65 lines
2.7 KiB
C
65 lines
2.7 KiB
C
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "ShaderParameters.h"
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#include "ShaderParameterMacros.h"
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#include "SceneRendering.h"
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#include "LightSceneInfo.h"
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#include "RayTracingDefinitions.h"
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#include "RayTracingTypes.h"
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#include "Containers/DynamicRHIResourceArray.h"
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#if RHI_RAYTRACING
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FRHIRayTracingShader* GetRayTracingLightingMissShader(const FGlobalShaderMap* ShaderMap);
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// This struct holds a light grid and list of raytracing lights for both building and rendering
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BEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FRayTracingLightGrid, RENDERER_API)
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SHADER_PARAMETER(uint32, SceneLightCount)
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SHADER_PARAMETER(uint32, SceneInfiniteLightCount)
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SHADER_PARAMETER(FVector3f, SceneLightsTranslatedBoundMin)
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SHADER_PARAMETER(FVector3f, SceneLightsTranslatedBoundMax)
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SHADER_PARAMETER_RDG_BUFFER_SRV(StructuredBuffer<FRTLightingData>, SceneLights)
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SHADER_PARAMETER_RDG_TEXTURE(Texture2DArray<uint>, LightGrid)
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SHADER_PARAMETER_RDG_BUFFER_SRV(Buffer<uint>, LightGridData)
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SHADER_PARAMETER(unsigned, LightGridResolution)
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SHADER_PARAMETER(unsigned, LightGridMaxCount)
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SHADER_PARAMETER(unsigned, LightGridAxis)
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END_GLOBAL_SHADER_PARAMETER_STRUCT()
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using FRayTracingLightFunctionMap = TMap<const FLightSceneInfo*, int32>;
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// Register this in the graph builder so we can easily move it around and access it from both the main rendering thread and RDG passes
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RDG_REGISTER_BLACKBOARD_STRUCT(FRayTracingLightFunctionMap)
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FRayTracingLightFunctionMap GatherLightFunctionLights(FScene* Scene, const FEngineShowFlags EngineShowFlags, ERHIFeatureLevel::Type InFeatureLevel);
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FRayTracingLightFunctionMap GatherLightFunctionLightsPathTracing(FScene* Scene, const FEngineShowFlags EngineShowFlags, ERHIFeatureLevel::Type InFeatureLevel);
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TRDGUniformBufferRef<FRayTracingLightGrid> CreateRayTracingLightData(
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FRDGBuilder& GraphBuilder,
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const FScene* Scene,
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const FSceneView& View,
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FGlobalShaderMap* ShaderMap,
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bool bBuildLightGrid);
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void BindLightFunctionShaders(
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FRHICommandList& RHICmdList,
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const FScene* Scene,
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const FRayTracingLightFunctionMap* RayTracingLightFunctionMap,
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const class FViewInfo& View);
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void BindLightFunctionShadersPathTracing(
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FRHICommandList& RHICmdList,
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const FScene* Scene,
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const FRayTracingLightFunctionMap* RayTracingLightFunctionMap,
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const class FViewInfo& View);
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// Helper routines, useful when building a light grid
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FBox3f GetPointLightBounds(const FVector3f& Center, float Radius);
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FBox3f GetSpotLightBounds(const FVector3f& Center, const FVector3f& Normal, float Radius, float CosOuter);
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FBox3f GetRectLightBounds(const FVector3f& Center, const FVector3f& Normal, const FVector3f& Tangent, float HalfWidth, float HalfHeight, float Radius, float BarnCos, float BarnLen);
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#endif
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