Godot 项目初始化：C++ GDExtension 骨架

src/example.cpp

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+#include "example.h"
+
+#include <godot_cpp/core/class_db.hpp>
+#include <godot_cpp/core/defs.hpp>
+#include <godot_cpp/godot.hpp>
+
+using namespace godot;
+
+void MyMath::_bind_methods() {
+    // 把 C++ 方法注册给 GDScript 调用
+    ClassDB::bind_method(D_METHOD("add", "a", "b"), &MyMath::add);
+}
+
+MyMath::MyMath() {
+}
+
+MyMath::~MyMath() {
+}
+
+int MyMath::add(int a, int b) {
+    return a + b;
+}

src/example.h

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+#ifndef MARRY_EXAMPLE_H
+#define MARRY_EXAMPLE_H
+
+#include <godot_cpp/classes/ref_counted.hpp>
+
+namespace godot {
+
+// 示例 C++ 类：在 GDScript 里可以直接用 MyMath.new() 创建
+// 之后把你的 C++ 逻辑类都加在这里
+class MyMath : public RefCounted {
+    GDCLASS(MyMath, RefCounted)
+
+protected:
+    static void _bind_methods();
+
+public:
+    MyMath();
+    ~MyMath();
+
+    // 示例方法：加法（GDScript 调用: m.add(3, 4) -> 7）
+    int add(int a, int b);
+};
+
+}
+
+#endif // MARRY_EXAMPLE_H

src/register_types.cpp

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+#include "register_types.h"
+
+#include "example.h"
+
+#include <godot_cpp/core/class_db.hpp>
+#include <godot_cpp/core/defs.hpp>
+#include <godot_cpp/godot.hpp>
+
+using namespace godot;
+
+void initialize_marry_module(ModuleInitializationLevel p_level) {
+    if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+        return;
+    }
+    // 在这里注册所有 C++ 类
+    GDREGISTER_CLASS(MyMath);
+}
+
+void uninitialize_marry_module(ModuleInitializationLevel p_level) {
+    if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+        return;
+    }
+    // godot-cpp 在库卸载时自动清理类，无需手动注销
+}
+
+// Godot 加载扩展的入口（dll 导出符号）
+extern "C" {
+// Initialization.
+GDExtensionBool GDE_EXPORT marry_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_marry_module);
+    init_obj.register_terminator(uninitialize_marry_module);
+    init_obj.set_minimum_library_initialization_level(MODULE_INITIALIZATION_LEVEL_SCENE);
+
+    return init_obj.init();
+}
+}

src/register_types.h

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+#ifndef MARRY_REGISTER_TYPES_H
+#define MARRY_REGISTER_TYPES_H
+
+#include <godot_cpp/core/class_db.hpp>
+
+using namespace godot;
+
+void initialize_marry_module(ModuleInitializationLevel p_level);
+void uninitialize_marry_module(ModuleInitializationLevel p_level);
+
+#endif // MARRY_REGISTER_TYPES_H