Align buffers to 256 B at least

Because this is the alignment required for constant buffers.

src/D3D12MemAlloc.cpp

diff --git a/src/D3D12MemAlloc.cpp b/src/D3D12MemAlloc.cpp
index d67ac34..976e872 100644
--- a/src/D3D12MemAlloc.cpp
+++ b/src/D3D12MemAlloc.cpp
@@ -7710,7 +7710,15 @@
     }

 #endif // #if D3D12MA_USE_SMALL_RESOURCE_PLACEMENT_ALIGNMENT

 

-    return GetResourceAllocationInfoNative(inOutResourceDesc);

+    D3D12_RESOURCE_ALLOCATION_INFO resAllocInfo = GetResourceAllocationInfoNative(inOutResourceDesc);

+

+    // Align up to 256 B because this is the alignment required for constant buffers.

+    if (inOutResourceDesc.Dimension == D3D12_RESOURCE_DIMENSION_BUFFER)

+    {

+        resAllocInfo.Alignment = D3D12MA_MAX(resAllocInfo.Alignment, (UINT64)D3D12_CONSTANT_BUFFER_DATA_PLACEMENT_ALIGNMENT);

+    }

+

+    return resAllocInfo;

 }

 

 bool AllocatorPimpl::NewAllocationWithinBudget(D3D12_HEAP_TYPE heapType, UINT64 size)