redhat man page for glnormalpointer

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.  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 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 efficient on some implementations; see glInterleavedArrays.)  When a nor-
       mal 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)