- define an array of normals
C SPECIFICATION
PARAMETERS
_param1 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.
_param2 Specifies the byte offset between consecutive
normals. If _param2 is 0- the initial value-the
normals are understood to be tightly packed in
the array. The initial value is 0.
_param3 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. _param1 specifies
the data type of the normal coordinates and _param2 gives
the byte stride from one normal to the next, allowing ver-
texes 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,
_param1, _param2, and _param3 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 primi-
tives by indexing vertexes and vertex attributes and
glDrawElements to construct a sequence of primitives by
indexing vertexes 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.
GL_INVALID_ENUM is generated if _param1 is not an accepted
value.
GL_INVALID_VALUE is generated if _param2 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, glColorPointer, glDrawArrays,
glDrawElements, glEdgeFlagPointer, glEnable,
glGetPointerv, glIndexPointer, glInterleavedArrays,
glPopClientAttrib, glPushClientAttrib, glTexCoordPointer,
glVertexPointer
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