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glGetBooleanv glGetDoublev glGetFloatv glGetIntegerv

NAME

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

C SPECIFICATION

       void glGetBooleanv( GLenum pname,
                           GLboolean *params )

C SPECIFICATION

       void glGetDoublev( GLenum pname,
                          GLdouble *params )

C SPECIFICATION

       void glGetFloatv( GLenum pname,
                         GLfloat *params )

C SPECIFICATION

       void glGetIntegerv( GLenum pname,
                           GLint *params )

PARAMETERS

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

       params  Returns the value or values of the specified parameter.

DESCRIPTION

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

       Type conversion is performed if params has a different  type  than  the
       state  variable  value  being requested.  If glGetBooleanv is called, a
       floating-point (or integer) value is converted to GL_FALSE if and  only
       if  it  is  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 accu-
                                mulation    buffer.     Integer   values,   if
                                requested, are linearly mapped from the inter-
                                nal  floating-point  representation  such that
                                1.0 returns the  most  positive  representable
                                integer value, and -1.0 returns the most nega-
                                tive representable integer value. The  initial
                                value is (0, 0, 0, 0).  See glClearAccum.

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

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

       GL_ACTIVE_TEXTURE_ARB    params  returns  a single value indicating the
                                active multitexture unit.  The  initial  value
                                is GL_TEXTURE0_ARB.  See glActiveTextureARB.

       GL_ALIASED_POINT_SIZE_RANGE
                                params  returns  two  values, the smallest and
                                largest supported sizes for aliased points.

       GL_ALIASED_LINE_WIDTH_RANGE
                                params returns two values,  the  smallest  and
                                largest supported widths for aliased lines.

       GL_ALPHA_BIAS            params  returns one value, the alpha bias fac-
                                tor 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 fac-
                                tor  used  during pixel transfers. The initial
                                value is 1.  See glPixelTransfer.

       GL_ALPHA_TEST            params returns a single boolean value indicat-
                                ing  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  inter-
                                nal  floating-point  representation  such that
                                1.0 returns the  most  positive  representable
                                integer value, and -1.0 returns the most nega-
                                tive representable integer value.

       GL_ATTRIB_STACK_DEPTH    params returns one value,  the  depth  of  the
                                attribute  stack.  If the stack is empty, 0 is
                                returned.  The  initial  value  is   0.    See
                                glPushAttrib.

       GL_AUTO_NORMAL           params returns a single boolean value indicat-
                                ing 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 auxil-
                                iary color buffers. The initial value is 0.

       GL_BLEND                 params returns a single boolean value indicat-
                                ing 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  compo-
                                nents of the blend color.  See glBlendColor.

       GL_BLEND_DST             params  returns  one  value, the symbolic con-
                                stant identifying the destination blend  func-
                                tion.  The  initial  value  is  GL_ZERO.   See
                                glBlendFunc.

       GL_BLEND_EQUATION        params returns one value, a symbolic  constant
                                indicating   whether  the  blend  equation  is
                                GL_FUNC_ADD,    GL_MIN    or    GL_MAX.    See
                                glBlendEquation.

       GL_BLEND_SRC             params  returns  one  value, the symbolic con-
                                stant identifying the source  blend  function.
                                The initial value is GL_ONE.  See glBlendFunc.

       GL_BLUE_BIAS             params returns one value, the blue bias factor
                                used during pixel transfers. The initial value
                                is 0.  See glPixelTransfer.

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

       GL_BLUE_SCALE            params  returns one value, the blue scale fac-
                                tor used during pixel transfers.  The  initial
                                value is 1.  See glPixelTransfer.

       GL_CLIENT_ACTIVE_TEXTURE_ARB
                                params returns a single integer value indicat-
                                ing the  current  client  active  multitexture
                                unit.  The  initial  value is GL_TEXTURE0_ARB.
                                See glClientActiveTextureARB.

       GL_CLIENT_ATTRIB_STACK_DEPTH
                                params returns one value indicating the  depth
                                of  the  attribute stack. The initial value is
                                0.  See glPushClientAttrib.

       GL_CLIP_PLANEi           params returns a single boolean value indicat-
                                ing  whether  the  specified clipping plane is
                                enabled. The initial value is  GL_FALSE.   See
                                glClipPlane.

       GL_COLOR_ARRAY           params returns a single boolean value indicat-
                                ing whether the color array  is  enabled.  The
                                initial     value     is     GL_FALSE.     See
                                glColorPointer.

       GL_COLOR_ARRAY_SIZE      params returns one value, the number of compo-
                                nents  per  color in the color array. The ini-
                                tial 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 indicat-
                                ing 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 indicat-
                                ing  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 ini-
                                tial   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  sup-
                                ported  depth  of the projection matrix stack.
                                The  value  must   be   at   least   2.    See
                                glPushMatrix.

       GL_COLOR_TABLE           params returns a single boolean value indicat-
                                ing whether the color table lookup is enabled.
                                See glColorTable.

       GL_COLOR_WRITEMASK       params  returns  four boolean values: the red,
                                green, blue, and alpha write enables  for  the
                                color  buffers. The initial value is (GL_TRUE,
                                GL_TRUE, GL_TRUE, GL_TRUE).  See  glColorMask.

       GL_CONVOLUTION_1D        params returns a single boolean value indicat-
                                ing whether 1D  convolution  is  enabled.  The
                                initial     value     is     GL_FALSE.     See
                                glConvolutionFilter1D.

       GL_CONVOLUTION_2D        params returns a single boolean value indicat-
                                ing  whether  2D  convolution  is enabled. The
                                initial    value     is     GL_FALSE.      See
                                glConvolutionFilter2D.

       GL_CULL_FACE             params returns a single boolean value indicat-
                                ing 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 repre-
                                sentation such that 1.0 returns the most posi-
                                tive  representable  integer  value,  and -1.0
                                returns the most negative representable  inte-
                                ger  value.  See glColor. The initial value is
                                (1, 1, 1, 1).

       GL_CURRENT_INDEX         params returns one value,  the  current  color
                                index. The initial value is 1.  See glIndex.

       GL_CURRENT_NORMAL        params  returns  three values: the x, y, and z
                                values of the current normal.  Integer values,
                                if  requested,  are  linearly  mapped from the
                                internal  floating-point  representation  such
                                that  1.0  returns  the  most  positive repre-
                                sentable integer value, and -1.0  returns  the
                                most  negative  representable  integer  value.
                                The initial value is (0, 0, 1). See  glNormal.

       GL_CURRENT_RASTER_COLOR  params  returns  four  values: the red, green,
                                blue, and alpha values of the  current  raster
                                position.   Integer  values, if requested, are
                                linearly mapped from  the  internal  floating-
                                point representation such that 1.0 returns the
                                most positive representable integer value, and
                                -1.0  returns  the most negative representable
                                integer value. The initial value is (1, 1,  1,
                                1).  See glRasterPos.

       GL_CURRENT_RASTER_DISTANCE
                                params  returns  one  value, the distance from
                                the eye to the current  raster  position.  The
                                initial value is 0.  See glRasterPos.

       GL_CURRENT_RASTER_INDEX  params  returns  one value, the color index of
                                the current raster position. The initial value
                                is 1.  See glRasterPos.

       GL_CURRENT_RASTER_POSITION
                                params returns four values: the x, y, z, and w
                                components of the current raster position.  x,
                                y,  and  z are in window coordinates, and w is
                                in clip coordinates. The initial value is  (0,
                                0, 0, 1).  See glRasterPos.

       GL_CURRENT_RASTER_POSITION_VALID
                                params returns a single boolean value indicat-
                                ing whether the  current  raster  position  is
                                valid.  The  initial  value  is  GL_TRUE.  See
                                glRasterPos.

       GL_CURRENT_RASTER_TEXTURE_COORDS
                                params returns four values: the s, t, r, and q
                                current  raster  texture coordinates. The ini-
                                tial value is (0, 0, 0, 1).   See  glRasterPos
                                and glTexCoord.

       GL_CURRENT_TEXTURE_COORDS
                                params returns four values: the s, t, r, and q
                                current texture coordinates. The initial value
                                is (0, 0, 0, 1).  See glTexCoord.

       GL_DEPTH_BIAS            params  returns one value, the depth bias fac-
                                tor used during pixel transfers.  The  initial
                                value is 0.  See glPixelTransfer.

       GL_DEPTH_BITS            params  returns  one value, the number of bit-
                                planes in the depth buffer.

       GL_DEPTH_CLEAR_VALUE     params returns one value, the  value  that  is
                                used  to clear the depth buffer.  Integer val-
                                ues, if requested, are  linearly  mapped  from
                                the   internal  floating-point  representation
                                such that 1.0 returns the most positive repre-
                                sentable  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 con-
                                stant  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 repre-
                                sentable  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 fac-
                                tor used during pixel transfers.  The  initial
                                value is 1.  See glPixelTransfer.

       GL_DEPTH_TEST            params returns a single boolean value indicat-
                                ing 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 indicat-
                                ing  if  the depth buffer is enabled for writ-
                                ing.  The  initial  value  is  GL_TRUE.    See
                                glDepthMask.

       GL_DITHER                params returns a single boolean value indicat-
                                ing whether dithering of fragment  colors  and
                                indices  is  enabled.  The  initial  value  is
                                GL_TRUE.

       GL_DOUBLEBUFFER          params returns a single boolean value indicat-
                                ing whether double buffering is supported.

       GL_DRAW_BUFFER           params  returns one value, a symbolic constant
                                indicating which buffers are being  drawn  to.
                                See glDrawBuffer. The initial value is GL_BACK
                                if there are back  buffers,  otherwise  it  is
                                GL_FRONT.

       GL_EDGE_FLAG             params returns a single boolean value indicat-
                                ing 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 indicat-
                                ing  whether  the  edge flag array is enabled.
                                The   initial   value   is   GL_FALSE.     See
                                glEdgeFlagPointer.

       GL_EDGE_FLAG_ARRAY_STRIDE
                                params  returns  one  value,  the  byte offset
                                between consecutive edge  flags  in  the  edge
                                flag  array.  The  initial  value  is  0.  See
                                glEdgeFlagPointer.

       GL_FEEDBACK_BUFFER_SIZE  params returns one  value,  the  size  of  the
                                feedback buffer.  See glFeedbackBuffer.

       GL_FEEDBACK_BUFFER_TYPE  params  returns  one  value,  the  type of the
                                feedback buffer.  See glFeedbackBuffer.

       GL_FOG                   params returns a single boolean value indicat-
                                ing  whether  fogging  is enabled. The initial
                                value is GL_FALSE.  See glFog.

       GL_FOG_COLOR             params returns four values:  the  red,  green,
                                blue,  and  alpha components of the fog color.
                                Integer values,  if  requested,  are  linearly
                                mapped from the internal floating-point repre-
                                sentation such that 1.0 returns the most posi-
                                tive  representable  integer  value,  and -1.0
                                returns the most negative representable  inte-
                                ger  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 ini-
                                tial value is GL_DONT_CARE.  See glHint.

       GL_FOG_INDEX             params returns one value, the fog color index.
                                The initial value is 0.  See glFog.

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

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

       GL_FRONT_FACE            params  returns one value, a symbolic constant
                                indicating whether clockwise or  counterclock-
                                wise  polygon winding is treated as front-fac-
                                ing.  The  initial  value  is   GL_CCW.    See
                                glFrontFace.

       GL_GREEN_BIAS            params  returns one value, the green bias fac-
                                tor 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 fac-
                                tor  used  during pixel transfers. The initial
                                value is 1.  See glPixelTransfer.

       GL_HISTOGRAM             params returns a single boolean value indicat-
                                ing  whether histogram is enabled. The initial
                                value is GL_FALSE.  See glHistogram.

       GL_INDEX_ARRAY           params returns a single boolean value indicat-
                                ing  whether the color index array is enabled.
                                The   initial   value   is   GL_FALSE.     See
                                glIndexPointer.

       GL_INDEX_ARRAY_STRIDE    params  returns  one  value,  the  byte offset
                                between consecutive color indexes in the color
                                index  array.  The  initial  value  is 0.  See
                                glIndexPointer.

       GL_INDEX_ARRAY_TYPE      params returns one value,  the  data  type  of
                                indexes  in the color index array. The initial
                                value is GL_FLOAT.  See glIndexPointer.

       GL_INDEX_BITS            params returns one value, the number  of  bit-
                                planes 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 indicat-
                                ing 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 indicat-
                                ing 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  trans-
                                fers.   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 indicat-
                                ing  whether  the  specified light is enabled.
                                The initial value is  GL_FALSE.   See  glLight
                                and glLightModel.

       GL_LIGHTING              params returns a single boolean value indicat-
                                ing 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 val-
                                ues, if requested, are  linearly  mapped  from
                                the   internal  floating-point  representation
                                such that 1.0 returns the most positive repre-
                                sentable  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  indi-
                                cating  whether  specular  reflection calcula-
                                tions are separated from normal lighting  com-
                                putations.      The     initial    value    is
                                GL_SINGLE_COLOR.

       GL_LIGHT_MODEL_LOCAL_VIEWER
                                params returns a single boolean value indicat-
                                ing  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 indicat-
                                ing  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 indicat-
                                ing  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 indicat-
                                ing 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 dis-
                                play  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 dis-
                                play 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 indicat-
                                ing  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 parti-
                                tions in the 1D map's grid domain. The initial
                                value is 1.  See glMapGrid.

       GL_MAP1_INDEX            params returns a single boolean value indicat-
                                ing  whether  1D  evaluation  generates  color
                                indices. The initial value is  GL_FALSE.   See
                                glMap1.

       GL_MAP1_NORMAL           params returns a single boolean value indicat-
                                ing whether 1D evaluation  generates  normals.
                                The initial value is GL_FALSE.  See glMap1.

       GL_MAP1_TEXTURE_COORD_1  params returns a single boolean value indicat-
                                ing 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 indicat-
                                ing 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 indicat-
                                ing 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 indicat-
                                ing 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 indicat-
                                ing 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 indicat-
                                ing  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 indicat-
                                ing 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 par-
                                titions 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 indicat-
                                ing  whether  2D  evaluation  generates  color
                                indices.  The  initial value is GL_FALSE.  See
                                glMap2.

       GL_MAP2_NORMAL           params returns a single boolean value indicat-
                                ing  whether  2D evaluation generates normals.
                                The initial value is GL_FALSE.  See glMap2.

       GL_MAP2_TEXTURE_COORD_1  params returns a single boolean value indicat-
                                ing 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 indicat-
                                ing 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 indicat-
                                ing 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 indicat-
                                ing 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 indicat-
                                ing  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 indicat-
                                ing whether 2D evaluation generates 4D  vertex
                                coordinates.  The  initial  value is GL_FALSE.
                                See glMap2.

       GL_MAP_COLOR             params returns a single boolean value indicat-
                                ing  if  colors  and  color  indices are to be
                                replaced by table lookup during  pixel  trans-
                                fers.  The  initial  value  is  GL_FALSE.  See
                                glPixelTransfer.

       GL_MAP_STENCIL           params returns a single boolean value indicat-
                                ing  if  stencil indices are to be replaced by
                                table lookup during pixel transfers. The  ini-
                                tial  value is GL_FALSE.  See glPixelTransfer.

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

       GL_MAX_3D_TEXTURE_SIZE   params  returns one value, a rough estimate of
                                the largest 3D texture that the GL can handle.
                                If  the  GL  version  is  1.2  or greater, use
                                GL_PROXY_TEXTURE_3D to determine if a  texture
                                is too large.  See glTexImage3D.

       GL_MAX_CLIENT_ATTRIB_STACK_DEPTH
                                params  returns one value indicating the maxi-
                                mum supported depth of  the  client  attribute
                                stack.  See glPushClientAttrib.

       GL_MAX_ATTRIB_STACK_DEPTH
                                params  returns  one  value,  the maximum sup-
                                ported 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 sup-
                                ported depth of the color matrix  stack.   The
                                value must be at least 2.  See glPushMatrix.

       GL_MAX_ELEMENTS_INDICES  params returns one value, the recommended max-
                                imum number  of  vertex  array  indices.   See
                                glDrawRangeElements.

       GL_MAX_ELEMENTS_VERTICES params returns one value, the recommended max-
                                imum number of  vertex  array  vertices.   See
                                glDrawRangeElements.

       GL_MAX_EVAL_ORDER        params returns one value, the maximum equation
                                order supported by 1D and 2D  evaluators.  The
                                value  must  be  at  least  8.  See glMap1 and
                                glMap2.

       GL_MAX_LIGHTS            params returns one value, the  maximum  number
                                of  lights. The value must be at least 8.  See
                                glLight.

       GL_MAX_LIST_NESTING      params returns one value, the  maximum  recur-
                                sion depth allowed during display-list traver-
                                sal. The value  must  be  at  least  64.   See
                                glCallList.

       GL_MAX_MODELVIEW_STACK_DEPTH
                                params  returns  one  value,  the maximum sup-
                                ported 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  sup-
                                ported  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  sup-
                                ported 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  sup-
                                ported  depth  of the projection matrix stack.
                                The  value  must   be   at   least   2.    See
                                glPushMatrix.

       GL_MAX_TEXTURE_SIZE      params  returns  one value.  The value gives a
                                rough estimate of the largest texture that the
                                GL  can  handle.   If the GL version is 1.1 or
                                greater,    use     GL_PROXY_TEXTURE_1D     or
                                GL_PROXY_TEXTURE_2D  to determine if a texture
                                is   too   large.    See   glTexImage1D    and
                                glTexImage2D.

       GL_MAX_TEXTURE_STACK_DEPTH
                                params  returns  one  value,  the maximum sup-
                                ported depth of the texture matrix stack.  The
                                value must be at least 2.  See glPushMatrix.

       GL_MAX_TEXTURE_UNITS_ARB params  returns  a single value indicating the
                                number of texture units supported.  The  value
                                must be at least 1.  See glActiveTextureARB.

       GL_MAX_VIEWPORT_DIMS     params  returns  two  values: the maximum sup-
                                ported  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 indicat-
                                ing 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 matri-
                                ces on the modelview matrix stack.   The  ini-
                                tial 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, indi-
                                cating whether the normal  array  is  enabled.
                                The    initial   value   is   GL_FALSE.    See
                                glNormalPointer.

       GL_NORMAL_ARRAY_STRIDE   params returns  one  value,  the  byte  offset
                                between  consecutive  normals  in  the  normal
                                array.  The   initial   value   is   0.    See
                                glNormalPointer.

       GL_NORMAL_ARRAY_TYPE     params  returns  one  value,  the data type of
                                each coordinate in the normal array. The  ini-
                                tial  value is GL_FLOAT.  See glNormalPointer.

       GL_NORMALIZE             params returns a single boolean value indicat-
                                ing  whether  normals are automatically scaled
                                to unit length after  they  have  been  trans-
                                formed  to  eye coordinates. The initial value
                                is GL_FALSE.  See glNormal.

       GL_PACK_ALIGNMENT        params returns one value, the  byte  alignment
                                used  for  writing  pixel  data to memory. The
                                initial value is 4.  See glPixelStore.

       GL_PACK_IMAGE_HEIGHT     params returns one  value,  the  image  height
                                used  for  writing  pixel data to memory.  The
                                initial value is 0.  See glPixelStore.

       GL_PACK_LSB_FIRST        params returns a single boolean value indicat-
                                ing whether single-bit pixels being written to
                                memory are written first to the least signifi-
                                cant  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 writ-
                                ten 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 indicat-
                                ing 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 correc-
                                tion  hint. The initial value is GL_DONT_CARE.
                                See glHint.

       GL_PIXEL_MAP_A_TO_A_SIZE params returns one  value,  the  size  of  the
                                alpha-to-alpha  pixel  translation table.  The
                                initial value is 1.  See glPixelMap.

       GL_PIXEL_MAP_B_TO_B_SIZE params returns one  value,  the  size  of  the
                                blue-to-blue  pixel  translation  table.   The
                                initial value is 1.  See glPixelMap.

       GL_PIXEL_MAP_G_TO_G_SIZE params returns one  value,  the  size  of  the
                                green-to-green  pixel  translation table.  The
                                initial value is 1.  See glPixelMap.

       GL_PIXEL_MAP_I_TO_A_SIZE params returns one  value,  the  size  of  the
                                index-to-alpha  pixel  translation table.  The
                                initial value is 1.  See glPixelMap.

       GL_PIXEL_MAP_I_TO_B_SIZE params returns one  value,  the  size  of  the
                                index-to-blue  pixel  translation  table.  The
                                initial value is 1.  See glPixelMap.

       GL_PIXEL_MAP_I_TO_G_SIZE params returns one  value,  the  size  of  the
                                index-to-green  pixel  translation table.  The
                                initial value is 1.  See glPixelMap.

       GL_PIXEL_MAP_I_TO_I_SIZE params returns one  value,  the  size  of  the
                                index-to-index  pixel  translation table.  The
                                initial value is 1.  See glPixelMap.

       GL_PIXEL_MAP_I_TO_R_SIZE params returns one  value,  the  size  of  the
                                index-to-red  pixel  translation  table.   The
                                initial value is 1.  See glPixelMap.

       GL_PIXEL_MAP_R_TO_R_SIZE params returns one value, the size of the red-
                                to-red  pixel  translation table.  The initial
                                value is 1.  See glPixelMap.

       GL_PIXEL_MAP_S_TO_S_SIZE params returns one  value,  the  size  of  the
                                stencil-to-stencil  pixel  translation  table.
                                The initial value is 1.  See glPixelMap.

       GL_POINT_SIZE            params returns one value, the  point  size  as
                                specified by glPointSize. The initial value is
                                1.

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

       GL_POINT_SIZE_RANGE      params returns two values:  the  smallest  and
                                largest   supported   sizes   for  antialiased
                                points. The smallest size must be at  most  1,
                                and  the largest size must be at least 1.  See
                                glPointSize.

       GL_POINT_SMOOTH          params returns a single boolean value indicat-
                                ing whether antialiasing of points is enabled.
                                The   initial   value   is   GL_FALSE.     See
                                glPointSize.

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

       GL_POLYGON_MODE          params returns two values: symbolic  constants
                                indicating  whether front-facing and back-fac-
                                ing 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 gen-
                                erated  when a polygon is rasterized. The ini-
                                tial value is 0.  See glPolygonOffset.

       GL_POLYGON_OFFSET_UNITS  params returns one value.  This value is  mul-
                                tiplied  by  an  implementation-specific value
                                and then added to  the  depth  value  of  each
                                fragment  generated  when a polygon is raster-
                                ized.   The   initial   value   is   0.    See
                                glPolygonOffset.

       GL_POLYGON_OFFSET_FILL   params returns a single boolean value indicat-
                                ing 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 indicat-
                                ing  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 indicat-
                                ing 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 indicat-
                                ing   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  antialias-
                                ing  hint.  The initial value is GL_DONT_CARE.
                                See glHint.

       GL_POLYGON_STIPPLE       params returns a single boolean value indicat-
                                ing  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 indicat-
                                ing 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 fac-
                                tor 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 fac-
                                tor 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 fac-
                                tor 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  fac-
                                tor  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 fac-
                                tor 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 indicat-
                                ing   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  fac-
                                tor  applied  to RGBA fragments after convolu-
                                tion.   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  fac-
                                tor  applied  to RGBA fragments after convolu-
                                tion.   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 fac-
                                tor  applied  to RGBA fragments after convolu-
                                tion.   The   initial   value   is   1.    See
                                glPixelTransfer.

       GL_POST_CONVOLUTION_BLUE_SCALE
                                params  returns one value, the blue scale fac-
                                tor applied to RGBA fragments  after  convolu-
                                tion.   The   initial   value   is   1.    See
                                glPixelTransfer.

       GL_POST_CONVOLUTION_ALPHA_SCALE
                                params returns one value, the alpha scale fac-
                                tor  applied  to RGBA fragments after convolu-
                                tion.   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 matri-
                                ces  on the projection matrix stack.  The ini-
                                tial 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 indicat-
                                ing  whether  the GL is in RGBA mode (true) or
                                color index mode (false).  See glColor.

       GL_SCISSOR_BOX           params returns four values: the x and y window
                                coordinates  of  the  scissor box, followed by
                                its width and height.  Initially the x  and  y
                                window  coordinates  are  both 0 and the width
                                and height are set to the size of the  window.
                                See glScissor.

       GL_SCISSOR_TEST          params returns a single boolean value indicat-
                                ing whether scissoring is enabled. The initial
                                value is GL_FALSE.  See glScissor.

       GL_SELECTION_BUFFER_SIZE params  return  one  value,  the  size  of the
                                selection buffer.  See glSelectBuffer.

       GL_SEPARABLE_2D          params returns a single boolean value indicat-
                                ing   whether   2D  separable  convolution  is
                                enabled. The initial value is  GL_FALSE.   See
                                glSeparableFilter2D.

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

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

       GL_SMOOTH_LINE_WIDTH_GRANULARITY
                                params returns one value, the  granularity  of
                                widths    for    antialiased    lines.     See
                                glLineWidth.

       GL_SMOOTH_POINT_SIZE_RANGE
                                params returns two values,  the  smallest  and
                                largest   supported   widths  for  antialiased
                                points.  See glPointSize.

       GL_SMOOTH_POINT_SIZE_GRANULARITY
                                params returns one value, the  granularity  of
                                sizes    for    antialiased    points.     See
                                glPointSize.

       GL_STENCIL_BITS          params returns one value, the number  of  bit-
                                planes 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 sten-
                                cil  test fails. The initial value is GL_KEEP.
                                See glStencilOp.

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

       GL_STENCIL_PASS_DEPTH_FAIL
                                params returns one value, a symbolic  constant
                                indicating what action is taken when the sten-
                                cil test passes, but the depth test fails. The
                                initial value is GL_KEEP.  See glStencilOp.

       GL_STENCIL_PASS_DEPTH_PASS
                                params  returns one value, a symbolic constant
                                indicating what action is taken when the sten-
                                cil test passes and the depth test passes. The
                                initial value is GL_KEEP.  See glStencilOp.

       GL_STENCIL_REF           params returns one value, the reference  value
                                that  is  compared  with  the  contents of the
                                stencil buffer. The initial value is  0.   See
                                glStencilFunc.

       GL_STENCIL_TEST          params returns a single boolean value indicat-
                                ing whether stencil testing  of  fragments  is
                                enabled.  The  initial value is GL_FALSE.  See
                                glStencilFunc and glStencilOp.

       GL_STENCIL_VALUE_MASK    params returns one value,  the  mask  that  is
                                used  to mask both the stencil reference value
                                and the stencil buffer value before  they  are
                                compared.  The  initial value is all 1's.  See
                                glStencilFunc.

       GL_STENCIL_WRITEMASK     params returns one value, the mask  that  con-
                                trols  writing  of  the stencil bitplanes. The
                                initial value is all 1's. See glStencilMask.

       GL_STEREO                params returns a single boolean value indicat-
                                ing  whether  stereo  buffers (left and right)
                                are supported.

       GL_SUBPIXEL_BITS         params returns one value, an estimate  of  the
                                number of bits of subpixel resolution that are
                                used to position rasterized geometry in window
                                coordinates. The initial value
                                is 4.

       GL_TEXTURE_1D            params returns a single boolean value indicat-
                                ing 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 indicat-
                                ing 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 indicat-
                                ing whether 3D texture mapping is enabled. The
                                initial  value is GL_FALSE.  See glTexImage3D.

       GL_TEXTURE_BINDING_3D    params returns a single value, the name of the
                                texture   currently   bound   to   the  target
                                GL_TEXTURE_3D. The initial value  is  0.   See
                                glBindTexture.

       GL_TEXTURE_COORD_ARRAY   params returns a single boolean value indicat-
                                ing whether the texture  coordinate  array  is
                                enabled.  The  initial value is GL_FALSE.  See
                                glTexCoordPointer.

       GL_TEXTURE_COORD_ARRAY_SIZE
                                params returns one value, the number of  coor-
                                dinates  per element in the texture coordinate
                                array.  The   initial   value   is   4.    See
                                glTexCoordPointer.

       GL_TEXTURE_COORD_ARRAY_STRIDE
                                params  returns  one  value,  the  byte offset
                                between consecutive elements  in  the  texture
                                coordinate array. The initial value is 0.  See
                                glTexCoordPointer.

       GL_TEXTURE_COORD_ARRAY_TYPE
                                params returns one value, the data type of the
                                coordinates  in  the texture coordinate array.
                                The   initial   value   is   GL_FLOAT.     See
                                glTexCoordPointer.

       GL_TEXTURE_GEN_Q         params returns a single boolean value indicat-
                                ing whether automatic generation of the q tex-
                                ture  coordinate is enabled. The initial value
                                is GL_FALSE.  See glTexGen.

       GL_TEXTURE_GEN_R         params returns a single boolean value indicat-
                                ing whether automatic generation of the r tex-
                                ture coordinate is enabled. The initial  value
                                is GL_FALSE.  See glTexGen.

       GL_TEXTURE_GEN_S         params returns a single boolean value indicat-
                                ing whether automatic generation of the S tex-
                                ture  coordinate is enabled. The initial value
                                is GL_FALSE.  See glTexGen.

       GL_TEXTURE_GEN_T         params returns a single boolean value indicat-
                                ing whether automatic generation of the T tex-
                                ture 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 matri-
                                ces  on the texture matrix stack.  The initial
                                value is 1.  See glPushMatrix.

       GL_UNPACK_ALIGNMENT      params returns one value, the  byte  alignment
                                used  for  reading pixel data from memory. The
                                initial value is 4.  See glPixelStore.

       GL_UNPACK_IMAGE_HEIGHT   params returns one  value,  the  image  height
                                used  for reading pixel data from memory.  The
                                initial is 0.  See glPixelStore.

       GL_UNPACK_LSB_FIRST      params returns a single boolean value indicat-
                                ing  whether single-bit pixels being read from
                                memory are read first from the least  signifi-
                                cant  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 ini-
                                tial 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 indicat-
                                ing 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 indicat-
                                ing whether the vertex array is  enabled.  The
                                initial     value     is     GL_FALSE.     See
                                glVertexPointer.

       GL_VERTEX_ARRAY_SIZE     params returns one value, the number of  coor-
                                dinates  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  ini-
                                tial  value is GL_FLOAT.  See glVertexPointer.

       GL_VIEWPORT              params returns four values: the x and y window
                                coordinates  of  the viewport, followed by its
                                width and height.  Initially the x and y  win-
                                dow  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_LINE_WIDTH_GRANULARITY  was deprecated in GL version 1.2.  Its func-
       tionality was replaced by GL_SMOOTH_LINE_WIDTH_GRANULARITY.

       GL_LINE_WIDTH_RANGE was deprecated in GL version 1.2.  Its  functional-
       ity was replaced by GL_SMOOTH_LINE_WIDTH_RANGE.

       GL_POINT_SIZE_GRANULARITY  was deprecated in GL version 1.2.  Its func-
       tionality was replaced by GL_SMOOTH_POINT_SIZE_GRANULARITY.

       GL_POINT_SIZE_RANGE was deprecated in GL version 1.2.  Its  functional-
       ity was replaced by GL_SMOOTH_POINT_SIZE_RANGE.

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

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

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

ERRORS

       GL_INVALID_ENUM is generated if pname is not an accepted value.

       GL_INVALID_OPERATION is generated if glGet is executed between the exe-
       cution of glBegin and the corresponding execution of glEnd.

posted on 2010-09-02 16:46 Sosi 阅读(811) 评论(0)  编辑 收藏 引用


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