RHIValidationUtils.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Misc/Build.h"
 
#if ENABLE_RHI_VALIDATION
 
#include "RHIResources.h"
#include "RHICommandList.h"
 
class FValidationRHIUtils
{
public:
    static void ValidateCopyTexture(FRHITexture* SourceTexture, FRHITexture* DestTexture, const FRHICopyTextureInfo& CopyInfo)
    {
        check(SourceTexture);
        check(DestTexture);
 
        const EPixelFormat SrcFormat = SourceTexture->GetFormat();
        const EPixelFormat DstFormat = DestTexture->GetFormat();
        const bool bIsSrcBlockCompressed = GPixelFormats[SrcFormat].BlockSizeX > 1;
        const bool bIsDstBlockCompressed = GPixelFormats[DstFormat].BlockSizeX > 1;
        const int32 SrcBlockBytes = GPixelFormats[SrcFormat].BlockBytes;
        const int32 DstBlockBytes = GPixelFormats[DstFormat].BlockBytes;
        const bool bValidCopyFormats = (SrcFormat == DstFormat) || (!bIsSrcBlockCompressed && bIsDstBlockCompressed && SrcBlockBytes == DstBlockBytes);
 
        checkf(bValidCopyFormats, TEXT("Some RHIs do not support this format conversion by the GPU for transfer operations!"));
 
        FIntVector SrcSize = SourceTexture->GetMipDimensions(CopyInfo.SourceMipIndex);
        FIntVector DestSize = DestTexture->GetMipDimensions(CopyInfo.DestMipIndex);
        FIntVector CopySize = CopyInfo.Size;
        if (CopySize == FIntVector::ZeroValue)
        {
            CopySize = SrcSize;
        }
 
        checkf(CopySize.X <= DestSize.X && CopySize.Y <= DestSize.Y, TEXT("Some RHIs can't perform scaling operations [%dx%d to %dx%d] during copies!"), SrcSize.X, SrcSize.Y, DestSize.X, DestSize.Y);
 
        check(CopyInfo.SourcePosition.X >= 0 && CopyInfo.SourcePosition.Y >= 0 && CopyInfo.SourcePosition.Z >= 0);
        check(CopyInfo.SourcePosition.X + CopySize.X <= SrcSize.X && CopyInfo.SourcePosition.Y + CopySize.Y <= SrcSize.Y);
 
        check(CopyInfo.DestPosition.X >= 0 && CopyInfo.DestPosition.Y >= 0 && CopyInfo.DestPosition.Z >= 0);
        check(CopyInfo.DestPosition.X + CopySize.X <= DestSize.X && CopyInfo.DestPosition.Y + CopySize.Y <= DestSize.Y);
 
        if (SourceTexture->GetTexture3D() && DestTexture->GetTexture3D())
        {
            check(CopyInfo.SourcePosition.Z + CopySize.Z <= SrcSize.Z);
            check(CopyInfo.DestPosition.Z + CopySize.Z <= DestSize.Z);
        }
    }
};
 
#endif // ENABLE_RHI_VALIDATION