Add command-line switches to force X11 and Wayland SDL drivers

Source/Engine/Engine/CommandLine.cpp

@@ -145,6 +145,12 @@ bool CommandLine::Parse(const Char* cmdLine)
     PARSE_BOOL_SWITCH("-monolog ", MonoLog);
     PARSE_BOOL_SWITCH("-mute ", Mute);
     PARSE_BOOL_SWITCH("-lowdpi ", LowDPI);
+
+#if PLATFORM_LINUX && PLATFORM_SDL
+    PARSE_BOOL_SWITCH("-wayland ", Wayland);
+    PARSE_BOOL_SWITCH("-x11 ", X11);
+#endif
+
 #if USE_EDITOR
     PARSE_BOOL_SWITCH("-clearcache ", ClearCache);
     PARSE_BOOL_SWITCH("-clearcooker ", ClearCookerCache);

Source/Engine/Engine/CommandLine.h

@@ -127,6 +127,20 @@ public:
         /// </summary>
         Nullable<bool> LowDPI;
 
+#if PLATFORM_LINUX && PLATFORM_SDL
+
+        /// <summary>
+        /// -wayland (prefer Wayland over X11 as display server)
+        /// </summary>
+        Nullable<bool> Wayland;
+
+        /// <summary>
+        /// -x11 (prefer X11 over Wayland as display server)
+        /// </summary>
+        Nullable<bool> X11;
+
+#endif
+
 #if USE_EDITOR
         /// <summary>
         /// -project !path! (Startup project path)

Source/Engine/Platform/SDL/SDLPlatform.cpp

@@ -102,6 +102,8 @@ void SDLPlatform::LogInfo()
     LOG(Info, "Using SDL version {}.{}.{} ({}), runtime: {}.{}.{} ({})",
         SDL_VERSIONNUM_MAJOR(SDL_VERSION), SDL_VERSIONNUM_MINOR(SDL_VERSION), SDL_VERSIONNUM_MICRO(SDL_VERSION), String(SDL_REVISION),
         SDL_VERSIONNUM_MAJOR(runtimeVersion), SDL_VERSIONNUM_MINOR(runtimeVersion), SDL_VERSIONNUM_MICRO(runtimeVersion), String(SDL_GetRevision()));
+
+    LOG(Info, "SDL video driver: {}", String(SDL_GetCurrentVideoDriver()));
 }
 
 bool SDLPlatform::CheckWindowDragging(Window* window, WindowHitCodes hit)