Add Signal to ECS

- Add Signal class to ECS used to send signals/events into systems

CopiumEngine/src/copium/ecs/ECSManager.cpp

@@ -22,6 +22,13 @@ namespace Copium
     systemPool->Update();
   }
 
+  void ECSManager::UpdateSystems(const Signal& signal)
+  {
+    // TODO: Maybe we want a different pool for Signal based Systems for performance reasons?
+    // Maybe even a pool for each type of Signal?
+    systemPool->Update(signal);
+  }
+
   size_t ECSManager::GetEntityCount() const
   {
     return entities.size();

CopiumEngine/src/copium/ecs/ECSManager.h

@@ -3,6 +3,7 @@
 
 #include "copium/ecs/ComponentPool.h"
 #include "copium/ecs/Config.h"
+#include "copium/ecs/Signal.h"
 #include "copium/ecs/SystemPool.h"
 #include "copium/util/Common.h"
 
@@ -33,6 +34,7 @@ namespace Copium
     }
 
     void UpdateSystems();
+    void UpdateSystems(const Signal& signal);
 
     EntityId CreateEntity();
     void DestroyEntity(EntityId entity);

CopiumEngine/src/copium/ecs/Signal.cpp

@@ -0,0 +1,10 @@
+#include "copium/ecs/Signal.h"
+
+namespace Copium
+{
+  int Signal::GetAllocatedId()
+  {
+    allocatedIds++;
+    return allocatedIds;
+  }
+}

CopiumEngine/src/copium/ecs/Signal.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#define CP_SIGNAL_DECLERATION(SignalClass) \
+  static int GetIdStatic(); \
+  int GetId() const override
+
+#define CP_SIGNAL_DEFINITION(SignalClass) \
+  int SignalClass::GetIdStatic() \
+  { \
+    static int id = GetAllocatedId(); \
+    return id; \
+  } \
+ \
+  int SignalClass::GetId() const \
+  { \
+    return GetIdStatic(); \
+  }
+
+namespace Copium
+{
+  class Signal
+  {
+  private:
+    static inline int allocatedIds = 0;
+
+  public:
+    Signal() = default;
+    virtual ~Signal() = default;
+
+    virtual int GetId() const = 0;
+
+  protected:
+    static int GetAllocatedId();
+  };
+
+}

CopiumEngine/src/copium/ecs/System.h

@@ -15,6 +15,12 @@ namespace Copium
       manager->Each<Components...>([&](EntityId entityId, Components&... components) { RunEntity(Entity{manager, entityId}, components...); });
     }
 
-    virtual void RunEntity(Entity entity, Components&... components) = 0;
+    void Run(const Signal& signal) override
+    {
+      manager->Each<Components...>([&](EntityId entityId, Components&... components) { RunEntity(signal, Entity{manager, entityId}, components...); });
+    }
+
+    virtual void RunEntity(Entity entity, Components&... components) {};
+    virtual void RunEntity(const Signal& signal, Entity entity, Components&... components) {};
   };
 }

CopiumEngine/src/copium/ecs/SystemBase.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include "copium/ecs/Signal.h"
+
 namespace Copium
 {
   class ECSManager;
@@ -12,5 +14,6 @@ namespace Copium
 
   public:
     virtual void Run() = 0;
+    virtual void Run(const Signal& signal) = 0;
   };
 }

CopiumEngine/src/copium/ecs/SystemPool.cpp

@@ -32,6 +32,14 @@ namespace Copium
     }
   }
 
+  void SystemPool::Update(const Signal& signal)
+  {
+    for (auto& system : systemOrder)
+    {
+      system->Run(signal);
+    }
+  }
+
   void SystemPool::MoveSystemAfter(const std::type_index& systemId, const std::type_index& afterSystemId)
   {
     auto it1 = systems.find(systemId);

CopiumEngine/src/copium/ecs/SystemPool.h

@@ -2,6 +2,7 @@
 
 #include "copium/ecs/SystemBase.h"
 #include "copium/ecs/SystemOrderer.h"
+#include "copium/ecs/Signal.h"
 #include "copium/util/Common.h"
 
 #include <vector>
@@ -25,6 +26,7 @@ namespace Copium
     ~SystemPool();
     SystemOrderer AddSystem(const std::type_index& systemId, SystemBase* system);
     void Update();
+    void Update(const Signal& signal);
 
     void MoveSystemAfter(const std::type_index& systemId, const std::type_index& afterSystemId);
     void MoveSystemBefore(const std::type_index& systemId, const std::type_index& beforeSystemId);