Workaround for scrolling and clicking on other windows in Skyrim

SkyrimBorderlessMultiMonitorFix.cpp

#include <Windows.h>
#include <Psapi.h>

static const wchar_t * const targetProcesses[] = {
	L"\\skyrimse.exe",
	L"\\skyrim.exe",
	//L"\\notepad.exe",
};

bool clipProcess(wchar_t const* processName)
{
	for (wchar_t const* const* targetProcess = targetProcesses;
		targetProcess < (targetProcesses + ARRAYSIZE(targetProcesses));
		targetProcess++)
	{
		wchar_t const* exe = wcsstr(processName, *targetProcess);
		if (exe == (processName + wcslen(processName) - wcslen(*targetProcess)))
		{
			return true;
		}
	}

	return false;
}

void CALLBACK handleForegroundWindow(
	HWINEVENTHOOK hWinEventHook,
	DWORD         event,
	HWND          hwnd,
	LONG          idObject,
	LONG          idChild,
	DWORD         idEventThread,
	DWORD         dwmsEventTime)
{
	auto fgWindow = GetForegroundWindow();
	DWORD fgProcessId;
	GetWindowThreadProcessId(fgWindow, &fgProcessId);

	auto fgProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, fgProcessId);

	wchar_t processName[MAX_PATH];
	auto nameLen = GetProcessImageFileNameW(fgProcess, processName, ARRAYSIZE(processName));
	processName[nameLen] = 0;

	_wcslwr_s(processName);
	bool enable = clipProcess(processName);

	RECT fgRect;
	GetClientRect(fgWindow, &fgRect);
	
	POINT tl { fgRect.left, fgRect.top };
	POINT br { fgRect.right, fgRect.bottom };

	ClientToScreen(fgWindow, &tl);
	ClientToScreen(fgWindow, &br);

	fgRect = { tl.x, tl.y, br.x, br.y };
	ClipCursor(enable ? &fgRect : nullptr);
}

int main(int argc, char **argv)
{
	SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, nullptr, handleForegroundWindow, 0, 0, WINEVENT_OUTOFCONTEXT);
	handleForegroundWindow(NULL, 0, NULL, 0, 0, 0, 0);

	for (;;)
	{
		MSG msg;

		if (GetMessage(&msg, NULL, 0, 0))
			break;

		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
}