D3D is now used by default on Windows

Author: Zylann

.github/workflows/mono.yml

@@ -247,6 +247,13 @@ jobs:
         run: |
           python ./modules/mono/build_scripts/build_assemblies.py --godot-output-dir=./bin
 
+      # Add DirectX 12 support.
+      # This is not provided by default, despite Godot using D3D by default since 4.6.
+      # See https://docs.godotengine.org/en/stable/contributing/development/compiling/compiling_for_windows.html#compiling-with-support-for-direct3d-12
+      - name: Add D3D12
+        run: |
+          python misc/scripts/install_d3d12_sdk_windows.py
+
       # Compile with explicit flags.
       # `PYTHONIOENCODING` was needed due to certain characters the Godot build system might print (such as '∞'), 
       # otherwise it makes the job fail with an encoding error.