SceneTextureReductions.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "PixelFormat.h"
#include "RenderGraphFwd.h"
#include "RHIFwd.h"
#include "Math/Vector4.h"
 
namespace Froxel
{
    struct FViewData;
}
 
struct FBuildHZBAsyncComputeParams
{
    FRDGPassRef Prerequisite = nullptr;
};
 
static constexpr EPixelFormat BuildHZBDefaultPixelFormat = PF_R16F;
 
struct FExtraParameters
{
    FVector4f InvDeviceZToWorldZTransform = FVector4f(0.0f, 0.0f, 1.0f, 0.0f);
    float SceneDepthBias = 0.0f;
    bool bLevel0Unscaled = false;
};
 
void BuildHZB(
    FRDGBuilder& GraphBuilder,
    FRDGTextureRef SceneDepth,
    FRDGTextureRef VisBufferTexture,
    const FIntRect ViewRect,
    ERHIFeatureLevel::Type FeatureLevel,
    EShaderPlatform ShaderPlatform,
    const TCHAR* ClosestHZBName,
    FRDGTextureRef* OutClosestHZBTexture,
    const TCHAR* FurthestHZBName,
    FRDGTextureRef* OutFurthestHZBTexture,
    EPixelFormat Format = BuildHZBDefaultPixelFormat,
    const FBuildHZBAsyncComputeParams* AsyncComputeParams = nullptr,
    const Froxel::FViewData* OutFroxelData = nullptr,
    FExtraParameters ExtraParameters = {});
 
 
// Build only the furthest HZB
void BuildHZBFurthest(
    FRDGBuilder& GraphBuilder,
    FRDGTextureRef SceneDepth,
    FRDGTextureRef VisBufferTexture,
    const FIntRect ViewRect,
    ERHIFeatureLevel::Type FeatureLevel,
    EShaderPlatform ShaderPlatform,
    const TCHAR* FurthestHZBName,
    FRDGTextureRef* OutFurthestHZBTexture,
    EPixelFormat Format = BuildHZBDefaultPixelFormat,
    const FBuildHZBAsyncComputeParams* AsyncComputeParams = nullptr,
    FExtraParameters ExtraParameters = {});