[dawn] Use DXC instead of FXC (#49075)

ports/dawn/011-fix-dxc.patch

@@ -0,0 +1,34 @@
+diff --git a/src/dawn/native/CMakeLists.txt b/src/dawn/native/CMakeLists.txt
+index 0c5dc4dbba..9f6a8a0c93 100644
+--- a/src/dawn/native/CMakeLists.txt
++++ b/src/dawn/native/CMakeLists.txt
+@@ -950,7 +950,6 @@ if (DAWN_ENABLE_D3D12)
+     if (DAWN_USE_BUILT_DXC)
+         target_compile_definitions(dawn_native PRIVATE "DAWN_USE_BUILT_DXC")
+         target_compile_definitions(dawn_native_objects PRIVATE "DAWN_USE_BUILT_DXC")
+-        add_dependencies(dawn_native copy_dxil_dll)
+     endif()
+ endif()
+ 
+@@ -1051,7 +1050,7 @@ endif ()
+ # They happen because dxcompiler is declared a shared library and bundle_libraries
+ # doesn't work well with shared libs
+ if (DAWN_USE_BUILT_DXC)
+-    target_link_libraries(dawn_native PRIVATE dxcompiler)
++    target_link_libraries(dawn_native PRIVATE Microsoft::DirectXShaderCompiler)
+ endif()
+ 
+ # Copy d3dcompiler_47.dll from Windows SDK when not using system component loading
+diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
+index e9dde19a4a..5d64975fb6 100644
+--- a/third_party/CMakeLists.txt
++++ b/third_party/CMakeLists.txt
+@@ -361,7 +361,7 @@ function(AddSubdirectoryDXC)
+ endfunction()
+ 
+ if (DAWN_USE_BUILT_DXC)
+-    AddSubdirectoryDXC()
++    find_package(directx-dxc CONFIG REQUIRED GLOBAL)
+ endif()
+ 
+ if (TINT_BUILD_TINTD)

ports/dawn/portfile.cmake

@@ -45,6 +45,7 @@ vcpkg_from_github(
         008-wrong-dxcapi-include.patch
         009-fix-tint-install.patch
         010-fix-glslang.patch
+		011-fix-dxc.patch
 )
 
 # vcpkg_find_acquire_program(PYTHON3)
@@ -136,6 +137,11 @@ vcpkg_check_features(
         tint    TINT_BUILD_CMD_TOOLS
 )
 
+set(DAWN_USE_BUILT_DXC OFF)
+if(DAWN_ENABLE_D3D11 OR DAWN_ENABLE_D3D12)
+	set(DAWN_USE_BUILT_DXC ON)
+endif()
+
 vcpkg_cmake_configure(
     SOURCE_PATH "${SOURCE_PATH}"
     OPTIONS
@@ -162,6 +168,7 @@ vcpkg_cmake_configure(
         -DDAWN_ENABLE_VULKAN=${DAWN_ENABLE_VULKAN}
         -DDAWN_USE_WAYLAND=${DAWN_USE_WAYLAND}
         -DDAWN_USE_X11=${DAWN_USE_X11}
+		-DDAWN_USE_BUILT_DXC=${DAWN_USE_BUILT_DXC}
 )
 
 vcpkg_cmake_install()

ports/dawn/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "dawn",
   "version": "20251202.213730",
-  "port-version": 1,
+  "port-version": 2,
   "description": "Dawn is an open-source and cross-platform implementation of the WebGPU standard.",
   "homepage": "https://dawn.googlesource.com/dawn",
   "license": "BSD-3-Clause",
@@ -56,11 +56,17 @@
   "features": {
     "d3d11": {
       "description": "Direct3D 11 backend support",
-      "supports": "windows"
+      "supports": "windows",
+      "dependencies": [
+        "directx-dxc"
+      ]
     },
     "d3d12": {
       "description": "Direct3D 12 backend support",
-      "supports": "windows"
+      "supports": "windows",
+      "dependencies": [
+        "directx-dxc"
+      ]
     },
     "gl": {
       "description": "Desktop OpenGL backend support",

versions/baseline.json

@@ -2358,7 +2358,7 @@
     },
     "dawn": {
       "baseline": "20251202.213730",
-      "port-version": 1
+      "port-version": 2
     },
     "daxa": {
       "baseline": "3.3.1",

versions/d-/dawn.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "f9d0ccec0c29cc0028a3380a85ed8728dc40bf92",
+      "version": "20251202.213730",
+      "port-version": 2
+    },
     {
       "git-tree": "181678a52e8a7859b9b0f6759bacbb41069a78f9",
       "version": "20251202.213730",