/// <summary>
/// Sets the dial and button box button callback for the current window.
/// </summary>
/// <param name="func">
/// The new button box callback function. See <see cref="ButtonBoxCallback" />.
/// </param>
/// <remarks>
/// <para>
/// <b>glutButtonBoxFunc</b> sets the dial and button box button callback for the
/// current window. The dial and button box button callback for a window is
/// called when the window has dial and button box input focus (normally, when the
/// mouse is in the window) and the user generates dial and button box button
/// presses. The <i>button</i> parameter will be the button number (starting at
/// one). The number of available dial and button box buttons can be determined
/// with <c>Glut.glutDeviceGet(Glut.GLUT_NUM_BUTTON_BOX_BUTTONS)</c>. The
/// <i>state</i> is either <see cref="GLUT_UP" /> or <see cref="GLUT_DOWN" />
/// indicating whether the callback was due to a release or press respectively.
/// </para>
/// <para>
/// Registering a dial and button box button callback when a dial and button box
/// device is not available is ineffectual and not an error. In this case, no
/// dial and button box button callbacks will be generated.
/// </para>
/// <para>
/// Passing <c>null</c> to <b>glutButtonBoxFunc</b> disables the generation of
/// dial and button box button callbacks. When a new window is created, no dial
/// and button box button callback is initially registered.
/// </para>
/// </remarks>
/// <seealso cref="ButtonBoxCallback" />
/// <seealso cref="glutDeviceGet" />
// GLUTAPI void APIENTRY glutButtonBoxFunc(void (GLUTCALLBACK *func)(int button, int state));
public static void glutButtonBoxFunc([In] ButtonBoxCallback func) {
buttonBoxCallback = func;
__glutButtonBoxFunc(buttonBoxCallback);
}
private static extern void __glutButtonBoxFunc(ButtonBoxCallback func);
