Add fullscreen flag

main.go

@@ -63,9 +63,11 @@ func runLoop(vid *video.Video) {
 
 func main() {
 	var GLVersion uint
+	var fullscreen bool
 	flag.StringVar(&state.Global.CorePath, "L", "", "Path to the libretro core")
 	flag.BoolVar(&state.Global.Verbose, "v", false, "Verbose logs")
 	flag.UintVar(&GLVersion, "glver", 32, "OpenGL version")
+	flag.BoolVar(&fullscreen, "fullscreen", false, "Force starting in full screen mode")
 	flag.Parse()
 	args := flag.Args()
 
@@ -81,6 +83,11 @@ func main() {
 		settings.Save()
 	}
 
+	if fullscreen {
+		settings.Settings.VideoFullscreen = fullscreen
+		settings.Save()
+	}
+
 	if err := glfw.Init(); err != nil {
 		log.Fatalln("failed to initialize glfw:", err)
 	}