Scene.cpp

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#include <entt/locator/locator.hpp>
#include <sol/sol.hpp>
 
#include "galaxy/events/GainedFocus.hpp"
#include "galaxy/events/KeyInput.hpp"
#include "galaxy/events/KeyPressed.hpp"
#include "galaxy/events/KeyReleased.hpp"
#include "galaxy/events/LostFocus.hpp"
#include "galaxy/events/MouseMoved.hpp"
#include "galaxy/events/MousePressed.hpp"
#include "galaxy/events/MouseReleased.hpp"
#include "galaxy/events/MouseWheel.hpp"
#include "galaxy/events/WindowResized.hpp"
 
#include "Scene.hpp"
 
namespace galaxy
{
    Scene::Scene(const std::string& name) noexcept
        : State {name}
    {
        /*
             auto& w = core::ServiceLocator<core::Window>::ref();
             m_camera.set_viewport(w.frame_width(), w.frame_height());
             auto& nui = core::ServiceLocator<ui::NuklearUI>::ref();
             m_dispatcher.sink<events::WindowResized>().connect<&Scene::on_window_resized>(this);
             m_dispatcher.sink<events::MousePressed>().connect<&ui::NuklearUI::on_mouse_pressed>(nui);
             m_dispatcher.sink<events::MouseWheel>().connect<&ui::NuklearUI::on_mouse_wheel>(nui);
             m_dispatcher.sink<events::KeyChar>().connect<&ui::NuklearUI::on_key_char>(nui);
             m_dispatcher.sink<events::KeyPress>().connect<&ui::NuklearUI::on_key_press>(nui);
             m_dispatcher.sink<events::ContentScale>().connect<&ui::NuklearUI::on_content_scale>(nui);
        */
    }
 
    Scene::~Scene() noexcept
    {
    }
 
    void Scene::on_push()
    {
    }
 
    void Scene::on_pop()
    {
        if (entt::locator<sol::state>::has_value())
        {
            entt::locator<sol::state>::value().collect_garbage();
        }
    }
 
    void Scene::on_event(SDL_Event& event)
    {
        /*for (auto& layer : std::views::reverse(m_LayerStack))
        {
            layer->OnEvent(event);
            if (event.Handled)
                break;
        }
 
        Core::EventDispatcher dispatcher(event);
        dispatcher.Dispatch<Core::MouseButtonPressedEvent>([this](Core::MouseButtonPressedEvent& e) { return OnMouseButtonPressed(e); });
        dispatcher.Dispatch<Core::MouseMovedEvent>([this](Core::MouseMovedEvent& e) { return OnMouseMoved(e); });
        dispatcher.Dispatch<Core::WindowClosedEvent>([this](Core::WindowClosedEvent& e) { return OnWindowClosed(e); });
 
        switch (event.type)
        {
            case SDL_EVENT_SCREEN_KEYBOARD_SHOWN:
            case SDL_EVENT_SCREEN_KEYBOARD_HIDDEN:
                break;
 
            case SDL_EVENT_LOCALE_CHANGED:
                // TODO: Handle Languages.
                break;
 
            case SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED:
            case SDL_EVENT_WINDOW_DISPLAY_SCALE_CHANGED:
              SDL_EVENT_DISPLAY_DESKTOP_MODE_CHANGED,  /**< Display has changed desktop mode
        //SDL_EVENT_DISPLAY_CURRENT_MODE_CHANGED,      /**< Display has changed current mode
        //  SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED, /**< Display has changed content scale
            //SDL_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED, /**< Display has changed usable bounds
                // SDL_GetDisplayContentScale
                // SDL_GetWindowDisplayScale
                // https://wiki.libsdl.org/SDL3/README-highdpi
                    float main_scale = SDL_GetDisplayContentScale(SDL_GetPrimaryDisplay());
                break;
 
            case SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED:
                // SDL_GetWindowSizeInPixels
                break;
 
            case SDL_EVENT_WINDOW_RESIZED:
            case SDL_EVENT_WINDOW_MAXIMIZED:
            case SDL_EVENT_WINDOW_RESTORED:
            case SDL_EVENT_WINDOW_ENTER_FULLSCREEN:
            case SDL_EVENT_WINDOW_LEAVE_FULLSCREEN:
            case SDL_EVENT_DISPLAY_USABLE_BOUNDS_CHANGED:
                {
                    const auto size = window.get_pixel_size();
                    dispatcher.enqueue<WindowResized>(size.x, size.y);
                }
                break;
 
            case SDL_EVENT_WINDOW_DISPLAY_CHANGED:
                // TODO
                // HANDLE RESIZE + DISPLAY SCALE + PIXEL SIZE SCALE.
                break;
 
            case SDL_EVENT_WINDOW_MOUSE_ENTER:
            case SDL_EVENT_WINDOW_FOCUS_GAINED:
                dispatcher.enqueue<GainedFocus>();
                break;
 
            case SDL_EVENT_WINDOW_MOUSE_LEAVE:
            case SDL_EVENT_WINDOW_FOCUS_LOST:
                dispatcher.enqueue<LostFocus>();
                break;
 
            case SDL_EVENT_KEY_DOWN:
                {
                    dispatcher.enqueue<KeyPressed>(
                        m_events.key.scancode,
                        static_cast<Keys>(m_events.key.key),
                        static_cast<KeyMods>(m_events.key.mod),
                        m_events.key.raw,
                        m_events.key.repeat
                    );
                }
                break;
 
            case SDL_EVENT_KEY_UP:
                {
                    dispatcher.enqueue<KeyReleased>(
                        m_events.key.scancode,
                        static_cast<Keys>(m_events.key.key),
                        static_cast<KeyMods>(m_events.key.mod),
                        m_events.key.raw,
                        m_events.key.repeat
                    );
                }
                break;
 
            case SDL_EVENT_TEXT_INPUT:
                // case SDL_EVENT_TEXT_EDITING:
                // case SDL_EVENT_TEXT_EDITING_CANDIDATES:
                {
                    auto text = std::string(m_events.text.text);
                    dispatcher.enqueue<KeyInput>(std::move(text));
                }
                break;
 
            case SDL_EVENT_MOUSE_MOTION:
                {
                    dispatcher.enqueue<MouseMoved>(m_events.motion.x, m_events.motion.y, m_events.motion.xrel, m_events.motion.yrel);
                }
                break;
 
            case SDL_EVENT_MOUSE_BUTTON_DOWN:
                {
                    dispatcher.enqueue<MousePressed>(m_events.button.x, m_events.button.y, m_events.button.clicks, static_cast<MouseButton>(m_events.button.button));
                }
                break;
 
            case SDL_EVENT_MOUSE_BUTTON_UP:
                {
                    dispatcher.enqueue<MouseReleased>(m_events.button.x, m_events.button.y, m_events.button.clicks, static_cast<MouseButton>(m_events.button.button));
                }
                break;
 
            case SDL_EVENT_MOUSE_WHEEL:
                {
                    dispatcher.enqueue<MouseWheel>(
                        m_events.wheel.x,
                        m_events.wheel.y,
                        m_events.wheel.direction,
                        m_events.wheel.mouse_x,
                        m_events.wheel.mouse_y,
                        m_events.wheel.integer_x,
                        m_events.wheel.integer_y
                    );
                }
                break;
 
            case SDL_EVENT_DROP_BEGIN:
                // TODO
                Drag and drop events
                SDL_EVENT_DROP_FILE = 0x1000, /**< The system requests a file open *
                SDL_EVENT_DROP_TEXT,      /**< text/plain drag-and-drop event *
                SDL_EVENT_DROP_BEGIN,     /**< A new set of drops is beginning (NULL filename) *
                SDL_EVENT_DROP_COMPLETE,  /**< Current set of drops is now complete (NULL filename) *
                SDL_EVENT_DROP_POSITION,  /**< Position while moving over the window
        // SDL_DropEvent
        break;
 
        case SDL_EVENT_JOYSTICK_AXIS_MOTION:
        case SDL_EVENT_JOYSTICK_BALL_MOTION:
        case SDL_EVENT_JOYSTICK_HAT_MOTION:
        case SDL_EVENT_JOYSTICK_BUTTON_DOWN:
        case SDL_EVENT_JOYSTICK_BUTTON_UP:
        case SDL_EVENT_JOYSTICK_REMOVED:
        case SDL_EVENT_JOYSTICK_BATTERY_UPDATED:
        case SDL_EVENT_JOYSTICK_UPDATE_COMPLETE:
            // TODO
            break;
 
        case SDL_EVENT_GAMEPAD_AXIS_MOTION:
        case SDL_EVENT_GAMEPAD_BUTTON_DOWN:
        case SDL_EVENT_GAMEPAD_BUTTON_UP:
        case SDL_EVENT_GAMEPAD_REMOVED:
        case SDL_EVENT_GAMEPAD_REMAPPED:
        case SDL_EVENT_GAMEPAD_TOUCHPAD_DOWN:
        case SDL_EVENT_GAMEPAD_TOUCHPAD_MOTION:
        case SDL_EVENT_GAMEPAD_TOUCHPAD_UP:
        case SDL_EVENT_GAMEPAD_SENSOR_UPDATE:
        case SDL_EVENT_GAMEPAD_UPDATE_COMPLETE:
        case SDL_EVENT_GAMEPAD_STEAM_HANDLE_UPDATED:
            // TODO
            break;
 
        case SDL_EVENT_FINGER_DOWN:
        case SDL_EVENT_FINGER_UP:
        case SDL_EVENT_FINGER_MOTION:
        case SDL_EVENT_FINGER_CANCELED:
            // TODO
            break;
 
        case SDL_EVENT_PEN_PROXIMITY_IN:
        case SDL_EVENT_PEN_PROXIMITY_OUT:
        case SDL_EVENT_PEN_DOWN:
        case SDL_EVENT_PEN_UP:
        case SDL_EVENT_PEN_BUTTON_DOWN:
        case SDL_EVENT_PEN_BUTTON_UP:
        case SDL_EVENT_PEN_MOTION:
        case SDL_EVENT_PEN_AXIS:
            // TODO
            break;
 
        default:
            break;
    }
    */
    }
 
    void Scene::update(EntityManager& em)
    {
        // make sure events are propagated from top to bottom.
        // make sure updting is from btm to top.
 
        // graphics::Renderer::ref().flush();
        // m_registry.update(m_b2world);
        // m_b2world.Step(GALAXY_DT, m_velocity_iterations, m_position_iterations);
        m_sysman.update(em, this);
    }
 
    void Scene::render()
    {
        // render scene
        // then any ui layers.
 
        /*
            graphics::Renderer::ref().begin_post();
 
            // Scene specific.
            graphics::Renderer::ref().submit_camera(m_camera);
            graphics::Renderer::ref().draw();
 
            graphics::Renderer::ref().end_post();
            graphics::Renderer::ref().begin_default();
            graphics::Renderer::ref().render_post();
            graphics::Renderer::ref().end_default();
 
            // Scene specific.
            auto& nui = core::ServiceLocator<ui::NuklearUI>::ref();
 
            nui.new_frame();
            update_ui();
            nui.render();
 
            graphics::Renderer::ref().end_default();
            */
    }
 
    SystemManager& Scene::sys_man() noexcept
    {
        return m_sysman;
    }
 
    /*void Scene::update_ui()
        {
            const auto view = m_registry.m_entt.view<components::GUI>(entt::exclude<flags::Disabled>);
            for (auto&& [entity, gui] : view.each())
            {
                if (gui.m_update.valid())
                {
                    gui.m_update(gui.m_self);
                }
            }
        }
        bool Scene::load_world(const std::string& file)
        {
            if (m_world.load(file))
            {
                m_world.parse();
                return true;
            }
 
            return false;
        }
 
    nlohmann::json Scene::serialize()
    {
        json["camera"]  = m_camera.serialize();
        json["physics"] = nlohmann::json::object();
        auto& physics   = json.at("physics");
 
        auto gravity            = m_b2world.GetGravity();
        physics["gravity"]["x"] = gravity.x;
        physics["gravity"]["y"] = gravity.y;
 
        physics["allow_sleeping"]        = m_b2world.GetAllowSleeping();
        physics["allow_autoclearforces"] = m_b2world.GetAutoClearForces();
        physics["velocity_iterations"]   = m_velocity_iterations;
        physics["position_iterations"]   = m_position_iterations;
        json["name"]                     = m_name;
        json["ldtk_world"]               = m_world.file();
        json["current_map"]              = m_world.get_active() ? m_world.get_active()->name() : "";
        nlohmann::json json              = "{}"_json;
        json["camera"]                   = m_camera.serialize();
        json["entities"]                 = nlohmann::json::array();
 
        auto& em = core::ServiceLocator<meta::EntityMeta>::ref();
 
        for (const auto& [entity] : m_registry.m_entt.view<entt::entity>(entt::exclude<flags::DenySerialization>).each())
        {
            json["entities"].push_back(em.serialize_entity(entity, m_registry.m_entt));
        }
 
        json["physics"] = nlohmann::json::object();
        auto& physics   = json.at("physics");
 
        auto gravity            = m_b2world.GetGravity();
        physics["gravity"]["x"] = gravity.x;
        physics["gravity"]["y"] = gravity.y;
 
        physics["allow_sleeping"]        = m_b2world.GetAllowSleeping();
        physics["allow_autoclearforces"] = m_b2world.GetAutoClearForces();
        physics["velocity_iterations"]   = m_velocity_iterations;
        physics["position_iterations"]   = m_position_iterations;
        json["name"]                     = m_name;
        json["ldtk_world"]               = m_world.file();
        json["current_map"]              = m_world.get_active() ? m_world.get_active()->name() : "";
 
        nlohmann::json json = "{}"_json;
        json["name"]        = m_name;
 
        json["systems"] = nlohmann::json::object();
        for (auto i = 0; i < m_systems.size(); i++)
        {
            json["systems"][std::to_string(i)] = m_systems[i]->id();
        }
 
        return json;
    }
 
    void Scene::deserialize(const nlohmann::json& json)
    {
        m_name = json.at("name");
 
        const auto& systems = json.at("systems");
        m_systems.reserve(systems.size());
        for (const auto& [index, name] : systems.items())
        {
            add_system(name.get<std::string>());
        }
 
        m_camera.deserialize(json.at("camera"));
        auto& em = core::ServiceLocator<meta::EntityMeta>::ref();
 
        const auto& physics = json.at("physics");
        const auto& gravity = physics.at("gravity");
 
        m_b2world.SetGravity({gravity.at("x"), gravity.at("y")});
        m_b2world.SetAllowSleeping(physics.at("allow_sleeping"));
        m_b2world.SetAutoClearForces(physics.at("allow_autoclearforces"));
        m_velocity_iterations = physics.at("velocity_iterations");
        m_position_iterations = physics.at("position_iterations");
 
        if (load_world(json.at("ldtk_world")))
        {
            m_world.set_active(json.at("current_map"));
        }
        m_camera.deserialize(json.at("camera"));
        auto& em = core::ServiceLocator<meta::EntityMeta>::ref();
 
        m_registry.clear();
 
        const auto& physics = json.at("physics");
        const auto& gravity = physics.at("gravity");
 
        m_b2world.SetGravity({gravity.at("x"), gravity.at("y")});
        m_b2world.SetAllowSleeping(physics.at("allow_sleeping"));
        m_b2world.SetAutoClearForces(physics.at("allow_autoclearforces"));
        m_velocity_iterations = physics.at("velocity_iterations");
        m_position_iterations = physics.at("position_iterations");
 
        const auto& entity_json = json.at("entities");
        for (const auto& data : entity_json)
        {
            const auto entity = em.deserialize_entity(data, m_registry.m_entt);
 
            if (!m_registry.m_entt.all_of<components::Tag>(entity))
            {
                auto& tag = m_registry.m_entt.emplace<components::Tag>(entity);
                tag.m_tag = "Untagged";
            }
        }
 
        m_name = json.at("name");
 
        if (load_world(json.at("ldtk_world")))
        {
            m_world.set_active(json.at("current_map"));
        }
    }
 
    */
} // namespace galaxy