private void BeforeDraw()
{
m_bNoDrawChildren = false;
if (m_childClippingMode == CCClipMode.Bounds)
{
// We always clip to the bounding box
var rect = new CCRect(0, 0, m_obContentSize.Width, m_obContentSize.Height);
var bounds = CCAffineTransform.Transform(rect, NodeToWorldTransform());
var winSize = CCDirector.SharedDirector.WinSize;
CCRect prevScissorRect;
if (CCDrawManager.ScissorRectEnabled)
{
prevScissorRect = CCDrawManager.ScissorRect;
}
else
{
prevScissorRect = new CCRect(0, 0, winSize.Width, winSize.Height);
}
if (!bounds.IntersectsRect(prevScissorRect))
{
m_bNoDrawChildren = true;
return;
}
float minX = Math.Max(bounds.MinX, prevScissorRect.MinX);
float minY = Math.Max(bounds.MinY, prevScissorRect.MinY);
float maxX = Math.Min(bounds.MaxX, prevScissorRect.MaxX);
float maxY = Math.Min(bounds.MaxY, prevScissorRect.MaxY);
if (CCDrawManager.ScissorRectEnabled)
{
m_bRestoreScissor = true;
}
else
{
CCDrawManager.ScissorRectEnabled = true;
}
m_tSaveScissorRect = prevScissorRect;
CCDrawManager.SetScissorInPoints(minX, minY, maxX - minX, maxY - minY);
}
else if (m_childClippingMode == CCClipMode.BoundsWithRenderTarget)
{
m_tSaveScissorRect = CCDrawManager.ScissorRect;
m_bRestoreScissor = CCDrawManager.ScissorRectEnabled;
CCDrawManager.ScissorRectEnabled = false;
CCDrawManager.PushMatrix();
CCDrawManager.SetIdentityMatrix();
m_pRenderTexture.BeginWithClear(0, 0, 0, 0);
}
}
public override void Visit()
{
if (m_pStencil == null || !m_pStencil.Visible)
{
if (m_bInverted)
{
// draw everything
base.Visit();
}
return;
}
if (_layer + 1 == 8) //DepthFormat.Depth24Stencil8
{
if (_once)
{
CCLog.Log(
"Nesting more than 8 stencils is not supported. Everything will be drawn without stencil for this node and its childs."
);
_once = false;
}
base.Visit();
return;
}
_layer++;
int maskLayer = 1 << _layer;
int maskLayerL = maskLayer - 1;
int maskLayerLe = maskLayer | maskLayerL;
var saveDepthStencilState = CCDrawManager.DepthStencilState;
///////////////////////////////////
// CLEAR STENCIL BUFFER
var stencilState = new DepthStencilState()
{
DepthBufferEnable = false,
StencilEnable = true,
StencilFunction = CompareFunction.Never,
StencilMask = maskLayer,
StencilWriteMask = maskLayer,
ReferenceStencil = maskLayer,
StencilFail = !m_bInverted ? StencilOperation.Zero : StencilOperation.Replace
};
CCDrawManager.DepthStencilState = stencilState;
// draw a fullscreen solid rectangle to clear the stencil buffer
var size = CCDirector.SharedDirector.WinSize;
CCDrawManager.PushMatrix();
CCDrawManager.SetIdentityMatrix();
CCDrawingPrimitives.Begin();
CCDrawingPrimitives.DrawSolidRect(CCPoint.Zero, new CCPoint(size.Width, size.Height), new CCColor4B(255, 255, 255, 255));
CCDrawingPrimitives.End();
CCDrawManager.PopMatrix();
///////////////////////////////////
// DRAW CLIPPING STENCIL
stencilState = new DepthStencilState()
{
DepthBufferEnable = false,
StencilEnable = true,
StencilFunction = CompareFunction.Never,
StencilMask = maskLayer,
StencilWriteMask = maskLayer,
ReferenceStencil = maskLayer,
StencilFail = !m_bInverted ? StencilOperation.Replace : StencilOperation.Zero,
};
CCDrawManager.DepthStencilState = stencilState;
if (m_fAlphaThreshold < 1)
{
if (_alphaTest == null)
{
_alphaTest = new AlphaTestEffect(CCDrawManager.GraphicsDevice);
_alphaTest.AlphaFunction = CompareFunction.Greater;
}
_alphaTest.ReferenceAlpha = (byte)(255 * m_fAlphaThreshold);
CCDrawManager.PushEffect(_alphaTest);
}
CCDrawManager.PushMatrix();
Transform();
m_pStencil.Visit();
CCDrawManager.PopMatrix();
if (m_fAlphaThreshold < 1)
{
CCDrawManager.PopEffect();
}
///////////////////////////////////
// DRAW CONTENT
stencilState = new DepthStencilState()
{
DepthBufferEnable = saveDepthStencilState.DepthBufferEnable,
StencilEnable = true,
StencilMask = maskLayerLe,
StencilWriteMask = 0,
ReferenceStencil = maskLayerLe,
StencilFunction = CompareFunction.Equal,
StencilPass = StencilOperation.Keep,
StencilFail = StencilOperation.Keep,
};
CCDrawManager.DepthStencilState = stencilState;
base.Visit();
//Restore DepthStencilState
CCDrawManager.DepthStencilState = saveDepthStencilState;
_layer--;
}
