Application.cpp

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#define BS_THREAD_POOL_NATIVE_EXTENSIONS
 
#include <format>
 
#include <BS_thread_pool.hpp>
#include <entt/signal/dispatcher.hpp>
#include <glad/glad.h>
#include <mimalloc.h>
#include <SDL3/SDL.h>
#include <sol/sol.hpp>
 
#include "galaxy/core/Config.hpp"
#include "galaxy/core/Window.hpp"
#include "galaxy/core/Settings.hpp"
#include "galaxy/fs/VirtualFileSystem.hpp"
#include "galaxy/graphics/gl/Sampler.hpp"
#include "galaxy/input/Keyboard.hpp"
#include "galaxy/input/Mouse.hpp"
#include "galaxy/logging/ConsoleSink.hpp"
#include "galaxy/logging/FileSink.hpp"
#include "galaxy/logging/Log.hpp"
#include "galaxy/lua/Lua.hpp"
#include "galaxy/meta/SystemFactory.hpp"
#include "galaxy/platform/Platform.hpp"
#include "galaxy/scene/SceneManager.hpp"
#include "galaxy/time/Time.hpp"
 
#include "Application.hpp"
 
using namespace std::chrono_literals;
 
namespace galaxy
{
    App::App(const std::string& config_file)
    {
        SDL_SetMemoryFunctions(&mi_malloc, &mi_calloc, &mi_realloc, &mi_free);
 
        setup_async();
        setup_logging();
        setup_config(config_file);
        setup_platform();
        setup_fs();
        setup_rendering();
        setup_events();
        setup_input();
        // setup_nuklear();
        // setup_loader();
        setup_meta();
        setup_services();
        setup_scripting();
 
        // Load game assets.
        // core::entt::locator<core::Loader>::ref().load_all();
    }
 
    App::~App()
    {
        entt::locator<VirtualFileSystem>::reset();
        entt::locator<Config>::reset();
 
        GALAXY_LOG(GALAXY_INFO, "Application closed.");
        entt::locator<BS::priority_thread_pool>::value().wait();
 
        entt::locator<Log>::reset();
        entt::locator<BS::priority_thread_pool>::reset();
 
        SDL_Quit();
    }
 
    /*void App::load()
    {
        const auto path = Settings::root_dir() / Settings::asset_pack();
 
        auto& sm = entt::locator<scene::SceneManager>::value();
        sm.load_app(path.string());
    }*/
 
    void App::run()
    {
        // https://stackoverflow.com/a/59446610
        // We dont need 't' or 'alpha/render' sections.
 
        auto& window = entt::locator<Window>::value();
        auto& scenes = entt::locator<SceneManager>::value();
 
        // The expression dt/1s simply converts the double-based chrono seconds
        // into a double so it can participate in the physics computation.
        constexpr const auto dt = std::chrono::duration<long long, std::ratio<1, 60>> {1};
        time::dt(dt / 1.0s);
 
        using clock      = std::chrono::steady_clock;
        using duration   = decltype(clock::duration {} + dt);
        using time_point = std::chrono::time_point<clock, duration>;
 
        duration   accum = 0s;
        time_point prev  = clock::now();
        time_point now   = clock::now();
 
        auto     updates = 0u;
        auto     frames  = 0u;
        duration perf    = 0s;
 
        if (!m_update)
        {
            m_update = [&](App* app) {
                while (SDL_PollEvent(&m_events))
                {
                    switch (m_events.type)
                    {
                        case SDL_EVENT_QUIT:
                            window.close();
                            break;
 
                        case SDL_EVENT_WINDOW_CLOSE_REQUESTED:
                            if (m_events.window.windowID == SDL_GetWindowID(window.handle()))
                            {
                                window.close();
                            }
                            break;
 
                        default:
                            scenes.on_event(m_events);
                            break;
                    }
                }
 
                scenes.update();
            };
        }
 
        if (!m_render)
        {
            m_render = [&](App* app) {
                scenes.render();
                window.swap();
            };
        }
 
        while (window.is_open())
        {
            now          = clock::now();
            auto elapsed = now - prev;
 
            // 250ms is the limit put in place on the frame time to cope with the spiral of death.
            // It doesn't have to be 250ms exactly but it should be sufficiently high enough to deal with spikes in load.
            if (elapsed > 250ms)
            {
                elapsed = 250ms;
            }
 
            prev   = now;
            accum += elapsed;
 
            while (accum >= dt)
            {
                perf  += dt;
                accum -= dt;
 
                m_update(this);
 
                updates++;
            }
 
            m_render(this);
 
            frames++;
 
            if (perf >= 1s)
            {
                window.append_title(std::format(" | UPS: {0}, FPS: {1}", updates, frames));
 
                frames  = 0;
                updates = 0;
                perf    = 0s;
            }
        }
    }
 
    void App::set_update_func(LoopFunc&& update)
    {
        m_update = std::move(update);
    }
 
    void App::set_render_func(LoopFunc&& render)
    {
        m_render = std::move(render);
    }
 
    SDL_Event& App::events() noexcept
    {
        return m_events;
    }
 
    void App::setup_async()
    {
        // Configure threadpool.
 
        // Calc threads.
        // We optimize for 6: 1 for audio, 1 for main, 4 for tasks.
        auto system_cores = std::thread::hardware_concurrency();
        if (system_cores < 6)
        {
            system_cores = std::thread::hardware_concurrency();
        }
 
        // Check for highest available priority.
        BS::set_os_process_priority(BS::os_process_priority::high);
        entt::locator<BS::priority_thread_pool>::emplace(system_cores, [](const std::size_t idx) {
            BS::this_thread::set_os_thread_priority(BS::os_thread_priority::highest);
        });
    }
 
    void App::setup_logging()
    {
        platform::configure_terminal();
        if (!std::filesystem::exists(Settings::log_dir()))
        {
            std::filesystem::create_directory(Settings::log_dir());
        }
        entt::locator<Log>::emplace();
 
        const auto path = std::format("{0}{1}{2}", Settings::log_dir(), std::format("{0:%d-%m-%Y-[%H-%M]}", time::now()), ".log");
        GALAXY_ADD_SINK(FileSink, path);
 
        GALAXY_ADD_SINK(ConsoleSink);
        GALAXY_LOG(GALAXY_INFO, "App started.");
    }
 
    void App::setup_config(std::string_view config_file)
    {
        auto& config = entt::locator<Config>::emplace(config_file);
        Settings::set_config_to_default();
        Settings::set_settings_from_config();
    }
 
    void App::setup_platform()
    {
        platform::seed_random();
 
        platform::set_metadata(SDL_PROP_APP_METADATA_NAME_STRING, Settings::title().c_str());
        platform::set_metadata(SDL_PROP_APP_METADATA_VERSION_STRING, Settings::version().c_str());
        platform::set_metadata(SDL_PROP_APP_METADATA_IDENTIFIER_STRING, Settings::identifier().c_str());
        platform::set_metadata(SDL_PROP_APP_METADATA_CREATOR_STRING, Settings::creator().c_str());
        platform::set_metadata(SDL_PROP_APP_METADATA_COPYRIGHT_STRING, Settings::copyright().c_str());
        platform::set_metadata(SDL_PROP_APP_METADATA_URL_STRING, Settings::website().c_str());
        platform::set_metadata(SDL_PROP_APP_METADATA_TYPE_STRING, "game");
 
        platform::set_hint(SDL_HINT_ALLOW_ALT_TAB_WHILE_GRABBED, "1");
        platform::set_hint(SDL_HINT_ASSERT, "break");
        platform::set_hint(SDL_HINT_AUDIO_CATEGORY, "playback");
        platform::set_hint(SDL_HINT_AUDIO_CHANNELS, "2");
        platform::set_hint(SDL_HINT_AUDIO_INCLUDE_MONITORS, "0");
        platform::set_hint(SDL_HINT_AUTO_UPDATE_JOYSTICKS, "1");
        platform::set_hint(SDL_HINT_AUTO_UPDATE_SENSORS, "1");
        platform::set_hint(SDL_HINT_LOGGING, "warn");
        platform::set_hint(SDL_HINT_ENABLE_SCREEN_KEYBOARD, "0");
        platform::set_hint(SDL_HINT_EVENT_LOGGING, "0");
        platform::set_hint(SDL_HINT_FRAMEBUFFER_ACCELERATION, "opengl");
        platform::set_hint(SDL_HINT_GAMECONTROLLER_SENSOR_FUSION, "1");
        platform::set_hint(SDL_HINT_GPU_DRIVER, "vulkan");
        platform::set_hint(SDL_HINT_HIDAPI_ENUMERATE_ONLY_CONTROLLERS, "1");
        platform::set_hint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "0");
        platform::set_hint(SDL_HINT_JOYSTICK_DIRECTINPUT, "1");
        platform::set_hint(SDL_HINT_TV_REMOTE_AS_JOYSTICK, "1");
        platform::set_hint(SDL_HINT_MOUSE_AUTO_CAPTURE, "0");
        platform::set_hint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1");
        platform::set_hint(SDL_HINT_MOUSE_RELATIVE_MODE_CENTER, "0");
        platform::set_hint(SDL_HINT_MOUSE_TOUCH_EVENTS, "1");
        platform::set_hint(SDL_HINT_MOUSE_DPI_SCALE_CURSORS, "1");
        platform::set_hint(SDL_HINT_PEN_MOUSE_EVENTS, "1");
        platform::set_hint(SDL_HINT_PEN_TOUCH_EVENTS, "1");
        platform::set_hint(SDL_HINT_QUIT_ON_LAST_WINDOW_CLOSE, "1");
        platform::set_hint(SDL_HINT_RENDER_DRIVER, "opengl");
        platform::set_hint(SDL_HINT_RENDER_GPU_DEBUG, "0");
        platform::set_hint(SDL_HINT_RENDER_GPU_LOW_POWER, "0");
        platform::set_hint(SDL_HINT_TOUCH_MOUSE_EVENTS, "1");
        platform::set_hint(SDL_HINT_TRACKPAD_IS_TOUCH_ONLY, "0");
        platform::set_hint(SDL_HINT_THREAD_FORCE_REALTIME_TIME_CRITICAL, "0");
        platform::set_hint(SDL_HINT_XINPUT_ENABLED, "1");
        platform::set_hint(SDL_HINT_VIDEO_ALLOW_SCREENSAVER, "0");
        platform::set_hint(SDL_HINT_VIDEO_DUMMY_SAVE_FRAMES, "0");
        platform::set_hint(SDL_HINT_VIDEO_MATCH_EXCLUSIVE_MODE_ON_MOVE, "1");
        platform::set_hint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "0");
        platform::set_hint(SDL_HINT_VIDEO_OFFSCREEN_SAVE_FRAMES, "0");
        platform::set_hint(SDL_HINT_VIDEO_SYNC_WINDOW_OPERATIONS, "0");
        platform::set_hint(SDL_HINT_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN, "1");
        platform::set_hint(SDL_HINT_WINDOWS_CLOSE_ON_ALT_F4, "1");
        platform::set_hint(SDL_HINT_WINDOWS_ENABLE_MENU_MNEMONICS, "0");
        platform::set_hint(SDL_HINT_WINDOWS_GAMEINPUT, "1");
        platform::set_hint(SDL_HINT_WINDOWS_RAW_KEYBOARD, "0");
        // TODO: platform::set_hint(SDL_HINT_IME_IMPLEMENTED_UI, "0");
 
        const auto vsync = Settings::vsync() ? "1" : "0";
        platform::set_hint(SDL_HINT_RENDER_VSYNC, vsync);
 
        const auto audio_freq = std::to_string(Settings::audio_freq());
        platform::set_hint(SDL_HINT_AUDIO_FREQUENCY, audio_freq.c_str());
 
        if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_JOYSTICK | SDL_INIT_GAMEPAD | SDL_INIT_EVENTS | SDL_INIT_HAPTIC | SDL_INIT_SENSOR))
        {
            GALAXY_LOG(GALAXY_FATAL, SDL_GetError());
        }
    }
 
    void App::setup_fs()
    {
        entt::locator<VirtualFileSystem>::emplace();
    }
 
    void App::setup_rendering()
    {
        auto& window = entt::locator<Window>::emplace();
 
        window.set_icon(Settings::window_icon());
        window.show();
 
        auto& sampler = entt::locator<Sampler>::emplace();
 
        // Need to create our default texture sampler object.
        if (Settings::mipmap())
        {
            switch (Settings::texture_filter())
            {
                case GLTextureFilter::NEAREST:
                    sampler.set(GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
                    sampler.set(GL_TEXTURE_MAG_FILTER, GL_NEAREST);
                    break;
                case GLTextureFilter::BILINEAR:
                    sampler.set(GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
                    sampler.set(GL_TEXTURE_MAG_FILTER, GL_LINEAR);
                    break;
                case GLTextureFilter::TRILINEAR:
                    sampler.set(GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
                    sampler.set(GL_TEXTURE_MAG_FILTER, GL_LINEAR);
                    break;
            }
        }
        else
        {
            if (Settings::texture_filter() == GLTextureFilter::NEAREST)
            {
                sampler.set(GL_TEXTURE_MIN_FILTER, GL_NEAREST);
                sampler.set(GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            }
            else
            {
                sampler.set(GL_TEXTURE_MIN_FILTER, GL_LINEAR);
                sampler.set(GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            }
        }
 
        auto ansio = std::clamp(Settings::ansiotrophy(), 1, 16);
        if (ansio == 3)
        {
            ansio = 4;
        }
        else if (ansio > 4 && ansio < 8)
        {
            ansio = 8;
        }
        else
        {
            ansio = 16;
        }
        sampler.setf(GL_TEXTURE_MAX_ANISOTROPY, static_cast<float>(ansio));
 
        sampler.set(GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        sampler.set(GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        sampler.set(GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
        sampler.set(GL_TEXTURE_LOD_BIAS, GL_NONE);
    }
 
    void App::setup_events()
    {
        SDL_zero(m_events);
    }
 
    void App::setup_input()
    {
        auto& keyboard = entt::locator<Keyboard>::emplace();
        auto& mouse    = entt::locator<Mouse>::emplace();
 
        mouse.set_cursor_custom(Settings::cursor_icon(), Settings::cursor_hotspot());
        if (Settings::cursor_show())
        {
            mouse.show_cursor();
        }
        else
        {
            mouse.hide_cursor();
        }
    }
 
    // void App::setup_nuklear()
    //{
    // auto& nui = ServiceLocator<ui::NuklearUI>::make();
    // }
 
    // void App::setup_loader()
    //{
    //  // entt::locator<Loader>::make();
    // }
 
    void App::setup_meta()
    {
        auto& sf = entt::locator<SystemFactory>::emplace();
        // auto& ef = entt::locator<meta::EntityFactory>::emplace();
 
        /*ef.register_component<components::Tag>("Tag");
 
        em.register_component<components::Animated>("Animated");
        em.register_component<components::Circle>("Circle");
        em.register_component<components::Ellipse>("Ellipse");
        em.register_component<components::Point>("Point");
        em.register_component<components::Polygon>("Polygon");
        em.register_component<components::Polyline>("Polyline");
        em.register_component<components::RigidBody>("RigidBody");
        em.register_component<components::Script>("Script");
        em.register_component<components::Sprite>("Sprite");
        em.register_component<components::Text>("Text");
        em.register_component<components::TileMap>("TileMap");
        em.register_component<components::Transform>("Transform");
        em.register_component<flags::DenySerialization>("DenySerialization");
        em.register_component<flags::Disabled>("Disabled");
 
        em.register_dependencies<components::Animated, components::Sprite>();
        em.register_dependencies<components::Circle, components::Transform>();
        em.register_dependencies<components::Ellipse, components::Transform>();
        em.register_dependencies<components::Point, components::Transform>();
        em.register_dependencies<components::Polygon, components::Transform>();
        em.register_dependencies<components::Polyline, components::Transform>();
        em.register_dependencies<components::RigidBody, components::Transform>();
        em.register_dependencies<components::Sprite, components::Transform>();
        em.register_dependencies<components::Text, components::Transform>();
        */
    }
 
    void App::setup_services()
    {
        // entt::locator<media::SoundEngine>::make(listener_count);
        // entt::locator<media::MusicEngine>::make(listener_count);
        // entt::locator<media::VoiceEngine>::make(listener_count);
        // entt::locator<resource::SoundCache>::make();
        // entt::locator<resource::MusicCache>::make();
        // entt::locator<resource::VoiceCache>::make();
        // entt::locator<resource::VideoCache>::make();
        // entt::locator<resource::Animations>::make();
        // entt::locator<resource::Shaders>::make();
        // entt::locator<resource::Fonts>::make();
        // entt::locator<resource::Textures>::make();
        // entt::locator<resource::Prefabs>::make();
        //    entt::locator<resource::Scripts>::make();
        entt::locator<SceneManager>::emplace();
    }
 
    void App::setup_scripting()
    {
        auto& lua = entt::locator<sol::state>::emplace();
        lua.open_libraries(sol::lib::base, sol::lib::package, sol::lib::coroutine, sol::lib::string, sol::lib::os, sol::lib::math, sol::lib::table, sol::lib::io, sol::lib::utf8);
 
        //
        // Add external libraries to Lua.
        // Inject all configured galaxy into Lua.
        // Add engine services to lua.
        //
        Lua::inject();
    }
} // namespace galaxy