// NormalSlice uses glNormalPointer to bind an element of the currently
// bound buffer at the given index. See VertexAttribSlice for more details.
//
// Precondition: VBO bound to ARRAY_BUFFER target containing data of array type dummy
func NormalSlice(dummy interface{}, dummy_index int) error {
data, err := sliceAttrib(dummy, dummy_index)
if err != nil {
return err
}
if data.Elements != 3 {
return fmt.Errorf("gla: invalid number of elements")
}
C.glNormalPointer(C.GLenum(data.Gltype), C.GLsizei(data.Stride), unsafe.Pointer(data.Offset))
return nil
}
//void glNormalPointer (GLenum type, int stride, const GLvoid *pointer)
func NormalPointer(typ GLenum, stride int, pointer interface{}) {
C.glNormalPointer(C.GLenum(typ), C.GLsizei(stride), ptr(pointer))
}