private void Awake()
{
stencilBlock = new MaterialPropertyBlock();
callback = window.gameObject.AddComponent <VisibilityCallback>();
callback.target = this;
}
/// <summary>
/// Sets the visibility callback for the current window.
/// </summary>
/// <param name="func">
/// The new visibility callback function. See <see cref="VisibilityCallback" />.
/// </param>
/// <remarks>
/// <para>
/// <b>glutVisibilityFunc</b> sets the visibility callback for the current window.
/// The visibility callback for a window is called when the visibility of a
/// window changes. The state callback parameter is either
/// <see cref="GLUT_NOT_VISIBLE" /> or <see cref="GLUT_VISIBLE" /> depending on
/// the current visibility of the window. <i>GLUT_VISIBLE</i> does not
/// distinguish a window being totally versus partially visible.
/// <i>GLUT_NOT_VISIBLE</i> means no part of the window is visible, i.e., until
/// the window's visibility changes, all further rendering to the window is
/// discarded.
/// </para>
/// <para>
/// GLUT considers a window visible if any pixel of the window is visible or any
/// pixel of any descendant window is visible on the screen.
/// </para>
/// <para>
/// Passing <c>null</c> to <b>glutVisibilityFunc</b> disables the generation of
/// the visibility callback.
/// </para>
/// <para>
/// If the visibility callback for a window is disabled and later re-enabled, the
/// visibility status of the window is undefined; any change in window visibility
/// will be reported, that is if you disable a visibility callback and re-enable
/// the callback, you are guaranteed the next visibility change will be reported.
/// </para>
/// </remarks>
/// <seealso cref="VisibilityCallback" />
// GLUTAPI void APIENTRY glutVisibilityFunc(void (GLUTCALLBACK *func)(int state));
public static void glutVisibilityFunc([In] VisibilityCallback func) {
visibilityCallback = func;
__glutVisibilityFunc(visibilityCallback);
}
private static extern void __glutVisibilityFunc(VisibilityCallback func);