// 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);