glNormalPointer (original) (raw)

Name

glNormalPointer — define an array of normals

C Specification

void glNormalPointer(	GLenum type,
	GLsizei stride,
	const void * pointer);

Parameters

type

Specifies the data type of each coordinate in the array. Symbolic constantsGL_BYTE,GL_SHORT,GL_INT,GL_FLOAT, andGL_DOUBLE are accepted. The initial value is GL_FLOAT.

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.

Description

glNormalPointer specifies the location and data format of an array of normals to use when rendering.type specifies the data type of each normal coordinate, and stride specifies 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.)

If a non-zero named buffer object is bound to the GL_ARRAY_BUFFER target (see glBindBuffer) while a normal array is specified, pointer is treated as a byte offset into the buffer object's data store. Also, the buffer object binding (GL_ARRAY_BUFFER_BINDING) is saved as normal vertex array client-side state (GL_NORMAL_ARRAY_BUFFER_BINDING).

When a normal array is specified,type, stride, and pointer are saved as client-side state, in addition to the current vertex array buffer object binding.

To enable and disable the normal array, callglEnableClientState and glDisableClientState with the argumentGL_NORMAL_ARRAY. If enabled, the normal array is used when glDrawArrays, glMultiDrawArrays, glDrawElements,glMultiDrawElements, glDrawRangeElements, orglArrayElement is called.

Errors

GL_INVALID_ENUM is generated if type is not an accepted value.

GL_INVALID_VALUE is generated if stride is negative.

Associated Gets

glIsEnabled with argument GL_NORMAL_ARRAY

glGet with argument GL_NORMAL_ARRAY_TYPE

glGet with argument GL_NORMAL_ARRAY_STRIDE

glGet with argument GL_NORMAL_ARRAY_BUFFER_BINDING

glGet with argument GL_ARRAY_BUFFER_BINDING

glGetPointerv with argument GL_NORMAL_ARRAY_POINTER