qt: add Direct3D 9 renderer

src/qt/qt_rendererstack.hpp

@@ -45,7 +45,8 @@ public:
         OpenGL,
         OpenGLES,
         OpenGL3,
-        Vulkan
+        Vulkan,
+        Direct3D9
     };
     void switchRenderer(Renderer renderer);
 
@@ -72,10 +73,12 @@ public:
 
 signals:
     void blitToRenderer(int buf_idx, int x, int y, int w, int h);
+    void blit(int x, int y, int w, int h);
     void rendererChanged();
 
 public slots:
-    void blit(int x, int y, int w, int h);
+    void blitCommon(int x, int y, int w, int h);
+    void blitRenderer(int x, int y, int w, int h);
     void mousePoll();
 
 private:
@@ -98,6 +101,7 @@ private:
 
     RendererCommon          *rendererWindow { nullptr };
     std::unique_ptr<QWidget> current;
+    std::atomic<bool> directBlitting{false};
 };
 
 #endif // QT_RENDERERCONTAINER_HPP