MegaLights.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "SceneView.h"
#include "CoreMinimal.h"
#include "Engine/EngineTypes.h"
 
class FSceneViewFamily;
struct FGlobalShaderPermutationParameters;
enum EShaderPlatform : uint16;
class FRDGTexture;
using FRDGTextureRef = FRDGTexture*;
 
struct FScreenMessageWriter;
 
namespace ECastRayTracedShadow
{
    enum Type : int;
};
 
namespace StochasticLighting
{
    enum class EMaterialSource;
}
 
class FMegaLightsVolume
{
public:
    FRDGTextureRef Texture = nullptr;
    FRDGTextureRef TranslucencyAmbient[TVC_MAX] = {};
    FRDGTextureRef TranslucencyDirectional[TVC_MAX] = {};
};
 
enum class EMegaLightsMode
{
    Disabled,
    EnabledRT,
    EnabledVSM
};
 
// Public MegaLights interface
namespace MegaLights
{
    bool IsEnabled(const FSceneViewFamily& ViewFamily);
 
    bool IsUsingClosestHZB(const FSceneViewFamily& ViewFamily);
    bool IsUsingGlobalSDF(const FSceneViewFamily& ViewFamily);
    bool IsUsingLightFunctions(const FSceneViewFamily& ViewFamily);
    bool IsUsingLightingChannels();
 
    bool IsSoftwareRayTracingSupported(const FSceneViewFamily& ViewFamily);
    bool IsHardwareRayTracingSupported(const FSceneViewFamily& ViewFamily);
 
    EMegaLightsMode GetMegaLightsMode(const FSceneViewFamily& ViewFamily, uint8 LightType, bool bLightAllowsMegaLights, TEnumAsByte<EMegaLightsShadowMethod::Type> ShadowMethod);
    bool UseHardwareRayTracing(const FSceneViewFamily& ViewFamily);
    bool UseInlineHardwareRayTracing(const FSceneViewFamily& ViewFamily);
    bool ShouldCompileShaders(EShaderPlatform ShaderPlatform);
    bool ShouldCompileShadersForReferenceMode(EShaderPlatform ShaderPlatform);
 
    bool UseFarField(const FSceneViewFamily& ViewFamily);
 
    bool UseVolume();
 
    bool UseTranslucencyVolume();
    bool IsTranslucencyVolumeSpatialFilterEnabled();
    bool IsTranslucencyVolumeTemporalFilterEnabled();
 
    bool IsMarkingVSMPages();
 
    uint32 GetSampleMargin();
 
    bool HasWarning(const FSceneViewFamily& ViewFamily);
    void WriteWarnings(const FSceneViewFamily& ViewFamily, FScreenMessageWriter& Writer);
 
    BEGIN_SHADER_PARAMETER_STRUCT(FTileClassifyParameters, )
        SHADER_PARAMETER(uint32, EnableTexturedRectLights)
    END_SHADER_PARAMETER_STRUCT()
 
    void SetupTileClassifyParameters(const FViewInfo& View, MegaLights::FTileClassifyParameters& OutParameters);
 
    FIntPoint GetDownsampleFactorXY(StochasticLighting::EMaterialSource MaterialSource, EShaderPlatform ShaderPlatform);
};