physicsystem.hpp

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#pragma once
 
#include "../ecs/system.hpp"
#include "../scene/transform.hpp"
#include "../scene/behaviour.hpp"
 
#include "rigidbody.hpp"
#include "collider.hpp"
#include "manifold.hpp"
#include "spatialhash.hpp"
#include "aabb.hpp"
#include "obb.hpp"
 
namespace Engine::Physics {
    class PhysicSystem : public ECS::System {
        private:
            int maxIterations = MAX_PHYSICS_ITERATIONS;
            double physicsTime = 0.0f;

            glm::vec2 gravity = {0.0f, 9.81f};

            void ApplyMotion(float dt);
            void ResolveCollisions(float dt);

            CollisionManifold CheckAABBCollision(const AABB& a, const AABB& b);
            CollisionManifold CheckOBBCollision(const OBB& a, const OBB& b);
            glm::vec2 Reflect(const glm::vec2& velocity, const glm::vec2& normal);

            SpatialHash BuildSpatialHash(const std::vector<EntityID>& collidableIDs);

            std::vector<std::pair<EntityID, EntityID>> GenerateBroadPhasePairs(SpatialHash spatialHash);
        public:        
            void OnFixedUpdate(float deltaTime) override;
    };
}