vault backup: 2024-09-27 19:44:52
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@ -22,7 +22,7 @@ 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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1. 创建MRT并绑定、取得深度缓存。
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```c++
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const FExclusiveDepthStencil ExclusiveDepthStencil(BasePassDepthStencilAccess);
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@ -58,10 +58,173 @@ GraphBuilder.AddPass(RDG_EVENT_NAME("GBufferClear"), PassParameters, ERDGPassFla
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}
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});
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```
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3.
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3. RenderTargetBindingSlots
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```c++
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// Render targets bindings should remain constant at this point.
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FRenderTargetBindingSlots BasePassRenderTargets = GetRenderTargetBindings(ERenderTargetLoadAction::ELoad, BasePassTexturesView);
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BasePassRenderTargets.DepthStencil = FDepthStencilBinding(BasePassDepthTexture, ERenderTargetLoadAction::ELoad, ERenderTargetLoadAction::ELoad, ExclusiveDepthStencil);
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```
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4. RenderBasePassInternal()
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5. RenderAnisotropyPass()
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# MeshDraw
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## RenderBasePassInternal()
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RenderNaniteBasePass()为一个Lambda，最终调用**Nanite::DrawBasePass()** 渲染Nanite物体的BasePass。其他相关渲染代码如下：
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```c++
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SCOPE_CYCLE_COUNTER(STAT_BasePassDrawTime);
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RDG_EVENT_SCOPE(GraphBuilder, "BasePass");
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RDG_GPU_STAT_SCOPE(GraphBuilder, Basepass);
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# SetDepthStencilStateForBasePass()
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const bool bDrawSceneViewsInOneNanitePass = Views.Num() > 1 && Nanite::ShouldDrawSceneViewsInOneNanitePass(Views[0]);
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if (bParallelBasePass)//并行渲染模式
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{
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RDG_WAIT_FOR_TASKS_CONDITIONAL(GraphBuilder, IsBasePassWaitForTasksEnabled());
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for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ++ViewIndex)
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{
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FViewInfo& View = Views[ViewIndex];
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RDG_GPU_MASK_SCOPE(GraphBuilder, View.GPUMask);
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RDG_EVENT_SCOPE_CONDITIONAL(GraphBuilder, Views.Num() > 1, "View%d", ViewIndex);
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View.BeginRenderView();
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const bool bLumenGIEnabled = GetViewPipelineState(View).DiffuseIndirectMethod == EDiffuseIndirectMethod::Lumen;
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FMeshPassProcessorRenderState DrawRenderState;
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SetupBasePassState(BasePassDepthStencilAccess, ViewFamily.EngineShowFlags.ShaderComplexity, DrawRenderState);
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FOpaqueBasePassParameters* PassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();
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PassParameters->View = View.GetShaderParameters();
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PassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;
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PassParameters->BasePass = CreateOpaqueBasePassUniformBuffer(GraphBuilder, View, ViewIndex, ForwardBasePassTextures, DBufferTextures, bLumenGIEnabled);
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PassParameters->RenderTargets = BasePassRenderTargets;
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PassParameters->RenderTargets.ShadingRateTexture = GVRSImageManager.GetVariableRateShadingImage(GraphBuilder, View, FVariableRateShadingImageManager::EVRSPassType::BasePass);
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const bool bShouldRenderView = View.ShouldRenderView();
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if (bShouldRenderView)
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{
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View.ParallelMeshDrawCommandPasses[EMeshPass::BasePass].BuildRenderingCommands(GraphBuilder, Scene->GPUScene, PassParameters->InstanceCullingDrawParams);
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GraphBuilder.AddPass(
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RDG_EVENT_NAME("BasePassParallel"),
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PassParameters,
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ERDGPassFlags::Raster | ERDGPassFlags::SkipRenderPass,
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[this, &View, PassParameters](const FRDGPass* InPass, FRHICommandListImmediate& RHICmdList)
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{
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FRDGParallelCommandListSet ParallelCommandListSet(InPass, RHICmdList, GET_STATID(STAT_CLP_BasePass), View, FParallelCommandListBindings(PassParameters));
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View.ParallelMeshDrawCommandPasses[EMeshPass::BasePass].DispatchDraw(&ParallelCommandListSet, RHICmdList, &PassParameters->InstanceCullingDrawParams);
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});
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}
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const bool bShouldRenderViewForNanite = bNaniteEnabled && (!bDrawSceneViewsInOneNanitePass || ViewIndex == 0); // when bDrawSceneViewsInOneNanitePass, the first view should cover all the other atlased ones
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if (bShouldRenderViewForNanite)
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{
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// Should always have a full Z prepass with Nanite
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check(ShouldRenderPrePass());
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//渲染Nanite物体BasePass
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RenderNaniteBasePass(View, ViewIndex);
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}
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//渲染编辑器相关的图元物体
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RenderEditorPrimitives(GraphBuilder, PassParameters, View, DrawRenderState, InstanceCullingManager);
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//渲染大气
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if (bShouldRenderView && View.Family->EngineShowFlags.Atmosphere)
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{
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FOpaqueBasePassParameters* SkyPassPassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();
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SkyPassPassParameters->BasePass = PassParameters->BasePass;
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SkyPassPassParameters->RenderTargets = BasePassRenderTargets;
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SkyPassPassParameters->View = View.GetShaderParameters();
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SkyPassPassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;
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View.ParallelMeshDrawCommandPasses[EMeshPass::SkyPass].BuildRenderingCommands(GraphBuilder, Scene->GPUScene, SkyPassPassParameters->InstanceCullingDrawParams);
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GraphBuilder.AddPass(
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RDG_EVENT_NAME("SkyPassParallel"),
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SkyPassPassParameters,
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ERDGPassFlags::Raster | ERDGPassFlags::SkipRenderPass,
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[this, &View, SkyPassPassParameters](const FRDGPass* InPass, FRHICommandListImmediate& RHICmdList)
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{
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FRDGParallelCommandListSet ParallelCommandListSet(InPass, RHICmdList, GET_STATID(STAT_CLP_BasePass), View, FParallelCommandListBindings(SkyPassPassParameters));
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View.ParallelMeshDrawCommandPasses[EMeshPass::SkyPass].DispatchDraw(&ParallelCommandListSet, RHICmdList, &SkyPassPassParameters->InstanceCullingDrawParams);
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});
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}
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}
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}
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else
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{
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for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ++ViewIndex)
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{
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FViewInfo& View = Views[ViewIndex];
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RDG_GPU_MASK_SCOPE(GraphBuilder, View.GPUMask);
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RDG_EVENT_SCOPE_CONDITIONAL(GraphBuilder, Views.Num() > 1, "View%d", ViewIndex);
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View.BeginRenderView();
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const bool bLumenGIEnabled = GetViewPipelineState(View).DiffuseIndirectMethod == EDiffuseIndirectMethod::Lumen;
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FMeshPassProcessorRenderState DrawRenderState;
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SetupBasePassState(BasePassDepthStencilAccess, ViewFamily.EngineShowFlags.ShaderComplexity, DrawRenderState);
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FOpaqueBasePassParameters* PassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();
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PassParameters->View = View.GetShaderParameters();
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PassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;
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PassParameters->BasePass = CreateOpaqueBasePassUniformBuffer(GraphBuilder, View, ViewIndex, ForwardBasePassTextures, DBufferTextures, bLumenGIEnabled);
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PassParameters->RenderTargets = BasePassRenderTargets;
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PassParameters->RenderTargets.ShadingRateTexture = GVRSImageManager.GetVariableRateShadingImage(GraphBuilder, View, FVariableRateShadingImageManager::EVRSPassType::BasePass);
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const bool bShouldRenderView = View.ShouldRenderView();
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if (bShouldRenderView)
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{
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View.ParallelMeshDrawCommandPasses[EMeshPass::BasePass].BuildRenderingCommands(GraphBuilder, Scene->GPUScene, PassParameters->InstanceCullingDrawParams);
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GraphBuilder.AddPass(
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RDG_EVENT_NAME("BasePass"),
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PassParameters,
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ERDGPassFlags::Raster,
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[this, &View, PassParameters](FRHICommandList& RHICmdList)
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{
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SetStereoViewport(RHICmdList, View, 1.0f);
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View.ParallelMeshDrawCommandPasses[EMeshPass::BasePass].DispatchDraw(nullptr, RHICmdList, &PassParameters->InstanceCullingDrawParams);
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}
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);
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}
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const bool bShouldRenderViewForNanite = bNaniteEnabled && (!bDrawSceneViewsInOneNanitePass || ViewIndex == 0); // when bDrawSceneViewsInOneNanitePass, the first view should cover all the other atlased ones
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if (bShouldRenderViewForNanite)
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{
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// Should always have a full Z prepass with Nanite
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check(ShouldRenderPrePass());
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RenderNaniteBasePass(View, ViewIndex);
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}
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RenderEditorPrimitives(GraphBuilder, PassParameters, View, DrawRenderState, InstanceCullingManager);
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if (bShouldRenderView && View.Family->EngineShowFlags.Atmosphere)
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{
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FOpaqueBasePassParameters* SkyPassParameters = GraphBuilder.AllocParameters<FOpaqueBasePassParameters>();
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SkyPassParameters->BasePass = PassParameters->BasePass;
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SkyPassParameters->RenderTargets = BasePassRenderTargets;
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SkyPassParameters->View = View.GetShaderParameters();
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SkyPassParameters->ReflectionCapture = View.ReflectionCaptureUniformBuffer;
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View.ParallelMeshDrawCommandPasses[EMeshPass::SkyPass].BuildRenderingCommands(GraphBuilder, Scene->GPUScene, SkyPassParameters->InstanceCullingDrawParams);
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GraphBuilder.AddPass(
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RDG_EVENT_NAME("SkyPass"),
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SkyPassParameters,
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ERDGPassFlags::Raster,
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[this, &View, SkyPassParameters](FRHICommandList& RHICmdList)
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{
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SetStereoViewport(RHICmdList, View, 1.0f);
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View.ParallelMeshDrawCommandPasses[EMeshPass::SkyPass].DispatchDraw(nullptr, RHICmdList, &SkyPassParameters->InstanceCullingDrawParams);
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}
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);
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}
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}
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}
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```
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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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@ -98,4 +261,118 @@ void SetDepthStencilStateForBasePass(
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}
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}
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```
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#
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## AnisotropyPass
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Anisotropy的RT设置：
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- RenderTarget：SceneTextures.GBufferF。
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- DepthStencil：SceneTextures.Depth.Target。**ERenderTargetLoadAction::ELoad**、**FExclusiveDepthStencil::DepthRead_StencilNop**
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### 管线状态
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在FAnisotropyMeshProcessor::CollectPSOInitializers()中：
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```c++
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ETextureCreateFlags GBufferFCreateFlags;
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EPixelFormat GBufferFPixelFormat = FSceneTextures::GetGBufferFFormatAndCreateFlags(GBufferFCreateFlags);
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AddRenderTargetInfo(GBufferFPixelFormat, GBufferFCreateFlags, RenderTargetsInfo);
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SetupDepthStencilInfo(PF_DepthStencil, SceneTexturesConfig.DepthCreateFlags, ERenderTargetLoadAction::ELoad,
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ERenderTargetLoadAction::ELoad, FExclusiveDepthStencil::DepthRead_StencilNop, RenderTargetsInfo);
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```
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```c++
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void SetupDepthStencilInfo(
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EPixelFormat DepthStencilFormat,
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ETextureCreateFlags DepthStencilCreateFlags,
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ERenderTargetLoadAction DepthTargetLoadAction,
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ERenderTargetLoadAction StencilTargetLoadAction,
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FExclusiveDepthStencil DepthStencilAccess,
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FGraphicsPipelineRenderTargetsInfo& RenderTargetsInfo)
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{
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// Setup depth stencil state
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RenderTargetsInfo.DepthStencilTargetFormat = DepthStencilFormat;
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RenderTargetsInfo.DepthStencilTargetFlag = DepthStencilCreateFlags;
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RenderTargetsInfo.DepthTargetLoadAction = DepthTargetLoadAction;
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RenderTargetsInfo.StencilTargetLoadAction = StencilTargetLoadAction;
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RenderTargetsInfo.DepthStencilAccess = DepthStencilAccess;
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const ERenderTargetStoreAction StoreAction = EnumHasAnyFlags(RenderTargetsInfo.DepthStencilTargetFlag, TexCreate_Memoryless) ? ERenderTargetStoreAction::ENoAction : ERenderTargetStoreAction::EStore;
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RenderTargetsInfo.DepthTargetStoreAction = RenderTargetsInfo.DepthStencilAccess.IsUsingDepth() ? StoreAction : ERenderTargetStoreAction::ENoAction;
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RenderTargetsInfo.StencilTargetStoreAction = RenderTargetsInfo.DepthStencilAccess.IsUsingStencil() ? StoreAction : ERenderTargetStoreAction::ENoAction;
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}
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```
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### ParallelRendering
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AnisotropyPass支持并行渲染，并行渲染的判断逻辑为
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```c++
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const bool bEnableParallelBasePasses = GRHICommandList.UseParallelAlgorithms() && CVarParallelBasePass.GetValueOnRenderThread();
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```
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看得出判断条件是：
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1. 显卡是否支持并行渲染。
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2. CVar（r.ParallelBasePass）是否开启并行渲染。
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从AnisotropyPass可以看得出并行渲染与一般渲染的差别在于：
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1. FRenderTargetBinding绑定时的ERenderTargetLoadAction不同，**并行为ELoad**；**普通渲染为EClear**。
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2. 调用AddPass添加了**ERDGPassFlags::SkipRenderPass**标记。
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3. 并行渲染会在AddPass中构建**FRDGParallelCommandListSet ParallelCommandListSet**，并作为传入**DispatchDraw**；普通渲染传递nullptr。
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4. 普通渲染会额外调用**SetStereoViewport(RHICmdList, View);**，本质是调用RHICmdList.SetViewport来设置View。
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### Code
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```c++
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RDG_CSV_STAT_EXCLUSIVE_SCOPE(GraphBuilder, RenderAnisotropyPass);
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SCOPED_NAMED_EVENT(FDeferredShadingSceneRenderer_RenderAnisotropyPass, FColor::Emerald);
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SCOPE_CYCLE_COUNTER(STAT_AnisotropyPassDrawTime);
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RDG_GPU_STAT_SCOPE(GraphBuilder, RenderAnisotropyPass);
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for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
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{
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FViewInfo& View = Views[ViewIndex];
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if (View.ShouldRenderView())
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{
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FParallelMeshDrawCommandPass& ParallelMeshPass = View.ParallelMeshDrawCommandPasses[EMeshPass::AnisotropyPass];
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if (!ParallelMeshPass.HasAnyDraw())
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{
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continue;
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}
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View.BeginRenderView();
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auto* PassParameters = GraphBuilder.AllocParameters<FAnisotropyPassParameters>();
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PassParameters->View = View.GetShaderParameters();
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PassParameters->RenderTargets.DepthStencil = FDepthStencilBinding(SceneTextures.Depth.Target, ERenderTargetLoadAction::ELoad, FExclusiveDepthStencil::DepthRead_StencilNop);
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ParallelMeshPass.BuildRenderingCommands(GraphBuilder, Scene->GPUScene, PassParameters->InstanceCullingDrawParams);
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if (bDoParallelPass)
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{
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AddClearRenderTargetPass(GraphBuilder, SceneTextures.GBufferF);
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PassParameters->RenderTargets[0] = FRenderTargetBinding(SceneTextures.GBufferF, ERenderTargetLoadAction::ELoad);
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GraphBuilder.AddPass(
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RDG_EVENT_NAME("AnisotropyPassParallel"),
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PassParameters,
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ERDGPassFlags::Raster | ERDGPassFlags::SkipRenderPass,
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[this, &View, &ParallelMeshPass, PassParameters](const FRDGPass* InPass, FRHICommandListImmediate& RHICmdList)
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{
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FRDGParallelCommandListSet ParallelCommandListSet(InPass, RHICmdList, GET_STATID(STAT_CLP_AnisotropyPass), View, FParallelCommandListBindings(PassParameters));
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ParallelMeshPass.DispatchDraw(&ParallelCommandListSet, RHICmdList, &PassParameters->InstanceCullingDrawParams);
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});
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}
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else
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{
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PassParameters->RenderTargets[0] = FRenderTargetBinding(SceneTextures.GBufferF, ERenderTargetLoadAction::EClear);
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GraphBuilder.AddPass(
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RDG_EVENT_NAME("AnisotropyPass"),
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PassParameters,
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ERDGPassFlags::Raster,
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[this, &View, &ParallelMeshPass, PassParameters](FRHICommandList& RHICmdList)
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{
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SetStereoViewport(RHICmdList, View);
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ParallelMeshPass.DispatchDraw(nullptr, RHICmdList, &PassParameters->InstanceCullingDrawParams);
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});
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}
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}
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}
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```
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@ -32,6 +32,7 @@ OutGBufferD = GBuffer.CustomData
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OutGBufferE = GBuffer.PrecomputedShadowFactors (GBT_Unorm_8_8_8_8)
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TargetVelocity / OutGBufferF = velocity / tangent (默认不开启 带有深度<开启Lumen与距离场 或者 开启光线追踪> GBC_Raw_Float_16_16_16_16 不带深度 GBC_Raw_Float_16_16)
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TargetSeparatedMainDirLight = SingleLayerWater相关 (有SingleLayerWater才会开启 GBC_Raw_Float_11_11_10)
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OutGBufferF = Anisotropy
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// 0..1, 2 bits, use CastContactShadow(GBuffer) or HasDynamicIndirectShadowCasterRepresentation(GBuffer) to extract
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half PerObjectGBufferData;
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