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GLNORMALPOINTER(3G)					   GLNORMALPOINTER(3G)

NAME
       glNormalPointer - define an array of normals

C SPECIFICATION
       void glNormalPointer( GLenum type,
			     GLsizei stride,
			     const GLvoid *ptr )

PARAMETERS
       type    Specifies  the data type of each coordinate in the array.  Sym‐
	       bolic  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 array.  The initial value is 0.

       ptr     Specifies a pointer to the first coordinate of the first normal
	       in the array.  The initial value is 0.

DESCRIPTION
       glNormalPointer specifies the location and data	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 vertices and attributes to be packed into a single array
       or stored in separate arrays.  (Single-array storage may be more	 effi‐
       cient on some implementations; see glInterleavedArrays.)	 When a normal
       array is specified, type, stride, and  ptr  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 called.

       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	 vertices  and	vertex
       attributes  and glDrawElements to construct a sequence of primitives by
       indexing vertices and vertex attributes.

NOTES
       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 called.

       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 undefined.

       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 instead.

ERRORS
       GL_INVALID_ENUM is generated if type is not an accepted value.

       GL_INVALID_VALUE is generated if stride is negative.

ASSOCIATED GETS
       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

SEE ALSO
       glArrayElement(3G),	  glColorPointer(3G),	     glDrawArrays(3G),
       glDrawElements(3G),	  glEdgeFlagPointer(3G),	 glEnable(3G),
       glGetPointerv(3G),     glIndexPointer(3G),     glInterleavedArrays(3G),
       glPopClientAttrib(3G),  glPushClientAttrib(3G),	glTexCoordPointer(3G),
       glVertexPointer(3G)

							   GLNORMALPOINTER(3G)
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