vault backup: 2024-10-01 23:11:43
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@ -59,72 +59,118 @@ SetGraphicsPipelineState(RHICmdList, GraphicsPSOInit,0);
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- uint32 StencilRef = 0;
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- uint32 StencilRef = 0;
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### FRHIBlendState
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### FRHIBlendState
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它定义了8个渲染对象，一般我们只用第一组，它的七个参数分别是：
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- 颜色写入蒙版
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- 颜色混合运算
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- 颜色源混合因子
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- 颜色目标混合因子
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- Alpha混合运算
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- Alpha源混合因子
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- Alpha目标混合因子
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颜色写入蒙版：
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```text
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enum EColorWriteMask
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{
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CW_RED = 0x01,
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CW_GREEN = 0x02,
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CW_BLUE = 0x04,
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CW_ALPHA = 0x08,
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CW_NONE = 0,
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CW_RGB = CW_RED | CW_GREEN | CW_BLUE,
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CW_RGBA = CW_RED | CW_GREEN | CW_BLUE | CW_ALPHA,
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CW_RG = CW_RED | CW_GREEN,
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CW_BA = CW_BLUE | CW_ALPHA,
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EColorWriteMask_NumBits = 4,
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};
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```
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要继续讲解其他参数，需要先列出DirectX的[混合方程](https://zhida.zhihu.com/search?content_id=217472065&content_type=Article&match_order=1&q=%E6%B7%B7%E5%90%88%E6%96%B9%E7%A8%8B&zhida_source=entity)作为参照：
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C = C_{src} \otimes F_{src} \oplus C_{dst} \otimes F_{dst}_C_=_Csrc_⊗_Fsrc_⊕_Cdst_⊗_Fdst_A = A_{src} \otimes F_{src} \oplus A_{dst} \otimes F_{dst}_A_=_Asrc_⊗_Fsrc_⊕_Adst_⊗_Fdst_
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第一个是颜色的混合方程，第二个是Alpha的混合方程。
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### 混合运算
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混合运算符对于颜色混合方程和Alpha混合方程效果是一样的，这里就只用颜色混合方程来做讲解。
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|BlendOperation|颜色混合方程|
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|BO_Add|C_{src} \otimes F_{src} + C_{dst} \otimes F_{dst}Csrc⊗Fsrc+Cdst⊗Fdst|
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|BO_Subtract|C = C_{src} \otimes F_{src} - C_{dst} \otimes F_{dst}C=Csrc⊗Fsrc−Cdst⊗Fdst|
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|BO_ReverseSubtract|C = C_{dst} \otimes F_{dst} - C_{src} \otimes F_{src}C=Cdst⊗Fdst−Csrc⊗Fsrc|
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|BO_Min|C = Min(C_{src} , C_{dst} )C=Min(Csrc,Cdst)|
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|BO_Max|C = Max(C_{src} , C_{dst} )C=Max(Csrc,Cdst)|
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|BO_Min和BO_Max忽略了混合因子||
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### 混合因子
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| BlendFactor | 颜色混合因子 | Alpha混合因子 |
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| ----------------------------- | ------------------------------------------------------------ | -------------------- |
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| BF_Zero | F = (0,0,0)F=(0,0,0) | F=0F=0 |
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| BF_One | F=(1,1,1)F=(1,1,1) | F=1F=1 |
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| BF_SourceColor | F=(r_{src},g_{src},b_{src})F=(rsrc,gsrc,bsrc) | – |
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| BF_InverseSourceColor | F=(1-r_{src},1-g_{src},1-b_{src})F=(1−rsrc,1−gsrc,1−bsrc) | – |
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| BF_SourceAlpha | F=(a_{src},a_{src},a_{src})F=(asrc,asrc,asrc) | F=a_{src}F=asrc |
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| BF_InverseSourceAlpha | F=(1-a_{src},1-a_{src},1-a_{src})F=(1−asrc,1−asrc,1−asrc) | F=1-a_{src}F=1−asrc |
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| BF_DestAlpha | F=(a_{dst},a_{dst},a_{dst})F=(adst,adst,adst) | F=a_{dst}F=adst |
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| BF_InverseDestAlpha | F=(1-a_{dst},1-a_{dst},1-a_{dst})F=(1−adst,1−adst,1−adst) | F=1-a_{dst}F=1−adst |
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| BF_DestColor | F=(r_{dst},g_{dst},b_{dst})F=(rdst,gdst,bdst) | – |
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| BF_InverseDestColor | F=(1-r_{dst},1-g_{dst},1-b_{dst})F=(1−rdst,1−gdst,1−bdst) | – |
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| BF_ConstantBlendFactor | F=(r,g,b)F=(r,g,b) | F=aF=a |
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| BF_InverseConstantBlendFactor | F=(1-r,1-g,1-b)F=(1−r,1−g,1−b) | F=1-aF=1−a |
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| BF_Source1Color | 未知 | 未知 |
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| BF_InverseSource1Color | 未知 | 未知 |
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| BF_Source1Alpha | 未知 | 未知 |
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| BF_InverseSource1Alpha | 未知 | 未知 |
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最后四个选项没有在DirectX中找到对应的选项，没有继续探究，前面的应该足够一般使用了。
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### FRHIDepthStencilState
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### FRHIDepthStencilState
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***TStaticDepthStencilState***
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```c++
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```c++
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DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_Equal>::GetRHI());
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TStaticDepthStencilState<
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bEnableDepthWrite, // 是否启用深度写入
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DepthTest, // 深度测试比较函数
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bEnableFrontFaceStencil, // (正面)启用模板
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FrontFaceStencilTest, // (正面)模板失败操作
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FrontFaceStencilFailStencilOp, //(正面)模板测试失败时如何更新模板缓冲区
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FrontFaceDepthFailStencilOp, //(正面)深度测试失败时如何更新模板缓冲区
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FrontFacePassStencilOp, //(正面)通过模板测试时如何更新模板红冲去
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bEnableBackFaceStencil, // (背面)启用模板
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BackFaceStencilTest, // (背面)模板失败操作
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BackFaceStencilFailStencilOp, //(背面)模板测试失败时如何更新模板缓冲区
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BackFaceDepthFailStencilOp, //(背面)深度测试失败时如何更新模板缓冲区
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BackFacePassStencilOp, //(背面)通过模板测试时如何更新模板红冲去
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StencilReadMask, // 模板读取Mask
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StencilWriteMask // 模板写入Mask
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>
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```
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template<bool bDepthTest, ECompareFunction CompareFunction, uint32 StencilWriteMask>
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#### DepthTest
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void SetDepthStencilStateForBasePass_Internal(FMeshPassProcessorRenderState& InDrawRenderState)
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深度测试比较函数。
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```c++
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enum ECompareFunction
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{
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{
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InDrawRenderState.SetDepthStencilState(TStaticDepthStencilState<
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CF_Less,
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bDepthTest, CompareFunction,
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CF_LessEqual,
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true, CF_Always, SO_Keep, SO_Keep, SO_Replace,
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CF_Greater,
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false, CF_Always, SO_Keep, SO_Keep, SO_Keep,
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CF_GreaterEqual,
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0xFF, StencilWriteMask>::GetRHI());
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CF_Equal,
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}
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CF_NotEqual,
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CF_Never, // 总是返回false
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CF_Always, // 总是返回true
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template<bool bDepthTest, ECompareFunction CompareFunction>
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ECompareFunction_Num,
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void SetDepthStencilStateForBasePass_Internal(FMeshPassProcessorRenderState& InDrawRenderState, ERHIFeatureLevel::Type FeatureLevel)
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ECompareFunction_NumBits = 3,
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{
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const static bool bStrataDufferPassEnabled = Strata::IsStrataEnabled() && Strata::IsDBufferPassEnabled(GShaderPlatformForFeatureLevel[FeatureLevel]);
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if (bStrataDufferPassEnabled)
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{
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SetDepthStencilStateForBasePass_Internal<bDepthTest, CompareFunction, GET_STENCIL_BIT_MASK(STRATA_RECEIVE_DBUFFER_NORMAL, 1) | GET_STENCIL_BIT_MASK(STRATA_RECEIVE_DBUFFER_DIFFUSE, 1) | GET_STENCIL_BIT_MASK(STRATA_RECEIVE_DBUFFER_ROUGHNESS, 1) | GET_STENCIL_BIT_MASK(DISTANCE_FIELD_REPRESENTATION, 1) | STENCIL_LIGHTING_CHANNELS_MASK(0x7)>(InDrawRenderState);
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}
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else
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{
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SetDepthStencilStateForBasePass_Internal<bDepthTest, CompareFunction, GET_STENCIL_BIT_MASK(RECEIVE_DECAL, 1) | GET_STENCIL_BIT_MASK(DISTANCE_FIELD_REPRESENTATION, 1) | STENCIL_LIGHTING_CHANNELS_MASK(0x7)>(InDrawRenderState);
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}
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}
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void SetDepthStencilStateForBasePass(
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// Utility enumerations
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FMeshPassProcessorRenderState& DrawRenderState,
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CF_DepthNearOrEqual = (((int32)ERHIZBuffer::IsInverted != 0) ? CF_GreaterEqual : CF_LessEqual),
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ERHIFeatureLevel::Type FeatureLevel,
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CF_DepthNear = (((int32)ERHIZBuffer::IsInverted != 0) ? CF_Greater : CF_Less),
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bool bDitheredLODTransition,
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CF_DepthFartherOrEqual = (((int32)ERHIZBuffer::IsInverted != 0) ? CF_LessEqual : CF_GreaterEqual),
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const FMaterial& MaterialResource,
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CF_DepthFarther = (((int32)ERHIZBuffer::IsInverted != 0) ? CF_Less : CF_Greater),
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bool bEnableReceiveDecalOutput,
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};
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bool bForceEnableStencilDitherState)
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{
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const bool bMaskedInEarlyPass = (MaterialResource.IsMasked() || bDitheredLODTransition) && MaskedInEarlyPass(GShaderPlatformForFeatureLevel[FeatureLevel]);
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if (bEnableReceiveDecalOutput)
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{
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if (bMaskedInEarlyPass)
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{
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SetDepthStencilStateForBasePass_Internal<false, CF_Equal>(DrawRenderState, FeatureLevel);
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}
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else if (DrawRenderState.GetDepthStencilAccess() & FExclusiveDepthStencil::DepthWrite)
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{
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SetDepthStencilStateForBasePass_Internal<true, CF_GreaterEqual>(DrawRenderState, FeatureLevel);
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}
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else
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{
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SetDepthStencilStateForBasePass_Internal<false, CF_GreaterEqual>(DrawRenderState, FeatureLevel);
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}
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}
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else if (bMaskedInEarlyPass)
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{
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DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_Equal>::GetRHI());
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}
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if (bForceEnableStencilDitherState)
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{
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SetDepthStencilStateForBasePass_Internal<false, CF_Equal>(DrawRenderState, FeatureLevel);
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}
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}
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```
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```
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### CustomStencil
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### CustomStencil
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