PFNGLGETTEXTUREIMAGEEXTPROC typedef
        PFNGLGETTEXTUREIMAGEEXTPROC =
     Void Function(Uint32 texture, Uint32 target, Int32 level, Uint32 format, Uint32 type, Pointer<NativeType>  pixels)
    
    
    
Implementation
typedef PFNGLGETTEXTUREIMAGEEXTPROC =
    Void Function(
      Uint32 texture,
      Uint32 target,
      Int32 level,
      Uint32 format,
      Uint32 type,
      Pointer<NativeType> pixels,
    );