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46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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PostProcessHistogram.h: Post processing histogram implementation.
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=============================================================================*/
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#pragma once
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#include "CoreMinimal.h"
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#include "RendererInterface.h"
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#include "PostProcess/RenderingCompositionGraph.h"
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// derives from TRenderingCompositePassBase<InputCount, OutputCount>
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class FRCPassPostProcessHistogram : public TRenderingCompositePassBase<1, 1>
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{
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public:
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// interface FRenderingCompositePass ---------
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virtual void Process(FRenderingCompositePassContext& Context) override;
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virtual void Release() override { delete this; }
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virtual FPooledRenderTargetDesc ComputeOutputDesc(EPassOutputId InPassOutputId) const override;
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// -------------------------------------------
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// changing this number require Histogram.usf to be recompiled
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static const uint32 ThreadGroupSizeX = 8;
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// changing this number require Histogram.usf to be recompiled
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static const uint32 ThreadGroupSizeY = 8;
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static const uint32 HistogramSize = 64;
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// /4 as we store 4 buckets in one ARGB texel
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static const uint32 HistogramTexelCount = HistogramSize / 4;
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// one ThreadGroup processes LoopCountX*LoopCountY blocks of size ThreadGroupSizeX*ThreadGroupSizeY
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// changing this number require Histogram.usf to be recompiled
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static const uint32 LoopCountX = 8;
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// changing this number require Histogram.usf to be recompiled
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static const uint32 LoopCountY = 8;
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// -------------------------------------------
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static FIntPoint ComputeGatherExtent(const FSceneView& View);
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static FIntPoint ComputeThreadGroupCount(FIntPoint PixelExtent);
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};
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