OrthoMatrix.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 {
 
 
template<typename T>
struct TOrthoMatrix
    : public TMatrix<T>
{
public:
 
    /**
     * Constructor
     *
     * @param Width view space width
     * @param Height view space height
     * @param ZScale scale in the Z axis
     * @param ZOffset offset in the Z axis
     */
    TOrthoMatrix(T Width,T Height,T ZScale,T ZOffset);
 
    // Conversion to other type.
    template<typename FArg, TEMPLATE_REQUIRES(!std::is_same_v<T, FArg>)>
    explicit TOrthoMatrix(const TOrthoMatrix<FArg>& From) : TMatrix<T>(From) {}
};
 
 
template<typename T>
struct TReversedZOrthoMatrix : public TMatrix<T>
{
public:
    TReversedZOrthoMatrix(T Width,T Height,T ZScale,T ZOffset);
    TReversedZOrthoMatrix(T Left, T Right, T Bottom, T Top, T ZScale, T ZOffset);
 
    // Conversion to other type.
    template<typename FArg, TEMPLATE_REQUIRES(!std::is_same_v<T, FArg>)>
    explicit TReversedZOrthoMatrix(const TReversedZOrthoMatrix<FArg>& From) : TMatrix<T>(From) {}
};
 
template<typename T>
FORCEINLINE TOrthoMatrix<T>::TOrthoMatrix(T Width, T Height, T ZScale, T ZOffset)
    : TMatrix<T>(
        TPlane<T>((Width != 0.0f) ? (1.0f / Width) : 1.0f, 0.0f, 0.0f, 0.0f),
        TPlane<T>(0.0f, (Height != 0.0f) ? (1.0f / Height) : 1.f, 0.0f, 0.0f),
        TPlane<T>(0.0f, 0.0f, ZScale, 0.0f),
        TPlane<T>(0.0f, 0.0f, ZOffset * ZScale, 1.0f)
    )
{ }
 
 
template<typename T>
FORCEINLINE TReversedZOrthoMatrix<T>::TReversedZOrthoMatrix(T Width, T Height, T ZScale, T ZOffset)
    : TMatrix<T>(
        TPlane<T>((Width != 0.0f) ? (1.0f / Width) : 1.0f, 0.0f, 0.0f, 0.0f),
        TPlane<T>(0.0f, (Height != 0.0f) ? (1.0f / Height) : 1.f, 0.0f, 0.0f),
        TPlane<T>(0.0f, 0.0f, -ZScale, 0.0f),
        TPlane<T>(0.0f, 0.0f, 1.0f - ZOffset * ZScale, 1.0f)
    )
{ }
 
template<typename T>
FORCEINLINE TReversedZOrthoMatrix<T>::TReversedZOrthoMatrix(T Left, T Right, T Bottom, T Top, T ZScale, T ZOffset)
    : TMatrix<T>(
        TPlane<T>(1.0f / (Right - Left), 0.0f, 0.0f, 0.0f),
        TPlane<T>(0.0f, 1.0f / (Top - Bottom), 0.0f, 0.0f),
        TPlane<T>(0.0f, 0.0f, -ZScale, 0.0f),
        TPlane<T>((Left + Right) / (Left - Right), (Top + Bottom) / (Bottom - Top), 1.0f - ZOffset * ZScale, 1.0f)
    )
{ }
 
 } // namespace Math
 } // namespace UE
 
UE_DECLARE_LWC_TYPE(OrthoMatrix, 44);
UE_DECLARE_LWC_TYPE(ReversedZOrthoMatrix, 44);
 
template<> struct TIsUECoreVariant<FOrthoMatrix44f> { enum { Value = true }; };
template<> struct TIsUECoreVariant<FOrthoMatrix44d> { enum { Value = true }; };
template<> struct TIsUECoreVariant<FReversedZOrthoMatrix44f> { enum { Value = true }; };
template<> struct TIsUECoreVariant<FReversedZOrthoMatrix44d> { enum { Value = true }; };