From efdb86dcbb467232803c370a635c2bf12729361f Mon Sep 17 00:00:00 2001
From: Hecklezz <tj8@live.com.au>
Date: Mon, 5 May 2025 19:46:35 +1000
Subject: Fixes fullscreen mode in Windows 11 24H2

---
 indra/newview/llappviewerwin32.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'indra/newview/llappviewerwin32.cpp')

diff --git a/indra/newview/llappviewerwin32.cpp b/indra/newview/llappviewerwin32.cpp
index aaf2a7ea3e..94fc097b0f 100644
--- a/indra/newview/llappviewerwin32.cpp
+++ b/indra/newview/llappviewerwin32.cpp
@@ -816,6 +816,29 @@ bool LLAppViewerWin32::reportCrashToBugsplat(void* pExcepInfo)
     return false;
 }
 
+bool LLAppViewerWin32::initWindow()
+{
+    // This is a workaround/hotfix for a change in Windows 11 24H2 (and possibly later)
+    // Where the window width and height need to correctly reflect an available FullScreen size
+    if (gSavedSettings.getBOOL("FullScreen"))
+    {
+        DEVMODE dev_mode;
+        ::ZeroMemory(&dev_mode, sizeof(DEVMODE));
+        dev_mode.dmSize = sizeof(DEVMODE);
+        if (EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dev_mode))
+        {
+            gSavedSettings.setU32("WindowWidth", dev_mode.dmPelsWidth);
+            gSavedSettings.setU32("WindowHeight", dev_mode.dmPelsHeight);
+        }
+        else
+        {
+            LL_WARNS("AppInit") << "Unable to set WindowWidth and WindowHeight for FullScreen mode" << LL_ENDL;
+        }
+    }
+
+    return LLAppViewer::initWindow();
+}
+
 void LLAppViewerWin32::initLoggingAndGetLastDuration()
 {
     LLAppViewer::initLoggingAndGetLastDuration();
-- 
cgit v1.2.3