qt: add Direct3D 9 renderer

src/qt/qt_d3d9renderer.hpp

@@ -0,0 +1,44 @@
+#ifndef D3D9RENDERER_HPP
+#define D3D9RENDERER_HPP
+
+#include <QWidget>
+#include "qt_renderercommon.hpp"
+
+#include <windows.h>
+#include <d3d9.h>
+#include <atomic>
+
+class D3D9Renderer : public QWidget, public RendererCommon
+{
+    Q_OBJECT
+public:
+    explicit D3D9Renderer(QWidget *parent = nullptr);
+    ~D3D9Renderer();
+    bool hasBlitFunc() override { return true; }
+    void blit(int x, int y, int w, int h) override;
+    void finalize() override;
+
+protected:
+    void showEvent(QShowEvent* event) override;
+    void hideEvent(QHideEvent *event) override;
+    void resizeEvent(QResizeEvent *event) override;
+    void paintEvent(QPaintEvent *event) override;
+    bool event(QEvent* event) override;
+    QPaintEngine* paintEngine() const override { return nullptr; }
+
+signals:
+    void initialized();
+    void error(QString);
+
+private:
+    HWND windowHandle = 0;
+    D3DPRESENT_PARAMETERS params{};
+    IDirect3D9Ex* d3d9 = nullptr;
+    IDirect3DDevice9Ex* d3d9dev = nullptr;
+    IDirect3DSurface9* d3d9surface = nullptr;
+
+    std::atomic<bool> surfaceInUse{false}, finalized{false};
+    bool alreadyInitialized = false;
+};
+
+#endif // D3D9RENDERER_HPP