VectorField.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*==============================================================================
    VectorField.h: Interface to vector fields.
==============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RenderResource.h"
 
class Error;
 
/*------------------------------------------------------------------------------
    Forward declarations.
------------------------------------------------------------------------------*/
 
class FPrimitiveDrawInterface;
class FSceneView;
class FVectorFieldVisualizationVertexFactory;
 
class FRHICommandListImmediate;
 
/*------------------------------------------------------------------------------
    Vector field delcarations.
------------------------------------------------------------------------------*/
 
#define VECTOR_FIELD_LOG_VERBOSITY Error
DECLARE_LOG_CATEGORY_EXTERN(LogVectorField,VECTOR_FIELD_LOG_VERBOSITY,VECTOR_FIELD_LOG_VERBOSITY);
 
class FVectorFieldResource : public FRenderResource
{
public:
 
    FTextureRHIRef VolumeTextureRHI;
    int32 SizeX;
    int32 SizeY;
    int32 SizeZ;
    float Intensity;
    FBox LocalBounds;
 
    FVectorFieldResource();
 
    virtual void ReleaseRHI() override;
 
    virtual void Update(FRHICommandListImmediate& RHICmdList, float DeltaSeconds) {}
 
    virtual void ResetVectorField() {}
 
 
    uint32 AddRef() const
    { 
        return (uint32)NumRefs.Increment(); 
    }
 
    uint32 Release() const
    {
        uint32 NewValue = (uint32)NumRefs.Decrement();
        if (NewValue == 0)
        {
            delete this;
        }
        return NewValue;
    }
 
protected:
 
    virtual ~FVectorFieldResource();
 
    mutable FThreadSafeCounter NumRefs;
};
 
class FVectorFieldInstance
{
public:
 
    TRefCountPtr<FVectorFieldResource> Resource;
    FBox WorldBounds;
    FMatrix VolumeToWorldNoScale;
    FMatrix WorldToVolume;
    FMatrix VolumeToWorld;
    float Tightness;
    float Intensity;
    int32 Index;
    uint32 bTileX : 1;
    uint32 bTileY : 1;
    uint32 bTileZ : 1;
    uint32 bUseFixDT : 1;
 
    FVectorFieldInstance()
        : Resource(NULL)
        , VolumeToWorldNoScale(FMatrix::Identity)
        , WorldToVolume(FMatrix::Identity)
        , VolumeToWorld(FMatrix::Identity)
        , Tightness(0.0f)
        , Intensity(0.0f)
        , Index(INDEX_NONE)
        , bTileX(false)
        , bTileY(false)
        , bTileZ(false)
        , bUseFixDT(false)
        , bInstancedResource(false)
    {
    }
 
    ~FVectorFieldInstance();
 
    void Init(FVectorFieldResource* InResource, bool bInstanced);
 
    void UpdateTransforms(const FMatrix& LocalToWorld);
 
private:
 
    bool bInstancedResource;
};
 
typedef TSparseArray<FVectorFieldInstance*> FVectorFieldInstanceList;