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# redot-cpp
> [!WARNING]
>
> This repository's `master` branch is only usable with
> [GDExtension](https://godotengine.org/article/introducing-gd-extensions)
> from Redot's `master` branch.
This repository contains the *C++ bindings* for the [**Redot Engine**](https://github.com/Redot-Engine/redot-engine)'s GDExtensions API.
- [**Versioning**](#versioning)
- [**Compatibility**](#compatibility)
- [**Contributing**](#contributing)
- [**Getting started**](#getting-started)
- [**Examples and templates**](#examples-and-templates)
## Versioning
This repositories follows the same branch versioning as the main [Redot Engine
repository](https://github.com/Redot-Engine/redot-engine):
- `master` tracks the current GDExtension development branch for the next Redot
4.x minor release.
- Other versioned branches (e.g. `4.3`) track the latest stable release
in the corresponding branch.
Stable releases are also tagged on this repository:
[**Tags**](https://github.com/Redot-Engine/redot-cpp/tags).
**For any project built against a stable release of Redot, we recommend using
this repository as a Git submodule, checking out the specific tag matching your
Redot version.**
> As the `master` branch of Redot is constantly getting updated, if you are
> using `redot-cpp` against a more current version of Redot, see the instructions
> in the `gdextension` folder to update the relevant files.
## Compatibility
> [!WARNING]
>
> The GDExtension API is brand new since Godot 4.0, and is still
considered in **beta** stage, despite Redot 4.3 itself being released.
>
> This applies to both the GDExtension interface header, the API JSON, and this
first-party `redot-cpp` extension.
>
> Some compatibility breakage is to be expected as GDExtension and `redot-cpp`
> get more used, documented, and critical issues get resolved. See the
> [Redot issue tracker](https://github.com/Redot-Engine/redot-engine/issues?q=is%3Aissue+is%3Aopen+label%3Atopic%3Agdextension),
> the [Godot issue tracker](ttps://github.com/godotengine/godot/issues?q=is%3Aissue+is%3Aopen+label%3Atopic%3Agdextension),
> the [godot-cpp issue tracker](https://github.com/godotengine/godot-cpp/issues),
> and the [redot-cpp issue tracker](https://github.com/Redot-Engine/redot-cpp/issues)
> for a list of known issues, and be sure to provide feedback on issues and PRs
> which affect your use of this extension.
## 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. See [Pull request workflow](https://docs.redotengine.org/en/stable/community/contributing/pr_workflow.html)
for instructions.
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
You need the same C++ pre-requisites installed that are required for the `redot-engine` repository. Follow the [official build instructions for your target platform](https://docs.redotengine.org/en/latest/contributing/development/compiling/index.html#building-for-target-platforms).
Getting started with GDExtensions is a bit similar to what it was for Godot 3.x but also a bit different.
This new approach is much more akin to how core Redot 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 Redot project you'll need a `.gdextension`
file, which replaces what was the `.gdnlib` before.
See [example.gdextension](test/project/example.gdextension) used in the test project:
```ini
[configuration]
entry_symbol = "example_library_init"
compatibility_minimum = "4.1"
[libraries]
macos.debug = "res://bin/libgdexample.macos.debug.framework"
macos.release = "res://bin/libgdexample.macos.release.framework"
windows.debug.x86_64 = "res://bin/libgdexample.windows.debug.x86_64.dll"
windows.release.x86_64 = "res://bin/libgdexample.windows.release.x86_64.dll"
linux.debug.x86_64 = "res://bin/libgdexample.linux.debug.x86_64.so"
linux.release.x86_64 = "res://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.
GDExtensionBool GDE_EXPORT example_library_init(GDExtensionInterfaceGetProcAddress p_get_proc_address, GDExtensionClassLibraryPtr p_library, GDExtensionInitialization *r_initialization) {
godot::GDExtensionBinding::InitObject init_obj(p_get_proc_address, 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 Redot module would do.
```cpp
using namespace godot;
void initialize_example_module(ModuleInitializationLevel p_level) {
if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
return;
}
GDREGISTER_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.
## Examples and templates
See the [redot-cpp-template](https://github.com/Redot-Engine/redot-cpp-template) project for a
generic reusable template.
Or checkout the code for the [Summator example](https://github.com/paddy-exe/GDExtensionSummator)
as shown in the [official documentation](https://docs.redotengine.org/en/latest/tutorials/scripting/gdextension/gdextension_cpp_example.html).
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