void GLAPIENTRY glGetTexGendv( GLenum coord,
                                      GLenum pname,
                                      GLdouble *params )
       void GLAPIENTRY glGetTexGenfv( GLenum coord,
                                      GLenum pname,
                                      GLfloat *params )
       void GLAPIENTRY glGetTexGeniv( GLenum coord,
                                      GLenum pname,
                                      GLint *params )

PARAMETERS
       coord   Specifies a texture coordinate.  Must be GL_S,  GL_T,  GL_R,  or
               GL_Q.

       pname   Specifies  the  symbolic  name  of  the value(s) to be returned.
               Must be either GL_TEXTURE_GEN_MODE or the name  of  one  of  the
               texture   generation   plane   equations:   GL_OBJECT_PLANE   or
               GL_EYE_PLANE.

       params  Returns the requested data.

DESCRIPTION
       glGetTexGen returns in params selected parameters of a  texture  coordi‐
       nate generation function that was specified using glTexGen.  coord names
       one of the (s, t, r, q) texture coordinates, using the symbolic constant
       GL_S, GL_T, GL_R, or GL_Q.

       pname specifies one of three symbolic names:

       GL_TEXTURE_GEN_MODE         params  returns  the  single-valued  texture
                                   generation function,  a  symbolic  constant.
                                   The initial value is GL_EYE_LINEAR.

       GL_OBJECT_PLANE             params returns the four plane equation coef‐
                                   ficients that specify object  linear-coordi‐
                                   nate  generation.   Integer values, when re‐
                                   quested, are mapped directly from the inter‐
                                   nal floating-point representation.

       GL_EYE_PLANE                params returns the four plane equation coef‐
                                   ficients that specify eye  linear-coordinate
                                   generation.  Integer values, when requested,
                                   are mapped directly from the internal float‐
                                   ing-point representation.  The returned val‐
                                   ues are those maintained in eye coordinates.
                                   They  are  not equal to the values specified
                                   using glTexGen, unless the modelview  matrix
                                   was identity when glTexGen was called.

NOTES
       If an error is generated, no change is made to the contents of params.