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  3. FScreenTransform

FScreenTransform

Generic affine 2D texture coordinate transformation x * S + B.

API > API/Runtime > API/Runtime/Renderer

Generic affine 2D texture coordinate transformation x * S + B.

Construct: FVector2f PointInA = ...; FVector2f PointInB = PointInA * Scale0 + Bias0;

FScreenTransform AToB(Scale0, Bias0); FVector2f PointInB = PointInA * AToB;

Associativity: FVector2f PointInA = ...; FScreenTransform AToB = ...; FScreenTransform BToC = ...; FVector2f PointInC = (PointInA * AToB) * BToC;

FScreenTransform AToC = AToB * BToC; FVector2f PointInC = PointInA * AToC;

Explicit construction by factorization: FVector2f PointInA = ...; FVector2f PointInB = PointInA * Scale0 + Bias0; FVector2f PointInC = PointInB * Scale1 + Bias1;

FScreenTransform AToC = (FScreenTransform::Identity * Scale0 + Bias0) * Scale1 + Bias1; FVector2f PointInC = PointInA * AToC;

Shader code: #include "/Engine/Private/ScreenPass.ush"

FScreenTransform AToC; // shader parameter in global scope

{ float2 PointInA = ...; float2 PointInC = ApplyScreenTransform(PointInA, AToC); }

   
Name FScreenTransform
Type struct
Header File /Engine/Source/Runtime/Renderer/Public/ScreenPass.h
Include Path #include "ScreenPass.h"

Syntax

struct FScreenTransform

Constructors

Name Remarks Include Path Unreal Specifiers
  ScreenPass.h  

FScreenTransform ( const FVector2f& InScale,
const FVector2f& InBias
)

   ScreenPass.h  

Enums

Public

Name Remarks
ETextureBasis Different texture coordinate basis.

Constants

Name Type Remarks Include Path
Identity const FScreenTransform A * FScreenTransform::Identity = A. ScreenPass.h
ScreenPosToViewportUV const FScreenTransform Transforms ScreenPos to/from ViewportUV. ScreenPass.h
ViewportUVToScreenPos const FScreenTransform   ScreenPass.h

Variables

Public

Name Type Remarks Include Path Unreal Specifiers
Bias FVector2f   ScreenPass.h  
Scale FVector2f   ScreenPass.h  

Functions

Public

Static

Name Remarks Include Path Unreal Specifiers

static FScreenTransform ChangeRectFromTo ( const FIntRect& SrcViewport,
const FIntRect& DestViewport
)

   ScreenPass.h  

static FScreenTransform ChangeRectFromTo ( FVector2f SourceOffset,
FVector2f SourceExtent,
FVector2f DestinationOffset,
FVector2f DestinationExtent
)

 Change of coordinate to map from a rectangle to another. ScreenPass.h  
  ScreenPass.h  
  ScreenPass.h  

static FScreenTransform ChangeTextureBasisFromTo ( const FIntPoint& TextureExtent,
const FIntRect& TextureViewport,
ETextureBasis SrcBasis,
ETextureBasis DestBasis
)

 Change of basis for texture coordinate. ScreenPass.h  

static FScreenTransform ChangeTextureUVCoordinateFromTo ( const FScreenPassTextureViewport& SrcViewport,
const FScreenPassTextureViewport& DestViewport
)

 Change TextureUV coordinate from one texture to another, taking into account change in texture extent too. ScreenPass.h  

static FScreenTransform DispatchThreadIdToViewportUV ( const FIntRect& SrcViewport
)

   ScreenPass.h  

static FScreenTransform Invert ( const FScreenTransform& AToB
)

 Invert a transformation AToB to BToA. ScreenPass.h  

static FScreenTransform SvPositionToViewportUV ( const FIntRect& SrcViewport
)

   ScreenPass.h  

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