glNormalPointer
- define an array of normals
void glNormalPointer(GLenum type, GLsizei stride, const GLvoid * pointer)
type
Specifies the data type of each coordinate in the array. Symbolic constants GL_BYTE
, GL_SHORT
, and GL_FIXED
are accepted. However, the initial value is GL_FLOAT
.
The common profile accepts the symbolic constant GL_FLOAT
as well.
stride
Specifies the byte offset between consecutive normals. If stride
is 0, the normals are understood to be tightly packed in the array. The initial value is 0.
pointer
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.) When a normal array is specified, type
, stride
, and pointer
are saved as client-side state.
If the normal array is enabled, it is used when glDrawArrays
or glDrawElements
is called. To enable and disable the normal array, call glEnableClientState
and glDisableClientState
with the argument GL_NORMAL_ARRAY
. The normal array is initially disabled and isn't accessed when glDrawArrays
or glDrawElements
is called.
Use glDrawArrays
to construct a sequence of primitives (all of the same type) from prespecified vertex and vertex attribute arrays. Use glDrawElements
to construct a sequence of primitives by indexing vertices and vertex attributes.
glNormalPointer
is typically implemented on the client side.
GL_INVALID_ENUM
is generated if type
is not an accepted value.
GL_INVALID_VALUE
is generated if stride
is negative.
Copyright © 2003-2004 Silicon Graphics, Inc.
This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.
glColorPointer
, glDrawArrays
, glDrawElements
, glEnable
, glTexCoordPointer
, glVertexPointer