FirstPersonSelfShadow.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "RendererInterface.h"
#include "RenderGraphResources.h"
 
class FSceneRendererBase;
class FLightSceneInfo;
struct FMinimalSceneTextures;
 
// Light independent inputs required for rendering first person self-shadow.
struct FFirstPersonSelfShadowInputs
{
    struct FDownsampledTextures
    {
        FIntPoint Resolution = FIntPoint::ZeroValue;
        FRDGTextureRef Normals = nullptr;
        FRDGTextureRef DepthStencil = nullptr;
    };
    const FMinimalSceneTextures* SceneTextures = nullptr;
    TArray<FDownsampledTextures, TInlineAllocator<4>> DownsampledInputs;
};
 
// Whether to render first person self-shadow at all.
bool ShouldRenderFirstPersonSelfShadow(const FSceneViewFamily& ViewFamily);
 
// Whether the light could cast first person self-shadow. This is similar in spirit to calling Casts*Shadow() on the light proxy
// and does not check for other conditions unrelated to the light itself, such as whether it is relevant for a given view or
// if the current platform and configuration supports first person self-shadow at all. For these cases, consider calling
// ShouldRenderFirstPersonSelfShadowForLight instead.
bool LightCastsFirstPersonSelfShadow(const FLightSceneInfo& LightSceneInfo);
 
// Whether to render first person self-shadow for a particular light.
bool ShouldRenderFirstPersonSelfShadowForLight(const FSceneRendererBase& SceneRenderer, const FSceneViewFamily& ViewFamily, const TArray<FViewInfo>& Views, const FLightSceneInfo& LightSceneInfo);
 
// Creates the required light independent inputs for RenderFirstPersonSelfShadow().
FFirstPersonSelfShadowInputs CreateFirstPersonSelfShadowInputs(FRDGBuilder& GraphBuilder, const TArray<FViewInfo>& Views, const FMinimalSceneTextures& SceneTextures);
 
// Renders first person self-shadow for the passed in light to the given ScreenShadowMaskTexture. Self-shadow is achieved by doing screen space shadow traces for first person pixels in the GBuffer.
void RenderFirstPersonSelfShadow(FRDGBuilder& GraphBuilder, const FSceneRendererBase& SceneRenderer, const TArray<FViewInfo>& Views, FRDGTextureRef ScreenShadowMaskTexture, const FFirstPersonSelfShadowInputs& Inputs, const FLightSceneInfo& LightSceneInfo);