protected override void OnEnable()
{
base.OnEnable();
m_ShouldRecalculateClipRects = true;
ClipperRegistry.Register(this);
MaskUtilities.Notify2DMaskStateChanged(this);
}
protected override void OnDisable()
{
base.OnDisable();
m_MaskableTargets.Clear();
m_Clippers.Clear();
ClipperRegistry.UnRegister(this);
MaskUtilities.Notify2DMaskStateChanged(this);
}
public Material GetModifiedMaterial(Material baseMaterial)
{
if (!MaskEnabled())
{
return(baseMaterial);
}
var rootSortCanvas = MaskUtilities.FindRootSortOverriedCanvas(transform);
var stencilDepth = MaskUtilities.GetStencilDepth(transform, rootSortCanvas);
if (stencilDepth > 8)
{
Debug.LogWarning("Mask 层级不能超过8层，在同一个canvas下");
return(baseMaterial);
}
int desiredStencilBit = 1 << stencilDepth;
// 第一个Mask
if (desiredStencilBit == 0)
{
// 重新创建一个裁剪材质
var maskMaterial = StencilMaterial.Add(baseMaterial, 1, StencilOp.Replace, CompareFunction.Always, m_ShowMaskGraphic ? ColorWriteMask.All : 0);
StencilMaterial.Remove(m_MaskMaterial);
m_MaskMaterial = maskMaterial;
// 重新创建一个清理模板值得材质
var unmaskMaterial = StencilMaterial.Add(baseMaterial, 1, StencilOp.Zero, CompareFunction.Always, 0);
StencilMaterial.Remove(m_UnmaskMaterial);
m_UnmaskMaterial = unmaskMaterial;
// TODO WG 不清楚具体现实逻辑
graphic.canvasRenderer.popMaterialCount = 1;
graphic.canvasRenderer.SetPopMaterial(m_UnmaskMaterial, 0);
return(m_MaskMaterial);
}
// 不是第一个Mask
var maskMaterial2 = StencilMaterial.Add(baseMaterial, desiredStencilBit | (desiredStencilBit - 1), StencilOp.Replace, CompareFunction.Equal, m_ShowMaskGraphic ? ColorWriteMask.All : 0, desiredStencilBit - 1, desiredStencilBit | (desiredStencilBit - 1));
StencilMaterial.Remove(m_MaskMaterial);
m_MaskMaterial = maskMaterial2;
// TODO WG 不清楚具体现实逻辑
graphic.canvasRenderer.hasPopInstruction = true;
var unmaskMaterial2 = StencilMaterial.Add(baseMaterial, desiredStencilBit - 1, StencilOp.Replace, CompareFunction.Equal, 0, desiredStencilBit - 1, desiredStencilBit | (desiredStencilBit - 1));
StencilMaterial.Remove(m_UnmaskMaterial);
m_UnmaskMaterial = unmaskMaterial2;
graphic.canvasRenderer.popMaterialCount = 1;
graphic.canvasRenderer.SetPopMaterial(m_UnmaskMaterial, 0);
return(m_MaskMaterial);
}
protected override void OnValidate()
{
base.OnValidate();
m_ShouldRecalculateClipRects = true;
if (!IsActive())
{
return;
}
MaskUtilities.Notify2DMaskStateChanged(this);
}
protected override void OnEnable()
{
base.OnEnable();
m_ShouldRecalculateStencil = true;
UpdateClipParent();
SetMaterialDirty();
if (GetComponent <Mask>() != null)
{
MaskUtilities.NotifyStencilStateChanged(this);
}
}
/// <summary>
/// Update中计算
/// </summary>
// TODO 简单实现
public void PerformClipping()
{
if (ReferenceEquals(Canvas, null))
{
return;
}
if (m_ShouldRecalculateClipRects)
{
MaskUtilities.GetRectMasksForClip(this, m_Clippers);
m_ShouldRecalculateClipRects = false;
}
bool validRect = true;
// 相交区域
Rect clipRect = Clipping.FindCullAndClipWorldRect(m_Clippers, out validRect);
RenderMode renderMode = Canvas.rootCanvas.renderMode;
// 已经被裁剪
bool maskIsCulled = (renderMode == RenderMode.ScreenSpaceCamera || renderMode == RenderMode.ScreenSpaceOverlay) && !clipRect.Overlaps(rootCanvasRect);
if (maskIsCulled)
{
clipRect = Rect.zero;
validRect = false;
}
if (clipRect != m_LastClipRectCanvasSpace)
{
foreach (var maskTarget in m_MaskableTargets)
{
maskTarget.SetClipRect(clipRect, validRect);
maskTarget.Cull(clipRect, validRect);
}
}
else if (m_ForceClip)
{
foreach (var maskTarget in m_MaskableTargets)
{
maskTarget.SetClipRect(clipRect, validRect);
if (maskTarget.canvasRenderer.hasMoved)
{
maskTarget.Cull(clipRect, validRect);
}
}
}
m_LastClipRectCanvasSpace = clipRect;
m_ForceClip = false;
}
protected override void OnEnable()
{
base.OnEnable();
if (graphic != null)
{
graphic.canvasRenderer.hasPopInstruction = true;
// WG 这里会导致材质的创建
graphic.SetMaterialDirty();
}
// WG 启用裁剪之后这个节点下面的字元素都需要重新计算材质的模板值
// 由于所有的UI元素都继承与MaskableGraphic，所以这个重新计算写在里面
MaskUtilities.NotifyStencilStateChanged(this);
}
protected override void OnValidate()
{
base.OnValidate();
if (!IsActive())
{
return;
}
if (graphic != null)
{
graphic.SetMaterialDirty();
}
MaskUtilities.NotifyStencilStateChanged(this);
}
private void UpdateClipParent()
{
var newParent = (maskable && IsActive()) ? MaskUtilities.GetRectMaskForClippable(this) : null;
if (m_ParentMask != null && (newParent != m_Maskable || !newParent.IsActive()))
{
m_ParentMask.RemoveClippable(this);
UpdateCull(false);
}
if (newParent != null && newParent.IsActive())
{
newParent.AddClippable(this);
}
m_ParentMask = newParent;
}
protected override void OnDisable()
{
base.OnDisable();
if (graphic != null)
{
graphic.SetMaterialDirty();
graphic.canvasRenderer.hasPopInstruction = false;
graphic.canvasRenderer.popMaterialCount = 0;
}
StencilMaterial.Remove(m_MaskMaterial);
m_MaskMaterial = null;
StencilMaterial.Remove(m_UnmaskMaterial);
m_UnmaskMaterial = null;
MaskUtilities.NotifyStencilStateChanged(this);
}
public Material GetModifiedMaterial(Material baseMaterial)
{
var toUse = baseMaterial;
if (m_ShouldRecalculateStencil)
{
var rootCanvas = MaskUtilities.FindRootSortOverriedCanvas(transform);
m_StencilValue = MaskUtilities.GetStencilDepth(transform, rootCanvas);
m_ShouldRecalculateStencil = false;
}
Mask maskComponent = GetComponent <Mask>();
if (m_StencilValue > 0 && (maskComponent == null || !maskComponent.IsActive()))
{
var maskMat = StencilMaterial.Add(toUse, (1 << m_StencilValue) - 1, StencilOp.Keep, CompareFunction.Equal, ColorWriteMask.All, (1 << m_StencilValue) - 1, 0);
StencilMaterial.Remove(m_MaskMaterial);
m_MaskMaterial = maskMat;
toUse = m_MaskMaterial;
}
return(toUse);
}