glNormalPointer(3G)glNormalPointer(3G)NAMEglNormalPointer - define an array of normals
SYNOPSIS
void glNormalPointer(
GLenum type,
GLsizei stride,
const GLvoid *pointer );
PARAMETERS
Specifies the data type of each coordinate in the array. Symbolic con‐
stants GL_BYTE, GL_SHORT, GL_INT, GL_FLOAT, and GL_DOUBLE are accepted.
The initial value is GL_FLOAT. Specifies the byte offset between con‐
secutive normals. If stride is 0- the initial value-the normals are
understood to be tightly packed in the array. The initial value is 0.
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 nor‐
mals 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 effi‐
cient on some implementations; see glInterleavedArrays().) When a nor‐
mal 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 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.
NOTESglNormalPointer() is available only if the GL version is 1.1 or
greater.
The normal array is initially disabled and isn't accessed when glAr‐
rayElement(), 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 glPushClien‐
tAttrib() and glPopClientAttrib() instead.
ERRORS
GL_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(3), glColorPointer(3), glDrawArrays(3), glDrawEle‐
ments(3), glEdgeFlagPointer(3), glEnable(3), glGetPointerv(3), glIndex‐
Pointer(3), glInterleavedArrays(3), glPopClientAttrib(3), glPushClien‐
tAttrib(3), glTexCoordPointer(3), glVertexPointer(3)glNormalPointer(3G)