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Created attachment 2650 [details]
described in the comment

First I create a window with only (SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL) and create the GL context. After that i issue a few OpenGL commands (glViewport, glClearColor, ...) and enter the render loop. Inside the loop I first check for the F key press which toggles the fullscreen mode then continues to render the triangle and swap the buffers.

Then i hit F once to enter fullscreen mode and heres the problem now: when i hit F again to leave fullscreen mode the OpenGL viewport will be displaced to the top left corner as if there was no title bar nor border. I will attach the same exact code I'm running with a Screenshot showing the window at startup and the window after the fullscreen toggling. I'm using Visual Studio 2015 Community.