glNormalPointer man page on DigitalUNIX

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glNormalPointer(3G)					   glNormalPointer(3G)

       glNormalPointer - define an array of normals

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

       Specifies  the data type of each coordinate in the array. Symbolic con‐
       stants GL_BYTE, GL_SHORT, GL_INT, GL_FLOAT, and GL_DOUBLE are accepted.
       The  initial value is GL_FLOAT.	Specifies the byte offset between con‐
       secutive normals. If stride is 0- the  initial  value-the  normals  are
       understood  to  be tightly packed in the array. The initial value is 0.
       Specifies a pointer to the first coordinate of the first normal in  the
       array. The initial value is 0.

       glNormalPointer()  specifies  the location and data of an array of nor‐
       mals 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 effi‐
       cient on some implementations; see glInterleavedArrays().) When a  nor‐
       mal  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 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 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

       The normal array is initially disabled and isn't	 accessed  when	 glAr‐
       rayElement(), 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 glPushClien‐
       tAttrib() and glPopClientAttrib() instead.

       GL_INVALID_ENUM is generated if type is not an accepted value.

       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(3),   glColorPointer(3),	 glDrawArrays(3),   glDrawEle‐
       ments(3), glEdgeFlagPointer(3), glEnable(3), glGetPointerv(3), glIndex‐
       Pointer(3),  glInterleavedArrays(3), glPopClientAttrib(3), glPushClien‐
       tAttrib(3), glTexCoordPointer(3), glVertexPointer(3)


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