Disabled preference for creating small buffers as committed when tight alignment is used

include/D3D12MemAlloc.h

diff --git a/include/D3D12MemAlloc.h b/include/D3D12MemAlloc.h
index 737e6ae..bb102da 100644
--- a/include/D3D12MemAlloc.h
+++ b/include/D3D12MemAlloc.h
@@ -1051,6 +1051,11 @@
     which may take longer than creating placed resources in existing heaps.

     Passing this flag will disable this committed preference globally for the allocator.

     It can also be disabled for a single allocation by using #ALLOCATION_FLAG_STRATEGY_MIN_TIME.

+

+    If the tight resource alignment feature is used by the library (which happens automatically whenever supported,

+    unless you use flag #ALLOCATOR_FLAG_DONT_USE_TIGHT_ALIGNMENT), then small buffers are not preferred as committed.

+    Long story short, you don't need to specify any of these flags.

+    The library chooses the most optimal method automatically.

     */

     ALLOCATOR_FLAG_DONT_PREFER_SMALL_BUFFERS_COMMITTED = 0x10,

     /** TODO document... */

src/D3D12MemAlloc.cpp

diff --git a/src/D3D12MemAlloc.cpp b/src/D3D12MemAlloc.cpp
index 7eb79f0..d67ac34 100644
--- a/src/D3D12MemAlloc.cpp
+++ b/src/D3D12MemAlloc.cpp
@@ -5999,7 +5999,7 @@
     const bool m_UseMutex;

     const bool m_AlwaysCommitted;

     const bool m_MsaaAlwaysCommitted;

-    const bool m_PreferSmallBuffersCommitted;

+    bool m_PreferSmallBuffersCommitted;

     const bool m_UseTightAlignment;

     bool m_DefaultPoolsNotZeroed = false;

     ID3D12Device* m_Device; // AddRef

@@ -6192,6 +6192,14 @@
         if (SUCCEEDED(hr))

         {

             m_TightAlignmentSupported = tightAlignment.SupportTier >= D3D12_TIGHT_ALIGNMENT_TIER_1;

+            

+            // If tight alignment is supported (checked by the code above) and wasn't disabled by the developer

+            // (with ALLOCATOR_FLAG_DONT_USE_TIGHT_ALIGNMENT), disable the preference for creating small buffers as committed,

+            // as if ALLOCATOR_FLAG_DONT_PREFER_SMALL_BUFFERS_COMMITTED was specified.

+            if (IsTightAlignmentEnabled())

+            {

+                m_PreferSmallBuffersCommitted = false;

+            }

         }

     }

 #endif