Align Fragment allocation in AVX builder.

Not doing so results in immediate crashes on Linux.

Don't explicitly align Fragment allocation on MSVC,
since the code apparently works anyway.

tiny_bvh.h

@@ -91,6 +91,8 @@ THE SOFTWARE.
 #define ALIGNED( x ) __declspec( align( x ) )
 #define ALIGNED_MALLOC( x ) ( ( x ) == 0 ? 0 : _aligned_malloc( ( x ), 64 ) )
 #define ALIGNED_FREE( x ) _aligned_free( x )
+#define OPERATOR_NEW_ALIGN(x)
+#define OPERATOR_DELETE_ALIGN(x)
 #else
 // gcc / clang
 #include <cstdlib>
@@ -106,6 +108,8 @@ THE SOFTWARE.
 #define ALIGNED_MALLOC( x ) ( ( x ) == 0 ? 0 : aligned_alloc( 64, ( x ) ) )
 #define ALIGNED_FREE( x ) free( x )
 #endif
+#define OPERATOR_NEW_ALIGN(x) (std::align_val_t(x))
+#define OPERATOR_DELETE_ALIGN(x) ,(std::align_val_t(x))
 #endif
 // generic
 #ifdef BVH_USEAVX
@@ -335,7 +339,7 @@ class BVH
 	{
 		ALIGNED_FREE( bvhNode );
 		delete[] triIdx;
-		delete[] fragment;
+		operator delete[](fragment OPERATOR_DELETE_ALIGN(32));
 		bvhNode = 0, triIdx = 0, fragment = 0;
 	}
 	float SAHCost( const unsigned int nodeIdx = 0 ) const
@@ -1012,7 +1016,7 @@ void BVH::BuildAVX( const bvhvec4* vertices, const unsigned int primCount )
 		triIdx = new unsigned int[triCount];
 		bvhNode = (BVHNode*)ALIGNED_MALLOC( triCount * 2 * sizeof( BVHNode ) );
 		memset( &bvhNode[1], 0, 32 ); // avoid crash in refit.
-		fragment = new Fragment[triCount];
+		fragment = new OPERATOR_NEW_ALIGN(32) Fragment[triCount];
 		idxCount = triCount;
 	}
 	else assert( triCount == primCount ); // don't change triangle count between builds.
@@ -1433,4 +1437,4 @@ int BVH::Intersect_AltSoA( Ray& ray ) const
 
 #endif // TINYBVH_IMPLEMENTATION
 
-#endif // TINY_BVH_H_
+#endif // TINY_BVH_H_