Returns the value or values of a selected parameter.
OpenGL C bindings library: libGL.a
void glGetBooleanv(GLenum ParameterName, GLBoolean *ParameterValuess)
void glGetDoublev(GLenum ParameterName, GLdouble *ParameterValues)
void glGetFloatv(GLenum ParameterName, GLfloat *ParameterValues)
void glGetIntegerv(GLenum ParameterName, GLint ParameterValues)
The four commands, glGetBooleanv, glGetDoublev, glGetFloatv, and glGetIntegerv, return values for simple-state variables in GL. ParameterName is a symbolic constant indicating the state variable to be returned, and ParameterValues is a pointer to an array of the indicated type in which to place the returned data.
Type conversion is performed if ParameterValues 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 (zero). Otherwise, it is converted to GL_TRUE. If glGetIntegerv is called, Boolean values are returned as GL_TRUE or GL_FALSE, and most floating-point values are rounded to the nearest integer value. Floating-point colors and normals, however, are returned with a linear mapping that maps 1.0 to the most positive representable integer value, and -1.0 to the most negative representable integer value. If either 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 ParameterName:
| GL_ACCUM_ALPHA_BITS | ParameterValues returns one value, the number of alpha bit planes in the accumulation buffer. |
| GL_ACCUM_BLUE_BITS | ParameterValues returns one value, the number of blue bit planes in the accumulation buffer. |
| GL_ACCUM_CLEAR_VALUE | ParameterValues returns four values: the red, green, blue, and alpha (RGBA) values used to clear the accumulation buffer. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glClearAccum.) |
| GL_ACCUM_GREEN_BITS | ParameterValues returns one value, the number of green bit planes in the accumulation buffer. |
| GL_ACCUM_RED_BITS | ParameterValues returns one value, the number of red bit planes in the accumulation buffer. |
| GL_ALPHA_BIAS | ParameterValues returns one value, the alpha bias factor used during pixel transfers. (See glPixelTransfer.) |
| GL_ALPHA_BITS | ParmeterValues returns one value, the number of alpha bit planes in each color buffer. |
| GL_ALPHA_SCALE | ParameterValues returns one value, the alpha scale factor used during pixel transfers. (See glPixelTransfer.) |
| GL_ALPHA_TEST | ParameterValues returns a single Boolean value indicating whether alpha testing of fragments is enabled. (See glAlphaFunc.) |
| GL_ALPHA_TEST_FUNC | ParameterValues returns one value, the symbolic name of the alpha test function. (See glAlphaFunc.) |
| GL_ALPHA_TEST_REF | ParameterValues returns one value, the reference value for the alpha test. (See glAlphaFunc.) An integer value, if requested, is linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. |
| GL_ARRAY_ELEMENT_LOCK_FIRST_EXT | ParameterValues returns one value, the first element in the locked range. (See glLockArraysEXT.) |
| GL_ARRAY_ELEMENT_LOCK_COUNT_EXT | ParameterValues returns one value, the count of elements in the locked range. (See glLockArraysEXT.) |
| GL_ATTRIB_STACK_DEPTH | ParameterValues returns one value, the depth of the attribute stack. If the stack is empty, 0 is returned. (See glPushAttrib.) |
| GL_AUTO_NORMAL | ParameterValues returns a single Boolean value indicating whether two-dimensional (2D) map evaluation automatically generates surface normals. (See glMap2.) |
| GL_AUX_BUFFERS | ParameterValues returns one value, the number of auxiliary color buffers. |
| GL_BLEND | ParameterValues returns a single Boolean value indicating whether blending is enabled. (See glBlendFunc.) |
| GL_BLEND_DST | ParameterValues returns one value, the symbolic constant identifying the destination blend function. (See glBlendFunc.) |
| GL_BLEND_EQUATION_EXT | ParameterValues returns one value, a symbolic constant indicating the blend equation. (See glBlendEquationEXT.) |
| GL_BLEND_SRC | ParameterValues returns one value, the symbolic constant identifying the source blend function. (See glBlendFunc.) |
| GL_BLUE_BIAS | ParameterValues returns one value, the blue bias factor used during pixel transfers. (See glPixelTransfer.) |
| GL_BLUE_BITS | ParameterValues returns one value, the number of blue bit planes in each color buffer. |
| GL_CLIENT_ATTRIB_STACK_DEPTH | ParameterValues returns one value indicating the depth of the attribute stack. The initial value is 0. (See glPushClientAttrib.) |
| GL_BLUE_SCALE | ParameterValues returns one value, the blue scale factor used during pixel transfers. (See glPixelTransfer.) |
| GL_CLIP_PLANE | ParameterValues returns a single Boolean value indicating whether the specified clipping plane is enabled. (See glClipPlane.) |
| GL_COLOR_ARRAY | ParameterValues returns a single Boolean value indicating whether the color array is enabled. The initial value is GL_FALSE. (See glColorPointer.) |
| GL_COLOR_ARRAY_COUNT_EXT | ParameterName returns one value, the number of colors in the color array, counting from the first, that are static. (See glColorPointerEXT.) |
| GL_COLOR_ARRAY_EXT | ParameterValues returns a single boolean value, indicating whether the color array is enabled. (See glColorPointerEXT.) |
| GL_COLOR_ARRAY_SIZE | ParameterValues returns one value, the number of components per color in the color array. The initial value is 4. (See glColorPointer.) |
| GL_COLOR_ARRAY_SIZE_EXT | ParameterValues returns one value, the number of components per color in the color array. (See glColorPointerEXT.) |
| GL_COLOR_ARRAY_STRIDE | ParameterValues returns one value, the byte offset between consecutive colors in the color array. The initial value is 0. (See glColorPointer.) |
| GL_COLOR_ARRAY_STRIDE_EXT | ParameterName returns one value, the byte offset between consecutive colors in the color array. (See glColorPointerEXT.) |
| GL_COLOR_ARRAY_TYPE | ParameterValues returns one value, the data type of each component in the color array. The initial value is GL_FLOAT. (See glColorPointer.) |
| GL_COLOR_ARRAY_TYPE_EXT | ParameterValues returns one value, the data type of each component in the color array. (See glColorPointerEXT.) |
| GL_COLOR_CLEAR_VALUE | ParameterValues returns four values: the RGBA values used to clear the color buffers. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glClearColor.) |
| GL_COLOR_LOGIC_OP | ParameterValues returns a single Boolean value indicating whether a fragment's color values are merged into the framebuffer using a logical operation. The initial value is GL_FALSE. (See glLogicOp.) |
| GL_COLOR_MATERIAL | ParameterValues returns a single Boolean value indicating whether one or more material parameters are tracking the current color. (See glColorMaterial.) |
| GL_COLOR_MATERIAL_FACE | ParameterValues returns one value, a symbolic constant indicating which materials have a parameter that is tracking the current color. (See glColorMaterial.) |
| GL_COLOR_MATERIAL_PARAMETER | ParameterValues returns one value, a symbolic constant indicating which material parameters are tracking the current color. (See glColorMaterial.) |
| GL_COLOR_WRITEMASK | ParameterValues returns four Boolean values: the RGBA write enables for the color buffers. (See glColorMask.) |
| GL_CULL_FACE | ParameterValues returns a single Boolean value indicating whether polygon culling is enabled. (See glCullFace.) |
| GL_CULL_FACE_MODE | ParameterValues returns one value, a symbolic constant indicating which polygon faces are to be culled. (See glCullFace.) |
| GL_CURRENT_COLOR | ParameterValues returns four values: the RGBA values of the current color. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glColor.) |
| GL_CURRENT_INDEX | ParameterValues returns one value, the current color index. (See glIndex.) |
| GL_CURRENT_NORMAL | ParameterValues returns three values: the x, y, and z values of the current normal. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glNormal.) |
| GL_CURRENT_RASTER_COLOR | ParameterValues returns four values: the RGBA values of the current raster position. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glRasterPos.) |
| GL_CURRENT_RASTER_DISTANCE | ParameterValues returns one value, the distance from the eye to the current raster position. The initial value is 0. (See glRasterPos.) |
| GL_CURRENT_RASTER_INDEX | ParameterValues returns one value, the color index of the current raster position. (See glRasterPos.) |
| GL_CURRENT_RASTER_POSITION | ParameterValues returns four values: the x, y, z, and w components of the current raster position. x, y, and z are in window coordinates, w is in clip coordinates. (See glRasterPos.) |
| GL_CURRENT_RASTER_TEXTURE_COORDS | ParameterValues returns four values: the s, t, r, and q current raster texture coordinates. (See glRasterPos and glTexCoord.) |
| GL_CURRENT_RASTER_POSITION_VALID | ParameterValues returns a single Boolean value indicating whether the current raster position is valid. (See glRasterPos.) |
| GL_CURRENT_TEXTURE_COORDS | ParameterValues returns four values: the s, t, r, and q current texture coordinates. (See glTexCoord.) |
| GL_DEPTH_BIAS | ParameterValues returns one value, the depth bias factor used during pixel transfers. (See glPixelTransfer.) |
| GL_DEPTH_BITS | ParameterValues returns one value, the number of bit planes in the depth buffer. |
| GL_DEPTH_CLEAR_VALUE | ParameterValues returns one value, the value that is used to clear the depth buffer. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glClearDepth.) |
| GL_DEPTH_FUNC | ParameterValues returns one value, the symbolic constant that indicates the depth comparison function. (See glDepthFunc.) |
| GL_DEPTH_RANGE | ParameterValues returns two values: the near and far mapping limits for the depth buffer. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glDepthRange.) |
| GL_DEPTH_SCALE | ParameterValues returns one value, the depth scale factor used during pixel transfers. (See glPixelTransfer.) |
| GL_DEPTH_TEST | ParameterValues returns a single Boolean value indicating whether depth testing of fragments is enabled. (See glDepthFunc and glDepthRange.) |
| GL_DEPTH_WRITEMASK | ParameterValues returns a single Boolean value indicating if the depth buffer is enabled for writing. (See glDepthMask.) |
| GL_DITHER | ParameterValues returns a single Boolean value indicating whether dithering of fragment colors and indices is enabled. |
| GL_DOUBLEBUFFER | ParameterValues returns a single Boolean value indicating whether double buffering is supported. |
| GL_DRAW_BUFFER | ParameterValues returns one value, a symbolic constant indicating which buffers are being drawn to. (See glDrawBuffer.) |
| GL_EDGE_FLAG | ParameterValues returns a single Boolean value indicating whether the current edge flag is True or False. (See glEdgeFlag.) |
| GL_EDGE_FLAG_ARRAY | ParameterValues 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_COUNT_EXT | ParameterValues returns one value, the number of edge flags in the edge flag array, counting from the first, that are static. (See glEdgeFlagPointerEXT.) |
| GL_EDGE_FLAG_ARRAY_EXT | ParameterValues returns a single boolean value, indicating whether the edge flag array is enabled. (See glEdgeFlagPointerEXT.) |
| GL_EDGE_FLAG_ARRAY_STRIDE | ParameterValues returns one value, the byte offset between consecutive edge flags in the edge flag array. The initial value is 0. (See glEdgeFlagPointer.) |
| GL_EDGE_FLAG_ARRAY_STRIDE_EXT | ParameterValues returns one value, the byte offset between consecutive edge flags in the edge flag array. (See glEdgeFlagPointerEXT.) |
| GL_FOG | ParameterValues returns a single Boolean value indicating whether fogging is enabled. (See glFog.) |
| GL_FOG_COLOR | ParameterValues returns four values: the RGBA components of the fog color. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glFog.) |
| GL_FOG_DENSITY | ParameterValues returns one value, the fog density parameter. (See glFog.) |
| GL_FOG_END | ParameterValues returns one value, the end factor for the linear fog equation. (See glFog.) |
| GL_FOG_HINT | ParameterValues returns one value, a symbolic constant indicating the mode of the fog hint. (See glHint.) |
| GL_FOG_INDEX | ParameterValues returns one value, the fog color index. (See glFog.) |
| GL_FOG_MODE | ParameterValues returns one value, a symbolic constant indicating which fog equation is selected. (See glFog.) |
| GL_FOG_START | ParameterValues returns one value, the start factor for the linear fog equation. (See glFog.) |
| GL_FRONT_FACE | ParameterValues returns one value, a symbolic constant indicating whether clockwise or counterclockwise polygon winding is treated as frontfacing. (See glFrontFace.) |
| GL_FUNC_ADD_EXT | ParameterValues returns one value, specifying the blending equation defined in the GL Specification be used. |
| GL_FUNC_SUBTRACT_EXT | |
| GL_GREEN_BIAS | ParameterValues returns one value, the green bias factor used during pixel transfers. |
| GL_GREEN_BITS | ParameterValues returns one value, the number of green bit planes in each color buffer. |
| GL_GREEN_SCALE | ParameterValues returns one value, the green scale factor used during pixel transfers. (See glPixelTransfer.) |
| GL_INDEX_ARRAY | ParameterValues returns a single Boolean value indicating whether the color index array is enabled. The initial value is GL_FALSE. (See glIndexPointer.) |
| GL_INDEX_ARRAY_COUNT_EXT | ParameterValues returns one value, the number of color indexes in the color index array, counting from the first, that are static. (See glIndexPointerEXT.) |
| GL_INDEX_ARRAY_EXT | ParameterValues returns a single boolean value, indicating whether the color index array is enabled. (See glIndexPointerEXT.) |
| GL_INDEX_ARRAY_STRIDE | ParameterValues 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_STRIDE_EXT | ParameterValues returns one value, the byte offset between consecutive color indexes in the color index array. (See glIndexPointerEXT.) |
| GL_INDEX_ARRAY_TYPE | ParameterValues returns one value, the data type of indexes in the color index array. The initial value is GL_FLOAT. (See glIndexPointer.) |
| GL_INDEX_ARRAY_TYPE_EXT | ParameterValues returns one value, the data type of indexes in the color index array. (See glIndexPointerEXT.) |
| GL_INDEX_BITS | ParameterValues returns one value, the number of bit planes in each color index buffer. |
| GL_INDEX_CLEAR_VALUE | ParameterValues returns one value, the color index used to clear the color index buffers. (See glClearIndex.) |
| GL_INDEX_MODE | ParameterValues returns a single Boolean value indicating whether the GL is in color index mode (True) or RGBA mode (False). |
| GL_INDEX_OFFSET | ParameterValues returns one value, the offset added to color and stencil indices during pixel transfers. (See glPixelTransfer.) |
| GL_INDEX_SHIFT | ParameterValues returns one value, the amount that color and stencil indices are shifted during pixel transfers. (See glPixelTransfer.) |
| GL_INDEX_WRITEMASK | ParameterValues returns one value, a mask indicating which bit planes of each color index buffer can be written. (See glIndexMask.) |
| GL_LIGHT# (where # is 1...n) | ParameterValues returns a single Boolean value indicating whether the specified light is enabled. (See glLight and glLightModel.) |
| GL_LIGHTING | ParameterValues returns a single Boolean value indicating whether lighting is enabled. (See glLightModel.) |
| GL_LIGHT_MODEL_AMBIENT | ParameterValues returns four values: the RGBA components of the ambient intensity of the entire scene. Integer values, if requested, are linearly mapped from the internal floating-point representation such that 1.0 returns the most positive representable integer value, and -1.0 returns the most negative representable integer value. (See glLightModel.) |
| GL_LIGHT_MODEL_LOCAL_VIEWER | ParameterValues returns a single Boolean value indicating whether specular reflection calculations treat the viewer as being local to the scene. (See glLightModel.) |
| GL_LIGHT_MODEL_TWO_SIDE | ParameterValues returns a single Boolean value indicating whether separate materials are used to compute lighting for frontfacing and backfacing polygons. (See glLightModel.) |
| GL_LINE_SMOOTH | ParameterValues returns a single Boolean value indicating whether antialiasing of lines is enabled. (See glLineWidth.) |
| GL_LINE_SMOOTH_HINT | ParameterValues returns one value, a symbolic constant indicating the mode of the line antialiasing hint. (See glHint). |
| GL_LINE_STIPPLE | ParameterValues returns a single Boolean value indicating whether stippling of lines is enabled. (See glLineStipple.) |
| GL_LINE_STIPPLE_PATTERN | ParameterValues returns one value, the 16-bit line stipple pattern. (See glLineStipple.) |
| GL_LINE_STIPPLE_REPEAT | ParameterValues returns one value, the line stipple repeat factor. (See glLineStipple.) |
| GL_LINE_WIDTH | ParameterValues returns one value, the line width as specified with glLineWidth. |
| GL_LINE_WIDTH_GRANULARITY | ParameterValues returns one value, the width difference between adjacent supported widths for antialiased lines. (See glLineWidth.) |
| GL_LINE_WIDTH_RANGE | ParameterValues returns two values: the smallest and largest supported widths for antialiased lines. (See glLineWidth.) |
| GL_LIST_BASE | ParameterValues returns one value, the base offset added to all names in arrays presented to glCallLists. (See glListBase.) |
| GL_LIST_INDEX | ParameterValues returns one value, the name of the display list currently under construction. If no display list is currently under construction, 0 is returned. (See glNewList.) |
| GL_LIST_MODE | ParameterValues returns one value, a symbolic constant indicating the construction mode of the display list currently being constructed. (See glNewList.) |
| GL_LOGIC_OP | ParameterValues returns a single Boolean value indicating whether fragment indexes are merged into the frame buffer using a logical operation. (See glLogicOp.) |
| GL_LOGIC_OP_MODE | ParameterValues returns one value, a symbolic constant indicating the selected logic operational mode. (See glLogicOp.) |
| GL_MAP1_COLOR_4 | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates colors. (See glMap1.) |
| GL_MAP1_GRID_DOMAIN | ParameterValues returns two values: the endpoints of the one-dimensional (1D) map's grid domain. (See glMapGrid.) |
| GL_MAP1_GRID_SEGMENTS | ParameterValues returns one value, the number of partitions in the 1D map's grid domain. (See glMapGrid.) |
| GL_MAP1_INDEX | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates color indices. (See glMap1.) |
| GL_MAP1_NORMAL | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates normals. (See glMap1.) |
| GL_MAP1_TEXTURE_COORD_1 | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates 1D texture coordinates. (See glMap1.) |
| GL_MAP1_TEXTURE_COORD_2 | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates 2D texture coordinates. (See glMap1.) |
| GL_MAP1_TEXTURE_COORD_3 | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates 3D texture coordinates. (See glMap1.) |
| GL_MAP1_TEXTURE_COORD_4 | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates 4D texture coordinates. (See glMap1.) |
| GL_MAP1_VERTEX_3 | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates 3D vertex coordinates. (See glMap1.) |
| GL_MAP1_VERTEX_4 | ParameterValues returns a single Boolean value indicating whether 1D evaluation generates 4D vertex coordinates. (See glMap1.) |
| GL_MAP2_COLOR_4 | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates colors. (See glMap2.) |
| GL_MAP2_GRID_DOMAIN | ParameterValues returns four values: the endpoints of the 2D map's i and j grid domains. (See glMapGrid.) |
| GL_MAP2_GRID_SEGMENTS | ParameterValues returns two values: the number of partitions in the 2D map's i and j grid domains. (See glMapGrid.) |
| GL_MAP2_INDEX | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates color indices. (See glMap2.) |
| GL_MAP2_NORMAL | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates normals. (See glMap2.) |
| GL_MAP2_TEXTURE_COORD_1 | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates 1D texture coordinates. (See glMap2.) |
| GL_MAP2_TEXTURE_COORD_2 | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates 2D texture coordinates. (See glMap2.) |
| GL_MAP2_TEXTURE_COORD_3 | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates 3D texture coordinates. (See glMap2.) |
| GL_MAP2_TEXTURE_COORD_4 | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates 4D texture coordinates. (See glMap2.) |
| GL_MAP2_VERTEX_3 | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates 3D vertex coordinates. (See glMap2.) |
| GL_MAP2_VERTEX_4 | ParameterValues returns a single Boolean value indicating whether 2D evaluation generates 4D vertex coordinates. (See glMap2.) |
| GL_MAP_COLOR | ParameterValues returns a single Boolean value indicating if colors and color indices are to be replaced by table lookup during pixel transfers. (See glPixelTransfer.) |
| GL_MAP_STENCIL | ParameterValues returns a single Boolean value indicating if stencil indices are to be replaced by table lookup during pixel transfers. (See glPixelTransfer.) |
| GL_MATRIX_MODE | ParameterValues returns one value, a symbolic constant indicating which matrix stack is currently the target of all matrix operations. (See glMatrixMode.) |
| GL_MAX_3D_TEXTURE_SIZE_EXT | ParameterValues returns one value, the maximum width, height, or depth of any 3D texture image (without borders). (See glTexImage3DEXT.) |
| GL_MAX_ATTRIB_STACK_DEPTH | ParameterValues returns one value, the maximum supported depth of the attribute stack. (See glPushAttrib.) |
| GL_MAX_CLIENT_ATTRIB_STACK_DEPTH | ParameterValues returns one value indicating the maximum supported depth of the client attribute stack. (See glPushClientAttrib.) |
| GL_MAX_CLIP_PLANES | ParameterValues returns one value, the maximum number of application-defined clipping planes. (See glClipPlane.) |
| GL_MAX_EVAL_ORDER | ParameterValues returns one value, the maximum equation order supported by 1D and 2D evaluators. (See glMap1 and glMap2.) |
| GL_MAX_LIGHTS | ParameterValues returns one value, the maximum number of lights. (See glLight.) |
| GL_MAX_LIST_NESTING | ParameterValues returns one value, the maximum recursion depth allowed during display list traversal. (See glCallList.) |
| GL_MAX_MODELVIEW_STACK_DEPTH | ParameterValues returns one value, the maximum supported depth of the modelview matrix stack. (See glPushMatrix.) |
| GL_MAX_NAME_STACK_DEPTH | ParameterValues returns one value, the maximum supported depth of the selection name stack. (See glPushName.) |
| GL_MAX_PIXEL_MAP_TABLE | ParameterValues returns one value, the maximum supported size of a glPixelMap lookup table. (See glPixelMap.) |
| GL_MAX_PROJECTION_STACK_DEPTH | ParameterValues returns one value, the maximum supported depth of the projection matrix stack. (See glPushMatrix.) |
| GL_MAX_TEXTURE_SIZE | ParameterValues returns one value, the maximum width or height of any texture image (without borders). (See glTexImage1D and glTexImage2D.) |
| GL_MAX_TEXTURE_STACK_DEPTH | ParameterValues returns one value, the maximum supported depth of the texture matrix stack. (See glPushMatrix.) |
| GL_MAX_VIEWPORT_DIMS | ParameterValues returns two values: the maximum supported width and height of the viewport. (See glViewport.) |
| GL_MODELVIEW_MATRIX | ParameterValues returns 16 values: the modelview matrix on the top of the modelview matrix stack. (See glPushMatrix.) |
| GL_MODELVIEW_STACK_DEPTH | ParameterValues returns one value, the number of matrices on the modelview matrix stack. (See glPushMatrix.) |
| GL_NAME_STACK_DEPTH | ParameterValues returns one value, the number of names on the selection name stack. (See glPushMatrix.) |
| GL_NORMAL_ARRAY | ParameterValues returns a single Boolean value, indicating whether the normal array is enabled. The initial value is GL_FALSE. (See glNormalPointer.) |
| GL_NORMAL_ARRAY_COUNT_EXT | ParameterValues returns one value, the number of normals in the normal array, counting from the first, that are static. (See glNormalPointerEXT.) |
| GL_NORMAL_ARRAY_EXT | ParameterValues returns a single boolean value, indicating whether the normal array is enabled. (See glNormalPointerEXT.) |
| GL_NORMAL_ARRAY_STRIDE | ParameterValues returns one value, the byte offset between consecutive normals in the normal array. The initial value is 0. (See glNormalPointer.) |
| GL_NORMAL_ARRAY_STRIDE_EXT | ParameterValues returns one value, the byte offset between consecutive normals in the normal array. (See glNormalPointerEXT.) |
| GL_NORMAL_ARRAY_TYPE | ParameterValues returns one value, the data type of each coordinate in the normal array. The initial value is GL_FLOAT. (See glNormalPointer.) |
| GL_NORMAL_ARRAY_TYPE_EXT | ParameterValues returns one value, the data type of each coordinate in the normal array. (See glNormalPointerEXT.) |
| GL_NORMALIZE | ParameterValues returns a single Boolean value indicating whether normals are automatically scaled to unit length after they have been transformed to eye coordinates. (See glNormal.) |
| GL_PACK_ALIGNMENT | ParameterValues returns one value, the byte alignment used for writing pixel data to memory. (See glPixelStore.) |
| GL_PACK_IMAGE_HEIGHT_EXT | ParameterValues returns one value, the number of image rows used for writing 3D pixel data to memory. (See glPixelStore.) |
| GL_PACK_LSB_FIRST | ParameterValues returns a single Boolean value indicating whether single-bit pixels being written to memory are written first to the least significant bit of each unsigned byte. (See glPixelStore.) |
| GL_PACK_ROW_LENGTH | ParameterValues returns one value, the row length used for writing pixel data to memory. (See glPixelStore.) |
| GL_PACK_SKIP_IMAGES_EXT | ParameterValues returns one value, the number of 2D images skipped before the first pixel of a 3D image is written into memory. (See glPixelStore.) |
| GL_PACK_SKIP_PIXELS | ParameterValues returns one value, the number of pixel locations skipped before the first pixel is written into memory. (See glPixelStore.) |
| GL_PACK_SKIP_ROWS | ParameterValues returns one value, the number of rows of pixel locations skipped before the first pixel is written into memory. (See glPixelStore.) |
| GL_PACK_SWAP_BYTES | ParameterValues returns a single Boolean value indicating whether the bytes of 2-byte and 4-byte pixel indices and components are swapped before being written to memory. (See glPixelStore.) |
| GL_PERSPECTIVE_CORRECTION_HINT | ParameterValues returns one value, a symbolic constant indicating the mode of the perspective correction hint. (See glHint.) |
| GL_PIXEL_MAP_A_TO_A_SIZE | ParameterValues returns one value, the size of the alpha-to-alpha pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_B_TO_B_SIZE | ParameterValues returns one value, the size of the blue-to-blue pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_G_TO_G_SIZE | ParameterValues returns one value, the size of the green-to-green pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_I_TO_A_SIZE | ParameterValues returns one value, the size of the index-to-alpha pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_I_TO_B_SIZE | ParameterValues returns one value, the size of the index-to-blue pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_I_TO_G_SIZE | ParameterValues returns one value, the size of the index-to-green pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_I_TO_I_SIZE | ParameterValues returns one value, the size of the index-to-index pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_I_TO_R_SIZE | ParameterValues returns one value, the size of the index-to-red pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_R_TO_R_SIZE | ParameterValues returns one value, the size of the red-to-red pixel translation table. (See glPixelMap.) |
| GL_PIXEL_MAP_S_TO_S_SIZE | ParameterValues returns one value, the size of the stencil-to-stencil pixel translation table. (See glPixelMap.) |
| GL_POINT_SIZE | ParameterValues returns one value, the point size as specified by glPointSize. |
| GL_POINT_SIZE_GRANULARITY | ParameterValues returns one value, the size difference between adjacent supported sizes for antialiased points. (See glPointSize.) |
| GL_POINT_SIZE_RANGE | ParameterValues returns two values: the smallest and largest supported sizes for antialiased points. (See glPointSize.) |
| GL_POINT_SMOOTH | ParameterValues returns a single Boolean value indicating whether antialiasing of points is enabled. (See glPointSize.) |
| GL_POINT_SMOOTH_HINT | ParameterValues returns one value, a symbolic constant indicating the mode of the point antialiasing hint. (See glHint.) |
| GL_POLYGON_MODE | ParameterValues returns two values: symbolic constants indicating whether frontfacing and backfacing polygons are rasterized as points, lines, or filled polygons. (See glPolygonMode.) |
| GL_POLYGON_OFFSET_BIAS_EXT | ParameterValues returns one value, the constant which is added to the z value of each fragment generated when a polygon is rasterized. (See glPolygonOffsetEXT.) |
| GL_POLYGON_OFFSET_EXT | ParameterValues returns a single Boolean value indicating whether polygon offest is enabled. (See glPolygonOffsetEXT.) |
| GL_POLYGON_OFFSET_FACTOR | ParameterValues returns one value, the scaling factor used to determine the variable offset which is added to the depth value of each fragment generated when a polygon is rasterized. The initial value is 0.0. (See glPolygonOffset.) |
| GL_POLYGON_OFFSET_FACTOR_EXT | ParameterValues returns one value, the scaling factor used to determine the variable offset which is added to the z value of each fragment generated when a polygon is rasterized. (See glPolygonOffsetEXT.) |
| GL_POLYGON_OFFSET_FILL | ParameterValues 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 | ParameterValues 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 | ParameterValues 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_OFFSET_UNITS | ParameterValues returns one value, this value is multiplied by an implementation-specific value and then added to the z value of each fragment generated when a polygon is rasterized. The initial value is 0.0. (See glPolygonOffset.) |
| GL_POLYGON_SMOOTH | ParameterValues returns a single Boolean value indicating whether antialiasing of polygons is enabled. (See glPolygonMode.) |
| GL_POLYGON_SMOOTH_HINT | ParameterValues returns one value, a symbolic constant indicating the mode of the polygon antialiasing hint. (See glHint.) |
| GL_POLYGON_STIPPLE | ParameterValues returns a single Boolean value indicating whether stippling of polygons is enabled. (See glPolygonStipple.) |
| GL_PROJECTION_MATRIX | ParameterValues returns 16 values: the projection matrix on the top of the projection matrix stack. (See glPushMatrix.) |
| GL_PROJECTION_STACK_DEPTH | ParameterValues returns one value, the number of matrices on the projection matrix stack. (See glPushMatrix.) |
| GL_READ_BUFFER | ParameterValues returns one value, a symbolic constant indicating which color buffer is selected for reading. (See glReadPixels and glAccum.) |
| GL_RED_BIAS | ParameterValues returns one value, the red bias factor used during pixel transfers. |
| GL_RED_BITS | ParameterValues returns one value, the number of red bit planes in each color buffer. |
| GL_RED_SCALE | ParameterValues returns one value, the red scale factor used during pixel transfers. (See glPixelTransfer.) |
| GL_RENDER_MODE | ParameterValues returns one value, a symbolic constant indicating whether the GL is in render, select, or feedback mode. (See glRenderMode.) |
| GL_RGBA_MODE | ParameterValues returns a single Boolean value indicating whether the GL is in RGBA mode (True) or color index mode (False). (See glColor.) |
| GL_SCISSOR_BOX | ParameterValues returns four values: the x and y window coordinates of the scissor box, followed by its width and height. (See glScissor.) |
| GL_SCISSOR_TEST | ParameterValues returns a single Boolean value indicating whether scissoring is enabled. (See glScissor.) |
| GL_SHADE_MODEL | ParameterValues returns one value, a symbolic constant indicating whether the shading mode is flat or smooth. (See glShadeModel.) |
| GL_STENCIL_BITS | ParameterValues returns one value, the number of bit planes in the stencil buffer. |
| GL_STENCIL_CLEAR_VALUE | ParameterValues returns one value, the index to which the stencil bit planes are cleared. (See glClearStencil.) |
| GL_STENCIL_FAIL | ParameterValues returns one value, a symbolic constant indicating what action is taken when the stencil test fails. (See glStencilOp.) |
| GL_STENCIL_FUNC | ParameterValues returns one value, a symbolic constant indicating what function is used to compare the stencil reference value with the stencil buffer value. (See glStencilFunc.) |
| GL_STENCIL_PASS_DEPTH_FAIL | ParameterValues returns one value, a symbolic constant indicating what action is taken when the stencil test passes but the depth test fails. (See glStencilOp.) |
| GL_STENCIL_PASS_DEPTH_PASS | ParameterValues returns one value, a symbolic constant indicating what action is taken when the stencil test passes and the depth test passes. (See glStencilOp.) |
| GL_STENCIL_REF | ParameterValues returns one value, the reference value that is compared with the contents of the stencil buffer. (See glStencilFunc.) |
| GL_STENCIL_TEST | ParameterValues returns a single Boolean value indicating whether stencil testing of fragments is enabled. (See glStencilFunc and glStencilOp.) |
| GL_STENCIL_VALUE_MASK | ParameterValues returns one value, the mask that is used to mask both the stencil reference value and the stencil buffer value before they are compared. (See glStencilFunc.) |
| GL_STENCIL_WRITEMASK | ParameterValues returns one value, the mask that controls writing of the stencil bit planes. (See glStencilMask.) |
| GL_STEREO | ParameterValues returns a single Boolean value indicating whether stereo buffers (left and right) are supported. |
| GL_SUBPIXEL_BITS | ParameterValues returns one value, an estimate of the number of bits of subpixel resolution that are used to position rasterized geometry in window coordinates. |
| GL_TEXTURE_1D | ParameterValues returns a single Boolean value indicating whether 1D texture mapping is enabled. (See glTexImage1D.) |
| GL_TEXTURE_2D | ParameterValues returns a single Boolean value indicating whether 2D texture mapping is enabled. (See glTexImage2D.) |
| GL_TEXTURE_1D_BINDING | ParameterValues 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_1D_BINDING_EXT | ParameterValues returns a single value, the name of the texture currently bound to the target GL_TEXTURE_1D. (See glBindTextureEXT.) |
| GL_TEXTURE_2D_BINDING | ParameterValues 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_2D_BINDING_EXT | ParameterValues returns a single value, the name of the texture currently bound to the target GL_TEXTURE_2D. (See glBindTextureEXT.) |
| GL_TEXTURE_3D_BINDING_EXT | ParameterValues returns a single value, the name of the texture currently bound to the target GL_TEXTURE_3D_EXT. (See glBindTexture.) |
| GL_TEXTURE_3D_EXT | ParameterValues returns a single Boolean value indicating whether 3D texture mapping is enabled. (See glTexImage3DEXT.) |
| GL_TEXTURE_COORD_ARRAY | ParameterValues 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_COUNT_EXT | ParameterValues returns one value, the number of elements in the texture coordinate array, counting from the first, that are static. (See glTexCoordPointerEXT.) |
| GL_TEXTURE_COORD_ARRAY_EXT | ParameterValues returns a single boolean value, indicating whether the texture coordinate array is enabled. (See glTexCoordPointerEXT.) |
| GL_TEXTURE_COORD_ARRAY_SIZE | ParameterValues 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_SIZE_EXT | ParameterValues returns one value, the number of coordinates per element in the texture coordinate array. (See glTexCoordPointerEXT.) |
| GL_TEXTURE_COORD_ARRAY_STRIDE | ParameterValues 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_STRIDE_EXT | ParameterValues returns one value, the byte offset between consecutive elements in the texture coordinate array. (See glTexCoordPointerEXT.) |
| GL_TEXTURE_COORD_ARRAY_TYPE | ParameterValues returns one value, the data type of the coordinates in the texture coordinate array. The initial value is GL_FLOAT. (See glTexCoordPointer.) |
| GL_TEXTURE_COORD_ARRAY_TYPE_EXT | ParameterValues returns one value, the data type of the coordinates in the texture coordinate array. (See glTexCoordPointerEXT.) |
| GL_TEXTURE_ENV_COLOR | ParameterValues returns four values: the RGBA values of the texture environment 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 glTexEnv.) |
| GL_TEXTURE_ENV_MODE | ParameterValues returns one value, a symbolic constant indicating what texture environment function is currently selected. (See glTexEnv.) |
| GL_TEXTURE_GEN_S | ParameterValues returns a single Boolean value indicating whether automatic generation of the S texture coordinate is enabled. (See glTexGen.) |
| GL_TEXTURE_GEN_T | ParameterValues returns a single Boolean value indicating whether automatic generation of the T texture coordinate is enabled. (See glTexGen.) |
| GL_TEXTURE_GEN_R | ParameterValues returns a single Boolean value indicating whether automatic generation of the R texture coordinate is enabled. (See glTexGen.) |
| GL_TEXTURE_GEN_Q | ParameterValues returns a single Boolean value indicating whether automatic generation of the Q texture coordinate is enabled. (See glTexGen.) |
| GL_TEXTURE_MATRIX | ParameterValues returns 16 values: the texture matrix on the top of the texture matrix stack. (See glPushMatrix.) |
| GL_TEXTURE_STACK_DEPTH | ParameterValues returns one value, the maximum supported depth of the texture matrix stack. (See glPushMatrix.) |
| GL_UNPACK_ALIGNMENT | ParameterValues returns one value, the byte alignment used for reading pixel data from memory. (See glPixelStore.) |
| GL_UNPACK_IMAGE_HEIGHT_EXT | ParameterValues returns one value, the number of image rows used for reading 3D pixel data from memory. (See glPixelStore.) |
| GL_UNPACK_LSB_FIRST | ParameterValues returns a single Boolean value indicating whether single-bit pixels being read from memory are read first from the least significant bit of each unsigned byte. (See glPixelStore.) |
| GL_UNPACK_ROW_LENGTH | ParameterValues returns one value, the row length used for reading pixel data from memory. (See glPixelStore.) |
| GL_UNPACK_SKIP_IMAGES_EXT | ParameterValues returns one value, the number of 2D images skipped before the first pixel of a 3D image is read from memory. (See glPixelStore.) |
| GL_UNPACK_SKIP_PIXELS | ParameterValues returns one value, the number of pixel locations skipped before the first pixel is read from memory. (See glPixelStore.) |
| GL_UNPACK_SKIP_ROWS | ParameterValues returns one value, the number of rows of pixel locations skipped before the first pixel is read from memory. (See glPixelStore.) |
| GL_UNPACK_SWAP_BYTES | ParameterValues returns a single Boolean value indicating whether the bytes of 2-byte and 4-byte pixel indices and components are swapped after being read from memory. (See glPixelStore.) |
| GL_VERTEX_ARRAY | ParameterValues returns a single Boolean value indicating whether the vertex array is enabled. The initial value is GL_FALSE. (See glVertexPointer.) |
| GL_VERTEX_ARRAY_COUNT_EXT | ParameterValues returns one value, the number of vertexes in the vertex array, counting from the first, that are static. (See glVertexPointerEXT.) |
| GL_VERTEX_ARRAY_EXT | ParameterValues returns a single boolean value, indicating whether the vertex array is enabled. (See glVertexPointerEXT.) |
| GL_VERTEX_ARRAY_SIZE | ParameterValues returns one value, the number of coordinates per vertex in the vertex array. The initial value is 4. (See glVertexPointer.) |
| GL_VERTEX_ARRAY_SIZE_EXT | ParameterValues returns one value, the number of coordinates per vertex in the vertex array. (See glVertexPointerEXT.) |
| GL_VERTEX_ARRAY_STRIDE | ParameterValues returns one value, the byte offset between consecutive vertexes in the vertex array. The initial value is 0. (See glVertexPointer.) |
| GL_VERTEX_ARRAY_STRIDE_EXT | ParameterValues returns one value, the byte offset between consecutive vertexes in the vertex array. (See glVertexPointerEXT.) |
| GL_VERTEX_ARRAY_TYPE | ParameterValues returns one value, the data type of each coordinate in the vertex array. The initial value is GL_FLOAT. (See glVertexPointer.) |
| GL_VERTEX_ARRAY_TYPE_EXT | ParameterValues returns one value, the data type of each coordinate in the vertex array. (See glVertexPointerEXT.) |
| GL_VIEWPORT | ParameterValues returns four values: the x and y window coordinates of the viewport, followed by its width and height. (See glViewPort.) |
| GL_ZOOM_X | ParameterValues returns one value, the x pixel zoom factor. (See glPixelZoom.) |
| GL_ZOOM_Y | ParameterValues returns one value, the y pixel zoom factor. (See glPixelZoom.) |
Many of the Boolean parameters can also be queried more easily using glIsEnabled.
| GL_INVALID_ENUM | ParameterName is not an accepted value. |
| GL_INVALID_OPERATION | The glGet subroutine is called between a call to glBegin and the corresponding call to glEnd. |
| /usr/include/GL/gl.h | Contains C language constants, variable type definitions, and ANSI function prototypes for OpenGL. |
The glGetClipPlane subroutine, glGetError subroutine, glGetLight subroutine, glGetMap subroutine, glGetMaterial subroutine, glGetPixelMap subroutine, glGetPointerv subroutine, glGetPointervEXT subroutine, glGetPolygonStipple subroutine, glGetString subroutine, glGetTexEnv subroutine, glGetTexGen subroutine, glGetTexImage subroutine, glGetTexLevelParameter subroutine, glGetTexParameter subroutine, glIsEnabled subroutine.