DistanceFieldDownsampling.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    DistanceFieldDownsampling.h
=============================================================================*/
 
#pragma once
 
#include "RHI.h"
 
class FRHICommandListImmediate;
class FRDGBuilder;
 
struct FDistanceFieldDownsamplingDataTask
{
    FTextureRHIRef VolumeTextureRHI;
    FVector TexelSrcSize;
    FIntVector DstSize;
    FIntVector OffsetInAtlas;
};
 
class FDistanceFieldDownsampling
{
public:
    static ENGINE_API bool CanDownsample();
    static ENGINE_API void GetDownsampledSize(const FIntVector& Size, float Factor, FIntVector& OutDownsampledSize);
    static ENGINE_API void FillDownsamplingTask(const FIntVector& SrcSize, const FIntVector& DstSize, const FIntVector& OffsetInAtlas, EPixelFormat Format, FDistanceFieldDownsamplingDataTask& OutDataTask, FUpdateTexture3DData& OutTextureUpdateData);
    static ENGINE_API void DispatchDownsampleTasks(FRDGBuilder& GraphBuilder, FRHIUnorderedAccessView* DFAtlasUAV, ERHIFeatureLevel::Type FeatureLevel, TArray<FDistanceFieldDownsamplingDataTask>& DownsamplingTasks, TArray<FUpdateTexture3DData>& UpdateTextureData);
 
    UE_DEPRECATED(5.0, "This method has been refactored to use an FRDGBuilder instead.")
    static ENGINE_API void DispatchDownsampleTasks(FRHICommandListImmediate& RHICmdList, FRHIUnorderedAccessView* DFAtlasUAV, ERHIFeatureLevel::Type FeatureLevel, TArray<FDistanceFieldDownsamplingDataTask>& DownsamplingTasks, TArray<FUpdateTexture3DData>& UpdateTextureData);
};