Added DirectX hooks

Warning: DX9 doesn't support resizing (TODO), DX12 has not beed tested and is not finished.
No OpenGL support for now.

overlay_experimental/Hook_Manager.h

@@ -0,0 +1,46 @@
+#ifndef __INCLUDED_HOOK_BASE_H__
+#define __INCLUDED_HOOK_BASE_H__
+
+#include <Windows.h>
+#include <vector>
+#include "Base_Hook.h"
+
+class Hook_Manager
+{
+    friend class Base_Hook;
+public:
+    using overlayProc_t = void(*)(int,int);
+    using hookReady_t = void(*)(void*);
+
+protected:
+    std::vector<Base_Hook*> _hooks;
+
+    WNDPROC _gameWndProc;       // The game main windows proc
+    HWND _gameHWnd;             // The game main window
+    bool _showOverlay;          // Should we render the overlay
+    bool _isSet;                // Is the renderer hooked ?
+    bool _LoadLibraryHooked;    // Are the LoadLibrary functions hooked ?
+    class Steam_Overlay* overlay;
+
+    Hook_Manager();
+    virtual ~Hook_Manager();
+
+    void HookLoadLibrary();
+    void UnHookLoadLibrary();
+
+public:
+    static Hook_Manager& Inst();
+
+    void HookRenderer(Steam_Overlay *overlay);
+
+    // Set the found hook and free all other hooks
+    void FoundHook(Base_Hook *hook);
+
+    inline void AddHook(Base_Hook* hook) { _hooks.push_back(hook); }
+    void ChangeGameWindow(HWND hWnd) const;
+    void CallOverlayProc(int width, int height) const;
+    Steam_Overlay* GetOverlay() const { return overlay; }
+};
+
+
+#endif//__INCLUDED_HOOK_BASE_H__