diff --git a/src/frontend/qt_sdl/Config.cpp b/src/frontend/qt_sdl/Config.cpp
index 0cf6a5bd..c261c7a3 100644
--- a/src/frontend/qt_sdl/Config.cpp
+++ b/src/frontend/qt_sdl/Config.cpp
@@ -37,17 +37,6 @@ namespace Config
 {
 using namespace melonDS;
 
-bool ScreenUseGL;
-bool ScreenVSync;
-int ScreenVSyncInterval;
-
-int _3DRenderer;
-bool Threaded3D;
-
-int GL_ScaleFactor;
-bool GL_BetterPolygons;
-bool GL_HiresCoordinates;
-
 
 const char* kConfigFile = "melonDS.toml";
 
@@ -63,6 +52,7 @@ DefaultList<int> DefaultInts =
     {"Instance*.Window*.Width", 256},
     {"Instance*.Window*.Height", 384},
     {"Screen.VSyncInterval", 1},
+    {"3D.Renderer", renderer3D_Software},
     {"3D.GL.ScaleFactor", 1},
     {"MaxFPS", 1000},
 #ifdef JIT_ENABLED
@@ -86,11 +76,7 @@ DefaultList<int> DefaultInts =
 RangeList IntRanges =
 {
     {"Emu.ConsoleType", {0, 1}},
-#ifdef OGLRENDERER_ENABLED
-    {"3D.Renderer", {0, 1}},
-#else
-    {"3D.Renderer", {0, 0}},
-#endif
+    {"3D.Renderer", {0, renderer3D_Max-1}},
     {"Screen.VSyncInterval", {1, 20}},
     {"3D.GL.ScaleFactor", {1, 16}},
     {"Audio.Interpolation", {0, 3}},
@@ -108,7 +94,8 @@ RangeList IntRanges =
 DefaultList<bool> DefaultBools =
 {
     {"Screen.Filter", true},
-    {"3D.Soft.Threaded3D", true},
+    {"3D.Soft.Threaded", true},
+    {"3D.GL.HiresCoordinates", true},
     {"LimitFPS", true},
     {"Window*.ShowOSD", true},
     {"Emu.DirectBoot", true},
@@ -205,10 +192,11 @@ LegacyEntry LegacyFile[] =
     {"ScreenVSyncInterval", 0, "Screen.VSyncInterval", false},
 
     {"3DRenderer", 0, "3D.Renderer", false},
-    {"Threaded3D", 1, "3D.Soft.Threaded3D", false},
+    {"Threaded3D", 1, "3D.Soft.Threaded", false},
 
     {"GL_ScaleFactor", 0, "3D.GL.ScaleFactor", false},
     {"GL_BetterPolygons", 1, "3D.GL.BetterPolygons", false},
+    {"GL_HiresCoordinates", 1, "3D.GL.HiresCoordinates", false},
 
     {"LimitFPS", 1, "LimitFPS", false},
     {"MaxFPS", 0, "MaxFPS", false},
diff --git a/src/frontend/qt_sdl/Config.h b/src/frontend/qt_sdl/Config.h
index 5f2e16aa..ffe8cc3c 100644
--- a/src/frontend/qt_sdl/Config.h
+++ b/src/frontend/qt_sdl/Config.h
@@ -16,8 +16,8 @@
     with melonDS. If not, see http://www.gnu.org/licenses/.
 */
 
-#ifndef PLATFORMCONFIG_H
-#define PLATFORMCONFIG_H
+#ifndef CONFIG_H
+#define CONFIG_H
 
 #include <variant>
 #include <string>
@@ -131,18 +131,6 @@ private:
 };
 
 
-extern bool ScreenUseGL;
-extern bool ScreenVSync;
-extern int ScreenVSyncInterval;
-
-extern int _3DRenderer;
-extern bool Threaded3D;
-
-extern int GL_ScaleFactor;
-extern bool GL_BetterPolygons;
-extern bool GL_HiresCoordinates;
-
-
 bool Load();
 void Save();
 
@@ -151,4 +139,4 @@ inline Table GetGlobalTable() { return GetLocalTable(-1); }
 
 }
 
-#endif // PLATFORMCONFIG_H
+#endif // CONFIG_H
diff --git a/src/frontend/qt_sdl/EmuInstance.cpp b/src/frontend/qt_sdl/EmuInstance.cpp
index 9ed7f37a..79bfa25c 100644
--- a/src/frontend/qt_sdl/EmuInstance.cpp
+++ b/src/frontend/qt_sdl/EmuInstance.cpp
@@ -156,6 +156,64 @@ void EmuInstance::osdAddMessage(unsigned int color, const char* fmt, ...)
 }
 
 
+bool EmuInstance::usesOpenGL()
+{
+    return globalCfg.GetBool("Screen.UseGL") ||
+           (globalCfg.GetInt("3D.Renderer") != renderer3D_Software);
+}
+
+void EmuInstance::initOpenGL()
+{
+    for (int i = 0; i < kMaxWindows; i++)
+    {
+        if (windowList[i])
+            windowList[i]->initOpenGL();
+    }
+
+    setVSyncGL(true);
+}
+
+void EmuInstance::deinitOpenGL()
+{
+    for (int i = 0; i < kMaxWindows; i++)
+    {
+        if (windowList[i])
+            windowList[i]->deinitOpenGL();
+    }
+}
+
+void EmuInstance::setVSyncGL(bool vsync)
+{
+    int intv;
+
+    vsync = vsync && globalCfg.GetBool("Screen.VSync");
+    if (vsync)
+        intv = globalCfg.GetInt("Screen.VSyncInterval");
+    else
+        intv = 0;
+
+    for (int i = 0; i < kMaxWindows; i++)
+    {
+        if (windowList[i])
+            windowList[i]->setGLSwapInterval(intv);
+    }
+}
+
+void EmuInstance::makeCurrentGL()
+{
+    mainWindow->makeCurrentGL();
+}
+
+void EmuInstance::drawScreenGL()
+{
+    for (int i = 0; i < kMaxWindows; i++)
+    {
+        if (windowList[i])
+            windowList[i]->drawScreenGL();
+    }
+}
+
+
 int EmuInstance::lastSep(const std::string& path)
 {
     int i = path.length() - 1;
diff --git a/src/frontend/qt_sdl/EmuInstance.h b/src/frontend/qt_sdl/EmuInstance.h
index 6ef485ba..87f4226d 100644
--- a/src/frontend/qt_sdl/EmuInstance.h
+++ b/src/frontend/qt_sdl/EmuInstance.h
@@ -88,6 +88,13 @@ public:
 
     void osdAddMessage(unsigned int color, const char* fmt, ...);
 
+    bool usesOpenGL();
+    void initOpenGL();
+    void deinitOpenGL();
+    void setVSyncGL(bool vsync);
+    void makeCurrentGL();
+    void drawScreenGL();
+
     // return: empty string = setup OK, non-empty = error message
     QString verifySetup();
 
diff --git a/src/frontend/qt_sdl/EmuThread.cpp b/src/frontend/qt_sdl/EmuThread.cpp
index 38fc29cf..b36ed7d3 100644
--- a/src/frontend/qt_sdl/EmuThread.cpp
+++ b/src/frontend/qt_sdl/EmuThread.cpp
@@ -66,9 +66,6 @@ using namespace melonDS;
 // TEMP
 extern bool RunningSomething;
 //extern MainWindow* mainWindow;
-extern int autoScreenSizing;
-extern int videoRenderer;
-extern bool videoSettingsDirty;
 
 
 EmuThread::EmuThread(EmuInstance* inst, QObject* parent) : QThread(parent)
@@ -83,10 +80,6 @@ EmuThread::EmuThread(EmuInstance* inst, QObject* parent) : QThread(parent)
 
 void EmuThread::attachWindow(MainWindow* window)
 {
-    windowList.push_back(window);
-    window->attachEmuThread(this);
-    mainWindow = windowList.front();
-
     connect(this, SIGNAL(windowUpdate()), window->panel, SLOT(repaint()));
     connect(this, SIGNAL(windowTitleChange(QString)), window, SLOT(onTitleUpdate(QString)));
     connect(this, SIGNAL(windowEmuStart()), window, SLOT(onEmuStart()));
@@ -115,14 +108,11 @@ void EmuThread::detachWindow(MainWindow* window)
     disconnect(this, SIGNAL(windowFullscreenToggle()), window, SLOT(onFullscreenToggled()));
     disconnect(this, SIGNAL(swapScreensToggle()), window->actScreenSwap, SLOT(trigger()));
     disconnect(this, SIGNAL(screenEmphasisToggle()), window, SLOT(onScreenEmphasisToggled()));
-
-    windowList.remove(window);
-    window->attachEmuThread(nullptr);
-    mainWindow = windowList.front();
 }
 
 void EmuThread::run()
 {
+    Config::Table& globalCfg = emuInstance->getGlobalConfig();
     u32 mainScreenPos[3];
     Platform::FileHandle* file;
 
@@ -136,25 +126,18 @@ void EmuThread::run()
 
     videoSettingsDirty = false;
 
-    if (mainWindow->hasOpenGL())
+    if (emuInstance->usesOpenGL())
     {
-        //screenGL = static_cast<ScreenPanelGL*>(mainWindow->panel);
-        //screenGL->initOpenGL();
-        //mainWindow->initOpenGL();
-        for (auto window : windowList)
-            window->initOpenGL();
+        emuInstance->initOpenGL();
 
         useOpenGL = true;
-        videoRenderer = Config::_3DRenderer;
+        videoRenderer = globalCfg.GetInt("3D.Renderer");
     }
     else
     {
-        //screenGL = nullptr;
         useOpenGL = false;
         videoRenderer = 0;
     }
-    //screenGL = nullptr;
-    //videoRenderer = 0;
 
     updateRenderer();
 
@@ -253,20 +236,15 @@ void EmuThread::run()
             }
 
             if (useOpenGL)
-                mainWindow->makeCurrentGL();
+                emuInstance->makeCurrentGL();
 
             // update render settings if needed
-            // HACK:
-            // once the fast forward hotkey is released, we need to update vsync
-            // to the old setting again
-            if (videoSettingsDirty || emuInstance->hotkeyReleased(HK_FastForward))
+            if (videoSettingsDirty)
             {
                 if (useOpenGL)
                 {
-                    for (auto window : windowList)
-                        window->setGLSwapInterval(Config::ScreenVSync ? Config::ScreenVSyncInterval : 0);
-
-                    videoRenderer = Config::_3DRenderer;
+                    emuInstance->setVSyncGL(true);
+                    videoRenderer = globalCfg.GetInt("3D.Renderer");
                 }
 #ifdef OGLRENDERER_ENABLED
                 else
@@ -353,9 +331,7 @@ void EmuThread::run()
             else
             {
                 FrontBuffer = emuInstance->nds->GPU.FrontBuffer;
-                //screenGL->drawScreenGL();
-                for (auto window : windowList)
-                    window->drawScreenGL();
+                emuInstance->drawScreenGL();
             }
 
 #ifdef MELONCAP
@@ -373,11 +349,17 @@ void EmuThread::run()
 
             bool fastforward = emuInstance->hotkeyDown(HK_FastForward);
 
-            if (fastforward && useOpenGL && Config::ScreenVSync)
+            if (useOpenGL)
             {
-                //screenGL->setSwapInterval(0);
-                for (auto window : windowList)
-                    window->setGLSwapInterval(0);
+                // when using OpenGL: when toggling fast-forward, change the vsync interval
+                if (emuInstance->hotkeyPressed(HK_FastForward))
+                {
+                    emuInstance->setVSyncGL(false);
+                }
+                else if (emuInstance->hotkeyReleased(HK_FastForward))
+                {
+                    emuInstance->setVSyncGL(true);
+                }
             }
 
             if (emuInstance->audioDSiVolumeSync && emuInstance->nds->ConsoleType == 1)
@@ -468,27 +450,20 @@ void EmuThread::run()
 
             if (useOpenGL)
             {
-                for (auto window : windowList)
-                    window->drawScreenGL();
+                emuInstance->drawScreenGL();
             }
 
             ContextRequestKind contextRequest = ContextRequest;
             if (contextRequest == contextRequest_InitGL)
             {
-                //screenGL = static_cast<ScreenPanelGL*>(mainWindow->panel);
-                //screenGL->initOpenGL();
-                for (auto window : windowList)
-                    window->initOpenGL();
+                emuInstance->initOpenGL();
 
                 useOpenGL = true;
                 ContextRequest = contextRequest_None;
             }
             else if (contextRequest == contextRequest_DeInitGL)
             {
-                //screenGL->deinitOpenGL();
-                //screenGL = nullptr;
-                for (auto window : windowList)
-                    window->deinitOpenGL();
+                emuInstance->deinitOpenGL();
 
                 useOpenGL = false;
                 ContextRequest = contextRequest_None;
@@ -608,16 +583,23 @@ void EmuThread::updateRenderer()
     }
     lastVideoRenderer = videoRenderer;
 
+    auto& cfg = emuInstance->getGlobalConfig();
     switch (videoRenderer)
     {
         case renderer3D_Software:
-            static_cast<SoftRenderer&>(emuInstance->nds->GPU.GetRenderer3D()).SetThreaded(Config::Threaded3D, emuInstance->nds->GPU);
+            static_cast<SoftRenderer&>(emuInstance->nds->GPU.GetRenderer3D()).SetThreaded(
+                    cfg.GetBool("3D.Soft.Threaded"),
+                    emuInstance->nds->GPU);
             break;
         case renderer3D_OpenGL:
-            static_cast<GLRenderer&>(emuInstance->nds->GPU.GetRenderer3D()).SetRenderSettings(Config::GL_BetterPolygons, Config::GL_ScaleFactor);
+            static_cast<GLRenderer&>(emuInstance->nds->GPU.GetRenderer3D()).SetRenderSettings(
+                    cfg.GetBool("3D.GL.BetterPolygons"),
+                    cfg.GetInt("3D.GL.ScaleFactor"));
             break;
         case renderer3D_OpenGLCompute:
-            static_cast<ComputeRenderer&>(emuInstance->nds->GPU.GetRenderer3D()).SetRenderSettings(Config::GL_ScaleFactor, Config::GL_HiresCoordinates);
+            static_cast<ComputeRenderer&>(emuInstance->nds->GPU.GetRenderer3D()).SetRenderSettings(
+                    cfg.GetInt("3D.GL.ScaleFactor"),
+                    cfg.GetBool("3D.GL.HiresCoordinates"));
             break;
         default: __builtin_unreachable();
     }
diff --git a/src/frontend/qt_sdl/EmuThread.h b/src/frontend/qt_sdl/EmuThread.h
index eb00ca07..638c6f01 100644
--- a/src/frontend/qt_sdl/EmuThread.h
+++ b/src/frontend/qt_sdl/EmuThread.h
@@ -67,6 +67,7 @@ public:
 
     void initContext();
     void deinitContext();
+    void updateVideoSettings() { videoSettingsDirty = true; }
 
     int FrontBuffer = 0;
     QMutex FrontBufferLock;
@@ -122,10 +123,6 @@ private:
 
     EmuInstance* emuInstance;
 
-    //ScreenPanelGL* screenGL;
-    MainWindow* mainWindow;
-    std::list<MainWindow*> windowList;
-
     int autoScreenSizing;
 
     int lastVideoRenderer = -1;
diff --git a/src/frontend/qt_sdl/Screen.cpp b/src/frontend/qt_sdl/Screen.cpp
index a86a6e44..78bdd91a 100644
--- a/src/frontend/qt_sdl/Screen.cpp
+++ b/src/frontend/qt_sdl/Screen.cpp
@@ -873,8 +873,6 @@ void ScreenPanelGL::initOpenGL()
     glEnableVertexAttribArray(0); // position
     glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, (void*)(0));
 
-
-    glContext->SetSwapInterval(Config::ScreenVSync ? Config::ScreenVSyncInterval : 0);
     transferLayout();
 }
 
diff --git a/src/frontend/qt_sdl/VideoSettingsDialog.cpp b/src/frontend/qt_sdl/VideoSettingsDialog.cpp
index cb593226..f0f4672b 100644
--- a/src/frontend/qt_sdl/VideoSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/VideoSettingsDialog.cpp
@@ -16,7 +16,6 @@
     with melonDS. If not, see http://www.gnu.org/licenses/.
 */
 
-#include <stdio.h>
 #include <QFileDialog>
 #include <QtGlobal>
 
@@ -30,21 +29,25 @@
 #include "ui_VideoSettingsDialog.h"
 
 
-inline bool UsesGL()
+inline bool VideoSettingsDialog::UsesGL()
 {
-    return (Config::ScreenUseGL != 0) || (Config::_3DRenderer != renderer3D_Software);
+    auto& cfg = emuInstance->getGlobalConfig();
+    return cfg.GetBool("Screen.UseGL") || (cfg.GetInt("3D.Renderer") != renderer3D_Software);
 }
 
 VideoSettingsDialog* VideoSettingsDialog::currentDlg = nullptr;
 
 void VideoSettingsDialog::setEnabled()
 {
-    bool softwareRenderer = Config::_3DRenderer == renderer3D_Software;
+    auto& cfg = emuInstance->getGlobalConfig();
+    int renderer = cfg.GetInt("3D.Renderer");
+
+    bool softwareRenderer = renderer == renderer3D_Software;
     ui->cbGLDisplay->setEnabled(softwareRenderer);
     ui->cbSoftwareThreaded->setEnabled(softwareRenderer);
     ui->cbxGLResolution->setEnabled(!softwareRenderer);
-    ui->cbBetterPolygons->setEnabled(Config::_3DRenderer == renderer3D_OpenGL);
-    ui->cbxComputeHiResCoords->setEnabled(Config::_3DRenderer == renderer3D_OpenGLCompute);
+    ui->cbBetterPolygons->setEnabled(renderer == renderer3D_OpenGL);
+    ui->cbxComputeHiResCoords->setEnabled(renderer == renderer3D_OpenGLCompute);
 }
 
 VideoSettingsDialog::VideoSettingsDialog(QWidget* parent) : QDialog(parent), ui(new Ui::VideoSettingsDialog)
@@ -52,14 +55,17 @@ VideoSettingsDialog::VideoSettingsDialog(QWidget* parent) : QDialog(parent), ui(
     ui->setupUi(this);
     setAttribute(Qt::WA_DeleteOnClose);
 
-    oldRenderer = Config::_3DRenderer;
-    oldGLDisplay = Config::ScreenUseGL;
-    oldVSync = Config::ScreenVSync;
-    oldVSyncInterval = Config::ScreenVSyncInterval;
-    oldSoftThreaded = Config::Threaded3D;
-    oldGLScale = Config::GL_ScaleFactor;
-    oldGLBetterPolygons = Config::GL_BetterPolygons;
-    oldHiresCoordinates = Config::GL_HiresCoordinates;
+    emuInstance = ((MainWindow*)parent)->getEmuInstance();
+
+    auto& cfg = emuInstance->getGlobalConfig();
+    oldRenderer = cfg.GetInt("3D.Renderer");
+    oldGLDisplay = cfg.GetBool("Screen.UseGL");
+    oldVSync = cfg.GetBool("Screen.VSync");
+    oldVSyncInterval = cfg.GetInt("Screen.VSyncInterval");
+    oldSoftThreaded = cfg.GetBool("3D.Soft.Threaded");
+    oldGLScale = cfg.GetInt("3D.GL.ScaleFactor");
+    oldGLBetterPolygons = cfg.GetBool("3D.GL.BetterPolygons");
+    oldHiresCoordinates = cfg.GetBool("3D.GL.HiresCoordinates");
 
     grp3DRenderer = new QButtonGroup(this);
     grp3DRenderer->addButton(ui->rb3DSoftware, renderer3D_Software);
@@ -70,7 +76,7 @@ VideoSettingsDialog::VideoSettingsDialog(QWidget* parent) : QDialog(parent), ui(
 #else
     connect(grp3DRenderer, SIGNAL(idClicked(int)), this, SLOT(onChange3DRenderer(int)));
 #endif
-    grp3DRenderer->button(Config::_3DRenderer)->setChecked(true);
+    grp3DRenderer->button(oldRenderer)->setChecked(true);
 
 #ifndef OGLRENDERER_ENABLED
     ui->rb3DOpenGL->setEnabled(false);
@@ -80,21 +86,21 @@ VideoSettingsDialog::VideoSettingsDialog(QWidget* parent) : QDialog(parent), ui(
     ui->rb3DCompute->setEnabled(false);
 #endif
 
-    ui->cbGLDisplay->setChecked(Config::ScreenUseGL != 0);
+    ui->cbGLDisplay->setChecked(oldGLDisplay != 0);
 
-    ui->cbVSync->setChecked(Config::ScreenVSync != 0);
-    ui->sbVSyncInterval->setValue(Config::ScreenVSyncInterval);
+    ui->cbVSync->setChecked(oldVSync != 0);
+    ui->sbVSyncInterval->setValue(oldVSyncInterval);
 
-    ui->cbSoftwareThreaded->setChecked(Config::Threaded3D != 0);
+    ui->cbSoftwareThreaded->setChecked(oldSoftThreaded);
 
     for (int i = 1; i <= 16; i++)
         ui->cbxGLResolution->addItem(QString("%1x native (%2x%3)").arg(i).arg(256*i).arg(192*i));
-    ui->cbxGLResolution->setCurrentIndex(Config::GL_ScaleFactor-1);
+    ui->cbxGLResolution->setCurrentIndex(oldGLScale-1);
 
-    ui->cbBetterPolygons->setChecked(Config::GL_BetterPolygons != 0);
-    ui->cbxComputeHiResCoords->setChecked(Config::GL_HiresCoordinates != 0);
+    ui->cbBetterPolygons->setChecked(oldGLBetterPolygons != 0);
+    ui->cbxComputeHiResCoords->setChecked(oldHiresCoordinates != 0);
 
-    if (!Config::ScreenVSync)
+    if (!oldVSync)
         ui->sbVSyncInterval->setEnabled(false);
     setVsyncControlEnable(UsesGL());
 
@@ -117,14 +123,15 @@ void VideoSettingsDialog::on_VideoSettingsDialog_rejected()
 {
     bool old_gl = UsesGL();
 
-    Config::_3DRenderer = oldRenderer;
-    Config::ScreenUseGL = oldGLDisplay;
-    Config::ScreenVSync = oldVSync;
-    Config::ScreenVSyncInterval = oldVSyncInterval;
-    Config::Threaded3D = oldSoftThreaded;
-    Config::GL_ScaleFactor = oldGLScale;
-    Config::GL_BetterPolygons = oldGLBetterPolygons;
-    Config::GL_HiresCoordinates = oldHiresCoordinates;
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetInt("3D.Renderer", oldRenderer);
+    cfg.SetBool("Screen.UseGL", oldGLDisplay);
+    cfg.SetBool("Screen.VSync", oldVSync);
+    cfg.SetInt("Screen.VSyncInterval", oldVSyncInterval);
+    cfg.SetBool("3D.Soft.Threaded", oldSoftThreaded);
+    cfg.SetInt("3D.GL.ScaleFactor", oldGLScale);
+    cfg.SetBool("3D.GL.BetterPolygons", oldGLBetterPolygons);
+    cfg.SetBool("3D.GL.HiresCoordinates", oldHiresCoordinates);
 
     emit updateVideoSettings(old_gl != UsesGL());
 
@@ -141,7 +148,8 @@ void VideoSettingsDialog::onChange3DRenderer(int renderer)
 {
     bool old_gl = UsesGL();
 
-    Config::_3DRenderer = renderer;
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetInt("3D.Renderer", renderer);
 
     setEnabled();
 
@@ -152,7 +160,8 @@ void VideoSettingsDialog::on_cbGLDisplay_stateChanged(int state)
 {
     bool old_gl = UsesGL();
 
-    Config::ScreenUseGL = (state != 0);
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetBool("Screen.UseGL", (state != 0));
 
     setVsyncControlEnable(UsesGL());
 
@@ -163,19 +172,25 @@ void VideoSettingsDialog::on_cbVSync_stateChanged(int state)
 {
     bool vsync = (state != 0);
     ui->sbVSyncInterval->setEnabled(vsync);
-    Config::ScreenVSync = vsync;
+
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetBool("Screen.VSync", vsync);
+
     emit updateVideoSettings(false);
 }
 
 void VideoSettingsDialog::on_sbVSyncInterval_valueChanged(int val)
 {
-    Config::ScreenVSyncInterval = val;
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetInt("Screen.VSyncInterval", val);
+
     emit updateVideoSettings(false);
 }
 
 void VideoSettingsDialog::on_cbSoftwareThreaded_stateChanged(int state)
 {
-    Config::Threaded3D = (state != 0);
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetBool("3D.Soft.Threaded", (state != 0));
 
     emit updateVideoSettings(false);
 }
@@ -185,7 +200,8 @@ void VideoSettingsDialog::on_cbxGLResolution_currentIndexChanged(int idx)
     // prevent a spurious change
     if (ui->cbxGLResolution->count() < 16) return;
 
-    Config::GL_ScaleFactor = idx+1;
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetInt("3D.GL.ScaleFactor", idx+1);
 
     setVsyncControlEnable(UsesGL());
 
@@ -194,14 +210,16 @@ void VideoSettingsDialog::on_cbxGLResolution_currentIndexChanged(int idx)
 
 void VideoSettingsDialog::on_cbBetterPolygons_stateChanged(int state)
 {
-    Config::GL_BetterPolygons = (state != 0);
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetBool("3D.GL.BetterPolygons", (state != 0));
 
     emit updateVideoSettings(false);
 }
 
 void VideoSettingsDialog::on_cbxComputeHiResCoords_stateChanged(int state)
 {
-    Config::GL_HiresCoordinates = (state != 0);
+    auto& cfg = emuInstance->getGlobalConfig();
+    cfg.SetBool("3D.GL.HiresCoordinates", (state != 0));
 
     emit updateVideoSettings(false);
 }
diff --git a/src/frontend/qt_sdl/VideoSettingsDialog.h b/src/frontend/qt_sdl/VideoSettingsDialog.h
index 97e0dbd0..1ff5c0ae 100644
--- a/src/frontend/qt_sdl/VideoSettingsDialog.h
+++ b/src/frontend/qt_sdl/VideoSettingsDialog.h
@@ -24,6 +24,7 @@
 
 namespace Ui { class VideoSettingsDialog; }
 class VideoSettingsDialog;
+class EmuInstance;
 
 class VideoSettingsDialog : public QDialog
 {
@@ -33,6 +34,8 @@ public:
     explicit VideoSettingsDialog(QWidget* parent);
     ~VideoSettingsDialog();
 
+    bool UsesGL();
+
     static VideoSettingsDialog* currentDlg;
     static VideoSettingsDialog* openDlg(QWidget* parent)
     {
@@ -73,6 +76,7 @@ private:
     void setEnabled();
 
     Ui::VideoSettingsDialog* ui;
+    EmuInstance* emuInstance;
 
     QButtonGroup* grp3DRenderer;
 
diff --git a/src/frontend/qt_sdl/Window.cpp b/src/frontend/qt_sdl/Window.cpp
index 33cdb46f..9c32639b 100644
--- a/src/frontend/qt_sdl/Window.cpp
+++ b/src/frontend/qt_sdl/Window.cpp
@@ -107,9 +107,6 @@ static bool FileIsSupportedFiletype(const QString& filename, bool insideArchive)
 extern CameraManager* camManager[2];
 extern bool camStarted[2];
 
-extern int videoRenderer;
-extern bool videoSettingsDirty;
-
 
 // AAAAAAA
 static bool FileExtensionInList(const QString& filename, const QStringList& extensions, Qt::CaseSensitivity cs = Qt::CaseInsensitive)
@@ -203,7 +200,8 @@ MainWindow::MainWindow(int id, EmuInstance* inst, QWidget* parent) :
     emuInstance(inst),
     globalCfg(inst->globalCfg),
     localCfg(inst->localCfg),
-    windowCfg(localCfg.GetTable("Window"+std::to_string(id), "Window0"))
+    windowCfg(localCfg.GetTable("Window"+std::to_string(id), "Window0")),
+    emuThread(inst->getEmuThread())
 {
     test_num = test++;
 #ifndef _WIN32
@@ -709,11 +707,6 @@ MainWindow::~MainWindow()
     delete[] actScreenAspectBot;
 }
 
-void MainWindow::attachEmuThread(EmuThread* thread)
-{
-    emuThread = thread;
-}
-
 void MainWindow::osdAddMessage(unsigned int color, const char* msg)
 {
     if (!showOSD) return;
@@ -731,16 +724,20 @@ void MainWindow::closeEvent(QCloseEvent* event)
     if (hasOGL)
     {
         // we intentionally don't unpause here
+        // TODO this ought to change if we do multi-window shiz
         emuThread->emuPause();
         emuThread->deinitContext();
     }
 
+    emuThread->detachWindow(this);
+
     QMainWindow::closeEvent(event);
 }
 
 void MainWindow::createScreenPanel()
 {
-    hasOGL = (Config::ScreenUseGL != 0) || (Config::_3DRenderer != 0);
+    hasOGL = globalCfg.GetBool("Screen.UseGL") ||
+            (globalCfg.GetInt("3D.Renderer") != renderer3D_Software);
 
     if (hasOGL)
     {
@@ -749,8 +746,7 @@ void MainWindow::createScreenPanel()
 
         panel = panelGL;
 
-        bool res = panelGL->createContext();
-        printf("WIN %d CONTEXT: %d\n", test_num, res);
+        panelGL->createContext();
     }
 
     if (!hasOGL)
@@ -777,7 +773,7 @@ GL::Context* MainWindow::getOGLContext()
 }
 
 void MainWindow::initOpenGL()
-{printf("WINDOW %d INIT OPENGL %d\n", test_num, hasOGL);
+{
     if (!hasOGL) return;
 
     ScreenPanelGL* glpanel = static_cast<ScreenPanelGL*>(panel);
@@ -2087,8 +2083,7 @@ void MainWindow::onUpdateVideoSettings(bool glchange)
         connect(emuThread, SIGNAL(windowUpdate()), panel, SLOT(repaint()));
     }
 
-    printf("update video settings\n");
-    videoSettingsDirty = true;
+    emuThread->updateVideoSettings();
 
     if (glchange)
     {
diff --git a/src/frontend/qt_sdl/Window.h b/src/frontend/qt_sdl/Window.h
index 2346240c..8209eb65 100644
--- a/src/frontend/qt_sdl/Window.h
+++ b/src/frontend/qt_sdl/Window.h
@@ -110,8 +110,6 @@ public:
     EmuInstance* getEmuInstance() { return emuInstance; }
     Config::Table& getWindowConfig() { return windowCfg; }
 
-    void attachEmuThread(EmuThread* thread);
-
     bool hasOpenGL() { return hasOGL; }
     GL::Context* getOGLContext();
     void initOpenGL();
diff --git a/src/frontend/qt_sdl/main.cpp b/src/frontend/qt_sdl/main.cpp
index 7f1aecab..10cebe5b 100644
--- a/src/frontend/qt_sdl/main.cpp
+++ b/src/frontend/qt_sdl/main.cpp
@@ -135,17 +135,9 @@ bool RunningSomething;
 //EmuThread* emuThread;
 EmuInstance* testinst;
 
-int autoScreenSizing = 0;
-
-int videoRenderer;
-bool videoSettingsDirty;
-
 CameraManager* camManager[2];
 bool camStarted[2];
 
-//extern int AspectRatiosNum;
-
-
 
 
 
@@ -299,7 +291,7 @@ int main(int argc, char** argv)
         QString errorStr = "Failed to initialize SDL. This could indicate an issue with your audio driver.\n\nThe error was: ";
         errorStr += err;
 
-        QMessageBox::critical(NULL, "melonDS", errorStr);
+        QMessageBox::critical(nullptr, "melonDS", errorStr);
         return 1;
     }
 
@@ -308,17 +300,10 @@ int main(int argc, char** argv)
     SDL_InitSubSystem(SDL_INIT_VIDEO);
     SDL_EnableScreenSaver(); SDL_DisableScreenSaver();
 
-    if (!Config::Load()) QMessageBox::critical(NULL, "melonDS", "Unable to write to config.\nPlease check the write permissions of the folder you placed melonDS in.");
-
-#define SANITIZE(var, min, max)  { var = std::clamp(var, min, max); }
-#ifdef OGLRENDERER_ENABLED
-    SANITIZE(Config::_3DRenderer, 0, 1); // 0 is the software renderer, 1 is the OpenGL renderer
-#else
-    SANITIZE(Config::_3DRenderer, 0, 0);
-#endif
-    SANITIZE(Config::ScreenVSyncInterval, 1, 20);
-    SANITIZE(Config::GL_ScaleFactor, 1, 16);
-#undef SANITIZE
+    if (!Config::Load())
+        QMessageBox::critical(nullptr,
+                              "melonDS",
+                              "Unable to write to config.\nPlease check the write permissions of the folder you placed melonDS in.");
 
     camStarted[0] = false;
     camStarted[1] = false;