SparseVolumeTextureUtility.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "SparseVolumeTexture/SparseVolumeTexture.h"
 
namespace UE
{
namespace SVT
{
    // We are using this instead of GMaxVolumeTextureDimensions to be independent of the platform that
    // the asset is imported on. 2048 should be a safe value that should be supported by all our platforms.
    static constexpr int32 MaxVolumeTextureDim = 2048;
    static constexpr int64 MaxResourceSize = 2048LL * 1024LL * 1024LL;
    static constexpr int32 NumVoxelsPerTile = SPARSE_VOLUME_TILE_RES * SPARSE_VOLUME_TILE_RES * SPARSE_VOLUME_TILE_RES;
    static constexpr int32 NumVoxelsPerPaddedTile = SPARSE_VOLUME_TILE_RES_PADDED * SPARSE_VOLUME_TILE_RES_PADDED * SPARSE_VOLUME_TILE_RES_PADDED;
    static constexpr int32 NumOccupancyWordsPerPaddedTile = (NumVoxelsPerPaddedTile + 31) / 32;
    static constexpr int32 OccupancyBitsSizePerPaddedTile = NumOccupancyWordsPerPaddedTile * sizeof(uint32);
 
    uint32 PackX11Y11Z10(const FIntVector3& Value);
    uint32 PackPageTableEntry(const FIntVector3& Coord);
    FIntVector3 UnpackPageTableEntry(uint32 Packed);
    FVector4f ReadVoxel(int64 VoxelIndex, const uint8* TileData, EPixelFormat Format);
    void WriteVoxel(int64 VoxelIndex, uint8* TileData, EPixelFormat Format, const FVector4f& Value, int32 DstComponent = -1);
    bool IsSupportedFormat(EPixelFormat Format);
    // Returns true if Point >= Min && Point < Max for all components
    bool IsInBounds(const FIntVector3& Point, const FIntVector3& Min, const FIntVector3& Max);
    // Computes Max(Value >> ShiftBy, MinValue)
    FIntVector3 ShiftRightAndMax(const FIntVector3& Value, uint32 ShiftBy, int32 MinValue);
 
namespace Private
{
    // SVT_TODO: This really should be a shared function.
    template <typename Y, typename T>
    void SerializeEnumAs(FArchive& Ar, T& Target)
    {
        Y Buffer = static_cast<Y>(Target);
        Ar << Buffer;
        if (Ar.IsLoading())
        {
            Target = static_cast<T>(Buffer);
        }
    }
} // Private
 
} // SVT
} // UE