GLNORMALPOINTER - Online Linux Manual PageSection : 3G
NAME"glNormalPointer − define an array of normals
C SPECIFICATIONvoid glNormalPointer( GLenum type, GLsizei stride, const GLvoid *ptr )
PARAMETERStype  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.
DESCRIPTION­glNormalPointer 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.
NOTES­glNormalPointer 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.
ERRORS­GL_INVALID_ENUM is generated if type is not an accepted value. ­GL_INVALID_VALUE is generated if stride is negative.
ASSOCIATED GETS­glIsEnabled 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 ALSO­glArrayElement(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) 0
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