add d3d9 project structure

GDP/D3D9/Direct3D.h

@@ -0,0 +1,19 @@
+#pragma once
+#include <d3d9.h>
+
+#pragma comment(lib, "d3d9.lib")
+
+class Direct3D
+{
+public:
+	INT init(HWND hWnd, UINT width, UINT height, BOOL isFullscreen);
+	void beginScene();
+	void endScene();
+	void deInit();
+
+	IDirect3DDevice9* getDevice() const { return _pD3DDevice; }
+
+private:
+	IDirect3DDevice9* _pD3DDevice = nullptr; // our interface for api communication
+};
+