May 2026

.github/copilot-instructions.md

@@ -110,7 +110,7 @@ HRESULT DirectX::ComputeNormals(
 #### `noexcept` Rules
 
 - All query and utility functions that cannot fail (e.g., `IsValidVB`, `IsValidIB`) are marked `noexcept`.
-- HRESULT-returning functions that do not perform heap allocation or use Standard C++ containers are `noexcept` — errors are communicated via return code, never via exceptions (e.g., `ComputeNormals`, `ReorderIB`, `FinalizeIB`, `FinalizeVB`, `CompactVB`, `OptimizeVertices`, `ComputeCullData`).
+- HRESULT-returning functions that do not use Standard C++ containers are `noexcept` — errors are communicated via return code, never via exceptions (e.g., `ComputeNormals`, `ReorderIB`, `FinalizeIB`, `FinalizeVB`, `CompactVB`, `OptimizeVertices`, `ComputeCullData`). Note that `noexcept` HRESULT functions may still allocate scratch memory internally using `new (std::nothrow)` and return `E_OUTOFMEMORY` on failure — `noexcept` only means they will not throw C++ exceptions.
 - HRESULT-returning functions that use `std::vector`, `std::function`, or other potentially throwing types are *not* marked `noexcept` — they may throw on allocation failure (e.g., `GenerateAdjacencyAndPointReps`, `Validate`, `Clean`, `WeldVertices`, `ComputeMeshlets`, `OptimizeFaces`).
 - Constructors and functions that perform heap allocation or utilize Standard C++ containers that may throw are marked `noexcept(false)`.
 

.nuget/directxmesh_desktop_win10.nuspec

@@ -10,7 +10,7 @@
         <description>This version is for Windows desktop applications using Visual Studio 2022 on Windows 10 / Windows 11 including both DirectX 11 and DirectX 12.
 
 DirectXMesh, a shared source library for performing various geometry content processing operations including generating normals and tangent frames, triangle adjacency computations, vertex cache optimization, and meshlet generation.</description>
-        <releaseNotes>Matches the March 31, 2026 release on GitHub.</releaseNotes>
+        <releaseNotes>Matches the May 7, 2026 release on GitHub.</releaseNotes>
         <projectUrl>http://go.microsoft.com/fwlink/?LinkID=324981</projectUrl>
         <repository type="git" url="https://github.com/microsoft/DirectXMesh.git" />
         <icon>images\icon.jpg</icon>

.nuget/directxmesh_uwp.nuspec

@@ -10,7 +10,7 @@
         <description>This version is for Universal Windows Platform apps on Windows 10 / Windows 11 using Visual Studio 2022.
 
 DirectXMesh, a shared source library for performing various geometry content processing operations including generating normals and tangent frames, triangle adjacency computations, vertex cache optimization, and meshlet generation.</description>
-        <releaseNotes>Matches the March 31, 2026 release on GitHub.</releaseNotes>
+        <releaseNotes>Matches the May 7, 2026 release on GitHub.</releaseNotes>
         <projectUrl>http://go.microsoft.com/fwlink/?LinkID=324981</projectUrl>
         <repository type="git" url="https://github.com/microsoft/DirectXMesh.git" />
         <icon>images\icon.jpg</icon>

CHANGELOG.md

@@ -6,6 +6,12 @@ Releases available for download on [GitHub](https://github.com/microsoft/DirectX
 
 ## Release History
 
+### May 7, 2026
+* *breaking change* Added **nVerts** parameter to `OptimizeFaces(LRU)Ex` functions to improve input bounds checking
+* Extra bounds checking for all functions that take indices via an array
+* CMake project updates
+* Minor comments cleanup
+
 ### March 31, 2026
 * Minor code review
 * VS 2026 support

CMakeLists.txt

@@ -7,7 +7,7 @@ if(POLICY CMP0162)
    cmake_policy(SET CMP0162 NEW)
 endif()
 
-set(DIRECTXMESH_VERSION 1.7.1)
+set(DIRECTXMESH_VERSION 1.7.2)
 
 project(DirectXMesh
   VERSION ${DIRECTXMESH_VERSION}

DirectXMesh/DirectXMesh.h

@@ -40,7 +40,7 @@
 #include <DirectXCollision.h>
 #include <DirectXPackedVector.h>
 
-#define DIRECTX_MESH_VERSION 171
+#define DIRECTX_MESH_VERSION 172
 
 #if defined(_WIN32) && defined(DIRECTX_MESH_EXPORT)
 #ifdef __GNUC__

README.md

@@ -6,7 +6,7 @@ https://go.microsoft.com/fwlink/?LinkID=324981
 
 Copyright (c) Microsoft Corporation.
 
-## March 31, 2026
+## May 7, 2026
 
 This package contains DirectXMesh, a shared source library for performing various geometry content processing operations including generating normals and tangent frames, triangle adjacency computations, vertex cache optimization, and meshlet generation.
 
@@ -56,7 +56,7 @@ For a full change history, see [CHANGELOG.md](https://github.com/microsoft/Direc
 
 * The CMake projects require 3.21 or later.
 
-* Starting with the April 2026 release, the OptimizeFaces(LRU)(Ex) functions now take an `nVerts` parameter in order to validate the input indices. This is a *breaking change*.
+* Starting with the May 2026 release, the functions `OptimizeFaces`, `OptimizeFacesLRU`, `OptimizeFacesEx`, and `OptimizeFacesLRUEx` now take an `nVerts` parameter in order to validate the input indices. This is a *breaking change*.
 
 ```cpp
 hr = OptimizeFaces(indices, nFaces, adjacency, faceRemap, vertexCache, restart);

build/CompilerAndLinker.cmake

@@ -75,7 +75,7 @@ endif()
 
 #--- General MSVC-like SDL options
 if(MSVC)
-    list(APPEND COMPILER_SWITCHES "$<$<NOT:$<CONFIG:DEBUG>>:/guard:cf>")
+    list(APPEND COMPILER_SWITCHES /Gd /GS /Zc:forScope /Zc:inline /Zc:wchar_t $<$<NOT:$<CONFIG:DEBUG>>:/guard:cf>)
     list(APPEND LINKER_SWITCHES /DYNAMICBASE /NXCOMPAT /INCREMENTAL:NO)
 
     if(WINDOWS_STORE)
@@ -141,7 +141,7 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|IntelLLVM")
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
     list(APPEND COMPILER_SWITCHES /Zc:__cplusplus /Zc:inline /fp:fast /Qdiag-disable:161)
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
-    list(APPEND COMPILER_SWITCHES /sdl /Zc:forScope /Zc:inline /Zc:wchar_t /fp:fast)
+    list(APPEND COMPILER_SWITCHES /sdl /fp:fast)
 
     if(WINDOWS_STORE)
       list(APPEND COMPILER_SWITCHES /await)