乒乓球游戏：C++ GDExtension 实现

src/pingpong_game.h

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+#ifndef PINGPONG_GAME_H
+#define PINGPONG_GAME_H
+
+#include <godot_cpp/classes/node2d.hpp>
+#include <godot_cpp/classes/label.hpp>
+
+namespace godot {
+
+class PingPongGame : public Node2D {
+    GDCLASS(PingPongGame, Node2D)
+
+private:
+    int left_score = 0;
+    int right_score = 0;
+    int max_score = 5;
+
+    Label *left_score_label = nullptr;
+    Label *right_score_label = nullptr;
+
+    void update_score_display();
+
+protected:
+    static void _bind_methods();
+
+public:
+    PingPongGame();
+    ~PingPongGame();
+
+    void _ready() override;
+
+    // 得分处理
+    void _on_ball_scored(int which);
+
+    // 重置整局游戏
+    void reset_game();
+
+    // 属性 getter/setter
+    void set_left_score(int p_score);
+    int get_left_score() const;
+
+    void set_right_score(int p_score);
+    int get_right_score() const;
+
+    void set_max_score(int p_score);
+    int get_max_score() const;
+
+    // 信号: game_over(int winner) — 0=左边赢, 1=右边赢
+};
+
+}
+
+#endif // PINGPONG_GAME_H