Merge remote-tracking branch 'secondlife/release/26.4' into 26.4

1 files changed, 313 insertions, 28 deletions

diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp
index 5793254ded..7f371ff0cf 100644
--- a/indra/llwindow/llwindowwin32.cpp
+++ b/indra/llwindow/llwindowwin32.cpp
@@ -177,6 +177,19 @@ void show_window_creation_error(const std::string& title)
     LL_WARNS("Window") << title << LL_ENDL;
 }
 
+static bool is_thread_from_current_process(DWORD thread_id)
+{
+    HANDLE thread_handle = OpenThread(THREAD_QUERY_LIMITED_INFORMATION, FALSE, thread_id);
+    if (!thread_handle)
+    {
+        return false;
+    }
+
+    const DWORD process_id = GetProcessIdOfThread(thread_handle);
+    CloseHandle(thread_handle);
+    return process_id == GetCurrentProcessId();
+}
+
 HGLRC SafeCreateContext(HDC &hdc)
 {
     __try
@@ -214,6 +227,7 @@ HKL     LLWindowWin32::sWinInputLocale = 0;
 DWORD   LLWindowWin32::sWinIMEConversionMode = IME_CMODE_NATIVE;
 DWORD   LLWindowWin32::sWinIMESentenceMode = IME_SMODE_AUTOMATIC;
 LLCoordWindow LLWindowWin32::sWinIMEWindowPosition(-1,-1);
+HMODULE LLWindowWin32::sGLDLLHandle = nullptr;
 
 static HWND sWindowHandleForMessageBox = NULL;
 
@@ -518,6 +532,7 @@ LLWindowWin32::LLWindowWin32(LLWindowCallbacks* callbacks,
     :
     LLWindow(callbacks, fullscreen, flags),
     mAbsoluteCursorPosition(false),
+    mReceivedSCClose(false),
     mMaxGLVersion(max_gl_version),
     mMaxCores(max_cores)
 {
@@ -525,7 +540,7 @@ LLWindowWin32::LLWindowWin32(LLWindowCallbacks* callbacks,
     mWindowThread = new LLWindowWin32Thread();
 
     //MAINT-516 -- force a load of opengl32.dll just in case windows went sideways
-    LoadLibrary(L"opengl32.dll");
+    sGLDLLHandle = LoadLibrary(L"opengl32.dll");
 
     // Request high-performance GPU before creating OpenGL context
     // This increases probability of discrete GPU being used when
@@ -1432,7 +1447,7 @@ bool LLWindowWin32::switchContext(bool fullscreen, const LLCoordScreen& size, bo
     catch (...)
     {
         LOG_UNHANDLED_EXCEPTION("ChoosePixelFormat");
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
@@ -1443,7 +1458,7 @@ bool LLWindowWin32::switchContext(bool fullscreen, const LLCoordScreen& size, bo
     if (!DescribePixelFormat(mhDC, pixel_format, sizeof(PIXELFORMATDESCRIPTOR),
         &pfd))
     {
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtDescErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtDescErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
@@ -1481,7 +1496,7 @@ bool LLWindowWin32::switchContext(bool fullscreen, const LLCoordScreen& size, bo
 
     if (!SetPixelFormat(mhDC, pixel_format, &pfd))
     {
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtSetErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtSetErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
@@ -1489,14 +1504,14 @@ bool LLWindowWin32::switchContext(bool fullscreen, const LLCoordScreen& size, bo
 
     if (!(mhRC = SafeCreateContext(mhDC)))
     {
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBGLContextErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBGLContextErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
 
     if (!wglMakeCurrent(mhDC, mhRC))
     {
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBGLContextActErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBGLContextActErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
@@ -1702,14 +1717,14 @@ const   S32   max_format  = (S32)num_formats - 1;
 
         if (!mhDC)
         {
-            LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBDevContextErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+            LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBDevContextErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
             close();
             return false;
         }
 
         if (!SetPixelFormat(mhDC, pixel_format, &pfd))
         {
-            LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtSetErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+            LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtSetErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
             close();
             return false;
         }
@@ -1741,7 +1756,7 @@ const   S32   max_format  = (S32)num_formats - 1;
     {
         LL_WARNS("Window") << "No wgl_ARB_pixel_format extension!" << LL_ENDL;
         // cannot proceed without wgl_ARB_pixel_format extension, shutdown same as any other gGLManager.initGL() failure
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBVideoDrvErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBVideoDrvErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
@@ -1750,7 +1765,7 @@ const   S32   max_format  = (S32)num_formats - 1;
     if (!DescribePixelFormat(mhDC, pixel_format, sizeof(PIXELFORMATDESCRIPTOR),
         &pfd))
     {
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtDescErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBPixelFmtDescErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
@@ -1772,14 +1787,16 @@ const   S32   max_format  = (S32)num_formats - 1;
 
     if (!wglMakeCurrent(mhDC, mhRC))
     {
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBGLContextActErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBGLContextActErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
 
+    gGLManager.initWGL(); // Reinit WGL functions once we have our full context
+
     if (!gGLManager.initGL())
     {
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBVideoDrvErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBVideoDrvErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
         close();
         return false;
     }
@@ -1987,7 +2004,7 @@ void* LLWindowWin32::createSharedContext()
     if (!rc && !(rc = wglCreateContext(mhDC)))
     {
         close();
-        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBGLContextErr"), 8/*LAST_EXEC_GRAPHICS_INIT*/);
+        LLError::LLUserWarningMsg::show(mCallbacks->translateString("MBGLContextErr"), LLError::LLUserWarningMsg::ERROR_INIT_FAILED);
     }
 
     return rc;
@@ -2472,6 +2489,15 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
                 update_width, update_height));
             break;
         }
+        case WM_ERASEBKGND:
+        {
+            RECT client_rect;
+            if (GetClientRect(h_wnd, &client_rect))
+            {
+                FillRect((HDC)w_param, &client_rect, (HBRUSH)GetStockObject(BLACK_BRUSH));
+            }
+            return 1;
+        }
         case WM_PARENTNOTIFY:
         {
             break;
@@ -2506,23 +2532,27 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
             break;
         }
 
-        case WM_POWERBROADCAST:
-        {
-            // Might need to register for power broadcast interface
-            // Todo: log monitor suspending and resuming.
-            LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_POWERBROADCAST");
-            LL_INFOS("Window") << "Received WM_POWERBROADCAST with wParam: 0x" << std::hex << (uintptr_t)w_param << " lParam: 0x" << (uintptr_t)l_param << std::dec << LL_ENDL;
-            break;
-        }
-
         case WM_ACTIVATEAPP:
         {
             LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_ACTIVATEAPP");
+            // Resolve ownership before deferring the work because thread IDs can
+            // be reused after a thread exits.
+            const bool activating_same_process_thread =
+                !w_param && is_thread_from_current_process(static_cast<DWORD>(l_param));
             window_imp->post([=]()
                 {
                     // This message should be sent whenever the app gains or loses focus.
                     BOOL activating = (BOOL)w_param;
 
+                    // Native dialogs run on a worker thread. Moving focus between
+                    // the viewer and one of those dialogs must not be treated as
+                    // switching to another application: in fullscreen that would
+                    // minimize the viewer and hide its owned dialog.
+                    if (!activating && activating_same_process_thread)
+                    {
+                        activating = TRUE;
+                    }
+
                     if (window_imp->mFullscreen)
                     {
                         // When we run fullscreen, restoring or minimizing the app needs
@@ -2572,8 +2602,15 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
         case WM_SYSCOMMAND:
         {
             LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_SYSCOMMAND");
-            switch (w_param)
+            switch (w_param & 0xFFF0)
             {
+            case SC_CLOSE:
+                // User clicked close from system menu/taskbar or 'end process' from task manager
+                // Do nothing, will cause WM_CLOSE.
+                // If we don't get this message before WM_CLOSE, we are likely getting
+                // a kill from some external program. Win11 task manager Does cause SC_CLOSE.
+                window_imp->mReceivedSCClose = true;
+                break;
             case SC_KEYMENU:
                 // Disallow the ALT key from triggering the default system menu.
                 return 0;
@@ -2589,9 +2626,30 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
         {
             LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_CLOSE");
             window_imp->mWindowThread->pingWindowTimeout("WM_CLOSE");
-            // todo: WM_CLOSE can be caused by user and by task manager,
-            // distinguish these cases.
-            // For now assume it is always user.
+
+            window_imp->mCallbacks->handlePreCloseRequest(); // mark app as potentially closing
+            if (!window_imp->mReceivedSCClose)
+            {
+                // Some external program is trying to close the app.
+                // Assume that it's going to destroy process if it fails
+                // and try to fast-quit without confirmation or cleanup.
+                window_imp->post([=]()
+                {
+                    // Check if app needs cleanup or can be closed immediately.
+                    if (window_imp->mCallbacks->handleSessionExit(window_imp))
+                    {
+                        // Get the app to initiate cleanup.
+                        window_imp->mCallbacks->handleQuit(window_imp);
+                    }
+                });
+                return 0;
+            }
+            window_imp->mReceivedSCClose = false;
+
+            // There is no way to tell the difference between a user issued
+            // WM_CLOSE or task manager's WM_CLOSE.
+            // Assume it is a user and ask for confirmation, but create a marker file.
+            // If App keeps doing something after a second, or gets 'destroy' message clear the marker.
             window_imp->post([=]()
                 {
                     // Will the app allow the window to close?
@@ -2613,6 +2671,16 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
             }
             return 0;
         }
+        case WM_NCDESTROY:
+            LL_INFOS("Window") << "Received WM_NCDESTROY" << LL_ENDL;
+            break;
+        case WM_WTSSESSION_CHANGE:
+        {
+            // Detects Remote Desktop disconnects, fast user switching, session logoff
+            // w_param: WTS_CONSOLE_CONNECT, WTS_CONSOLE_DISCONNECT, WTS_SESSION_LOGOFF, etc.
+            LL_INFOS("Window") << "Received WM_WTSSESSION_CHANGE with wParam: " << (U32)w_param << LL_ENDL;
+            break;
+        }
         case WM_QUERYENDSESSION:
         {
             // Generally means that OS is going to shut down or user is going to log off.
@@ -2635,8 +2703,10 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
                 || (end_session_flags & ENDSESSION_CRITICAL) // will shutdown regardless of app state
                 || (end_session_flags & ENDSESSION_LOGOFF)) // logoff, can delay shutdown
             {
+                window_imp->mCallbacks->handlePreCloseRequest(); // mark app as closing
                 window_imp->post([=]()
                 {
+                    LL_INFOS("Window") << "Shutting down due to session terminating" << LL_ENDL;
                     // Check if app needs cleanup or can be closed immediately.
                     if (window_imp->mCallbacks->handleSessionExit(window_imp))
                     {
@@ -2655,6 +2725,193 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
             // if session is ending OS is going to take care of it.
             return 0;
         }
+        case WM_POWERBROADCAST:
+        {
+            LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_POWERBROADCAST");
+            switch (w_param)
+            {
+            case PBT_APMSUSPEND:
+                LL_INFOS("Window") << "System is suspending (sleep/hibernate)" << LL_ENDL;
+                // System is about to enter sleep or hibernation
+                // Viewer can't function in hibernation, try to shut down.
+                // The system allows approximately two seconds for an
+                // application to handle this notification.
+
+                // Mark app as potentially closing, to minimize issues if OS does not recover.
+                window_imp->mCallbacks->handlePreCloseRequest();
+                window_imp->post([=]()
+                {
+                    window_imp->mCallbacks->handleSuspendRequest();
+                });
+                // Window thread normally doesn't block main thread, but OS can suspend
+                // immediately if we don't wait.
+                // Keep OS from suspending to give a chance to send stats.
+                ms_sleep(1000);
+                return TRUE;
+
+            case PBT_APMRESUMESUSPEND:
+                LL_INFOS("Window") << "System is resuming from suspend" << LL_ENDL;
+                window_imp->mCallbacks->handleCloseRequestCanceled();
+                return TRUE;
+
+            case PBT_APMPOWERSTATUSCHANGE:
+                LL_INFOS("Window") << "Power status has changed" << LL_ENDL;
+                // Power status change (AC/battery)
+                // Viewer requires high performance, not much we can do.
+                // about it, but log for diagnostic purposes (example:
+                // OS trying to throw viewer at an iGPU after this message)
+                return TRUE;
+
+            default:
+                LL_INFOS("Window") << "Received WM_POWERBROADCAST with wParam: 0x" << std::hex << (uintptr_t)w_param << " lParam: 0x" << (uintptr_t)l_param << std::dec << LL_ENDL;
+                break;
+            }
+            break;
+        }
+        case WM_POST_UNINSTALL_:
+        {
+            LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_POST_UNINSTALL_");
+            // Other instance, likely velopack, requested we quit.
+            // Don't trust PID alone (can be spoofed), verify the
+            // path for security purposes before processing.
+            // Verifying path isn't a strong varranty, if this turns
+            // up to be a risk, we will want something more secure.
+            // See sendShutdownToOtherInstances for the sender.
+
+            // LPARAM contains message type.
+            DWORD message_type = static_cast<DWORD>(l_param);
+            if (message_type == WM_POST_UNINSTALL_MSG_SHUTDOWN || message_type == WM_POST_UNINSTALL_MSG_UPDATE)
+            {
+                DWORD sender_process_id = static_cast<DWORD>(w_param);
+
+                // Make sure something didn't just send us our own process
+                DWORD our_process_id = GetCurrentProcessId();
+                if (our_process_id == sender_process_id)
+                {
+                    LL_WARNS("Window") << "Received WM_POST_UNINSTALL_ from our own process, ignoring" << LL_ENDL;
+                    break;
+                }
+
+                if (sender_process_id == 0)
+                {
+                    LL_WARNS("Window") << "Received WM_POST_UNINSTALL_ but couldn't get sender process ID" << LL_ENDL;
+                    break;
+                }
+
+                // Open the existing sender process to verify its executable path
+                HANDLE hSenderProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, sender_process_id);
+                if (!hSenderProcess)
+                {
+                    LL_WARNS("Window") << "Received WM_POST_UNINSTALL_ but couldn't open sender process" << LL_ENDL;
+                    break;
+                }
+
+                // Get the actual executable path of the sender
+                wchar_t sender_exe_path[MAX_PATH];
+                DWORD size = MAX_PATH;
+                bool got_sender_path = QueryFullProcessImageNameW(hSenderProcess, 0, sender_exe_path, &size) != 0;
+                CloseHandle(hSenderProcess);
+
+                if (!got_sender_path)
+                {
+                    LL_WARNS("Window") << "Received WM_POST_UNINSTALL_ but couldn't query sender executable path" << LL_ENDL;
+                    break;
+                }
+
+                // Extract directory from sender's executable path
+                wchar_t sender_dir[MAX_PATH];
+                wchar_t* file_part = nullptr;
+                DWORD result = GetFullPathNameW(sender_exe_path, MAX_PATH, sender_dir, &file_part);
+
+                if (result == 0 || result >= MAX_PATH)
+                {
+                    LL_WARNS("Window") << "Failed to normalize sender executable path" << LL_ENDL;
+                    break;
+                }
+
+                // Remove the filename to get just directory
+                if (file_part)
+                {
+                    *file_part = L'\0';
+                }
+
+                // Remove trailing backslash
+                size_t sender_dir_len = wcslen(sender_dir);
+                if (sender_dir_len > 0 && sender_dir[sender_dir_len - 1] == L'\\')
+                {
+                    sender_dir[sender_dir_len - 1] = L'\0';
+                    sender_dir_len--;
+                }
+
+                // Remove "\current" suffix from sender's path if present
+                const std::wstring current_suffix = L"\\current";
+                std::wstring sender_normalized_str(sender_dir);
+                if (sender_normalized_str.length() >= current_suffix.length() &&
+                    _wcsicmp(sender_normalized_str.c_str() + sender_normalized_str.length() - current_suffix.length(),
+                        current_suffix.c_str()) == 0)
+                {
+                    sender_normalized_str.resize(sender_normalized_str.length() - current_suffix.length());
+                }
+
+                // Get our executable directory for comparison
+                std::wstring our_wide = ll_convert<std::wstring>(gDirUtilp->getExecutableDir());
+
+                // Normalize our path
+                wchar_t our_normalized[MAX_PATH];
+                file_part = nullptr;
+
+                DWORD result2 = GetFullPathNameW(our_wide.c_str(), MAX_PATH, our_normalized, &file_part);
+
+                if (result2 == 0 || result2 >= MAX_PATH)
+                {
+                    LL_WARNS("Window") << "Failed to normalize our executable path" << LL_ENDL;
+                    break;
+                }
+
+                // Remove trailing backslash
+                size_t our_len = wcslen(our_normalized);
+                if (our_len > 0 && our_normalized[our_len - 1] == L'\\')
+                {
+                    our_normalized[our_len - 1] = L'\0';
+                    our_len--;
+                }
+
+                // Remove "\current" suffix from our path if present
+                std::wstring our_normalized_str(our_normalized);
+                if (our_normalized_str.length() >= current_suffix.length() &&
+                    _wcsicmp(our_normalized_str.c_str() + our_normalized_str.length() - current_suffix.length(),
+                        current_suffix.c_str()) == 0)
+                {
+                    our_normalized_str.resize(our_normalized_str.length() - current_suffix.length());
+                }
+
+                // Compare the normalized base installation paths (case-insensitive)
+                if (_wcsicmp(sender_normalized_str.c_str(), our_normalized_str.c_str()) == 0)
+                {
+                    window_imp->post([=]()
+                    {
+                        LL_INFOS("Window") << "Received valid shutdown request from verified same installation directory" << LL_ENDL;
+                        // Check if app needs cleanup or can be closed immediately.
+                        if (window_imp->mCallbacks->handleCloseRequest(window_imp, false))
+                        {
+                            // Get the app to initiate cleanup.
+                            window_imp->mCallbacks->handleQuit(window_imp);
+                        }
+                    });
+                }
+                else
+                {
+                    LL_WARNS("Window") << "Rejected shutdown request - sender not from our installation directory. "
+                        << "Sender: " << ll_convert_wide_to_string(sender_normalized_str)
+                        << " Our: " << ll_convert_wide_to_string(our_normalized_str) << LL_ENDL;
+                }
+            }
+            else
+            {
+                LL_WARNS("Window") << "Received invalid WM_POST_UNINSTALL_ message" << LL_ENDL;
+            }
+            break;
+        }
         case WM_COMMAND:
         {
             LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_COMMAND");
@@ -3183,9 +3440,19 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
 
         case WM_DISPLAYCHANGE:
         {
+            LL_PROFILE_ZONE_NAMED_CATEGORY_WIN32("mwp - WM_DISPLAYCHANGE");
             window_imp->mWindowThread->pingWindowTimeout("WM_DISPLAYCHANGE");
-            WINDOW_IMP_POST(window_imp->mCallbacks->handleDisplayChanged());
-            break;
+            window_imp->post([=]() {
+                window_imp->mCallbacks->handleDisplayChanged();
+                // Note: WM_DISPLAYCHANGE was passing to WM_SETFOCUS
+                // which might have been unintended and was messing with zones.
+                // handleFocus was copied over and return 0 added, but
+                // handleFocus might be not needed here.
+                // handleFocus resets mouse, closes popups and keys, which
+                // we probablt should do on 'display change'.
+                window_imp->mCallbacks->handleFocus(window_imp);
+            });
+            return 0;
         }
 
         case WM_SETFOCUS:
@@ -5053,6 +5320,18 @@ F32 LLWindowWin32::getSystemUISize()
 }
 
 //static
+PROC WINAPI LLWindowWin32::getProcAddress(const char* func)
+{
+    PROC ret_func = wglGetProcAddress(func);
+    if (!ret_func && sGLDLLHandle)
+    {
+        // Try to fallback to OpenGL32.dll
+        ret_func = GetProcAddress(sGLDLLHandle, func);
+    }
+    return ret_func;
+}
+
+//static
 std::vector<std::string> LLWindowWin32::getDisplaysResolutionList()
 {
     return sMonitorInfo.getResolutionsList();
@@ -5064,6 +5343,12 @@ std::vector<std::string> LLWindowWin32::getDynamicFallbackFontList()
     // Fonts previously in getFontListSans() have moved to fonts.xml.
     return std::vector<std::string>();
 }
+
+LLFontFallbackMatch LLWindowWin32::findFallbackFontForChar(llwchar wch)
+{
+    // Not implemented on Windows; would use DirectWrite (IDWriteFontFallback::MapCharacters).
+    return LLFontFallbackMatch();
+}
 #endif // LL_WINDOWS
 
 inline LLWindowWin32::LLWindowWin32Thread::LLWindowWin32Thread()