EQ
delim $$
.EN
.SH PARAMETERS
_phead(_param1)
Specifies the parameter value to be returned.
The symbolic constants in the list below are accepted.
_phead(_param2)
Returns the value or values of the specified parameter.
.SH DESCRIPTION
These four commands return values for simple state variables in GL. 
_param1 is a symbolic constant indicating the state variable to be returned, 
and _param2 is a pointer to an array of the indicated type in 
which to place the returned data.
.P
Type conversion is performed if _param2 has a different type than 
the state variable value being requested.
If _cmnd(GetBooleanv) is called,
a floating-point (or integer) value is converted to _const(FALSE) if 
and only if it is 0.0 (or 0).
Otherwise,
it is converted to _const(TRUE).
If _cmnd(GetIntegerv) is called, boolean values are returned as
_const(TRUE) or _const(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 _cmnd(GetFloatv) or _cmnd(GetDoublev) is called,
boolean values are returned as _const(TRUE) or _const(FALSE),
and integer values are converted to floating-point values.
.P
The following symbolic constants are accepted by _param1:
.TP 25
_const(ACCUM_ALPHA_BITS)
_param2 returns one value,
the number of alpha bitplanes in the accumulation buffer.
.TP
_const(ACCUM_BLUE_BITS)
_param2 returns one value,
the number of blue bitplanes in the accumulation buffer.
.TP
_const(ACCUM_CLEAR_VALUE)
_param2 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. The initial value is (0, 0, 0, 0). 
See _cmnd(ClearAccum).
.TP
_const(ACCUM_GREEN_BITS)
_param2 returns one value,
the number of green bitplanes in the accumulation buffer.
.TP
_const(ACCUM_RED_BITS)
_param2 returns one value,
the number of red bitplanes in the accumulation buffer.
.TP
_arbconst(ACTIVE_TEXTURE)
_param2 returns a single value indicating the active multitexture unit.
The initial value is _arbconst(TEXTURE0).
See _cmnd(ActiveTextureARB).
.TP
_const(ALIASED_POINT_SIZE_RANGE)
_param2 returns two values, 
the smallest and largest supported sizes for aliased points.
.TP
_const(ALIASED_LINE_WIDTH_RANGE)
_param2 returns two values, 
the smallest and largest supported widths for aliased lines.
.TP
_const(ALPHA_BIAS)
_param2 returns one value,
the alpha bias factor used during pixel transfers. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(ALPHA_BITS)
_param2 returns one value,
the number of alpha bitplanes in each color buffer.
.TP
_const(ALPHA_SCALE)
_param2 returns one value,
the alpha scale factor used during pixel transfers. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(ALPHA_TEST)
_param2 returns a single boolean value indicating whether alpha testing
of fragments is enabled. The initial value is _const(FALSE). 
See _cmnd(AlphaFunc).
.TP
_const(ALPHA_TEST_FUNC)
_param2 returns one value,
the symbolic name of the alpha test function. The initial value is
_const(ALWAYS). 
See _cmnd(AlphaFunc).
.TP
_const(ALPHA_TEST_REF)
_param2 returns one value,
the reference value for the alpha test. The initial value is 0. 
See _cmnd(AlphaFunc).
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.
.TP
_const(ATTRIB_STACK_DEPTH)
_param2 returns one value,
the depth of the attribute stack.
If the stack is empty,
0 is returned. The initial value is 0. 
See _cmnd(PushAttrib).
.TP
_const(AUTO_NORMAL)
_param2 returns a single boolean value indicating whether 2D map evaluation
automatically generates surface normals. The initial value is _const(FALSE). 
See _cmnd(Map2).
.TP
_const(AUX_BUFFERS)
_param2 returns one value,
the number of auxiliary color buffers. The initial value is 0.
.TP
_const(BLEND)
_param2 returns a single boolean value indicating whether blending is
enabled. The initial value is _const(FALSE). 
See _cmnd(BlendFunc).
.TP
_const(BLEND_COLOR)
_param2 returns four values,
the red, green, blue, and alpha values which are the components of
the blend color.
See _cmnd(BlendColor).
.TP
_const(BLEND_DST)
_param2 returns one value,
the symbolic constant identifying the destination blend
function. The initial value is _const(ZERO). 
See _cmnd(BlendFunc).
.TP
_const(BLEND_EQUATION)
_param2 returns one value, a symbolic constant indicating whether
the blend equation is _const(FUNC_ADD), _const(MIN) or 
_const(MAX). See _cmnd(BlendEquation).
.TP
_const(BLEND_SRC)
_param2 returns one value,
the symbolic constant identifying the source blend function. The initial
value is _const(ONE). 
See _cmnd(BlendFunc).
.TP
_const(BLUE_BIAS)
_param2 returns one value,
the blue bias factor used during pixel transfers. The initial value is 0.
See 
_cmnd(PixelTransfer).
.TP
_const(BLUE_BITS)
_param2 returns one value,
the number of blue bitplanes in each color buffer.
.TP
_const(BLUE_SCALE)
_param2 returns one value,
the blue scale factor used during pixel transfers. The initial value is 1.
See 
_cmnd(PixelTransfer).
.TP
_arbconst(CLIENT_ACTIVE_TEXTURE)
_param2 returns a single integer value indicating the current client active
multitexture unit. The initial value is _arbconst(TEXTURE0).
See _cmnd(ClientActiveTextureARB).
.TP
_const(CLIENT_ATTRIB_STACK_DEPTH)
_param2 returns one value indicating the depth of the
attribute stack. The initial value is 0.
See _cmnd(PushClientAttrib).
.TP
_const(CLIP_PLANE)\f2i\fP
_param2 returns a single boolean value indicating whether the specified
clipping plane is enabled. The initial value is _const(FALSE). 
See _cmnd(ClipPlane).
.TP
_const(COLOR_ARRAY)
_param2 returns a single boolean value indicating whether the color array is enabled. The initial value is _const(FALSE). 
See _cmnd(ColorPointer).
.TP
_const(COLOR_ARRAY_SIZE)
_param2 returns one value,
the number of components per color in the color array. The initial value
is 4. See _cmnd(ColorPointer). 
.TP
_const(COLOR_ARRAY_STRIDE)
_param2 returns one value,
the byte offset between consecutive colors in the color array. The initial
value is 0. 
See _cmnd(ColorPointer).
.TP
_const(COLOR_ARRAY_TYPE)
_param2 returns one value,
the data type of each component in the color array. The initial value
is _const(FLOAT). See _cmnd(ColorPointer). 
.TP
_const(COLOR_CLEAR_VALUE)
_param2 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. The initial value is (0, 0, 0, 0). 
See _cmnd(ClearColor).
.TP
_const(COLOR_LOGIC_OP)
_param2 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 _const(FALSE).
See _cmnd(LogicOp).
.TP
_const(COLOR_MATERIAL)
_param2 returns a single boolean value indicating whether one or more
material parameters are tracking the current color. The initial value
is _const(FALSE). 
See _cmnd(ColorMaterial).
.TP
_const(COLOR_MATERIAL_FACE)
_param2 returns one value,
a symbolic constant indicating which materials have a parameter that is
tracking the current color. The initial value is _const(FRONT_AND_BACK). 
See _cmnd(ColorMaterial).
.TP
_const(COLOR_MATERIAL_PARAMETER)
_param2 returns one value,
a symbolic constant indicating which material parameters are
tracking the current color. The initial value is
_const(AMBIENT_AND_DIFFUSE). 
See _cmnd(ColorMaterial).
.TP
_const(COLOR_MATRIX)
_param2 returns sixteen values:
the color matrix on the top of the color matrix stack. Initially
this matrix is the identity matrix. See _cmnd(PushMatrix).
.TP
_const(COLOR_MATRIX_STACK_DEPTH)
_param2 returns one value,
the maximum supported depth of the projection matrix stack. The value must
be at least 2.
See _cmnd(PushMatrix).
.TP
_const(COLOR_TABLE)
_param2 returns a single boolean value indicating whether the color table
lookup is enabled.
See _cmnd(ColorTable).
.TP
_const(COLOR_WRITEMASK)
_param2 returns four boolean values:
the red, green, blue, and alpha write enables for the color
buffers. The initial value is (_const(TRUE), _const(TRUE),
_const(TRUE), _const(TRUE)). 
See _cmnd(ColorMask).
.TP
_const(CONVOLUTION_1D)
_param2 returns a single boolean value indicating whether 1D convolution
is enabled. The initial value is _const(FALSE).
See _cmnd(ConvolutionFilter1D).
.TP
_const(CONVOLUTION_2D)
_param2 returns a single boolean value indicating whether 2D convolution
is enabled. The initial value is _const(FALSE).
See _cmnd(ConvolutionFilter2D).
.TP
_const(CULL_FACE)
_param2 returns a single boolean value indicating whether polygon culling
is enabled. The initial value is _const(FALSE). 
See _cmnd(CullFace).
.TP
_const(CULL_FACE_MODE)
_param2 returns one value,
a symbolic constant indicating which polygon faces are to be
culled. The initial value is _const(BACK). 
See _cmnd(CullFace).
.TP
_const(CURRENT_COLOR)
_param2 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 _cmnd(Color). The initial value is (1, 1, 1, 1). 
.TP
_const(CURRENT_INDEX)
_param2 returns one value,
the current color index. The initial value is 1. 
See _cmnd(Index).
.TP
_const(CURRENT_NORMAL)
_param2 returns three values:
the \f2x\fP, \f2y\fP, and \f2z\fP 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.
The initial value is (0, 0, 1). See _cmnd(Normal).
.TP
_const(CURRENT_RASTER_COLOR)
_param2 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. The initial value is (1, 1, 1, 1). 
See _cmnd(RasterPos).
.TP
_const(CURRENT_RASTER_DISTANCE)
_param2 returns one value,
the distance from the eye to the current raster position. The initial
value is 0.
See _cmnd(RasterPos).
.TP
_const(CURRENT_RASTER_INDEX)
_param2 returns one value,
the color index of the current raster position. The initial value is 1. 
See _cmnd(RasterPos).
.TP
_const(CURRENT_RASTER_POSITION)
_param2 returns four values:
the \f2x\fP, \f2y\fP, \f2z\fP, and \f2w\fP components of the current
raster position.
\f2x\fP, \f2y\fP, and \f2z\fP are in window coordinates,
and \f2w\fP is in clip coordinates. The initial value is (0, 0, 0, 1). 
See _cmnd(RasterPos).
.TP
_const(CURRENT_RASTER_POSITION_VALID)
_param2 returns a single boolean value indicating whether the current
raster position is valid. The initial value is _const(TRUE).
See _cmnd(RasterPos).
.TP
_const(CURRENT_RASTER_TEXTURE_COORDS)
_param2 returns four values:
the \f2s\fP, \f2t\fP, \f2r\fP, and \f2q\fP
current raster texture coordinates. The initial value is (0, 0, 0, 1).
See _cmnd(RasterPos) and _cmnd(TexCoord).
.TP
_const(CURRENT_TEXTURE_COORDS)
_param2 returns four values:
the \f2s\fP, \f2t\fP, \f2r\fP, and \f2q\fP current texture
coordinates. The initial value is (0, 0, 0, 1).
See
_cmnd(TexCoord).
.TP
_const(DEPTH_BIAS)
_param2 returns one value,
the depth bias factor used during pixel transfers. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(DEPTH_BITS)
_param2 returns one value,
the number of bitplanes in the depth buffer.
.TP
_const(DEPTH_CLEAR_VALUE)
_param2 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. The initial value is 1. 
See _cmnd(ClearDepth). 
.TP
_const(DEPTH_FUNC)
_param2 returns one value,
the symbolic constant that indicates the depth comparison
function. The initial value is _const(LESS). 
See _cmnd(DepthFunc).
.TP
_const(DEPTH_RANGE)
_param2 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. The initial value is (0, 1).
See _cmnd(DepthRange).
.TP
_const(DEPTH_SCALE)
_param2 returns one value,
the depth scale factor used during pixel transfers. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(DEPTH_TEST)
_param2 returns a single boolean value indicating whether depth testing
of fragments is enabled. The initial value is _const(FALSE). 
See _cmnd(DepthFunc) and _cmnd(DepthRange).
.TP
_const(DEPTH_WRITEMASK)
_param2 returns a single boolean value indicating if the depth buffer
is enabled for writing. The initial value is _const(TRUE). 
See _cmnd(DepthMask).
.TP
_const(DITHER)
_param2 returns a single boolean value indicating whether dithering of
fragment colors and indices is enabled. The initial value is _const(TRUE). 
.TP
_const(DOUBLEBUFFER)
_param2 returns a single boolean value indicating whether double buffering
is supported.
.TP
_const(DRAW_BUFFER)
_param2 returns one value,
a symbolic constant indicating which buffers are being drawn to. 
See _cmnd(DrawBuffer). The initial value is _const(BACK) if there
are back buffers, otherwise it is _const(FRONT).
.TP
_const(EDGE_FLAG)
_param2 returns a single boolean value indicating whether the current
edge flag is _const(TRUE) or _const(FALSE). The initial value is _const(TRUE). 
See _cmnd(EdgeFlag). 
.TP
_const(EDGE_FLAG_ARRAY)
_param2 returns a single boolean value indicating whether the edge
flag array is enabled. The initial value is _const(FALSE). 
See _cmnd(EdgeFlagPointer).
.TP
_const(EDGE_FLAG_ARRAY_STRIDE)
_param2 returns one value,
the byte offset between consecutive edge flags in the edge flag
array. The initial value is 0.
See _cmnd(EdgeFlagPointer).
.TP
_const(FEEDBACK_BUFFER_SIZE)
_param2 returns one value, the size of the feedback buffer.  See
_cmnd(FeedbackBuffer).
.TP
_const(FEEDBACK_BUFFER_TYPE)
_param2 returns one value, the type of the feedback buffer.  See
_cmnd(FeedbackBuffer).
.TP
_const(FOG)
_param2 returns a single boolean value indicating whether fogging is
enabled. The initial value is _const(FALSE). 
See _cmnd(Fog).
.TP
_const(FOG_COLOR)
_param2 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 _cmnd(Fog).
.TP
_const(FOG_DENSITY)
_param2 returns one value,
the fog density parameter. The initial value is 1. 
See _cmnd(Fog).
.TP
_const(FOG_END)
_param2 returns one value,
the end factor for the linear fog equation. The initial value is 1. 
See _cmnd(Fog).
.TP
_const(FOG_HINT)
_param2 returns one value,
a symbolic constant indicating the mode of the fog hint. The initial value
is _const(DONT_CARE).
See _cmnd(Hint).
.TP
_const(FOG_INDEX)
_param2 returns one value,
the fog color index. The initial value is 0. 
See _cmnd(Fog).
.TP
_const(FOG_MODE)
_param2 returns one value,
a symbolic constant indicating which fog equation is selected. The initial
value is _const(EXP). 
See _cmnd(Fog).
.TP
_const(FOG_START)
_param2 returns one value,
the start factor for the linear fog equation. The initial value is 0. 
See _cmnd(Fog).
.TP
_const(FRONT_FACE)
_param2 returns one value,
a symbolic constant indicating whether clockwise or counterclockwise
polygon winding is treated as front-facing. The initial value is
_const(CCW). 
See _cmnd(FrontFace).
.TP
_const(GREEN_BIAS)
_param2 returns one value,
the green bias factor used during pixel transfers. The initial value is 0.
.TP
_const(GREEN_BITS)
_param2 returns one value,
the number of green bitplanes in each color buffer.
.TP
_const(GREEN_SCALE)
_param2 returns one value,
the green scale factor used during pixel transfers. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(HISTOGRAM)
_param2 returns a single boolean value indicating whether histogram is
enabled. The initial value is _const(FALSE).
See _cmnd(Histogram).
.TP
_const(INDEX_ARRAY)
_param2 returns a single boolean value indicating whether the color
index array is enabled. The initial value is _const(FALSE). 
See _cmnd(IndexPointer).
.TP
_const(INDEX_ARRAY_STRIDE)
_param2 returns one value,
the byte offset between consecutive color indexes in the color index
array. The initial value is 0. 
See _cmnd(IndexPointer).
.TP
_const(INDEX_ARRAY_TYPE)
_param2 returns one value,
the data type of indexes in the color index array. The initial value is
_const(FLOAT). 
See _cmnd(IndexPointer).
.TP
_const(INDEX_BITS)
_param2 returns one value,
the number of bitplanes in each color index buffer.
.TP
_const(INDEX_CLEAR_VALUE)
_param2 returns one value,
the color index used to clear the color index buffers. The initial value
is 0. 
See _cmnd(ClearIndex).
.TP
_const(INDEX_LOGIC_OP)
_param2 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 _const(FALSE). 
See _cmnd(LogicOp).
.TP
_const(INDEX_MODE)
_param2 returns a single boolean value indicating whether the GL is in
color index mode (_const(TRUE)) or RGBA mode (_const(FALSE)).
.TP
_const(INDEX_OFFSET)
_param2 returns one value,
the offset added to color and stencil indices during pixel
transfers. The initial value is 0. 
See _cmnd(PixelTransfer).
.TP
_const(INDEX_SHIFT)
_param2 returns one value,
the amount that color and stencil indices are shifted during pixel
transfers. The initial value is 0. 
See _cmnd(PixelTransfer).
.TP
_const(INDEX_WRITEMASK)
_param2 returns one value,
a mask indicating which bitplanes of each color index buffer can be
written. The initial value is all 1's. 
See _cmnd(IndexMask).
.TP
_const(LIGHT)\f2i\fP
_param2 returns a single boolean value indicating whether the specified
light is enabled. The initial value is _const(FALSE). 
See _cmnd(Light) and _cmnd(LightModel).
.TP
_const(LIGHTING)
_param2 returns a single boolean value indicating whether lighting is
enabled. The initial value is _const(FALSE). 
See _cmnd(LightModel).
.TP
_const(LIGHT_MODEL_AMBIENT)
_param2 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 _cmnd(LightModel).
.TP
_const(LIGHT_MODEL_COLOR_CONTROL)
_param2 returns single enumerated value indicating whether specular
reflection calculations are separated from normal lighting computations.
The initial value is _const(SINGLE_COLOR).
.TP
_const(LIGHT_MODEL_LOCAL_VIEWER)
_param2 returns a single boolean value indicating whether specular reflection
calculations treat the viewer as being local to the scene. The initial
value is _const(FALSE). 
See _cmnd(LightModel).
.TP
_const(LIGHT_MODEL_TWO_SIDE)
_param2 returns a single boolean value indicating whether separate materials
are used to compute lighting for front- and back-facing
polygons. The initial value is _const(FALSE). 
See _cmnd(LightModel).
.TP
_const(LINE_SMOOTH)
_param2 returns a single boolean value indicating whether antialiasing of
lines is enabled. The initial value is _const(FALSE). 
See _cmnd(LineWidth).
.TP
_const(LINE_SMOOTH_HINT)
_param2 returns one value,
a symbolic constant indicating the mode of the line antialiasing
hint. The initial value is _const(DONT_CARE). 
See _cmnd(Hint).
.TP
_const(LINE_STIPPLE)
_param2 returns a single boolean value indicating whether stippling of lines
is enabled. The initial value is _const(FALSE).
See _cmnd(LineStipple).
.TP
_const(LINE_STIPPLE_PATTERN)
_param2 returns one value,
the 16-bit line stipple pattern. The initial value is all 1's. 
See _cmnd(LineStipple).
.TP
_const(LINE_STIPPLE_REPEAT)
_param2 returns one value,
the line stipple repeat factor. The initial value is 1. 
See _cmnd(LineStipple).
.TP
_const(LINE_WIDTH)
_param2 returns one value,
the line width as specified with _cmnd(LineWidth). The initial value is
1. 
.TP
_const(LINE_WIDTH_GRANULARITY)
_param2 returns one value,
the width difference between adjacent supported widths for antialiased lines.
See _cmnd(LineWidth).
.TP
_const(LINE_WIDTH_RANGE)
_param2 returns two values:
the smallest and largest supported widths for antialiased
lines. 
See _cmnd(LineWidth).
.TP
_const(LIST_BASE)
_param2 returns one value,
the base offset added to all names in arrays presented to
_cmnd(CallLists). The initial value is 0. 
See _cmnd(ListBase).
.TP
_const(LIST_INDEX)
_param2 returns one value,
the name of the display list currently under construction.
0 is returned if no display list is currently under
construction. The initial value is 0.
See _cmnd(NewList).
.TP
_const(LIST_MODE)
_param2 returns one value,
a symbolic constant indicating the construction mode of the display list
currently under construction. The initial value is 0.
See _cmnd(NewList).
.TP
_const(LOGIC_OP_MODE)
_param2 returns one value,
a symbolic constant indicating the selected logic operation
mode. The initial value is _const(COPY). 
See _cmnd(LogicOp).
.TP
_const(MAP1_COLOR_4)
_param2 returns a single boolean value indicating whether
1D evaluation generates colors. The initial value is _const(FALSE).
See _cmnd(Map1).
.TP
_const(MAP1_GRID_DOMAIN)
_param2 returns two values:
the endpoints of the 1D map's grid domain. The initial value is (0, 1). 
See _cmnd(MapGrid).
.TP
_const(MAP1_GRID_SEGMENTS)
_param2 returns one value,
the number of partitions in the 1D map's grid domain. The initial value
is 1. 
See _cmnd(MapGrid).
.TP
_const(MAP1_INDEX)
_param2 returns a single boolean value indicating whether
1D evaluation generates color indices. The initial value is _const(FALSE).
See _cmnd(Map1).
.TP
_const(MAP1_NORMAL)
_param2 returns a single boolean value indicating whether
1D evaluation generates normals. The initial value is _const(FALSE).
See _cmnd(Map1).
.TP
_const(MAP1_TEXTURE_COORD_1)
_param2 returns a single boolean value indicating whether
1D evaluation generates 1D texture coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map1).
.TP
_const(MAP1_TEXTURE_COORD_2)
_param2 returns a single boolean value indicating whether
1D evaluation generates 2D texture coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map1).
.TP
_const(MAP1_TEXTURE_COORD_3)
_param2 returns a single boolean value indicating whether
1D evaluation generates 3D texture coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map1).
.TP
_const(MAP1_TEXTURE_COORD_4)
_param2 returns a single boolean value indicating whether
1D evaluation generates 4D texture coordinates. The initial value is
_const(FALSE).
See _cmnd(Map1).
.TP
_const(MAP1_VERTEX_3)
_param2 returns a single boolean value indicating whether
1D evaluation generates 3D vertex coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map1).
.TP
_const(MAP1_VERTEX_4)
_param2 returns a single boolean value indicating whether
1D evaluation generates 4D vertex coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map1).
.TP
_const(MAP2_COLOR_4)
_param2 returns a single boolean value indicating whether
2D evaluation generates colors. The initial value is _const(FALSE).
See _cmnd(Map2).
.TP
_const(MAP2_GRID_DOMAIN)
_param2 returns four values:
the endpoints of the 2D map's $i$ and $j$ grid domains. The initial value
is (0,1; 0,1). 
See _cmnd(MapGrid).
.TP
_const(MAP2_GRID_SEGMENTS)
_param2 returns two values:
the number of partitions in the 2D map's $i$ and $j$ grid
domains. The initial value is (1,1). 
See _cmnd(MapGrid).
.TP
_const(MAP2_INDEX)
_param2 returns a single boolean value indicating whether
2D evaluation generates color indices. The initial value is _const(FALSE).
See _cmnd(Map2).
.TP
_const(MAP2_NORMAL)
_param2 returns a single boolean value indicating whether
2D evaluation generates normals. The initial value is _const(FALSE).
See _cmnd(Map2).
.TP
_const(MAP2_TEXTURE_COORD_1)
_param2 returns a single boolean value indicating whether
2D evaluation generates 1D texture coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map2).
.TP
_const(MAP2_TEXTURE_COORD_2)
_param2 returns a single boolean value indicating whether
2D evaluation generates 2D texture coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map2).
.TP
_const(MAP2_TEXTURE_COORD_3)
_param2 returns a single boolean value indicating whether
2D evaluation generates 3D texture coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map2).
.TP
_const(MAP2_TEXTURE_COORD_4)
_param2 returns a single boolean value indicating whether
2D evaluation generates 4D texture coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map2).
.TP
_const(MAP2_VERTEX_3)
_param2 returns a single boolean value indicating whether
2D evaluation generates 3D vertex coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map2).
.TP
_const(MAP2_VERTEX_4)
_param2 returns a single boolean value indicating whether
2D evaluation generates 4D vertex coordinates. The initial value is
_const(FALSE). 
See _cmnd(Map2).
.TP
_const(MAP_COLOR)
_param2 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 _const(FALSE). 
See _cmnd(PixelTransfer).
.TP
_const(MAP_STENCIL)
_param2 returns a single boolean value indicating if stencil indices
are to be replaced by table lookup during pixel transfers. The initial
value is _const(FALSE). 
See _cmnd(PixelTransfer).
.TP
_const(MATRIX_MODE)
_param2 returns one value,
a symbolic constant indicating which matrix stack is currently the
target of all matrix operations. The initial value is _const(MODELVIEW).
See _cmnd(MatrixMode).
.TP
_const(MAX_3D_TEXTURE_SIZE)
_param2 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
_const(PROXY_TEXTURE_3D) to determine if a texture is too large.
See _cmnd(TexImage3D).
.TP
_const(MAX_CLIENT_ATTRIB_STACK_DEPTH)
_param2 returns one value indicating the maximum supported depth
of the client attribute stack.
See _cmnd(PushClientAttrib).
.TP
_const(MAX_ATTRIB_STACK_DEPTH)
_param2 returns one value,
the maximum supported depth of the attribute stack. The value must be at least 16.
See _cmnd(PushAttrib).
.TP
_const(MAX_CLIP_PLANES)
_param2 returns one value,
the maximum number of application-defined clipping planes. The value must be at least 6.
See _cmnd(ClipPlane).
.TP
_const(MAX_COLOR_MATRIX_STACK_DEPTH)
_param2 returns one value, the maximum supported depth of the color matrix
stack.  The value must be at least 2.
See _cmnd(PushMatrix).
.TP
_const(MAX_ELEMENTS_INDICES)
_param2 returns one value,
the recommended maximum number of vertex array indices.  See _cmnd(DrawRangeElements).
.TP
_const(MAX_ELEMENTS_VERTICES)
_param2 returns one value,
the recommended maximum number of vertex array vertices.  See _cmnd(DrawRangeElements).
.TP
_const(MAX_EVAL_ORDER)
_param2 returns one value,
the maximum equation order supported by 1D and 2D
evaluators. The value must be at least 8.
See _cmnd(Map1) and _cmnd(Map2).
.TP
_const(MAX_LIGHTS)
_param2 returns one value,
the maximum number of lights. The value must be at least 8.
See _cmnd(Light).
.TP
_const(MAX_LIST_NESTING)
_param2 returns one value,
the maximum recursion depth allowed during display-list
traversal. The value must be at least 64.
See _cmnd(CallList).
.TP
_const(MAX_MODELVIEW_STACK_DEPTH)
_param2 returns one value,
the maximum supported depth of the modelview matrix stack. The value must
be at least 32.
See _cmnd(PushMatrix).
.TP
_const(MAX_NAME_STACK_DEPTH)
_param2 returns one value,
the maximum supported depth of the selection name stack. The value must be at least 64.
See _cmnd(PushName).
.TP
_const(MAX_PIXEL_MAP_TABLE)
_param2 returns one value,
the maximum supported size of a _cmnd(PixelMap) lookup table. 
The value must be at least 32.
See _cmnd(PixelMap).
.TP
_const(MAX_PROJECTION_STACK_DEPTH)
_param2 returns one value,
the maximum supported depth of the projection matrix stack. The value must be at least 2.
See _cmnd(PushMatrix).
.TP
_const(MAX_TEXTURE_SIZE)
_param2 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
_const(PROXY_TEXTURE_1D) or _const(PROXY_TEXTURE_2D)
to determine if a texture is too large.
See _cmnd(TexImage1D) and _cmnd(TexImage2D).
.TP
_const(MAX_TEXTURE_STACK_DEPTH)
_param2 returns one value,
the maximum supported depth of the texture matrix stack. The value must be at least 2.
See _cmnd(PushMatrix).
.TP
_arbconst(MAX_TEXTURE_UNITS)
_param2 returns a single value indicating the number of texture units
supported. The value must be at least 1.
See _cmnd(ActiveTextureARB).
.TP
_const(MAX_VIEWPORT_DIMS)
_param2 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 _cmnd(Viewport).
.TP
_const(MINMAX)
_param2 returns a single boolean value indicating whether pixel minmax
values are computed.  The initial value is _const(FALSE).
See _cmnd(Minmax).
.TP
_const(MODELVIEW_MATRIX)
_param2 returns sixteen values:
the modelview matrix on the top of the modelview matrix stack. Initially
this matrix is the identity matrix. See _cmnd(PushMatrix).
.TP
_const(MODELVIEW_STACK_DEPTH)
_param2 returns one value,
the number of matrices on the modelview matrix stack.
The initial value is 1.
See _cmnd(PushMatrix).
.TP
_const(NAME_STACK_DEPTH)
_param2 returns one value,
the number of names on the selection name stack. The initial value is 0. 
See _cmnd(PushName).
.TP
_const(NORMAL_ARRAY)
_param2 returns a single boolean value, indicating whether the normal
array is enabled. The initial value is _const(FALSE). 
See _cmnd(NormalPointer).
.TP
_const(NORMAL_ARRAY_STRIDE)
_param2 returns one value,
the byte offset between consecutive normals in the normal
array. The initial value is 0. 
See _cmnd(NormalPointer).
.TP
_const(NORMAL_ARRAY_TYPE)
_param2 returns one value,
the data type of each coordinate in the normal array. The initial value is
_const(FLOAT). 
See _cmnd(NormalPointer).
.TP
_const(NORMALIZE)
_param2 returns a single boolean value indicating whether normals are
automatically scaled to unit length after they have been transformed to
eye coordinates. The initial value is _const(FALSE). 
See _cmnd(Normal).
.TP
_const(PACK_ALIGNMENT)
_param2 returns one value,
the byte alignment used for writing pixel data to memory. The initial
value is 4. 
See _cmnd(PixelStore).
.TP
_const(PACK_IMAGE_HEIGHT)
_param2 returns one value,
the image height used for writing pixel data to memory.  The initial
value is 0.
See _cmnd(PixelStore).
.TP
_const(PACK_LSB_FIRST)
_param2 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. The initial value is _const(FALSE). 
See _cmnd(PixelStore).
.TP
_const(PACK_ROW_LENGTH)
_param2 returns one value,
the row length used for writing pixel data to memory. The initial value is
0. 
See _cmnd(PixelStore).
.TP
_const(PACK_SKIP_IMAGES)
_param2 returns one value,
the number of pixel images skipped before the first pixel is written
into memory. The initial value is 0. 
See _cmnd(PixelStore).
.TP
_const(PACK_SKIP_PIXELS)
_param2 returns one value,
the number of pixel locations skipped before the first pixel is written
into memory. The initial value is 0. 
See _cmnd(PixelStore).
.TP
_const(PACK_SKIP_ROWS)
_param2 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 _cmnd(PixelStore).
.TP
_const(PACK_SWAP_BYTES)
_param2 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. The initial value is _const(FALSE). 
See _cmnd(PixelStore).
.TP
_const(PERSPECTIVE_CORRECTION_HINT)
_param2 returns one value,
a symbolic constant indicating the mode of the perspective correction
hint. The initial value is _const(DONT_CARE). 
See _cmnd(Hint).
.TP
_const(PIXEL_MAP_A_TO_A_SIZE)
_param2 returns one value,
the size of the alpha-to-alpha pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_B_TO_B_SIZE)
_param2 returns one value,
the size of the blue-to-blue pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_G_TO_G_SIZE)
_param2 returns one value,
the size of the green-to-green pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_I_TO_A_SIZE)
_param2 returns one value,
the size of the index-to-alpha pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_I_TO_B_SIZE)
_param2 returns one value,
the size of the index-to-blue pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_I_TO_G_SIZE)
_param2 returns one value,
the size of the index-to-green pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_I_TO_I_SIZE)
_param2 returns one value,
the size of the index-to-index pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_I_TO_R_SIZE)
_param2 returns one value,
the size of the index-to-red pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_R_TO_R_SIZE)
_param2 returns one value,
the size of the red-to-red pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(PIXEL_MAP_S_TO_S_SIZE)
_param2 returns one value,
the size of the stencil-to-stencil pixel translation table.
The initial value is 1.
See _cmnd(PixelMap).
.TP
_const(POINT_SIZE)
_param2 returns one value,
the point size as specified by _cmnd(PointSize). The initial value is 1. 
.TP
_const(POINT_SIZE_GRANULARITY)
_param2 returns one value,
the size difference between adjacent supported sizes for antialiased points.
See _cmnd(PointSize).
.TP
_const(POINT_SIZE_RANGE)
_param2 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 _cmnd(PointSize).
.TP
_const(POINT_SMOOTH)
_param2 returns a single boolean value indicating whether antialiasing of
points is enabled. The initial value is _const(FALSE). 
See _cmnd(PointSize).
.TP
_const(POINT_SMOOTH_HINT)
_param2 returns one value,
a symbolic constant indicating the mode of the point antialiasing
hint. The initial value is _const(DONT_CARE).
See _cmnd(Hint).
.TP
_const(POLYGON_MODE)
_param2 returns two values:
symbolic constants indicating whether front-facing and back-facing polygons
are rasterized as points, lines, or filled polygons. The initial value is
_const(FILL). 
See _cmnd(PolygonMode).
.TP
_const(POLYGON_OFFSET_FACTOR)
_param2 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
rasterized. The initial value is 0. 
See _cmnd(PolygonOffset).
.TP
_const(POLYGON_OFFSET_UNITS)
_param2 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 _cmnd(PolygonOffset).
.TP
_const(POLYGON_OFFSET_FILL)
_param2 returns a single boolean value indicating whether polygon offset
is enabled for polygons in fill mode. The initial value is _const(FALSE).
See _cmnd(PolygonOffset).
.TP
_const(POLYGON_OFFSET_LINE)
_param2 returns a single boolean value indicating whether polygon offset
is enabled for polygons in line mode. The initial value is _const(FALSE).
See _cmnd(PolygonOffset).
.TP
_const(POLYGON_OFFSET_POINT)
_param2 returns a single boolean value indicating whether polygon offset
is enabled for polygons in point mode. The initial value is _const(FALSE). 
See _cmnd(PolygonOffset).
.TP
_const(POLYGON_SMOOTH)
_param2 returns a single boolean value indicating whether antialiasing of
polygons is enabled. The initial value is _const(FALSE). 
See _cmnd(PolygonMode).
.TP
_const(POLYGON_SMOOTH_HINT)
_param2 returns one value,
a symbolic constant indicating the mode of the polygon antialiasing
hint. The initial value is _const(DONT_CARE).
See _cmnd(Hint).
.TP
_const(POLYGON_STIPPLE)
_param2 returns a single boolean value indicating whether polygon
stippling is enabled. The initial value is _const(FALSE). 
See _cmnd(PolygonStipple).
.TP
_const(POST_COLOR_MATRIX_COLOR_TABLE)
_param2 returns a single boolean value indicating whether post color
matrix transformation lookup is enabled. The initial value is
_const(FALSE).
See _cmnd(ColorTable).
.TP
_const(POST_COLOR_MATRIX_RED_BIAS)
_param2 returns one value, the red bias factor applied to RGBA fragments
after color matrix transformations. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(POST_COLOR_MATRIX_GREEN_BIAS)
_param2 returns one value, the green bias factor applied to RGBA fragments
after color matrix transformations. The initial value is 0.
See _cmnd(PixelTransfer)
.TP
_const(POST_COLOR_MATRIX_BLUE_BIAS)
_param2 returns one value, the blue bias factor applied to RGBA fragments
after color matrix transformations. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(POST_COLOR_MATRIX_ALPHA_BIAS)
_param2 returns one value, the alpha bias factor applied to RGBA fragments
after color matrix transformations. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(POST_COLOR_MATRIX_RED_SCALE)
_param2 returns one value, the red scale factor applied to RGBA fragments
after color matrix transformations. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(POST_COLOR_MATRIX_GREEN_SCALE)
_param2 returns one value, the green scale factor applied to RGBA fragments
after color matrix transformations. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(POST_COLOR_MATRIX_BLUE_SCALE)
_param2 returns one value, the blue scale factor applied to RGBA fragments
after color matrix transformations. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(POST_COLOR_MATRIX_ALPHA_SCALE)
_param2 returns one value, the alpha scale factor applied to RGBA fragments
after color matrix transformations. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(POST_CONVOLUTION_COLOR_TABLE)
_param2 returns a single boolean value indicating whether post convolution
lookup is enabled. The initial value is _const(FALSE).
See _cmnd(ColorTable).
.TP
_const(POST_CONVOLUTION_RED_BIAS)
_param2 returns one value, the red bias factor applied to RGBA fragments
after convolution. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(POST_CONVOLUTION_GREEN_BIAS)
_param2 returns one value, the green bias factor applied to RGBA fragments
after convolution. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(POST_CONVOLUTION_BLUE_BIAS)
_param2 returns one value, the blue bias factor applied to RGBA fragments
after convolution. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(POST_CONVOLUTION_ALPHA_BIAS)
_param2 returns one value, the alpha bias factor applied to RGBA fragments
after convolution. The initial value is 0.
See _cmnd(PixelTransfer).
.TP
_const(POST_CONVOLUTION_RED_SCALE)
_param2 returns one value, the red scale factor applied to RGBA fragments
after convolution. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(POST_CONVOLUTION_GREEN_SCALE)
_param2 returns one value, the green scale factor applied to RGBA fragments
after convolution. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(POST_CONVOLUTION_BLUE_SCALE)
_param2 returns one value, the blue scale factor applied to RGBA fragments
after convolution. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(POST_CONVOLUTION_ALPHA_SCALE)
_param2 returns one value, the alpha scale factor applied to RGBA fragments
after convolution. The initial value is 1.
See _cmnd(PixelTransfer).
.TP
_const(PROJECTION_MATRIX)
_param2 returns sixteen values:
the projection matrix on the top of the projection matrix
stack. Initially this matrix is the identity matrix.
See _cmnd(PushMatrix).
.TP
_const(PROJECTION_STACK_DEPTH)
_param2 returns one value,
the number of matrices on the projection matrix stack.
The initial value is 1.
See _cmnd(PushMatrix).
.TP
_const(READ_BUFFER)
_param2 returns one value,
a symbolic constant indicating which color buffer is selected for
reading. The initial value is _const(BACK) if there is a back buffer,
otherwise it is _const(FRONT).
See
_cmnd(ReadPixels) and _cmnd(Accum).
.TP
_const(RED_BIAS)
_param2 returns one value,
the red bias factor used during pixel transfers. The initial value is 0.
.TP
_const(RED_BITS)
_param2 returns one value,
the number of red bitplanes in each color buffer.
.TP
_const(RED_SCALE)
_param2 returns one value,
the red scale factor used during pixel transfers. The initial value is 1. 
See _cmnd(PixelTransfer).
.TP
_const(RENDER_MODE)
_param2 returns one value,
a symbolic constant indicating whether the GL is in render,
select,
or feedback mode. The initial value is _const(RENDER). 
See _cmnd(RenderMode).
.TP
_const(RESCALE_NORMAL)
_param2 returns single boolean value
indicating whether normal rescaling is enabled.
See _cmnd(Enable).
.TP
_const(RGBA_MODE)
_param2 returns a single boolean value indicating whether the GL is in RGBA
mode (true) or color index mode (false).
See _cmnd(Color).
.TP
_const(SCISSOR_BOX)
_param2 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 _cmnd(Scissor).
.TP
_const(SCISSOR_TEST)
_param2 returns a single boolean value indicating whether scissoring is
enabled. The initial value is _const(FALSE).
See _cmnd(Scissor).
.TP
_const(SELECTION_BUFFER_SIZE)
_param2 return one value,
the size of the selection buffer.
See _cmnd(SelectBuffer).
.TP
_const(SEPARABLE_2D)
_param2 returns a single boolean value indicating whether 2D separable
convolution is enabled. The initial value is _const(FALSE).
See _cmnd(SeparableFilter2D).
.TP
_const(SHADE_MODEL)
_param2 returns one value,
a symbolic constant indicating whether the shading mode is flat or
smooth. The initial value is _const(SMOOTH). 
See _cmnd(ShadeModel).
.TP
_const(SMOOTH_LINE_WIDTH_RANGE)
_param2 returns two values,
the smallest and largest supported widths for antialiased lines.
See _cmnd(LineWidth).
.TP
_const(SMOOTH_LINE_WIDTH_GRANULARITY)
_param2 returns one value,
the granularity of widths for antialiased lines.
See _cmnd(LineWidth).
.TP
_const(SMOOTH_POINT_SIZE_RANGE)
_param2 returns two values,
the smallest and largest supported widths for antialiased points.
See _cmnd(PointSize).
.TP
_const(SMOOTH_POINT_SIZE_GRANULARITY)
_param2 returns one value,
the granularity of sizes for antialiased points.
See _cmnd(PointSize).
.TP
_const(STENCIL_BITS)
_param2 returns one value,
the number of bitplanes in the stencil buffer.
.TP
_const(STENCIL_CLEAR_VALUE)
_param2 returns one value,
the index to which the stencil bitplanes are cleared. The initial value is
0. 
See _cmnd(ClearStencil).
.TP
_const(STENCIL_FAIL)
_param2 returns one value,
a symbolic constant indicating what action is taken when the stencil
test fails. The initial value is _const(KEEP). 
See _cmnd(StencilOp).
.TP
_const(STENCIL_FUNC)
_param2 returns one value,
a symbolic constant indicating what function is used to compare the
stencil reference value with the stencil buffer value. The initial value
is _const(ALWAYS). 
See _cmnd(StencilFunc).
.TP
_const(STENCIL_PASS_DEPTH_FAIL)
_param2 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 _const(KEEP). 
See _cmnd(StencilOp).
.TP
_const(STENCIL_PASS_DEPTH_PASS)
_param2 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 _const(KEEP). 
See _cmnd(StencilOp).
.TP
_const(STENCIL_REF)
_param2 returns one value,
the reference value that is compared with the contents of the stencil
buffer. The initial value is 0. 
See _cmnd(StencilFunc).
.TP
_const(STENCIL_TEST)
_param2 returns a single boolean value indicating whether stencil testing
of fragments is enabled. The initial value is _const(FALSE).
See _cmnd(StencilFunc) and _cmnd(StencilOp).
.TP
_const(STENCIL_VALUE_MASK)
_param2 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 _cmnd(StencilFunc).
.TP
_const(STENCIL_WRITEMASK)
_param2 returns one value,
the mask that controls writing of the stencil bitplanes. The initial value
is all 1's. See _cmnd(StencilMask).
.TP
_const(STEREO)
_param2 returns a single boolean value indicating whether stereo buffers
(left and right) are supported.
.TP
_const(SUBPIXEL_BITS)
_param2 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
.br
is 4.
.TP
_const(TEXTURE_1D)
_param2 returns a single boolean value indicating whether 1D texture
mapping is enabled. The initial value is _const(FALSE).
See _cmnd(TexImage1D).
.TP
_const(TEXTURE_BINDING_1D)
_param2 returns a single value, the name of the texture
currently bound to the target _const(TEXTURE_1D). The initial value is 0.
See _cmnd(BindTexture).
.TP
_const(TEXTURE_2D)
_param2 returns a single boolean value indicating whether 2D texture
mapping is enabled. The initial value is _const(FALSE).
See _cmnd(TexImage2D).
.TP
_const(TEXTURE_BINDING_2D)
_param2 returns a single value, the name of the texture
currently bound to the target _const(TEXTURE_2D). The initial value is 0.
See _cmnd(BindTexture).
.TP
_const(TEXTURE_3D)
_param2 returns a single boolean value indicating whether 3D texture
mapping is enabled. The initial value is _const(FALSE).
See _cmnd(TexImage3D).
.TP
_const(TEXTURE_BINDING_3D)
_param2 returns a single value, the name of the texture
currently bound to the target _const(TEXTURE_3D). The initial value is 0.
See _cmnd(BindTexture).
.TP
_const(TEXTURE_COORD_ARRAY)
_param2 returns a single boolean value indicating whether the texture
coordinate array is enabled. The initial value is _const(FALSE). 
See _cmnd(TexCoordPointer).
.TP
_const(TEXTURE_COORD_ARRAY_SIZE)
_param2 returns one value,
the number of coordinates per element in the texture coordinate
array. The initial value is 4. 
See _cmnd(TexCoordPointer).
.TP
_const(TEXTURE_COORD_ARRAY_STRIDE)
_param2 returns one value,
the byte offset between consecutive elements in the texture coordinate
array. The initial value is 0. 
See _cmnd(TexCoordPointer).
.TP
_const(TEXTURE_COORD_ARRAY_TYPE)
_param2 returns one value,
the data type of the coordinates in the texture coordinate
array. The initial value is _const(FLOAT). 
See _cmnd(TexCoordPointer).
.TP
_const(TEXTURE_GEN_Q)
_param2 returns a single boolean value indicating whether automatic generation
of the \f2q\fP texture coordinate is enabled. The initial value is _const(FALSE). 
See _cmnd(TexGen).
.TP
_const(TEXTURE_GEN_R)
_param2 returns a single boolean value indicating whether automatic generation
of the \f2r\fP texture coordinate is enabled. The initial value is _const(FALSE). 
See _cmnd(TexGen).
.TP
_const(TEXTURE_GEN_S)
_param2 returns a single boolean value indicating whether automatic generation
of the \f2S\fP texture coordinate is enabled. The initial value is _const(FALSE). 
See _cmnd(TexGen).
.TP
_const(TEXTURE_GEN_T)
_param2 returns a single boolean value indicating whether automatic generation
of the T texture coordinate is enabled. The initial value is _const(FALSE). 
See _cmnd(TexGen).
.TP
_const(TEXTURE_MATRIX)
_param2 returns sixteen values:
the texture matrix on the top of the texture matrix stack. Initially this
matrix is the identity matrix.
See _cmnd(PushMatrix).
.TP
_const(TEXTURE_STACK_DEPTH)
_param2 returns one value,
the number of matrices on the texture matrix stack.
The initial value is 1.
See _cmnd(PushMatrix).
.TP
_const(UNPACK_ALIGNMENT)
_param2 returns one value,
the byte alignment used for reading pixel data from memory. The initial
value is 4. 
See _cmnd(PixelStore).
.TP
_const(UNPACK_IMAGE_HEIGHT)
_param2 returns one value,
the image height used for reading pixel data from memory.  The initial
is 0.
See _cmnd(PixelStore).
.TP
_const(UNPACK_LSB_FIRST)
_param2 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 _const(FALSE). 
See _cmnd(PixelStore).
.TP
_const(UNPACK_ROW_LENGTH)
_param2 returns one value,
the row length used for reading pixel data from memory. The initial value
is 0. 
See _cmnd(PixelStore).
.TP
_const(UNPACK_SKIP_IMAGES)
_param2 returns one value,
the number of pixel images skipped before the first pixel is read
from memory. The initial value is 0. 
See _cmnd(PixelStore).
.TP
_const(UNPACK_SKIP_PIXELS)
_param2 returns one value,
the number of pixel locations skipped before the first pixel is read
from memory. The initial value is 0. 
See _cmnd(PixelStore).
.TP
_const(UNPACK_SKIP_ROWS)
_param2 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 _cmnd(PixelStore).
.TP
_const(UNPACK_SWAP_BYTES)
_param2 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. The initial value is _const(FALSE). 
See _cmnd(PixelStore).
.TP
_const(VERTEX_ARRAY)
_param2 returns a single boolean value indicating whether the vertex
array is enabled. The initial value is _const(FALSE).
See _cmnd(VertexPointer).
.TP
_const(VERTEX_ARRAY_SIZE)
_param2 returns one value,
the number of coordinates per vertex in the vertex array. The initial
value is 4.
See _cmnd(VertexPointer).
.TP
_const(VERTEX_ARRAY_STRIDE)
_param2 returns one value,
the byte offset between consecutive vertices in the vertex
array. The initial value is 0. 
See _cmnd(VertexPointer).
.TP
_const(VERTEX_ARRAY_TYPE)
_param2 returns one value,
the data type of each coordinate in the vertex array. The initial value is
_const(FLOAT). 
See _cmnd(VertexPointer).
.TP
_const(VIEWPORT)
_param2 returns four values:
the $x$ and $y$ window coordinates of the viewport,
followed by its width and height. 
Initially 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 _cmnd(Viewport).
.TP
_const(ZOOM_X)
_param2 returns one value,
the $x$ pixel zoom factor. The initial value is 1. 
See _cmnd(PixelZoom).
.TP
_const(ZOOM_Y)
_param2 returns one value,
the $y$ pixel zoom factor. The initial value is 1.
See _cmnd(PixelZoom).
.P
Many of the boolean parameters can also be queried more easily using
_cmnd(IsEnabled).
.SH NOTES
_const(COLOR_LOGIC_OP), 
_const(COLOR_ARRAY),
_const(COLOR_ARRAY_SIZE),
_const(COLOR_ARRAY_STRIDE),
_const(COLOR_ARRAY_TYPE),
_const(EDGE_FLAG_ARRAY),
_const(EDGE_FLAG_ARRAY_STRIDE),
_const(INDEX_ARRAY),
_const(INDEX_ARRAY_STRIDE),
_const(INDEX_ARRAY_TYPE),
_const(INDEX_LOGIC_OP),
_const(NORMAL_ARRAY),
_const(NORMAL_ARRAY_STRIDE),
_const(NORMAL_ARRAY_TYPE),
_const(POLYGON_OFFSET_UNITS),  
_const(POLYGON_OFFSET_FACTOR),
_const(POLYGON_OFFSET_FILL),  
_const(POLYGON_OFFSET_LINE),  
_const(POLYGON_OFFSET_POINT),
_const(TEXTURE_COORD_ARRAY),
_const(TEXTURE_COORD_ARRAY_SIZE),
_const(TEXTURE_COORD_ARRAY_STRIDE),
_const(TEXTURE_COORD_ARRAY_TYPE),
_const(VERTEX_ARRAY),
_const(VERTEX_ARRAY_SIZE),
_const(VERTEX_ARRAY_STRIDE), and
_const(VERTEX_ARRAY_TYPE)
are available only if the GL version is 1.1 or greater.  
.P
_const(ALIASED_POINT_SIZE_RANGE),
_const(ALIASED_POINT_SIZE_GRANULARITY),
_const(FEEDBACK_BUFFER_SIZE),
_const(FEEDBACK_BUFFER_TYPE),
_const(LIGHT_MODEL_AMBIENT),
_const(LIGHT_MODEL_COLOR_CONTROL),
_const(MAX_3D_TEXTURE_SIZE),
_const(MAX_ELEMENTS_INDICES),
_const(MAX_ELEMENTS_VERTICES),
_const(PACK_IMAGE_HEIGHT),
_const(PACK_SKIP_IMAGES),
_const(RESCALE_NORMAL),
_const(SELECTION_BUFFER_SIZE),
_const(SMOOTH_LINE_WIDTH_GRANULARITY),
_const(SMOOTH_LINE_WIDTH_RANGE),
_const(SMOOTH_POINT_SIZE_GRANULARITY),
_const(SMOOTH_POINT_SIZE_RANGE),
_const(TEXTURE_3D), 
_const(TEXTURE_BINDING_3D),
_const(UNPACK_IMAGE_HEIGHT), and
_const(UNPACK_SKIP_IMAGES)
are available only if the GL version is 1.2 or greater.  
.P
_const(LINE_WIDTH_GRANULARITY) was deprecated in GL version 1.2.  Its
functionality was replaced by _const(SMOOTH_LINE_WIDTH_GRANULARITY).
.P
_const(LINE_WIDTH_RANGE) was deprecated in GL version 1.2.  Its
functionality was replaced by _const(SMOOTH_LINE_WIDTH_RANGE).
.P
_const(POINT_SIZE_GRANULARITY) was deprecated in GL version 1.2.  Its
functionality was replaced by _const(SMOOTH_POINT_SIZE_GRANULARITY).
.P
_const(POINT_SIZE_RANGE) was deprecated in GL version 1.2.  Its
functionality was replaced by _const(SMOOTH_POINT_SIZE_RANGE).
.P
_const(BLEND_COLOR),
_const(BLEND_EQUATION),
_const(COLOR_MATRIX),
_const(COLOR_MATRIX_STACK_DEPTH),
_const(COLOR_TABLE),
_const(CONVOLUTION_1D),
_const(CONVOLUTION_2D),
_const(HISTOGRAM),
_const(MAX_COLOR_MATRIX_STACK_DEPTH),
_const(MINMAX),
_const(POST_COLOR_MATRIX_COLOR_TABLE),
_const(POST_COLOR_MATRIX_RED_BIAS),
_const(POST_COLOR_MATRIX_GREEN_BIAS),
_const(POST_COLOR_MATRIX_BLUE_BIAS),
_const(POST_COLOR_MATRIX_ALPHA_BIAS),
_const(POST_COLOR_MATRIX_RED_SCALE),
_const(POST_COLOR_MATRIX_GREEN_SCALE),
_const(POST_COLOR_MATRIX_BLUE_SCALE),
_const(POST_COLOR_MATRIX_ALPHA_SCALE),
_const(POST_CONVOLUTION_COLOR_TABLE),
_const(POST_CONVOLUTION_RED_BIAS),
_const(POST_CONVOLUTION_GREEN_BIAS),
_const(POST_CONVOLUTION_BLUE_BIAS),
_const(POST_CONVOLUTION_ALPHA_BIAS),
_const(POST_CONVOLUTION_RED_SCALE),
_const(POST_CONVOLUTION_GREEN_SCALE),
_const(POST_CONVOLUTION_BLUE_SCALE),
_const(POST_CONVOLUTION_ALPHA_SCALE), and
_const(SEPARABLE_2D)
are available only if _arbstring(imaging) is returned from _cmnd(Get)
when called with the argument _const(EXTENSIONS).
.P
_arbconst(ACTIVE_TEXTURE),
_arbconst(CLIENT_ACTIVE_TEXTURE), and
_arbconst(MAX_TEXTURE_UNITS) are available only if
_arbstring(multitexture) is returned from _cmnd(Get) when called with the
argument _const(EXTENSIONS).
.P
When the _arbstring(multitexture) extension is supported, the following
parameters return the associated value for the active texture unit:
_const(CURRENT_RASTER_TEXTURE_COORDS),
_const(TEXTURE_1D), _const(TEXTURE_BINDING_1D),
_const(TEXTURE_2D), _const(TEXTURE_BINDING_2D),
_const(TEXTURE_3D), _const(TEXTURE_BINDING_3D),
_const(TEXTURE_GEN_S),
_const(TEXTURE_GEN_T),
_const(TEXTURE_GEN_R),
_const(TEXTURE_GEN_Q),
_const(TEXTURE_MATRIX), and
_const(TEXTURE_STACK_DEPTH).
Likewise, the following parameters return the associated value for the
active client texture unit:
_const(TEXTURE_COORD_ARRAY),
_const(TEXTURE_COORD_ARRAY_SIZE),
_const(TEXTURE_COORD_ARRAY_STRIDE),
_const(TEXTURE_COORD_ARRAY_TYPE).
.SH ERRORS
_const(INVALID_ENUM) is generated if _param1 is not an accepted value.
.P
_const(INVALID_OPERATION) is generated if _cmnd
is executed between the execution of _cmnd(Begin)
and the corresponding execution of _cmnd(End).
.P
.SH SEE ALSO
_cmnd(GetClipPlane),
_cmnd(GetColorTable),
_cmnd(GetColorTableParameter),
_cmnd(GetConvolutionFilter),
_cmnd(GetConvolutionParameter),
_cmnd(GetError),
_cmnd(GetHistogram),
_cmnd(GetHistogramParameter),
_cmnd(GetLight),
_cmnd(GetMap),
_cmnd(GetMaterial),
_cmnd(GetMinmax),
_cmnd(GetMinmaxParameter),
_cmnd(GetPixelMap),
_cmnd(GetPointerv),
_cmnd(GetPolygonStipple),
_cmnd(GetSeparableFilter),
_cmnd(GetString),
_cmnd(GetTexEnv),
_cmnd(GetTexGen),
_cmnd(GetTexImage),
_cmnd(GetTexLevelParameter),
_cmnd(GetTexParameter),
_cmnd(IsEnabled)