Android app switch front and back EGL is broken

[luorentong]

Hi Pavel Rojtberg:
Using glSurfaceView on Android to switch between the front and background causes a black screen to appear because glSurfaceView will recreate the Surface by slicing back to the Ogre body from the background. My solution suggests fixing this problem by resetting the Surface on Ogre with Java onSurfaceChanged.

@Override
public void onSurfaceChanged(GL10 gl, int width, int height) 
{

	if (JNI != null) 
	{
	    lastSurface = mGlSurfaceView.getHolder().getSurface();
	    if (lastSurface.isValid()) 
	    {
		JNI.changeSurface(lastSurface);
	    }
	}
}

my.cpp
void changeSurface(ANativeWindow *window) 
{
   mRenderWindow->_changeSurface(window);
}

OgreRenderWindow.h
virtual void _changeSurface(void* nativeWindow) = 0;

OgreAndroidEGLWindow.h
void _changeSurface(void* window);

OgreAndroidEGLWindow.cpp
void AndroidEGLWindow::_changeSurface(void* window)
{
	mWindow = reinterpret_cast<EGLNativeWindowType>(window);
	mContext->changeCurrent();
}

OgreEGLContext.h
void changeCurrent();

void EGLContext::changeCurrent()
{
   mContext = eglGetCurrentContext();
   EGL_CHECK_ERROR
}

[paroj]

does calling _notifySurfaceDestroyed & _notifySurfaceCreated also work?

[luorentong]

miscParams ["externalGLControl"] = "true" ,I tested that using _notifySurfaceCreated() would cause problems because createSurfaceFromWindow(), using the eglCreateWindowSurface method.

[paroj]

there is the mIsExternal flag, which you can use to call eglGetCurrentSurface instead of createSurfaceFromWindow

[paroj]

fixed in latest 1.12