Add Windows ARM64 support

CLAUDE.md

@@ -82,7 +82,7 @@ black . --line-length 100
 
 ## Development Tips
 
-- The project uses CMake with presets for different platforms (windows-msvc, linux-gcc, macos-arm64-clang)
+- The project uses CMake with presets for different platforms (windows-msvc, windows-arm64-msvc, linux-gcc, macos-arm64-clang)
 - PyTorch integration is automatic when PyTorch is installed
 - Hot-reload is supported for shader development
 - Use `python tools/ci.py` for most build/test tasks - it handles platform-specific configuration

CMakePresets.json

@@ -91,6 +91,40 @@
                 "windows-clang-base"
             ]
         },
+        {
+            "name": "windows-arm64-base",
+            "description": "Base Windows ARM64 configuration.",
+            "hidden": true,
+            "inherits": "windows-base",
+            "cacheVariables": {
+                "VCPKG_TARGET_TRIPLET": "arm64-windows-static-md-fix"
+            }
+        },
+        {
+            "name": "windows-arm64-msvc-base",
+            "description": "Base Visual Studio 2022 ARM64 configuration.",
+            "hidden": true,
+            "inherits": "windows-arm64-base",
+            "generator": "Ninja Multi-Config",
+            "architecture": {
+                "value": "ARM64",
+                "strategy": "external"
+            },
+            "cacheVariables": {
+                "CMAKE_C_COMPILER": "cl",
+                "CMAKE_CXX_COMPILER": "cl"
+            }
+        },
+        {
+            "name": "windows-arm64-msvc",
+            "inherits": [
+                "windows-arm64-msvc-base"
+            ],
+            "cacheVariables": {
+                "CMAKE_CXX_FLAGS": "/EHsc",
+                "SGL_WARNINGS_AS_ERRORS": "OFF"
+            }
+        },
         {
             "name": "linux-base",
             "description": "Base Linux configuration.",
@@ -190,6 +224,18 @@
             "configurePreset": "windows-clang",
             "configuration": "Debug"
         },
+        {
+            "name": "windows-arm64-msvc-release",
+            "displayName": "Release",
+            "configurePreset": "windows-arm64-msvc",
+            "configuration": "Release"
+        },
+        {
+            "name": "windows-arm64-msvc-debug",
+            "displayName": "Debug",
+            "configurePreset": "windows-arm64-msvc",
+            "configuration": "Debug"
+        },
         {
             "name": "linux-clang-release",
             "displayName": "Release",

external/CMakeLists.txt

@@ -162,7 +162,11 @@ function(sgl_add_library_slang)
         sgl_copy_binary(${SLANG_DIR}/bin/${slang_lib_base}.dll .)
         sgl_copy_binary(${SLANG_DIR}/bin/slang-glslang.dll .)
         sgl_copy_binary(${SLANG_DIR}/bin/slang-glsl-module.dll .)
-        sgl_copy_binary(${SLANG_DIR}/bin/slang-llvm.dll .)
+        # slang-llvm.dll is available in x64 prebuilt packages but not in ARM64 packages.
+        # Use conditional copy to support both architectures.
+        if(EXISTS ${SLANG_DIR}/bin/slang-llvm.dll)
+            sgl_copy_binary(${SLANG_DIR}/bin/slang-llvm.dll .)
+        endif()
         # Note: The downloaded debug-info archive has single top-level 'bin'
         # folder that is stripped out by FetchContent.
         set(slang_resolved_debug_info "${slang_lib_base}.pdb")

external/vcpkg-triplets/arm64-windows-static-md-fix.cmake

@@ -0,0 +1,7 @@
+set(VCPKG_TARGET_ARCHITECTURE arm64)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_LIBRARY_LINKAGE static)
+# _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR avoids the use of constexpr mutex constructor
+# in vcpkg packages, which can lead to binary incompatibility issues.
+set(VCPKG_C_FLAGS "-D_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR")
+set(VCPKG_CXX_FLAGS "-D_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR")

setup.py

@@ -4,7 +4,7 @@
 
 from __future__ import print_function
 
-import sys, re, os, subprocess, shutil
+import sys, re, os, subprocess, shutil, platform
 from pathlib import Path
 
 try:
@@ -31,11 +31,24 @@
 else:
     raise Exception(f"Unsupported platform: {sys.platform}")
 
-CMAKE_PRESET = {
-    "windows": "windows-msvc",
-    "linux": "linux-gcc",
-    "macos": "macos-arm64-clang",
-}[PLATFORM]
+# Detect architecture for platform-specific CMake presets
+if PLATFORM == "windows":
+    python_arch = platform.machine().lower()
+    is_arm64 = python_arch in ("arm64", "aarch64")
+    if is_arm64:
+        CMAKE_PRESET = "windows-arm64-msvc"
+        MSVC_PLAT_SPEC = "x86_arm64"
+    else:
+        CMAKE_PRESET = "windows-msvc"
+        MSVC_PLAT_SPEC = "x64"
+elif PLATFORM == "linux":
+    CMAKE_PRESET = "linux-gcc"
+    MSVC_PLAT_SPEC = None
+elif PLATFORM == "macos":
+    CMAKE_PRESET = "macos-arm64-clang"
+    MSVC_PLAT_SPEC = None
+else:
+    raise RuntimeError(f"Unsupported platform: {PLATFORM}")
 
 CMAKE_CONFIG = "RelWithDebInfo"
 
@@ -67,7 +80,7 @@ def build_extension(self, ext: CMakeExtension) -> None:
             sys.path.append(str(Path(__file__).parent / "tools"))
             import msvc  # type: ignore
 
-            env = msvc.msvc14_get_vc_env("x64")
+            env = msvc.msvc14_get_vc_env(MSVC_PLAT_SPEC)
 
         build_dir = str(SOURCE_DIR / "build/pip")
 

src/sgl/CMakeLists.txt

@@ -1,6 +1,8 @@
 
 add_library(sgl SHARED)
 
+option(SGL_WARNINGS_AS_ERRORS "Treat compiler warnings as errors" ON)
+
 target_sources(sgl PRIVATE
     sgl.natvis
 
@@ -201,7 +203,7 @@ target_compile_options(sgl
             /MP                             # enable multi-processor compilation
             /Zi                             # generate debug symbols
             # Configure warnings
-            /WX                             # warnings as errors
+            $<$<BOOL:${SGL_WARNINGS_AS_ERRORS}>:/WX>    # warnings as errors
             /W4                             # increase warning level
             /wd4251                         # 'type' : class 'type1' needs to have dll-interface to be used by clients of class 'type2'
             /wd4201                         # nonstandard extension used: nameless struct/union
@@ -222,7 +224,7 @@ target_compile_options(sgl
             -fvisibility=hidden             # hide symbols by default
             -Wall                           # set warning level
             -Wextra                         # enable extra warnings
-            -Werror                         # treat warnings as errors
+            $<$<BOOL:${SGL_WARNINGS_AS_ERRORS}>:-Werror>    # treat warnings as errors
             -Wno-unused-function
             -Wno-unused-variable
             -Wno-unused-but-set-variable

tools/ci.py

@@ -38,7 +38,7 @@ def get_platform():
     machine = platform.machine()
     if machine == "x86_64" or machine == "AMD64":
         return "x86_64"
-    elif machine == "aarch64" or machine == "arm64":
+    elif machine == "aarch64" or machine == "arm64" or machine == "ARM64":
         return "aarch64"
     else:
         raise NameError(f"Unsupported platform: {machine}")
@@ -316,6 +316,8 @@ def main():
             preset = preset.replace("macos", "macos-x64")
         elif args["platform"] == "aarch64":
             preset = preset.replace("macos", "macos-arm64")
+    elif args["os"] == "windows" and args["platform"] == "aarch64":
+        preset = "windows-arm64-" + args["compiler"]
     args["preset"] = preset
 
     # Determine binary directory.