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Manual Reference Pages  - GLNORMALPOINTER (3G)

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glNormalPointer - define an array of normals

CONTENTS

C Specification
Parameters
Description
Notes
Errors
Associated Gets
See Also

void glNormalPointer( GLenum type,

                    GLsizei stride,
                    const GLvoid *ptr )

type	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.

 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; 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.

 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.

 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.

 GL_INVALID_ENUM is generated if type is not an accepted value.

 GL_INVALID_VALUE is generated if stride is negative.

 glIsEnabled 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

 glArrayElement(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)

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