System.hpp

#pragma once
 
#include <cinttypes>
 
namespace Grindstone {
    class Scene;
 
    namespace ECS {
        using SystemType = std::uint8_t;
        const SystemType MAX_SYSTEMS = UINT8_MAX;
        const SystemType INVALID_SYSTEM = UINT8_MAX;
 
        class ISystem {
        public:
            virtual void update() = 0;
 
            Scene *scene_;
            SystemType system_type_;
        };
    }
}
 
#define SYSTEM_BODY(T)  static Grindstone::ECS::SystemType static_system_type_; \
                        static const char *system_name_; \
                        T(Grindstone::Scene *s) { scene_ = s; system_type_ = Grindstone::ECS::INVALID_SYSTEM; } \
                        static Grindstone::ECS::ISystem* createSystem(Grindstone::Scene *s) { return new T(s); }
#define SYSTEM_DEFINE(T, Name) Grindstone::ECS::SystemType T::static_system_type_ = 0; const char * T::system_name_ = Name