D3D12 Memory Alloc Question about d3d12memoryallocator HOT 5 CLOSED

when i create a uploaded buffer for texture uploaded and the buffer size is 6619136, the texture uploaded will failed because the Device->GetCopyableFootprints(&TextureDesc, 0, 1, 0, &Layouts, nullptr, &RowSizeInBytes, &RequiredSize); return RequiredSize is 6635344, I uploaded the texture using microsoft's sample code:UpdateSubresources, it will return when :IntermediateDesc.Width < RequiredSize + pLayouts[0].Offset.

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I means the value which GetResourceAllocationInfo return must larger than GetCopyableFootprints returns. and in my situation 6619136 is smaller than 6635520 , it doesn't work, and i don't know why.

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I soloved this in this way:
D3D12_RESOURCE_ALLOCATION_INFO Info; Info = Device->GetResourceAllocationInfo(0, 1, &TextureDesc); UINT64 RequiredSize = 0; UINT64 RowSizeInBytes = 0; D3D12_PLACED_SUBRESOURCE_FOOTPRINT Layouts; Device->GetCopyableFootprints(&TextureDesc, 0, 1, 0, &Layouts, nullptr, &RowSizeInBytes, &RequiredSize); if (RequiredSize > Info.SizeInBytes) { mTextureLen = ((int)RequiredSize + (int)Info.Alignment - 1) / (int)Info.Alignment * (int)Info.Alignment; } else { mTextureLen = (int)Info.SizeInBytes; }
But i can't ensure is the right way.

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D3D12_RESOURCE_ALLOCATION_INFO Info;
Info = Device->GetResourceAllocationInfo(0, 1, &TextureDesc);
UINT64 RequiredSize = 0;
UINT64 RowSizeInBytes = 0;
D3D12_PLACED_SUBRESOURCE_FOOTPRINT Layouts;
Device->GetCopyableFootprints(&TextureDesc, 0, 1, 0, &Layouts, nullptr, &RowSizeInBytes, &RequiredSize);
if (RequiredSize > Info.SizeInBytes)
{
	mTextureLen = ((int)RequiredSize + (int)Info.Alignment - 1) / (int)Info.Alignment * (int)Info.Alignment;
}
else
{
	mTextureLen = (int)Info.SizeInBytes;
}

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