NAME
glNormalPointer
- define an array of normals
C SPECIFICATION
void ggllNNoorrmmaallPPooiinntteerr(
GLenum _t_y_p_e,
GLsizei _s_t_r_i_d_e,
const GLvoid _*_p_t_r )
delim $$
PARAMETERS
-
_t_y_p_e
-
Specifies the data type of each coordinate in the array.
Symbolic constants
GGLL__BBYYTTEE,
GGLL__SSHHOORRTT,
GGLL__IINNTT,
GGLL__FFLLOOAATT, and
GGLL__DDOOUUBBLLEE
are accepted. The initial value is GGLL__FFLLOOAATT.
-
_s_t_r_i_d_e
-
Specifies the byte offset between consecutive normals. If _s_t_r_i_d_e is 0-
the initial value-the normals are understood to be tightly packed in
the array.
The initial value is 0.
-
_p_t_r
-
Specifies a pointer to the first coordinate of the first normal in the
array.
The initial value is 0.
DESCRIPTION
ggllNNoorrmmaallPPooiinntteerr specifies the location and data of an array of normals
to use when rendering.
_t_y_p_e specifies the data type of
the normal coordinates and _s_t_r_i_d_e 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 ggllIInntteerrlleeaavveeddAArrrraayyss.)
When a normal array is specified, _t_y_p_e, _s_t_r_i_d_e, and _p_t_r are
saved as client-side state.
To enable and disable the normal array, call ggllEEnnaabblleeCClliieennttSSttaattee and
ggllDDiissaabblleeCClliieennttSSttaattee with the argument GGLL__NNOORRMMAALL__AARRRRAAYY. If
enabled, the normal array is used
when ggllDDrraawwAArrrraayyss, ggllDDrraawwEElleemmeennttss, or ggllAArrrraayyEElleemmeenntt is called.
Use ggllDDrraawwAArrrraayyss to construct a sequence of primitives (all of the
same type) from prespecified vertex and vertex attribute arrays.
Use ggllAArrrraayyEElleemmeenntt to specify primitives
by indexing vertices and vertex attributes and ggllDDrraawwEElleemmeennttss to
construct a sequence of primitives by indexing vertices and vertex attributes.
NOTES
ggllNNoorrmmaallPPooiinntteerr is available only if the GL version is 1.1 or greater.
The normal array is initially disabled and isn't accessed when
ggllAArrrraayyEElleemmeenntt, ggllDDrraawwEElleemmeennttss, or ggllDDrraawwAArrrraayyss is called.
Execution of ggllNNoorrmmaallPPooiinntteerr is not allowed between
ggllBBeeggiinn and the corresponding ggllEEnndd,
but an error may or may not be generated. If an error is not generated,
the operation is undefined.
ggllNNoorrmmaallPPooiinntteerr is typically implemented on the client side.
Since the normal array parameters are client-side state, they are not
saved or restored by ggllPPuusshhAAttttrriibb and ggllPPooppAAttttrriibb.
Use ggllPPuusshhCClliieennttAAttttrriibb and
ggllPPooppCClliieennttAAttttrriibb instead.
ERRORS
GGLL__IINNVVAALLIIDD__EENNUUMM is generated if _t_y_p_e is not an accepted value.
GGLL__IINNVVAALLIIDD__VVAALLUUEE is generated if _s_t_r_i_d_e is negative.
ASSOCIATED GETS
ggllIIssEEnnaabblleedd with argument GGLL__NNOORRMMAALL__AARRRRAAYY
ggllGGeett with argument GGLL__NNOORRMMAALL__AARRRRAAYY__TTYYPPEE
ggllGGeett with argument GGLL__NNOORRMMAALL__AARRRRAAYY__SSTTRRIIDDEE
ggllGGeettPPooiinntteerrvv with argument GGLL__NNOORRMMAALL__AARRRRAAYY__PPOOIINNTTEERR
SEE ALSO
ggllAArrrraayyEElleemmeenntt((33GG)),
ggllCCoolloorrPPooiinntteerr((33GG)),
ggllDDrraawwAArrrraayyss((33GG)),
ggllDDrraawwEElleemmeennttss((33GG)),
ggllEEddggeeFFllaaggPPooiinntteerr((33GG)),
ggllEEnnaabbllee((33GG)),
ggllGGeettPPooiinntteerrvv((33GG)),
ggllIInnddeexxPPooiinntteerr((33GG)),
ggllIInntteerrlleeaavveeddAArrrraayyss((33GG)),
ggllPPooppCClliieennttAAttttrriibb((33GG)),
ggllPPuusshhCClliieennttAAttttrriibb((33GG)),
ggllTTeexxCCoooorrddPPooiinntteerr((33GG)),
ggllVVeerrtteexxPPooiinntteerr((33GG))