*mask

1 files changed, 6 insertions, 0 deletions

diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/MaskableGraphic.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/MaskableGraphic.cs
index 51e2fe2..0d0f327 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/MaskableGraphic.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/MaskableGraphic.cs
@@ -68,6 +68,7 @@ namespace UnityEngine.UI
             if (m_ShouldRecalculateStencil)
             {
                 var rootCanvas = MaskUtilities.FindRootSortOverrideCanvas(transform);
+                // Graphic在masks下的深度，如果不是0且没有mask组件意味着是普通的非mask用graphic（如果是0一定是mask用的graphic)
                 m_StencilValue = maskable ? MaskUtilities.GetStencilDepth(transform, rootCanvas) : 0;
                 m_ShouldRecalculateStencil = false;
             }
@@ -78,6 +79,11 @@ namespace UnityEngine.UI
             Mask maskComponent = GetComponent<Mask>();
             if (m_StencilValue > 0 && (maskComponent == null || !maskComponent.IsActive()))
             {
+                // Ref       = (1 << stencilValue) - 1 
+                // Op        = Keep
+                // Func      = Equal 
+                // ReadMask  = (1 << stencilValue) - 1 
+                // WriteMask = 0
                 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;