glGetTexGendv, glGetTexGenfv,	glGetTexGeniv -	return texture
coordinate generation	parameters

glGetTexGendv
	glGetTexGendv(coord, pname) -> params
glGetTexGenfv
	glGetTexGenfv(coord, pname) -> params
glGetTexGeniv
	glGetTexGeniv(coord, pname) -> params

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

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.

glGetTexGen returns in params	selected parameters of a
texture coordinate 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 coefficients that
                            specify object linear-coordinate
                            generation.  Integer values,
                            when requested, are mapped
                            directly from the	internal
                            floating-point representation.

GL_EYE_PLANE		      params returns the four plane
                            equation coefficients that
                            specify eye linear-coordinate
                            generation.  Integer values,
                            when requested, are mapped
                            directly from the	internal
                            floating-point representation.
                            The returned values 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.

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

GL_INVALID_ENUM is generated if coord	or pname is not	an
accepted value.

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

glTexGen