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