Improved logic in AllocatorPimpl::GetResourceAllocationInfo

See #83

Author: sawickiap

src/D3D12MemAlloc.cpp

@@ -215,6 +215,7 @@ static const D3D12_HEAP_FLAGS RESOURCE_CLASS_HEAP_FLAGS =
 static const D3D12_RESIDENCY_PRIORITY D3D12_RESIDENCY_PRIORITY_NONE = D3D12_RESIDENCY_PRIORITY(0);
 
 static const D3D12_HEAP_TYPE D3D12_HEAP_TYPE_GPU_UPLOAD_COPY = (D3D12_HEAP_TYPE)5;
+static const D3D12_RESOURCE_FLAGS D3D12_RESOURCE_FLAG_USE_TIGHT_ALIGNMENT_COPY = (D3D12_RESOURCE_FLAGS)0x400;
 
 #ifndef _D3D12MA_ENUM_DECLARATIONS
 
@@ -7849,7 +7850,7 @@ HRESULT AllocatorPimpl::GetResourceAllocationInfo(
 
 #if D3D12MA_USE_SMALL_RESOURCE_PLACEMENT_ALIGNMENT
     if (inOutResourceDesc.Alignment == 0 &&
-        !IsTightAlignmentEnabled() &&
+        (inOutResourceDesc.Flags & D3D12_RESOURCE_FLAG_USE_TIGHT_ALIGNMENT_COPY) == 0 &&
         (inOutResourceDesc.Dimension == D3D12_RESOURCE_DIMENSION_TEXTURE1D ||
             inOutResourceDesc.Dimension == D3D12_RESOURCE_DIMENSION_TEXTURE2D ||
             inOutResourceDesc.Dimension == D3D12_RESOURCE_DIMENSION_TEXTURE3D) &&