3f645f980c
These callbacks are used for marshaling by callables and generic Godot collections. C# generics don't support specialization the way C++ templates do. I knew NativeAOT could optimize away many type checks when the types are known at compile time, but I didn't trust the JIT would do as good a job, so I initially went with cached function pointers. Well, it turns out the JIT is also very good at optimizing in this scenario, so I'm changing the methods to do the conversion directly, rather than returning a function pointer for the conversion. The methods were moved to `VariantUtils`, and were renamed from `GetFromVariantCallback/GetToVariantCallback` to `ConvertTo/CreateFrom`. The new implementation looks like it goes through many `if` checks at runtime to find the right branch for the type, but in practice it works pretty much like template specialization. The JIT only generates code for the relevant branch. Together with inlining, the result is very close or the same as doing the conversion manually: ```cs godot_variant variant; int foo = variant.Int; int bar = VariantUtils.ConvertTo<int>(variant); ``` If the type is a generic Godot collection, the conversion still goes through a function pointer call. The new code happens to be much shorter as well, with the file going from 1057 lines to 407. Side note: `Variant.cs` was mistakenly created in the wrong folder, so I moved it to the `Core` folder. |
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|---|---|---|
| .. | ||
| build_scripts | ||
| doc_classes | ||
| editor | ||
| glue | ||
| icons | ||
| mono_gd | ||
| thirdparty | ||
| utils | ||
| __init__.py | ||
| .editorconfig | ||
| .gitignore | ||
| class_db_api_json.cpp | ||
| class_db_api_json.h | ||
| config.py | ||
| csharp_script.cpp | ||
| csharp_script.h | ||
| Directory.Build.props | ||
| Directory.Build.targets | ||
| godotsharp_defs.h | ||
| godotsharp_dirs.cpp | ||
| godotsharp_dirs.h | ||
| interop_types.h | ||
| managed_callable.cpp | ||
| managed_callable.h | ||
| mono_gc_handle.cpp | ||
| mono_gc_handle.h | ||
| README.md | ||
| register_types.cpp | ||
| register_types.h | ||
| SCsub | ||
| signal_awaiter_utils.cpp | ||
| signal_awaiter_utils.h | ||
How to build and run
- Build Godot with the module enabled:
module_mono_enabled=yes. - After building Godot, use it to generate the C# glue code:
<godot_binary> --generate-mono-glue ./modules/mono/glue - Build the C# solutions:
./modules/mono/build_scripts/build_assemblies.py --godot-output-dir ./bin
The paths specified in these examples assume the command is being run from the Godot source root.
How to deal with NuGet packages
We distribute the API assemblies, our source generators, and our custom MSBuild project SDK as NuGet packages. This is all transparent to the user, but it can make things complicated during development.
In order to use Godot with a development of those packages, we must create a local NuGet source where MSBuild can find them. This can be done with the .NET CLI:
dotnet nuget add source ~/MyLocalNugetSource --name MyLocalNugetSource
The Godot NuGet packages must be added to that local source. Additionally, we must make sure there are no other versions of the package in the NuGet cache, as MSBuild may pick one of those instead.
In order to simplify this process, the build_assemblies.py script provides
the following --push-nupkgs-local option:
./modules/mono/build_scripts/build_assemblies.py --godot-output-dir ./bin \
--push-nupkgs-local ~/MyLocalNugetSource
This option ensures the packages will be added to the specified local NuGet source and that conflicting versions of the package are removed from the NuGet cache. It's recommended to always use this option when building the C# solutions during development to avoid mistakes.
Double Precision Support (REAL_T_IS_DOUBLE)
Follow the above instructions but build Godot with the float=64 argument to scons
When building the NuGet packages, specify --float=64 - for example:
./modules/mono/build_scripts/build_assemblies.py --godot-output-dir ./bin \
--push-nupkgs-local ~/MyLocalNugetSource --float=64