From b834f90bf8f8038bb58233c0a04bd25989e83aba Mon Sep 17 00:00:00 2001 From: BlueRose <378100977@qq.com> Date: Tue, 1 Oct 2024 23:11:43 +0800 Subject: [PATCH] vault backup: 2024-10-01 23:11:43 --- .../RenderingPipeline/Materials/MeshDraw.md | 166 +++++++++++------- 1 file changed, 106 insertions(+), 60 deletions(-) diff --git a/03-UnrealEngine/Rendering/RenderingPipeline/Materials/MeshDraw.md b/03-UnrealEngine/Rendering/RenderingPipeline/Materials/MeshDraw.md index 6cf3605..623ede9 100644 --- a/03-UnrealEngine/Rendering/RenderingPipeline/Materials/MeshDraw.md +++ b/03-UnrealEngine/Rendering/RenderingPipeline/Materials/MeshDraw.md @@ -59,72 +59,118 @@ SetGraphicsPipelineState(RHICmdList, GraphicsPSOInit,0); - uint32 StencilRef = 0; ### FRHIBlendState +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： +- 颜色写入蒙版 +- 颜色混合运算 +- 颜色源混合因子 +- 颜色目标混合因子 +- Alpha混合运算 +- Alpha源混合因子 +- Alpha目标混合因子 + +颜色写入蒙版： + +```text +enum EColorWriteMask +{ + CW_RED = 0x01, + CW_GREEN = 0x02, + CW_BLUE = 0x04, + CW_ALPHA = 0x08, + + CW_NONE = 0, + CW_RGB = CW_RED | CW_GREEN | CW_BLUE, + CW_RGBA = CW_RED | CW_GREEN | CW_BLUE | CW_ALPHA, + CW_RG = CW_RED | CW_GREEN, + CW_BA = CW_BLUE | CW_ALPHA, + + EColorWriteMask_NumBits = 4, +}; +``` + +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： +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_​ + +第一个是颜色的混合方程，第二个是Alpha的混合方程。 + +### 混合运算 + +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。 + +|BlendOperation|颜色混合方程| +|---|---| +|BO_Add|C_{src} \otimes F_{src} + C_{dst} \otimes F_{dst}Csrc​⊗Fsrc​+Cdst​⊗Fdst​| +|BO_Subtract|C = C_{src} \otimes F_{src} - C_{dst} \otimes F_{dst}C=Csrc​⊗Fsrc​−Cdst​⊗Fdst​| +|BO_ReverseSubtract|C = C_{dst} \otimes F_{dst} - C_{src} \otimes F_{src}C=Cdst​⊗Fdst​−Csrc​⊗Fsrc​| +|BO_Min|C = Min(C_{src} , C_{dst} )C=Min(Csrc​,Cdst​)| +|BO_Max|C = Max(C_{src} , C_{dst} )C=Max(Csrc​,Cdst​)| +|BO_Min和BO_Max忽略了混合因子|| + +### 混合因子 + +| BlendFactor | 颜色混合因子 | Alpha混合因子 | +| ----------------------------- | ------------------------------------------------------------ | -------------------- | +| BF_Zero | F = (0,0,0)F=(0,0,0) | F=0F=0 | +| BF_One | F=(1,1,1)F=(1,1,1) | F=1F=1 | +| BF_SourceColor | F=(r_{src},g_{src},b_{src})F=(rsrc​,gsrc​,bsrc​) | – | +| BF_InverseSourceColor | F=(1-r_{src},1-g_{src},1-b_{src})F=(1−rsrc​,1−gsrc​,1−bsrc​) | – | +| BF_SourceAlpha | F=(a_{src},a_{src},a_{src})F=(asrc​,asrc​,asrc​) | F=a_{src}F=asrc​ | +| 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​ | +| BF_DestAlpha | F=(a_{dst},a_{dst},a_{dst})F=(adst​,adst​,adst​) | F=a_{dst}F=adst​ | +| 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​ | +| BF_DestColor | F=(r_{dst},g_{dst},b_{dst})F=(rdst​,gdst​,bdst​) | – | +| BF_InverseDestColor | F=(1-r_{dst},1-g_{dst},1-b_{dst})F=(1−rdst​,1−gdst​,1−bdst​) | – | +| BF_ConstantBlendFactor | F=(r,g,b)F=(r,g,b) | F=aF=a | +| BF_InverseConstantBlendFactor | F=(1-r,1-g,1-b)F=(1−r,1−g,1−b) | F=1-aF=1−a | +| BF_Source1Color | 未知 | 未知 | +| BF_InverseSource1Color | 未知 | 未知 | +| BF_Source1Alpha | 未知 | 未知 | +| BF_InverseSource1Alpha | 未知 | 未知 | + +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。 ### FRHIDepthStencilState -***TStaticDepthStencilState*** - - - ```c++ -DrawRenderState.SetDepthStencilState(TStaticDepthStencilState::GetRHI()); +TStaticDepthStencilState< + bEnableDepthWrite, // 是否启用深度写入 + DepthTest, // 深度测试比较函数 + bEnableFrontFaceStencil, // (正面)启用模板 + FrontFaceStencilTest, // (正面)模板失败操作 + FrontFaceStencilFailStencilOp, //(正面)模板测试失败时如何更新模板缓冲区 + FrontFaceDepthFailStencilOp, //(正面)深度测试失败时如何更新模板缓冲区 + FrontFacePassStencilOp, //(正面)通过模板测试时如何更新模板红冲去 + bEnableBackFaceStencil, // (背面)启用模板 + BackFaceStencilTest, // (背面)模板失败操作 + BackFaceStencilFailStencilOp, //(背面)模板测试失败时如何更新模板缓冲区 + BackFaceDepthFailStencilOp, //(背面)深度测试失败时如何更新模板缓冲区 + BackFacePassStencilOp, //(背面)通过模板测试时如何更新模板红冲去 + StencilReadMask, // 模板读取Mask + StencilWriteMask // 模板写入Mask + > +``` -template -void SetDepthStencilStateForBasePass_Internal(FMeshPassProcessorRenderState& InDrawRenderState) +#### DepthTest +深度测试比较函数。 +```c++ +enum ECompareFunction { - InDrawRenderState.SetDepthStencilState(TStaticDepthStencilState< - bDepthTest, CompareFunction, - true, CF_Always, SO_Keep, SO_Keep, SO_Replace, - false, CF_Always, SO_Keep, SO_Keep, SO_Keep, - 0xFF, StencilWriteMask>::GetRHI()); -} + CF_Less, + CF_LessEqual, + CF_Greater, + CF_GreaterEqual, + CF_Equal, + CF_NotEqual, + CF_Never, // 总是返回false + CF_Always, // 总是返回true -template -void SetDepthStencilStateForBasePass_Internal(FMeshPassProcessorRenderState& InDrawRenderState, ERHIFeatureLevel::Type FeatureLevel) -{ - const static bool bStrataDufferPassEnabled = Strata::IsStrataEnabled() && Strata::IsDBufferPassEnabled(GShaderPlatformForFeatureLevel[FeatureLevel]); - if (bStrataDufferPassEnabled) - { - SetDepthStencilStateForBasePass_Internal(InDrawRenderState); - } - else - { - SetDepthStencilStateForBasePass_Internal(InDrawRenderState); - } -} + ECompareFunction_Num, + ECompareFunction_NumBits = 3, -void SetDepthStencilStateForBasePass( - FMeshPassProcessorRenderState& DrawRenderState, - ERHIFeatureLevel::Type FeatureLevel, - bool bDitheredLODTransition, - const FMaterial& MaterialResource, - bool bEnableReceiveDecalOutput, - bool bForceEnableStencilDitherState) -{ - const bool bMaskedInEarlyPass = (MaterialResource.IsMasked() || bDitheredLODTransition) && MaskedInEarlyPass(GShaderPlatformForFeatureLevel[FeatureLevel]); - if (bEnableReceiveDecalOutput) - { - if (bMaskedInEarlyPass) - { - SetDepthStencilStateForBasePass_Internal(DrawRenderState, FeatureLevel); - } - else if (DrawRenderState.GetDepthStencilAccess() & FExclusiveDepthStencil::DepthWrite) - { - SetDepthStencilStateForBasePass_Internal(DrawRenderState, FeatureLevel); - } - else - { - SetDepthStencilStateForBasePass_Internal(DrawRenderState, FeatureLevel); - } - } - else if (bMaskedInEarlyPass) - { - DrawRenderState.SetDepthStencilState(TStaticDepthStencilState::GetRHI()); - } - - if (bForceEnableStencilDitherState) - { - SetDepthStencilStateForBasePass_Internal(DrawRenderState, FeatureLevel); - } -} + // Utility enumerations + CF_DepthNearOrEqual = (((int32)ERHIZBuffer::IsInverted != 0) ? CF_GreaterEqual : CF_LessEqual), + CF_DepthNear = (((int32)ERHIZBuffer::IsInverted != 0) ? CF_Greater : CF_Less), + CF_DepthFartherOrEqual = (((int32)ERHIZBuffer::IsInverted != 0) ? CF_LessEqual : CF_GreaterEqual), + CF_DepthFarther = (((int32)ERHIZBuffer::IsInverted != 0) ? CF_Less : CF_Greater), +}; ``` ### CustomStencil