/// <summary>
/// Pushes an effect on the stack that will cause all rendering not the specified region defined by a rectangle to be
/// ignored. The rectangle is in the current coordinate space of the context.
/// </summary>
public void PushClip(Rectangle Clip)
{
if (this._TopTranslate != null)
{
Clip.Location += this._TopTranslate.Offset;
}
if (this._TopClip == null)
{
GL.Enable(EnableCap.ScissorTest);
}
else
{
Clip = Rectangle.Intersection(Clip, this._TopClip.Rectangle);
}
_ClipEffect ce = new _ClipEffect()
{
Previous = this._TopClip,
Rectangle = Clip
};
ce.Apply(this._ViewSize.Y);
this._Effects.Push(this._TopClip = ce);
}
/// <summary>
/// Undoes the most recent command/effect given to the context.
/// </summary>
public void Pop()
{
_Effect e = this._Effects.Pop();
// Remove clip effect
_ClipEffect ce = e as _ClipEffect;
if (ce != null)
{
this._TopClip = ce.Previous;
if (this._TopClip == null)
{
GL.Disable(EnableCap.ScissorTest);
}
else
{
this._TopClip.Apply(this._ViewSize.Y);
}
}
// Remove translate effect
_TranslateEffect te = e as _TranslateEffect;
if (te != null)
{
this._TopTranslate = te.Previous;
if (this._TopTranslate != null)
{
Point noffset = this._TopTranslate.Offset - te.Offset;
GL.Translate(noffset.X, noffset.Y, 0.0);
}
else
{
GL.Translate(-te.Offset.X, -te.Offset.Y, 0.0);
}
}
}
