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LibGodot: Core - Build Godot Engine as a Library

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* Add a new GodotInstance GDCLASS that provides startup and iteration commands to control a Godot instance.
* Adds a libgodot_create_godot_instance entry point that creates a new Godot instance and returns a GodotInstance object.
* Adds a libgodot_destroy_godot_instance entry point that destroys the Godot instance.

Sample Apps: https://github.com/migeran/libgodot_project

Developed by [Migeran](https://migeran.com)

Sponsors & Acknowledgements:

* Initial development sponsored by [Smirk Software](https://www.smirk.gg/)
* Rebasing to Godot 4.3 and further development sponsored by [Xibbon Inc.](https://xibbon.com)
* The GDExtension registration of the host process & build system changes were based
  on @Faolan-Rad's LibGodot PR: https://github.com/godotengine/godot/pull/72883
* Thanks to Ben Rog-Wilhelm (Zorbathut) for creating a smaller, minimal version for easier review.
* Thanks to Ernest Lee (iFire) for his support

Co-Authored-By: Gabor Koncz <gabor.koncz@migeran.com>
Co-Authored-By: Ben Rog-Wilhelm <zorba-github@pavlovian.net>
This commit is contained in:
Gergely Kis
2025-09-24 06:36:20 +02:00
parent c01c7b800d
commit 6c44c80c62
23 changed files with 752 additions and 16 deletions
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74
core/extension/gdextension_function_loader.cpp Normal file
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/**************************************************************************/
/* gdextension_function_loader.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "gdextension_function_loader.h"
#include "gdextension.h"
Error GDExtensionFunctionLoader::open_library(const String &p_path) {
ERR_FAIL_COND_V_MSG(!p_path.begins_with("libgodot://"), ERR_FILE_NOT_FOUND, "Function based GDExtensions should have a path starting with libgodot://");
ERR_FAIL_COND_V_MSG(!initialization_function, ERR_DOES_NOT_EXIST, "Initialization function is required for function based GDExtensions.");
library_path = p_path;
return OK;
}
Error GDExtensionFunctionLoader::initialize(GDExtensionInterfaceGetProcAddress p_get_proc_address, const Ref<GDExtension> &p_extension, GDExtensionInitialization *r_initialization) {
ERR_FAIL_COND_V_MSG(!initialization_function, ERR_DOES_NOT_EXIST, "Initialization function is required for function based GDExtensions.");
GDExtensionBool ret = initialization_function(p_get_proc_address, p_extension.ptr(), r_initialization);
if (ret) {
return OK;
} else {
ERR_FAIL_V_MSG(FAILED, "GDExtension initialization function for '" + library_path + "' returned an error.");
}
}
void GDExtensionFunctionLoader::close_library() {
initialization_function = nullptr;
library_path.clear();
}
bool GDExtensionFunctionLoader::is_library_open() const {
return !library_path.is_empty();
}
bool GDExtensionFunctionLoader::has_library_changed() const {
return false;
}
bool GDExtensionFunctionLoader::library_exists() const {
return true;
}
void GDExtensionFunctionLoader::set_initialization_function(GDExtensionInitializationFunction p_initialization_function) {
initialization_function = p_initialization_function;
}