diff -r a03f245243b0 -r e33bcb9d5e9c qmlfrontend/hwengine.cpp
--- a/qmlfrontend/hwengine.cpp	Sun Dec 24 16:56:22 2017 +0100
+++ b/qmlfrontend/hwengine.cpp	Mon Dec 25 00:58:47 2017 +0100
@@ -2,6 +2,7 @@
 
 #include <QDebug>
 #include <QLibrary>
+#include <QQmlEngine>
 
 extern "C" {
 RunEngine_t* flibRunEngine;
@@ -46,6 +47,20 @@
     flibFree();
 }
 
+static QObject* hwengine_singletontype_provider(QQmlEngine* engine, QJSEngine* scriptEngine)
+{
+    Q_UNUSED(scriptEngine)
+
+    HWEngine* hwengine = new HWEngine(engine);
+    return hwengine;
+}
+
+void HWEngine::exposeToQML()
+{
+    qDebug("HWEngine::exposeToQML");
+    qmlRegisterSingletonType<HWEngine>("Hedgewars.Engine", 1, 0, "HWEngine", hwengine_singletontype_provider);
+}
+
 void HWEngine::guiMessagesCallback(void* context, MessageType mt, const char* msg, uint32_t len)
 {
     HWEngine* obj = reinterpret_cast<HWEngine*>(context);
@@ -60,23 +75,42 @@
 {
     switch (mt) {
     case MSG_RENDERINGPREVIEW: {
+        qDebug("MSG_RENDERINGPREVIEW");
         emit previewIsRendering();
         break;
     }
     case MSG_PREVIEW: {
+        qDebug("MSG_PREVIEW");
         emit previewImageChanged();
         break;
     }
     case MSG_PREVIEWHOGCOUNT: {
+        qDebug("MSG_PREVIEWHOGCOUNT");
         emit previewHogCountChanged((quint8)msg.data()[0]);
         break;
     }
+    case MSG_TONET: {
+        qDebug("MSG_TONET");
+        break;
+    }
+    case MSG_GAMEFINISHED: {
+        qDebug("MSG_GAMEFINISHED");
+        break;
+    }
     }
 }
 
 void HWEngine::getPreview()
 {
-    m_runQueue.append(GameConfig());
+    GameConfig cfg;
+    cfg.cmdSeed("superseed");
+    m_runQueue.append(cfg);
+    flibIpcSetEngineBarrier();
+    for (const QByteArray& b : m_runQueue[0].config()) {
+        qDebug() << "[frontend] sending msg of size" << b.size();
+        flibIpcToEngineRaw(b.data(), b.size());
+    }
+    flibIpcRemoveBarrierFromEngineQueue();
     flibRunEngine(m_runQueue[0].argc(), m_runQueue[0].argv());
 }