added the basic requiements for physics with box2d

TSE_Core/src/elements/PhysicsEngine.cpp

@@ -0,0 +1,57 @@
+#include "PhysicsEngine.hpp"
+#include "utils/Time.hpp"
+
+void TSE::PhysicsEngine::InitPhysics(Vector2 gravity)
+{
+    b2WorldDef def = b2DefaultWorldDef();
+    def.enableSleep = true;
+    b2Vec2 grav;
+    grav.x = gravity.x;
+    grav.y = gravity.y;
+    def.gravity = grav;
+    worldId = b2CreateWorld(&def);
+}
+
+void TSE::PhysicsEngine::UpdatePhysics()
+{
+    if(elapsedTime >= timestep)
+    {
+        elapsedTime = 0;
+        b2World_Step(worldId, timestep, iterations);
+        //update physics objects
+    }
+    elapsedTime += Time::deltaTime();
+
+    for(auto obj : registeredObjects)
+    {
+        obj->UpdatePosition();
+    }
+}
+
+void TSE::PhysicsEngine::DeletePhysics()
+{
+    b2DestroyWorld(worldId);
+}
+
+void TSE::PhysicsEngine::RegisterPhysicsObject(PhysicsObject *obj)
+{
+    registeredObjects.push_back(obj);
+}
+
+void TSE::PhysicsEngine::UnRegisterPhysicsObject(PhysicsObject *obj)
+{
+    auto it = registeredObjects.begin();
+    for (; it != registeredObjects.end(); it++)
+    {
+        if(*it == obj)
+        {
+            registeredObjects.erase(it);
+            return;
+        }
+    }
+}
+
+b2WorldId &TSE::PhysicsEngine::GetWorldId()
+{
+    return worldId;
+}

TSE_Core/src/elements/PhysicsEngine.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "BehaviourScripts/PhysicsObject.hpp"
+#include "box2d/box2d.h"
+#include <vector>
+#include "Vector2.hpp"
+
+namespace TSE
+{
+    class PhysicsEngine
+    {
+    private:
+        inline static std::vector<PhysicsObject*> registeredObjects = std::vector<PhysicsObject*>();
+        inline static b2WorldId worldId = b2WorldId();
+        inline static constexpr float timestep = 1.0f / 60.0f;
+        inline static const int iterations = 4;
+        inline static float elapsedTime = 0;
+        
+    public:
+        static void InitPhysics(Vector2 gravity);
+        static void UpdatePhysics();
+        static void DeletePhysics();
+        static void RegisterPhysicsObject(PhysicsObject* obj);
+        static void UnRegisterPhysicsObject(PhysicsObject* obj);
+        
+        static b2WorldId& GetWorldId();
+    };
+} // namespace TSE