摄像机系统，和子对象绑定

include/render.hpp

@@ -13,6 +13,10 @@
 
 #include <actor.hpp>
 
+namespace boundard {
+class Camera;
+}
+
 namespace boundard::render {
 
 struct InputEvent {
@@ -51,6 +55,7 @@ class Renderer {
 
     void init(int width, int height, const char* title);
     void draw(const Actor* const* actors, size_t actor_count);
+    void draw(const Actor* const* actors, size_t actor_count, const Camera* camera);
     bool should_close() const;
     void poll_events() const;
 
@@ -119,6 +124,7 @@ class RenderLoop {
     void stop();
 
     void set_actors(std::vector<Actor*> actors);
+    void set_camera(Camera* camera);
     void poll_events() const;
     bool should_close() const;
 
@@ -134,6 +140,7 @@ class RenderLoop {
     std::atomic<bool> running_{false};
     mutable std::mutex actors_mutex_;
     std::vector<Actor*> actors_;
+    Camera* camera_ = nullptr;
 };
 
 }  // namespace boundard::render