HP Workstation c3650 OpenGL 1.1 Reference for HP-UX 11.x - Page 302

N glNormalPointer glNormalPointer glNormalPointer: define an array of normals. C Specification void glNormalPointer( GLenum type, GLsizei stride, const GLvoid *pointer) Parameters type stride pointer 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. 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 array. Description 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. 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 pre-specified 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. 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. 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. 302 Chapter 12