\u4ec0\u4e48\u662fBasePass<\/h1>\n
BasePass\u662f\u4f4d\u4e8e\u5ef6\u8fdf\u7ba1\u7ebf\u7684PrePass\u4e4b\u540e\u7684\u4e00\u4e2aPass\uff0cDeferred \u4e0b\u4e0d\u900f\u660e BasePass \u4ee5\u5199 GBuffer + \u96fe\u6548 + \u90e8\u5206\u95f4\u63a5\/\u81ea\u53d1\u5149\u4e3a\u4e3b\uff1b\u534a\u900f\u660e\u7b49\u53e6\u6709\u8def\u5f84<\/p>\n
\u4e3a\u4ec0\u4e48\u9700\u8981BasePass<\/h1>\n
\u8fd9\u662f\u4e00\u4e2a\u8001\u751f\u5e38\u8c08\u7684\u95ee\u9898\uff0c\u8fd9\u91cc\u7b80\u5355\u63d0\u4e00\u4e0b\uff0c\u4e3b\u8981\u4f5c\u7528\u5c31\u662f\u4f18\u5316\u5149\u7167\u590d\u6742\u5ea6\uff0c\u907f\u514d\u65e0\u7528\u7684\u5149\u7167\u8ba1\u7b97<\/p>\n
UE5 BasePass<\/h1>\nCPU\u7aef<\/h2>\n\u8bbe\u5b9aGBuffer\u53caFormat<\/h3>\n\n- \u4f4d\u7f6e\uff1aGBufferInfo.cpp->FetchLegacyGBufferInfo()<\/p>\n<\/li>\n
- \n
\u5b9e\u73b0<\/p>\n
Info.Targets[0].Init(GBT_Unorm_11_11_10, TEXT(\"Lighting\"), false, true, true, true);\nInfo.Targets[1].Init(NormalGBufferFormatTarget,TEXT(\"GBufferA\"), false, true, true, true);\nInfo.Targets[2].Init(DiffuseAndSpecularGBufferFormat, TEXT(\"GBufferB\"), false, true, true, true);\n\nconst bool bLegacyAlbedoSrgb = true;\nInfo.Targets[3].Init(DiffuseAndSpecularGBufferFormat, TEXT(\"GBufferC\"), bLegacyAlbedoSrgb && !bHighPrecisionGBuffers, true, true, true);\n\n\/\/ This code should match TBasePassPS\nif (Params.bHasVelocity == 0 && Params.bHasTangent == 0)\n{\n TargetGBufferD = 4;\n Info.Targets[4].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 5;\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, true);\n }\n}\nelse if (Params.bHasVelocity)\n{\n TargetVelocity = 4;\n TargetGBufferD = 5;\n\n \/\/ note the false for use extra flags for velocity, not quite sure of all the ramifications, but this keeps it consistent with previous usage\n Info.Targets[4].Init(Params.bUsesVelocityDepth ? GBT_Unorm_16_16_16_16 : (IsAndroidOpenGLESPlatform(Params.ShaderPlatform) ? GBT_Float_16_16 : GBT_Unorm_16_16), TEXT(\"Velocity\"), false, true, true, false);\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 6;\n Info.Targets[6].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, false);\n }\n}\nelse if (Params.bHasTangent)\n{\n TargetGBufferF = 4;\n TargetGBufferD = 5;\n Info.Targets[4].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferF\"), false, true, true, true);\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 6;\n Info.Targets[6].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, true);\n }\n}\nelse\n{\n \/\/ should never hit this path\n check(0);\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u6e05\u7a7aGBuffer<\/h3>\nstatic const auto ClearMethodCVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT(\"r.ClearSceneMethod\"));\n\nbool bRequiresRHIClear = true;\nbool bRequiresFarZQuadClear = false;\n\nif (ClearMethodCVar)\n{\n int32 ClearMethod = ClearMethodCVar->GetValueOnRenderThread();\n\n if (ClearMethod == 0 && !ViewFamily.EngineShowFlags.Game)\n {\n \/\/ Do not clear the scene only if the view family is in game mode.\n ClearMethod = 1;\n }\n\n switch (ClearMethod)\n {\n case 0: \/\/ No clear\n bRequiresRHIClear = false;\n bRequiresFarZQuadClear = false;\n break;\n\n case 1: \/\/ RHICmdList.Clear\n bRequiresRHIClear = true;\n bRequiresFarZQuadClear = false;\n break;\n\n case 2: \/\/ Clear using far-z quad\n bRequiresFarZQuadClear = true;\n bRequiresRHIClear = false;\n break;\n }\n}\n<\/code><\/pre>\n\u6e05\u7a7aGBuffer\u7684\u65b9\u5f0f\u7531\u63a7\u5236\u53f0\u6307\u4ee4\u663e\u793a\u6307\u5b9a\uff0c\u6e05\u7a7a\u65b9\u5f0f\u6709\u4e09\u79cd\uff0c\u9ed8\u8ba4RHIClear<\/strong>\uff1a<\/p>\n\n- NoClear\n
\n- \u76ee\u7684\uff1a\u4e0d\u6e05\u9664Clear<\/li>\n
- \u4f18\u70b9\uff1a\u7701\u5e26\u5bbd<\/li>\n
- \u7f3a\u70b9\uff1a\u53ef\u80fd\u6b8b\u7559\u5783\u573e\u6570\u636e<\/li>\n<\/ul>\n<\/li>\n
- RHIClear\n
\n- \u76ee\u7684\uff1a\u6574\u5c4f\u786c\u4ef6 Clear<\/li>\n
- \u4f18\u70b9\uff1a\u5b9e\u73b0\u7b80\u5355\u3001\u884c\u4e3a\u7a33\u5b9a<\/li>\n
- \u7f3a\u70b9\uff1a\u6574\u5c4f\u5e26\u5bbd<\/li>\n<\/ul>\n<\/li>\n
- QuadAtMaxZ\n
\n- \u76ee\u7684\uff1a\u5728Clear\u7684\u60c5\u51b5\u4e0b\uff0c\u8282\u7701\u5e26\u5bbd<\/li>\n
- \u4f18\u70b9\uff1a\u4f7f\u7528Prepass\u6df1\u5ea6\u505a\u6df1\u5ea6\u6d4b\u8bd5\n
\n- \u753b\u4e00\u4e2a\u5168\u5c4f Quad\uff0c\u6df1\u5ea6\u8bbe\u5728 MaxZ<\/li>\n
- \u2022 \u6df1\u5ea6\u6d4b\u8bd5 CF_GreaterEqual\uff08Reversed-Z\uff09<\/li>\n
- \u2022 \u53ea\u6709\u4ecd\u4e3a MaxZ \u7684\u50cf\u7d20\u901a\u8fc7\u6d4b\u8bd5\u5e76\u88ab\u5199\u4e0a\u80cc\u666f\u8272<\/li>\n
- \u2022 \u5df2\u6709\u51e0\u4f55\u7684\u50cf\u7d20\u6df1\u5ea6\u66f4\u8fd1 \u2192 \u4e0d\u4f1a\u88ab\u8986\u76d6<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
if (ViewFamily.EngineShowFlags.Wireframe || ViewFamily.EngineShowFlags.ShaderComplexity || ViewFamily.EngineShowFlags.StationaryLightOverlap)\n{\n bRequiresRHIClear = true;\n bRequiresFarZQuadClear = false;\n}\n<\/code><\/pre>\n\u8fd9\u91cc\u4f9d\u7136\u5728\u5224\u65ad\u5982\u4f55Clear RT\uff0c\u5224\u65adView\u89c6\u53e3\u76ee\u524d\u662f\u4e0d\u662f\u7ebf\u6846\u6a21\u5f0f\u3001shader\u590d\u6742\u5ea6\u6a21\u5f0f\u3001\u9759\u6b62\u5149\u4ea4\u9519\u6d4b\u8bd5\u6a21\u5f0f\uff0c\u662f\u5219\u542f\u7528RHIClear\uff0c\u7981\u7528QuadAtMaxZ\uff0c\u4e5f\u5c31\u662f\u8bf4\u8fd9\u4e09\u79cd\u6a21\u5f0f\u4e0d\u80fd\u8d70prepass\u6df1\u5ea6\u6d4b\u8bd5\u4f18\u5316<\/p>\n
\u83b7\u53d6GBuffer RenderTargets<\/h3>\nTStaticArray<FTextureRenderTargetBinding, MaxSimultaneousRenderTargets> BasePassTextures;\nuint32 BasePassTextureCount = SceneTextures.GetGBufferRenderTargets(BasePassTextures);\n<\/code><\/pre>\n\u5148\u83b7\u53d6Base Pass\u7528\u5230\u7684RenderTargets<\/p>\n
TArrayView<FTextureRenderTargetBinding> BasePassTexturesView = MakeArrayView(BasePassTextures.GetData(), BasePassTextureCount);\n<\/code><\/pre>\n\u7531\u4e8eBasePassTextures\u521d\u59cb\u5316\u4e00\u6b21\u6027\u5206\u914d\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u7ec4\uff0cRenderTargets\u53ef\u80fd\u4e0d\u4f1a\u5b8c\u5168\u5360\u6ee1\uff0c\u8fd9\u610f\u5473\u7740\u4f1a\u5269\u4e0b\u7a7a\u4f4d\uff0c\u4e0d\u80fd\u628a\u5e26\u6709\u7a7a\u4f4d\u7684BasePassTextures\u4f20\u7ed9\u5176\u4ed6\u5bf9\u8c61\uff0c\u56e0\u6b64MakeArrayView\u6267\u884c\u4e86\u53bb\u7a7a<\/p>\n
FRDGTextureRef BasePassDepthTexture = SceneTextures.Depth.Target;\nFLinearColor SceneColorClearValue = FLinearColor::Black;\n<\/code><\/pre>\n\u83b7\u53d6Depth Texture\uff0c\u4ee5\u53caClear Color<\/p>\n
Clear GBuffer Render Targets<\/h3>\n\n- \u51b3\u5b9aClear Color\n
if (ViewFamily.EngineShowFlags.ShaderComplexity || ViewFamily.EngineShowFlags.StationaryLightOverlap)\n{\n SceneColorClearValue = FLinearColor(0, 0, 0, kSceneColorClearAlpha);\n}\nelse\n{\n SceneColorClearValue = FLinearColor(InViews[0].BackgroundColor.R, InViews[0].BackgroundColor.G, InViews[0].BackgroundColor.B, kSceneColorClearAlpha);\n}\n<\/code><\/pre>\nDebug\u6a21\u5f0fClear Color\u4e3a\u9ed1\uff0c\u6b63\u5e38\u60c5\u51b5Clear Color\u4e3a\u80cc\u666f\u8272<\/p>\n<\/li>\n
- \n
\u51b3\u5b9aclear\u65b9\u5f0f<\/p>\n
ERenderTargetLoadAction ColorLoadAction = ERenderTargetLoadAction::ELoad;\n\nif (SceneTextures.Color.Target->Desc.ClearValue.GetClearColor() == SceneColorClearValue)\n{\n ColorLoadAction = ERenderTargetLoadAction::EClear;\n}\nelse\n{\n ColorLoadAction = ERenderTargetLoadAction::ENoAction;\n}\n<\/code><\/pre>\n\n- EClear\uff1aGPU\u786c\u4ef6 Clear\uff0cclear\u6210ClearColor<\/li>\n
- ENoAction\uff1a\u4e0d Load\u3001\u4e5f\u4e0d Clear<\/li>\n
- ELoad\uff1a\u4fdd\u7559\u5df2\u6709\u5185\u5bb9<\/li>\n<\/ul>\n<\/li>\n
- Pass Parameter\u7ed1\u5b9aRenderTargets\n
auto* PassParameters = GraphBuilder.AllocParameters<FRenderTargetParameters>();\nPassParameters->RenderTargets = GetRenderTargetBindings(ColorLoadAction, BasePassTexturesView);\n<\/code><\/pre>\n<\/li>\n- \u5904\u7406GBufferD\n
const FGBufferBindings& GBufferBindings = SceneTextures.Config.GBufferBindings[GBL_Default];\nif (!CVarClearGBufferDBeforeBasePass.GetValueOnRenderThread() && GBufferBindings.GBufferD.Index > 0 && GBufferBindings.GBufferD.Index < (int32)BasePassTextureCount)\n{\n PassParameters->RenderTargets[GBufferBindings.GBufferD.Index].SetLoadAction(ERenderTargetLoadAction::ENoAction);\n}\n<\/code><\/pre>\n\u82e5\u660e\u786e\u6307\u51faBase Pass\u6267\u884c\u524d\uff0c\u4e0dclear GBufferD\uff0cGBufferD\u8bbe\u7f6e\u4e0dclear \u4e0dload<\/p>\n
GBufferD \u5e38\u5b58 PerObject Data \/ Custom Data\uff0c\u6709\u65f6 Base Pass \u4f1a\u5b8c\u6574\u8986\u76d6\uff0c\u63d0\u524d\u6e05\u662f\u6d6a\u8d39<\/p>\n<\/li>\n
- \n
\u5f53\u4e0dClear\uff0c\u4e5f\u4e0dLoad<\/p>\n
GraphBuilder.AddPass(RDG_EVENT_NAME(\"GBufferClear\"), PassParameters, ERDGPassFlags::Raster,\n[PassParameters, ColorLoadAction, SceneColorClearValue](FRDGAsyncTask, FRHICommandList& RHICmdList)\n{\nconst FRenderTargetBindingSlots& RenderTargets = PassParameters->RenderTargets;\n FLinearColor ClearColors[MaxSimultaneousRenderTargets];\n FRHITexture* Textures[MaxSimultaneousRenderTargets];\n int32 TextureIndex = 0;\n\n RenderTargets.Enumerate([&](const FRenderTargetBinding& RenderTarget)\n {\n FRHITexture* TextureRHI = RenderTarget.GetTexture()->GetRHI();\n ClearColors[TextureIndex] = TextureIndex == 0 ? SceneColorClearValue : TextureRHI->GetClearColor();\n Textures[TextureIndex] = TextureRHI;\n ++TextureIndex;\n });\n\n \/\/ Clear color only; depth-stencil is fast cleared.\n DrawClearQuadMRT(RHICmdList, true, TextureIndex, ClearColors, false, 0, false, 0);\n});\n<\/code><\/pre>\n\u5f53\u786c\u4ef6\u4e0d\u505a\u4efb\u4f55\u5904\u7406\u65f6\uff0c\u624d\u6267\u884cShader Clear<\/p>\n
Scene Color Clear \u4e3aSceneColorClearValue\uff0c\u5176\u4ed6\u7684Clear\u4e3a\u5404\u81ea\u7eb9\u7406\u6ce8\u518c\u7684 GetClearColor()<\/p>\n<\/li>\n<\/ul>\n
RenderBasePass<\/h3>\nLoad GBuffer<\/h4>\nFRenderTargetBindingSlots BasePassRenderTargets = GetRenderTargetBindings(ERenderTargetLoadAction::ELoad, BasePassTexturesView);\nBasePassRenderTargets.DepthStencil = FDepthStencilBinding(BasePassDepthTexture, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil);\n\nBasePassRenderTargets.DepthStencil = FDepthStencilBinding(BasePassDepthTexture, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil);\n\nconst bool bAllowReadOnlyDepthBasePass = bIsEarlyDepthComplete\n && !ViewFamily.EngineShowFlags.ShaderComplexity\n && !ViewFamily.UseDebugViewPS()\n && !ViewFamily.EngineShowFlags.Wireframe\n && !ViewFamily.EngineShowFlags.LightMapDensity;\n\nconst FExclusiveDepthStencil::Type BasePassDepthStencilAccess =\n bAllowReadOnlyDepthBasePass\n ? FExclusiveDepthStencil::DepthRead_StencilWrite\n : FExclusiveDepthStencil::DepthWrite_StencilWrite;\n<\/code><\/pre>\n\u53ea\u6709\u662f\u975eDebug\u6a21\u5f0f\u4e14prepass\u6267\u884c\u4e86\uff0c\u624d\u8d70DepthRead_StencilWrite\uff0c\u5426\u5219DepthWrite_StencilWrite<\/p>\n
RenderNaniteBasePass<\/h4>\nauto RenderNaniteBasePass = [&](FViewInfo& View, int32 ViewIndex)\n{\n Nanite::FRasterResults& RasterResults = NaniteRasterResults[ViewIndex];\n\n Nanite::DispatchBasePass(\n GraphBuilder,\n NaniteBasePassShadingCommands,\n Renderer,\n SceneTextures,\n BasePassRenderTargets,\n DBufferTextures,\n *Scene,\n View,\n uint32(ViewIndex),\n RasterResults\n );\n}\n<\/code><\/pre>\n\u7531\u4e8eNanite\u8fd8\u672a\u63a5\u89e6\uff0c\u8fd9\u91cc\u5c31\u4e0d\u73ed\u95e8\u5f04\u65a7\u4e86\uff0c\u53ea\u9700\u77e5\u9053RenderNaniteBasePass\u6e32\u67d3\u7684\u662fNanite\u7269\u4f53\u7684GBuffer<\/p>\n
Render Base Pass<\/h4>\n
\u4f9d\u7136\u904d\u5386View\u6e32\u67d3Base Pass<\/p>\n
\n- \u5224\u65adLumen\u662f\u5426\u542f\u7528\n
const bool bLumenGIEnabled = Renderer.GetViewPipelineState(View).DiffuseIndirectMethod == EDiffuseIndirectMethod::Lumen;\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u8ba1\u7b97\u6e32\u67d3\u72b6\u6001<\/h5>\nFMeshPassProcessorRenderState DrawRenderState;\n\nSetupBasePassState(BasePassDepthStencilAccess, ViewFamily.EngineShowFlags.ShaderComplexity, DrawRenderState);\n<\/code><\/pre>\nvoid SetupBasePassState(FExclusiveDepthStencil::Type BasePassDepthStencilAccess, const bool bShaderComplexity, FMeshPassProcessorRenderState& DrawRenderState)\n{\n DrawRenderState.SetDepthStencilAccess(BasePassDepthStencilAccess);\n\n if (bShaderComplexity)\n {\n \/\/ Additive blending when shader complexity viewmode is enabled.\n DrawRenderState.SetBlendState(TStaticBlendState<CW_RGBA, BO_Add, BF_One, BF_One, BO_Add, BF_Zero, BF_One>::GetRHI());\n \/\/ Disable depth writes as we have a full depth prepass.\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_DepthNearOrEqual>::GetRHI());\n }\n else\n {\n \/\/ Opaque blending for all G buffer targets, depth tests and writes.\n static const auto CVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT(\"r.BasePassOutputsVelocityDebug\"));\n if (CVar && CVar->GetValueOnRenderThread() == 2)\n {\n DrawRenderState.SetBlendState(TStaticBlendStateWriteMask<CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_NONE>::GetRHI());\n }\n else\n {\n DrawRenderState.SetBlendState(TStaticBlendStateWriteMask<CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA>::GetRHI());\n }\n\n if (DrawRenderState.GetDepthStencilAccess() & FExclusiveDepthStencil::DepthWrite)\n {\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<true, CF_DepthNearOrEqual>::GetRHI());\n }\n else\n {\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_DepthNearOrEqual>::GetRHI());\n }\n }\n}\n<\/code><\/pre>\n\n- DrawRenderState\u8bbe\u7f6e\u6df1\u5ea6\u6a21\u677f\u6d4b\u8bd5<\/li>\n
- \u5224\u65ad\u662f\u5426\u662fShaderComplexity Debug\u6a21\u5f0f\n
\n- \u662f\uff1a\u8bbe\u7f6e\u9002\u5408ShaderComplexity\u7684\u6df1\u5ea6\u6a21\u677f\u6d4b\u8bd5(\u4e0d\u5199\u6df1\u5ea6)\u3001Blend\u6d4b\u8bd5(Additive)<\/li>\n
- \u5426\uff1a\u8bbe\u7f6eopaque blend<\/li>\n
- \u5224\u65ad\u662f\u5426Debug Velocity\n
\n- \u662f\uff1aGBuffer \u524d6\u4e2aRT\u7684Color \u56db\u901a\u9053\u90fd\u5199\uff0c\u7b2c\u4e03\u4e2aRT\u4e0d\u5199Color\uff0c\u7b2c\u516b\u4e2a\u9ed8\u8ba4Color \u56db\u901a\u9053\u90fd\u5199<\/li>\n
- \u5426\uff1aGBuffer 8\u4e2aRT\u7684Color \u56db\u901a\u9053\u90fd\u5199<\/li>\n<\/ul>\n<\/li>\n
- \u5224\u65ad\u662f\u5426Depth Write\n
\n- \u662f\uff1a\u542f\u7528\u6df1\u5ea6\u5199\u5165\uff0c\u6df1\u5ea6\u6d4b\u8bd5\u4e3a\u6df1\u5ea6\u503c\u5c0f\u4e8e\u7b49\u4e8e<\/li>\n
- \u5426\uff1a\u7981\u7528\u6df1\u5ea6\u5199\u5165\uff0c\u6df1\u5ea6\u6d4b\u8bd5\u4e3a\u6df1\u5ea6\u503c\u5c0f\u4e8e\u7b49\u4e8e<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
\u7ed1\u5b9aPass Parameter<\/h5>\nBEGIN_SHADER_PARAMETER_STRUCT(FOpaqueBasePassParameters, )\n SHADER_PARAMETER_STRUCT_INCLUDE(FViewShaderParameters, View)\n SHADER_PARAMETER_STRUCT_REF(FReflectionCaptureShaderData, ReflectionCapture)\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FOpaqueBasePassUniformParameters, BasePass)\n SHADER_PARAMETER_STRUCT_INCLUDE(FInstanceCullingDrawParams, InstanceCullingDrawParams)\n RENDER_TARGET_BINDING_SLOTS()\nEND_SHADER_PARAMETER_STRUCT()\n\nBEGIN_SHADER_PARAMETER_STRUCT(FViewShaderParameters, )\n SHADER_PARAMETER_STRUCT_REF(FViewUniformShaderParameters, View)\n SHADER_PARAMETER_STRUCT_REF(FInstancedViewUniformShaderParameters, InstancedView)\nEND_SHADER_PARAMETER_STRUCT()\n\nBEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FReflectionCaptureShaderData,)\n SHADER_PARAMETER_ARRAY(FVector4f,PositionHighAndRadius,[GMaxNumReflectionCaptures])\n \/\/ W is unused\n SHADER_PARAMETER_ARRAY(FVector4f,PositionLow,[GMaxNumReflectionCaptures])\n \/\/ R is brightness, G is array index, B is shape\n SHADER_PARAMETER_ARRAY(FVector4f,CaptureProperties,[GMaxNumReflectionCaptures])\n SHADER_PARAMETER_ARRAY(FVector4f,CaptureOffsetAndAverageBrightness,[GMaxNumReflectionCaptures])\n \/\/ Stores the box transform for a box shape, other data is packed for other shapes\n SHADER_PARAMETER_ARRAY(FMatrix44f,BoxTransform,[GMaxNumReflectionCaptures])\n SHADER_PARAMETER_ARRAY(FVector4f,BoxScales,[GMaxNumReflectionCaptures])\nEND_GLOBAL_SHADER_PARAMETER_STRUCT()\n\nBEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FOpaqueBasePassUniformParameters,)\n SHADER_PARAMETER_STRUCT(FSharedBasePassUniformParameters, Shared)\n SHADER_PARAMETER_STRUCT(FSubstrateBasePassUniformParameters, Substrate)\n \/\/ Forward shading \n SHADER_PARAMETER(int32, UseForwardScreenSpaceShadowMask)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, ForwardScreenSpaceShadowMaskTexture)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, IndirectOcclusionTexture)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, ResolvedSceneDepthTexture)\n \/\/ DBuffer decals\n SHADER_PARAMETER_STRUCT_INCLUDE(FDBufferParameters, DBuffer)\n \/\/ Misc\n SHADER_PARAMETER_TEXTURE(Texture2D, PreIntegratedGFTexture)\n SHADER_PARAMETER_SAMPLER(SamplerState, PreIntegratedGFSampler)\n SHADER_PARAMETER(int32, Is24BitUnormDepthStencil)\n SHADER_PARAMETER_RDG_BUFFER_SRV(StructuredBuffer<float4>, EyeAdaptationBuffer)\nEND_GLOBAL_SHADER_PARAMETER_STRUCT()\n\nBEGIN_SHADER_PARAMETER_STRUCT(FInstanceCullingDrawParams, )\n RDG_BUFFER_ACCESS(DrawIndirectArgsBuffer, ERHIAccess::IndirectArgs)\n RDG_BUFFER_ACCESS(InstanceIdOffsetBuffer, ERHIAccess::VertexOrIndexBuffer)\n SHADER_PARAMETER(uint32, InstanceDataByteOffset) \/\/ offset into per-instance buffer\n SHADER_PARAMETER(uint32, IndirectArgsByteOffset) \/\/ offset into indirect args buffer\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FInstanceCullingGlobalUniforms, InstanceCulling) \n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FSceneUniformParameters, Scene)\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FBatchedPrimitiveParameters, BatchedPrimitive)\nEND_SHADER_PARAMETER_STRUCT()\n<\/code><\/pre>\nPass Parameter\u5305\u542bView\u3001ReflectionCaptureData\u3001InstanceCulling\u3001OpaqueBasePassUniform<\/p>\n
FOpaqueBasePassParameters* PassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();\nPassParameters->View = View.GetShaderParameters();\nPassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;\nPassParameters->BasePass = CreateOpaqueBasePassUniformBuffer(GraphBuilder, View, ViewIndex, ForwardBasePassTextures, DBufferTextures, bLumenGIEnabled);\nPassParameters->RenderTargets = BasePassRenderTargets;\nPassParameters->RenderTargets.ShadingRateTexture = GVRSImageManager.GetVariableRateShadingImage(GraphBuilder, View, FVariableRateShadingImageManager::EVRSPassType::BasePass);\n\n<\/code><\/pre>\nDispatch Base & Sky Pass<\/h5>\n\n- \u5148\u5224\u65adView\u662f\u5426\u53ef\u4ee5\u6267\u884cBase Pass\n
const bool bShouldRenderView = View.ShouldRenderView();\n\nbool ShouldRenderView() const \n{\n if (bHasNoVisiblePrimitive)\n {\n return false;\n }\n else if (!bIsSinglePassStereo)\n {\n return true;\n }\n else if (bIsSinglePassStereo && !IStereoRendering::IsASecondaryPass(StereoPass))\n {\n return true;\n }\n else\n {\n return false;\n }\n}\n<\/code><\/pre>\n\u82e5\u6ca1\u6709\u53ef\u89c1\u56fe\u5143\u4e0d\u753b<\/p>\n<\/li>\n
- \n
\u82e5View\u53ef\u4ee5\u6267\u884cBase Pass\uff0c\u4e14MeshDrawCommandPasses[EMeshPass::BasePass]\u4e0d\u4e3anull\uff0cDispatch Base Pass<\/p>\n
if (auto* Pass = View.ParallelMeshDrawCommandPasses[EMeshPass::BasePass]; Pass && bShouldRenderView)\n{\n Pass->BuildRenderingCommands(GraphBuilder, Scene->GPUScene, PassParameters->InstanceCullingDrawParams);\n\n GraphBuilder.AddDispatchPass(\n RDG_EVENT_NAME(\"BasePassParallel\"),\n PassParameters,\n ERDGPassFlags::Raster,\n [Pass, PassParameters](FRDGDispatchPassBuilder& DispatchPassBuilder)\n {\n Pass->Dispatch(DispatchPassBuilder, &PassParameters->InstanceCullingDrawParams);\n });\n}\n<\/code><\/pre>\n<\/li>\n- Dispatch Nanite Base Pass\n
const bool bShouldRenderViewForNanite = bNaniteEnabled\n && !View.bHasNoVisiblePrimitive\n && (!bDrawSceneViewsInOneNanitePass || ViewIndex == 0); \nif (bShouldRenderViewForNanite)\n{\n check(Renderer.ShouldRenderPrePass());\n\n RenderNaniteBasePass(View, ViewIndex);\n}\n<\/code><\/pre>\n<\/li>\n- Dispatch Sky Atmosphere\n
if (auto* Pass = View.ParallelMeshDrawCommandPasses[EMeshPass::SkyPass]; Pass && bShouldRenderView && View.Family->EngineShowFlags.Atmosphere)\n{\n FOpaqueBasePassParameters* SkyPassPassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();\n SkyPassPassParameters->BasePass = PassParameters->BasePass;\n SkyPassPassParameters->RenderTargets = BasePassRenderTargets;\n SkyPassPassParameters->View = View.GetShaderParameters();\n SkyPassPassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;\n\n \/\/ Remove all but the SceneColor\n for (uint32 i = 1; i < MaxSimultaneousRenderTargets; ++i)\n {\n SkyPassPassParameters->RenderTargets[i] = FRenderTargetBinding();\n }\n\n Pass->BuildRenderingCommands(GraphBuilder, Scene->GPUScene, SkyPassPassParameters->InstanceCullingDrawParams);\n\n GraphBuilder.AddDispatchPass(\n RDG_EVENT_NAME(\"SkyPassParallel\"),\n SkyPassPassParameters,\n ERDGPassFlags::Raster,\n [Pass, SkyPassPassParameters](FRDGDispatchPassBuilder& DispatchPassBuilder)\n {\n Pass->Dispatch(DispatchPassBuilder, &SkyPassPassParameters->InstanceCullingDrawParams);\n });\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u7ed1\u5b9a\u6e32\u67d3\u72b6\u6001<\/h4>\n
\u4f9d\u7136Process\u83b7\u53d6\u7ed1\u5b9aShader\u3001\u8bbe\u7f6eDepthStencilc\u6d4b\u8bd5\u3001\u6392\u5e8f\uff0c\u6d41\u7a0b\u4e0e\u4e00\u822c\u7684Pass\u7c7b\u4f3c\uff0c\u4e0d\u518d\u8d58\u8ff0\uff0c\u8fd9\u91cc\u53ea\u63d0\u4e24\u4e2a\u989d\u5916\u7684\u64cd\u4f5c<\/p>\n
\n- \u8bbe\u7f6eDecal Stencil Ref\n
if (bEnableReceiveDecalOutput)\n{\nuint8 StencilValue = 0;\nStencilValue = \n GET_STENCIL_BIT_MASK(RECEIVE_DECAL, PrimitiveSceneProxy ? !!PrimitiveSceneProxy->ReceivesDecals() : 0x00)\n | GET_STENCIL_BIT_MASK(RAY_TRACING_REPRESENTATION, bHasRayTracingRepresentation)\n | STENCIL_LIGHTING_CHANNELS_MASK(PrimitiveSceneProxy ? PrimitiveSceneProxy->GetLightingChannelStencilValue() : 0x00);\n DrawRenderState.SetStencilRef(StencilValue);\n}\n<\/code><\/pre>\n\u7528\u4e8e\u6807\u8bb0Decal \u6e32\u67d3\u533a\u57df<\/p>\n<\/li>\n
- \n
\u82e5\u6750\u8d28\u7c7b\u578b\u662fTranslucent\uff0c\u800c\u975eopaque\uff0c\u5219\u8bbe\u7f6e\u9002\u5408Translucent\u7684\u6e32\u67d3\u72b6\u6001<\/p>\n
if (bTranslucentBasePass)\n{\n SetTranslucentRenderState(DrawRenderState, MaterialResource, GShaderPlatformForFeatureLevel[FeatureLevel], TranslucencyPassType);\n}\n<\/code><\/pre>\n<\/li>\n- \u7ed1\u5b9a\u7684Shader\n
\n- VS Shader<\/li>\n<\/ul>\n
#define IMPLEMENT_BASEPASS_VERTEXSHADER_TYPE(LightMapPolicyType,LightMapPolicyName) \\\n typedef TBasePassVS< LightMapPolicyType > TBasePassVS##LightMapPolicyName ; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassVS##LightMapPolicyName,TEXT(\"\/Engine\/Private\/BasePassVertexShader.usf\"),TEXT(\"Main\"),SF_Vertex);\n\n<\/code><\/pre>\n\n- PS Shader<\/li>\n<\/ul>\n
#define IMPLEMENT_BASEPASS_PIXELSHADER_TYPE(LightMapPolicyType,LightMapPolicyName,bEnableSkyLight,SkyLightName,GBufferLayout,LayoutName) \\\n typedef TBasePassPS<LightMapPolicyType, bEnableSkyLight, GBufferLayout> TBasePassPS##LightMapPolicyName##SkyLightName##LayoutName; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassPS##LightMapPolicyName##SkyLightName##LayoutName,TEXT(\"\/Engine\/Private\/BasePassPixelShader.usf\"),TEXT(\"MainPS\"),SF_Pixel);\n\n#define IMPLEMENT_BASEPASS_COMPUTESHADER_TYPE(LightMapPolicyType,LightMapPolicyName,bEnableSkyLight,SkyLightName,bVoxel,VoxelName) \\\n typedef TBasePassCS<LightMapPolicyType, bEnableSkyLight, bVoxel, SF_Compute> TBasePassCS##LightMapPolicyName##SkyLightName##VoxelName; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassCS##LightMapPolicyName##SkyLightName##VoxelName,TEXT(\"\/Engine\/Private\/BasePassPixelShader.usf\"),TEXT(\"MainCS\"),SF_Compute);\n\n<\/code><\/pre>\n<\/li>\n<\/ul>\nGPU\u7aef<\/h2>\n
![\"\"](\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\")
\n![\"\"](\"https:\/\/pic1.imgdb.cn\/item\/6a53c5324893f89183bb0bfe.png\")
\u8bbe\u5b9aGBuffer\u53caFormat<\/h3>\n\n- \u4f4d\u7f6e\uff1aGBufferInfo.cpp->FetchLegacyGBufferInfo()<\/p>\n<\/li>\n
- \n
\u5b9e\u73b0<\/p>\n
Info.Targets[0].Init(GBT_Unorm_11_11_10, TEXT(\"Lighting\"), false, true, true, true);\nInfo.Targets[1].Init(NormalGBufferFormatTarget,TEXT(\"GBufferA\"), false, true, true, true);\nInfo.Targets[2].Init(DiffuseAndSpecularGBufferFormat, TEXT(\"GBufferB\"), false, true, true, true);\n\nconst bool bLegacyAlbedoSrgb = true;\nInfo.Targets[3].Init(DiffuseAndSpecularGBufferFormat, TEXT(\"GBufferC\"), bLegacyAlbedoSrgb && !bHighPrecisionGBuffers, true, true, true);\n\n\/\/ This code should match TBasePassPS\nif (Params.bHasVelocity == 0 && Params.bHasTangent == 0)\n{\n TargetGBufferD = 4;\n Info.Targets[4].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 5;\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, true);\n }\n}\nelse if (Params.bHasVelocity)\n{\n TargetVelocity = 4;\n TargetGBufferD = 5;\n\n \/\/ note the false for use extra flags for velocity, not quite sure of all the ramifications, but this keeps it consistent with previous usage\n Info.Targets[4].Init(Params.bUsesVelocityDepth ? GBT_Unorm_16_16_16_16 : (IsAndroidOpenGLESPlatform(Params.ShaderPlatform) ? GBT_Float_16_16 : GBT_Unorm_16_16), TEXT(\"Velocity\"), false, true, true, false);\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 6;\n Info.Targets[6].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, false);\n }\n}\nelse if (Params.bHasTangent)\n{\n TargetGBufferF = 4;\n TargetGBufferD = 5;\n Info.Targets[4].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferF\"), false, true, true, true);\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 6;\n Info.Targets[6].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, true);\n }\n}\nelse\n{\n \/\/ should never hit this path\n check(0);\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u6e05\u7a7aGBuffer<\/h3>\nstatic const auto ClearMethodCVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT(\"r.ClearSceneMethod\"));\n\nbool bRequiresRHIClear = true;\nbool bRequiresFarZQuadClear = false;\n\nif (ClearMethodCVar)\n{\n int32 ClearMethod = ClearMethodCVar->GetValueOnRenderThread();\n\n if (ClearMethod == 0 && !ViewFamily.EngineShowFlags.Game)\n {\n \/\/ Do not clear the scene only if the view family is in game mode.\n ClearMethod = 1;\n }\n\n switch (ClearMethod)\n {\n case 0: \/\/ No clear\n bRequiresRHIClear = false;\n bRequiresFarZQuadClear = false;\n break;\n\n case 1: \/\/ RHICmdList.Clear\n bRequiresRHIClear = true;\n bRequiresFarZQuadClear = false;\n break;\n\n case 2: \/\/ Clear using far-z quad\n bRequiresFarZQuadClear = true;\n bRequiresRHIClear = false;\n break;\n }\n}\n<\/code><\/pre>\n\u6e05\u7a7aGBuffer\u7684\u65b9\u5f0f\u7531\u63a7\u5236\u53f0\u6307\u4ee4\u663e\u793a\u6307\u5b9a\uff0c\u6e05\u7a7a\u65b9\u5f0f\u6709\u4e09\u79cd\uff0c\u9ed8\u8ba4RHIClear<\/strong>\uff1a<\/p>\n\n- NoClear\n
\n- \u76ee\u7684\uff1a\u4e0d\u6e05\u9664Clear<\/li>\n
- \u4f18\u70b9\uff1a\u7701\u5e26\u5bbd<\/li>\n
- \u7f3a\u70b9\uff1a\u53ef\u80fd\u6b8b\u7559\u5783\u573e\u6570\u636e<\/li>\n<\/ul>\n<\/li>\n
- RHIClear\n
\n- \u76ee\u7684\uff1a\u6574\u5c4f\u786c\u4ef6 Clear<\/li>\n
- \u4f18\u70b9\uff1a\u5b9e\u73b0\u7b80\u5355\u3001\u884c\u4e3a\u7a33\u5b9a<\/li>\n
- \u7f3a\u70b9\uff1a\u6574\u5c4f\u5e26\u5bbd<\/li>\n<\/ul>\n<\/li>\n
- QuadAtMaxZ\n
\n- \u76ee\u7684\uff1a\u5728Clear\u7684\u60c5\u51b5\u4e0b\uff0c\u8282\u7701\u5e26\u5bbd<\/li>\n
- \u4f18\u70b9\uff1a\u4f7f\u7528Prepass\u6df1\u5ea6\u505a\u6df1\u5ea6\u6d4b\u8bd5\n
\n- \u753b\u4e00\u4e2a\u5168\u5c4f Quad\uff0c\u6df1\u5ea6\u8bbe\u5728 MaxZ<\/li>\n
- \u2022 \u6df1\u5ea6\u6d4b\u8bd5 CF_GreaterEqual\uff08Reversed-Z\uff09<\/li>\n
- \u2022 \u53ea\u6709\u4ecd\u4e3a MaxZ \u7684\u50cf\u7d20\u901a\u8fc7\u6d4b\u8bd5\u5e76\u88ab\u5199\u4e0a\u80cc\u666f\u8272<\/li>\n
- \u2022 \u5df2\u6709\u51e0\u4f55\u7684\u50cf\u7d20\u6df1\u5ea6\u66f4\u8fd1 \u2192 \u4e0d\u4f1a\u88ab\u8986\u76d6<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
if (ViewFamily.EngineShowFlags.Wireframe || ViewFamily.EngineShowFlags.ShaderComplexity || ViewFamily.EngineShowFlags.StationaryLightOverlap)\n{\n bRequiresRHIClear = true;\n bRequiresFarZQuadClear = false;\n}\n<\/code><\/pre>\n\u8fd9\u91cc\u4f9d\u7136\u5728\u5224\u65ad\u5982\u4f55Clear RT\uff0c\u5224\u65adView\u89c6\u53e3\u76ee\u524d\u662f\u4e0d\u662f\u7ebf\u6846\u6a21\u5f0f\u3001shader\u590d\u6742\u5ea6\u6a21\u5f0f\u3001\u9759\u6b62\u5149\u4ea4\u9519\u6d4b\u8bd5\u6a21\u5f0f\uff0c\u662f\u5219\u542f\u7528RHIClear\uff0c\u7981\u7528QuadAtMaxZ\uff0c\u4e5f\u5c31\u662f\u8bf4\u8fd9\u4e09\u79cd\u6a21\u5f0f\u4e0d\u80fd\u8d70prepass\u6df1\u5ea6\u6d4b\u8bd5\u4f18\u5316<\/p>\n
\u83b7\u53d6GBuffer RenderTargets<\/h3>\nTStaticArray<FTextureRenderTargetBinding, MaxSimultaneousRenderTargets> BasePassTextures;\nuint32 BasePassTextureCount = SceneTextures.GetGBufferRenderTargets(BasePassTextures);\n<\/code><\/pre>\n\u5148\u83b7\u53d6Base Pass\u7528\u5230\u7684RenderTargets<\/p>\n
TArrayView<FTextureRenderTargetBinding> BasePassTexturesView = MakeArrayView(BasePassTextures.GetData(), BasePassTextureCount);\n<\/code><\/pre>\n\u7531\u4e8eBasePassTextures\u521d\u59cb\u5316\u4e00\u6b21\u6027\u5206\u914d\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u7ec4\uff0cRenderTargets\u53ef\u80fd\u4e0d\u4f1a\u5b8c\u5168\u5360\u6ee1\uff0c\u8fd9\u610f\u5473\u7740\u4f1a\u5269\u4e0b\u7a7a\u4f4d\uff0c\u4e0d\u80fd\u628a\u5e26\u6709\u7a7a\u4f4d\u7684BasePassTextures\u4f20\u7ed9\u5176\u4ed6\u5bf9\u8c61\uff0c\u56e0\u6b64MakeArrayView\u6267\u884c\u4e86\u53bb\u7a7a<\/p>\n
FRDGTextureRef BasePassDepthTexture = SceneTextures.Depth.Target;\nFLinearColor SceneColorClearValue = FLinearColor::Black;\n<\/code><\/pre>\n\u83b7\u53d6Depth Texture\uff0c\u4ee5\u53caClear Color<\/p>\n
Clear GBuffer Render Targets<\/h3>\n\n- \u51b3\u5b9aClear Color\n
if (ViewFamily.EngineShowFlags.ShaderComplexity || ViewFamily.EngineShowFlags.StationaryLightOverlap)\n{\n SceneColorClearValue = FLinearColor(0, 0, 0, kSceneColorClearAlpha);\n}\nelse\n{\n SceneColorClearValue = FLinearColor(InViews[0].BackgroundColor.R, InViews[0].BackgroundColor.G, InViews[0].BackgroundColor.B, kSceneColorClearAlpha);\n}\n<\/code><\/pre>\nDebug\u6a21\u5f0fClear Color\u4e3a\u9ed1\uff0c\u6b63\u5e38\u60c5\u51b5Clear Color\u4e3a\u80cc\u666f\u8272<\/p>\n<\/li>\n
- \n
\u51b3\u5b9aclear\u65b9\u5f0f<\/p>\n
ERenderTargetLoadAction ColorLoadAction = ERenderTargetLoadAction::ELoad;\n\nif (SceneTextures.Color.Target->Desc.ClearValue.GetClearColor() == SceneColorClearValue)\n{\n ColorLoadAction = ERenderTargetLoadAction::EClear;\n}\nelse\n{\n ColorLoadAction = ERenderTargetLoadAction::ENoAction;\n}\n<\/code><\/pre>\n\n- EClear\uff1aGPU\u786c\u4ef6 Clear\uff0cclear\u6210ClearColor<\/li>\n
- ENoAction\uff1a\u4e0d Load\u3001\u4e5f\u4e0d Clear<\/li>\n
- ELoad\uff1a\u4fdd\u7559\u5df2\u6709\u5185\u5bb9<\/li>\n<\/ul>\n<\/li>\n
- Pass Parameter\u7ed1\u5b9aRenderTargets\n
auto* PassParameters = GraphBuilder.AllocParameters<FRenderTargetParameters>();\nPassParameters->RenderTargets = GetRenderTargetBindings(ColorLoadAction, BasePassTexturesView);\n<\/code><\/pre>\n<\/li>\n- \u5904\u7406GBufferD\n
const FGBufferBindings& GBufferBindings = SceneTextures.Config.GBufferBindings[GBL_Default];\nif (!CVarClearGBufferDBeforeBasePass.GetValueOnRenderThread() && GBufferBindings.GBufferD.Index > 0 && GBufferBindings.GBufferD.Index < (int32)BasePassTextureCount)\n{\n PassParameters->RenderTargets[GBufferBindings.GBufferD.Index].SetLoadAction(ERenderTargetLoadAction::ENoAction);\n}\n<\/code><\/pre>\n\u82e5\u660e\u786e\u6307\u51faBase Pass\u6267\u884c\u524d\uff0c\u4e0dclear GBufferD\uff0cGBufferD\u8bbe\u7f6e\u4e0dclear \u4e0dload<\/p>\n
GBufferD \u5e38\u5b58 PerObject Data \/ Custom Data\uff0c\u6709\u65f6 Base Pass \u4f1a\u5b8c\u6574\u8986\u76d6\uff0c\u63d0\u524d\u6e05\u662f\u6d6a\u8d39<\/p>\n<\/li>\n
- \n
\u5f53\u4e0dClear\uff0c\u4e5f\u4e0dLoad<\/p>\n
GraphBuilder.AddPass(RDG_EVENT_NAME(\"GBufferClear\"), PassParameters, ERDGPassFlags::Raster,\n[PassParameters, ColorLoadAction, SceneColorClearValue](FRDGAsyncTask, FRHICommandList& RHICmdList)\n{\nconst FRenderTargetBindingSlots& RenderTargets = PassParameters->RenderTargets;\n FLinearColor ClearColors[MaxSimultaneousRenderTargets];\n FRHITexture* Textures[MaxSimultaneousRenderTargets];\n int32 TextureIndex = 0;\n\n RenderTargets.Enumerate([&](const FRenderTargetBinding& RenderTarget)\n {\n FRHITexture* TextureRHI = RenderTarget.GetTexture()->GetRHI();\n ClearColors[TextureIndex] = TextureIndex == 0 ? SceneColorClearValue : TextureRHI->GetClearColor();\n Textures[TextureIndex] = TextureRHI;\n ++TextureIndex;\n });\n\n \/\/ Clear color only; depth-stencil is fast cleared.\n DrawClearQuadMRT(RHICmdList, true, TextureIndex, ClearColors, false, 0, false, 0);\n});\n<\/code><\/pre>\n\u5f53\u786c\u4ef6\u4e0d\u505a\u4efb\u4f55\u5904\u7406\u65f6\uff0c\u624d\u6267\u884cShader Clear<\/p>\n
Scene Color Clear \u4e3aSceneColorClearValue\uff0c\u5176\u4ed6\u7684Clear\u4e3a\u5404\u81ea\u7eb9\u7406\u6ce8\u518c\u7684 GetClearColor()<\/p>\n<\/li>\n<\/ul>\n
RenderBasePass<\/h3>\nLoad GBuffer<\/h4>\nFRenderTargetBindingSlots BasePassRenderTargets = GetRenderTargetBindings(ERenderTargetLoadAction::ELoad, BasePassTexturesView);\nBasePassRenderTargets.DepthStencil = FDepthStencilBinding(BasePassDepthTexture, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil);\n\nBasePassRenderTargets.DepthStencil = FDepthStencilBinding(BasePassDepthTexture, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil);\n\nconst bool bAllowReadOnlyDepthBasePass = bIsEarlyDepthComplete\n && !ViewFamily.EngineShowFlags.ShaderComplexity\n && !ViewFamily.UseDebugViewPS()\n && !ViewFamily.EngineShowFlags.Wireframe\n && !ViewFamily.EngineShowFlags.LightMapDensity;\n\nconst FExclusiveDepthStencil::Type BasePassDepthStencilAccess =\n bAllowReadOnlyDepthBasePass\n ? FExclusiveDepthStencil::DepthRead_StencilWrite\n : FExclusiveDepthStencil::DepthWrite_StencilWrite;\n<\/code><\/pre>\n\u53ea\u6709\u662f\u975eDebug\u6a21\u5f0f\u4e14prepass\u6267\u884c\u4e86\uff0c\u624d\u8d70DepthRead_StencilWrite\uff0c\u5426\u5219DepthWrite_StencilWrite<\/p>\n
RenderNaniteBasePass<\/h4>\nauto RenderNaniteBasePass = [&](FViewInfo& View, int32 ViewIndex)\n{\n Nanite::FRasterResults& RasterResults = NaniteRasterResults[ViewIndex];\n\n Nanite::DispatchBasePass(\n GraphBuilder,\n NaniteBasePassShadingCommands,\n Renderer,\n SceneTextures,\n BasePassRenderTargets,\n DBufferTextures,\n *Scene,\n View,\n uint32(ViewIndex),\n RasterResults\n );\n}\n<\/code><\/pre>\n\u7531\u4e8eNanite\u8fd8\u672a\u63a5\u89e6\uff0c\u8fd9\u91cc\u5c31\u4e0d\u73ed\u95e8\u5f04\u65a7\u4e86\uff0c\u53ea\u9700\u77e5\u9053RenderNaniteBasePass\u6e32\u67d3\u7684\u662fNanite\u7269\u4f53\u7684GBuffer<\/p>\n
Render Base Pass<\/h4>\n
\u4f9d\u7136\u904d\u5386View\u6e32\u67d3Base Pass<\/p>\n
\n- \u5224\u65adLumen\u662f\u5426\u542f\u7528\n
const bool bLumenGIEnabled = Renderer.GetViewPipelineState(View).DiffuseIndirectMethod == EDiffuseIndirectMethod::Lumen;\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u8ba1\u7b97\u6e32\u67d3\u72b6\u6001<\/h5>\nFMeshPassProcessorRenderState DrawRenderState;\n\nSetupBasePassState(BasePassDepthStencilAccess, ViewFamily.EngineShowFlags.ShaderComplexity, DrawRenderState);\n<\/code><\/pre>\nvoid SetupBasePassState(FExclusiveDepthStencil::Type BasePassDepthStencilAccess, const bool bShaderComplexity, FMeshPassProcessorRenderState& DrawRenderState)\n{\n DrawRenderState.SetDepthStencilAccess(BasePassDepthStencilAccess);\n\n if (bShaderComplexity)\n {\n \/\/ Additive blending when shader complexity viewmode is enabled.\n DrawRenderState.SetBlendState(TStaticBlendState<CW_RGBA, BO_Add, BF_One, BF_One, BO_Add, BF_Zero, BF_One>::GetRHI());\n \/\/ Disable depth writes as we have a full depth prepass.\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_DepthNearOrEqual>::GetRHI());\n }\n else\n {\n \/\/ Opaque blending for all G buffer targets, depth tests and writes.\n static const auto CVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT(\"r.BasePassOutputsVelocityDebug\"));\n if (CVar && CVar->GetValueOnRenderThread() == 2)\n {\n DrawRenderState.SetBlendState(TStaticBlendStateWriteMask<CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_NONE>::GetRHI());\n }\n else\n {\n DrawRenderState.SetBlendState(TStaticBlendStateWriteMask<CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA>::GetRHI());\n }\n\n if (DrawRenderState.GetDepthStencilAccess() & FExclusiveDepthStencil::DepthWrite)\n {\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<true, CF_DepthNearOrEqual>::GetRHI());\n }\n else\n {\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_DepthNearOrEqual>::GetRHI());\n }\n }\n}\n<\/code><\/pre>\n\n- DrawRenderState\u8bbe\u7f6e\u6df1\u5ea6\u6a21\u677f\u6d4b\u8bd5<\/li>\n
- \u5224\u65ad\u662f\u5426\u662fShaderComplexity Debug\u6a21\u5f0f\n
\n- \u662f\uff1a\u8bbe\u7f6e\u9002\u5408ShaderComplexity\u7684\u6df1\u5ea6\u6a21\u677f\u6d4b\u8bd5(\u4e0d\u5199\u6df1\u5ea6)\u3001Blend\u6d4b\u8bd5(Additive)<\/li>\n
- \u5426\uff1a\u8bbe\u7f6eopaque blend<\/li>\n
- \u5224\u65ad\u662f\u5426Debug Velocity\n
\n- \u662f\uff1aGBuffer \u524d6\u4e2aRT\u7684Color \u56db\u901a\u9053\u90fd\u5199\uff0c\u7b2c\u4e03\u4e2aRT\u4e0d\u5199Color\uff0c\u7b2c\u516b\u4e2a\u9ed8\u8ba4Color \u56db\u901a\u9053\u90fd\u5199<\/li>\n
- \u5426\uff1aGBuffer 8\u4e2aRT\u7684Color \u56db\u901a\u9053\u90fd\u5199<\/li>\n<\/ul>\n<\/li>\n
- \u5224\u65ad\u662f\u5426Depth Write\n
\n- \u662f\uff1a\u542f\u7528\u6df1\u5ea6\u5199\u5165\uff0c\u6df1\u5ea6\u6d4b\u8bd5\u4e3a\u6df1\u5ea6\u503c\u5c0f\u4e8e\u7b49\u4e8e<\/li>\n
- \u5426\uff1a\u7981\u7528\u6df1\u5ea6\u5199\u5165\uff0c\u6df1\u5ea6\u6d4b\u8bd5\u4e3a\u6df1\u5ea6\u503c\u5c0f\u4e8e\u7b49\u4e8e<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
\u7ed1\u5b9aPass Parameter<\/h5>\nBEGIN_SHADER_PARAMETER_STRUCT(FOpaqueBasePassParameters, )\n SHADER_PARAMETER_STRUCT_INCLUDE(FViewShaderParameters, View)\n SHADER_PARAMETER_STRUCT_REF(FReflectionCaptureShaderData, ReflectionCapture)\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FOpaqueBasePassUniformParameters, BasePass)\n SHADER_PARAMETER_STRUCT_INCLUDE(FInstanceCullingDrawParams, InstanceCullingDrawParams)\n RENDER_TARGET_BINDING_SLOTS()\nEND_SHADER_PARAMETER_STRUCT()\n\nBEGIN_SHADER_PARAMETER_STRUCT(FViewShaderParameters, )\n SHADER_PARAMETER_STRUCT_REF(FViewUniformShaderParameters, View)\n SHADER_PARAMETER_STRUCT_REF(FInstancedViewUniformShaderParameters, InstancedView)\nEND_SHADER_PARAMETER_STRUCT()\n\nBEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FReflectionCaptureShaderData,)\n SHADER_PARAMETER_ARRAY(FVector4f,PositionHighAndRadius,[GMaxNumReflectionCaptures])\n \/\/ W is unused\n SHADER_PARAMETER_ARRAY(FVector4f,PositionLow,[GMaxNumReflectionCaptures])\n \/\/ R is brightness, G is array index, B is shape\n SHADER_PARAMETER_ARRAY(FVector4f,CaptureProperties,[GMaxNumReflectionCaptures])\n SHADER_PARAMETER_ARRAY(FVector4f,CaptureOffsetAndAverageBrightness,[GMaxNumReflectionCaptures])\n \/\/ Stores the box transform for a box shape, other data is packed for other shapes\n SHADER_PARAMETER_ARRAY(FMatrix44f,BoxTransform,[GMaxNumReflectionCaptures])\n SHADER_PARAMETER_ARRAY(FVector4f,BoxScales,[GMaxNumReflectionCaptures])\nEND_GLOBAL_SHADER_PARAMETER_STRUCT()\n\nBEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FOpaqueBasePassUniformParameters,)\n SHADER_PARAMETER_STRUCT(FSharedBasePassUniformParameters, Shared)\n SHADER_PARAMETER_STRUCT(FSubstrateBasePassUniformParameters, Substrate)\n \/\/ Forward shading \n SHADER_PARAMETER(int32, UseForwardScreenSpaceShadowMask)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, ForwardScreenSpaceShadowMaskTexture)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, IndirectOcclusionTexture)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, ResolvedSceneDepthTexture)\n \/\/ DBuffer decals\n SHADER_PARAMETER_STRUCT_INCLUDE(FDBufferParameters, DBuffer)\n \/\/ Misc\n SHADER_PARAMETER_TEXTURE(Texture2D, PreIntegratedGFTexture)\n SHADER_PARAMETER_SAMPLER(SamplerState, PreIntegratedGFSampler)\n SHADER_PARAMETER(int32, Is24BitUnormDepthStencil)\n SHADER_PARAMETER_RDG_BUFFER_SRV(StructuredBuffer<float4>, EyeAdaptationBuffer)\nEND_GLOBAL_SHADER_PARAMETER_STRUCT()\n\nBEGIN_SHADER_PARAMETER_STRUCT(FInstanceCullingDrawParams, )\n RDG_BUFFER_ACCESS(DrawIndirectArgsBuffer, ERHIAccess::IndirectArgs)\n RDG_BUFFER_ACCESS(InstanceIdOffsetBuffer, ERHIAccess::VertexOrIndexBuffer)\n SHADER_PARAMETER(uint32, InstanceDataByteOffset) \/\/ offset into per-instance buffer\n SHADER_PARAMETER(uint32, IndirectArgsByteOffset) \/\/ offset into indirect args buffer\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FInstanceCullingGlobalUniforms, InstanceCulling) \n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FSceneUniformParameters, Scene)\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FBatchedPrimitiveParameters, BatchedPrimitive)\nEND_SHADER_PARAMETER_STRUCT()\n<\/code><\/pre>\nPass Parameter\u5305\u542bView\u3001ReflectionCaptureData\u3001InstanceCulling\u3001OpaqueBasePassUniform<\/p>\n
FOpaqueBasePassParameters* PassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();\nPassParameters->View = View.GetShaderParameters();\nPassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;\nPassParameters->BasePass = CreateOpaqueBasePassUniformBuffer(GraphBuilder, View, ViewIndex, ForwardBasePassTextures, DBufferTextures, bLumenGIEnabled);\nPassParameters->RenderTargets = BasePassRenderTargets;\nPassParameters->RenderTargets.ShadingRateTexture = GVRSImageManager.GetVariableRateShadingImage(GraphBuilder, View, FVariableRateShadingImageManager::EVRSPassType::BasePass);\n\n<\/code><\/pre>\nDispatch Base & Sky Pass<\/h5>\n\n- \u5148\u5224\u65adView\u662f\u5426\u53ef\u4ee5\u6267\u884cBase Pass\n
const bool bShouldRenderView = View.ShouldRenderView();\n\nbool ShouldRenderView() const \n{\n if (bHasNoVisiblePrimitive)\n {\n return false;\n }\n else if (!bIsSinglePassStereo)\n {\n return true;\n }\n else if (bIsSinglePassStereo && !IStereoRendering::IsASecondaryPass(StereoPass))\n {\n return true;\n }\n else\n {\n return false;\n }\n}\n<\/code><\/pre>\n\u82e5\u6ca1\u6709\u53ef\u89c1\u56fe\u5143\u4e0d\u753b<\/p>\n<\/li>\n
- \n
\u82e5View\u53ef\u4ee5\u6267\u884cBase Pass\uff0c\u4e14MeshDrawCommandPasses[EMeshPass::BasePass]\u4e0d\u4e3anull\uff0cDispatch Base Pass<\/p>\n
if (auto* Pass = View.ParallelMeshDrawCommandPasses[EMeshPass::BasePass]; Pass && bShouldRenderView)\n{\n Pass->BuildRenderingCommands(GraphBuilder, Scene->GPUScene, PassParameters->InstanceCullingDrawParams);\n\n GraphBuilder.AddDispatchPass(\n RDG_EVENT_NAME(\"BasePassParallel\"),\n PassParameters,\n ERDGPassFlags::Raster,\n [Pass, PassParameters](FRDGDispatchPassBuilder& DispatchPassBuilder)\n {\n Pass->Dispatch(DispatchPassBuilder, &PassParameters->InstanceCullingDrawParams);\n });\n}\n<\/code><\/pre>\n<\/li>\n- Dispatch Nanite Base Pass\n
const bool bShouldRenderViewForNanite = bNaniteEnabled\n && !View.bHasNoVisiblePrimitive\n && (!bDrawSceneViewsInOneNanitePass || ViewIndex == 0); \nif (bShouldRenderViewForNanite)\n{\n check(Renderer.ShouldRenderPrePass());\n\n RenderNaniteBasePass(View, ViewIndex);\n}\n<\/code><\/pre>\n<\/li>\n- Dispatch Sky Atmosphere\n
if (auto* Pass = View.ParallelMeshDrawCommandPasses[EMeshPass::SkyPass]; Pass && bShouldRenderView && View.Family->EngineShowFlags.Atmosphere)\n{\n FOpaqueBasePassParameters* SkyPassPassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();\n SkyPassPassParameters->BasePass = PassParameters->BasePass;\n SkyPassPassParameters->RenderTargets = BasePassRenderTargets;\n SkyPassPassParameters->View = View.GetShaderParameters();\n SkyPassPassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;\n\n \/\/ Remove all but the SceneColor\n for (uint32 i = 1; i < MaxSimultaneousRenderTargets; ++i)\n {\n SkyPassPassParameters->RenderTargets[i] = FRenderTargetBinding();\n }\n\n Pass->BuildRenderingCommands(GraphBuilder, Scene->GPUScene, SkyPassPassParameters->InstanceCullingDrawParams);\n\n GraphBuilder.AddDispatchPass(\n RDG_EVENT_NAME(\"SkyPassParallel\"),\n SkyPassPassParameters,\n ERDGPassFlags::Raster,\n [Pass, SkyPassPassParameters](FRDGDispatchPassBuilder& DispatchPassBuilder)\n {\n Pass->Dispatch(DispatchPassBuilder, &SkyPassPassParameters->InstanceCullingDrawParams);\n });\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u7ed1\u5b9a\u6e32\u67d3\u72b6\u6001<\/h4>\n
\u4f9d\u7136Process\u83b7\u53d6\u7ed1\u5b9aShader\u3001\u8bbe\u7f6eDepthStencilc\u6d4b\u8bd5\u3001\u6392\u5e8f\uff0c\u6d41\u7a0b\u4e0e\u4e00\u822c\u7684Pass\u7c7b\u4f3c\uff0c\u4e0d\u518d\u8d58\u8ff0\uff0c\u8fd9\u91cc\u53ea\u63d0\u4e24\u4e2a\u989d\u5916\u7684\u64cd\u4f5c<\/p>\n
\n- \u8bbe\u7f6eDecal Stencil Ref\n
if (bEnableReceiveDecalOutput)\n{\nuint8 StencilValue = 0;\nStencilValue = \n GET_STENCIL_BIT_MASK(RECEIVE_DECAL, PrimitiveSceneProxy ? !!PrimitiveSceneProxy->ReceivesDecals() : 0x00)\n | GET_STENCIL_BIT_MASK(RAY_TRACING_REPRESENTATION, bHasRayTracingRepresentation)\n | STENCIL_LIGHTING_CHANNELS_MASK(PrimitiveSceneProxy ? PrimitiveSceneProxy->GetLightingChannelStencilValue() : 0x00);\n DrawRenderState.SetStencilRef(StencilValue);\n}\n<\/code><\/pre>\n\u7528\u4e8e\u6807\u8bb0Decal \u6e32\u67d3\u533a\u57df<\/p>\n<\/li>\n
- \n
\u82e5\u6750\u8d28\u7c7b\u578b\u662fTranslucent\uff0c\u800c\u975eopaque\uff0c\u5219\u8bbe\u7f6e\u9002\u5408Translucent\u7684\u6e32\u67d3\u72b6\u6001<\/p>\n
if (bTranslucentBasePass)\n{\n SetTranslucentRenderState(DrawRenderState, MaterialResource, GShaderPlatformForFeatureLevel[FeatureLevel], TranslucencyPassType);\n}\n<\/code><\/pre>\n<\/li>\n- \u7ed1\u5b9a\u7684Shader\n
\n- VS Shader<\/li>\n<\/ul>\n
#define IMPLEMENT_BASEPASS_VERTEXSHADER_TYPE(LightMapPolicyType,LightMapPolicyName) \\\n typedef TBasePassVS< LightMapPolicyType > TBasePassVS##LightMapPolicyName ; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassVS##LightMapPolicyName,TEXT(\"\/Engine\/Private\/BasePassVertexShader.usf\"),TEXT(\"Main\"),SF_Vertex);\n\n<\/code><\/pre>\n\n- PS Shader<\/li>\n<\/ul>\n
#define IMPLEMENT_BASEPASS_PIXELSHADER_TYPE(LightMapPolicyType,LightMapPolicyName,bEnableSkyLight,SkyLightName,GBufferLayout,LayoutName) \\\n typedef TBasePassPS<LightMapPolicyType, bEnableSkyLight, GBufferLayout> TBasePassPS##LightMapPolicyName##SkyLightName##LayoutName; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassPS##LightMapPolicyName##SkyLightName##LayoutName,TEXT(\"\/Engine\/Private\/BasePassPixelShader.usf\"),TEXT(\"MainPS\"),SF_Pixel);\n\n#define IMPLEMENT_BASEPASS_COMPUTESHADER_TYPE(LightMapPolicyType,LightMapPolicyName,bEnableSkyLight,SkyLightName,bVoxel,VoxelName) \\\n typedef TBasePassCS<LightMapPolicyType, bEnableSkyLight, bVoxel, SF_Compute> TBasePassCS##LightMapPolicyName##SkyLightName##VoxelName; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassCS##LightMapPolicyName##SkyLightName##VoxelName,TEXT(\"\/Engine\/Private\/BasePassPixelShader.usf\"),TEXT(\"MainCS\"),SF_Compute);\n\n<\/code><\/pre>\n<\/li>\n<\/ul>\nGPU\u7aef<\/h2>\n
\n
\u5b9e\u73b0<\/p>\n
Info.Targets[0].Init(GBT_Unorm_11_11_10, TEXT(\"Lighting\"), false, true, true, true);\nInfo.Targets[1].Init(NormalGBufferFormatTarget,TEXT(\"GBufferA\"), false, true, true, true);\nInfo.Targets[2].Init(DiffuseAndSpecularGBufferFormat, TEXT(\"GBufferB\"), false, true, true, true);\n\nconst bool bLegacyAlbedoSrgb = true;\nInfo.Targets[3].Init(DiffuseAndSpecularGBufferFormat, TEXT(\"GBufferC\"), bLegacyAlbedoSrgb && !bHighPrecisionGBuffers, true, true, true);\n\n\/\/ This code should match TBasePassPS\nif (Params.bHasVelocity == 0 && Params.bHasTangent == 0)\n{\n TargetGBufferD = 4;\n Info.Targets[4].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 5;\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, true);\n }\n}\nelse if (Params.bHasVelocity)\n{\n TargetVelocity = 4;\n TargetGBufferD = 5;\n\n \/\/ note the false for use extra flags for velocity, not quite sure of all the ramifications, but this keeps it consistent with previous usage\n Info.Targets[4].Init(Params.bUsesVelocityDepth ? GBT_Unorm_16_16_16_16 : (IsAndroidOpenGLESPlatform(Params.ShaderPlatform) ? GBT_Float_16_16 : GBT_Unorm_16_16), TEXT(\"Velocity\"), false, true, true, false);\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 6;\n Info.Targets[6].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, false);\n }\n}\nelse if (Params.bHasTangent)\n{\n TargetGBufferF = 4;\n TargetGBufferD = 5;\n Info.Targets[4].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferF\"), false, true, true, true);\n Info.Targets[5].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferD\"), false, true, true, true);\n if (Params.bHasPrecShadowFactor)\n {\n TargetGBufferE = 6;\n Info.Targets[6].Init(GBT_Unorm_8_8_8_8, TEXT(\"GBufferE\"), false, true, true, true);\n }\n}\nelse\n{\n \/\/ should never hit this path\n check(0);\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u6e05\u7a7aGBuffer<\/h3>\nstatic const auto ClearMethodCVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT(\"r.ClearSceneMethod\"));\n\nbool bRequiresRHIClear = true;\nbool bRequiresFarZQuadClear = false;\n\nif (ClearMethodCVar)\n{\n int32 ClearMethod = ClearMethodCVar->GetValueOnRenderThread();\n\n if (ClearMethod == 0 && !ViewFamily.EngineShowFlags.Game)\n {\n \/\/ Do not clear the scene only if the view family is in game mode.\n ClearMethod = 1;\n }\n\n switch (ClearMethod)\n {\n case 0: \/\/ No clear\n bRequiresRHIClear = false;\n bRequiresFarZQuadClear = false;\n break;\n\n case 1: \/\/ RHICmdList.Clear\n bRequiresRHIClear = true;\n bRequiresFarZQuadClear = false;\n break;\n\n case 2: \/\/ Clear using far-z quad\n bRequiresFarZQuadClear = true;\n bRequiresRHIClear = false;\n break;\n }\n}\n<\/code><\/pre>\n\u6e05\u7a7aGBuffer\u7684\u65b9\u5f0f\u7531\u63a7\u5236\u53f0\u6307\u4ee4\u663e\u793a\u6307\u5b9a\uff0c\u6e05\u7a7a\u65b9\u5f0f\u6709\u4e09\u79cd\uff0c\u9ed8\u8ba4RHIClear<\/strong>\uff1a<\/p>\n\n- NoClear\n
\n- \u76ee\u7684\uff1a\u4e0d\u6e05\u9664Clear<\/li>\n
- \u4f18\u70b9\uff1a\u7701\u5e26\u5bbd<\/li>\n
- \u7f3a\u70b9\uff1a\u53ef\u80fd\u6b8b\u7559\u5783\u573e\u6570\u636e<\/li>\n<\/ul>\n<\/li>\n
- RHIClear\n
\n- \u76ee\u7684\uff1a\u6574\u5c4f\u786c\u4ef6 Clear<\/li>\n
- \u4f18\u70b9\uff1a\u5b9e\u73b0\u7b80\u5355\u3001\u884c\u4e3a\u7a33\u5b9a<\/li>\n
- \u7f3a\u70b9\uff1a\u6574\u5c4f\u5e26\u5bbd<\/li>\n<\/ul>\n<\/li>\n
- QuadAtMaxZ\n
\n- \u76ee\u7684\uff1a\u5728Clear\u7684\u60c5\u51b5\u4e0b\uff0c\u8282\u7701\u5e26\u5bbd<\/li>\n
- \u4f18\u70b9\uff1a\u4f7f\u7528Prepass\u6df1\u5ea6\u505a\u6df1\u5ea6\u6d4b\u8bd5\n
\n- \u753b\u4e00\u4e2a\u5168\u5c4f Quad\uff0c\u6df1\u5ea6\u8bbe\u5728 MaxZ<\/li>\n
- \u2022 \u6df1\u5ea6\u6d4b\u8bd5 CF_GreaterEqual\uff08Reversed-Z\uff09<\/li>\n
- \u2022 \u53ea\u6709\u4ecd\u4e3a MaxZ \u7684\u50cf\u7d20\u901a\u8fc7\u6d4b\u8bd5\u5e76\u88ab\u5199\u4e0a\u80cc\u666f\u8272<\/li>\n
- \u2022 \u5df2\u6709\u51e0\u4f55\u7684\u50cf\u7d20\u6df1\u5ea6\u66f4\u8fd1 \u2192 \u4e0d\u4f1a\u88ab\u8986\u76d6<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
if (ViewFamily.EngineShowFlags.Wireframe || ViewFamily.EngineShowFlags.ShaderComplexity || ViewFamily.EngineShowFlags.StationaryLightOverlap)\n{\n bRequiresRHIClear = true;\n bRequiresFarZQuadClear = false;\n}\n<\/code><\/pre>\n\u8fd9\u91cc\u4f9d\u7136\u5728\u5224\u65ad\u5982\u4f55Clear RT\uff0c\u5224\u65adView\u89c6\u53e3\u76ee\u524d\u662f\u4e0d\u662f\u7ebf\u6846\u6a21\u5f0f\u3001shader\u590d\u6742\u5ea6\u6a21\u5f0f\u3001\u9759\u6b62\u5149\u4ea4\u9519\u6d4b\u8bd5\u6a21\u5f0f\uff0c\u662f\u5219\u542f\u7528RHIClear\uff0c\u7981\u7528QuadAtMaxZ\uff0c\u4e5f\u5c31\u662f\u8bf4\u8fd9\u4e09\u79cd\u6a21\u5f0f\u4e0d\u80fd\u8d70prepass\u6df1\u5ea6\u6d4b\u8bd5\u4f18\u5316<\/p>\n
\u83b7\u53d6GBuffer RenderTargets<\/h3>\nTStaticArray<FTextureRenderTargetBinding, MaxSimultaneousRenderTargets> BasePassTextures;\nuint32 BasePassTextureCount = SceneTextures.GetGBufferRenderTargets(BasePassTextures);\n<\/code><\/pre>\n\u5148\u83b7\u53d6Base Pass\u7528\u5230\u7684RenderTargets<\/p>\n
TArrayView<FTextureRenderTargetBinding> BasePassTexturesView = MakeArrayView(BasePassTextures.GetData(), BasePassTextureCount);\n<\/code><\/pre>\n\u7531\u4e8eBasePassTextures\u521d\u59cb\u5316\u4e00\u6b21\u6027\u5206\u914d\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u7ec4\uff0cRenderTargets\u53ef\u80fd\u4e0d\u4f1a\u5b8c\u5168\u5360\u6ee1\uff0c\u8fd9\u610f\u5473\u7740\u4f1a\u5269\u4e0b\u7a7a\u4f4d\uff0c\u4e0d\u80fd\u628a\u5e26\u6709\u7a7a\u4f4d\u7684BasePassTextures\u4f20\u7ed9\u5176\u4ed6\u5bf9\u8c61\uff0c\u56e0\u6b64MakeArrayView\u6267\u884c\u4e86\u53bb\u7a7a<\/p>\n
FRDGTextureRef BasePassDepthTexture = SceneTextures.Depth.Target;\nFLinearColor SceneColorClearValue = FLinearColor::Black;\n<\/code><\/pre>\n\u83b7\u53d6Depth Texture\uff0c\u4ee5\u53caClear Color<\/p>\n
Clear GBuffer Render Targets<\/h3>\n\n- \u51b3\u5b9aClear Color\n
if (ViewFamily.EngineShowFlags.ShaderComplexity || ViewFamily.EngineShowFlags.StationaryLightOverlap)\n{\n SceneColorClearValue = FLinearColor(0, 0, 0, kSceneColorClearAlpha);\n}\nelse\n{\n SceneColorClearValue = FLinearColor(InViews[0].BackgroundColor.R, InViews[0].BackgroundColor.G, InViews[0].BackgroundColor.B, kSceneColorClearAlpha);\n}\n<\/code><\/pre>\nDebug\u6a21\u5f0fClear Color\u4e3a\u9ed1\uff0c\u6b63\u5e38\u60c5\u51b5Clear Color\u4e3a\u80cc\u666f\u8272<\/p>\n<\/li>\n
- \n
\u51b3\u5b9aclear\u65b9\u5f0f<\/p>\n
ERenderTargetLoadAction ColorLoadAction = ERenderTargetLoadAction::ELoad;\n\nif (SceneTextures.Color.Target->Desc.ClearValue.GetClearColor() == SceneColorClearValue)\n{\n ColorLoadAction = ERenderTargetLoadAction::EClear;\n}\nelse\n{\n ColorLoadAction = ERenderTargetLoadAction::ENoAction;\n}\n<\/code><\/pre>\n\n- EClear\uff1aGPU\u786c\u4ef6 Clear\uff0cclear\u6210ClearColor<\/li>\n
- ENoAction\uff1a\u4e0d Load\u3001\u4e5f\u4e0d Clear<\/li>\n
- ELoad\uff1a\u4fdd\u7559\u5df2\u6709\u5185\u5bb9<\/li>\n<\/ul>\n<\/li>\n
- Pass Parameter\u7ed1\u5b9aRenderTargets\n
auto* PassParameters = GraphBuilder.AllocParameters<FRenderTargetParameters>();\nPassParameters->RenderTargets = GetRenderTargetBindings(ColorLoadAction, BasePassTexturesView);\n<\/code><\/pre>\n<\/li>\n- \u5904\u7406GBufferD\n
const FGBufferBindings& GBufferBindings = SceneTextures.Config.GBufferBindings[GBL_Default];\nif (!CVarClearGBufferDBeforeBasePass.GetValueOnRenderThread() && GBufferBindings.GBufferD.Index > 0 && GBufferBindings.GBufferD.Index < (int32)BasePassTextureCount)\n{\n PassParameters->RenderTargets[GBufferBindings.GBufferD.Index].SetLoadAction(ERenderTargetLoadAction::ENoAction);\n}\n<\/code><\/pre>\n\u82e5\u660e\u786e\u6307\u51faBase Pass\u6267\u884c\u524d\uff0c\u4e0dclear GBufferD\uff0cGBufferD\u8bbe\u7f6e\u4e0dclear \u4e0dload<\/p>\n
GBufferD \u5e38\u5b58 PerObject Data \/ Custom Data\uff0c\u6709\u65f6 Base Pass \u4f1a\u5b8c\u6574\u8986\u76d6\uff0c\u63d0\u524d\u6e05\u662f\u6d6a\u8d39<\/p>\n<\/li>\n
- \n
\u5f53\u4e0dClear\uff0c\u4e5f\u4e0dLoad<\/p>\n
GraphBuilder.AddPass(RDG_EVENT_NAME(\"GBufferClear\"), PassParameters, ERDGPassFlags::Raster,\n[PassParameters, ColorLoadAction, SceneColorClearValue](FRDGAsyncTask, FRHICommandList& RHICmdList)\n{\nconst FRenderTargetBindingSlots& RenderTargets = PassParameters->RenderTargets;\n FLinearColor ClearColors[MaxSimultaneousRenderTargets];\n FRHITexture* Textures[MaxSimultaneousRenderTargets];\n int32 TextureIndex = 0;\n\n RenderTargets.Enumerate([&](const FRenderTargetBinding& RenderTarget)\n {\n FRHITexture* TextureRHI = RenderTarget.GetTexture()->GetRHI();\n ClearColors[TextureIndex] = TextureIndex == 0 ? SceneColorClearValue : TextureRHI->GetClearColor();\n Textures[TextureIndex] = TextureRHI;\n ++TextureIndex;\n });\n\n \/\/ Clear color only; depth-stencil is fast cleared.\n DrawClearQuadMRT(RHICmdList, true, TextureIndex, ClearColors, false, 0, false, 0);\n});\n<\/code><\/pre>\n\u5f53\u786c\u4ef6\u4e0d\u505a\u4efb\u4f55\u5904\u7406\u65f6\uff0c\u624d\u6267\u884cShader Clear<\/p>\n
Scene Color Clear \u4e3aSceneColorClearValue\uff0c\u5176\u4ed6\u7684Clear\u4e3a\u5404\u81ea\u7eb9\u7406\u6ce8\u518c\u7684 GetClearColor()<\/p>\n<\/li>\n<\/ul>\n
RenderBasePass<\/h3>\nLoad GBuffer<\/h4>\nFRenderTargetBindingSlots BasePassRenderTargets = GetRenderTargetBindings(ERenderTargetLoadAction::ELoad, BasePassTexturesView);\nBasePassRenderTargets.DepthStencil = FDepthStencilBinding(BasePassDepthTexture, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil);\n\nBasePassRenderTargets.DepthStencil = FDepthStencilBinding(BasePassDepthTexture, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil);\n\nconst bool bAllowReadOnlyDepthBasePass = bIsEarlyDepthComplete\n && !ViewFamily.EngineShowFlags.ShaderComplexity\n && !ViewFamily.UseDebugViewPS()\n && !ViewFamily.EngineShowFlags.Wireframe\n && !ViewFamily.EngineShowFlags.LightMapDensity;\n\nconst FExclusiveDepthStencil::Type BasePassDepthStencilAccess =\n bAllowReadOnlyDepthBasePass\n ? FExclusiveDepthStencil::DepthRead_StencilWrite\n : FExclusiveDepthStencil::DepthWrite_StencilWrite;\n<\/code><\/pre>\n\u53ea\u6709\u662f\u975eDebug\u6a21\u5f0f\u4e14prepass\u6267\u884c\u4e86\uff0c\u624d\u8d70DepthRead_StencilWrite\uff0c\u5426\u5219DepthWrite_StencilWrite<\/p>\n
RenderNaniteBasePass<\/h4>\nauto RenderNaniteBasePass = [&](FViewInfo& View, int32 ViewIndex)\n{\n Nanite::FRasterResults& RasterResults = NaniteRasterResults[ViewIndex];\n\n Nanite::DispatchBasePass(\n GraphBuilder,\n NaniteBasePassShadingCommands,\n Renderer,\n SceneTextures,\n BasePassRenderTargets,\n DBufferTextures,\n *Scene,\n View,\n uint32(ViewIndex),\n RasterResults\n );\n}\n<\/code><\/pre>\n\u7531\u4e8eNanite\u8fd8\u672a\u63a5\u89e6\uff0c\u8fd9\u91cc\u5c31\u4e0d\u73ed\u95e8\u5f04\u65a7\u4e86\uff0c\u53ea\u9700\u77e5\u9053RenderNaniteBasePass\u6e32\u67d3\u7684\u662fNanite\u7269\u4f53\u7684GBuffer<\/p>\n
Render Base Pass<\/h4>\n
\u4f9d\u7136\u904d\u5386View\u6e32\u67d3Base Pass<\/p>\n
\n- \u5224\u65adLumen\u662f\u5426\u542f\u7528\n
const bool bLumenGIEnabled = Renderer.GetViewPipelineState(View).DiffuseIndirectMethod == EDiffuseIndirectMethod::Lumen;\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u8ba1\u7b97\u6e32\u67d3\u72b6\u6001<\/h5>\nFMeshPassProcessorRenderState DrawRenderState;\n\nSetupBasePassState(BasePassDepthStencilAccess, ViewFamily.EngineShowFlags.ShaderComplexity, DrawRenderState);\n<\/code><\/pre>\nvoid SetupBasePassState(FExclusiveDepthStencil::Type BasePassDepthStencilAccess, const bool bShaderComplexity, FMeshPassProcessorRenderState& DrawRenderState)\n{\n DrawRenderState.SetDepthStencilAccess(BasePassDepthStencilAccess);\n\n if (bShaderComplexity)\n {\n \/\/ Additive blending when shader complexity viewmode is enabled.\n DrawRenderState.SetBlendState(TStaticBlendState<CW_RGBA, BO_Add, BF_One, BF_One, BO_Add, BF_Zero, BF_One>::GetRHI());\n \/\/ Disable depth writes as we have a full depth prepass.\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_DepthNearOrEqual>::GetRHI());\n }\n else\n {\n \/\/ Opaque blending for all G buffer targets, depth tests and writes.\n static const auto CVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT(\"r.BasePassOutputsVelocityDebug\"));\n if (CVar && CVar->GetValueOnRenderThread() == 2)\n {\n DrawRenderState.SetBlendState(TStaticBlendStateWriteMask<CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA, CW_NONE>::GetRHI());\n }\n else\n {\n DrawRenderState.SetBlendState(TStaticBlendStateWriteMask<CW_RGBA, CW_RGBA, CW_RGBA, CW_RGBA>::GetRHI());\n }\n\n if (DrawRenderState.GetDepthStencilAccess() & FExclusiveDepthStencil::DepthWrite)\n {\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<true, CF_DepthNearOrEqual>::GetRHI());\n }\n else\n {\n DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_DepthNearOrEqual>::GetRHI());\n }\n }\n}\n<\/code><\/pre>\n\n- DrawRenderState\u8bbe\u7f6e\u6df1\u5ea6\u6a21\u677f\u6d4b\u8bd5<\/li>\n
- \u5224\u65ad\u662f\u5426\u662fShaderComplexity Debug\u6a21\u5f0f\n
\n- \u662f\uff1a\u8bbe\u7f6e\u9002\u5408ShaderComplexity\u7684\u6df1\u5ea6\u6a21\u677f\u6d4b\u8bd5(\u4e0d\u5199\u6df1\u5ea6)\u3001Blend\u6d4b\u8bd5(Additive)<\/li>\n
- \u5426\uff1a\u8bbe\u7f6eopaque blend<\/li>\n
- \u5224\u65ad\u662f\u5426Debug Velocity\n
\n- \u662f\uff1aGBuffer \u524d6\u4e2aRT\u7684Color \u56db\u901a\u9053\u90fd\u5199\uff0c\u7b2c\u4e03\u4e2aRT\u4e0d\u5199Color\uff0c\u7b2c\u516b\u4e2a\u9ed8\u8ba4Color \u56db\u901a\u9053\u90fd\u5199<\/li>\n
- \u5426\uff1aGBuffer 8\u4e2aRT\u7684Color \u56db\u901a\u9053\u90fd\u5199<\/li>\n<\/ul>\n<\/li>\n
- \u5224\u65ad\u662f\u5426Depth Write\n
\n- \u662f\uff1a\u542f\u7528\u6df1\u5ea6\u5199\u5165\uff0c\u6df1\u5ea6\u6d4b\u8bd5\u4e3a\u6df1\u5ea6\u503c\u5c0f\u4e8e\u7b49\u4e8e<\/li>\n
- \u5426\uff1a\u7981\u7528\u6df1\u5ea6\u5199\u5165\uff0c\u6df1\u5ea6\u6d4b\u8bd5\u4e3a\u6df1\u5ea6\u503c\u5c0f\u4e8e\u7b49\u4e8e<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
\u7ed1\u5b9aPass Parameter<\/h5>\nBEGIN_SHADER_PARAMETER_STRUCT(FOpaqueBasePassParameters, )\n SHADER_PARAMETER_STRUCT_INCLUDE(FViewShaderParameters, View)\n SHADER_PARAMETER_STRUCT_REF(FReflectionCaptureShaderData, ReflectionCapture)\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FOpaqueBasePassUniformParameters, BasePass)\n SHADER_PARAMETER_STRUCT_INCLUDE(FInstanceCullingDrawParams, InstanceCullingDrawParams)\n RENDER_TARGET_BINDING_SLOTS()\nEND_SHADER_PARAMETER_STRUCT()\n\nBEGIN_SHADER_PARAMETER_STRUCT(FViewShaderParameters, )\n SHADER_PARAMETER_STRUCT_REF(FViewUniformShaderParameters, View)\n SHADER_PARAMETER_STRUCT_REF(FInstancedViewUniformShaderParameters, InstancedView)\nEND_SHADER_PARAMETER_STRUCT()\n\nBEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FReflectionCaptureShaderData,)\n SHADER_PARAMETER_ARRAY(FVector4f,PositionHighAndRadius,[GMaxNumReflectionCaptures])\n \/\/ W is unused\n SHADER_PARAMETER_ARRAY(FVector4f,PositionLow,[GMaxNumReflectionCaptures])\n \/\/ R is brightness, G is array index, B is shape\n SHADER_PARAMETER_ARRAY(FVector4f,CaptureProperties,[GMaxNumReflectionCaptures])\n SHADER_PARAMETER_ARRAY(FVector4f,CaptureOffsetAndAverageBrightness,[GMaxNumReflectionCaptures])\n \/\/ Stores the box transform for a box shape, other data is packed for other shapes\n SHADER_PARAMETER_ARRAY(FMatrix44f,BoxTransform,[GMaxNumReflectionCaptures])\n SHADER_PARAMETER_ARRAY(FVector4f,BoxScales,[GMaxNumReflectionCaptures])\nEND_GLOBAL_SHADER_PARAMETER_STRUCT()\n\nBEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FOpaqueBasePassUniformParameters,)\n SHADER_PARAMETER_STRUCT(FSharedBasePassUniformParameters, Shared)\n SHADER_PARAMETER_STRUCT(FSubstrateBasePassUniformParameters, Substrate)\n \/\/ Forward shading \n SHADER_PARAMETER(int32, UseForwardScreenSpaceShadowMask)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, ForwardScreenSpaceShadowMaskTexture)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, IndirectOcclusionTexture)\n SHADER_PARAMETER_RDG_TEXTURE(Texture2D, ResolvedSceneDepthTexture)\n \/\/ DBuffer decals\n SHADER_PARAMETER_STRUCT_INCLUDE(FDBufferParameters, DBuffer)\n \/\/ Misc\n SHADER_PARAMETER_TEXTURE(Texture2D, PreIntegratedGFTexture)\n SHADER_PARAMETER_SAMPLER(SamplerState, PreIntegratedGFSampler)\n SHADER_PARAMETER(int32, Is24BitUnormDepthStencil)\n SHADER_PARAMETER_RDG_BUFFER_SRV(StructuredBuffer<float4>, EyeAdaptationBuffer)\nEND_GLOBAL_SHADER_PARAMETER_STRUCT()\n\nBEGIN_SHADER_PARAMETER_STRUCT(FInstanceCullingDrawParams, )\n RDG_BUFFER_ACCESS(DrawIndirectArgsBuffer, ERHIAccess::IndirectArgs)\n RDG_BUFFER_ACCESS(InstanceIdOffsetBuffer, ERHIAccess::VertexOrIndexBuffer)\n SHADER_PARAMETER(uint32, InstanceDataByteOffset) \/\/ offset into per-instance buffer\n SHADER_PARAMETER(uint32, IndirectArgsByteOffset) \/\/ offset into indirect args buffer\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FInstanceCullingGlobalUniforms, InstanceCulling) \n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FSceneUniformParameters, Scene)\n SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FBatchedPrimitiveParameters, BatchedPrimitive)\nEND_SHADER_PARAMETER_STRUCT()\n<\/code><\/pre>\nPass Parameter\u5305\u542bView\u3001ReflectionCaptureData\u3001InstanceCulling\u3001OpaqueBasePassUniform<\/p>\n
FOpaqueBasePassParameters* PassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();\nPassParameters->View = View.GetShaderParameters();\nPassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;\nPassParameters->BasePass = CreateOpaqueBasePassUniformBuffer(GraphBuilder, View, ViewIndex, ForwardBasePassTextures, DBufferTextures, bLumenGIEnabled);\nPassParameters->RenderTargets = BasePassRenderTargets;\nPassParameters->RenderTargets.ShadingRateTexture = GVRSImageManager.GetVariableRateShadingImage(GraphBuilder, View, FVariableRateShadingImageManager::EVRSPassType::BasePass);\n\n<\/code><\/pre>\nDispatch Base & Sky Pass<\/h5>\n\n- \u5148\u5224\u65adView\u662f\u5426\u53ef\u4ee5\u6267\u884cBase Pass\n
const bool bShouldRenderView = View.ShouldRenderView();\n\nbool ShouldRenderView() const \n{\n if (bHasNoVisiblePrimitive)\n {\n return false;\n }\n else if (!bIsSinglePassStereo)\n {\n return true;\n }\n else if (bIsSinglePassStereo && !IStereoRendering::IsASecondaryPass(StereoPass))\n {\n return true;\n }\n else\n {\n return false;\n }\n}\n<\/code><\/pre>\n\u82e5\u6ca1\u6709\u53ef\u89c1\u56fe\u5143\u4e0d\u753b<\/p>\n<\/li>\n
- \n
\u82e5View\u53ef\u4ee5\u6267\u884cBase Pass\uff0c\u4e14MeshDrawCommandPasses[EMeshPass::BasePass]\u4e0d\u4e3anull\uff0cDispatch Base Pass<\/p>\n
if (auto* Pass = View.ParallelMeshDrawCommandPasses[EMeshPass::BasePass]; Pass && bShouldRenderView)\n{\n Pass->BuildRenderingCommands(GraphBuilder, Scene->GPUScene, PassParameters->InstanceCullingDrawParams);\n\n GraphBuilder.AddDispatchPass(\n RDG_EVENT_NAME(\"BasePassParallel\"),\n PassParameters,\n ERDGPassFlags::Raster,\n [Pass, PassParameters](FRDGDispatchPassBuilder& DispatchPassBuilder)\n {\n Pass->Dispatch(DispatchPassBuilder, &PassParameters->InstanceCullingDrawParams);\n });\n}\n<\/code><\/pre>\n<\/li>\n- Dispatch Nanite Base Pass\n
const bool bShouldRenderViewForNanite = bNaniteEnabled\n && !View.bHasNoVisiblePrimitive\n && (!bDrawSceneViewsInOneNanitePass || ViewIndex == 0); \nif (bShouldRenderViewForNanite)\n{\n check(Renderer.ShouldRenderPrePass());\n\n RenderNaniteBasePass(View, ViewIndex);\n}\n<\/code><\/pre>\n<\/li>\n- Dispatch Sky Atmosphere\n
if (auto* Pass = View.ParallelMeshDrawCommandPasses[EMeshPass::SkyPass]; Pass && bShouldRenderView && View.Family->EngineShowFlags.Atmosphere)\n{\n FOpaqueBasePassParameters* SkyPassPassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();\n SkyPassPassParameters->BasePass = PassParameters->BasePass;\n SkyPassPassParameters->RenderTargets = BasePassRenderTargets;\n SkyPassPassParameters->View = View.GetShaderParameters();\n SkyPassPassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;\n\n \/\/ Remove all but the SceneColor\n for (uint32 i = 1; i < MaxSimultaneousRenderTargets; ++i)\n {\n SkyPassPassParameters->RenderTargets[i] = FRenderTargetBinding();\n }\n\n Pass->BuildRenderingCommands(GraphBuilder, Scene->GPUScene, SkyPassPassParameters->InstanceCullingDrawParams);\n\n GraphBuilder.AddDispatchPass(\n RDG_EVENT_NAME(\"SkyPassParallel\"),\n SkyPassPassParameters,\n ERDGPassFlags::Raster,\n [Pass, SkyPassPassParameters](FRDGDispatchPassBuilder& DispatchPassBuilder)\n {\n Pass->Dispatch(DispatchPassBuilder, &SkyPassPassParameters->InstanceCullingDrawParams);\n });\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n\u7ed1\u5b9a\u6e32\u67d3\u72b6\u6001<\/h4>\n
\u4f9d\u7136Process\u83b7\u53d6\u7ed1\u5b9aShader\u3001\u8bbe\u7f6eDepthStencilc\u6d4b\u8bd5\u3001\u6392\u5e8f\uff0c\u6d41\u7a0b\u4e0e\u4e00\u822c\u7684Pass\u7c7b\u4f3c\uff0c\u4e0d\u518d\u8d58\u8ff0\uff0c\u8fd9\u91cc\u53ea\u63d0\u4e24\u4e2a\u989d\u5916\u7684\u64cd\u4f5c<\/p>\n
\n- \u8bbe\u7f6eDecal Stencil Ref\n
if (bEnableReceiveDecalOutput)\n{\nuint8 StencilValue = 0;\nStencilValue = \n GET_STENCIL_BIT_MASK(RECEIVE_DECAL, PrimitiveSceneProxy ? !!PrimitiveSceneProxy->ReceivesDecals() : 0x00)\n | GET_STENCIL_BIT_MASK(RAY_TRACING_REPRESENTATION, bHasRayTracingRepresentation)\n | STENCIL_LIGHTING_CHANNELS_MASK(PrimitiveSceneProxy ? PrimitiveSceneProxy->GetLightingChannelStencilValue() : 0x00);\n DrawRenderState.SetStencilRef(StencilValue);\n}\n<\/code><\/pre>\n\u7528\u4e8e\u6807\u8bb0Decal \u6e32\u67d3\u533a\u57df<\/p>\n<\/li>\n
- \n
\u82e5\u6750\u8d28\u7c7b\u578b\u662fTranslucent\uff0c\u800c\u975eopaque\uff0c\u5219\u8bbe\u7f6e\u9002\u5408Translucent\u7684\u6e32\u67d3\u72b6\u6001<\/p>\n
if (bTranslucentBasePass)\n{\n SetTranslucentRenderState(DrawRenderState, MaterialResource, GShaderPlatformForFeatureLevel[FeatureLevel], TranslucencyPassType);\n}\n<\/code><\/pre>\n<\/li>\n- \u7ed1\u5b9a\u7684Shader\n
\n- VS Shader<\/li>\n<\/ul>\n
#define IMPLEMENT_BASEPASS_VERTEXSHADER_TYPE(LightMapPolicyType,LightMapPolicyName) \\\n typedef TBasePassVS< LightMapPolicyType > TBasePassVS##LightMapPolicyName ; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassVS##LightMapPolicyName,TEXT(\"\/Engine\/Private\/BasePassVertexShader.usf\"),TEXT(\"Main\"),SF_Vertex);\n\n<\/code><\/pre>\n\n- PS Shader<\/li>\n<\/ul>\n
#define IMPLEMENT_BASEPASS_PIXELSHADER_TYPE(LightMapPolicyType,LightMapPolicyName,bEnableSkyLight,SkyLightName,GBufferLayout,LayoutName) \\\n typedef TBasePassPS<LightMapPolicyType, bEnableSkyLight, GBufferLayout> TBasePassPS##LightMapPolicyName##SkyLightName##LayoutName; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassPS##LightMapPolicyName##SkyLightName##LayoutName,TEXT(\"\/Engine\/Private\/BasePassPixelShader.usf\"),TEXT(\"MainPS\"),SF_Pixel);\n\n#define IMPLEMENT_BASEPASS_COMPUTESHADER_TYPE(LightMapPolicyType,LightMapPolicyName,bEnableSkyLight,SkyLightName,bVoxel,VoxelName) \\\n typedef TBasePassCS<LightMapPolicyType, bEnableSkyLight, bVoxel, SF_Compute> TBasePassCS##LightMapPolicyName##SkyLightName##VoxelName; \\\n IMPLEMENT_MATERIAL_SHADER_TYPE(template<>,TBasePassCS##LightMapPolicyName##SkyLightName##VoxelName,TEXT(\"\/Engine\/Private\/BasePassPixelShader.usf\"),TEXT(\"MainCS\"),SF_Compute);\n\n<\/code><\/pre>\n<\/li>\n<\/ul>\nGPU\u7aef<\/h2>\n
\n