DistortionRendering.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    DistortionRendering.h: Distortion rendering implementation.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RendererInterface.h"
#include "MeshPassProcessor.h"
 
class FPrimitiveSceneProxy;
struct FMeshPassProcessorRenderState;
 
class FDistortionPrimSet
{
public:
 
    bool DrawAccumulatedOffsets(FRHICommandListImmediate& RHICmdList, const class FViewInfo& View, const FMeshPassProcessorRenderState& DrawRenderState, bool bInitializeOffsets);
 
    void Append(FPrimitiveSceneProxy** PrimitiveSceneProxies, int32 NumProxies)
    {
        Prims.Append(PrimitiveSceneProxies, NumProxies);
    }
 
    int32 NumPrims() const
    {
        return Prims.Num();
    }
 
    const FPrimitiveSceneProxy* GetPrim(int32 i)const
    {
        check(i>=0 && i<NumPrims());
        return Prims[i];
    }
 
private:
    TArray<FPrimitiveSceneProxy*, SceneRenderingAllocator> Prims;
};
 
extern void SetupDistortionParams(FVector4f& DistortionParams, const FViewInfo& View);
 
class FDistortionMeshProcessor : public FSceneRenderingAllocatorObject<FDistortionMeshProcessor>, public FMeshPassProcessor
{
public:
 
    FDistortionMeshProcessor(
        const FScene* Scene, 
        ERHIFeatureLevel::Type FeatureLevel,
        const FSceneView* InViewIfDynamicMeshCommand, 
        const FMeshPassProcessorRenderState& InPassDrawRenderState, 
        const FMeshPassProcessorRenderState& InDistortionPassStateNoDepthTest,
        FMeshPassDrawListContext* InDrawListContext);
 
    virtual void AddMeshBatch(const FMeshBatch& RESTRICT MeshBatch, uint64 BatchElementMask, const FPrimitiveSceneProxy* RESTRICT PrimitiveSceneProxy, int32 StaticMeshId = -1) override final;
    virtual void CollectPSOInitializers(const FSceneTexturesConfig& SceneTexturesConfig, const FMaterial& Material, const FPSOPrecacheVertexFactoryData& VertexFactoryData, const FPSOPrecacheParams& PreCacheParams, TArray<FPSOPrecacheData>& PSOInitializers) override final;
 
    FMeshPassProcessorRenderState PassDrawRenderState;
    FMeshPassProcessorRenderState PassDrawRenderStateNoDepthTest;
 
private:
    bool TryAddMeshBatch(
        const FMeshBatch& RESTRICT MeshBatch,
        uint64 BatchElementMask,
        const FPrimitiveSceneProxy* RESTRICT PrimitiveSceneProxy,
        int32 StaticMeshId,
        const FMaterialRenderProxy& MaterialRenderProxy,
        const FMaterial& Material);
 
    bool Process(
        const FMeshBatch& MeshBatch,
        uint64 BatchElementMask,
        const FPrimitiveSceneProxy* RESTRICT PrimitiveSceneProxy,
        int32 StaticMeshId,
        const FMaterialRenderProxy& RESTRICT MaterialRenderProxy,
        const FMaterial& RESTRICT MaterialResource,
        ERasterizerFillMode MeshFillMode,
        ERasterizerCullMode MeshCullMode);
};