PathTracing.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "PathTracingResources.h"
#include "ShaderParameterMacros.h"
#include "PathTracingOutputInvalidateReason.h"
 
// this struct holds skylight parameters
BEGIN_SHADER_PARAMETER_STRUCT(FPathTracingSkylight, )
    SHADER_PARAMETER_RDG_TEXTURE(Texture2D, SkylightTexture)
    SHADER_PARAMETER_RDG_TEXTURE(Texture2D, SkylightPdf)
    SHADER_PARAMETER_SAMPLER(SamplerState, SkylightTextureSampler)
    SHADER_PARAMETER(float, SkylightInvResolution)
    SHADER_PARAMETER(int32, SkylightMipCount)
END_SHADER_PARAMETER_STRUCT()
 
class FRDGBuilder;
class FScene;
class FViewInfo;
class FSceneViewFamily;
class FRHIRayTracingShader;
class FGlobalShaderMap;
 
bool PrepareSkyTexture(FRDGBuilder& GraphBuilder, FScene* Scene, const FViewInfo& View, bool SkylightEnabled, bool UseMISCompensation, FPathTracingSkylight* SkylightParameters);
RENDERER_API FRHIRayTracingShader* GetPathTracingDefaultMissShader(const FGlobalShaderMap* ShaderMap);
RENDERER_API FRHIRayTracingShader* GetPathTracingDefaultOpaqueHitShader(const FGlobalShaderMap* ShaderMap);
RENDERER_API FRHIRayTracingShader* GetPathTracingDefaultHiddenHitShader(const FGlobalShaderMap* ShaderMap);
 
RENDERER_API FRHIRayTracingShader* GetGPULightmassDefaultMissShader(const FGlobalShaderMap* ShaderMap);
RENDERER_API FRHIRayTracingShader* GetGPULightmassDefaultOpaqueHitShader(const FGlobalShaderMap* ShaderMap);
RENDERER_API FRHIRayTracingShader* GetGPULightmassDefaultHiddenHitShader(const FGlobalShaderMap* ShaderMap);
 
void PreparePathTracingRTPSO();
void PreparePathTracingCloudMaterial(FRDGBuilder& GraphBuilder, FScene* Scene, TArrayView<FViewInfo> Views);
 
namespace PathTracing
{
    bool ShouldCompilePathTracingShadersForProject(EShaderPlatform ShaderPlatform);
    bool UsesDecals(const FSceneViewFamily& ViewFamily);
    bool UsesReferenceAtmosphere(const FViewInfo& View);
    bool UsesReferenceDOF(const FViewInfo& View);
    bool NeedsAntiAliasing(const FViewInfo& View);
    bool NeedsTonemapping();
    bool IsOutputInvalidateAllowed(EInvalidateReason InvalidateReason);
}