ScaleMatrix.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Math/Plane.h"
#include "Math/Matrix.h"
 
namespace UE {
namespace Math {
 
/**
 * Scale matrix.
 */
template<typename T>
struct TScaleMatrix
    : public TMatrix<T>
{
public:
 
    /**
     * @param Scale uniform scale to apply to matrix.
     */
    TScaleMatrix( T Scale );
 
    /**
     * @param Scale Non-uniform scale to apply to matrix.
     */
    TScaleMatrix( const TVector<T>& Scale );
 
    // Conversion to other type.
    template<typename FArg, TEMPLATE_REQUIRES(!std::is_same_v<T, FArg>)>
    explicit TScaleMatrix(const TScaleMatrix<FArg>& From) : TMatrix<T>(From) {}
 
    /** Matrix factory. Return an TMatrix<T> so we don't have type conversion issues in expressions. */
    static TMatrix<T> Make(T Scale)
    {
        return TScaleMatrix<T>(Scale);
    }
 
    /** Matrix factory. Return an TMatrix<T> so we don't have type conversion issues in expressions. */
    static TMatrix<T> Make(const TVector<T>& Scale)
    {
        return TScaleMatrix<T>(Scale);
    }
};
 
 
/* FScaleMatrix inline functions
 *****************************************************************************/
 
template<typename T>
FORCEINLINE TScaleMatrix<T>::TScaleMatrix( T Scale )
    : TMatrix<T>(
        TPlane<T>(Scale,    0.0f,   0.0f,   0.0f),
        TPlane<T>(0.0f,     Scale,  0.0f,   0.0f),
        TPlane<T>(0.0f,     0.0f,   Scale,  0.0f),
        TPlane<T>(0.0f,     0.0f,   0.0f,   1.0f)
    )
{ }
 
 
template<typename T>
FORCEINLINE TScaleMatrix<T>::TScaleMatrix( const TVector<T>& Scale )
    : TMatrix<T>(
        TPlane<T>(Scale.X,  0.0f,       0.0f,       0.0f),
        TPlane<T>(0.0f,     Scale.Y,    0.0f,       0.0f),
        TPlane<T>(0.0f,     0.0f,       Scale.Z,    0.0f),
        TPlane<T>(0.0f,     0.0f,       0.0f,       1.0f)
    )
{ }
 
} // namespace Math
} // namespace UE
 
UE_DECLARE_LWC_TYPE(ScaleMatrix, 44);
 
template<> struct TIsUECoreVariant<FScaleMatrix44f> { enum { Value = true }; };
template<> struct TIsUECoreVariant<FScaleMatrix44d> { enum { Value = true }; };