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/**
* @file engine.hpp
* @brief The main game engine, and functions to assist it.
*/
#ifndef ENGINE_HPP_
#define ENGINE_HPP_
#include <atomic>
#include <chrono>
#include <thread>
#include <entityx/entityx.h>
#include <components.hpp>
#include <events.hpp>
//game::engine::Systems->add<entityx::deps::Dependency<Visible, Sprite>>();
/**
* @class Engine
* The main game engine class. Only one instance of this should be created, it
* handles everything game-related.
*/
class Engine : public entityx::Receiver<Engine> {
public:
/**
* A flag to indicate if a thread should continue to run.
*/
bool shouldRun;
/**
* Handles game systems.
*/
entityx::SystemManager systems;
explicit Engine(void);
/**
* Initializes the game engine, and all systems used within it.
*/
void init(void);
/**
* Updates all logic systems.
* @param dt the delta time
*/
void update(entityx::TimeDelta dt);
/**
* A shortcut to get a system, for calling system-specific functions.
* Takes the type of the desired system.
*/
template<typename T>
inline T* getSystem(void) {
return dynamic_cast<T*>(systems.system<T>().get());
}
/**
* A handler for the game ending event.
* @param gee game end event data
*/
inline void receive(const GameEndEvent &gee) {
shouldRun = !(gee.really);
}
};
class LockableEntityManager : public entityx::EntityManager {
private:
std::atomic_bool locked;
public:
LockableEntityManager(entityx::EventManager& ev)
: EntityManager(ev) {
locked.store(false);
}
void lock(void) {
while (locked.load())
std::this_thread::sleep_for(std::chrono::milliseconds(10));
locked.store(true);
}
void unlock(void) {
locked.store(false);
}
bool try_lock(void) {
if (locked.load())
return false;
locked.store(true);
return true;
}
};
namespace game {
/**
* Handles all game events.
*/
extern entityx::EventManager events;
/**
* Handles entity data.
*/
extern LockableEntityManager entities;
/**
* An instance of the main game engine.
*/
extern Engine engine;
/**
* Ends the game.
*/
inline void endGame(void) {
events.emit<GameEndEvent>();
}
}
#endif // ENGINE_HPP_
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