glNormalPointer: define an array of normals.
C Specification |
Associated Gets |
const GLvoid *pointer)
glNormalPointer specifies the location and data format 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 vertexes 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
pointer are saved as client-side state.
- 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
- 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.
- Specifies a pointer to the first coordinate of the first normal in the
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 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.
glIsEnabled with argument
- GL_INVALID_ENUM is generated if type is
not an accepted value.
- GL_INVALID_VALUE is generated if stride
glGet with argument
glGet with argument
glGetPointerv with argument