UVPacking.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "BoxTypes.h"
#include "Containers/Array.h"
#include "IndexTypes.h"
#include "Math/UnrealMathSSE.h"
#include "Math/Vector2D.h"
#include "VectorTypes.h"
 
template <typename FuncType> class TFunctionRef;
 
namespace UE
{
namespace Geometry
{
 
class FUVPacker
{
public:
 
    // abstract interface to apply UV packer a mesh
    struct IUVMeshView
    {
        virtual ~IUVMeshView() {}
        virtual FIndex3i GetTriangle(int32 TID) const = 0;
        virtual FIndex3i GetUVTriangle(int32 TID) const = 0;
        virtual FVector3d GetVertex(int32 VID) const = 0;
        virtual FVector2f GetUV(int32 EID) const = 0;
        virtual void SetUV(int32 EID, FVector2f UV) = 0;
    };
    
 
    int32 TextureResolution = 512;
 
    float GutterSize = 1.0;
 
    bool bPreserveScale = false;
 
    bool bPreserveRotation = false;
 
    bool bAllowFlips = false;
 
    bool bScaleIslandsByWorldSpaceTexelRatio = false;
 
    GEOMETRYCORE_API bool StandardPack(IUVMeshView* Mesh, int NumIslands, TFunctionRef<void(int, TArray<int32>&)> CopyIsland);
 
    bool StandardPack(IUVMeshView* Mesh, const TArray<TArray<int>>& UVIslands)
    {
        return StandardPack(Mesh, UVIslands.Num(), [&UVIslands](int Idx, TArray<int32>& IslandOut)
            {
                IslandOut = UVIslands[Idx];
            });
    }
 
    GEOMETRYCORE_API bool StackPack(IUVMeshView* Mesh, int NumIslands, TFunctionRef<void(int, TArray<int32>&)> CopyIsland);
 
    bool StackPack(IUVMeshView* Mesh, const TArray<TArray<int>>& UVIslands)
    {
        return StackPack(Mesh, UVIslands.Num(), [&UVIslands](int Idx, TArray<int32>& IslandOut)
            {
                IslandOut = UVIslands[Idx];
            });
    }
 
protected:
 
    GEOMETRYCORE_API void GetIslandStats(IUVMeshView* Mesh, const TArray<int32>& Island, FAxisAlignedBox2d& IslandBoundsOut, double& IslandScaleFactorOut, double& UVAreaOut);
 
};
 
 
} // end namespace UE::Geometry
} // end namespace UE