WorldSystem/Systems/Trigger.cpp

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#include "Trigger.hpp"
#include "Physics/Triggers/Trigger.hpp"
#include "WorldSystem/Components.hpp"
#include "WorldSystem/Systems/Physics.hpp"
 
namespace Cori {
    namespace World {
        namespace Systems {
            void Trigger::OnTickUpdate(Core::GameTimer& gameTimer) {
                CORI_PROFILE_FUNCTION();
 
                auto system = m_Owner.GetSystem<PhysicsSystem>();
                if (system) {
                    auto locked = system->lock();
                        StaticEntityView view = m_Owner.StaticView<Components::Entity::Trigger>(Exclude<Components::Entity::InactiveLocallyFlag>());
 
                        for (const auto entity : view) {
                            view.Get<Components::Entity::Trigger>(entity).OnTickUpdate(gameTimer.GetTimestep());
                        }
 
                        auto [beginEvents, endEvents, beginCount, endCount] = locked->GetWorld().GetSensorEvents();
 
                        for (int32_t i = 0; i < beginCount; ++i) {
                            const b2SensorBeginTouchEvent* beginTouch = beginEvents + i;
 
                            Entity& visitor = static_cast<Physics::BodyUserData*>(static_cast<Physics::ShapeRef>(beginTouch->visitorShapeId).GetBody().GetUserData())->m_Entity;
 
                            Entity& trigger = static_cast<Physics::BodyUserData*>(static_cast<Physics::ShapeRef>(beginTouch->sensorShapeId).GetBody().GetUserData())->m_Entity;
 
                            if (trigger.IsActiveGlobally()) {
                                trigger.GetComponents<Components::Entity::Trigger>().OnEnter(visitor);
                            }
                        }
 
                        for (int32_t i = 0; i < endCount; ++i) {
                            const b2SensorEndTouchEvent* endTouch = endEvents + i;
 
                            Entity& visitor = static_cast<Physics::BodyUserData*>(static_cast<Physics::ShapeRef>(endTouch->visitorShapeId).GetBody().GetUserData())->m_Entity;
 
                            Entity& trigger = static_cast<Physics::BodyUserData*>(static_cast<Physics::ShapeRef>(endTouch->sensorShapeId).GetBody().GetUserData())->m_Entity;
 
                            if (trigger.IsActiveGlobally()) {
                                trigger.GetComponents<Components::Entity::Trigger>().OnExit(visitor);
                            }
                        }
                }
            }
 
            bool Trigger::Create() {
                m_Owner.GetRegistry().on_construct<Physics::BodyUserData>().connect<&Trigger::OnBodyUserDataCreate>(this);
                m_Owner.GetRegistry().on_construct<Components::Entity::Trigger>().connect<&Trigger::OnTriggerCreate>(this);
                return true;
            }
 
            void Trigger::OnBodyUserDataCreate(entt::registry& registry, entt::entity entity) {
                Entity e = entt::handle{ registry, entity };
                auto& bud = e.GetComponents<Physics::BodyUserData>();
                bud.m_Entity = e;
            }
 
            void Trigger::OnTriggerCreate(entt::registry& registry, entt::entity entity) {
                Entity e = entt::handle{ registry, entity };
                auto& tr = e.GetComponents<Components::Entity::Trigger>();
                auto& ud = e.GetOrAddComponent<Physics::BodyUserData>();
                ud.m_Entity = e;
                auto& rb = e.GetComponents<Components::Entity::RigidBody>();
                rb.SetUserData(&ud);
                tr.m_Trigger = e;
            }
        }
    }
}