glNormalPointer - define an array of normals

	  void glNormalPointer(	GLenum type,
				GLsizei	stride,
				const GLvoid *pointer )

	  type	   Specifies the data type of each coordinate in the
		   array. Symbolic constants GL_BYTE, GL_SHORT,
		   GL_INT, GL_FLOAT, and GL_DOUBLE are accepted. The
		   initial value is GL_FLOAT.

	  stride   Specifies the byte offset between consecutive
		   normals. If stride is 0- the	initial	value-the
		   normals are understood to be	tightly	packed in the

	  pointer  Specifies a pointer to the first coordinate of the
		   first normal	in the array.

	  glNormalPointer specifies the	location and data format of an
	  array	of normals to use when rendering.  type	specifies the
	  data type of the normal coordinates and stride gives the
	  byte stride from one normal to the next, allowing vertexes
	  and attributes to be packed into a single array or stored in
	  separate arrays.  (Single-array storage may be more
	  efficient on some implementations; see glInterleavedArrays.)
	  When a normal	array is specified, type, stride, and pointer
	  are saved as client-side state.

	  To enable and	disable	the normal array, call
	  glEnableClientState and glDisableClientState with the
	  argument GL_NORMAL_ARRAY. If enabled,	the normal array is
	  used when glDrawArrays, glDrawElements, or glArrayElement is

	  Use glDrawArrays to construct	a sequence of primitives (all
	  of the same type) from prespecified vertex and vertex
	  attribute arrays.  Use glArrayElement	to specify primitives
	  by indexing vertexes and vertex attributes and
	  glDrawElements to construct a	sequence of primitives by
	  indexing vertexes and	vertex attributes.

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

	  The normal array is initially	disabled and isn't accessed
	  when glArrayElement, glDrawElements, or glDrawArrays is

	  Execution of glNormalPointer is not allowed between glBegin
	  and the corresponding	glEnd, but an error may	or may not be
	  generated. If	an error is not	generated, the operation is

	  glNormalPointer is typically implemented on the client side.

	  Since	the normal array parameters are	client-side state,
	  they are not saved or	restored by glPushAttrib and
	  glPopAttrib.	Use glPushClientAttrib and glPopClientAttrib

	  GL_INVALID_ENUM is generated if type is not an accepted

	  GL_INVALID_VALUE is generated	if stride is negative.

	  glIsEnabled with argument GL_NORMAL_ARRAY
	  glGet	with argument GL_NORMAL_ARRAY_TYPE
	  glGet	with argument GL_NORMAL_ARRAY_STRIDE
	  glGetPointerv	with argument GL_NORMAL_ARRAY_POINTER

	  glArrayElement, glColorPointer, glDrawArrays,
	  glDrawElements, glEdgeFlagPointer, glEnable, glGetPointerv,
	  glIndexPointer, glInterleavedArrays, glPopClientAttrib,
	  glPushClientAttrib, glTexCoordPointer, glVertexPointer