glGetPointerv - return the address of the specified pointer

void glGetPointerv( GLenum pname,
                    GLvoid* *params )

pname          Specifies the array or buffer pointer to be
        returned.  Symbolic constants
        GL_COLOR_ARRAY_POINTER, GL_EDGE_FLAG_ARRAY_POINTER,
        GL_FEEDBACK_BUFFER_POINTER, GL_INDEX_ARRAY_POINTER,
        GL_NORMAL_ARRAY_POINTER,
        GL_TEXTURE_COORD_ARRAY_POINTER,
        GL_SELECTION_BUFFER_POINTER, and
        GL_VERTEX_ARRAY_POINTER are accepted.

params  Returns the pointer value specified by pname.

glGetPointerv returns pointer information. pname is a
symbolic constant indicating the pointer to be returned, and
params is a pointer to a location in which to        place the
returned data.

glGetPointerv is available only if the GL version is 1.1 or
greater.

The pointers are all client-side state.

The initial value for each pointer is 0.

GL_INVALID_ENUM is generated if pname        is not an accepted
value.