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# godot-cpp
This repository contains the *C++ bindings* for the [**Godot Engine**](https://github.com/godotengine/godot)'s GDExtensions API.
- [**Versioning**](#versioning)
- [**Contributing**](#contributing)
- [**Getting Started**](#getting-started)
- [**Included Example**](#included-example)
## Versioning
This repositories follows the same branch versioning as the main [Godot Engine
repository](https://github.com/godotengine/godot):
- `master` tracks the current development branch.
- `3.x` tracks the development of the next 3.x minor release.
- Other versioned branches (e.g. `3.3`, `3.2`) track the latest stable release
in the corresponding branch.
Stable releases are also tagged on this repository:
[**Tags**](https://github.com/godotengine/godot-cpp/tags).
**For any project built against a stable release of Godot, we recommend using
this repository as a Git submodule, checking out the specific tag matching your
Godot version.**
> As the `master` and `3.x` branches are constantly getting updates, if you are
> using `godot-cpp` against a more current version of Godot, see the instructions
> in [**godot-headers**](https://github.com/godotengine/godot-headers) for
> updating the relevant files.
## Contributing
We greatly appreciate help in maintaining and extending this project. If you
wish to help out, ensure you have an account on GitHub and create a "fork" of
this repository. Rémi "Akien" Verschelde wrote an excellent bit of documentation
for the main Godot project on this:
[Pull request workflow](https://docs.godotengine.org/en/stable/community/contributing/pr_workflow.html)
Please install clang-format and copy the files in `misc/hooks` into `.git/hooks`
so formatting is done before your changes are submitted.
## Getting Started
It's a bit similar to what it was for 3.x but also a bit different.
This new approach is much more akin to how core Godot modules are structured.
Compiling this repository generates a static library to be linked with your shared lib,
just like before.
To use the shared lib in your Godot project you'll need a `.gdextension`
file, which replaces what was the `.gdnlib` before.
Follow [the example](test/demo/example.gdextension):
```ini
[configuration]
entry_symbol = "example_library_init"
[libraries]
macos.debug = "bin/libgdexample.macos.debug.framework"
macos.release = "bin/libgdexample.macos.release.framework"
windows.debug.x86_64 = "bin/libgdexample.windows.debug.x86_64.dll"
windows.release.x86_64 = "bin/libgdexample.windows.release.x86_64.dll"
linux.debug.x86_64 = "bin/libgdexample.linux.debug.x86_64.so"
linux.release.x86_64 = "bin/libgdexample.linux.release.x86_64.so"
# Repeat for other architectures to support arm64, rv64, etc.
```
The `entry_symbol` is the name of the function that initializes
your library. It should be similar to following layout:
```cpp
extern "C" {
// Initialization.
GDNativeBool GDN_EXPORT example_library_init(const GDNativeInterface *p_interface, GDNativeExtensionClassLibraryPtr p_library, GDNativeInitialization *r_initialization) {
godot::GDExtensionBinding::InitObject init_obj(p_interface, p_library, r_initialization);
init_obj.register_initializer(initialize_example_module);
init_obj.register_terminator(uninitialize_example_module);
init_obj.set_minimum_library_initialization_level(MODULE_INITIALIZATION_LEVEL_SCENE);
return init_obj.init();
}
}
```
The `initialize_example_module()` should register the classes in ClassDB, very like a Godot module would do.
```cpp
using namespace godot;
void initialize_example_module(ModuleInitializationLevel p_level) {
if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
return;
}
ClassDB::register_class<Example>();
}
```
Any node and resource you register will be available in the corresponding `Create...` dialog. Any class will be available to scripting as well.
## Included Example
Check the project in the `test` folder for an example on how to use and register different things.
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