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03-UnrealEngine/Rendering/RenderingPipeline/Materials/MeshDraw.md
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@ -32,6 +32,73 @@ PS.使用的Shader必须是`FNaniteGlobalShader`的子类。
DrawNaniteMaterialPass() => SubmitNaniteIndirectMaterial()
## DepthStencil
***TStaticDepthStencilState***
- RDG 04 Graphics Pipeline State Initializer https://zhuanlan.zhihu.com/p/582020846
```c++
DrawRenderState.SetDepthStencilState(TStaticDepthStencilState<false, CF_Equal>::GetRHI());
template<bool bDepthTest, ECompareFunction CompareFunction, uint32 StencilWriteMask>
void SetDepthStencilStateForBasePass_Internal(FMeshPassProcessorRenderState& InDrawRenderState)
{
InDrawRenderState.SetDepthStencilState(TStaticDepthStencilState<
bDepthTest, CompareFunction,
true, CF_Always, SO_Keep, SO_Keep, SO_Replace,
false, CF_Always, SO_Keep, SO_Keep, SO_Keep,
0xFF, StencilWriteMask>::GetRHI());
}
template<bool bDepthTest, ECompareFunction CompareFunction>
void SetDepthStencilStateForBasePass_Internal(FMeshPassProcessorRenderState& InDrawRenderState, ERHIFeatureLevel::Type FeatureLevel)
{
const static bool bStrataDufferPassEnabled = Strata::IsStrataEnabled() && Strata::IsDBufferPassEnabled(GShaderPlatformForFeatureLevel[FeatureLevel]);
if (bStrataDufferPassEnabled)
{
SetDepthStencilStateForBasePass_Internal<bDepthTest, CompareFunction, GET_STENCIL_BIT_MASK(STRATA_RECEIVE_DBUFFER_NORMAL, 1) | GET_STENCIL_BIT_MASK(STRATA_RECEIVE_DBUFFER_DIFFUSE, 1) | GET_STENCIL_BIT_MASK(STRATA_RECEIVE_DBUFFER_ROUGHNESS, 1) | GET_STENCIL_BIT_MASK(DISTANCE_FIELD_REPRESENTATION, 1) | STENCIL_LIGHTING_CHANNELS_MASK(0x7)>(InDrawRenderState);
}
else
{
SetDepthStencilStateForBasePass_Internal<bDepthTest, CompareFunction, GET_STENCIL_BIT_MASK(RECEIVE_DECAL, 1) | GET_STENCIL_BIT_MASK(DISTANCE_FIELD_REPRESENTATION, 1) | STENCIL_LIGHTING_CHANNELS_MASK(0x7)>(InDrawRenderState);
}
}
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);
}
}
```
### InitCustomDepthStencilContext()
根据当前平台是否支持使用ComputeShader直接输出结果（bComputeExport）、以及是否写入Stencil缓存，以此来创建不同的资源。最终输出FCustomDepthContext。
```c++