/// <summary>
/// See IMaterialModifier.GetModifiedMaterial
/// </summary>
public virtual Material GetModifiedMaterial(Material baseMaterial)
{
var toUse = baseMaterial;
if (m_ShouldRecalculateStencil)
{
var rootCanvas = MaskUtilities.FindRootSortOverrideCanvas(transform);
m_StencilValue = maskable ? MaskUtilities.GetStencilDepth(transform, rootCanvas) : 0;
m_ShouldRecalculateStencil = false;
}
// if we have a enabled Mask component then it will
// generate the mask material. This is an optimisation
// it adds some coupling between components though :(
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);
}
/// <summary>
/// See IMaterialModifier.GetModifiedMaterial
/// </summary>
public virtual Material GetModifiedMaterial(Material baseMaterial)
{
var toUse = baseMaterial;
if (m_ShouldRecalculateStencil)
{
var rootCanvas = MaskUtilities.FindRootSortOverrideCanvas(transform);
m_StencilValue = maskable ? MaskUtilities.GetStencilDepth(transform, rootCanvas) : 0;
m_ShouldRecalculateStencil = false;
}
// if we have a enabled Mask component then it will
// generate the mask material. This is an optimisation
// it adds some coupling between components though :(
// StencilMaterial.Add(...)方法向传入的材质添加了一些模板信息（即后边的一长串参数），
// 返回设置好了模板参数的新的材质（StencilMaterial内部做了一些优化，
// 对于相同的模板参数会共用同一个材质对象）这个m_StencilValue通过一个简单的变换1 << m_StencilValue) - 1得到一个新的整数值，
// 这个值在后续的使用中称为stencilID，在StencilMaterial.Add(...)中我们看到有以下代码：
/*newEnt.customMat.SetInt("_Stencil", stencilID);
* newEnt.customMat.SetInt("_StencilOp", (int)operation);
* newEnt.customMat.SetInt("_StencilComp", (int)compareFunction);
* newEnt.customMat.SetInt("_StencilReadMask", readMask);
* newEnt.customMat.SetInt("_StencilWriteMask", writeMask);
* newEnt.customMat.SetInt("_ColorMask", (int)colorWriteMask);
* 对应的，在UI默认的shader中有：
* Stencil
* {
* Ref [_Stencil]
* Comp [_StencilComp]
* Pass [_StencilOp]
* ReadMask [_StencilReadMask]
* WriteMask [_StencilWriteMask]
* }
*
* ColorMask [_ColorMask]*/
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);
}
public virtual Material GetModifiedMaterial(Material baseMaterial)
{
Material material = baseMaterial;
if (this.m_ShouldRecalculateStencil)
{
Transform stopAfter = MaskUtilities.FindRootSortOverrideCanvas(base.transform);
this.m_StencilValue = ((!this.maskable) ? 0 : MaskUtilities.GetStencilDepth(base.transform, stopAfter));
this.m_ShouldRecalculateStencil = false;
}
Mask component = base.GetComponent <Mask>();
if (this.m_StencilValue > 0 && (component == null || !component.IsActive()))
{
Material maskMaterial = StencilMaterial.Add(material, (1 << this.m_StencilValue) - 1, StencilOp.Keep, CompareFunction.Equal, ColorWriteMask.All, (1 << this.m_StencilValue) - 1, 0);
StencilMaterial.Remove(this.m_MaskMaterial);
this.m_MaskMaterial = maskMaterial;
material = this.m_MaskMaterial;
}
return(material);
}
/// <summary>
/// <para>See IMaterialModifier.GetModifiedMaterial.</para>
/// </summary>
/// <param name="baseMaterial"></param>
public virtual Material GetModifiedMaterial(Material baseMaterial)
{
Material baseMat = baseMaterial;
if (this.m_ShouldRecalculateStencil)
{
Transform stopAfter = MaskUtilities.FindRootSortOverrideCanvas(base.transform);
this.m_StencilValue = !this.maskable ? 0 : MaskUtilities.GetStencilDepth(base.transform, stopAfter);
this.m_ShouldRecalculateStencil = false;
}
Mask component = base.GetComponent <Mask>();
if ((this.m_StencilValue <= 0) || ((component != null) && component.IsActive()))
{
return(baseMat);
}
Material material2 = StencilMaterial.Add(baseMat, (((int)1) << this.m_StencilValue) - 1, StencilOp.Keep, CompareFunction.Equal, ColorWriteMask.All, (((int)1) << this.m_StencilValue) - 1, 0);
StencilMaterial.Remove(this.m_MaskMaterial);
this.m_MaskMaterial = material2;
return(this.m_MaskMaterial);
}