LightmapUniformShaderParameters.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Engine/EngineTypes.h"
#include "RenderResource.h"
#include "ShaderParameters.h"
#include "UniformBuffer.h"
#include "Containers/StaticArray.h"
 
class FLightCacheInterface;
 
inline constexpr int32 MAX_NUM_LIGHTMAP_COEF = 2;
 
BEGIN_GLOBAL_SHADER_PARAMETER_STRUCT(FPrecomputedLightingUniformParameters, ENGINE_API)
SHADER_PARAMETER(FVector4f, StaticShadowMapMasks) // TDistanceFieldShadowsAndLightMapPolicy
SHADER_PARAMETER(FVector4f, InvUniformPenumbraSizes) // TDistanceFieldShadowsAndLightMapPolicy
SHADER_PARAMETER(FVector4f, LightMapCoordinateScaleBias) // TLightMapPolicy
SHADER_PARAMETER(FVector4f, ShadowMapCoordinateScaleBias) // TDistanceFieldShadowsAndLightMapPolicy
SHADER_PARAMETER_ARRAY_EX(FVector4f, LightMapScale, [MAX_NUM_LIGHTMAP_COEF], EShaderPrecisionModifier::Half) // TLightMapPolicy
SHADER_PARAMETER_ARRAY_EX(FVector4f, LightMapAdd, [MAX_NUM_LIGHTMAP_COEF], EShaderPrecisionModifier::Half) // TLightMapPolicy
SHADER_PARAMETER_ARRAY(FUintVector4, LightmapVTPackedPageTableUniform, [2]) // VT (1 page table, 2x uint4)
SHADER_PARAMETER_ARRAY(FUintVector4, LightmapVTPackedUniform, [5]) // VT (5 layers, 1x uint4 per layer)
END_GLOBAL_SHADER_PARAMETER_STRUCT()
 
ENGINE_API void GetDefaultPrecomputedLightingParameters(FPrecomputedLightingUniformParameters& Parameters);
 
ENGINE_API void GetPrecomputedLightingParameters(
    ERHIFeatureLevel::Type FeatureLevel,
    FPrecomputedLightingUniformParameters& Parameters,
    const FLightCacheInterface* LCI);
 
struct FLightmapSceneShaderData
{
    // Must match usf
    enum { DataStrideInFloat4s = 15 };
 
    TStaticArray<FVector4f, DataStrideInFloat4s> Data;
 
    FLightmapSceneShaderData()
        : Data(InPlace, NoInit)
    {
        FPrecomputedLightingUniformParameters ShaderParameters;
        GetDefaultPrecomputedLightingParameters(ShaderParameters);
        Setup(ShaderParameters);
    }
 
    explicit FLightmapSceneShaderData(const FPrecomputedLightingUniformParameters& ShaderParameters)
        : Data(InPlace, NoInit)
    {
        Setup(ShaderParameters);
    }
 
    ENGINE_API FLightmapSceneShaderData(const class FLightCacheInterface* LCI, ERHIFeatureLevel::Type FeatureLevel);
 
    ENGINE_API void Setup(const FPrecomputedLightingUniformParameters& ShaderParameters);
};