2024-09-27 11:52:24 +08:00
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---
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title: Untitled
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date: 2024-09-26 18:41:24
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excerpt:
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tags:
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rating: ⭐
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---
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2024-09-27 13:10:09 +08:00
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# RenderBasePass()
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传入RenderBasePass()的DepthStencil逻辑如下：
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```c++
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const FExclusiveDepthStencil::Type BasePassDepthStencilAccess =
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bAllowReadOnlyDepthBasePass
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? FExclusiveDepthStencil::DepthRead_StencilWrite
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: FExclusiveDepthStencil::DepthWrite_StencilWrite;
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```
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FDeferredShadingSceneRenderer::RenderBasePass() =>
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FDeferredShadingSceneRenderer::RenderBasePassInternal() =>
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FBasePassMeshProcessor::TryAddMeshBatch =>
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## 大致流程
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1. 绑定GBuffer与Depth。
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```c++
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const FExclusiveDepthStencil ExclusiveDepthStencil(BasePassDepthStencilAccess);
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TStaticArray<FTextureRenderTargetBinding, MaxSimultaneousRenderTargets> BasePassTextures;
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uint32 BasePassTextureCount = SceneTextures.GetGBufferRenderTargets(BasePassTextures);
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Strata::AppendStrataMRTs(*this, BasePassTextureCount, BasePassTextures);
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TArrayView<FTextureRenderTargetBinding> BasePassTexturesView = MakeArrayView(BasePassTextures.GetData(), BasePassTextureCount);
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FRDGTextureRef BasePassDepthTexture = SceneTextures.Depth.Target;
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```
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2. GBuffer Clear
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```c++
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GraphBuilder.AddPass(RDG_EVENT_NAME("GBufferClear"), PassParameters, ERDGPassFlags::Raster,
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[PassParameters, ColorLoadAction, SceneColorClearValue](FRHICommandList& RHICmdList)
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{
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// If no fast-clear action was used, we need to do an MRT shader clear.
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if (ColorLoadAction == ERenderTargetLoadAction::ENoAction)
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{
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const FRenderTargetBindingSlots& RenderTargets = PassParameters->RenderTargets;
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FLinearColor ClearColors[MaxSimultaneousRenderTargets];
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FRHITexture* Textures[MaxSimultaneousRenderTargets];
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int32 TextureIndex = 0;
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RenderTargets.Enumerate([&](const FRenderTargetBinding& RenderTarget)
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{
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FRHITexture* TextureRHI = RenderTarget.GetTexture()->GetRHI();
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ClearColors[TextureIndex] = TextureIndex == 0 ? SceneColorClearValue : TextureRHI->GetClearColor();
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Textures[TextureIndex] = TextureRHI;
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++TextureIndex;
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});
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// Clear color only; depth-stencil is fast cleared.
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DrawClearQuadMRT(RHICmdList, true, TextureIndex, ClearColors, false, 0, false, 0);
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}
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});
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```
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3.
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2024-09-27 11:52:24 +08:00
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# SetDepthStencilStateForBasePass()
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```c++
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void SetDepthStencilStateForBasePass(
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FMeshPassProcessorRenderState& DrawRenderState,
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ERHIFeatureLevel::Type FeatureLevel,
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bool bDitheredLODTransition,
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const FMaterial& MaterialResource,
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bool bEnableReceiveDecalOutput,
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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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