RectLightTextureManager.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "CoreMinimal.h"
#include "RHIDefinitions.h"
#include "RenderGraphDefinitions.h"
 
class FRHITexture;
class UTexture;
class FViewInfo;
 
namespace RectLightAtlas
{
// Atlas slot description in terms of UV coordinates
struct FAtlasSlotDesc
{
    FVector2f UVOffset;
    FVector2f UVScale;
    float MaxMipLevel;
};
    
// Add a rect light source texture to the atlas
RENDERER_API uint32 AddTexture(UTexture* Texture, const FVector4f& ScaleOffset = FVector4f::One());
 
// Remove a rect light source texture from the atlas
RENDERER_API void RemoveTexture(uint32 InSlotId);
 
// Return the atlas coordinate for a particular slot
RENDERER_API FAtlasSlotDesc GetAtlasSlot(uint32 InSlotId);
 
// Return the atlas texture
RENDERER_API FRHITexture* GetAtlasTexture();
 
// Update the rect light atlas texture
RENDERER_API void UpdateAtlasTexture(FRDGBuilder& GraphBuilder, const ERHIFeatureLevel::Type FeatureLevel);
 
// Return the rect light atlas debug pass
RENDERER_API void AddDebugPass(FRDGBuilder& GraphBuilder, const FViewInfo& View, FRDGTextureRef OutputTexture);
 
}