Name

glGet — return the value or values of a selected parameter

C Specification

void glGetBooleanv(GLenum pname,
 GLboolean * params);
 

C Specification

void glGetDoublev(GLenum pname,
 GLdouble * params);
 

C Specification

void glGetFloatv(GLenum pname,
 GLfloat * params);
 

C Specification

void glGetIntegerv(GLenum pname,
 GLint * params);
 

Parameters

pname

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

params

Returns the value or values of the specified parameter.

Description

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

Type conversion is performed if params has a different type than the state variable value being requested. If glGetBooleanv is called, a floating-point (or integer) value is converted to GL_FALSE if and only if it is 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

params returns a single value indicating the active multitexture unit. The initial value is GL_TEXTURE0. See glActiveTexture.

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_ARRAY_BUFFER_BINDING

params returns a single value, the name of the buffer object currently bound to the target GL_ARRAY_BUFFER. If no buffer object is bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

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 available.

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_ALPHA

params returns one value, the symbolic constant identifying the alpha destination blend function. The initial value is GL_ZERO. See glBlendFunc and glBlendFuncSeparate.

GL_BLEND_DST_RGB

params returns one value, the symbolic constant identifying the RGB destination blend function. The initial value is GL_ZERO. See glBlendFunc and glBlendFuncSeparate.

GL_BLEND_EQUATION_RGB

params returns one value, a symbolic constant indicating whether the RGB blend equation is GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MIN or GL_MAX. See glBlendEquationSeparate.

GL_BLEND_EQUATION_ALPHA

params returns one value, a symbolic constant indicating whether the Alpha blend equation is GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, GL_MIN or GL_MAX. See glBlendEquationSeparate.

GL_BLEND_SRC_ALPHA

params returns one value, the symbolic constant identifying the alpha source blend function. The initial value is GL_ONE. See glBlendFunc and glBlendFuncSeparate.

GL_BLEND_SRC_RGB

params returns one value, the symbolic constant identifying the RGB source blend function. The initial value is GL_ONE. See glBlendFunc and glBlendFuncSeparate.

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

params returns a single integer value indicating the current client active multitexture unit. The initial value is GL_TEXTURE0. See glClientActiveTexture.

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_PLANEi

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_BUFFER_BINDING

params returns a single value, the name of the buffer object associated with the color array. This buffer object would have been bound to the target GL_ARRAY_BUFFER at the time of the most recent call to glColorPointer. If no buffer object was bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

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_SUM

params returns a single boolean value indicating whether primary and secondary color sum is enabled. See glSecondaryColor.

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_COMPRESSED_TEXTURE_FORMATS

params returns a list of symbolic constants of length GL_NUM_COMPRESSED_TEXTURE_FORMATS indicating which compressed texture formats are available. See glCompressedTexImage2D.

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. The initial value is (1, 1, 1, 1). See glColor.

GL_CURRENT_FOG_COORD

params returns one value, the current fog coordinate. The initial value is 0. See glFogCoord.

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_PROGRAM

params returns one value, the name of the program object that is currently active, or 0 if no program object is active. See glUseProgram.

GL_CURRENT_RASTER_COLOR

params returns four values: the red, green, blue, and alpha color 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_SECONDARY_COLOR

params returns four values: the red, green, blue, and alpha secondary color 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_TEXTURE_COORDS

params returns four values: the s, t, r, and q texture coordinates of the current raster position. The initial value is (0, 0, 0, 1). See glRasterPos and glMultiTexCoord.

GL_CURRENT_SECONDARY_COLOR

params returns four values: the red, green, blue, and alpha values of the current secondary 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 glSecondaryColor.

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 glMultiTexCoord.

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_DRAW_BUFFERi

params returns one value, a symbolic constant indicating which buffers are being drawn to by the corresponding output color. See glDrawBuffers. The initial value of GL_DRAW_BUFFER0 is GL_BACK if there are back buffers, otherwise it is GL_FRONT. The initial values of draw buffers for all other output colors is GL_NONE.

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_BUFFER_BINDING

params returns a single value, the name of the buffer object associated with the edge flag array. This buffer object would have been bound to the target GL_ARRAY_BUFFER at the time of the most recent call to glEdgeFlagPointer. If no buffer object was bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

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_ELEMENT_ARRAY_BUFFER_BINDING

params returns a single value, the name of the buffer object currently bound to the target GL_ELEMENT_ARRAY_BUFFER. If no buffer object is bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

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_COORD_ARRAY

params returns a single boolean value indicating whether the fog coordinate array is enabled. The initial value is GL_FALSE. See glFogCoordPointer.

GL_FOG_COORD_ARRAY_BUFFER_BINDING

params returns a single value, the name of the buffer object associated with the fog coordinate array. This buffer object would have been bound to the target GL_ARRAY_BUFFER at the time of the most recent call to glFogCoordPointer. If no buffer object was bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

GL_FOG_COORD_ARRAY_STRIDE

params returns one value, the byte offset between consecutive fog coordinates in the fog coordinate array. The initial value is 0. See glFogCoordPointer.

GL_FOG_COORD_ARRAY_TYPE

params returns one value, the type of the fog coordinate array. The initial value is GL_FLOAT. See glFogCoordPointer.

GL_FOG_COORD_SRC

params returns one value, a symbolic constant indicating the source of the fog coordinate. The initial value is GL_FRAGMENT_DEPTH. 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_FRAGMENT_SHADER_DERIVATIVE_HINT

params returns one value, a symbolic constant indicating the mode of the derivative accuracy hint for fragment shaders. The initial value is GL_DONT_CARE. See glHint.

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_GENERATE_MIPMAP_HINT

params returns one value, a symbolic constant indicating the mode of the mipmap generation filtering hint. The initial value is GL_DONT_CARE. See glHint.

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_BUFFER_BINDING

params returns a single value, the name of the buffer object associated with the color index array. This buffer object would have been bound to the target GL_ARRAY_BUFFER at the time of the most recent call to glIndexPointer. If no buffer object was bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

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_LIGHTi

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. The value must be at least 16. 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_COMBINED_TEXTURE_IMAGE_UNITS

params returns one value, the maximum supported texture image units that can be used to access texture maps from the vertex shader and the fragment processor combined. If both the vertex shader and the fragment processing stage access the same texture image unit, then that counts as using two texture image units against this limit. The value must be at least 2. See glActiveTexture.

GL_MAX_CUBE_MAP_TEXTURE_SIZE

params returns one value. The value gives a rough estimate of the largest cube-map texture that the GL can handle. The value must be at least 16. If the GL version is 1.3 or greater, use GL_PROXY_TEXTURE_CUBE_MAP to determine if a texture is too large. See glTexImage2D.

GL_MAX_DRAW_BUFFERS

params returns one value, the maximum number of simultaneous output colors allowed from a fragment shader using the gl_FragData built-in array. The value must be at least 1. See glDrawBuffers.

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_FRAGMENT_UNIFORM_COMPONENTS

params returns one value, the maximum number of individual floating-point, integer, or boolean values that can be held in uniform variable storage for a fragment shader. The value must be at least 64. See glUniform.

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_COORDS

params returns one value, the maximum number of texture coordinate sets available to vertex and fragment shaders. The value must be at least 2. See glActiveTexture and glClientActiveTexture.

GL_MAX_TEXTURE_IMAGE_UNITS

params returns one value, the maximum supported texture image units that can be used to access texture maps from the fragment shader. The value must be at least 2. See glActiveTexture.

GL_MAX_TEXTURE_LOD_BIAS

params returns one value, the maximum, absolute value of the texture level-of-detail bias. The value must be at least 4.

GL_MAX_TEXTURE_SIZE

params returns one value. The value gives a rough estimate of the largest texture that the GL can handle. The value must be at least 64. 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

params returns a single value indicating the number of conventional texture units supported. Each conventional texture unit includes both a texture coordinate set and a texture image unit. Conventional texture units may be used for fixed-function (non-shader) rendering. The value must be at least 2. Additional texture coordinate sets and texture image units may be accessed from vertex and fragment shaders. See glActiveTexture and glClientActiveTexture.

GL_MAX_VARYING_FLOATS

params returns one value, the maximum number of interpolators available for processing varying variables used by vertex and fragment shaders. This value represents the number of individual floating-point values that can be interpolated; varying variables declared as vectors, matrices, and arrays will all consume multiple interpolators. The value must be at least 32.

GL_MAX_VERTEX_ATTRIBS

params returns one value, the maximum number of 4-component generic vertex attributes accessible to a vertex shader. The value must be at least 16. See glVertexAttrib.

GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS

params returns one value, the maximum supported texture image units that can be used to access texture maps from the vertex shader. The value may be 0. See glActiveTexture.

GL_MAX_VERTEX_UNIFORM_COMPONENTS

params returns one value, the maximum number of individual floating-point, integer, or boolean values that can be held in uniform variable storage for a vertex shader. The value must be at least 512. See glUniform.

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_BUFFER_BINDING

params returns a single value, the name of the buffer object associated with the normal array. This buffer object would have been bound to the target GL_ARRAY_BUFFER at the time of the most recent call to glNormalPointer. If no buffer object was bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

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_NUM_COMPRESSED_TEXTURE_FORMATS

params returns a single integer value indicating the number of available compressed texture formats. The minimum value is 0. See glCompressedTexImage2D.

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_PIXEL_PACK_BUFFER_BINDING

params returns a single value, the name of the buffer object currently bound to the target GL_PIXEL_PACK_BUFFER. If no buffer object is bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

GL_PIXEL_UNPACK_BUFFER_BINDING

params returns a single value, the name of the buffer object currently bound to the target GL_PIXEL_UNPACK_BUFFER. If no buffer object is bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

GL_POINT_DISTANCE_ATTENUATION

params returns three values, the coefficients for computing the attenuation value for points. See glPointParameter.

GL_POINT_FADE_THRESHOLD_SIZE

params returns one value, the point size threshold for determining the point size. See glPointParameter.

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_MAX

params returns one value, the upper bound for the attenuated point sizes. The initial value is 0.0. See glPointParameter.

GL_POINT_SIZE_MIN

params returns one value, the lower bound for the attenuated point sizes. The initial value is 1.0. See glPointParameter.

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_POINT_SPRITE

params returns a single boolean value indicating whether point sprite is enabled. The initial value is GL_FALSE.

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_SAMPLE_BUFFERS

params returns a single integer value indicating the number of sample buffers associated with the framebuffer. See glSampleCoverage.

GL_SAMPLE_COVERAGE_VALUE

params returns a single positive floating-point value indicating the current sample coverage value. See glSampleCoverage.

GL_SAMPLE_COVERAGE_INVERT

params returns a single boolean value indicating if the temporary coverage value should be inverted. See glSampleCoverage.

GL_SAMPLES

params returns a single integer value indicating the coverage mask size. See glSampleCoverage.

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_SECONDARY_COLOR_ARRAY

params returns a single boolean value indicating whether the secondary color array is enabled. The initial value is GL_FALSE. See glSecondaryColorPointer.

GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING

params returns a single value, the name of the buffer object associated with the secondary color array. This buffer object would have been bound to the target GL_ARRAY_BUFFER at the time of the most recent call to glSecondaryColorPointer. If no buffer object was bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

GL_SECONDARY_COLOR_ARRAY_SIZE

params returns one value, the number of components per color in the secondary color array. The initial value is 3. See glSecondaryColorPointer.

GL_SECONDARY_COLOR_ARRAY_STRIDE

params returns one value, the byte offset between consecutive colors in the secondary color array. The initial value is 0. See glSecondaryColorPointer.

GL_SECONDARY_COLOR_ARRAY_TYPE

params returns one value, the data type of each component in the secondary color array. The initial value is GL_FLOAT. See glSecondaryColorPointer.

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_BACK_FAIL

params returns one value, a symbolic constant indicating what action is taken for back-facing polygons when the stencil test fails. The initial value is GL_KEEP. See glStencilOpSeparate.

GL_STENCIL_BACK_FUNC

params returns one value, a symbolic constant indicating what function is used for back-facing polygons to compare the stencil reference value with the stencil buffer value. The initial value is GL_ALWAYS. See glStencilFuncSeparate.

GL_STENCIL_BACK_PASS_DEPTH_FAIL

params returns one value, a symbolic constant indicating what action is taken for back-facing polygons when the stencil test passes, but the depth test fails. The initial value is GL_KEEP. See glStencilOpSeparate.

GL_STENCIL_BACK_PASS_DEPTH_PASS

params returns one value, a symbolic constant indicating what action is taken for back-facing polygons when the stencil test passes and the depth test passes. The initial value is GL_KEEP. See glStencilOpSeparate.

GL_STENCIL_BACK_REF

params returns one value, the reference value that is compared with the contents of the stencil buffer for back-facing polygons. The initial value is 0. See glStencilFuncSeparate.

GL_STENCIL_BACK_VALUE_MASK

params returns one value, the mask that is used for back-facing polygons to mask both the stencil reference value and the stencil buffer value before they are compared. The initial value is all 1's. See glStencilFuncSeparate.

GL_STENCIL_BACK_WRITEMASK

params returns one value, the mask that controls writing of the stencil bitplanes for back-facing polygons. The initial value is all 1's. See glStencilMaskSeparate.

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. If the GL version is 2.0 or greater, this stencil state only affects non-polygons and front-facing polygons. Back-facing polygons use separate stencil state. See glStencilOpSeparate.

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. If the GL version is 2.0 or greater, this stencil state only affects non-polygons and front-facing polygons. Back-facing polygons use separate stencil state. See glStencilFuncSeparate.

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. If the GL version is 2.0 or greater, this stencil state only affects non-polygons and front-facing polygons. Back-facing polygons use separate stencil state. See glStencilOpSeparate.

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. If the GL version is 2.0 or greater, this stencil state only affects non-polygons and front-facing polygons. Back-facing polygons use separate stencil state. See glStencilOpSeparate.

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. If the GL version is 2.0 or greater, this stencil state only affects non-polygons and front-facing polygons. Back-facing polygons use separate stencil state. See glStencilFuncSeparate.

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. If the GL version is 2.0 or greater, this stencil state only affects non-polygons and front-facing polygons. Back-facing polygons use separate stencil state. See glStencilFuncSeparate.

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. If the GL version is 2.0 or greater, this stencil state only affects non-polygons and front-facing polygons. Back-facing polygons use separate stencil state. See glStencilMaskSeparate.

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 value must be at least 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_BINDING_CUBE_MAP

params returns a single value, the name of the texture currently bound to the target GL_TEXTURE_CUBE_MAP. The initial value is 0. See glBindTexture.

GL_TEXTURE_COMPRESSION_HINT

params returns a single value indicating the mode of the texture compression hint. The initial value is GL_DONT_CARE.

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_BUFFER_BINDING

params returns a single value, the name of the buffer object associated with the texture coordinate array. This buffer object would have been bound to the target GL_ARRAY_BUFFER at the time of the most recent call to glTexCoordPointer. If no buffer object was bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

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_CUBE_MAP

params returns a single boolean value indicating whether cube-mapped texture mapping is enabled. The initial value is GL_FALSE. See glTexImage2D.

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_TRANSPOSE_COLOR_MATRIX

params returns 16 values, the elements of the color matrix in row-major order. See glLoadTransposeMatrix.

GL_TRANSPOSE_MODELVIEW_MATRIX

params returns 16 values, the elements of the modelview matrix in row-major order. See glLoadTransposeMatrix.

GL_TRANSPOSE_PROJECTION_MATRIX

params returns 16 values, the elements of the projection matrix in row-major order. See glLoadTransposeMatrix.

GL_TRANSPOSE_TEXTURE_MATRIX

params returns 16 values, the elements of the texture matrix in row-major order. See glLoadTransposeMatrix.

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_BUFFER_BINDING

params returns a single value, the name of the buffer object associated with the vertex array. This buffer object would have been bound to the target GL_ARRAY_BUFFER at the time of the most recent call to glVertexPointer. If no buffer object was bound to this target, 0 is returned. The initial value is 0. See glBindBuffer.

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 vertices 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_VERTEX_PROGRAM_POINT_SIZE

params returns a single boolean value indicating whether vertex program point size mode is enabled. If enabled, and a vertex shader is active, then the point size is taken from the shader built-in gl_PointSize. If disabled, and a vertex shader is active, then the point size is taken from the point state as specified by glPointSize. The initial value is GL_FALSE.

GL_VERTEX_PROGRAM_TWO_SIDE

params returns a single boolean value indicating whether vertex program two-sided color mode is enabled. If enabled, and a vertex shader is active, then the GL chooses the back color output for back-facing polygons, and the front color output for non-polygons and front-facing polygons. If disabled, and a vertex shader is active, then the front color output is always selected. The initial value is GL_FALSE.

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_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_COMPRESSED_TEXTURE_FORMATS, GL_NUM_COMPRESSED_TEXTURE_FORMATS, GL_TEXTURE_BINDING_CUBE_MAP, and GL_TEXTURE_COMPRESSION_HINT are available only if the GL version is 1.3 or greater.

GL_BLEND_DST_ALPHA, GL_BLEND_DST_RGB, GL_BLEND_SRC_ALPHA, GL_BLEND_SRC_RGB, GL_CURRENT_FOG_COORD, GL_CURRENT_SECONDARY_COLOR, GL_FOG_COORD_ARRAY_STRIDE, GL_FOG_COORD_ARRAY_TYPE, GL_FOG_COORD_SRC, GL_MAX_TEXTURE_LOD_BIAS, GL_POINT_SIZE_MIN, GL_POINT_SIZE_MAX, GL_POINT_FADE_THRESHOLD_SIZE, GL_POINT_DISTANCE_ATTENUATION, GL_SECONDARY_COLOR_ARRAY_SIZE, GL_SECONDARY_COLOR_ARRAY_STRIDE, and GL_SECONDARY_COLOR_ARRAY_TYPE are available only if the GL version is 1.4 or greater.

GL_ARRAY_BUFFER_BINDING, GL_COLOR_ARRAY_BUFFER_BINDING, GL_EDGE_FLAG_ARRAY_BUFFER_BINDING, GL_ELEMENT_ARRAY_BUFFER_BINDING, GL_FOG_COORD_ARRAY_BUFFER_BINDING, GL_INDEX_ARRAY_BUFFER_BINDING, GL_NORMAL_ARRAY_BUFFER_BINDING, GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING, GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING, and GL_VERTEX_ARRAY_BUFFER_BINDING are available only if the GL version is 1.5 or greater.

GL_BLEND_EQUATION_ALPHA, GL_BLEND_EQUATION_RGB, GL_DRAW_BUFFERi, GL_FRAGMENT_SHADER_DERIVATIVE_HINT, GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, GL_MAX_DRAW_BUFFERS, GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, GL_MAX_TEXTURE_COORDS, GL_MAX_TEXTURE_IMAGE_UNITS, GL_MAX_VARYING_FLOATS, GL_MAX_VERTEX_ATTRIBS, GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, GL_MAX_VERTEX_UNIFORM_COMPONENTS, GL_POINT_SPRITE, GL_STENCIL_BACK_FAIL, GL_STENCIL_BACK_FUNC, GL_STENCIL_BACK_PASS_DEPTH_FAIL, GL_STENCIL_BACK_PASS_DEPTH_PASS, GL_STENCIL_BACK_REF, GL_STENCIL_BACK_VALUE_MASK, GL_STENCIL_BACK_WRITEMASK, GL_VERTEX_PROGRAM_POINT_SIZE, and GL_VERTEX_PROGRAM_TWO_SIDE are available only if the GL version is 2.0 or greater.

GL_CURRENT_RASTER_SECONDARY_COLOR, GL_PIXEL_PACK_BUFFER_BINDING and GL_PIXEL_UNPACK_BUFFER_BINDING are available only if the GL version is 2.1 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_EQUATION was deprecated in GL version 2.0. Its functionality was replaced by GL_BLEND_EQUATION_RGB and GL_BLEND_EQUATION_ALPHA.

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 ARB_imaging is returned from glGet when called with the argument GL_EXTENSIONS.

When the ARB_multitexture extension is supported, or the GL version is 1.3 or greater, 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_BUFFER_BINDING, 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

glGetActiveAttrib, glGetActiveUniform, glGetAttachedShaders, glGetAttribLocation, glGetBufferParameteriv, glGetBufferPointerv, glGetBufferSubData, glGetClipPlane, glGetColorTable, glGetColorTableParameter, glGetCompressedTexImage, glGetConvolutionFilter, glGetConvolutionParameter, glGetError, glGetHistogram, glGetHistogramParameter, glGetLight, glGetMap, glGetMaterial, glGetMinmax, glGetMinmaxParameter, glGetPixelMap, glGetPointerv, glGetPolygonStipple, glGetProgram, glGetProgramInfoLog, glGetQueryiv, glGetQueryObject, glGetSeparableFilter, glGetShader, glGetShaderInfoLog, glGetShaderSource, glGetString, glGetTexEnv, glGetTexGen, glGetTexImage, glGetTexLevelParameter, glGetTexParameter, glGetUniform, glGetUniformLocation, glGetVertexAttrib, glGetVertexAttribPointerv, glIsEnabled

Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.