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Engine\Source\Runtime\Renderer\Private\ShadowDepthRendering.cpp
void FSceneRenderer::RenderShadowDepthMaps(FRHICommandListImmediate& RHICmdList)
{
check(RHICmdList.IsOutsideRenderPass());
CSV_SCOPED_TIMING_STAT_EXCLUSIVE(RenderShadows);
SCOPED_NAMED_EVENT(FSceneRenderer_RenderShadowDepthMaps, FColor::Emerald);
FSceneRenderTargets& SceneContext = FSceneRenderTargets::Get(RHICmdList);
SCOPED_DRAW_EVENT(RHICmdList, ShadowDepths);
SCOPED_GPU_STAT(RHICmdList, ShadowDepths);
FSceneRenderer::RenderShadowDepthMapAtlases(RHICmdList);
checkSlow(RHICmdList.IsOutsideRenderPass());
// Perform setup work on all GPUs in case any cached shadows are being updated this
// frame. We revert to the AllViewsGPUMask for uncached shadows.
#if WITH_MGPU
ensure(RHICmdList.GetGPUMask() == AllViewsGPUMask);
#endif
SCOPED_GPU_MASK(RHICmdList, FRHIGPUMask::All());
for (int32 CubemapIndex = 0; CubemapIndex < SortedShadowsForShadowDepthPass.ShadowMapCubemaps.Num(); CubemapIndex++)
{
const FSortedShadowMapAtlas& ShadowMap = SortedShadowsForShadowDepthPass.ShadowMapCubemaps[CubemapIndex];
FSceneRenderTargetItem& RenderTarget = ShadowMap.RenderTargets.DepthTarget->GetRenderTargetItem();
FIntPoint TargetSize = ShadowMap.RenderTargets.DepthTarget->GetDesc().Extent;
check(ShadowMap.Shadows.Num() == 1);
FProjectedShadowInfo* ProjectedShadowInfo = ShadowMap.Shadows[0];
SCOPED_GPU_MASK(RHICmdList, GetGPUMaskForShadow(ProjectedShadowInfo));
const bool bDoParallelDispatch = RHICmdList.IsImmediate() && // translucent shadows are draw on the render thread, using a recursive cmdlist (which is not immediate)
GRHICommandList.UseParallelAlgorithms() && CVarParallelShadows.GetValueOnRenderThread() &&
(ProjectedShadowInfo->IsWholeSceneDirectionalShadow() || CVarParallelShadowsNonWholeScene.GetValueOnRenderThread());
GVisualizeTexture.SetCheckPoint(RHICmdList, ShadowMap.RenderTargets.DepthTarget.GetReference());
FString LightNameWithLevel;
GetLightNameForDrawEvent(ProjectedShadowInfo->GetLightSceneInfo().Proxy, LightNameWithLevel);
SCOPED_DRAW_EVENTF(RHICmdList, EventShadowDepths, TEXT("Cubemap %s %u^2"), *LightNameWithLevel, TargetSize.X, TargetSize.Y);
ProjectedShadowInfo->SetupShadowUniformBuffers(RHICmdList, Scene);
auto BeginShadowRenderPass = [this, &RenderTarget, &SceneContext](FRHICommandList& InRHICmdList, bool bPerformClear)
{
FRHITexture* DepthTarget = RenderTarget.TargetableTexture;
ERenderTargetLoadAction DepthLoadAction = bPerformClear ? ERenderTargetLoadAction::EClear : ERenderTargetLoadAction::ELoad;
check(DepthTarget->GetDepthClearValue() == 1.0f);
FRHIRenderPassInfo RPInfo(DepthTarget, MakeDepthStencilTargetActions(MakeRenderTargetActions(DepthLoadAction, ERenderTargetStoreAction::EStore), ERenderTargetActions::DontLoad_DontStore), nullptr, FExclusiveDepthStencil::DepthWrite_StencilNop);
if (!GSupportsDepthRenderTargetWithoutColorRenderTarget)
{
RPInfo.ColorRenderTargets[0].Action = ERenderTargetActions::DontLoad_DontStore;
RPInfo.ColorRenderTargets[0].ArraySlice = -1;
RPInfo.ColorRenderTargets[0].MipIndex = 0;
RPInfo.ColorRenderTargets[0].RenderTarget = SceneContext.GetOptionalShadowDepthColorSurface(InRHICmdList, DepthTarget->GetTexture2D()->GetSizeX(), DepthTarget->GetTexture2D()->GetSizeY());
InRHICmdList.Transition(FRHITransitionInfo(RPInfo.ColorRenderTargets[0].RenderTarget, ERHIAccess::Unknown, ERHIAccess::RTV));
}
InRHICmdList.Transition(FRHITransitionInfo(DepthTarget, ERHIAccess::Unknown, ERHIAccess::DSVWrite));
InRHICmdList.BeginRenderPass(RPInfo, TEXT("ShadowDepthCubeMaps"));
};
{
bool bDoClear = true;
if (ProjectedShadowInfo->CacheMode == SDCM_MovablePrimitivesOnly
&& Scene->CachedShadowMaps.FindChecked(ProjectedShadowInfo->GetLightSceneInfo().Id).bCachedShadowMapHasPrimitives)
{
// Skip the clear when we'll copy from a cached shadowmap
bDoClear = false;
}
SCOPED_CONDITIONAL_DRAW_EVENT(RHICmdList, Clear, bDoClear);
BeginShadowRenderPass(RHICmdList, bDoClear);
}
if (bDoParallelDispatch)
{
// In parallel mode this first pass will just be the clear.
RHICmdList.EndRenderPass();
}
ProjectedShadowInfo->RenderDepth(RHICmdList, this, BeginShadowRenderPass, bDoParallelDispatch);
if (!bDoParallelDispatch)
{
RHICmdList.EndRenderPass();
}
RHICmdList.Transition(FRHITransitionInfo(RenderTarget.TargetableTexture, ERHIAccess::Unknown, ERHIAccess::SRVMask));
}
checkSlow(RHICmdList.IsOutsideRenderPass());
if (SortedShadowsForShadowDepthPass.PreshadowCache.Shadows.Num() > 0)
{
FSceneRenderTargetItem& RenderTarget = SortedShadowsForShadowDepthPass.PreshadowCache.RenderTargets.DepthTarget->GetRenderTargetItem();
GVisualizeTexture.SetCheckPoint(RHICmdList, SortedShadowsForShadowDepthPass.PreshadowCache.RenderTargets.DepthTarget.GetReference());
SCOPED_DRAW_EVENT(RHICmdList, PreshadowCache);
for (int32 ShadowIndex = 0; ShadowIndex < SortedShadowsForShadowDepthPass.PreshadowCache.Shadows.Num(); ShadowIndex++)
{
FProjectedShadowInfo* ProjectedShadowInfo = SortedShadowsForShadowDepthPass.PreshadowCache.Shadows[ShadowIndex];
if (!ProjectedShadowInfo->bDepthsCached)
{
SCOPED_GPU_MASK(RHICmdList, GetGPUMaskForShadow(ProjectedShadowInfo));
const bool bDoParallelDispatch = RHICmdList.IsImmediate() && // translucent shadows are draw on the render thread, using a recursive cmdlist (which is not immediate)
GRHICommandList.UseParallelAlgorithms() && CVarParallelShadows.GetValueOnRenderThread() &&
(ProjectedShadowInfo->IsWholeSceneDirectionalShadow() || CVarParallelShadowsNonWholeScene.GetValueOnRenderThread());
ProjectedShadowInfo->SetupShadowUniformBuffers(RHICmdList, Scene);
auto BeginShadowRenderPass = [this, ProjectedShadowInfo](FRHICommandList& InRHICmdList, bool bPerformClear)
{
FRHITexture* PreShadowCacheDepthZ = Scene->PreShadowCacheDepthZ->GetRenderTargetItem().TargetableTexture.GetReference();
InRHICmdList.TransitionResources(ERHIAccess::DSVWrite, &PreShadowCacheDepthZ, 1);
FRHIRenderPassInfo RPInfo(PreShadowCacheDepthZ, EDepthStencilTargetActions::LoadDepthNotStencil_StoreDepthNotStencil, nullptr, FExclusiveDepthStencil::DepthWrite_StencilNop);
// Must preserve existing contents as the clear will be scissored
InRHICmdList.BeginRenderPass(RPInfo, TEXT("ShadowDepthMaps"));
ProjectedShadowInfo->ClearDepth(InRHICmdList, this, 0, nullptr, PreShadowCacheDepthZ, bPerformClear);
};
BeginShadowRenderPass(RHICmdList, true);
if (bDoParallelDispatch)
{
// In parallel mode the first pass is just the clear.
RHICmdList.EndRenderPass();
}
ProjectedShadowInfo->RenderDepth(RHICmdList, this, BeginShadowRenderPass, bDoParallelDispatch);
if (!bDoParallelDispatch)
{
RHICmdList.EndRenderPass();
}
ProjectedShadowInfo->bDepthsCached = true;
}
}
RHICmdList.Transition(FRHITransitionInfo(RenderTarget.TargetableTexture, ERHIAccess::Unknown, ERHIAccess::SRVMask));
}
for (int32 AtlasIndex = 0; AtlasIndex < SortedShadowsForShadowDepthPass.TranslucencyShadowMapAtlases.Num(); AtlasIndex++)
{
const FSortedShadowMapAtlas& ShadowMapAtlas = SortedShadowsForShadowDepthPass.TranslucencyShadowMapAtlases[AtlasIndex];
FIntPoint TargetSize = ShadowMapAtlas.RenderTargets.ColorTargets[0]->GetDesc().Extent;
SCOPED_DRAW_EVENTF(RHICmdList, EventShadowDepths, TEXT("TranslucencyAtlas%u %u^2"), AtlasIndex, TargetSize.X, TargetSize.Y);
FSceneRenderTargetItem ColorTarget0 = ShadowMapAtlas.RenderTargets.ColorTargets[0]->GetRenderTargetItem();
FSceneRenderTargetItem ColorTarget1 = ShadowMapAtlas.RenderTargets.ColorTargets[1]->GetRenderTargetItem();
FRHITexture* RenderTargetArray[2] =
{
ColorTarget0.TargetableTexture,
ColorTarget1.TargetableTexture
};
FRHIRenderPassInfo RPInfo(UE_ARRAY_COUNT(RenderTargetArray), RenderTargetArray, ERenderTargetActions::Load_Store);
TransitionRenderPassTargets(RHICmdList, RPInfo);
RHICmdList.BeginRenderPass(RPInfo, TEXT("RenderTranslucencyDepths"));
{
for (int32 ShadowIndex = 0; ShadowIndex < ShadowMapAtlas.Shadows.Num(); ShadowIndex++)
{
FProjectedShadowInfo* ProjectedShadowInfo = ShadowMapAtlas.Shadows[ShadowIndex];
SCOPED_GPU_MASK(RHICmdList, GetGPUMaskForShadow(ProjectedShadowInfo));
ProjectedShadowInfo->SetupShadowUniformBuffers(RHICmdList, Scene);
ProjectedShadowInfo->RenderTranslucencyDepths(RHICmdList, this);
}
}
RHICmdList.EndRenderPass();
RHICmdList.Transition(FRHITransitionInfo(ColorTarget0.TargetableTexture, ERHIAccess::Unknown, ERHIAccess::SRVMask));
RHICmdList.Transition(FRHITransitionInfo(ColorTarget1.TargetableTexture, ERHIAccess::Unknown, ERHIAccess::SRVMask));
}
// Get a copy of LpvWriteUniformBufferParams for parallel RSM draw-call submission
{
for (int32 ViewIdx = 0; ViewIdx < Views.Num(); ++ViewIdx)
{
FViewInfo& View = Views[ViewIdx];
FSceneViewState* ViewState = View.ViewState;
if (ViewState)
{
FLightPropagationVolume* Lpv = ViewState->GetLightPropagationVolume(FeatureLevel);
if (Lpv)
{
Lpv->SetRsmUniformBuffer();
}
}
}
}
for (int32 AtlasIndex = 0; AtlasIndex < SortedShadowsForShadowDepthPass.RSMAtlases.Num(); AtlasIndex++)
{
checkSlow(RHICmdList.IsOutsideRenderPass());
const FSortedShadowMapAtlas& ShadowMapAtlas = SortedShadowsForShadowDepthPass.RSMAtlases[AtlasIndex];
FSceneRenderTargetItem ColorTarget0 = ShadowMapAtlas.RenderTargets.ColorTargets[0]->GetRenderTargetItem();
FSceneRenderTargetItem ColorTarget1 = ShadowMapAtlas.RenderTargets.ColorTargets[1]->GetRenderTargetItem();
FSceneRenderTargetItem DepthTarget = ShadowMapAtlas.RenderTargets.DepthTarget->GetRenderTargetItem();
FIntPoint TargetSize = ShadowMapAtlas.RenderTargets.DepthTarget->GetDesc().Extent;
SCOPED_DRAW_EVENTF(RHICmdList, EventShadowDepths, TEXT("RSM%u %ux%u"), AtlasIndex, TargetSize.X, TargetSize.Y);
for (int32 ShadowIndex = 0; ShadowIndex < ShadowMapAtlas.Shadows.Num(); ShadowIndex++)
{
FProjectedShadowInfo* ProjectedShadowInfo = ShadowMapAtlas.Shadows[ShadowIndex];
SCOPED_GPU_MASK(RHICmdList, GetGPUMaskForShadow(ProjectedShadowInfo));
const bool bDoParallelDispatch = RHICmdList.IsImmediate() && // translucent shadows are draw on the render thread, using a recursive cmdlist (which is not immediate)
GRHICommandList.UseParallelAlgorithms() && CVarParallelShadows.GetValueOnRenderThread() &&
(ProjectedShadowInfo->IsWholeSceneDirectionalShadow() || CVarParallelShadowsNonWholeScene.GetValueOnRenderThread());
FSceneViewState* ViewState = (FSceneViewState*)ProjectedShadowInfo->DependentView->State;
FLightPropagationVolume* LightPropagationVolume = ViewState->GetLightPropagationVolume(FeatureLevel);
ProjectedShadowInfo->SetupShadowUniformBuffers(RHICmdList, Scene, LightPropagationVolume);
auto BeginShadowRenderPass = [this, LightPropagationVolume, ProjectedShadowInfo, &ColorTarget0, &ColorTarget1, &DepthTarget](FRHICommandList& InRHICmdList, bool bPerformClear)
{
FRHITexture* RenderTargets[2];
RenderTargets[0] = ColorTarget0.TargetableTexture;
RenderTargets[1] = ColorTarget1.TargetableTexture;
// Hook up the geometry volume UAVs
FRHITransitionInfo UAVTransitions[] = {
FRHITransitionInfo(LightPropagationVolume->GetGvListBufferUav(), ERHIAccess::Unknown, ERHIAccess::UAVMask),
FRHITransitionInfo(LightPropagationVolume->GetGvListHeadBufferUav(), ERHIAccess::Unknown, ERHIAccess::UAVMask),
FRHITransitionInfo(LightPropagationVolume->GetVplListBufferUav(), ERHIAccess::Unknown, ERHIAccess::UAVMask),
FRHITransitionInfo(LightPropagationVolume->GetVplListHeadBufferUav(), ERHIAccess::Unknown, ERHIAccess::UAVMask)
};
FRHIRenderPassInfo RPInfo(UE_ARRAY_COUNT(RenderTargets), RenderTargets, ERenderTargetActions::Load_Store);
RPInfo.DepthStencilRenderTarget.Action = EDepthStencilTargetActions::LoadDepthNotStencil_StoreDepthNotStencil;
RPInfo.DepthStencilRenderTarget.DepthStencilTarget = DepthTarget.TargetableTexture;
RPInfo.DepthStencilRenderTarget.ExclusiveDepthStencil = FExclusiveDepthStencil::DepthWrite_StencilNop;
InRHICmdList.Transition(MakeArrayView(UAVTransitions, UE_ARRAY_COUNT(UAVTransitions)));
TransitionRenderPassTargets(InRHICmdList, RPInfo);
InRHICmdList.BeginRenderPass(RPInfo, TEXT("ShadowAtlas"));
ProjectedShadowInfo->ClearDepth(InRHICmdList, this, UE_ARRAY_COUNT(RenderTargets), RenderTargets, DepthTarget.TargetableTexture, bPerformClear);
};
{
SCOPED_DRAW_EVENT(RHICmdList, Clear);
BeginShadowRenderPass(RHICmdList, true);
}
// In parallel mode the first renderpass is just the clear.
if (bDoParallelDispatch)
{
RHICmdList.EndRenderPass();
}
ProjectedShadowInfo->RenderDepth(RHICmdList, this, BeginShadowRenderPass, bDoParallelDispatch);
if (!bDoParallelDispatch)
{
RHICmdList.EndRenderPass();
}
{
// Resolve the shadow depth z surface.
RHICmdList.CopyToResolveTarget(DepthTarget.TargetableTexture, DepthTarget.ShaderResourceTexture, FResolveParams());
RHICmdList.CopyToResolveTarget(ColorTarget0.TargetableTexture, ColorTarget0.ShaderResourceTexture, FResolveParams());
RHICmdList.CopyToResolveTarget(ColorTarget1.TargetableTexture, ColorTarget1.ShaderResourceTexture, FResolveParams());
FRHITransitionInfo UavsToReadable[2];
UavsToReadable[0] = FRHITransitionInfo(LightPropagationVolume->GetGvListBufferUav(), ERHIAccess::Unknown, ERHIAccess::SRVMask);
UavsToReadable[1] = FRHITransitionInfo(LightPropagationVolume->GetGvListHeadBufferUav(), ERHIAccess::Unknown, ERHIAccess::SRVMask);
RHICmdList.Transition(MakeArrayView(UavsToReadable, UE_ARRAY_COUNT(UavsToReadable)));
}
checkSlow(RHICmdList.IsOutsideRenderPass());
}
}
checkSlow(RHICmdList.IsOutsideRenderPass());
}
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