From c84d8acff9b089aaf0fb407542f95e8ff8e5dd60 Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Tue, 15 Jun 2021 18:14:10 +0200
Subject: [PATCH] CIrrDeviceWin32: readd fullscreen using borderless maximized
 window

---
 source/Irrlicht/CIrrDeviceWin32.cpp | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/source/Irrlicht/CIrrDeviceWin32.cpp b/source/Irrlicht/CIrrDeviceWin32.cpp
index e0037b02..09fb7ab1 100644
--- a/source/Irrlicht/CIrrDeviceWin32.cpp
+++ b/source/Irrlicht/CIrrDeviceWin32.cpp
@@ -1416,8 +1416,24 @@ bool CIrrDeviceWin32::switchToFullScreen()
 	if (!CreationParams.Fullscreen)
 		return true;
 
-	// To be filled...
-	return true;
+	// No border, title bar, etc. is already set up through getWindowStyle()
+	// We only set the window size to match the monitor.
+
+	MONITORINFO mi;
+	mi.cbSize = sizeof(mi);
+	if (GetMonitorInfo(MonitorFromWindow(HWnd,MONITOR_DEFAULTTOPRIMARY),&mi))
+	{
+		UINT flags = SWP_NOCOPYBITS|SWP_NOOWNERZORDER|SWP_FRAMECHANGED;
+		SetWindowPos(HWnd, HWND_TOP, mi.rcMonitor.left, mi.rcMonitor.top,
+			mi.rcMonitor.right - mi.rcMonitor.left,
+			mi.rcMonitor.bottom - mi.rcMonitor.top, flags);
+	}
+	else
+	{
+		CreationParams.Fullscreen = false;
+	}
+
+	return CreationParams.Fullscreen;
 }