Add IrrlichtDevice::isWindowVisible for Android

include/IrrlichtDevice.h

@@ -177,6 +177,10 @@ namespace irr
 		/** \return True if window is fullscreen. */
 		virtual bool isFullscreen() const = 0;
 
+		//! Checks if the window could possibly be visible.
+		//! Currently, this only returns false when the app is paused on Android.
+		virtual bool isWindowVisible() const { return true; };
+
 		//! Get the current color format of the window
 		/** \return Color format of the window. */
 		virtual video::ECOLOR_FORMAT getColorFormat() const = 0;

source/Irrlicht/Android/CIrrDeviceAndroid.cpp

@@ -193,6 +193,11 @@ bool CIrrDeviceAndroid::isWindowMinimized() const
 	return !Focused;
 }
 
+bool CIrrDeviceAndroid::isWindowVisible() const
+{
+	return !Paused;
+}
+
 void CIrrDeviceAndroid::closeDevice()
 {
 	ANativeActivity_finish(Android->activity);

source/Irrlicht/Android/CIrrDeviceAndroid.h

@@ -36,6 +36,8 @@ namespace irr
 
 		virtual bool isWindowMinimized() const;
 
+		virtual bool isWindowVisible() const;
+
 		virtual void closeDevice();
 
 		virtual void setResizable(bool resize = false);