HairStrandsUtils.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    HairStrandsUtils.h: Hair strands utils.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RendererInterface.h"
#include "HairStrandsInterface.h"
#include "SceneTypes.h"
#include "HairStrandsData.h"
 
class FViewInfo;
 
FMinHairRadiusAtDepth1 ComputeMinStrandRadiusAtDepth1(
    const FIntPoint& Resolution,
    const float FOV,
    const uint32 SampleCount,
    const float OverrideStrandHairRasterizationScale,
    const float OrthoWidth = 0.0f);
 
FIntRect ComputeProjectedScreenRect(const FBox& B, const FViewInfo& View);
 
void ComputeTranslatedWorldToLightClip(
    const FVector& TranslatedWorldOffset,
    FMatrix& OutTranslatedWorldToClipTransform,
    FMinHairRadiusAtDepth1& OutMinStrandRadiusAtDepth1,
    const FBoxSphereBounds& PrimitivesBounds,
    const class FLightSceneProxy& LightProxy,
    const ELightComponentType LightType,
    const FIntPoint& ShadowResolution);
 
struct FHairComponent
{
    bool R = true;
    bool TT = true;
    bool TRT = true;
    bool GlobalScattering = true;
    bool LocalScattering = true;
    bool TTModel = false;
};
FHairComponent GetHairComponents();
uint32 ToBitfield(const FHairComponent& Component);
 
float GetHairDualScatteringRoughnessOverride();
 
float SampleCountToSubPixelSize(uint32 SamplePerPixelCount);
 
FIntRect ComputeVisibleHairStrandsMacroGroupsRect(const FViewInfo& View, const FIntRect& ViewRect, const FHairStrandsMacroGroupDatas& Datas);
 
bool IsHairStrandsViewRectOptimEnable();
 
uint32 GetVendorOptimalGroupSize1D();
FIntPoint GetVendorOptimalGroupSize2D();
 
enum class  EHairStrandsCompositionType : uint8
{
    BeforeTranslucent,
    AfterTranslucent,
    AfterSeparateTranslucent,
    AfterTranslucentBeforeTranslucentAfterDOF
};
 
EHairStrandsCompositionType GetHairStrandsComposition();
 
FVector4f PackHairRenderInfo(
    float PrimaryRadiusAtDepth1,
    float StableRadiusAtDepth1,
    float VelocityRadiusAtDepth1,
    float VelocityScale);
 
uint32 PackHairRenderInfoBits(
    bool bIsOrtho,
    bool bIsGPUDriven);