ladybird/Userland/Applications/3DFileViewer/main.cpp

/*
 * Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
 * Copyright (c) 2022, the SerenityOS developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibCore/ArgsParser.h>
#include <LibCore/ElapsedTimer.h>
#include <LibCore/System.h>
#include <LibFileSystemAccessClient/Client.h>
#include <LibGL/GL/gl.h>
#include <LibGL/GLContext.h>
#include <LibGUI/ActionGroup.h>
#include <LibGUI/Application.h>
#include <LibGUI/FilePicker.h>
#include <LibGUI/Icon.h>
#include <LibGUI/Label.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Menubar.h>
#include <LibGUI/MessageBox.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Widget.h>
#include <LibGUI/Window.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Palette.h>
#include <LibMain/Main.h>

#include "Mesh.h"
#include "WavefrontOBJLoader.h"

class GLContextWidget final : public GUI::Frame {
    C_OBJECT(GLContextWidget);

public:
    bool load_file(String const& filename, NonnullOwnPtr<Core::File> file);
    void toggle_rotate_x() { m_rotate_x = !m_rotate_x; }
    void toggle_rotate_y() { m_rotate_y = !m_rotate_y; }
    void toggle_rotate_z() { m_rotate_z = !m_rotate_z; }
    void set_rotation_speed(float speed) { m_rotation_speed = speed; }
    void set_stat_label(RefPtr<GUI::Label> l) { m_stats = l; }
    void set_wrap_s_mode(GLint mode) { m_wrap_s_mode = mode; }
    void set_wrap_t_mode(GLint mode) { m_wrap_t_mode = mode; }
    void set_texture_scale(float scale) { m_texture_scale = scale; }
    void set_texture_enabled(bool texture_enabled) { m_texture_enabled = texture_enabled; }
    void set_mag_filter(GLint filter) { m_mag_filter = filter; }

    void toggle_show_frame_rate()
    {
        m_show_frame_rate = !m_show_frame_rate;
        m_stats->set_visible(m_show_frame_rate);
    }

private:
    GLContextWidget()
        : m_mesh_loader(adopt_own(*new WavefrontOBJLoader()))
    {
        constexpr u16 RENDER_WIDTH = 640;
        constexpr u16 RENDER_HEIGHT = 480;
        m_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRx8888, { RENDER_WIDTH, RENDER_HEIGHT }).release_value_but_fixme_should_propagate_errors();
        m_context = MUST(GL::create_context(*m_bitmap));
        m_framerate_timer = Core::ElapsedTimer::start_new();

        start_timer(15);

        GL::make_context_current(m_context);
        glFrontFace(GL_CCW);
        glEnable(GL_CULL_FACE);
        glEnable(GL_DEPTH_TEST);

        // Enable lighting
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glEnable(GL_LIGHT1);
        glEnable(GL_LIGHT2);

        // Set projection matrix
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();

        auto const half_aspect_ratio = static_cast<double>(RENDER_WIDTH) / RENDER_HEIGHT / 2;
        glFrustum(-half_aspect_ratio, half_aspect_ratio, -0.5, 0.5, 1, 1500);

        m_init_list = glGenLists(1);
        glNewList(m_init_list, GL_COMPILE);
        {
            glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
            glClearDepth(1.0);
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        }
        glEndList();
    }

    virtual void drag_enter_event(GUI::DragEvent&) override;
    virtual void drop_event(GUI::DropEvent&) override;
    virtual void paint_event(GUI::PaintEvent&) override;
    virtual void resize_event(GUI::ResizeEvent&) override;
    virtual void timer_event(Core::TimerEvent&) override;
    virtual void mousemove_event(GUI::MouseEvent&) override;
    virtual void mousewheel_event(GUI::MouseEvent&) override;
    virtual void keydown_event(GUI::KeyEvent&) override;

private:
    static constexpr u32 UPDATE_FRAMERATE_EVERY_FRAMES = 30;

    RefPtr<Mesh> m_mesh;
    RefPtr<Gfx::Bitmap> m_bitmap;
    OwnPtr<GL::GLContext> m_context;
    NonnullOwnPtr<WavefrontOBJLoader> m_mesh_loader;
    Core::ElapsedTimer m_framerate_timer;
    GLuint m_init_list { 0 };
    bool m_rotate_x = true;
    bool m_rotate_y = false;
    bool m_rotate_z = true;
    float m_angle_x = 0.0;
    float m_angle_y = 0.0;
    float m_angle_z = 0.0;
    Gfx::IntPoint m_last_mouse;
    float m_rotation_speed = 60.f;
    bool m_show_frame_rate = false;
    int m_cycles = 0;
    RefPtr<GUI::Label> m_stats;
    GLint m_wrap_s_mode = GL_REPEAT;
    GLint m_wrap_t_mode = GL_REPEAT;
    bool m_texture_enabled { true };
    float m_texture_scale = 1.0f;
    GLint m_mag_filter = GL_NEAREST;
    float m_zoom = 1;
};

void GLContextWidget::drag_enter_event(GUI::DragEvent& event)
{
    auto const& mime_types = event.mime_types();
    if (mime_types.contains_slow("text/uri-list"sv))
        event.accept();
}

void GLContextWidget::drop_event(GUI::DropEvent& event)
{
    if (!event.mime_data().has_urls())
        return;

    event.accept();

    if (event.mime_data().urls().is_empty())
        return;

    for (auto& url : event.mime_data().urls()) {
        if (url.scheme() != "file")
            continue;

        auto response = FileSystemAccessClient::Client::the().request_file_read_only_approved(window(), url.serialize_path());
        if (response.is_error())
            return;
        load_file(response.value().filename(), response.value().release_stream());
    }
}

void GLContextWidget::paint_event(GUI::PaintEvent& event)
{
    GUI::Frame::paint_event(event);

    GUI::Painter painter(*this);
    painter.add_clip_rect(event.rect());
    painter.draw_scaled_bitmap(frame_inner_rect(), *m_bitmap, m_bitmap->rect());
}

void GLContextWidget::resize_event(GUI::ResizeEvent& event)
{
    GUI::Frame::resize_event(event);

    if (m_stats)
        m_stats->set_x(width() - m_stats->width() - 6);
}

void GLContextWidget::mousemove_event(GUI::MouseEvent& event)
{
    if (event.buttons() == GUI::MouseButton::Primary) {
        int delta_x = m_last_mouse.x() - event.x();
        int delta_y = m_last_mouse.y() - event.y();

        m_angle_x -= delta_y / 2.0f;
        m_angle_y -= delta_x / 2.0f;
    }

    m_last_mouse = event.position();
}

void GLContextWidget::mousewheel_event(GUI::MouseEvent& event)
{
    if (event.wheel_delta_y() > 0)
        m_zoom /= 1.1f;
    else
        m_zoom *= 1.1f;
}

void GLContextWidget::keydown_event(GUI::KeyEvent& event)
{
    if (event.key() == Key_Escape && window()->is_fullscreen()) {
        window()->set_fullscreen(false);
        return;
    }

    event.ignore();
}

void GLContextWidget::timer_event(Core::TimerEvent&)
{
    static unsigned int light_counter = 0;

    glCallList(m_init_list);

    if (m_rotate_x)
        m_angle_x -= m_rotation_speed * 0.01f;
    if (m_rotate_y)
        m_angle_y -= m_rotation_speed * 0.01f;
    if (m_rotate_z)
        m_angle_z -= m_rotation_speed * 0.01f;
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0, 0, -8.5);
    glRotatef(m_angle_x, 1, 0, 0);
    glRotatef(m_angle_y, 0, 1, 0);
    glRotatef(m_angle_z, 0, 0, 1);

    glPushMatrix();
    glLoadIdentity();
    // Disco time ;)
    GLfloat const light0_position[4] = { -4.0f, 0.0f, 0.0f, 0.0f };
    GLfloat const light0_diffuse[4] = { 1.0f, 0.0f, 0.0f, 0.0f };
    GLfloat const light0_specular[4] = { 0.75f, 0.75f, 0.75f };
    GLfloat const light1_position[4] = { 4.0f, 0.0f, 0.0f, 0.0f };
    GLfloat const light1_diffuse[4] = { 0.0f, 1.0f, 0.0f, 0.0f };
    GLfloat const light1_specular[4] = { 0.75f, 0.75f, 0.75f };
    GLfloat const light2_position[4] = { 0.0f, 5.0f, 0.0f, 0.0f };
    GLfloat const light2_diffuse[4] = { 0.0f, 0.0f, 1.0f, 0.0f };
    GLfloat const light2_specular[4] = { 0.75f, 0.75f, 0.75f };
    glLightfv(GL_LIGHT0, GL_POSITION, &light0_position[0]);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, &light0_diffuse[0]);
    glLightfv(GL_LIGHT0, GL_SPECULAR, &light0_specular[0]);
    glLightfv(GL_LIGHT1, GL_POSITION, &light1_position[0]);
    glLightfv(GL_LIGHT1, GL_DIFFUSE, &light1_diffuse[0]);
    glLightfv(GL_LIGHT1, GL_SPECULAR, &light1_specular[0]);
    glLightfv(GL_LIGHT2, GL_POSITION, &light2_position[0]);
    glLightfv(GL_LIGHT2, GL_DIFFUSE, &light2_diffuse[0]);
    glLightfv(GL_LIGHT2, GL_SPECULAR, &light2_specular[0]);

    GLfloat const material_specular_color[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
    glMaterialf(GL_FRONT, GL_SHININESS, 45.0f);
    glMaterialfv(GL_FRONT, GL_SPECULAR, &material_specular_color[0]);
    glPopMatrix();

    if (m_texture_enabled) {
        glEnable(GL_TEXTURE_2D);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, m_wrap_s_mode);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, m_wrap_t_mode);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, m_mag_filter);
    } else {
        glDisable(GL_TEXTURE_2D);
    }
    glScalef(m_zoom, m_zoom, m_zoom);

    if (!m_mesh.is_null())
        m_mesh->draw(m_texture_scale);

    m_context->present();

    if ((m_cycles % UPDATE_FRAMERATE_EVERY_FRAMES) == 0) {
        auto render_time = static_cast<double>(m_framerate_timer.elapsed_milliseconds()) / UPDATE_FRAMERATE_EVERY_FRAMES;
        auto frame_rate = render_time > 0 ? 1000 / render_time : 0;
        m_stats->set_text(String::formatted("{:.0f} fps, {:.1f} ms", frame_rate, render_time).release_value_but_fixme_should_propagate_errors());
        m_framerate_timer = Core::ElapsedTimer::start_new();

        glEnable(GL_LIGHT0);
        glEnable(GL_LIGHT1);
        glEnable(GL_LIGHT2);
        light_counter++;

        if ((light_counter % 3) == 0)
            glDisable(GL_LIGHT0);
        else if ((light_counter % 3) == 1)
            glDisable(GL_LIGHT1);
        else
            glDisable(GL_LIGHT2);
    }

    update();
    m_cycles++;
}

bool GLContextWidget::load_file(String const& filename, NonnullOwnPtr<Core::File> file)
{
    if (!filename.bytes_as_string_view().ends_with(".obj"sv)) {
        GUI::MessageBox::show(window(), DeprecatedString::formatted("Opening \"{}\" failed: invalid file type", filename), "Error"sv, GUI::MessageBox::Type::Error);
        return false;
    }

    auto new_mesh = m_mesh_loader->load(filename, move(file));
    if (new_mesh.is_error()) {
        GUI::MessageBox::show(window(), DeprecatedString::formatted("Reading \"{}\" failed: {}", filename, new_mesh.release_error()), "Error"sv, GUI::MessageBox::Type::Error);
        return false;
    }

    // Determine whether or not a texture for this model resides within the same directory
    StringBuilder builder;
    builder.append(filename.bytes_as_string_view().split_view('.').at(0));
    builder.append(".bmp"sv);

    // Attempt to open the texture file from disk
    RefPtr<Gfx::Bitmap> texture_image;
    auto response = FileSystemAccessClient::Client::the().request_file_read_only_approved(window(), builder.string_view());
    if (!response.is_error()) {
        auto texture_file = response.release_value();
        auto bitmap_or_error = Gfx::Bitmap::load_from_file(texture_file.release_stream(), texture_file.filename());
        if (!bitmap_or_error.is_error())
            texture_image = bitmap_or_error.release_value_but_fixme_should_propagate_errors();
    }

    GLuint tex;
    glGenTextures(1, &tex);
    if (texture_image) {
        // Upload texture data to the GL
        glBindTexture(GL_TEXTURE_2D, tex);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texture_image->width(), texture_image->height(), 0, GL_BGRA, GL_UNSIGNED_BYTE, texture_image->scanline(0));
    } else {
        dbgln("3DFileViewer: Couldn't load texture for {}", filename);
    }

    m_mesh = new_mesh.release_value();
    dbgln("3DFileViewer: mesh has {} triangles.", m_mesh->triangle_count());

    window()->set_title(DeprecatedString::formatted("{} - 3D File Viewer", filename));

    return true;
}

ErrorOr<int> serenity_main(Main::Arguments arguments)
{
    auto app = TRY(GUI::Application::create(arguments));

    StringView filename;

    Core::ArgsParser args_parser;
    args_parser.add_positional_argument(filename, "3D model file to open", "path", Core::ArgsParser::Required::No);
    args_parser.parse(arguments);

    if (filename.is_empty())
        filename = "/home/anon/Documents/3D Models/teapot.obj"sv;

    TRY(Core::System::pledge("stdio thread recvfd sendfd rpath unix prot_exec map_fixed"));

    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
    TRY(Core::System::unveil("/res", "r"));
    TRY(Core::System::unveil("/usr/lib", "r"));
    TRY(Core::System::unveil(nullptr, nullptr));

    // Construct the main window
    auto window = GUI::Window::construct();
    auto app_icon = GUI::Icon::default_icon("app-3d-file-viewer"sv);
    window->set_icon(app_icon.bitmap_for_size(16));
    window->set_title("3D File Viewer");
    window->resize(640 + 4, 480 + 4);
    window->set_resizable(false);
    window->set_double_buffering_enabled(true);
    auto widget = window->set_main_widget<GLContextWidget>();

    auto& time = widget->add<GUI::Label>();
    time.set_visible(false);
    time.set_foreground_role(ColorRole::HoverHighlight);
    time.set_relative_rect({ 0, 8, 100, 10 });
    time.set_text_alignment(Gfx::TextAlignment::CenterRight);
    time.set_x(widget->width() - time.width() - 6);
    widget->set_stat_label(time);

    auto file_menu = window->add_menu("&File"_string);

    file_menu->add_action(GUI::CommonActions::make_open_action([&](auto&) {
        FileSystemAccessClient::OpenFileOptions options {
            .allowed_file_types = { { GUI::FileTypeFilter { "Object Files", { { "obj" } } }, GUI::FileTypeFilter::all_files() } },
        };
        auto response = FileSystemAccessClient::Client::the().open_file(window, options);
        if (response.is_error())
            return;

        auto file = response.release_value();
        widget->load_file(file.filename(), file.release_stream());
    }));
    file_menu->add_separator();
    file_menu->add_action(GUI::CommonActions::make_quit_action([&](auto&) {
        app->quit();
    }));

    auto view_menu = window->add_menu("&View"_string);
    view_menu->add_action(GUI::CommonActions::make_fullscreen_action([&](auto&) {
        window->set_fullscreen(!window->is_fullscreen());
    }));

    auto rotation_axis_menu = view_menu->add_submenu("Rotation &Axis"_string);
    auto rotation_x_action = GUI::Action::create_checkable("&X", [&widget](auto&) {
        widget->toggle_rotate_x();
    });
    auto rotation_y_action = GUI::Action::create_checkable("&Y", [&widget](auto&) {
        widget->toggle_rotate_y();
    });
    auto rotation_z_action = GUI::Action::create_checkable("&Z", [&widget](auto&) {
        widget->toggle_rotate_z();
    });

    rotation_axis_menu->add_action(*rotation_x_action);
    rotation_axis_menu->add_action(*rotation_y_action);
    rotation_axis_menu->add_action(*rotation_z_action);

    rotation_x_action->set_checked(true);
    rotation_z_action->set_checked(true);

    auto rotation_speed_menu = view_menu->add_submenu("Rotation &Speed"_string);
    GUI::ActionGroup rotation_speed_actions;
    rotation_speed_actions.set_exclusive(true);

    auto no_rotation_action = GUI::Action::create_checkable("N&o Rotation", [&widget](auto&) {
        widget->set_rotation_speed(0.f);
    });
    auto slow_rotation_action = GUI::Action::create_checkable("&Slow", [&widget](auto&) {
        widget->set_rotation_speed(30.f);
    });
    auto normal_rotation_action = GUI::Action::create_checkable("&Normal", [&widget](auto&) {
        widget->set_rotation_speed(60.f);
    });
    auto fast_rotation_action = GUI::Action::create_checkable("&Fast", [&widget](auto&) {
        widget->set_rotation_speed(90.f);
    });

    rotation_speed_actions.add_action(*no_rotation_action);
    rotation_speed_actions.add_action(*slow_rotation_action);
    rotation_speed_actions.add_action(*normal_rotation_action);
    rotation_speed_actions.add_action(*fast_rotation_action);

    rotation_speed_menu->add_action(*no_rotation_action);
    rotation_speed_menu->add_action(*slow_rotation_action);
    rotation_speed_menu->add_action(*normal_rotation_action);
    rotation_speed_menu->add_action(*fast_rotation_action);

    normal_rotation_action->set_checked(true);

    auto show_frame_rate_action = GUI::Action::create_checkable("Show Frame &Rate", [&widget](auto&) {
        widget->toggle_show_frame_rate();
    });

    view_menu->add_action(*show_frame_rate_action);

    auto texture_menu = window->add_menu("&Texture"_string);

    auto texture_enabled_action = GUI::Action::create_checkable("&Enable Texture", [&widget](auto& action) {
        widget->set_texture_enabled(action.is_checked());
    });
    texture_enabled_action->set_checked(true);
    texture_menu->add_action(texture_enabled_action);

    auto wrap_u_menu = texture_menu->add_submenu("Wrap &S"_string);
    GUI::ActionGroup wrap_s_actions;
    wrap_s_actions.set_exclusive(true);

    auto wrap_u_repeat_action = GUI::Action::create_checkable("&Repeat", [&widget](auto&) {
        widget->set_wrap_s_mode(GL_REPEAT);
    });
    auto wrap_u_mirrored_repeat_action = GUI::Action::create_checkable("&Mirrored Repeat", [&widget](auto&) {
        widget->set_wrap_s_mode(GL_MIRRORED_REPEAT);
    });
    auto wrap_u_clamp_action = GUI::Action::create_checkable("&Clamp", [&widget](auto&) {
        widget->set_wrap_s_mode(GL_CLAMP);
    });

    wrap_s_actions.add_action(*wrap_u_repeat_action);
    wrap_s_actions.add_action(*wrap_u_mirrored_repeat_action);
    wrap_s_actions.add_action(*wrap_u_clamp_action);

    wrap_u_menu->add_action(*wrap_u_repeat_action);
    wrap_u_menu->add_action(*wrap_u_mirrored_repeat_action);
    wrap_u_menu->add_action(*wrap_u_clamp_action);

    wrap_u_repeat_action->set_checked(true);

    auto wrap_t_menu = texture_menu->add_submenu("Wrap &T"_string);
    GUI::ActionGroup wrap_t_actions;
    wrap_t_actions.set_exclusive(true);

    auto wrap_t_repeat_action = GUI::Action::create_checkable("&Repeat", [&widget](auto&) {
        widget->set_wrap_t_mode(GL_REPEAT);
    });
    auto wrap_t_mirrored_repeat_action = GUI::Action::create_checkable("&Mirrored Repeat", [&widget](auto&) {
        widget->set_wrap_t_mode(GL_MIRRORED_REPEAT);
    });
    auto wrap_t_clamp_action = GUI::Action::create_checkable("&Clamp", [&widget](auto&) {
        widget->set_wrap_t_mode(GL_CLAMP);
    });

    wrap_t_actions.add_action(*wrap_t_repeat_action);
    wrap_t_actions.add_action(*wrap_t_mirrored_repeat_action);
    wrap_t_actions.add_action(*wrap_t_clamp_action);

    wrap_t_menu->add_action(*wrap_t_repeat_action);
    wrap_t_menu->add_action(*wrap_t_mirrored_repeat_action);
    wrap_t_menu->add_action(*wrap_t_clamp_action);

    wrap_t_repeat_action->set_checked(true);

    auto texture_scale_menu = texture_menu->add_submenu("S&cale"_string);
    GUI::ActionGroup texture_scale_actions;
    texture_scale_actions.set_exclusive(true);

    auto texture_scale_025_action = GUI::Action::create_checkable("0.25x", [&widget](auto&) {
        widget->set_texture_scale(0.25f);
    });

    auto texture_scale_05_action = GUI::Action::create_checkable("0.5x", [&widget](auto&) {
        widget->set_texture_scale(0.5f);
    });

    auto texture_scale_1_action = GUI::Action::create_checkable("1x", [&widget](auto&) {
        widget->set_texture_scale(1);
    });

    auto texture_scale_2_action = GUI::Action::create_checkable("2x", [&widget](auto&) {
        widget->set_texture_scale(2);
    });

    auto texture_scale_4_action = GUI::Action::create_checkable("4x", [&widget](auto&) {
        widget->set_texture_scale(4);
    });

    texture_scale_actions.add_action(*texture_scale_025_action);
    texture_scale_actions.add_action(*texture_scale_05_action);
    texture_scale_actions.add_action(*texture_scale_1_action);
    texture_scale_actions.add_action(*texture_scale_2_action);
    texture_scale_actions.add_action(*texture_scale_4_action);

    texture_scale_menu->add_action(*texture_scale_025_action);
    texture_scale_menu->add_action(*texture_scale_05_action);
    texture_scale_menu->add_action(*texture_scale_1_action);
    texture_scale_menu->add_action(*texture_scale_2_action);
    texture_scale_menu->add_action(*texture_scale_4_action);

    texture_scale_1_action->set_checked(true);

    auto texture_mag_filter_menu = texture_menu->add_submenu("Mag Filter"_string);
    GUI::ActionGroup texture_mag_filter_actions;
    texture_mag_filter_actions.set_exclusive(true);

    auto texture_mag_filter_nearest_action = GUI::Action::create_checkable("&Nearest", [&widget](auto&) {
        widget->set_mag_filter(GL_NEAREST);
    });

    auto texture_mag_filter_linear_action = GUI::Action::create_checkable("&Linear", [&widget](auto&) {
        widget->set_mag_filter(GL_LINEAR);
    });

    texture_mag_filter_actions.add_action(*texture_mag_filter_nearest_action);
    texture_mag_filter_actions.add_action(*texture_mag_filter_linear_action);

    texture_mag_filter_menu->add_action(*texture_mag_filter_nearest_action);
    texture_mag_filter_menu->add_action(*texture_mag_filter_linear_action);

    texture_mag_filter_nearest_action->set_checked(true);

    auto help_menu = window->add_menu("&Help"_string);
    help_menu->add_action(GUI::CommonActions::make_command_palette_action(window));
    help_menu->add_action(GUI::CommonActions::make_about_action("3D File Viewer"_string, app_icon, window));

    window->show();

    auto file = FileSystemAccessClient::Client::the().request_file_read_only_approved(window, filename);
    if (file.is_error()) {
        if (file.error().code() != ENOENT)
            GUI::MessageBox::show(window, DeprecatedString::formatted("Opening \"{}\" failed: {}", filename, strerror(errno)), "Error"sv, GUI::MessageBox::Type::Error);
        return 1;
    }
    widget->load_file(file.value().filename(), file.value().release_stream());

    return app->exec();
}