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glNormalPointer - define an array of normals
void
glNormalPointer( GLenum type,
GLsizei stride,
const GLvoid *ptr )
eqn not supported
- 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.
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.
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.
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(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)
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