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 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
