Game Window Cursor Clipping
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Summary
This implementation allows you to clip the cursor to the game window such as in DOOM and DOOM Eternal (id Tech 6 - 7), also brings some fixes to various bugs on VGUI.

Requirements
- Knowledge of C++
- Knowledge of Source Engine
- Source SDK Base 2013 - Currently tested on Source SDK Base 2013 Multiplayer
Getting the Implementation/Code
First of all, you'll need the following files from the following GitHub repository:
Which you will copy to src/game/client/. You can also create a subfolder if you wish to, and copy these files there.
Implementation
Now head over to cdll_client_int.cpp' and include
#include "CCursorClipManagement.h"
Anywhere before
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"

In the same cpp, find CHLClient::PostInit() and add this to the end:
CCursorClipManagement::Init();
Lastly, find void OnRenderEnd() and add this to the end:
g_pCursorClipManager->Think();
Conclusion
You're all set! Compile your client project and check if it works.
Notes
- If you start the game with -tools, -dev, -developer, and -nocursorclipping the cursor clipping will be disabled and won't work by default.
- If you're compiling into a different platform, else than WIN32, the cursor clipping will be disabled and won't work by default.
- You can also add a ConVar to enable or disable this dynamically in-game, all you'll need to do is adding one more check on CCursorClipManagement::Think().
- If you do not want to check if the window is active or not every time OnRenderEnd() called, you can also do this by hooking into window events/messages. Check SetWindowsHookExA.