diff --git a/src/qt/CMakeLists.txt b/src/qt/CMakeLists.txt
index 65ae7c643..65a4a0cbf 100644
--- a/src/qt/CMakeLists.txt
+++ b/src/qt/CMakeLists.txt
@@ -4,14 +4,12 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTORCC ON)
 
-find_package(PkgConfig)
 find_package(Threads REQUIRED)
 
 add_library(plat STATIC qt.c qt_main.cpp qt_platform.cpp cpp11_thread.cpp)
 add_library(ui STATIC
     qt_ui.cpp
     qt_cdrom.c
-    qt_sdl.c
 
     qt_mainwindow.cpp
     qt_mainwindow.hpp
@@ -23,6 +21,8 @@ add_library(ui STATIC
     qt_rendererstack.cpp
     qt_rendererstack.hpp
     qt_rendererstack.ui
+    qt_renderercomon.cpp
+    qt_renderercomon.hpp
     qt_softwarerenderer.cpp
     qt_softwarerenderer.hpp
     qt_hardwarerenderer.cpp
@@ -114,20 +114,6 @@ else()
     qt_import_plugins(plat INCLUDE Qt5::QICOPlugin)
 endif()
 
-if (PkgConfig_FOUND)
-    pkg_check_modules(RTMIDI rtmidi)
-    if (RTMIDI_FOUND)
-        target_include_directories(plat PRIVATE ${RTMIDI_INCLUDE_DIRS})
-        target_link_directories(plat INTERFACE ${RTMIDI_LIBRARY_DIRS})
-        target_link_libraries(plat PRIVATE ${RTMIDI_LIBRARIES})
-        target_sources(plat PRIVATE rtmidi_midi.cpp)
-    else()
-        target_sources(plat PRIVATE qt_midi.cpp)
-    endif()
-else()
-    target_sources(plat PRIVATE qt_midi.cpp)
-endif()
-
 if (UNIX AND NOT APPLE)
     find_package(X11 REQUIRED)
     target_link_libraries(ui PRIVATE X11::X11)
diff --git a/src/qt/qt.c b/src/qt/qt.c
index 2ebab6f69..5aca045dc 100644
--- a/src/qt/qt.c
+++ b/src/qt/qt.c
@@ -3,6 +3,7 @@
  * implemented in Qt
  */
 
+#include <strings.h>
 #include <stdint.h>
 #include <wchar.h>
 
@@ -12,8 +13,6 @@
 #include <86box/timer.h>
 #include <86box/nvr.h>
 
-#include "qt_sdl.h"
-
 int qt_nvr_save(void) {
     return nvr_save();
 }
@@ -62,9 +61,36 @@ wchar_t* plat_get_string(int i)
 
 int
 plat_vidapi(char* api) {
+    if (!strcasecmp(api, "default") || !strcasecmp(api, "system")) {
+        return 0;
+    } else if (!strcasecmp(api, "qt_software")) {
+        return 0;
+    } else if (!strcasecmp(api, "qt_opengl")) {
+        return 1;
+    } else if (!strcasecmp(api, "qt_opengles")) {
+        return 2;
+    }
+
     return 0;
 }
 
 char* plat_vidapi_name(int api) {
-    return "default";
+    char* name = "default";
+
+    switch (api) {
+    case 0:
+        name = "qt_software";
+        break;
+    case 1:
+        name = "qt_opengl";
+        break;
+    case 2:
+        name = "qt_opengles";
+        break;
+    default:
+        fatal("Unknown renderer: %i\n", api);
+        break;
+    }
+
+    return name;
 }
diff --git a/src/qt/qt_hardwarerenderer.cpp b/src/qt/qt_hardwarerenderer.cpp
index d9a206238..0659e41a5 100644
--- a/src/qt/qt_hardwarerenderer.cpp
+++ b/src/qt/qt_hardwarerenderer.cpp
@@ -1,4 +1,5 @@
 #include "qt_hardwarerenderer.hpp"
+#include <QApplication>
 
 extern "C" {
 #include <86box/86box.h>
@@ -14,14 +15,8 @@ void HardwareRenderer::initializeGL()
     initializeOpenGLFunctions();
 }
 
-void HardwareRenderer::paintGL()
-{
-    QPainter painter(this);
-    painter.setRenderHint(QPainter::SmoothPixmapTransform, video_filter_method > 0 ? true : false);
-    painter.drawImage(QRect(0, 0, width(), height()), image, QRect(sx, sy, sw, sh));
-    // "release" image, reducing it's refcount, so renderstack::blit()
-    // won't have to reallocate
-    image = QImage();
+void HardwareRenderer::paintGL() {
+    onPaint(this);
 }
 
 void HardwareRenderer::setRenderType(RenderType type) {
@@ -32,7 +27,7 @@ void HardwareRenderer::setRenderType(RenderType type) {
         format.setRenderableType(QSurfaceFormat::OpenGL);
         break;
     case RenderType::OpenGLES:
-        setTextureFormat(GL_RGBA);
+        setTextureFormat((QApplication::platformName().contains("wayland") || QApplication::platformName() == "cocoa") ? GL_RGB : GL_RGBA);
         format.setRenderableType(QSurfaceFormat::OpenGLES);
         break;
     }
@@ -41,9 +36,11 @@ void HardwareRenderer::setRenderType(RenderType type) {
 
 void HardwareRenderer::onBlit(const QImage& img, int x, int y, int w, int h) {
     image = img;
-    sx = x;
-    sy = y;
-    sw = w;
-    sh = h;
+    source.setRect(x, y, w, h);
     update();
 }
+
+void HardwareRenderer::resizeEvent(QResizeEvent *event) {
+    onResize(width(), height());
+    QOpenGLWidget::resizeEvent(event);
+}
diff --git a/src/qt/qt_hardwarerenderer.hpp b/src/qt/qt_hardwarerenderer.hpp
index 4d7f68a08..3a47c6284 100644
--- a/src/qt/qt_hardwarerenderer.hpp
+++ b/src/qt/qt_hardwarerenderer.hpp
@@ -10,11 +10,13 @@
 #include <mutex>
 #include <QApplication>
 
+#include "qt_renderercomon.hpp"
+
 #ifdef WAYLAND
 #include "wl_mouse.hpp"
 #endif
 
-class HardwareRenderer : public QOpenGLWidget, protected QOpenGLFunctions
+class HardwareRenderer : public QOpenGLWidget, protected QOpenGLFunctions, public RendererCommon
 {
 	Q_OBJECT
 
@@ -49,7 +51,6 @@ public:
 public slots:
     void onBlit(const QImage& img, int, int, int, int);
 
-private:
-    QImage image;
-    int sx, sy, sw, sh;
+protected:
+    void resizeEvent(QResizeEvent *event) override;
 };
diff --git a/src/qt/qt_main.cpp b/src/qt/qt_main.cpp
index 48ca388ac..431da1fd6 100644
--- a/src/qt/qt_main.cpp
+++ b/src/qt/qt_main.cpp
@@ -21,12 +21,7 @@ Q_IMPORT_PLUGIN(QWindowsVistaStylePlugin)
 
 #include <thread>
 
-#define SDL_MAIN_HANDLED
-#include "SDL.h"
-#include "SDL_mutex.h"
-#include "SDL_timer.h"
 #include "qt_mainwindow.hpp"
-#include "qt_sdl.h"
 #include "cocoa_mouse.hpp"
 
 
@@ -88,12 +83,6 @@ main_thread_fn()
     is_quit = 1;
 }
 
-uint32_t timer_onesec(uint32_t interval, void* param)
-{
-    pc_onesec();
-    return interval;
-}
-
 int main(int argc, char* argv[]) {
     QApplication app(argc, argv);
 #ifdef __APPLE__
@@ -101,7 +90,12 @@ int main(int argc, char* argv[]) {
     app.installNativeEventFilter(&cocoafilter);
 #endif
     elapsed_timer.start();
-    SDL_Init(SDL_INIT_TIMER);
+
+    pc_init(argc, argv);
+    if (! pc_init_modules()) {
+        ui_msgbox_header(MBX_FATAL, VC(L"No ROMs found."), VC(L"86Box could not find any usable ROM images.\n\nPlease download a ROM set and extract it into the \"roms\" directory."));
+        return 6;
+    }
 
     main_window = new MainWindow();
     main_window->show();
@@ -114,16 +108,15 @@ int main(int argc, char* argv[]) {
     }
     main_window->setFocusPolicy(Qt::StrongFocus);
 
-    pc_init(argc, argv);
-    if (! pc_init_modules()) {
-        ui_msgbox_header(MBX_FATAL, VC(L"No ROMs found."), VC(L"86Box could not find any usable ROM images.\n\nPlease download a ROM set and extract it into the \"roms\" directory."));
-        return 6;
-    }
     pc_reset_hard_init();
 
     /* Set the PAUSE mode depending on the renderer. */
     // plat_pause(0);
-    SDL_AddTimer(1000, timer_onesec, nullptr);
+    QTimer onesec;
+    QObject::connect(&onesec, &QTimer::timeout, &app, [] {
+        pc_onesec();
+    });
+    onesec.start(1000);
 
     /* Initialize the rendering window, or fullscreen. */
     QTimer::singleShot(50, []() { plat_resize(640, 480); } );
diff --git a/src/qt/qt_mainwindow.cpp b/src/qt/qt_mainwindow.cpp
index 93d5bf1d1..54c29645b 100644
--- a/src/qt/qt_mainwindow.cpp
+++ b/src/qt/qt_mainwindow.cpp
@@ -7,8 +7,6 @@ extern "C" {
 #include <86box/keyboard.h>
 #include <86box/plat.h>
 #include <86box/video.h>
-
-#include "qt_sdl.h"
 };
 
 #include <QGuiApplication>
@@ -79,8 +77,13 @@ MainWindow::MainWindow(QWidget *parent) :
 
     connect(this, &MainWindow::resizeContents, this, [this](int w, int h) {
         if (!QApplication::platformName().contains("eglfs")) {
+            int modifiedHeight = h + menuBar()->height() + statusBar()->height();
             ui->stackedWidget->resize(w, h);
-            resize(w, h + menuBar()->height() + statusBar()->height());
+            if (vid_resize == 0) {
+                setFixedSize(w, modifiedHeight);
+            } else {
+                resize(w, modifiedHeight);
+            }
         }
     });
 
@@ -98,6 +101,86 @@ MainWindow::MainWindow(QWidget *parent) :
 
     ui->actionKeyboard_requires_capture->setChecked(kbd_req_capture);
     ui->actionRight_CTRL_is_left_ALT->setChecked(rctrl_is_lalt);
+    ui->actionResizable_window->setChecked(vid_resize > 0);
+    ui->menuWindow_scale_factor->setEnabled(vid_resize == 0);
+    switch (vid_api) {
+    case 0:
+        ui->stackedWidget->setCurrentIndex(0);
+        ui->actionSoftware_Renderer->setChecked(true);
+        break;
+    case 1:
+        ui->stackedWidget->setCurrentIndex(1);
+        ui->actionHardware_Renderer_OpenGL->setChecked(true);
+        break;
+    case 2:
+        ui->stackedWidget->setCurrentIndex(2);
+        ui->actionHardware_Renderer_OpenGL_ES->setChecked(true);
+        break;
+    }
+    switch (scale) {
+    case 0:
+        ui->action0_5x->setChecked(true);
+        break;
+    case 1:
+        ui->action1x->setChecked(true);
+        break;
+    case 2:
+        ui->action1_5x->setChecked(true);
+        break;
+    case 3:
+        ui->action2x->setChecked(true);
+        break;
+    }
+    switch (video_filter_method) {
+    case 0:
+        ui->actionNearest->setChecked(true);
+        break;
+    case 1:
+        ui->actionLinear->setChecked(true);
+        break;
+    }
+    switch (video_fullscreen_scale) {
+    case FULLSCR_SCALE_FULL:
+        ui->actionFullScreen_stretch->setChecked(true);
+        break;
+    case FULLSCR_SCALE_43:
+        ui->actionFullScreen_43->setChecked(true);
+        break;
+    case FULLSCR_SCALE_KEEPRATIO:
+        ui->actionFullScreen_keepRatio->setChecked(true);
+        break;
+    case FULLSCR_SCALE_INT:
+        ui->actionFullScreen_int->setChecked(true);
+        break;
+    }
+    switch (video_grayscale) {
+    case 0:
+        ui->actionRGB_Color->setChecked(true);
+        break;
+    case 1:
+        ui->actionRGB_Grayscale->setChecked(true);
+        break;
+    case 2:
+        ui->actionAmber_monitor->setChecked(true);
+        break;
+    case 3:
+        ui->actionGreen_monitor->setChecked(true);
+        break;
+    case 4:
+        ui->actionWhite_monitor->setChecked(true);
+        break;
+    }
+    switch (video_graytype) {
+    case 0:
+        ui->actionBT601_NTSC_PAL->setChecked(true);
+        break;
+    case 1:
+        ui->actionBT709_HDTV->setChecked(true);
+        break;
+    case 2:
+        ui->actionAverage->setChecked(true);
+        break;
+    }
 
     setFocusPolicy(Qt::StrongFocus);
     ui->gles->setFocusPolicy(Qt::NoFocus);
@@ -696,6 +779,10 @@ void MainWindow::on_actionFullscreen_triggered() {
         showFullScreen();
         video_fullscreen = 1;
     }
+
+    auto widget = ui->stackedWidget->currentWidget();
+    auto rc = dynamic_cast<RendererCommon*>(widget);
+    rc->onResize(widget->width(), widget->height());
 }
 
 void MainWindow::setTitle_(const wchar_t *title)
@@ -740,6 +827,7 @@ bool MainWindow::eventFilter(QObject* receiver, QEvent* event)
             return true;
         }
     }
+
     return QMainWindow::eventFilter(receiver, event);
 }
 
@@ -794,14 +882,23 @@ void MainWindow::keyReleaseEvent(QKeyEvent* event)
 
 void MainWindow::on_actionSoftware_Renderer_triggered() {
     ui->stackedWidget->setCurrentIndex(0);
+    ui->actionHardware_Renderer_OpenGL->setChecked(false);
+    ui->actionHardware_Renderer_OpenGL_ES->setChecked(false);
+    vid_api = 0;
 }
 
 void MainWindow::on_actionHardware_Renderer_OpenGL_triggered() {
     ui->stackedWidget->setCurrentIndex(1);
+    ui->actionSoftware_Renderer->setChecked(false);
+    ui->actionHardware_Renderer_OpenGL_ES->setChecked(false);
+    vid_api = 1;
 }
 
 void MainWindow::on_actionHardware_Renderer_OpenGL_ES_triggered() {
     ui->stackedWidget->setCurrentIndex(2);
+    ui->actionSoftware_Renderer->setChecked(false);
+    ui->actionHardware_Renderer_OpenGL->setChecked(false);
+    vid_api = 2;
 }
 
 void MainWindow::focusInEvent(QFocusEvent* event)
@@ -813,3 +910,166 @@ void MainWindow::focusOutEvent(QFocusEvent* event)
 {
     this->releaseKeyboard();
 }
+
+void MainWindow::on_actionResizable_window_triggered(bool checked) {
+    if (checked) {
+        vid_resize = 1;
+        setFixedSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
+    } else {
+        vid_resize = 0;
+    }
+    ui->menuWindow_scale_factor->setEnabled(! checked);
+    emit resizeContents(scrnsz_x, scrnsz_y);
+}
+
+static void
+video_toggle_option(QAction* action, int *val)
+{
+    startblit();
+    *val ^= 1;
+    video_copy = (video_grayscale || invert_display) ? video_transform_copy : memcpy;
+    action->setChecked(*val > 0 ? true : false);
+    endblit();
+    config_save();
+    device_force_redraw();
+}
+
+void MainWindow::on_actionInverted_VGA_monitor_triggered() {
+    video_toggle_option(ui->actionInverted_VGA_monitor, &invert_display);
+}
+
+static void update_scaled_checkboxes(Ui::MainWindow* ui, QAction* selected) {
+    ui->action0_5x->setChecked(ui->action0_5x == selected);
+    ui->action1x->setChecked(ui->action1x == selected);
+    ui->action1_5x->setChecked(ui->action1_5x == selected);
+    ui->action2x->setChecked(ui->action2x == selected);
+
+    reset_screen_size();
+    device_force_redraw();
+    video_force_resize_set(1);
+    doresize = 1;
+    config_save();
+}
+
+void MainWindow::on_action0_5x_triggered() {
+    scale = 0;
+    update_scaled_checkboxes(ui, ui->action0_5x);
+}
+
+void MainWindow::on_action1x_triggered() {
+    scale = 1;
+    update_scaled_checkboxes(ui, ui->action1x);
+}
+
+void MainWindow::on_action1_5x_triggered() {
+    scale = 2;
+    update_scaled_checkboxes(ui, ui->action1_5x);
+}
+
+void MainWindow::on_action2x_triggered() {
+    scale = 3;
+    update_scaled_checkboxes(ui, ui->action2x);
+}
+
+void MainWindow::on_actionNearest_triggered() {
+    video_filter_method = 0;
+    ui->actionLinear->setChecked(false);
+}
+
+void MainWindow::on_actionLinear_triggered() {
+    video_filter_method = 1;
+    ui->actionNearest->setChecked(false);
+}
+
+static void update_fullscreen_scale_checkboxes(Ui::MainWindow* ui, QAction* selected) {
+    ui->actionFullScreen_stretch->setChecked(ui->actionFullScreen_stretch == selected);
+    ui->actionFullScreen_43->setChecked(ui->actionFullScreen_43 == selected);
+    ui->actionFullScreen_keepRatio->setChecked(ui->actionFullScreen_keepRatio == selected);
+    ui->actionFullScreen_int->setChecked(ui->actionFullScreen_int == selected);
+
+    if (video_fullscreen > 0) {
+        auto widget = ui->stackedWidget->currentWidget();
+        auto rc = dynamic_cast<RendererCommon*>(widget);
+        rc->onResize(widget->width(), widget->height());
+    }
+
+    device_force_redraw();
+    config_save();
+}
+
+void MainWindow::on_actionFullScreen_stretch_triggered() {
+    video_fullscreen_scale = FULLSCR_SCALE_FULL;
+    update_fullscreen_scale_checkboxes(ui, ui->actionFullScreen_stretch);
+}
+
+void MainWindow::on_actionFullScreen_43_triggered() {
+    video_fullscreen_scale = FULLSCR_SCALE_43;
+    update_fullscreen_scale_checkboxes(ui, ui->actionFullScreen_43);
+}
+
+void MainWindow::on_actionFullScreen_keepRatio_triggered() {
+    video_fullscreen_scale = FULLSCR_SCALE_KEEPRATIO;
+    update_fullscreen_scale_checkboxes(ui, ui->actionFullScreen_keepRatio);
+}
+
+void MainWindow::on_actionFullScreen_int_triggered() {
+    video_fullscreen_scale = FULLSCR_SCALE_INT;
+    update_fullscreen_scale_checkboxes(ui, ui->actionFullScreen_int);
+}
+
+static void update_greyscale_checkboxes(Ui::MainWindow* ui, QAction* selected, int value) {
+    ui->actionRGB_Color->setChecked(ui->actionRGB_Color == selected);
+    ui->actionRGB_Grayscale->setChecked(ui->actionRGB_Grayscale == selected);
+    ui->actionAmber_monitor->setChecked(ui->actionAmber_monitor == selected);
+    ui->actionGreen_monitor->setChecked(ui->actionGreen_monitor == selected);
+    ui->actionWhite_monitor->setChecked(ui->actionWhite_monitor == selected);
+
+    startblit();
+    video_grayscale = value;
+    video_copy = (video_grayscale || invert_display) ? video_transform_copy : memcpy;
+    endblit();
+    device_force_redraw();
+    config_save();
+}
+
+void MainWindow::on_actionRGB_Color_triggered() {
+    update_greyscale_checkboxes(ui, ui->actionRGB_Color, 0);
+}
+
+void MainWindow::on_actionRGB_Grayscale_triggered() {
+    update_greyscale_checkboxes(ui, ui->actionRGB_Grayscale, 1);
+}
+
+void MainWindow::on_actionAmber_monitor_triggered() {
+    update_greyscale_checkboxes(ui, ui->actionAmber_monitor, 2);
+}
+
+void MainWindow::on_actionGreen_monitor_triggered() {
+    update_greyscale_checkboxes(ui, ui->actionGreen_monitor, 3);
+}
+
+void MainWindow::on_actionWhite_monitor_triggered() {
+    update_greyscale_checkboxes(ui, ui->actionWhite_monitor, 4);
+}
+
+static void update_greyscale_type_checkboxes(Ui::MainWindow* ui, QAction* selected, int value) {
+    ui->actionBT601_NTSC_PAL->setChecked(ui->actionBT601_NTSC_PAL == selected);
+    ui->actionBT709_HDTV->setChecked(ui->actionBT709_HDTV == selected);
+    ui->actionAverage->setChecked(ui->actionAverage == selected);
+
+    video_graytype = value;
+    device_force_redraw();
+    config_save();
+}
+
+void MainWindow::on_actionBT601_NTSC_PAL_triggered() {
+    update_greyscale_type_checkboxes(ui, ui->actionBT601_NTSC_PAL, 0);
+}
+
+void MainWindow::on_actionBT709_HDTV_triggered() {
+    update_greyscale_type_checkboxes(ui, ui->actionBT709_HDTV, 1);
+}
+
+void MainWindow::on_actionAverage_triggered() {
+    update_greyscale_type_checkboxes(ui, ui->actionAverage, 2);
+}
diff --git a/src/qt/qt_mainwindow.hpp b/src/qt/qt_mainwindow.hpp
index 6c56cfd6a..972b2a161 100644
--- a/src/qt/qt_mainwindow.hpp
+++ b/src/qt/qt_mainwindow.hpp
@@ -56,6 +56,26 @@ private slots:
     void on_actionHardware_Renderer_OpenGL_ES_triggered();
     void on_actionHardware_Renderer_OpenGL_triggered();
     void on_actionSoftware_Renderer_triggered();
+    void on_actionResizable_window_triggered(bool checked);
+    void on_actionInverted_VGA_monitor_triggered();
+    void on_action0_5x_triggered();
+    void on_action1x_triggered();
+    void on_action1_5x_triggered();
+    void on_action2x_triggered();
+    void on_actionLinear_triggered();
+    void on_actionNearest_triggered();
+    void on_actionFullScreen_int_triggered();
+    void on_actionFullScreen_keepRatio_triggered();
+    void on_actionFullScreen_43_triggered();
+    void on_actionFullScreen_stretch_triggered();
+    void on_actionWhite_monitor_triggered();
+    void on_actionGreen_monitor_triggered();
+    void on_actionAmber_monitor_triggered();
+    void on_actionRGB_Grayscale_triggered();
+    void on_actionRGB_Color_triggered();
+    void on_actionAverage_triggered();
+    void on_actionBT709_HDTV_triggered();
+    void on_actionBT601_NTSC_PAL_triggered();
 
     void refreshMediaMenu();
     void showMessage_(const QString& header, const QString& message);
diff --git a/src/qt/qt_mainwindow.ui b/src/qt/qt_mainwindow.ui
index 3541a5736..af8a8a2bd 100644
--- a/src/qt/qt_mainwindow.ui
+++ b/src/qt/qt_mainwindow.ui
@@ -54,7 +54,7 @@
      <x>0</x>
      <y>0</y>
      <width>724</width>
-     <height>20</height>
+     <height>19</height>
     </rect>
    </property>
    <widget class="QMenu" name="menuAction">
@@ -83,10 +83,83 @@
     <property name="title">
      <string>View</string>
     </property>
+    <widget class="QMenu" name="menuRenderer">
+     <property name="title">
+      <string>Renderer</string>
+     </property>
+     <addaction name="actionSoftware_Renderer"/>
+     <addaction name="actionHardware_Renderer_OpenGL"/>
+     <addaction name="actionHardware_Renderer_OpenGL_ES"/>
+    </widget>
+    <widget class="QMenu" name="menuWindow_scale_factor">
+     <property name="title">
+      <string>Window scale factor</string>
+     </property>
+     <addaction name="action0_5x"/>
+     <addaction name="action1x"/>
+     <addaction name="action1_5x"/>
+     <addaction name="action2x"/>
+    </widget>
+    <widget class="QMenu" name="menuFilter_method">
+     <property name="title">
+      <string>Filter method</string>
+     </property>
+     <addaction name="actionNearest"/>
+     <addaction name="actionLinear"/>
+    </widget>
+    <widget class="QMenu" name="menuFullscreen_stretch_mode">
+     <property name="title">
+      <string>Fullscreen stretch mode</string>
+     </property>
+     <addaction name="actionFullScreen_stretch"/>
+     <addaction name="actionFullScreen_43"/>
+     <addaction name="actionFullScreen_keepRatio"/>
+     <addaction name="actionFullScreen_int"/>
+    </widget>
+    <widget class="QMenu" name="menuEGA_S_VGA_settings">
+     <property name="title">
+      <string>EGA/(S)VGA settings</string>
+     </property>
+     <widget class="QMenu" name="menuVGA_screen_type">
+      <property name="title">
+       <string>VGA screen type</string>
+      </property>
+      <addaction name="actionRGB_Color"/>
+      <addaction name="actionRGB_Grayscale"/>
+      <addaction name="actionAmber_monitor"/>
+      <addaction name="actionGreen_monitor"/>
+      <addaction name="actionWhite_monitor"/>
+     </widget>
+     <widget class="QMenu" name="menuGrayscale_conversion_type">
+      <property name="title">
+       <string>Grayscale conversion type</string>
+      </property>
+      <addaction name="actionBT601_NTSC_PAL"/>
+      <addaction name="actionBT709_HDTV"/>
+      <addaction name="actionAverage"/>
+     </widget>
+     <addaction name="actionInverted_VGA_monitor"/>
+     <addaction name="menuVGA_screen_type"/>
+     <addaction name="menuGrayscale_conversion_type"/>
+    </widget>
+    <addaction name="actionHide_status_bar"/>
+    <addaction name="separator"/>
+    <addaction name="actionResizable_window"/>
+    <addaction name="actionRemember_size_and_position"/>
+    <addaction name="separator"/>
+    <addaction name="menuRenderer"/>
+    <addaction name="actionSpecify_dimensions"/>
+    <addaction name="actionForce_4_3_display_ratio"/>
+    <addaction name="menuWindow_scale_factor"/>
+    <addaction name="menuFilter_method"/>
+    <addaction name="actionHiDPI_scaling"/>
+    <addaction name="separator"/>
     <addaction name="actionFullscreen"/>
-    <addaction name="actionSoftware_Renderer"/>
-    <addaction name="actionHardware_Renderer_OpenGL"/>
-    <addaction name="actionHardware_Renderer_OpenGL_ES"/>
+    <addaction name="menuFullscreen_stretch_mode"/>
+    <addaction name="menuEGA_S_VGA_settings"/>
+    <addaction name="separator"/>
+    <addaction name="actionCGA_PCjr_Tandy_EGA_S_VGA_overscan"/>
+    <addaction name="actionChange_contrast_for_monochrome_display"/>
    </widget>
    <widget class="QMenu" name="menuMedia">
     <property name="title">
@@ -157,20 +230,242 @@
    </property>
   </action>
   <action name="actionSoftware_Renderer">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
    <property name="text">
     <string>Software Renderer</string>
    </property>
   </action>
   <action name="actionHardware_Renderer_OpenGL">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
    <property name="text">
     <string>Hardware Renderer (OpenGL)</string>
    </property>
   </action>
   <action name="actionHardware_Renderer_OpenGL_ES">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
    <property name="text">
     <string>Hardware Renderer (OpenGL ES)</string>
    </property>
   </action>
+  <action name="actionHide_status_bar">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Hide status bar</string>
+   </property>
+  </action>
+  <action name="actionResizable_window">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Resizable window</string>
+   </property>
+  </action>
+  <action name="actionRemember_size_and_position">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Remember size and position</string>
+   </property>
+  </action>
+  <action name="actionSpecify_dimensions">
+   <property name="text">
+    <string>Specify dimensions...</string>
+   </property>
+  </action>
+  <action name="actionForce_4_3_display_ratio">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Force 4:3 display ratio</string>
+   </property>
+  </action>
+  <action name="actionHiDPI_scaling">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>HiDPI scaling</string>
+   </property>
+  </action>
+  <action name="actionCGA_PCjr_Tandy_EGA_S_VGA_overscan">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>CGA/PCjr/Tandy/EGA/(S)VGA overscan</string>
+   </property>
+  </action>
+  <action name="actionChange_contrast_for_monochrome_display">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Change contrast for monochrome display</string>
+   </property>
+  </action>
+  <action name="action0_5x">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>0.5x</string>
+   </property>
+  </action>
+  <action name="action1x">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>1x</string>
+   </property>
+  </action>
+  <action name="action1_5x">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>1.5x</string>
+   </property>
+  </action>
+  <action name="action2x">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>2x</string>
+   </property>
+  </action>
+  <action name="actionNearest">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Nearest</string>
+   </property>
+  </action>
+  <action name="actionLinear">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Linear</string>
+   </property>
+  </action>
+  <action name="actionFullScreen_stretch">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Full screen stretch</string>
+   </property>
+  </action>
+  <action name="actionFullScreen_43">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>4:3</string>
+   </property>
+  </action>
+  <action name="actionFullScreen_keepRatio">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Square pixels (Keep ratio)</string>
+   </property>
+  </action>
+  <action name="actionFullScreen_int">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Integer scale</string>
+   </property>
+  </action>
+  <action name="actionInverted_VGA_monitor">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Inverted VGA monitor</string>
+   </property>
+  </action>
+  <action name="actionRGB_Color">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>RGB Color</string>
+   </property>
+  </action>
+  <action name="actionRGB_Grayscale">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>RGB Grayscale</string>
+   </property>
+  </action>
+  <action name="actionAmber_monitor">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Amber monitor</string>
+   </property>
+  </action>
+  <action name="actionGreen_monitor">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Green monitor</string>
+   </property>
+  </action>
+  <action name="actionWhite_monitor">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>White monitor</string>
+   </property>
+  </action>
+  <action name="actionBT601_NTSC_PAL">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>BT601 (NTSC/PAL)</string>
+   </property>
+  </action>
+  <action name="actionBT709_HDTV">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>BT709 (HDTV)</string>
+   </property>
+  </action>
+  <action name="actionAverage">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Average</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>
diff --git a/src/qt/qt_platform.cpp b/src/qt/qt_platform.cpp
index 357d9e0c3..0f83a8583 100644
--- a/src/qt/qt_platform.cpp
+++ b/src/qt/qt_platform.cpp
@@ -1,6 +1,7 @@
 #include <cstdio>
 
 #include <mutex>
+#include <thread>
 #include <memory>
 #include <algorithm>
 
@@ -21,6 +22,8 @@
 // static QByteArray buf;
 extern QElapsedTimer elapsed_timer;
 QElapsedTimer elapsed_timer;
+
+static std::atomic_int blitmx_contention = 0;
 static std::mutex blitmx;
 
 class CharPointer {
@@ -408,12 +411,24 @@ void joystick_close(void) {}
 void joystick_process(void) {}
 void startblit()
 {
+    blitmx_contention++;
+    if (blitmx.try_lock()) {
+        return;
+    }
+
     blitmx.lock();
 }
 
 void endblit()
 {
+    blitmx_contention--;
     blitmx.unlock();
+    if (blitmx_contention > 0) {
+        // a deadlock has been observed on linux when toggling via video_toggle_option
+        // because the mutex is typically unfair on linux
+        // => sleep if there's contention
+        std::this_thread::sleep_for(std::chrono::milliseconds(1));
+    }
 }
 
 }
diff --git a/src/qt/qt_renderercomon.cpp b/src/qt/qt_renderercomon.cpp
new file mode 100644
index 000000000..173ae1abe
--- /dev/null
+++ b/src/qt/qt_renderercomon.cpp
@@ -0,0 +1,89 @@
+#include "qt_renderercomon.hpp"
+
+#include <QPainter>
+#include <QWidget>
+
+#include <cmath>
+
+extern "C" {
+#include <86box/86box.h>
+#include <86box/video.h>
+}
+
+RendererCommon::RendererCommon() = default;
+
+void RendererCommon::onPaint(QPaintDevice* device) {
+    QPainter painter(device);
+    painter.setRenderHint(QPainter::SmoothPixmapTransform, video_filter_method > 0 ? true : false);
+    painter.drawImage(destination, image, source);
+    // "release" image, reducing it's refcount, so renderstack::blit()
+    // won't have to reallocate
+    image = QImage();
+}
+
+static void integer_scale(double *d, double *g) {
+    double ratio;
+
+    if (*d > *g) {
+        ratio = std::floor(*d / *g);
+        *d = *g * ratio;
+    } else {
+        ratio = std::ceil(*d / *g);
+        *d = *g / ratio;
+    }
+}
+
+void RendererCommon::onResize(int width, int height) {
+    if (video_fullscreen == 0) {
+        destination.setRect(0, 0, width, height);
+        return;
+    }
+    double dx, dy, dw, dh, gsr;
+
+    double hw = width;
+    double hh = height;
+    double gw = source.width();
+    double gh = source.height();
+    double hsr = hw / hh;
+
+    switch (video_fullscreen_scale) {
+    case FULLSCR_SCALE_INT:
+        gsr = gw / gh;
+        if (gsr <= hsr) {
+            dw = hh * gsr;
+            dh = hh;
+        } else {
+            dw = hw;
+            dh = hw / gsr;
+        }
+        integer_scale(&dw, &gw);
+        integer_scale(&dh, &gh);
+        dx = (hw - dw) / 2.0;
+        dy = (hh - dh) / 2.0;
+        destination.setRect(dx, dy, dw, dh);
+        break;
+    case FULLSCR_SCALE_43:
+    case FULLSCR_SCALE_KEEPRATIO:
+        if (video_fullscreen_scale == FULLSCR_SCALE_43) {
+            gsr = 4.0 / 3.0;
+        } else {
+            gsr = gw / gh;
+        }
+
+        if (gsr <= hsr) {
+            dw = hh * gsr;
+            dh = hh;
+        } else {
+            dw = hw;
+            dh = hw / gsr;
+        }
+        dx = (hw - dw) / 2.0;
+        dy = (hh - dh) / 2.0;
+        destination.setRect(dx, dy, dw, dh);
+        break;
+    case FULLSCR_SCALE_FULL:
+    default:
+        destination.setRect(0, 0, hw, hh);
+        break;
+    }
+}
diff --git a/src/qt/qt_renderercomon.hpp b/src/qt/qt_renderercomon.hpp
new file mode 100644
index 000000000..6eed9c9b2
--- /dev/null
+++ b/src/qt/qt_renderercomon.hpp
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <QRect>
+#include <QImage>
+
+class QWidget;
+
+class RendererCommon
+{
+public:
+    RendererCommon();
+
+    void onResize(int width, int height);
+protected:
+    void onPaint(QPaintDevice* device);
+
+    QImage image;
+    QRect source, destination;
+};
diff --git a/src/qt/qt_rendererstack.cpp b/src/qt/qt_rendererstack.cpp
index cbc0b5e44..bb80944de 100644
--- a/src/qt/qt_rendererstack.cpp
+++ b/src/qt/qt_rendererstack.cpp
@@ -4,6 +4,8 @@
 #include "qt_softwarerenderer.hpp"
 #include "qt_hardwarerenderer.hpp"
 
+#include <QScreen>
+
 #ifdef __APPLE__
 #include <CoreGraphics/CoreGraphics.h>
 #endif
@@ -99,11 +101,11 @@ void RendererStack::wheelEvent(QWheelEvent *event)
 {
     if (mouse_capture)
     {
-        mousedata.deltay += event->pixelDelta().y();
+        mousedata.deltaz += event->pixelDelta().y();
     }
 }
 
-int ignoreNextMouseEvent = 0;
+int ignoreNextMouseEvent = 1;
 void RendererStack::mouseMoveEvent(QMouseEvent *event)
 {
     if (QApplication::platformName().contains("wayland"))
@@ -120,12 +122,25 @@ void RendererStack::mouseMoveEvent(QMouseEvent *event)
     if (ignoreNextMouseEvent) { oldPos = event->pos(); ignoreNextMouseEvent--; event->accept(); return; }
     mousedata.deltax += event->pos().x() - oldPos.x();
     mousedata.deltay += event->pos().y() - oldPos.y();
-    QCursor::setPos(mapToGlobal(QPoint(width() / 2, height() / 2)));
+    if (event->globalPos().x() == 0 || event->globalPos().y() == 0) leaveEvent((QEvent*)event);
+    if (event->globalPos().x() == (screen()->geometry().width() - 1) || event->globalPos().y() == (screen()->geometry().height() - 1)) leaveEvent((QEvent*)event);
     oldPos = event->pos();
-    ignoreNextMouseEvent = 1;
 #endif
 }
 
+void RendererStack::leaveEvent(QEvent* event)
+{
+    if (QApplication::platformName().contains("wayland"))
+    {
+        event->accept();
+        return;
+    }
+    if (!mouse_capture) return;
+    QCursor::setPos(mapToGlobal(QPoint(width() / 2, height() / 2)));
+    ignoreNextMouseEvent = 2;
+    event->accept();
+}
+
 // called from blitter thread
 void RendererStack::blit(int x, int y, int w, int h)
 {
diff --git a/src/qt/qt_rendererstack.hpp b/src/qt/qt_rendererstack.hpp
index 05dd5db5c..239bd5bef 100644
--- a/src/qt/qt_rendererstack.hpp
+++ b/src/qt/qt_rendererstack.hpp
@@ -3,6 +3,7 @@
 
 #include <QStackedWidget>
 #include <QKeyEvent>
+#include <QEvent>
 
 namespace Ui {
 class RendererStack;
@@ -20,6 +21,7 @@ public:
     void mouseReleaseEvent(QMouseEvent* event) override;
     void mouseMoveEvent(QMouseEvent* event) override;
     void wheelEvent(QWheelEvent *event) override;
+    void leaveEvent(QEvent *event) override;
     void keyPressEvent(QKeyEvent* event) override
     {
         event->ignore();
diff --git a/src/qt/qt_softwarerenderer.cpp b/src/qt/qt_softwarerenderer.cpp
index cf69ca2fb..0565d2d6c 100644
--- a/src/qt/qt_softwarerenderer.cpp
+++ b/src/qt/qt_softwarerenderer.cpp
@@ -1,26 +1,19 @@
 #include "qt_softwarerenderer.hpp"
 
-extern "C" {
-#include <86box/86box.h>
-}
-#include <QPainter>
-
 SoftwareRenderer::SoftwareRenderer(QWidget *parent) : QWidget(parent) {}
 
 void SoftwareRenderer::paintEvent(QPaintEvent *event) {
     (void) event;
-
-    QPainter painter(this);
-    painter.setRenderHint(QPainter::SmoothPixmapTransform, video_filter_method > 0 ? true : false);
-    painter.drawImage(QRect(0, 0, width(), height()), image, QRect(sx, sy, sw, sh));
-    image = QImage();
+    onPaint(this);
 }
 
 void SoftwareRenderer::onBlit(const QImage& img, int x, int y, int w, int h) {
     image = img;
-    sx = x;
-    sy = y;
-    sw = w;
-    sh = h;
+    source.setRect(x, y, w, h);
     update();
 }
+
+void SoftwareRenderer::resizeEvent(QResizeEvent *event) {
+    onResize(width(), height());
+    QWidget::resizeEvent(event);
+}
diff --git a/src/qt/qt_softwarerenderer.hpp b/src/qt/qt_softwarerenderer.hpp
index 2a1075023..873e9f732 100644
--- a/src/qt/qt_softwarerenderer.hpp
+++ b/src/qt/qt_softwarerenderer.hpp
@@ -2,21 +2,20 @@
 #define SOFTWARERENDERER_HPP
 
 #include <QWidget>
+#include "qt_renderercomon.hpp"
 
-class SoftwareRenderer : public QWidget
+class SoftwareRenderer : public QWidget, public RendererCommon
 {
     Q_OBJECT
 public:
     explicit SoftwareRenderer(QWidget *parent = nullptr);
 
     void paintEvent(QPaintEvent *event) override;
-
 public slots:
     void onBlit(const QImage& img, int, int, int, int);
 
-private:
-    QImage image;
-    int sx, sy, sw, sh;
+protected:
+    void resizeEvent(QResizeEvent *event) override;
 };
 
 #endif // SOFTWARERENDERER_HPP
diff --git a/src/qt/qt_ui.cpp b/src/qt/qt_ui.cpp
index e69a954c2..41d608216 100644
--- a/src/qt/qt_ui.cpp
+++ b/src/qt/qt_ui.cpp
@@ -2,15 +2,12 @@
 
 #include <QDebug>
 #include <QThread>
+#include <QMessageBox>
 
 #include <QStatusBar>
 
 #include "qt_mainwindow.hpp"
 
-std::atomic_int resize_pending = 0;
-std::atomic_int resize_w = 0;
-std::atomic_int resize_h = 0;
-
 MainWindow* main_window = nullptr;
 
 extern "C" {
@@ -46,10 +43,6 @@ void mouse_poll() {
 }
 
 void plat_resize(int w, int h) {
-    resize_w = w;
-    resize_h = h;
-    resize_pending = 1;
-
     main_window->resizeContents(w, h);
 }
 
@@ -68,7 +61,13 @@ int	ui_msgbox_header(int flags, void *header, void* message) {
     auto hdr = QString::fromWCharArray(reinterpret_cast<const wchar_t*>(header));
     auto msg = QString::fromWCharArray(reinterpret_cast<const wchar_t*>(message));
 
-    main_window->showMessage(hdr, msg);
+    // any error in early init
+    if (main_window == nullptr) {
+        QMessageBox::critical(nullptr, hdr, msg);
+    } else {
+        // else scope it to main_window
+        main_window->showMessage(hdr, msg);
+    }
     return 0;
 }