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BlueRoseNote/03-UnrealEngine/Rendering/RenderingPipeline/Lighting/LightChannel实现.md

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Untitled 2024-10-16 14:39:40 ⭐

前言

Stencil相关

BasePass:绘制Stencil => CopyStencilToLightingChannels => ClearStencil (SceneDepthZ) :清空深度缓存中的Stencil

BasePass

BasePass中进行LIGHTING_CHANNELS、DISTANCE_FIELD_REPRESENTATION、贴花方面的Mask Bit计算，设置到深度缓存的Stencil上。

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);
	}
}