glGet
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## Name

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

## C Specification

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

## Python Specification

``glGetBooleanv`` | `(` | ``pname`) → `params``
``glGetDoublev`` | `(` | ``pname`) → `params``
``glGetFloatv`` | `(` | ``pname`) → `params``
``glGetIntegerv`` | `(` | ``pname`) → `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 0.0 (or 0). 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. The initial value is (0, 0, 0, 0). 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_ACTIVE_TEXTURE_ARB`
  `params` returns a single value indicating the active multitexture unit. The initial value is `GL_TEXTURE0_ARB`. See `glActiveTextureARB`.
`GL_ALIASED_POINT_SIZE_RANGE`
  `params` returns two values, the smallest and largest supported sizes for aliased points.
`GL_ALIASED_LINE_WIDTH_RANGE`
  `params` returns two values, the smallest and largest supported widths for aliased lines.
`GL_ALPHA_BIAS`
  `params` returns one value, the alpha bias factor used during pixel transfers. The initial value is 0. 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. The initial value is 1. See `glPixelTransfer`.
`GL_ALPHA_TEST`
  `params` returns a single boolean value indicating whether alpha testing of fragments is enabled. The initial value is `GL_FALSE`. See `glAlphaFunc`.
`GL_ALPHA_TEST_FUNC`
  `params` returns one value, the symbolic name of the alpha test function. The initial value is `GL_ALWAYS`. See `glAlphaFunc`.
`GL_ALPHA_TEST_REF`
  `params` returns one value, the reference value for the alpha test. The initial value is 0. See `glAlphaFunc`. An integer value, if requested, is linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value.
`GL_ATTRIB_STACK_DEPTH`
  `params` returns one value, the depth of the attribute stack. If the stack is empty, 0 is returned. The initial value is 0. See `glPushAttrib`.
`GL_AUTO_NORMAL`
  `params` returns a single boolean value indicating whether 2D map evaluation automatically generates surface normals. The initial value is `GL_FALSE`. See `glMap2`.
`GL_AUX_BUFFERS`
  `params` returns one value, the number of auxiliary color buffers. The initial value is 0.
`GL_BLEND`
  `params` returns a single boolean value indicating whether blending is enabled. The initial value is `GL_FALSE`. See `glBlendFunc`.
`GL_BLEND_COLOR`
  `params` returns four values, the red, green, blue, and alpha values which are the components of the blend color. See `glBlendColor`.
`GL_BLEND_DST`
  `params` returns one value, the symbolic constant identifying the destination blend function. The initial value is `GL_ZERO`. See `glBlendFunc`.
`GL_BLEND_EQUATION`
  `params` returns one value, a symbolic constant indicating whether the blend equation is `GL_FUNC_ADD`, `GL_MIN` or `GL_MAX`. See `glBlendEquation`.
`GL_BLEND_SRC`
  `params` returns one value, the symbolic constant identifying the source blend function. The initial value is `GL_ONE`. See `glBlendFunc`.
`GL_BLUE_BIAS`
  `params` returns one value, the blue bias factor used during pixel transfers. The initial value is 0. 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. The initial value is 1. See `glPixelTransfer`.
`GL_CLIENT_ACTIVE_TEXTURE_ARB`
  `params` returns a single integer value indicating the current client active multitexture unit. The initial value is `GL_TEXTURE0_ARB`. See `glClientActiveTextureARB`.
`GL_CLIENT_ATTRIB_STACK_DEPTH`
  `params` returns one value indicating the depth of the attribute stack. The initial value is 0. See `glPushClientAttrib`.
`GL_CLIP_PLANE` `i`
  `params` returns a single boolean value indicating whether the specified clipping plane is enabled. The initial value is `GL_FALSE`. See `glClipPlane`.
`GL_COLOR_ARRAY`
  `params` returns a single boolean value indicating whether the color array is enabled. The initial value is `GL_FALSE`. See `glColorPointer`.
`GL_COLOR_ARRAY_SIZE`
  `params` returns one value, the number of components per color in the color array. The initial value is 4. See `glColorPointer`.
`GL_COLOR_ARRAY_STRIDE`
  `params` returns one value, the byte offset between consecutive colors in the color array. The initial value is 0. See `glColorPointer`.
`GL_COLOR_ARRAY_TYPE`
  `params` returns one value, the data type of each component in the color array. The initial value is `GL_FLOAT`. See `glColorPointer`.
`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. The initial value is (0, 0, 0, 0). See `glClearColor`.
`GL_COLOR_LOGIC_OP`
  `params` returns a single boolean value indicating whether a fragment's RGBA color values are merged into the framebuffer using a logical operation. The initial value is `GL_FALSE`. See `glLogicOp`.
`GL_COLOR_MATERIAL`
  `params` returns a single boolean value indicating whether one or more material parameters are tracking the current color. The initial value is `GL_FALSE`. See `glColorMaterial`.
`GL_COLOR_MATERIAL_FACE`
  `params` returns one value, a symbolic constant indicating which materials have a parameter that is tracking the current color. The initial value is `GL_FRONT_AND_BACK`. See `glColorMaterial`.
`GL_COLOR_MATERIAL_PARAMETER`
  `params` returns one value, a symbolic constant indicating which material parameters are tracking the current color. The initial value is `GL_AMBIENT_AND_DIFFUSE`. See `glColorMaterial`.
`GL_COLOR_MATRIX`
  `params` returns sixteen values: the color matrix on the top of the color matrix stack. Initially this matrix is the identity matrix. See `glPushMatrix`.
`GL_COLOR_MATRIX_STACK_DEPTH`
  `params` returns one value, the maximum supported depth of the projection matrix stack. The value must be at least 2. See `glPushMatrix`.
`GL_COLOR_TABLE`
  `params` returns a single boolean value indicating whether the color table lookup is enabled. See `glColorTable`.
`GL_COLOR_WRITEMASK`
  `params` returns four boolean values: the red, green, blue, and alpha write enables for the color buffers. The initial value is (`GL_TRUE`, `GL_TRUE`, `GL_TRUE`, `GL_TRUE`). See `glColorMask`.
`GL_CONVOLUTION_1D`
  `params` returns a single boolean value indicating whether 1D convolution is enabled. The initial value is `GL_FALSE`. See `glConvolutionFilter1D`.
`GL_CONVOLUTION_2D`
  `params` returns a single boolean value indicating whether 2D convolution is enabled. The initial value is `GL_FALSE`. See `glConvolutionFilter2D`.
`GL_CULL_FACE`
  `params` returns a single boolean value indicating whether polygon culling is enabled. The initial value is `GL_FALSE`. See `glCullFace`.
`GL_CULL_FACE_MODE`
  `params` returns one value, a symbolic constant indicating which polygon faces are to be culled. The initial value is `GL_BACK`. 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`. The initial value is (1, 1, 1, 1).
`GL_CURRENT_INDEX`
  `params` returns one value, the current color index. The initial value is 1. 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. The initial value is (0, 0, 1). 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. The initial value is (1, 1, 1, 1). See `glRasterPos`.
`GL_CURRENT_RASTER_DISTANCE`
  `params` returns one value, the distance from the eye to the current raster position. The initial value is 0. See `glRasterPos`.
`GL_CURRENT_RASTER_INDEX`
  `params` returns one value, the color index of the current raster position. The initial value is 1. 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. The initial value is (0, 0, 0, 1). See `glRasterPos`.
`GL_CURRENT_RASTER_POSITION_VALID`
  `params` returns a single boolean value indicating whether the current raster position is valid. The initial value is `GL_TRUE`. See `glRasterPos`.
`GL_CURRENT_RASTER_TEXTURE_COORDS`
  `params` returns four values: the `s`, `t`, `r`, and `q` current raster texture coordinates. The initial value is (0, 0, 0, 1). See `glRasterPos` and `glTexCoord`.
`GL_CURRENT_TEXTURE_COORDS`
  `params` returns four values: the `s`, `t`, `r`, and `q` current texture coordinates. The initial value is (0, 0, 0, 1). See `glTexCoord`.
`GL_DEPTH_BIAS`
  `params` returns one value, the depth bias factor used during pixel transfers. The initial value is 0. 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. The initial value is 1. See `glClearDepth`.
`GL_DEPTH_FUNC`
  `params` returns one value, the symbolic constant that indicates the depth comparison function. The initial value is `GL_LESS`. 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. The initial value is (0, 1). See `glDepthRange`.
`GL_DEPTH_SCALE`
  `params` returns one value, the depth scale factor used during pixel transfers. The initial value is 1. See `glPixelTransfer`.
`GL_DEPTH_TEST`
  `params` returns a single boolean value indicating whether depth testing of fragments is enabled. The initial value is `GL_FALSE`. See `glDepthFunc` and `glDepthRange`.
`GL_DEPTH_WRITEMASK`
  `params` returns a single boolean value indicating if the depth buffer is enabled for writing. The initial value is `GL_TRUE`. See `glDepthMask`.
`GL_DITHER`
  `params` returns a single boolean value indicating whether dithering of fragment colors and indices is enabled. The initial value is `GL_TRUE`.
`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`. The initial value is `GL_BACK` if there are back buffers, otherwise it is `GL_FRONT`.
`GL_EDGE_FLAG`
  `params` returns a single boolean value indicating whether the current edge flag is `GL_TRUE` or `GL_FALSE`. The initial value is `GL_TRUE`. See `glEdgeFlag`.
`GL_EDGE_FLAG_ARRAY`
  `params` returns a single boolean value indicating whether the edge flag array is enabled. The initial value is `GL_FALSE`. See `glEdgeFlagPointer`.
`GL_EDGE_FLAG_ARRAY_STRIDE`
  `params` returns one value, the byte offset between consecutive edge flags in the edge flag array. The initial value is 0. See `glEdgeFlagPointer`.
`GL_FEEDBACK_BUFFER_SIZE`
  `params` returns one value, the size of the feedback buffer. See `glFeedbackBuffer`.
`GL_FEEDBACK_BUFFER_TYPE`
  `params` returns one value, the type of the feedback buffer. See `glFeedbackBuffer`.
`GL_FOG`
  `params` returns a single boolean value indicating whether fogging is enabled. The initial value is `GL_FALSE`. 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. The initial value is (0, 0, 0, 0). See `glFog`.
`GL_FOG_DENSITY`
  `params` returns one value, the fog density parameter. The initial value is 1. See `glFog`.
`GL_FOG_END`
  `params` returns one value, the end factor for the linear fog equation. The initial value is 1. See `glFog`.
`GL_FOG_HINT`
  `params` returns one value, a symbolic constant indicating the mode of the fog hint. The initial value is `GL_DONT_CARE`. See `glHint`.
`GL_FOG_INDEX`
  `params` returns one value, the fog color index. The initial value is 0. See `glFog`.
`GL_FOG_MODE`
  `params` returns one value, a symbolic constant indicating which fog equation is selected. The initial value is `GL_EXP`. See `glFog`.
`GL_FOG_START`
  `params` returns one value, the start factor for the linear fog equation. The initial value is 0. See `glFog`.
`GL_FRONT_FACE`
  `params` returns one value, a symbolic constant indicating whether clockwise or counterclockwise polygon winding is treated as front-facing. The initial value is `GL_CCW`. See `glFrontFace`.
`GL_GREEN_BIAS`
  `params` returns one value, the green bias factor used during pixel transfers. The initial value is 0.
`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. The initial value is 1. See `glPixelTransfer`.
`GL_HISTOGRAM`
  `params` returns a single boolean value indicating whether histogram is enabled. The initial value is `GL_FALSE`. See `glHistogram`.
`GL_INDEX_ARRAY`
  `params` returns a single boolean value indicating whether the color index array is enabled. The initial value is `GL_FALSE`. See `glIndexPointer`.
`GL_INDEX_ARRAY_STRIDE`
  `params` returns one value, the byte offset between consecutive color indexes in the color index array. The initial value is 0. See `glIndexPointer`.
`GL_INDEX_ARRAY_TYPE`
  `params` returns one value, the data type of indexes in the color index array. The initial value is `GL_FLOAT`. See `glIndexPointer`.
`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. The initial value is 0. See `glClearIndex`.
`GL_INDEX_LOGIC_OP`
  `params` returns a single boolean value indicating whether a fragment's index values are merged into the framebuffer using a logical operation. The initial value is `GL_FALSE`. See `glLogicOp`.
`GL_INDEX_MODE`
  `params` returns a single boolean value indicating whether the GL is in color index mode (`GL_TRUE`) or RGBA mode (`GL_FALSE`).
`GL_INDEX_OFFSET`
  `params` returns one value, the offset added to color and stencil indices during pixel transfers. The initial value is 0. See `glPixelTransfer`.
`GL_INDEX_SHIFT`
  `params` returns one value, the amount that color and stencil indices are shifted during pixel transfers. The initial value is 0. See `glPixelTransfer`.
`GL_INDEX_WRITEMASK`
  `params` returns one value, a mask indicating which bitplanes of each color index buffer can be written. The initial value is all 1's. See `glIndexMask`.
`GL_LIGHT` `i`
  `params` returns a single boolean value indicating whether the specified light is enabled. The initial value is `GL_FALSE`. See `glLight` and `glLightModel`.
`GL_LIGHTING`
  `params` returns a single boolean value indicating whether lighting is enabled. The initial value is `GL_FALSE`. 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. The initial value is (0.2, 0.2, 0.2, 1.0). See `glLightModel`.
`GL_LIGHT_MODEL_COLOR_CONTROL`
  `params` returns single enumerated value indicating whether specular reflection calculations are separated from normal lighting computations. The initial value is `GL_SINGLE_COLOR`.
`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. The initial value is `GL_FALSE`. 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. The initial value is `GL_FALSE`. See `glLightModel`.
`GL_LINE_SMOOTH`
  `params` returns a single boolean value indicating whether antialiasing of lines is enabled. The initial value is `GL_FALSE`. See `glLineWidth`.
`GL_LINE_SMOOTH_HINT`
  `params` returns one value, a symbolic constant indicating the mode of the line antialiasing hint. The initial value is `GL_DONT_CARE`. See `glHint`.
`GL_LINE_STIPPLE`
  `params` returns a single boolean value indicating whether stippling of lines is enabled. The initial value is `GL_FALSE`. See `glLineStipple`.
`GL_LINE_STIPPLE_PATTERN`
  `params` returns one value, the 16-bit line stipple pattern. The initial value is all 1's. See `glLineStipple`.
`GL_LINE_STIPPLE_REPEAT`
  `params` returns one value, the line stipple repeat factor. The initial value is 1. See `glLineStipple`.
`GL_LINE_WIDTH`
  `params` returns one value, the line width as specified with `glLineWidth`. The initial value is 1.
`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`. The initial value is 0. See `glListBase`.
`GL_LIST_INDEX`
  `params` 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 `glNewList`.
`GL_LIST_MODE`
  `params` returns one value, a symbolic constant indicating the construction mode of the display list currently under construction. The initial value is 0. See `glNewList`.
`GL_LOGIC_OP_MODE`
  `params` returns one value, a symbolic constant indicating the selected logic operation mode. The initial value is `GL_COPY`. See `glLogicOp`.
`GL_MAP1_COLOR_4`
  `params` returns a single boolean value indicating whether 1D evaluation generates colors. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP1_GRID_DOMAIN`
  `params` returns two values: the endpoints of the 1D map's grid domain. The initial value is (0, 1). See `glMapGrid`.
`GL_MAP1_GRID_SEGMENTS`
  `params` returns one value, the number of partitions in the 1D map's grid domain. The initial value is 1. See `glMapGrid`.
`GL_MAP1_INDEX`
  `params` returns a single boolean value indicating whether 1D evaluation generates color indices. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP1_NORMAL`
  `params` returns a single boolean value indicating whether 1D evaluation generates normals. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP1_TEXTURE_COORD_1`
  `params` returns a single boolean value indicating whether 1D evaluation generates 1D texture coordinates. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP1_TEXTURE_COORD_2`
  `params` returns a single boolean value indicating whether 1D evaluation generates 2D texture coordinates. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP1_TEXTURE_COORD_3`
  `params` returns a single boolean value indicating whether 1D evaluation generates 3D texture coordinates. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP1_TEXTURE_COORD_4`
  `params` returns a single boolean value indicating whether 1D evaluation generates 4D texture coordinates. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP1_VERTEX_3`
  `params` returns a single boolean value indicating whether 1D evaluation generates 3D vertex coordinates. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP1_VERTEX_4`
  `params` returns a single boolean value indicating whether 1D evaluation generates 4D vertex coordinates. The initial value is `GL_FALSE`. See `glMap1`.
`GL_MAP2_COLOR_4`
  `params` returns a single boolean value indicating whether 2D evaluation generates colors. The initial value is `GL_FALSE`. See `glMap2`.
`GL_MAP2_GRID_DOMAIN`
  `params` returns four values: the endpoints of the 2D map's i and j grid domains. The initial value is (0,1; 0,1). See `glMapGrid`.
`GL_MAP2_GRID_SEGMENTS`
  `params` returns two values: the number of partitions in the 2D map's i and j grid domains. The initial value is (1,1). See `glMapGrid`.
`GL_MAP2_INDEX`
  `params` returns a single boolean value indicating whether 2D evaluation generates color indices. The initial value is `GL_FALSE`. See `glMap2`.
`GL_MAP2_NORMAL`
  `params` returns a single boolean value indicating whether 2D evaluation generates normals. The initial value is `GL_FALSE`. See `glMap2`.
`GL_MAP2_TEXTURE_COORD_1`
  `params` returns a single boolean value indicating whether 2D evaluation generates 1D texture coordinates. The initial value is `GL_FALSE`. See `glMap2`.
`GL_MAP2_TEXTURE_COORD_2`
  `params` returns a single boolean value indicating whether 2D evaluation generates 2D texture coordinates. The initial value is `GL_FALSE`. See `glMap2`.
`GL_MAP2_TEXTURE_COORD_3`
  `params` returns a single boolean value indicating whether 2D evaluation generates 3D texture coordinates. The initial value is `GL_FALSE`. See `glMap2`.
`GL_MAP2_TEXTURE_COORD_4`
  `params` returns a single boolean value indicating whether 2D evaluation generates 4D texture coordinates. The initial value is `GL_FALSE`. See `glMap2`.
`GL_MAP2_VERTEX_3`
  `params` returns a single boolean value indicating whether 2D evaluation generates 3D vertex coordinates. The initial value is `GL_FALSE`. See `glMap2`.
`GL_MAP2_VERTEX_4`
  `params` returns a single boolean value indicating whether 2D evaluation generates 4D vertex coordinates. The initial value is `GL_FALSE`. 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. The initial value is `GL_FALSE`. 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. The initial value is `GL_FALSE`. See `glPixelTransfer`.
`GL_MATRIX_MODE`
  `params` returns one value, a symbolic constant indicating which matrix stack is currently the target of all matrix operations. The initial value is `GL_MODELVIEW`. See `glMatrixMode`.
`GL_MAX_3D_TEXTURE_SIZE`
  `params` returns one value, a rough estimate of the largest 3D texture that the GL can handle. If the GL version is 1.2 or greater, use `GL_PROXY_TEXTURE_3D` to determine if a texture is too large. See `glTexImage3D`.
`GL_MAX_CLIENT_ATTRIB_STACK_DEPTH`
  `params` returns one value indicating the maximum supported depth of the client attribute stack. See `glPushClientAttrib`.
`GL_MAX_ATTRIB_STACK_DEPTH`
  `params` returns one value, the maximum supported depth of the attribute stack. The value must be at least 16. See `glPushAttrib`.
`GL_MAX_CLIP_PLANES`
  `params` returns one value, the maximum number of application-defined clipping planes. The value must be at least 6. See `glClipPlane`.
`GL_MAX_COLOR_MATRIX_STACK_DEPTH`
  `params` returns one value, the maximum supported depth of the color matrix stack. The value must be at least 2. See `glPushMatrix`.
`GL_MAX_ELEMENTS_INDICES`
  `params` returns one value, the recommended maximum number of vertex array indices. See `glDrawRangeElements`.
`GL_MAX_ELEMENTS_VERTICES`
  `params` returns one value, the recommended maximum number of vertex array vertices. See `glDrawRangeElements`.
`GL_MAX_EVAL_ORDER`
  `params` returns one value, the maximum equation order supported by 1D and 2D evaluators. The value must be at least 8. See `glMap1` and `glMap2`.
`GL_MAX_LIGHTS`
  `params` returns one value, the maximum number of lights. The value must be at least 8. See `glLight`.
`GL_MAX_LIST_NESTING`
  `params` returns one value, the maximum recursion depth allowed during display-list traversal. The value must be at least 64. See `glCallList`.
`GL_MAX_MODELVIEW_STACK_DEPTH`
  `params` returns one value, the maximum supported depth of the modelview matrix stack. The value must be at least 32. See `glPushMatrix`.
`GL_MAX_NAME_STACK_DEPTH`
  `params` returns one value, the maximum supported depth of the selection name stack. The value must be at least 64. See `glPushName`.
`GL_MAX_PIXEL_MAP_TABLE`
  `params` returns one value, the maximum supported size of a `glPixelMap` lookup table. The value must be at least 32. See `glPixelMap`.
`GL_MAX_PROJECTION_STACK_DEPTH`
  `params` returns one value, the maximum supported depth of the projection matrix stack. The value must be at least 2. See `glPushMatrix`.
`GL_MAX_TEXTURE_SIZE`
  `params` returns one value. The value gives a rough estimate of the largest texture that the GL can handle. If the GL version is 1.1 or greater, use `GL_PROXY_TEXTURE_1D` or `GL_PROXY_TEXTURE_2D` to determine if a texture is too large. See `glTexImage1D` and `glTexImage2D`.
`GL_MAX_TEXTURE_STACK_DEPTH`
  `params` returns one value, the maximum supported depth of the texture matrix stack. The value must be at least 2. See `glPushMatrix`.
`GL_MAX_TEXTURE_UNITS_ARB`
  `params` returns a single value indicating the number of texture units supported. The value must be at least 1. See `glActiveTextureARB`.
`GL_MAX_VIEWPORT_DIMS`
  `params` returns two values: the maximum supported width and height of the viewport. These must be at least as large as the visible dimensions of the display being rendered to. See `glViewport`.
`GL_MINMAX`
  `params` returns a single boolean value indicating whether pixel minmax values are computed. The initial value is `GL_FALSE`. See `glMinmax`.
`GL_MODELVIEW_MATRIX`
  `params` returns sixteen values: the modelview matrix on the top of the modelview matrix stack. Initially this matrix is the identity matrix. See `glPushMatrix`.
`GL_MODELVIEW_STACK_DEPTH`
  `params` returns one value, the number of matrices on the modelview matrix stack. The initial value is 1. See `glPushMatrix`.
`GL_NAME_STACK_DEPTH`
  `params` returns one value, the number of names on the selection name stack. The initial value is 0. See `glPushName`.
`GL_NORMAL_ARRAY`
  `params` returns a single boolean value, indicating whether the normal array is enabled. The initial value is `GL_FALSE`. See `glNormalPointer`.
`GL_NORMAL_ARRAY_STRIDE`
  `params` returns one value, the byte offset between consecutive normals in the normal array. The initial value is 0. See `glNormalPointer`.
`GL_NORMAL_ARRAY_TYPE`
  `params` returns one value, the data type of each coordinate in the normal array. The initial value is `GL_FLOAT`. See `glNormalPointer`.
`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. The initial value is `GL_FALSE`. See `glNormal`.
`GL_PACK_ALIGNMENT`
  `params` returns one value, the byte alignment used for writing pixel data to memory. The initial value is 4. See `glPixelStore`.
`GL_PACK_IMAGE_HEIGHT`
  `params` returns one value, the image height used for writing pixel data to memory. The initial value is 0. 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. The initial value is `GL_FALSE`. See `glPixelStore`.
`GL_PACK_ROW_LENGTH`
  `params` returns one value, the row length used for writing pixel data to memory. The initial value is 0. See `glPixelStore`.
`GL_PACK_SKIP_IMAGES`
  `params` returns one value, the number of pixel images skipped before the first pixel is written into memory. The initial value is 0. See `glPixelStore`.
`GL_PACK_SKIP_PIXELS`
  `params` returns one value, the number of pixel locations skipped before the first pixel is written into memory. The initial value is 0. See `glPixelStore`.
`GL_PACK_SKIP_ROWS`
  `params` returns one value, the number of rows of pixel locations skipped before the first pixel is written into memory. The initial value is 0. See `glPixelStore`.
`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. The initial value is `GL_FALSE`. See `glPixelStore`.
`GL_PERSPECTIVE_CORRECTION_HINT`
  `params` returns one value, a symbolic constant indicating the mode of the perspective correction hint. The initial value is `GL_DONT_CARE`. See `glHint`.
`GL_PIXEL_MAP_A_TO_A_SIZE`
  `params` returns one value, the size of the alpha-to-alpha pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_B_TO_B_SIZE`
  `params` returns one value, the size of the blue-to-blue pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_G_TO_G_SIZE`
  `params` returns one value, the size of the green-to-green pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_I_TO_A_SIZE`
  `params` returns one value, the size of the index-to-alpha pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_I_TO_B_SIZE`
  `params` returns one value, the size of the index-to-blue pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_I_TO_G_SIZE`
  `params` returns one value, the size of the index-to-green pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_I_TO_I_SIZE`
  `params` returns one value, the size of the index-to-index pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_I_TO_R_SIZE`
  `params` returns one value, the size of the index-to-red pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_R_TO_R_SIZE`
  `params` returns one value, the size of the red-to-red pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_PIXEL_MAP_S_TO_S_SIZE`
  `params` returns one value, the size of the stencil-to-stencil pixel translation table. The initial value is 1. See `glPixelMap`.
`GL_POINT_SIZE`
  `params` returns one value, the point size as specified by `glPointSize`. The initial value is 1.
`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. The smallest size must be at most 1, and the largest size must be at least 1. See `glPointSize`.
`GL_POINT_SMOOTH`
  `params` returns a single boolean value indicating whether antialiasing of points is enabled. The initial value is `GL_FALSE`. See `glPointSize`.
`GL_POINT_SMOOTH_HINT`
  `params` returns one value, a symbolic constant indicating the mode of the point antialiasing hint. The initial value is `GL_DONT_CARE`. 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. The initial value is `GL_FILL`. See `glPolygonMode`.
`GL_POLYGON_OFFSET_FACTOR`
  `params` returns one value, the scaling factor used to determine the variable offset that is added to the depth value of each fragment generated when a polygon is rasterized. The initial value is 0. See `glPolygonOffset`.
`GL_POLYGON_OFFSET_UNITS`
  `params` returns one value. This value is multiplied by an implementation-specific value and then added to the depth value of each fragment generated when a polygon is rasterized. The initial value is 0. See `glPolygonOffset`.
`GL_POLYGON_OFFSET_FILL`
  `params` returns a single boolean value indicating whether polygon offset is enabled for polygons in fill mode. The initial value is `GL_FALSE`. See `glPolygonOffset`.
`GL_POLYGON_OFFSET_LINE`
  `params` returns a single boolean value indicating whether polygon offset is enabled for polygons in line mode. The initial value is `GL_FALSE`. See `glPolygonOffset`.
`GL_POLYGON_OFFSET_POINT`
  `params` returns a single boolean value indicating whether polygon offset is enabled for polygons in point mode. The initial value is `GL_FALSE`. See `glPolygonOffset`.
`GL_POLYGON_SMOOTH`
  `params` returns a single boolean value indicating whether antialiasing of polygons is enabled. The initial value is `GL_FALSE`. See `glPolygonMode`.
`GL_POLYGON_SMOOTH_HINT`
  `params` returns one value, a symbolic constant indicating the mode of the polygon antialiasing hint. The initial value is `GL_DONT_CARE`. See `glHint`.
`GL_POLYGON_STIPPLE`
  `params` returns a single boolean value indicating whether polygon stippling is enabled. The initial value is `GL_FALSE`. See `glPolygonStipple`.
`GL_POST_COLOR_MATRIX_COLOR_TABLE`
  `params` returns a single boolean value indicating whether post color matrix transformation lookup is enabled. The initial value is `GL_FALSE`. See `glColorTable`.
`GL_POST_COLOR_MATRIX_RED_BIAS`
  `params` returns one value, the red bias factor applied to RGBA fragments after color matrix transformations. The initial value is 0. See `glPixelTransfer`.
`GL_POST_COLOR_MATRIX_GREEN_BIAS`
  `params` returns one value, the green bias factor applied to RGBA fragments after color matrix transformations. The initial value is 0. See `glPixelTransfer`
`GL_POST_COLOR_MATRIX_BLUE_BIAS`
  `params` returns one value, the blue bias factor applied to RGBA fragments after color matrix transformations. The initial value is 0. See `glPixelTransfer`.
`GL_POST_COLOR_MATRIX_ALPHA_BIAS`
  `params` returns one value, the alpha bias factor applied to RGBA fragments after color matrix transformations. The initial value is 0. See `glPixelTransfer`.
`GL_POST_COLOR_MATRIX_RED_SCALE`
  `params` returns one value, the red scale factor applied to RGBA fragments after color matrix transformations. The initial value is 1. See `glPixelTransfer`.
`GL_POST_COLOR_MATRIX_GREEN_SCALE`
  `params` returns one value, the green scale factor applied to RGBA fragments after color matrix transformations. The initial value is 1. See `glPixelTransfer`.
`GL_POST_COLOR_MATRIX_BLUE_SCALE`
  `params` returns one value, the blue scale factor applied to RGBA fragments after color matrix transformations. The initial value is 1. See `glPixelTransfer`.
`GL_POST_COLOR_MATRIX_ALPHA_SCALE`
  `params` returns one value, the alpha scale factor applied to RGBA fragments after color matrix transformations. The initial value is 1. See `glPixelTransfer`.
`GL_POST_CONVOLUTION_COLOR_TABLE`
  `params` returns a single boolean value indicating whether post convolution lookup is enabled. The initial value is `GL_FALSE`. See `glColorTable`.
`GL_POST_CONVOLUTION_RED_BIAS`
  `params` returns one value, the red bias factor applied to RGBA fragments after convolution. The initial value is 0. See `glPixelTransfer`.
`GL_POST_CONVOLUTION_GREEN_BIAS`
  `params` returns one value, the green bias factor applied to RGBA fragments after convolution. The initial value is 0. See `glPixelTransfer`.
`GL_POST_CONVOLUTION_BLUE_BIAS`
  `params` returns one value, the blue bias factor applied to RGBA fragments after convolution. The initial value is 0. See `glPixelTransfer`.
`GL_POST_CONVOLUTION_ALPHA_BIAS`
  `params` returns one value, the alpha bias factor applied to RGBA fragments after convolution. The initial value is 0. See `glPixelTransfer`.
`GL_POST_CONVOLUTION_RED_SCALE`
  `params` returns one value, the red scale factor applied to RGBA fragments after convolution. The initial value is 1. See `glPixelTransfer`.
`GL_POST_CONVOLUTION_GREEN_SCALE`
  `params` returns one value, the green scale factor applied to RGBA fragments after convolution. The initial value is 1. See `glPixelTransfer`.
`GL_POST_CONVOLUTION_BLUE_SCALE`
  `params` returns one value, the blue scale factor applied to RGBA fragments after convolution. The initial value is 1. See `glPixelTransfer`.
`GL_POST_CONVOLUTION_ALPHA_SCALE`
  `params` returns one value, the alpha scale factor applied to RGBA fragments after convolution. The initial value is 1. See `glPixelTransfer`.
`GL_PROJECTION_MATRIX`
  `params` returns sixteen values: the projection matrix on the top of the projection matrix stack. Initially this matrix is the identity matrix. See `glPushMatrix`.
`GL_PROJECTION_STACK_DEPTH`
  `params` returns one value, the number of matrices on the projection matrix stack. The initial value is 1. See `glPushMatrix`.
`GL_READ_BUFFER`
  `params` returns one value, a symbolic constant indicating which color buffer is selected for reading. The initial value is `GL_BACK` if there is a back buffer, otherwise it is `GL_FRONT`. See `glReadPixels` and `glAccum`.
`GL_RED_BIAS`
  `params` returns one value, the red bias factor used during pixel transfers. The initial value is 0.
`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. The initial value is 1. See `glPixelTransfer`.
`GL_RENDER_MODE`
  `params` returns one value, a symbolic constant indicating whether the GL is in render, select, or feedback mode. The initial value is `GL_RENDER`. See `glRenderMode`.
`GL_RESCALE_NORMAL`
  `params` returns single boolean value indicating whether normal rescaling is enabled. See `glEnable`.
`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. Initially the x and y window coordinates are both 0 and the width and height are set to the size of the window. See `glScissor`.
`GL_SCISSOR_TEST`
  `params` returns a single boolean value indicating whether scissoring is enabled. The initial value is `GL_FALSE`. See `glScissor`.
`GL_SELECTION_BUFFER_SIZE`
  `params` return one value, the size of the selection buffer. See `glSelectBuffer`.
`GL_SEPARABLE_2D`
  `params` returns a single boolean value indicating whether 2D separable convolution is enabled. The initial value is `GL_FALSE`. See `glSeparableFilter2D`.
`GL_SHADE_MODEL`
  `params` returns one value, a symbolic constant indicating whether the shading mode is flat or smooth. The initial value is `GL_SMOOTH`. See `glShadeModel`.
`GL_SMOOTH_LINE_WIDTH_RANGE`
  `params` returns two values, the smallest and largest supported widths for antialiased lines. See `glLineWidth`.
`GL_SMOOTH_LINE_WIDTH_GRANULARITY`
  `params` returns one value, the granularity of widths for antialiased lines. See `glLineWidth`.
`GL_SMOOTH_POINT_SIZE_RANGE`
  `params` returns two values, the smallest and largest supported widths for antialiased points. See `glPointSize`.
`GL_SMOOTH_POINT_SIZE_GRANULARITY`
  `params` returns one value, the granularity of sizes for antialiased points. See `glPointSize`.
`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. The initial value is 0. See `glClearStencil`.
`GL_STENCIL_FAIL`
  `params` returns one value, a symbolic constant indicating what action is taken when the stencil test fails. The initial value is `GL_KEEP`. 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. The initial value is `GL_ALWAYS`. 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. The initial value is `GL_KEEP`. 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. The initial value is `GL_KEEP`. See `glStencilOp`.
`GL_STENCIL_REF`
  `params` returns one value, the reference value that is compared with the contents of the stencil buffer. The initial value is 0. See `glStencilFunc`.
`GL_STENCIL_TEST`
  `params` returns a single boolean value indicating whether stencil testing of fragments is enabled. The initial value is `GL_FALSE`. 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. The initial value is all 1's. See `glStencilFunc`.
`GL_STENCIL_WRITEMASK`
  `params` returns one value, the mask that controls writing of the stencil bitplanes. The initial value is all 1's. See `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. The initial value is 4.
`GL_TEXTURE_1D`
  `params` returns a single boolean value indicating whether 1D texture mapping is enabled. The initial value is `GL_FALSE`. See `glTexImage1D`.
`GL_TEXTURE_BINDING_1D`
  `params` returns a single value, the name of the texture currently bound to the target `GL_TEXTURE_1D`. The initial value is 0. See `glBindTexture`.
`GL_TEXTURE_2D`
  `params` returns a single boolean value indicating whether 2D texture mapping is enabled. The initial value is `GL_FALSE`. See `glTexImage2D`.
`GL_TEXTURE_BINDING_2D`
  `params` returns a single value, the name of the texture currently bound to the target `GL_TEXTURE_2D`. The initial value is 0. See `glBindTexture`.
`GL_TEXTURE_3D`
  `params` returns a single boolean value indicating whether 3D texture mapping is enabled. The initial value is `GL_FALSE`. See `glTexImage3D`.
`GL_TEXTURE_BINDING_3D`
  `params` returns a single value, the name of the texture currently bound to the target `GL_TEXTURE_3D`. The initial value is 0. See `glBindTexture`.
`GL_TEXTURE_COORD_ARRAY`
  `params` returns a single boolean value indicating whether the texture coordinate array is enabled. The initial value is `GL_FALSE`. See `glTexCoordPointer`.
`GL_TEXTURE_COORD_ARRAY_SIZE`
  `params` returns one value, the number of coordinates per element in the texture coordinate array. The initial value is 4. See `glTexCoordPointer`.
`GL_TEXTURE_COORD_ARRAY_STRIDE`
  `params` returns one value, the byte offset between consecutive elements in the texture coordinate array. The initial value is 0. See `glTexCoordPointer`.
`GL_TEXTURE_COORD_ARRAY_TYPE`
  `params` returns one value, the data type of the coordinates in the texture coordinate array. The initial value is `GL_FLOAT`. See `glTexCoordPointer`.
`GL_TEXTURE_GEN_Q`
  `params` returns a single boolean value indicating whether automatic generation of the `q` texture coordinate is enabled. The initial value is `GL_FALSE`. See `glTexGen`.
`GL_TEXTURE_GEN_R`
  `params` returns a single boolean value indicating whether automatic generation of the `r` texture coordinate is enabled. The initial value is `GL_FALSE`. See `glTexGen`.
`GL_TEXTURE_GEN_S`
  `params` returns a single boolean value indicating whether automatic generation of the `S` texture coordinate is enabled. The initial value is `GL_FALSE`. See `glTexGen`.
`GL_TEXTURE_GEN_T`
  `params` returns a single boolean value indicating whether automatic generation of the T texture coordinate is enabled. The initial value is `GL_FALSE`. See `glTexGen`.
`GL_TEXTURE_MATRIX`
  `params` returns sixteen values: the texture matrix on the top of the texture matrix stack. Initially this matrix is the identity matrix. See `glPushMatrix`.
`GL_TEXTURE_STACK_DEPTH`
  `params` returns one value, the number of matrices on the texture matrix stack. The initial value is 1. See `glPushMatrix`.
`GL_UNPACK_ALIGNMENT`
  `params` returns one value, the byte alignment used for reading pixel data from memory. The initial value is 4. See `glPixelStore`.
`GL_UNPACK_IMAGE_HEIGHT`
  `params` returns one value, the image height used for reading pixel data from memory. The initial is 0. 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. The initial value is `GL_FALSE`. See `glPixelStore`.
`GL_UNPACK_ROW_LENGTH`
  `params` returns one value, the row length used for reading pixel data from memory. The initial value is 0. See `glPixelStore`.
`GL_UNPACK_SKIP_IMAGES`
  `params` returns one value, the number of pixel images skipped before the first pixel is read from memory. The initial value is 0. See `glPixelStore`.
`GL_UNPACK_SKIP_PIXELS`
  `params` returns one value, the number of pixel locations skipped before the first pixel is read from memory. The initial value is 0. See `glPixelStore`.
`GL_UNPACK_SKIP_ROWS`
  `params` returns one value, the number of rows of pixel locations skipped before the first pixel is read from memory. The initial value is 0. See `glPixelStore`.
`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. The initial value is `GL_FALSE`. See `glPixelStore`.
`GL_VERTEX_ARRAY`
  `params` returns a single boolean value indicating whether the vertex array is enabled. The initial value is `GL_FALSE`. See `glVertexPointer`.
`GL_VERTEX_ARRAY_SIZE`
  `params` returns one value, the number of coordinates per vertex in the vertex array. The initial value is 4. See `glVertexPointer`.
`GL_VERTEX_ARRAY_STRIDE`
  `params` returns one value, the byte offset between consecutive vertexes in the vertex array. The initial value is 0. See `glVertexPointer`.
`GL_VERTEX_ARRAY_TYPE`
  `params` returns one value, the data type of each coordinate in the vertex array. The initial value is `GL_FLOAT`. See `glVertexPointer`.
`GL_VIEWPORT`
  `params` 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 `glViewport`.
`GL_ZOOM_X`
  `params` returns one value, the x pixel zoom factor. The initial value is 1. See `glPixelZoom`.
`GL_ZOOM_Y`
  `params` returns one value, the y pixel zoom factor. The initial value is 1. See `glPixelZoom`.

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

## Notes

`GL_COLOR_LOGIC_OP`, `GL_COLOR_ARRAY`, `GL_COLOR_ARRAY_SIZE`, `GL_COLOR_ARRAY_STRIDE`, `GL_COLOR_ARRAY_TYPE`, `GL_EDGE_FLAG_ARRAY`, `GL_EDGE_FLAG_ARRAY_STRIDE`, `GL_INDEX_ARRAY`, `GL_INDEX_ARRAY_STRIDE`, `GL_INDEX_ARRAY_TYPE`, `GL_INDEX_LOGIC_OP`, `GL_NORMAL_ARRAY`, `GL_NORMAL_ARRAY_STRIDE`, `GL_NORMAL_ARRAY_TYPE`, `GL_POLYGON_OFFSET_UNITS`, `GL_POLYGON_OFFSET_FACTOR`, `GL_POLYGON_OFFSET_FILL`, `GL_POLYGON_OFFSET_LINE`, `GL_POLYGON_OFFSET_POINT`, `GL_TEXTURE_COORD_ARRAY`, `GL_TEXTURE_COORD_ARRAY_SIZE`, `GL_TEXTURE_COORD_ARRAY_STRIDE`, `GL_TEXTURE_COORD_ARRAY_TYPE`, `GL_VERTEX_ARRAY`, `GL_VERTEX_ARRAY_SIZE`, `GL_VERTEX_ARRAY_STRIDE`, and `GL_VERTEX_ARRAY_TYPE` are available only if the GL version is 1.1 or greater.

`GL_ALIASED_POINT_SIZE_RANGE`, `GL_ALIASED_POINT_SIZE_GRANULARITY`, `GL_FEEDBACK_BUFFER_SIZE`, `GL_FEEDBACK_BUFFER_TYPE`, `GL_LIGHT_MODEL_AMBIENT`, `GL_LIGHT_MODEL_COLOR_CONTROL`, `GL_MAX_3D_TEXTURE_SIZE`, `GL_MAX_ELEMENTS_INDICES`, `GL_MAX_ELEMENTS_VERTICES`, `GL_PACK_IMAGE_HEIGHT`, `GL_PACK_SKIP_IMAGES`, `GL_RESCALE_NORMAL`, `GL_SELECTION_BUFFER_SIZE`, `GL_SMOOTH_LINE_WIDTH_GRANULARITY`, `GL_SMOOTH_LINE_WIDTH_RANGE`, `GL_SMOOTH_POINT_SIZE_GRANULARITY`, `GL_SMOOTH_POINT_SIZE_RANGE`, `GL_TEXTURE_3D`, `GL_TEXTURE_BINDING_3D`, `GL_UNPACK_IMAGE_HEIGHT`, and `GL_UNPACK_SKIP_IMAGES` are available only if the GL version is 1.2 or greater.

`GL_LINE_WIDTH_GRANULARITY` was deprecated in GL version 1.2. Its functionality was replaced by `GL_SMOOTH_LINE_WIDTH_GRANULARITY`.

`GL_LINE_WIDTH_RANGE` was deprecated in GL version 1.2. Its functionality was replaced by `GL_SMOOTH_LINE_WIDTH_RANGE`.

`GL_POINT_SIZE_GRANULARITY` was deprecated in GL version 1.2. Its functionality was replaced by `GL_SMOOTH_POINT_SIZE_GRANULARITY`.

`GL_POINT_SIZE_RANGE` was deprecated in GL version 1.2. Its functionality was replaced by `GL_SMOOTH_POINT_SIZE_RANGE`.

`GL_BLEND_COLOR`, `GL_BLEND_EQUATION`, `GL_COLOR_MATRIX`, `GL_COLOR_MATRIX_STACK_DEPTH`, `GL_COLOR_TABLE`, `GL_CONVOLUTION_1D`, `GL_CONVOLUTION_2D`, `GL_HISTOGRAM`, `GL_MAX_COLOR_MATRIX_STACK_DEPTH`, `GL_MINMAX`, `GL_POST_COLOR_MATRIX_COLOR_TABLE`, `GL_POST_COLOR_MATRIX_RED_BIAS`, `GL_POST_COLOR_MATRIX_GREEN_BIAS`, `GL_POST_COLOR_MATRIX_BLUE_BIAS`, `GL_POST_COLOR_MATRIX_ALPHA_BIAS`, `GL_POST_COLOR_MATRIX_RED_SCALE`, `GL_POST_COLOR_MATRIX_GREEN_SCALE`, `GL_POST_COLOR_MATRIX_BLUE_SCALE`, `GL_POST_COLOR_MATRIX_ALPHA_SCALE`, `GL_POST_CONVOLUTION_COLOR_TABLE`, `GL_POST_CONVOLUTION_RED_BIAS`, `GL_POST_CONVOLUTION_GREEN_BIAS`, `GL_POST_CONVOLUTION_BLUE_BIAS`, `GL_POST_CONVOLUTION_ALPHA_BIAS`, `GL_POST_CONVOLUTION_RED_SCALE`, `GL_POST_CONVOLUTION_GREEN_SCALE`, `GL_POST_CONVOLUTION_BLUE_SCALE`, `GL_POST_CONVOLUTION_ALPHA_SCALE`, and `GL_SEPARABLE_2D` are available only if `GL_ARB_imaging` is returned from `glGet` when called with the argument `GL_EXTENSIONS`.

`GL_ACTIVE_TEXTURE_ARB`, `GL_CLIENT_ACTIVE_TEXTURE_ARB`, and `GL_MAX_TEXTURE_UNITS_ARB` are available only if `GL_ARB_multitexture` is returned from `glGet` when called with the argument `GL_EXTENSIONS`.

When the `GL_ARB_multitexture` extension is supported, the following parameters return the associated value for the active texture unit: `GL_CURRENT_RASTER_TEXTURE_COORDS`, `GL_TEXTURE_1D`, `GL_TEXTURE_BINDING_1D`, `GL_TEXTURE_2D`, `GL_TEXTURE_BINDING_2D`, `GL_TEXTURE_3D`, `GL_TEXTURE_BINDING_3D`, `GL_TEXTURE_GEN_S`, `GL_TEXTURE_GEN_T`, `GL_TEXTURE_GEN_R`, `GL_TEXTURE_GEN_Q`, `GL_TEXTURE_MATRIX`, and `GL_TEXTURE_STACK_DEPTH`. Likewise, the following parameters return the associated value for the active client texture unit: `GL_TEXTURE_COORD_ARRAY`, `GL_TEXTURE_COORD_ARRAY_SIZE`, `GL_TEXTURE_COORD_ARRAY_STRIDE`, `GL_TEXTURE_COORD_ARRAY_TYPE`.

## Errors

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

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

## See Also

glGetClipPlane, glGetColorTable, glGetColorTableParameter, glGetConvolutionFilter, glGetConvolutionParameter, glGetError, glGetHistogram, glGetHistogramParameter, glGetLight, glGetMap, glGetMaterial, glGetMinmax, glGetMinmaxParameter, glGetPixelMap, glGetPointerv, glGetPolygonStipple, glGetSeparableFilter, glGetString, glGetTexEnv, glGetTexGen, glGetTexImage, glGetTexLevelParameter, glGetTexParameter, glIsEnabled

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