VolumetricFog.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    VolumetricFog.h
=============================================================================*/
 
#pragma once
 
#include "RHIDefinitions.h"
#include "SceneView.h"
#include "SceneRendering.h"
 
extern int32 GetVolumetricFogGridPixelSize();
 
// Grid size for resource allocation to be independent of dynamic resolution
extern FIntVector GetVolumetricFogResourceGridSize(const FViewInfo& View, int32& OutVolumetricFogGridPixelSize);
// Grid size for the view rectangle within the allocated resource
extern FIntVector GetVolumetricFogViewGridSize(const FViewInfo& View, int32& OutVolumetricFogGridPixelSize);
 
extern FVector2f GetVolumetricFogUVMaxForSampling(const FVector2f& ViewRectSize, FIntVector VolumetricFogResourceGridSize, int32 VolumetricFogResourceGridPixelSize);
extern FVector2f GetVolumetricFogPrevUVMaxForTemporalBlend(const FVector2f& ViewRectSize, FIntVector VolumetricFogResourceGridSize, int32 VolumetricFogResourceGridPixelSize);
 
extern FVector2f GetVolumetricFogFroxelToScreenSVPosRatio(const FViewInfo& View);
 
extern FRDGTextureDesc GetVolumetricFogRDGTextureDesc(const FIntVector& VolumetricFogResourceGridSize);
 
extern bool DoesPlatformSupportVolumetricFogVoxelization(const FStaticShaderPlatform Platform);
extern bool ShouldRenderVolumetricFog(const FScene* Scene, const FSceneViewFamily& ViewFamily);
extern const FProjectedShadowInfo* GetShadowForInjectionIntoVolumetricFog(const FVisibleLightInfo& VisibleLightInfo);
 
extern bool LightNeedsSeparateInjectionIntoVolumetricFogForOpaqueShadow(const FViewInfo& View, const FLightSceneInfo* LightSceneInfo, const FVisibleLightInfo& VisibleLightInfo, const FScene& InScene);