1 files changed, 55 insertions, 0 deletions

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+#ifndef SYSTEM_H_B61A8CEA
+#define SYSTEM_H_B61A8CEA
+
+#include "entity_manager.h"
+
+class Game;
+class Texture;
+
+class System {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  System(Game& game) : game_(game)
+  {
+  }
+
+  virtual ~System() = default;
+
+  /**
+   * Updates the state of a system.
+   *
+   * @param dt - The amount of time in seconds that have passed since the last
+   *             update.
+   */
+  virtual void tick(double)
+  {
+  }
+
+  /**
+   * Renders to a texture.
+   *
+   * @param texture - The surface to render to.
+   */
+  virtual void render(Texture&)
+  {
+  }
+
+  /**
+   * Processes keyboard input.
+   *
+   * @param key - The relevant key.
+   *
+   * @param action - The action performed (press, released, etc).
+   */
+  virtual void input(int, int)
+  {
+  }
+
+protected:
+
+  Game& game_;
+};
+
+#endif /* end of include guard: SYSTEM_H_B61A8CEA */